Transport Air Conditioning
INSTALLATION PROCEDURES
for
SPLIT SYSTEMS
Generation 4 & 5
T--311 Rev B Change 06/10
INSTALLATION
MANUAL
SPLIT--SYSTEMS
GEN 4 & 5
POLICY AND PROCEDURES
SAFETY SUMMARY
GENERAL SAFETY NOTICES
The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this
manual. They are recommended precautions that must be understood and applied during installation, operation,
service, and maintenance of the equipment covered herein. The general safety notices are presented in the following
three sections labeled: First Aid, Operating Precautions and Installation Precautions. A listing of the specific warnings
and cautions appearing elsewhere in the manual follows the general safety notices.
FIRST AID
An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention immediately.
OPERATING PRECAUTIONS
Always wear protective eye wear (safety glasses or goggles).
Keep hands, clothing and tools clear of the evaporator and condenser fans.
No work should be performed on the system unless battery power is disconnected.
Always work in pairs. Never work on the equipment alone.
In case of severe vibration or unusual noise, stop the system and investigate.
When vehicle engine is running, keep your hands, clothing and tools clear of the engine fan blade and drive belts.
INSTALLATION PRECAUTIONS
Familiarize yourself with the proper operation of any service equipment you will be using (voltmeter, amp probe,
manifold gauges, etc.). Always read the owner’s manual that is enclosed with the equipment
Always follow the manufacturers instructions for your recovery/recycling equipment. Failure to do so could cause
personal injury or damage to your equipment. Never perform any maintenance or service on your equipment before
consulting with authorized service personnel. Always unplug unit before attempting any maintenance. Removing
internal fittings and filters can release pressurized refrigerant. Slowly release pressure and always wear appropriate
safety wear.
Avoid breathing any refrigerant vapor, lubricant vapor, or mist. Exposure to these, particularly PAG oil mist, may irritate
your eyes, nose, or throat.
Always use a DOT (Department of Transportation) approved cylinder for storing used and recycled refrigerant.
Approved cylinders will be stamped DOT 4BW or DOT 4BA. Carrier recommends a MACS (Mobile Air Conditioning
Society) certification in Recovery/Recycling to gain more information on handling and using refrigerants.
Never attempt to apply heat or open flame to a refrigerant cylinder. High temperatures can raise the cylinder pressure
to dangerous levels. Carrier recommends using a heat blanket to increase the internal temperature of the refrigerant
cylinder, greatly increasing the rate of transfer of refrigerant to the bus air conditioning system.
Never use compressed air (shop-air) to leak-test or pressure test a R134a system. Under certain conditions,
pressurized mixtures of R134a and air can be combustible. In addition, shop air will inject moisture into the system.
Always use mineral oil to lubricate “O” Rings, hoses and fittings on R134a systems. PAG oils will absorb moisture and
become very acidic and corrosive. Mineral oil will not absorb moisture and thus prevent corrosion. Always wear gloves
when working with PAG and Ester lubricants to prevent irritation to your skin. R134a lubricants can also damage
vehicles paint, plastic parts, engine drive belts and coolant hoses.
Beware of unannounced starting of the evaporator and condenser fans. Do not remove the evaporator cover or
condenser fan guards without disconnecting the vehicle battery cable.
Always wear gloves when handling evaporators and condensers.
Be sure power is turned off before working on motors, controllers, and electrical control switches. Tag system controls
and vehicle battery to prevent accidental energizing of the system.
Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems with
the system should be diagnosed, and any necessary repairs performed, by qualified service personnel.
When performing any arc welding on the vehicle, disconnect the vehicle battery.
In case of electrical fire, extinguish with CO2 (never use water). Disconnect vehicle battery power if possible.
Never route hoses or electrical harnesses down the front of the bus on the driver’s side when installing a front mounted
evaporator assembly. Driver visibility could be impaired.
Before drilling holes for routing hoses and harnesses through the bus floor or wall, make sure there are no electrical
harnesses, floor braces, tubing, etc. in the path of the holes to be drilled. Drilling into an electrical harness or fuel line
could cause a fire or explosion.
Safety --i
T--311
SPECIFIC WARNINGS AND CAUTIONS
WARNING
Do not attempt to modify the EM-3 evaporator top panel. Modifications to the top panel could structurally weaken the evaporator assembly, causing system failures and/or injuries to passengers.
WARNING
Do not use a nitrogen cylinder without a pressure regulator
WARNING
Never use air for leak testing. It has been determined that pressurized, air-rich mixtures of refrigerants and air can undergo combustion when exposed to an ignition source.
CAUTION
When installing a GEN-5 evaporator assembly, never push against the blower wheel. It can easily be
knocked out of balance. Hold unit up to the ceiling with the evaporator framing, not the blower wheel.
CAUTION
Failure to seal these noise abatement headliners (perforated) will allow dissipation of the air and
marginal cooling.
CAUTION
Use of substitute hardware or failure to follow the installation instructions may result in structural
fatigue and/or breakage.
CAUTION
When installing any GEN 5 Evaporator assembly, be very careful not to push against the blower
wheel (s). The blower wheel can easily be distorted and will have to be replaced.
CAUTION
When selecting a location for installing the evaporator it is highly recommended that two roof bows
are used to secure the mounting rails.
CAUTION
When installing any IW unit, be careful not to cut the bus structure rails or wiring harnesses.
T--311
Safety --ii
CAUTION
Because of the limited access to the block valve, start the fittings by hand (finger tightening) making
sure that there is no cross-threading before tightening. When tightening the fittings, make sure that
the Block Valve does not move.
CAUTION
Never route refrigerant hose, electrical cable or drain lines in any location where driver’s visibality
would be impaired.
CAUTION
When marking the cut-out for a front mounted In-Wall be very careful not to cut too much off the top
radii.
CAUTION
When removing any electrical item involving multiple plugs/sockets it is recommended that you
mark both sides of the plug/socket arrangement. This way you will not have to guess what goes
where when re-connecting.
CAUTION
Because of the limited access to the block valve, start the fittings by hand (finger tightening) making
sure that there is no cross-threading before tightening. When tightening the fittings, make sure that
the Block Valve does not move.
CAUTION
Never tie-wrap or secure in any way, refrigerant hose or electrical cable to any part that may move
during the normal operation of the vehicle. Always use insulated clamps to secure to the bus wall.
(See Figure 2-53 & Figure 2-54)
CAUTION
Make sure there is nothing installed where you are going to drill through the bus floor.
CAUTION
The Rooftop Condenser assembly must contact the bus roof in the center. If not, damage will occur.
Consult factory as optional mounting may be required.
CAUTION
All 3/16 and 1/4 In. rivet engagement thickness (grip range) must be between 0.080 and 0.625. Using
rivets other than those specified may allow the condenser assembly to come loose from the bus roof.
Safety --iii
T--311
CAUTION
Condenser assemblies must be properly installed using graded hardware. The CM-2 condenser assembly requires at least 4 bolts and the CM-3 requires at least 6 bolts.
CAUTION
When drilling into the vehicle wall, always use a drill stop to help protect against damaging any wiring that might be located behind the wall.
CAUTION
Never substitute fittings or hose. Follow the piping diagram provided with the system.
CAUTION
Never substitute fittings or hose. Follow the piping diagram provided with the system.
CAUTION
No matter what type of lubricant (oil) used in the system, always use mineral oil to lubricate the ORings, and fittings. PAG oils will absorb moisture and become very acidic and corrosive. Mineral oil
will not absorb moisture and thus prevent corrosion.
CAUTION
Always use existing holes in the chassis frame. Never drill holes in the chassis frame.
CAUTION
Tie-Wraps may be used to bundle hoses and harnesses, but should never be used to secure hoses to
the vehicle.
CAUTION
Verify that the oil added to the air conditioning system is the same oil that is in the compressor. The
mixing of incompatible oils will damage your system.
T--311
Safety --iv
TABLE OF CONTENTS
Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFIC WARNINGS AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 WHAT IS AIR CONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 SYSTEM NOMENCLATURE DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1 Model And Serial Number Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2 System Requirements Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 COOLING CYCLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 CONDENSERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8 PRE-INSTALLATION INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3 Cap Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.4 Blower Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.5 Aesthetics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.6 Mounting (Front & Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.7 Mounting (Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.8 In-Wall Evaporators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.9 Drain Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.10 Ducted Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.11 Bus Headliners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.12 Mounting Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 REAR MOUNTED EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 GEN 4/5 Series EM-1, EM-2, EM-3, EM-7, EM-6, & EM-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Luggage Compartment Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3 EM-3 EVAPORATOR GEN 4 OR GEN 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 SIDE MOUNTED EVAPORATOR - EM-1, EM-2, EM-6, EM-7, & EM-14 . . . . . . . . . . . . . . . . . . . . . .
2.4 EM-9 DUCTED EVAPORATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 EM-17 EVAPORATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 IW-1, IW-2, & IW-14 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.1 Rear Mounted In-Wall Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.2 Front Mounted In-Wall Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.3 In-Wall Evaporator - TBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 EM-20, EM-21 & EM-22 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 EM-23 COOL/HEAT EVAPORATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
i
ii
1-1
1-1
1-1
1-1
1-1
1-1
1-5
1-6
1-7
1-8
1-9
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-7
2-8
2-9
2-12
2-15
2-16
2-16
2-21
2-24
2-24
2-24
T-311
TABLE OF CONTENTS - Continued:
Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
CONDENSERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3 Cap Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.4 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.5 Obstructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.6 Skirt Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.7 Mounting (Skirt) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.8 Mounting (Rooftop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.9 Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 CONDENSERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 CM-2, CM-3, CM-4, CM-5, & CM-14 SKIRTMOUNTED CONDENSER ASSEMBLIES . . . . . . . . . .
3.3.1 SKIRT--MOUNTED INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 CM-5 CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 KR-4 ROOFTOP CONDENSER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1 ROOFTOP CONDENSER INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 KR2 & KR3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.1 Connecting To Side-Mounted Evaporators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 CM-2 AND CM-3 STACKED CONDENSER ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOSE ROUTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.1 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.2 Service Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.3 Dual Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.4 Connection Lubrication (Mineral Oil) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 QUICK-CLICK RESUABLE HOSE & FITTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1 Assembly Instructions For Quick--Click
Resuable Hose & Fitting Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2 Barrier Type Hose & Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 EVAPORATOR HOSE ROUTING-INSIDE THE BUS WALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 EVAPORATOR HOSE ROUTING, OUTSIDE THE BUS WALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 EVAPORATOR HOSE ROUTING, SIDE-MOUNTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 CHASSIS HOSE ROUTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7 CONDENSER HOSE ROUTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8 VEHICLE COMPRESSOR HOSE ROUTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9 TORQUE SPECIFICATIONS - REFRIGERANT FITTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.10 ROOFTOP CONDENSER HOSE ROUTING
(CM-7 & CM-11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.11 AUXILIARY HEATER HOSE ROUTING
(GENERIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.12 PIPING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T-311
ii
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-5
3-6
3-6
3-9
3-9
3-10
4-1
4-1
4-1
4-1
4-1
4-1
4-1
4-1
4-2
4-2
4-6
4-7
4-8
4-9
4-10
4-11
4-11
4-11
4-11
TABLE OF CONTENTS - Continued:
Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 SYSTEM WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.1 Electrical Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.2 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.3 Dual Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 VOLTAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Component Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.1 Evaporator Chassis Ground, Gen 4 (Excel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.2 Evaporator Chassis Ground, Gen 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.1 Manual controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.2 Electrical Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.3 Electrical Control Panel - Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6 TOTAL CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6.1 Total Control Electrical Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7 OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MOUNT KITS AND COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.1 Torque Specifications - Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.2 Torque Specifications - Split System ELectrical Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 DRIVE BELT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.2 Belt Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.3 Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.5 Measuring Methods for Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 COMPRESSOR INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.1 Installation Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.2 Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.3 Mounting Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.4 Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVACUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 REFRIGERANT SERVICE TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.1 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.2 Procedure - Complete system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 INSTALLING MANIFOLD GAUGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHARGING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 . INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1 . Proper R134a Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.2 . Proper Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.3 . Liquid Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.4 . PAG And POE Oils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.5 . Evaporator Tie-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.6 . Adding Refrigerant to System (Full Charge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-1
5-2
5-2
5-2
5-3
5-4
5-5
5-5
5-6
6-1
6-1
6-1
6-2
6-2
6-2
6-2
6-3
6-4
6-4
6-4
6-4
6-4
6-5
7-1
7-1
7-1
7-1
7-1
7-2
8-1
8-1
8-1
8-1
8-1
8-1
8-2
8-3
T-311
TABLE OF CONTENTS - Continued:
Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
LEAK CHECKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1
9-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.1 Micron (Vacuum) Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-1
9-1
9.1.2 Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-1
REFRIGERANT LEAK CHECKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-1
WARRANTY REGISTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.2 PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.2.1 Authorized Carrier Transport A/C Dealers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.2.2 Consumers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10-1
10.2.3 Paper Registration (Obsolete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.3 WARRANTY POLICY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.3.1 In-Line Failures - OEM/Installer Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
FINAL (CHECK-OUT SHEET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11-1
9.2
INSTALLATION CHECK-OUT
.....
11-1
11.1 SYSTEM REQUIREMENTS LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11-5
11.1.1 System Requirement Label Completion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11-5
LIST OF ILLUSTRATIONS
Figure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
Figure 1-1 Condenser Model CM2/3 - Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2
Figure 1-2 GEN 4 Evaporator Model - Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2
Figure 1-3 GEN 5 Evaporator Model (All) - Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
Figure 1-4 GEN 4, IW-2 & IW-7 - Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
Figure 1-5 GEN 4, IW-1 - Serial Number Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
Figure 1-6 CM-7/11 Rooftop Condensers (No Longer Offered) - Serial Number Location . . . . . . . . . . . . . . .
1-4
Figure 1-7 KR-2/KR-3 Rooftop Condensers - Serial Number/PID Location . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1-8 KR-4 Rooftop Condenser - Serial Number/PID Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4
1-4
Figure 1-9 Typical Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5
Figure 1-10 Refrigerant Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6
Figure 2-1 Template For EM-1 And EM-2 (GEN 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2
Figure 2-2 Measurement To Wall (GEN 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
Figure 2-3 Measurement To Wall (GEN 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-4 7/16 Inch Holes in Bus Roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
2-3
Figure 2-5 Carriage Bolts & Sealant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
Figure 2-6 Sealant Pattern on Mounting Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3
Figure 2-7 Carriage Bolt Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
Figure 2-8 Locking Pliers Clamped to Carriage Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
Figure 2-9 Locking Pliers & GEN 4 Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
Figure 2-10 Evaporator Mounted to Flat Ceiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-11 Mounting Channel Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
2-4
Figure 2-12 Block Valve Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5
Figure 2-13 Drain line & Condensate Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5
T-311
iv
LIST OF ILLUSTRATIONS
Figure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
Figure 2-14 Installed GEN 4 Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-15 Return Air Grill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-16 Painted Mounting Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5
2-5
2-5
Figure 2-17 GEN-4/5 Front/Rear (EM-1, 2, 6, & 14) Evaporator & Installation Hardware . . . . . . . . . . . . . . . .
Figure 2-18 Rear Mount Evaporator (GEN 4) - Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6
2-6
Figure 2-19 Rear Mount Evaporator (GEN-5) - Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-20 EM-6 (GEN 4) Rear Mounted In An Extended Roof Van . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-21 EM-3 Installation Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7
2-7
2-8
Figure 2-22 Side-Mount Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-23 Drain Line Elbows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9
2-9
Figure 2-24 Side Mount Installation Instructions (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-25 Side Mounted Evaporator GEN 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-26 EM-2 (Gen V) Side-Mount - Free Blow, Installed (Complete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10
2-10
2-11
Figure 2-27 EM-9 Ducted Evaporator - Hose & Harness Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-28 Punching out Louver Holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-12
2-13
Figure 2-29 End Cap With Louver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-13
Figure 2-30 EM-9 Ducted Evaporator - Location - Completed Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-31 School Style Ducting-Passenger Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-13
2-13
Figure 2-32 School Style Ducting-Drivers Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-33 Side Mounted Hose Routing
(Using 455 Angles) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-34 Side Mounted Hose Routing (Straight) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-13
2-14
2-14
Figure 2-35 EM-17 Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-36 In-Wall Marked For Cut-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-37 In-Wall Cut-Out (Panel Removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-15
2-16
2-17
Figure 2-38 In-Wall Cut-Out (Insulation Removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-39 In-Wall Cut-Out (Wires Supported) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-17
2-17
Figure 2-40 Bus Electrical Harness Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-41 In-Wall Hose/Drain Line Cut-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-42 In-Wall Hose Cover Back . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-18
2-18
2-18
Figure 2-43 Bus Light Removed For Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-44 Hose/Harnes/Drain Routed To IW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-18
2-19
Figure 2-45 IN-Wall Installed (Left-Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-46 In-Wall Installed (Right-Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-47 Hose Cover Installed (Left-Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-19
2-19
2-20
Figure 2-48 In-Wall With Trimmed Cover (Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-49 Front In-Wall Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-20
2-21
Figure 2-50 Hose/Harness/Drain Line Routing & Access Cut-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-51 In-Wall Front Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-52 In-Wall Installed (Front Mount) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21
2-21
2-22
Figure 2-53 Hose Routed Over Door (Closeup) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-54 Hose Routed Over Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-22
2-22
Figure 2-55 In-Wall With Trimmed Cover (Front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2-56 In-Wall Cover - Locking Tabs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-23
2-23
v
T-311
LIST OF ILLUSTRATIONS
Figure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
Figure 2-57 In-Wall Cut-Out (TBB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-24
Figure 2-58 IW-1 Installed In TBB (Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-24
Figure 2-59 IW-1 Secured To Structure Rail TBB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-24
Figure 3-1 3/8 Inch Carriage Bolts Thru Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3
Figure 3-2 Condenser Mounted With Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3
Figure 3-3 Installation Drawing (Typical Skirt Mounted) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4
Figure 3-4 CM-2 With Chassis Mounted Grill On An Extended Roof Van (Custom) . . . . . . . . . . . . . . . . . . . .
3-4
Figure 3-5 CM-3 With Chassis Mounted Grill In A Cut-A-Way Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5
Figure 3-6 CM-5 Installation Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5
Figure 3-7 Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7
Figure 3-8 KR4 Condenser Mounted Without Mounting Channels (Front/Back View) . . . . . . . . . . . . . . . . . . .
3-7
Figure 3-9 KR4 Condenser Mounted With Mounting Channels (Front/Back View) . . . . . . . . . . . . . . . . . . . . .
3-7
Figure 3-10 KR4 Condenser Mounted Without Mounting Channels (Side View) . . . . . . . . . . . . . . . . . . . . . . .
3-7
Figure 3-11 KR4 Condenser Mounted With Mounting Channels (Side View) . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8
Figure 3-12 Condenser Feed-Thru Plate KR4 (Single Loop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8
Figure 3-13 Condenser Feed-Thru Plate KR4 (Dual Loop) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8
Figure 3-14 Condenser Feed-Thru Plate KR2/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9
Figure 3-15 Condenser Feed-Thru Plate KR2/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9
Figure 3-16 Stacked Condenser Assembly (Side View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11
Figure 3-17 Stacked Condenser Assembly (Bus Skirt View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11
Figure 4--1 Quick--Click #1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
Figure 4--2 Quick--Click #2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
Figure 4--3 Quick--Click #3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
Figure 4--4 Quick--Click #4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2
Figure 4--5 Quick-Click Hose (Capped) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2
Figure 4--6 Bus With Rear Seat Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2
Figure 4--7 Hose Back Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3
Figure 4--8 Hole-Saw Cuts in Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3
Figure 4--9 Hole-Saw Cuts Joined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3
Figure 4--10 Rear Wall Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3
Figure 4--11 Hose Cover Back . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4
Figure 4--12 Hose Cover Backs On Rear Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4
Figure 4--13 Access Hole With Trim-Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4
Figure 4--14 Hoses Routed Through Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4
Figure 4--15 Hoses Routed Through Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5
Figure 4--16 Incorrect Hose/Harness Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5
Figure 4--17 Correct Hose/Harness Corner Routing (Window Not Blocked) . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6
Figure 4--18 Side-Mounted Routing (Top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6
Figure 4--19 Hose/Harness/Drain Line Tie-Wraped To Hose Cover Backs . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6
Figure 4--20 Hose/Harness Clamped to Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6
Figure 4--21 Metal Hose Cover Backs W/Tie-Wraps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
Figure 4--22 Side-Mounted Hose/Harness Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8
T-311
vi
LIST OF ILLUSTRATIONS
Figure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
Figure 4--23 Hose Routing (Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
Figure 4--24 Hose Routing (Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
Figure 4--25 Hose Routing (Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
Figure 4--26 Hose Routing (Chassis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
Figure 4--27 Hose Routing (Chassis & Condenser) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9
Figure 4--28 Engine Routing (With High & Low In-Line Access Fittings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-10
Figure 4--29 Hose Routing - OEM (To & From Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-10
Figure 4-22 Rear Evaporator, OEM Tie-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4--12
Figure 4-23 Evaporator, Skirt Monuted Condenser and Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4--13
Figure 4-24 Evaporator, Skirt Monuted Condenser and Compressor (AC-322, -332, -442) . . . . . . . . . . . . . .
4--14
Figure 4-25 Evaporator, Skirt Monuted Condenser Compressor and Aftermarket InDash (AC-4431) . . . . .
4--15
Figure 4-26 EM-3 Evaporator, (2) Skirt Monuted Condensers and TM-31 Compressor (AC-882, -883) . . .
4--16
Figure 4-27 (1)EM-3 Evap, (1)EM-7 Evap, (2) Skirt Condensers and a TM-31 Compressor (AC-9632) . . .
4--17
Figure 5-1 Harness & Pig-Tail Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1
Figure 5-2 Grounded to Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2
Figure 5-3 Grounded to Chassis Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2
Figure 5-4 Drivers Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2
Figure 5-5 Controls Mounted Without Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2
Figure 5-6 Drivers Control Panel (Dual Systems) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3
Figure 5-7 Electrical Control Panel (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3
Figure 5-8 Electrical Control Cables Thru Fire Wall To Electrical Control Panel . . . . . . . . . . . . . . . . . . . . . . . .
5-3
Figure 5-9 Relay Boards Installed Inside Bus (Dual System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4
Figure 5-10 Wired Relay Boards (Dual System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4
Figure 5-11 Relay Boards Inside Dash Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4
Figure 5-12 Total Control Key Pad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-5
Figure 5-13 Total Control Electrical Panel (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-5
Figure 5-14 Gen 5 Total Control (Dual System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6
Figure 6-1 Metric Torque Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
Figure 6-2 Metric Bolt Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
Figure 6-3 U.S.S. Torque Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
Figure 6-4 U.S.S. Bolt Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
Figure 6-5 Belt Clearance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3
Figure 6-6 Belt Misalignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3
Figure 6-7 Straight-Edge Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3
Figure 6-8 Belt Tension Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4
Figure 6-9 Compressor Mounting Angles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-5
Figure 7-1 Manifold Gauge Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2
Figure 7-2 Refrigerant Service Connections (Split Systems) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3
Figure 1-11 Micro-Channel Style Condenser Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2
Figure 9-1 Refrigerant Service Connections (Split Systems) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-2
Figure 10-1 Warranty Registration Card (Obsolete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
Figure 11-1 System Requirements Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11-5
vii
T-311
LIST OF TABLES
Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
Table 1-1 ADDITIONAL SUPPORT MANUALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-2 CARRIER TRANSPORT AIR CONDITIONING SYSTEMS (GEN 4/5) . . . . . . . . . . . . . . . . . . . . . . .
Table 1-3 GEN 4 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-4 GEN 5 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-5 GEN 5 EVAPORATORS -- VARIABLE SPEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-6 IN--WALL EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1-7 CONDENSERS (Used With GEN 4 Or GEN 5 Series Evaporators) . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-1 GEN 4 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
1-7
1-7
1-8
1-8
1-8
2-2
Table 2-2 GEN 5 EVAPORATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-3 DISTANCE TO BACK WALL (GEN 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-4 DISTANCE TO BACK WALL (GEN 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-5 IW-1 EVAPORATOR DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-6 IW-2 EVAPORATOR DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2-7 IW-14 EVAPORATOR DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-1 CONDENSERS (Used With GEN 4 And GEN 5 Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-2 SKIRT MOUNTED COND. DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3-3 ROOF--MOUNT COND. DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 8-1 SPLIT SYSTEM REFRIGERANT AND OIL CHARGING TABLE (THROUGH GEN 4) . . . . . . . . . .
Table 8-2 SPLIT SYSTEM REFRIGERANT AND OIL CHARGING TABLE (GEN--5) . . . . . . . . . . . . . . . . . . . .
Table 8-3 SPLIT--SYSTEM GEN--5 WITH MICRO--CHANNEL CONDENSER . . . . . . . . . . . . . . . . . . . . . . . . .
Table 8-4 COMP. OIL TYPE & PART NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 8-5 CARRIER TRANSPORT AIR CONDITIONING SYSTEM PERFORMANCE CHART . . . . . . . . . . .
2-2
2-3
2-3
2-16
2-16
2-16
3-2
3-2
3-6
8-1
8-2
8-2
8-3
8-4
T-311
viii
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
This manual contains instructions for the proper
preparation of and installation of Carrier Transport Air
Conditioning split systems. This manual does not
replace proper training and/or certification required by
the EPA or other local agencies.
The purpose of this manual is to assist you in completing
a quality, trouble-free installation which will compliment
a quality product, and ensure optimum system
performance for the life of the vehicle.
The first number after the letters “AC” or “DC” is the
capacity of the system in BTU”s to the nearest 10
thousand. (Example - 26,000 BTU’s would be rounded
off to 30,000 BTU’s, or the number 3.)
When only three numbers are in the designation, the
second number is the evaporator and the third number
is the condenser. (Example - AC-512 = AC designates a
free-blow system, 5 means approximately 50,000 BTU,
1 is an EM-1 evaporator assembly, while the 2
designates a CM-2 condenser assembly).
While this manual does not cover all combinations,
variations, and details, it does set up standards from
which installation processes can be measured.
When more than three digits are in the model number,
the second, third and potentially the forth numbers
designate the evaporator(s) assembly. The last two
numbers designate the condenser assemblies.
Common sense and care for quality will result in
superior installations and customer satisfaction.
1.3.1 Model And Serial Number Tags
A Split System normally includes an evaporator(s), a
condenser(s) a compressor(s) and interconnecting
refrigerant hoses, fittings, and electrical harnesses and
controls. Refer to Table 1-3 through Table 1-6 for
evaporator models and Table 1-7 for condenser
models. Table 1-2 shows popular system designations.
Additional support manuals are listed in Table 1-1.
When in doubt about a particular installation or if you
require additional information, do not hesitate to call the
Carrier Transport Air Conditioning Technical Service
Hot Line for assistance (1--800-450-2211).
1.2 WHAT IS AIR CONDITIONING
Air Conditioning is the cooling, dehumidification, and
filtration of the air located within the passenger
compartment of your vehicle.
In order to identify the air conditioning system you are
installing, you will need to know the model number and
serial number. All Carrier Transport Air Conditioning
system components have a model and serial number
data tag, with bar code (since 2002), located on each
evaporator and condenser assembly. See Figure 1-1
for skirt mounted condenser data tag location,
Figure 1-2 for GEN 4 evaporator data tag location,
Figure 1-3 for GEN 5 evaporator data tag location and
Figure 1-6 for the CM-7 & CM-11 rooftop condensers
(no longer offered) data tag location. Figure 1-4 &
Figure 1-5 shows the location of the data tags for
In--Wall evaporator assemblies. Figure 1--7 shows the
KR--2/3 rooftop condenser PID tag location and
Figure 1-8 shows the PID data tag location for KR--4
condensers. Knowing these locations and the
information on these data tags will aid you in completing
the On--Line Warranty Registration (refer to Section 10),
and if needed, ordering the correct replacement parts.
1.3 SYSTEM NOMENCLATURE DESIGNATIONS
All Carrier Transport Air Conditioning split system
applications will have system numbers consisting of 2
letters followed by 3 or more numbers (ie. AC-512),
identifying them as a free blow or ducted system,
approximate BTU rating, type of evaporator assembly
and type of condenser assembly.
The letter “A” from the letters “AC” means this systems
evaporator(s) are free blow units.
The letter “D” from the letters “DC” means this systems
evaporator(s) are corner ducted.
NOTE
The EM-9 evaporator data tag is located on the
side of the evaporator assembly, not between
the blower assemblies (See Figure 1-2).
1.3.2 System Requirements Label
The system requirements label (See Figure 11-1) is
filled out after the installation and is affixed as close to
the vehicle compressor as possible. Refer to paragraph
11.1 for instruction on completing the system
requirements label.
Table 1-1 ADDITIONAL SUPPORT MANUALS
MANUAL NUMBER
EQUIPMENT COVERED
TYPE OF MANUAL
T-299
Split Systems
Operation & Service
T-299PL
Split Systems
Parts List
62-10686
Split Systems
Installation Video
62-50471
Transport Refrigeration
Service Training
62-03213
Service Tools
Service Tools
62-02737
Transport Air Conditioning
Warranty Policy & Procedures
Change 07/09
1--1
T--311
SYSTEM
AC-3140
AC-360
AC-3142
AC-362
AC-422
AC-512
AC-513
AC-633
AC-8322
AC-82222
AC-91223
AC-11122
DC-19922
AC-11133
DC-19933
AC-16333
DC-12175
Table 1-2 CARRIER TRANSPORT AIR CONDITIONING SYSTEMS (GEN 4/5)
TYPE
BTU
EVAP (S)
COND (S)
COMP (S)
FB
26,000
(1) EM-14
OEM
OEM
FB
30,000
(1) EM-6
OEM
OEM
FB
26,000
(1) EM-14
(1) CM-2
(1) 10 CID
FB
30,000
(1) EM-6
(1) CM-2
(1) 10 CID
FB
40,000
(1) EM-2
(1) CM-2
(1) 10 CID
FB
48,000
(1) EM-1
(1) CM-2
(1) 10 CID
FB
52,000
(1) EM-1
(1) CM-3
(1) 10 CID
FB
60,000
(1) EM-3
(1) CM-3
(1) 12.6 CID
FB
78,000
(1) EM-3
(2) CM-2
(2) 10 CID
FB
80,000
(2) EM-2
(2) CM-2
(2) 10 CID
FB
92,000
(1) EM-1, (1) EM-2
(1) CM-2, (1) CM-3
(2) 10 CID
FB
96,000
(2) EM-1
(2) CM-2
(2) 10 CID
CD
96,000
(2) EM-9
(2) CM-2
(2) 10 CID
FB
104,000
(2) EM-1
(2) CM-3
(2) 10 CID
CD
104,000
(2) EM-9
(2) CM-3
(2) 10 CID
FB
108,000
(1) EM-3, (1) EM-6
(2) CM-3
(2) 10 CID
CD
120.000
(1) EM-17
(1) CM-5
(1) 05K or 05G
LEGEND:
FB = Free Blow
CD = Corner Ducted
EM = Evaporator Module
CM = Condenser Module
CID = Cubic Inch Displacemrnt
Figure 1-1 Condenser Model CM2/3 - Serial Number Location
EM-9 Location
Figure 1-2 GEN 4 Evaporator Model - Serial Number Location
T--311
1--2
Figure 1-3 GEN 5 Evaporator Model (All) - Serial Number Location
2
5
Figure 1-4 GEN 4, IW-2 & IW-7 - Serial Number Location
Figure 1-5 GEN 4, IW-1 - Serial Number Location
1--3
T--311
Obsolete Tag
Figure 1-6 CM-7/11 Rooftop Condensers (No Longer Offered) - Serial Number Location
Figure 1-7 KR-2/KR-3 Rooftop Condensers - Serial Number/PID Location
PID
Serial/ModelNumber Plate
Figure 1-8 KR-4 Rooftop Condenser - Serial Number/PID Location
T--311
1--4
from the refrigerant. The receiver/drier also stores liquid
refrigerant (See Figure 1-9).
1.4 SYSTEM COMPONENTS
1. Thermostat - A thermostat is a temperature
sensitive device, which when activated, signals the
electro-magnetic clutch to engage.
2. Electro-Magnetic Clutch - The electro-magnetic
clutch controls the operation of the compressor. When
engaged, the compressor circulates refrigerant and
provides cooling (See Figure 1-9).
3. Compressor - The compressor is a belt driven,
high-pressure pump, which circulates the refrigerant
through the evaporator and condenser (See
Figure 1-9). The operation of the compressor is
controlled by the electro-magnetic clutch, which in turn
is controlled by the thermostat.
4. Condenser - The condenser is normally located in
the skirt or on the roof of the bus (vehicle), (See
Figure 1-9). Its primary function is to reject heat, which
was transferred to the refrigerant by the evaporator from
the passenger compartment of the bus (vehicle).
5. Filter/Dryer & Receiver/Drier -- The filter/dryer and
receiver/drier removes moisture and particulate matter
6. Expansion Valve/Block Valve refrigerant flow into the evaporator coil.
Meters
the
7. Evaporator - The evaporator is located in the interior
of the bus (vehicle) (See Figure 1-9). Its primary
function is to transfer heat contained in the passenger
compartment air, into the refrigerant, which is circulated
by the compressor, through the evaporator coil. During
this process the air is also filtered and dehumidified
8. Refrigerant - A refrigerant is any material that
possesses high heat transfer capabilities. Its primary
function is to act as the medium for heat transfer, which
facilitates the movement of heat from the passenger
compartment to the outside air. Refrigerant under
varying pressures exists in different states, and
performs different heat transfer functions. Under low
pressure, refrigerant exists as a gas that can absorb
heat. under high pressure, refrigerant exists as a liquid
that can reject heat. The heat transfer properties
exhibited when refrigerant changes state is the
foundation of the refrigerant cycle.
Cool Air Out
6
7
4
5
1
1.
2.
3.
4.
2
Ambient Air In
3
Compressor
Discharge Line (hot gas)
Condenser
Liquid Line
5.
6.
7.
Filter--Drier or Receiver--Drier
Evaporator
Suction Line
Figure 1-9 Typical Component Locations
1--5
T--311
1.5 COOLING CYCLE
The unit operates as a vapor compression system using
R-134a as the refrigerant (See Figure 1-10). The
compressor raises the pressure and the temperature of
the refrigerant and forces it thru the discharge lines into
the condenser tubes. The condenser fan circulates
surrounding air (which is at a temperature lower than the
refrigerant) over the outside of the condenser tubes.
Heat transfer is established from the refrigerant (inside
the tubes) to the condenser air (flowing over the tubes).
The condenser tubes have fins designed to improve the
transfer of heat from the refrigerant gas to the air; this
removal of heat causes the refrigerant to liquify. Liquid
refrigerant leaves the condenser and flows to the filter/
drier (receiver/drier). The filter/drier (receiver/drier)
contains a medium (absorbent) that keeps the
refrigerant clean and dry.
From the filter-drier (receiver/drier), the liquid refrigerant
9
then flows to the block type expansion valve. The
expansion valve reduces pressure and temperature of
the liquid and meters the flow of liquid refrigerant to the
evaporator to obtain maximum use of the evaporator
heat transfer surface.
The low pressure, low temperature liquid that flows into
the evaporator tubes is colder than the air that is
circulated over the evaporator tubes by the evaporator
fans. Heat transfer is established from the evaporator
air (flowing over the tubes) to the refrigerant (flowing
inside the tubes). The evaporator tubes have fins to
increase heat transfer from the air to the refrigerant;
therefore the cooler air is circulated to the interior of the
vehicle.
The transfer of heat from the air to the low temperature
liquid refrigerant in the evaporator causes the liquid to
vaporize. This low temperature, low pressure vapor
refrigerant then continues through the suction line and
returns to the compressor where the cycle repeats.
8
7
Cool Air Out
Air In
6
10
4
5
Ambient Air In
3
2
1
1.
2.
3.
4.
5.
NOTE: Receiver--Drier will have HPS
installed with Micro--Channel Condensers
Compressor
Electro-Magnetic Clutch
Discharge Line
Condenser
Filter/Dryer or Receiver/Drier
6.
7.
8.
9.
10.
Liquid Line
Evaporator
Block Valve
Thermostat-(Freeze-Up)
Suction Line
Figure 1-10 Refrigerant Flow Diagram
T--311
1--6
interior or ducted to distribute the air in a planned
pattern, (the EM-20 is designed to sit on the vehicle’s
floor).
Evaporators are located in the interior of the vehicle.
Their primary function is to transfer heat contained in the
Refer to Table 1-3 (Gen 4) and Table 1-4 (Gen 5) for
passenger compartment into the refrigerant. The
Carrier Transport Air Conditioning evaporator
evaporators may be free blow mounted in the front, side
assemblies, their approximate CFM, Amp draw, weight,
or rear of the vehicle (bus) to blow directly into the
and cooling/heating BTU’s.
Table 1-3 GEN 4 EVAPORATORS
1.6 EVAPORATORS
EVAP.
CFM
EM-1
1330
EM-2
750
EM-3
2000
EM-6
525
EM-9
1330
EM-10
2060
EM-14
525
EM-17
2060
EM-20
425
EM-21
425
EM-22
525
EM-23
525
EVAP.
CFM
EM-1
1500
Amps (High Speed)
Amps (Med. Speed)
Amps (Low Speed)
18.5 @12.5V
19.4 @ 13.5V
12.7 @ 24.5
10 @12.5V
12 @13.5V
6.5 @ 24.5V
28.0@12.5V
30.0@13.5V
17.0@ 24.5V
9.4 @12.5V
10.6 @13.5V
7.0 @ 24.5V
32.0 @12.5V
33.2 @ 13.5V
N/A @ 24.5
57@25V
21 @12.5V
23 @ 13.5V
10 @ 24.5V
57 @25V
12 @12.5V
12 @25V
14.4 @12.5V
15.0 @ 13.5V
10.7 @ 24.5
8.0 @12.5V
9.0 @13.5V
6.0 @ 24.5V
22.0 @12.5V
25.0 @13.5V
14.0 @ 24.5V
7.5 @12.5V
8.4 @13.5V
6.0 @ 24.5V
15.0 @12.5V
18.0 @ 13.5V
N/A @ 24.5
57@25V
10.0 @12.5V
11.0 @ 13.5V
6.0 @ 24.5V
8.6 @12.5V
10.0 @ 13.5V
7.8 @ 24.5
5.0 @12.5V
6.0 @13.5V
4.5 @ 24.5V
11.0 @12.5V
12.0 @13.5V
6.0 @ 24.5V
4.6 @12.5V
5.1 @13.5V
4.0 @ 24.5V
8.1 @12.5V
10.3 @ 13.5V
N/A @ 24.5
57@25V
7.0 @12.5V
8.0 @ 13.5V
4.0 @ 24.5V
Weight
65 Lbs.
55 Lbs.
96 Lbs.
56 Lbs.
85 Lbs.
150 Lbs
35 Lbs.
196 Lbs.
30 Lbs.
12 @12.5V
20 @12.5V
12 @25V
32 Lbs.
40 Lbs.
20 @12.5V
12 @25V
40 Lbs.
Table 1-4 GEN 5 EVAPORATORS
Amps (High Speed)
Amps (Med. Speed)
25.6 @12.0 Volts
15.8 @12.0 Volts
27.3 @ 12.5 Volts
16.5 @ 12.5 Volts
29.5 @ 13.5 Volts
17.9 @ 13.5 Volts
N/A @ 24.5 Volts
N/A @ 24.5 Volts
Amps (Low Speed)
8.5 @12.0 Volts
8.9 @ 12.5 Volts
9.7 @ 13.5 Volts
N/A @ 24.5 Volts
Weight
60 Lbs.
EM-2
1200
21.5 @12.0 Volts
22.4 @ 12.5 Volts
24.3 @ 13.5 Volts
N/A @ 24.5 Volts
EM-3
2200
40.8 @12.0 Volts
42.5 @ 12.5 Volts
46.0 @ 13.5 Volts
N/A @ 24.5 Volts
28.6 @12.0 Volts
29.8 @ 12.5 Volts
32.2 @ 13.5 Volts
N/A @ 24.5 Volts
14.2 @12.0 Volts
14.8 @ 12.5 Volts
16.0 @ 13.5 Volts
N/A @ 24.5 Volts
90 Lbs.
800
14.5 @12.0 Volts
15.2 @ 12.5 Volts
15.9 @ 13.5 Volts
N/A @ 24.5 Volts
10.1 @12.0 Volts
10.6 @ 12.5 Volts
11.5 @ 13.5 Volts
N/A @ 24.5 Volts
6.1 @12.0 Volts
6.4 @ 12.5 Volts
7.0 @ 13.5 Volts
N/A @ 24.5 Volts
41 Lbs.
EM-7
11.8 @12.0 Volts
12.3 @ 12.5 Volts
13.3 @ 13.5 Volts
N/A @ 24.5 Volts
7.8 @12.0 Volts
8.1 @ 12.5 Volts
8.8 @ 13.5 Volts
N/A @ 24.5 Volts
49 Lbs.
1--7
T--311
EVAP.
CFM
EM-1
1500
EM-2
1200
EM-3
2200
EM-7
800
EVAP.
CFM
IW-1
585
IW-2
IW-7
IW-14
450
500
405
Table 1-5 GEN 5 EVAPORATORS -- VARIABLE SPEED
Amps (High Speed)
Variable Speed
29.5 @ 12.5 Volts
30.1 @ 13.5 Volts
16.0 @ 24.5 Volts
23.0 @ 12.5 Volts
24.3 @ 13.5 Volts
12.0 @ 24.5 Volts
46.0 @ 12.5 Volts
46.0 @ 13.5 Volts
24.0 @ 24.5 Volts
15.0 @ 12.5 Volts
15.9 @ 13.5 Volts
10.0 @ 24.5 Volts
Table 1-6 IN--WALL EVAPORATORS
Amps (High Speed)
Amps (Med. Speed)
24.0 @12.5V
12.3 @12.5V
25.4 @13.5V
12.9 @13.5V
21.7 @12.5V
11.3 @12.5V
15.0 @12.5V
24.0 @12.5V
18.0 @12.5V
24.0 @12.5V
Weight
60 Lbs.
49 Lbs.
90 Lbs.
41 Lbs.
Amps (Low Speed)
10.5 @12.5V
11.2 @13.5V
7.7 @12.5V
24.0 @12.5V
7.5 @12.5V
Weight
50 Lbs.
20 Lbs.
14 Lbs.
35 Lbs.
vehicle skirt or on the roof. If space in the vehicle skirt is
a problem, two (2) CM-2’s or two (2) CM-3’s can be
stacked on each other with a kit available from Carrier
Transport Air Conditioning. Carrier Transport Air
Conditioning condensers are listed in Table 1-7.
1.7 CONDENSERS
Condensers are normally located on the outside of the
vehicle. Their primary function is to reject heat absorbed
by the refrigerant from the passenger compartment to
the outside air. Condensers are normally located on the
Table 1-7 CONDENSERS (Used With GEN 4 Or GEN 5 Series Evaporators)
Component
Type
CFM (Approx)
CM-2
SKIRT MOUNTED
1600
CM-2 MICROCHANNEL
SKIRT MOUNTED
1600
CM-3
SKIRT MOUNTED
2400
CM-3 MICRO CHANNEL
SKIRT MOUNTED
2400
CM-4
CM-5
CM-7
No longer Available
SKIRT OR ROOF MT.
SKIRT MOUNTED
1300
6000
ROOF MOUNTED
1950
Amps
14 @12.5
16 @ 25V
14 @12.5
16 @ 25V
21 @12.5V
24 @ 25V
21 @12.5V
24 @ 25V
13 @12.5V
41 @ 24V
21 @12.5V
12 @ 25V
CM-11
No Longer Available
ROOF MOUNTED
1300
13 @12.5V
77 Lbs.
KR-4
ROOF MOUNTED
3500
44 @12.5V
22 @ 25V
187 Lbs.
KR-3
ROOF MOUNTED
2980
KR-2
ROOF MOUNTED
1990
CM-14
SKIRT MOUNTED
1800
CM-2 STKD (2 ea)
CM-3 STKD (2 ea)
SKIRT MOUNTED
SKIRT MOUNTED
3200
4800
T--311
1--8
21.0 @12.5V
24.0 @ 25V
12.0 @12.5V
15.0 @ 25V
27.5 @12.5V
30 @ 25V
30 @12.5V
45 @12.5V
Weight
66 Lbs.
45 Lbs.
76 Lbs.
59 Lbs.
59 Lbs.
202 Lbs.
87 Lbs.
95 Lbs.
70 Lbs.
92 Lbs.
144 Lbs.
168 Lbs.
1.8 PRE-INSTALLATION INSPECTION
Immediately upon receipt of your Carrier Transport Air
Conditioning system:
Check the number/amount of cartons and skids/pallets
against the shipping company’s “Bill of Lading” (B.O.L.).
Inspect all shipping cartons for any evidence of damage
in transit. If visible damage exists, indicate on “Bill of
lading” and initiate a claim directly with the transporting
company. All instances of visible damage or missing
cartons are the responsibility of the transporting
company.
Unpack and check components for hidden damage. If
hidden damage exists, initiate a claim directly with the
transporting company. All instances of hidden damage
are also the responsibility of the transporting company.
1--9
Check contents of cartons against the enclosed packing
lists. If any parts are missing, incomplete, or defective,
call Carrier Transport Air Conditioning customer service
for assistance.
Before installing any evaporator assembly, spin the
blower wheels by hand to insure they turn freely. It is
possible they could have been knocked out of alignment
during transit. This would be easy to correct before
installing.
Note
Before attempting to install any evaporator or
condenser always insure that each component
will fit in the location of choice.
T--311
SECTION 2
EVAPORATORS
2.1 INTRODUCTION
2.1.1 Description
Evaporators are located in the interior of the bus. Their
primary function is to transfer heat contained in the
passenger compartment into the refrigerant. The
evaporators may be free blow mounted in the front, side
or rear of the bus to blow directly into the interior or
ducted to distribute the air in a planned pattern.
2.1.2 Location
Before attempting to install any evaporator, always
insure that the evaporator will fit in the location of choice.
2.1.3 Cap Plugs
Carrier Transport Air Conditioning evaporators are
leak-checked at the factory then shipped with a small
charge of inert gas which keeps the coil free from
moisture. The evaporator caps/plugs must not be
removed until ready to use.
2.1.4 Blower Wheels
Before installing any GEN 4 evaporator assembly, spin
the blower wheels by hand to insure they turn freely. It is
possible they could have been knocked out of alignment
during transit. This would be easier to correct before
installing.
CAUTION
When installing a GEN-5 evaporator assembly, never push against the blower wheel. It
can easily be knocked out of balance. Hold
unit up to the ceiling with the evaporator
framing, not the blower wheel.
must be taken to ensure that the bus roof is properly
sealed to prevent leaks.
2.1.7 Mounting (Side)
Mounting brackets (front & rear) must always be
attached to the bus roof bows. Installing the mounting
brackets to the bus ceiling skin will not provide sufficient
support for the evaporator.
2.1.8 In-Wall Evaporators
In-Wall Evaporators are installed in the rear and/or front
of a bus. The interior bus wall in the designated area
must be removed in order to accomodate and install
these type evaporators. Some of Carrier Transport A/C
In-Wall evaporators assemblies are “OEM” specific.
2.1.9 Drain Lines
The drain lines must always run down hill immediately
from the attachment point on the evaporator drain pans.
Both drains should be run independently and in opposite
directions for maximum efficiency. Drain line routing
must be smooth and without kinks. Failure to properly
route the drain lines may result in water back-up into the
passenger compartment.
2.1.10 Ducted Systems
In ducted systems, insure that all refrigerant hoses and
electrical harnesses are firmly attached to the ceiling.
Failure to secure these components may cause noise
and vibration, inadequate air flow, or a blockage that will
degrade the system cooling.
2.1.11 Bus Headliners
Bus ceilings with noise abatement headliners
(perforated) must be sealed with a non-porous
insulating material in the areas that will be covered by
ducts prior to installation of the ducts to the ceiling.
CAUTION
NOTE
When a GEN-5 blower wheel is damaged during installation, it must be replaced, it cannot be
repaired.
Failure to seal these noise abatement headliners (perforated) will allow dissipation of
the air and marginal cooling.
2.1.5 Aesthetics
When the installation is completed, the evaporator
fittings and trim should be visually examined for
completeness and looks. All trim should be flush and
mounting hardware hidden from sight where possible in
a manner designed to be pleasing to the customer.
2.1.12 Mounting Hardware
All Carrier Transport Air Conditioning evaporators are
supplied with the proper mounting hardware. Never
substitute mounting hardware without the permission of
Carrier Transport Air Conditioning. Proper mounting
procedures are supplied with every evaporator.
2.1.6 Mounting (Front & Rear)
Carrier Transport Air Conditioning recommends
sufficient structure be built into the bus ceiling by the
“OEM” (original equipment manufacturer) so that the
bus roof will not have to be drilled through when
mounting the evaporator assemblies. When and if the
bus roof is drilled through to mount the evaporator, care
2--1
CAUTION
Use of substitute hardware or failure to follow the installation instructions may result
in structural fatigue and/or breakage.
T--311
2.2 REAR MOUNTED EVAPORATORS
2.2.1 GEN 4/5 Series EM-1, EM-2, EM-3, EM-7,
EM-6, & EM-14
To install the evaporator assembly in the rear of a bus
utilize the following installation procedures:
a Un-pack the evaporator and check for any obvious
damage (Refer to Sec. 1.8).
b Check the interior of the bus/vehicle to make sure
the evaporator(s) can be safely and properly installed in
the selected area. Refer to Table 2-1 or Table 2-2 for
evaporator dimensions.
Table 2-1 GEN 4 EVAPORATORS
Evaporator
A (width)
B (height)
C (depth)
EM-1
41.12inch
9.88 inch
22.25 inch
EM-2
41.12 inch
9.88 inch
22.25 inch
EM-3
59.44 inch 10.75 inch 22.75 inch
EM-6
25.63 inch
9.88 inch
22.25 inch
EM-14
36.13 inch
7.00 inch
19.91 inch
c Plan refrigerant hose, drain lines, and electrical
harness routing. Some small bus applications will allow
routing inside the walls and back panel. If this is the case
it is better to route your hose, drain lines, and electrical
harnesses before mounting the evaporator. Refer to
Section 4 for detailed instructions regarding hose,
harness, and drain-line routing.
d Locate and review installation instructions supplied
with the evaporator assembly. Review piping and wiring
diagrams for proper hose and fitting size, and the
correct wiring harness. Refer to Section 4 for detailed
instructions regarding hose and harness routing.
e For ease of installation, trace evaporator tray unto
cardboard or other thin material. Refer to the installation
drawing for the dimension the evaporator assembly has
to be from the back wall. Refer to Table 2-3 or Table 2-4
for these dimensions if the installation drawing is not
available. Example: For an EM-1 GEN 4, this dimension
is 7 Inches. Without this added dimension the return air
grill will not fit on to the evaporator cover. The GEN 5
series of evaporators mounts directly against the rear
wall.
Table 2-2 GEN 5 EVAPORATORS
Evaporator
A (width)
B (height)
C (depth)
EM-1
41.25inch
7.62 inch
19.13 inch
EM-2
33.95 inch
7.62 inch
19.13 inch
EM-3
59.44 inch
7.62 inch
19.13 inch
EM-7
26.64 inch
7.62 inch
19.13 inch
NOTE
An optional rear panel is available for all the
Gen 5 evaporator assemblies. This panel is
used when the rear wall is curved and the evaporator cover cannot fit flat against the rear wall.
This panel can be trimmed to compensate for
the ceiling curve. Contact the Carrier Transport
Air Conditioning Technical Service Hot Line
(1--800-450-2211) for assistance in obtaining
these panels.
NOTE
Except for the EM-3, all the evaporators listed in
paragraph 2.2.1 can also be mounted in the
front and/or on either side of the vehicle.
f
Mark and drill all mounting holes and cut out
template. See Figure 2-1.
NOTE
In some cases it may be necessary to relocate
the ceiling lights and/or speakers.
g Mark center of template in order to match center of
bus ceiling. See Figure 2-1.
Center of Bus Ceiling
Center of
Template
Evaporator Mounting Holes
Evaporator Mounting Holes
Cardboard
EM-1/2 Template
Drain Line
Location
Drain Line
Location
Back Wall
of Bus
Figure 2-1 Template For EM-1 And EM-2 (GEN 4)
T--311
2--2
Change 07/09
Table 2-3 DISTANCE TO BACK WALL (GEN 4)
GEN 4 Evaporator
Distance to back wall
EM-1
7 Inches
EM-2
7 Inches
EM-3
4.5 Inches
EM-6
7 Inches
EM-14
8.75 Inches
Figure 2-4 7/16 Inch Holes in Bus Roof
Table 2-4 DISTANCE TO BACK WALL (GEN 5)
GEN 5 Evaporator
Distance to back wall
EM-1
4.125 Inches
EM-2
4.125 Inches
EM-3
4.125 Inches
EM-7
4.125 Inches
l
Matching holes in reinforcing rails to holes in bus
roof, drop 3/8 inch carriage bolts through mounting rails
and the roof. The carriage bolts should drop through the
roof easily. You may have to open the holes slightly, Do
not force the bolts through the roof or ceiling.
Figure 2-2 Measurement To Wall (GEN 4)
BUS REAR WALL
Back of Top Panel
4.125 In.
Filter Assembly
Return Air
Mounting Holes
Mounting Holes
Figure 2-5 Carriage Bolts & Sealant
m Pull reinforcing rails and carriage bolts away from
bus roof. Apply a bead of sealant down the center of
each rail and under the carriage bolt heads. See
Figure 2-6 and Figure 2-7.
Cover
Figure 2-3 Measurement To Wall (GEN 5)
h
Locate center of bus ceiling and mark.
i
Centering the template against back wall and
ceiling, mark the bus ceiling and wall for evaporator
mounting holes and drain lines.
j
Using a 3/16 drill bit, drill 4 holes through the bus
ceiling. The smaller bit will allow you to check the angle
of the hole and where you have exited the bus roof. If the
angle is incorrect, the 3/16th hole is easily repaired with
a pop-rivet.
k After determining the pilot hole is correct enlarge
the 4 holes to 7/16 inch. See Figure 2-4.
2--3
Figure 2-6 Sealant Pattern on Mounting Channel
T--311
CAUTION
When installing any GEN 5 Evaporator assembly, be very careful not to push against
the blower wheel (s). The blower wheel can
easily be distorted and will have to be replaced.
Figure 2-7 Carriage Bolt Sealing
Figure 2-9 Locking Pliers & GEN 4 Evaporator
Figure 2-10 Evaporator Mounted to Flat Ceiling
Figure 2-8 Locking Pliers Clamped to Carriage
Bolts
Installation Hint
In order to keep carriage bolts from being forced
out of the reinforcing rails on the bus roof, use
small locking pliers to hold the bolts in place
(See Figure 2-8). Tighten the bolts until the
evaporator is almost touching the locking pliers
(See Figure 2-9). Remove the locking pliers
and continue tightening as described in step n.
Figure 2-11 Mounting Channel Sealing
o Seal outer edge of reinforcing rails. Improper
sealing of the reinforcing rails will allow water to leak into
the passenger compartment (See Figure 2-11).
Installation Hint
For ease in installing the evaporator cover on
buses with heavily contoured ceilings, insert
spacers (wood or metal) between the evaporator panel and bus ceiling. See Figure 2-17, item
j. Without these spacers you may need to trim
the top side edges of the evaporator cover.
p If refrigerant hose and wiring harness were
previously routed through the bus wall they can be
connected at this time. If not, the hose and harness, plus
the drain lines must be surface routed on the bus wall
using the hose cover kit provided. Refer to Section 4 for
detailed instructions regarding hose and harness
routing.
n Mount evaporator using 3/8 inch hardware and
tighten to bus ceiling. Do not over tighten, as this will
distort either the bus ceiling and/or roof.
T--311
2--4
q After the liquid and suction lines have been
connected and you are sure there are no leaks, the
suction fitting and the block valve must be wrapped with
“no-drip” tape in order to keep them from dripping
condensate into the passenger compartment.
Figure 2-14 Installed GEN 4 Evaporator
u With the cover removed, note the distance between
the top of the unit and the contour of the bus ceiling. If
this distance is more than 1 inch, it must be closed off to
prevent any recirculation over top of the evaporator. Use
the evaporator trim strip provided. Flat or almost flat
ceilings do not require any trim strip.
v Install return air grill to the evaporator cover. Some
trimming could be involved.
Figure 2-12 Block Valve Insulation
Trim this area
r Connect two drain lines to the EM-1 evaporator
drain pan assembly. Secure both drain lines with the
clamps provided with the system. One drain line can be
routed with the refrigerant hose and wiring harness,
while the other must be routed to the opposite side of the
bus. Drain lines must always run downhill, and care
must be taken not to kink the drain lines. Plastic 90°
elbows may be required to keep drain lines from kinking.
If in doubt, use the elbows supplied.
s After the drain lines have been routed to the outside
of the bus they should be cut approximately 6 inches
below the floor. Install condensate valve over the ends
of the drain lines. This prevents air from being drawn
through the lines into the evaporator which will stop the
flow of condensate from the drain pan. It also prevents
insects from entering the drain lines.
Return Air Grill
Figure 2-15 Return Air Grill
w Clean evaporator and hose covers with a mild
cleaning solution. Clean all debris from the interior of the
bus.
Drain Hose
Clamp, Drain Hose
Condensate Valve
Figure 2-13 Drain line & Condensate Valve
t
Fit evaporator cover over unit. If evaporator cover
needs no trimming mount cover with the hardware
provided.
2--5
Figure 2-16 Painted Mounting Channel
x For aesthetic purposes only, it is recommended that
the exterior reinforcing rails be painted the same color
as the bus exterior.
A typical installation drawing for a GEN-4 front or rear
mounted evaporator is shown in Figure 2-17 and a
completely installed rear mounted evaporator is shown
in Figure 2-18.
T--311
h
i
j
7/6 inch holes
g
k
f
l
n
d
a
a.
b.
c.
d.
e.
f.
g.
b
m
e
c
Snap Cap
Pan Head Screw
Snap Cap washer
Trim Strip
Flexible Trim
Evaporator Cover
Evaporator
h.
i.
j.
k.
l.
m.
n.
Mounting Channel
Carriage Head Bolt 3/8-16 x 4
Optional Spacers
Drain Line
Drain Line Clamp
Condensate Valve (Kazoo)
Locking Nut 3/8-16
Figure 2-17 GEN-4/5 Front/Rear (EM-1, 2, 6, & 14) Evaporator & Installation Hardware
Hose Cover Partially Blocking Rear Window
+
Figure 2-18 Rear Mount Evaporator (GEN 4) - Installed
T--311
2--6
X
Figure 2-19 Rear Mount Evaporator (GEN-5) - Installed
Figure 2-20 EM-6 (GEN 4) Rear Mounted In An Extended Roof Van
NOTE
If at all possible, always cover or conceal hoses,
harnesses and drain lines. If not possible or feasible. discuss with vehicle owner before continuing with installation.
there is sufficient passenger compartment air returned
to the evaporator assembly. The normal ratio of return
air in to evaporator air out is 2 to 1. The return air vents
must be high enough so there is no interference with the
return air flow.
2.2.2 Luggage Compartment Evaporator
If installing an evaporator assembly in an enclosure
such as a rear luggage compartment, you must insure
Change 07/09
2--7
Example: If there is 60 square inches of cooling vents,
you must have at least 120 square inches of return air
vents cut into the luggage compartment wall. If
assistance is needed, please contact the Carrier
Transport Air Conditioning Technical Service Hot Line
(1--800-450-2211).
T--311
bus roof and/or evaporator from distorting when
tightening the lock nuts.
2.2.3 EM-3 EVAPORATOR GEN 4 OR GEN 5
To install the EM-3 utilize the installation procedures
outlined in Paragraph 2.2 except as noted below. See
Figure 2-21 for a typical EM-3 installation drawing.
WARNING
NOTE
Threaded rod (3/8-16) is supplied with the EM-3
instead of 4 inch carriage bolts. Depending on
the contour of the bus roof the distance from the
ceiling to the evaporator could be up to 10 inches (Installer purchased 3/8-16 carriage bolts
can be substituted for the threaded rod).
Do not attempt to modify the EM-3 evaporator top panel. Modifications to the top panel
could structurally weaken the evaporator
assembly, causing system failures and/or
injuries to passengers.
NOTE
Most EM-3 installations will require the addition
of spacers between the ceiling roof and the
evaporator assembly (See Detail A,
Figure 2-21). These spacers will help keep the
NOTE
Any refrigerant hose and/or electrical harness
that was routed behind the evaporator assembly must be secured to the back wall or ceiling
with insulated clamps.
A
4
Apply Sealant
2
Wood
Spacers
3
1
Corner Of unit Should
JustContact Bus
Ceiling
3.75 IN. To Rear Wall
Side Of Bus
1
2
1.
2.
3/8 Flat Washer
3/8-16 Hex Nut, Locking
T--311
3.
3/8-16 Threaded Rod (Cut To Length)
4.
Mounting Bar
Figure 2-21 EM-3 Installation Diagram
2--8
2.3 SIDE MOUNTED EVAPORATOR - EM-1, EM-2,
EM-6, EM-7, & EM-14
k Loosely install evaporator assembly onto the front
and rear mounting brackets.
To install a side mounted evaporator assembly utilize
the following installation procedures:
l
a Un-pack the evaporator and check for any obvious
damage (Refer to Sec 1.8).
b Check the interior of the bus/vehicle to make sure
the evaporator(s) can be safely and properly installed in
the selected area.
c Plan refrigerant hose, drain lines, and electrical
harness routing.
d Locate and review installation instructions (See
Figure 2-24). Review system piping and wiring
diagrams for proper hose and fitting size, plus the proper
wiring harness. Refer to Section 4 for detailed
instructions regarding hose and harness routing.
Tighten rear mounting hardware.
m Level evaporator assembly front to rear using a
small level and the 3/8-16 jam-nuts (See Figure 2-23).
n Tighten all jam-nuts and lock-nuts on front and rear
mounting brackets and evaporator assembly.
o Connect refrigerant hoses (Liquid and Suction) and
electrical harnesses at this time. Refer to Section 4 for
proper routing of hoses and harnesses.
p After the liquid and suction lines have been
connected and you are sure there are no leaks, wrap
(coat) the suction fitting and the block valve with
“no-drip” tape in order to keep them from dripping
condensate into the passenger compartment.
e Locate full-scale drawing of the side mounted
evaporator you are installing. Glue drawing onto
cardboard or other thin material. Cut-out template.
Level
f
Hold template to bus ceiling and back wall. See
Figure 2-22.
Rear Mounting Rail
No-Drip Tape
Front Mounting Rail
Drain Line Elbow
Figure 2-23 Drain Line Elbows
q Connect two drain lines to the evaporator assembly.
Drain lines must always run downhill, and care must be
taken not to kink the drain lines. Plastic 90° elbows may
be required to keep drain lines from kinking. If in doubt,
use the elbows supplied. See Figure 2-23.
Figure 2-22 Side-Mount Template
r After the drain lines have been routed to the outside
of the bus they should be cut approximately 6 inches
below the floor. Install condensate (“kazoo”) tubing over
the ends of the drain lines. This prevents air from being
drawn through the lines into the evaporator which will
stop the flow of condensate from the drain pan. It also
prevents insects from entering the drain lines.
CAUTION
When selecting a location for installing the
evaporator it is highly recommended that
two roof bows are used to secure the
mounting rails.
g
s Fit evaporator cover over unit. The evaporator
cover must be trimmed to fit the contour of the bus
ceiling and wall.
Mark location of front and rear mounting brackets.
h Insert carriage bolts into the rear mounting bracket
before installing.
i
Install the mounting brackets using steel rivets
supplied in the installation kit. Insure all predrilled holes
in mounting rails are utilized.
j
Loosely assemble mounting hardware onto front
hanger brackets as shown in installation drawing and
Figure 2-24.
2--9
t
Install trim strip to the evaporator cover and side
wall. Some trimming could be involved (See
Figure 2-25).
u Mark and trim the front trim strip. Most trimming will
be along the side of the trim strip.
v
Install evaporator cover using hardware supplied.
w Clean evaporator and hose covers with a mild
cleaning solution. Clean all debris from the interior of the
bus.
T--311
6
14
9
6
Top Panel
8
11
12
13
10
8
Top Panel
3
7
6
5
4
7
Rear Hanger Assembly
Front Hanger Detail
Front Hanger Assembly
1
GEN 4/5 Evaporator Cover
2
Figure 2-24 Side Mount Installation Instructions (Typical)
1.
2.
3.
4.
5.
6.
7.
8.
Trim Strip - Front
Trim Strip - Rear
Rear Hanger Bracket
3/8-16X1 Carriage Head Bolt
Spacer, 1/8 Inch
Flat Washer
3/8-16 Hex Nut, Lock
3/8-16 Hex Nut
9.
10.
Front Hanger Bracket
Lock washer
11.
12.
13.
14
3/8-16 X 6 Carriage Head Bolt
3/8-16 X 2 Hex Head Bolt
Front Hanger
Spacer, 1 inch
T--311
Figure 2-25 Side Mounted Evaporator GEN 4
2--10
Trim Lock
Side Trim Strip
Transition
Rear Trim Strip
Hose Covers
Transition
Figure 2-26 EM-2 (Gen V) Side-Mount - Free Blow, Installed (Complete)
2--11
T--311
2.4 EM-9 DUCTED EVAPORATOR
The EM-9 evaporator is normally located slightly
forward of the bus center on the drivers side and slightly
rear of the bus center on the passenger side. See
Figure 2-30.
To install the EM-9 ducted evaporator assembly utilize
the installation procedures outlined in Section 2.3, steps
a through r, then continue with the following steps:
e Mark and cut the duct section when routing
hose/harness out of the ducting. Insure the hose cover
will completely cover the hole cut into the duct. See
Figure 2-29 and Figure 2-34.
f
Snap a chalk line to insure duct sections are
installed straight on the ceiling and the wall.
g Starting at the evaporator, temporarily position a
duct section in place.
h Mark duct section as to where seats are located.
There should be one louver per seat.
NOTE
Because of the ducting that will be installed the
length of the bus, refrigerant hoses and electrical harnesses can enter or exit the bus floor at
any convenient location. Hoses and harnesses
must be bundled and clamped to the bus ceiling
within the confines of the air conditioning ducts.
See Figure 2-27.
i
Using a hydraulic press or hole saw, cut 3 inch holes
where the louvers are to be located, alternating top to
bottom on all the duct sections. See Figure 2-28. Do not
install the louvers until the installation is complete.
j
The rear duct sections should butt against the back
wall of the bus. The front duct sections must be capped.
Trim the end caps to fit inside the forward duct sections.
k Cut or punch a 3 inch opening in the drivers end cap
and install a louver assembly. See Figure 2-29.
NOTE
Drain lines cannot be routed with the refrigerant
hoses and electrical harnesses as shown in
Figure 2-27. Drain lines must exit the evaporator and immediately run down-hill. The drain
lines in Figure 2-27 are routed within the bus
wiring channel to the hose cover.
l
If preferred, trim evaporator, end caps, and hose
covers with trim lock.
a Trim cover to the contour of bus ceiling. Trim around
the hose/harness cover if routed from rear of evaporator
cover. Temporarily install over evaporator assembly.
b Hold duct section against the evaporator cover,
ceiling, and wire channel (wall).
NOTE
Optional “school style ducting” is available from
Carrier Transport AC (See Figure 2-31 &
Figure 2-32). Contact the Carrier Transport Air
Conditioning Technical Service Hot Line
(1--800-450-2211) for availability.
c Trace contour of duct end onto evaporator cover.
Do this on both sides of the cover.
m Clean evaporator and hose covers with a mild
cleaning solution. Clean all debris from the interior of the
bus.
d Cut duct tracing leaving approximately 1/4 inch on
evaporator cover. See Figure 2-27. This allows the duct
section to butt against the evaporator cover.
n Install louvers in ducts and end cap. See
Figure 2-30 for a complete ducted evaporator
installation.
Trim Lock
Clamp
Clamp
Tie-Wrap
Bus Wiring Channel
Hose Cover
Figure 2-27 EM-9 Ducted Evaporator - Hose & Harness Routing
T--311
2--12
Change 07/09
Figure 2-28 Punching out Louver Holes
Figure 2-29 End Cap With Louver
Figure 2-30 EM-9 Ducted Evaporator - Location - Completed Assembly
Figure 2-31 School Style Ducting-Passenger Side
2--13
Figure 2-32 School Style Ducting-Drivers Side
T--311
Figure 2-34 Side Mounted Hose Routing (Straight)
Figure 2-33 Side Mounted Hose Routing
(Using 45° Angles)
T--311
2--14
2.5 EM-17 EVAPORATOR
The EM-17 is available in single and dual loop
applications. Due to the weight and size of the
evaporator assembly it is recommended that this type
evaporator and accompanying condenser and electrical
controls be installed only by OEM’s (Original Equipment
Manufacturers).
Reinforced mounting channels must be welded to the
bus roof bows in order to support the evaporator
assembly. An example of this application can be seen in
Figure 2-35.
Before attempting to install this type system, it is
strongly advised that you contact Carrier Transport Air
Conditioning Technical Service Hot Line for assistance
(1-800-450-2211).
Figure 2-35 EM-17 Installed
2--15
T--311
2.6 IW-1, IW-2, & IW-14 EVAPORATORS
The IW (In-Wall) evaporator assemblies are designed to
be installed in the rear and/or front wall of a bus.
To install the In-Wall evaporator a section of the vehicle
wall must be removed (cut-out) in order to expose the
bus structure rails necessary to mount the IW
evaporator assembly.
NOTE
Steps a through q cover the installation of an
IW-1 in the Rear of an IC bus. Additional steps
relating to Front mounted IW’s are discussed at
the end of this section.
2.6.1 Rear Mounted In-Wall Evaporator
To install the evaporator assembly in the rear of a bus
utilize the following installation procedures:
a Un-pack the evaporator and check for any obvious
damage (Refer to Sec. 1.8).
b Check the interior of the bus/vehicle to make sure
the IW-Evaporator(s) can be safely and properly
installed in the selected area. Refer to Table 2-5,
Table 2-6, or Table 2-7 for evaporator dimensions.
Table 2-5 IW-1 EVAPORATOR DIMENSIONS
Width
Height
Depth
Evaporator
77-62162-00
45 inch
13.78 inch 7.09 inch
77-62162-01 43.9 inch 13.78 nch 7.09 inch
77-62162-02 47.15 inch 13.78 inch 7.09 inch
77-62162-03 45.00 inch 13.78 inch 7.09 inch
NOTE
When attemping to install an aftermarket InWall evaporator make sure you have the correct evaporator and cooresponding mounting
brackets & cover necessary to complete the inwall installation. All bus manufacturers (OEM’s)
construct their buses (vehicles) differently and
it stands to reason that there will be different
mounting brackets & cover arrangements for
most OEM’s. If in doubt, contact the Carrier
Transport Air Conditioning Technical Service
Hot Line (1--800-450-2211).
c Find center of wall area, rear or front, where the
In-Wall evaporator will be located and mark for the
evaporator cut-out. Width and Height dimensions from
Table 2-5 thru Table 2-7 is the size of the cut-out. An
additional two (2) inches of cut-out will be required on
the left side (Block-Valve side) in order to have access to
the refrigerant hose, wiring harness and drain lines (See
Figure 2-36).
INSTALLATION HINT
When installing more than one In-Wall evaporator it is recommended that a template be made
from cardboard or other thin material.
NOTE
Some bus manufacturers have access panels
on the rear and front walls of their vehicles. Removing these panels will allow you access to
the interior space between the inner & outer
walls (See Figure 2-57). Adding 2 inches to the
cut-out width as explained in step c is not necessary.
Table 2-6 IW-2 EVAPORATOR DIMENSIONS
Evaporator
Width
Height
Depth
77-62167-00
34 inch
12.6 inch
8.30 inch
77-62167-01
34 inch
12.60 nch 8.30 inch
77-62167-02
38 inch
12.60 nch 8.72 inch
d Making sure there are no wires, insulation or other
obstructions behind the wall, carefully cut out and
remove the marked area. The bus structure rails will be
exposed (See Figure 2-37). These structure rails
should match up with the In-Wall mounting brackets.
Additional triming of the opening may be required for
ease of installation. The green painters tape is used to
keep from scratching the interior paint.
Table 2-7 IW-14 EVAPORATOR DIMENSIONS
Evaporator
Width
Height
Depth
77-62080-11
43.9 inch 16.38 inch 7.10 inch
2 Inches Added To Cut-Out
Figure 2-36 In-Wall Marked For Cut-Out
T--311
2--16
Change 07/09
Figure 2-37 In-Wall Cut-Out (Panel Removed)
CAUTION
When installing any IW unit, be careful not to cut the bus structure rails or wiring harnesses.
Figure 2-38 In-Wall Cut-Out (Insulation Removed)
Bracket To Hold Wiring Up
Left Structure Rail
Right Structure Rail
Figure 2-39 In-Wall Cut-Out (Wires Supported)
e Carefully remove the insulation from between the
evaporator. Move the wiring to the top of the cut-out and
walls. Nothing should interfear with the In-Wall
support in place (See Figure 2-39).
2--17
T--311
Move Ground To Area
Above In-Wall Evap.
Figure 2-42 In-Wall Hose Cover Back
i
Secure hose backs to bus wall. Route refrigerant
hose, electrical cable and drain lines to the IW
evaporator. Refer to Section 4, Hose Routing
Procedures and Section 5, Electrical
Figure 2-40 Bus Electrical Harness Ground
f
Remove bus grounding screw and relocate to an
area that doesn’t interfear with the In-Wall evaporator
(See Figure 2-39 & Figure 2-40).
g Carefully cut access holes in the bulkhead (rear)
and floor, following the procedures outlined in Section 4,
Hose Routing Procedures.
h The area where the drain lines are layin is flat. Notch
out a small area so the drain line elbow will be lower than
the flat area, thus allowing any water to drain away
quickly (See Figure 2-41).
INSTALLATION HINT
Remove the red light immediately behind the
area where the hose and harness is routed.
This will allow you access to the area between
the inside and outside walls making it much
easier to route the refrigerant hose and electrical cable to the evaporator. (See Figure 2-43).
Notch-out for
Drain Line Access
Figure 2-41 In-Wall Hose/Drain Line Cut-Out
T--311
Figure 2-43 Bus Light Removed For Access
2--18
Evap. Harness
Mounting Bolt
Suction Line
Electrical Connections
Liquid Line
Drain Line
Ground Screw
Structure Rail
No-Drip Tape
Figure 2-44 Hose/Harnes/Drain Routed To IW
j
Attach the IW Evaporator Assembly to the bus
structure using the appropriate hardware. See
Figure 2-45 and Figure 2-46.
k Remove plugs or tape from the hose ends and
attach the appropriate fittings to the hose assemblies.
Refer to Section 4, Hose Routing Procedures.
NOTE
Do not remove plugs from the expansion valve
or hose ends until you are ready to attach fittings to the hose and then to the evaporator assembly.
Mounting Bolt
Drain Line
Clamp
Figure 2-45 IN-Wall Installed (Left-Side)
Structure Rail
l
Carefully connect suction and liquid refrigerant lines
to block valve. Refer to Section 4, Hose Routing
Procedures.
Mounting Bolt
CAUTION
Because of the limited access to the block
valve, start the fittings by hand (finger tightening) making sure that there is no crossthreading before tightening. When tightening the fittings, make sure that the Block
Valve does not move.
Mounting Bolt
m Connect the evaporator harness to the In-Wall
evaporator. Make sure all wires are secure in the
butt-connectors. Refer to Section 5, Electrical.
n Securely ground the evaporator using the green
wire in the harness to the structure rail. Normally this
ground wire would be secured to a chassis rail under the
bus.
Figure 2-46 In-Wall Installed (Right-Side)
o Connect the drain lines to the In-Wall evaporator.
Make sure the drain lines run down hill. Always clamp
the drain hose to the evaporator assembly. See
Figure 2-45.
p Making sure refrigerant hoses, electrical cable and
drain line are secure within the hose covers and through
the floor (Refer to Section 4, Hose Routing Procedures)
snap the hose cover assemblies together. There is no
need to use screws or tie-wraps. Caulk or Trim-Lock
around the top edge, if needed (See Figure 2-47).
NOTE
Drain lines must always drain to both sides of
the vehicle.
q Trim the IW cover to fit ceiling contour. Apply trim
lock around edges of cover. Using hardware supplied in
kit, securely mount the IW cover to the IW evaporator
assembly.
2--19
T--311
Figure 2-47 Hose Cover Installed (Left-Side)
Figure 2-48 In-Wall With Trimmed Cover (Rear)
T--311
2--20
2.6.2 Front Mounted In-Wall Evaporator
Installation of an In-Wall in the front wall of a bus
requires a little more thought and planing than when
installing a rear mounted IW. These could include, but
would not be limited to:
1 The safest and least intrusive way to route refrigerant
hose and electrical cable
2 How and where to route drain lines.
3 Drivers visibality not impaired.
Figure 2-49 Front In-Wall Template
Ground Location Moved
Access Cut-Out
Figure 2-50 Hose/Harness/Drain Line Routing & Access Cut-Out
Cut-Out Too High
Serial/Model Data Tag
Fitting Access Hole
Figure 2-51 In-Wall Front Installation
2--21
T--311
ing the fittings, make sure that the Block
Valve does not move.
CAUTION
Never route refrigerant hose, electrical
cable or drain lines in any location where
driver’s visibality would be impaired.
r Follow steps a through c above. The additional 2
inches of cut-out may not be required if there is access
from another source (See Figure 2-50 & Figure 2-52).
In the example shown, the indicator light assembly was
removed which allowed access between the interior and
exterior walls.
CAUTION
When marking the cut-out for a front
mounted In-Wall be very careful not to cut
too much off the top radii.
Figure 2-52 In-Wall Installed (Front Mount)
NOTE
The front metal cover leaves little room for error. If a cutting error does occur, a metal piece
painted to match the color of the bus interior
must be fabricated and installed to hide the cutting error (See Figure 2-51 and Figure 2-55).
Door Mechanism
Clamp
s In this application a hole was cut through the bus
structure rail. This allowed for connection of the
hose/fittings to the block valve (See Figure 2-51).
Clamp
CAUTION
When removing any electrical item involving multiple plugs/sockets it is recommended that you mark both sides of the
plug/socket arrangement. This way you will
not have to guess what goes where when
re-connecting.
Figure 2-53 Hose Routed Over Door (Closeup)
CAUTION
t
In this example the hose was routed from the
passenger side, over the top of the entrance door, over
the top of the IW evaporator and connected to the block
valve. Removal of the indicator light assembly allowed
access for fitting/hose assembly and connection.
Never tie-wrap or secure in any way, refrigerant hose or electrical cable to any part
that may move during the normal operation
of the vehicle. Always use insulated clamps
to secure to the bus wall. (See Figure 2-53 &
Figure 2-54)
NOTE
Refrigerant hose, electrical cable and any bus
wiring must be securely clamped above the IW
evaporator assembly before attempting to
install the In-Wall.
Clamp
CAUTION
Clamp
Because of the limited access to the block
valve, start the fittings by hand (finger tightening) making sure that there is no crossthreading before tightening. When tightenT--311
Figure 2-54 Hose Routed Over Door
2--22
Cut-Out Too High
Mounting Screw
Mounting Screw
Locking Tab
Locking Tab
Figure 2-55 In-Wall With Trimmed Cover (Front)
u To install the metal cover to the front mounted IW-1
assembly, carefully line-up and place the two slotted
mounting tabs above the IW-1 drain pan and push down
(See Figure 2-56). The cover should slide into the drain
pan easily, with very little resistance. Making sure the
top holes are lined up properly, secure the cover with
two screws supplied with the installation kit. Tug on the
bottom of the cover to make sure it is firmly secured to
the IW-1.
NOTE
If the metal cover mounting tabs do not slide
into the drain pan easily you will have to space
out the IW-1 assembly with thin washers placed
between the bus structure rails and the IW-1
mounting plates. Do not space the IW-1 out too
far or the cover will not be snug against the front
wall.
Locking Tab
Locking Tab
Figure 2-56 In-Wall Cover - Locking Tabs
2--23
T--311
2.6.3 In-Wall Evaporator - TBB
Figure 2-57 shows the back wall (cut-out) of a TBB
removed. Figure 2-58 shows an IW-1 installed in the
rear of a TBB. Figure 2-59 shows the IW-1 with the
mounting hardware. The preparation is basically the
same as any I-W installation but with the TBB you have
an access panel that covers most of the rear wall. Notice
the dotted lines in Figure 2-57. When this panel is
removed you will be able to see where the structure rails
and electrical harness are located. In most TBB
applications, the electrical harness does not have to be
relocated in order to install the In-Wall.
Structure Rail
Access Panel Removed
Figure 2-57 In-Wall Cut-Out (TBB)
Serial/Model Data Tag
Figure 2-58 IW-1 Installed In TBB (Rear)
2.7 EM-20, EM-21 & EM-22 EVAPORATORS
The EM-20, EM-21 and EM-22 are floor mounted
heating/cooling units normally used on ambulances
and/or armored vehicles. For installation instructions
and or information on these type systems contact the
Carrier Transport Air Conditioning Technical Service
Hot Line (1--800-450-2211).
2.8 EM-23 COOL/HEAT EVAPORATOR
Figure 2-59 IW-1 Secured To Structure Rail TBB
T--311
2--24
The EM-23 is an after-market heating/cooling unit
normally installed in the vehicle dash. For installation
instructions and or information on these type systems
contact the Carrier Transport Air Conditioning Technical
Service Hot Line (1--800-450-2211).
Change 07/09
SECTION 3
CONDENSERS
3.1 INTRODUCTION
3.1.1 Description
Condensers are normally located in the bus skirt or on
the bus roof. Their primary function is to reject heat from
the refrigerant to the exterior of the vehicle.
3.1.2 Location
Assure that the condenser will mount properly in the
location of choice. Always try to fit skirt mounted
condensers between the front and back wheels and
always as close to the bus skirt as possible. This
assures adequate air flow and avoids recirculating heat
from under the bus.
NOTE
To minimize air recirculation, install condenser
as close to skirt as possible. If distance is 3
Inches or greater, skirting is required to prevent
recirculation of air.
3.1.3 Cap Plugs
Carrier Transport Air Conditioning condensers are
leak-checked and shipped with a charge of inert gas to
keep the coil dry. Do not remove any of the caps/plugs
from the condensers until you are ready to connect the
refrigerant lines to them.
3.1.4 Protection
When a skirt condenser must be mounted close to a
vehicle wheel, Carrier Transport Air Conditioning
recommends that the condenser be protected from
wheel-sling (mud, water, road salts, etc.) by a splash
guard. Failure to properly locate and protect the
condenser may cause a variety of problems, from
corrosion to inefficient cooling, pressure increases, and
compressor failure.
3--1
3.1.5 Obstructions
To function efficiently the air inlet and outlet of the skirt
condenser must be free of any obstruction, including the
bus chassis rail and the bus skirt. Failure to have free air
flow will restrict the rate of heat rejection causing a
pressure rise in the system. Excessive pressure may
cause cooling inefficiencies and possible compressor
failure. The bus skirt must always be cut out when
installing a skirt mounted condenser.
3.1.6 Skirt Supports
Whenever a bus skirt support must be removed in order
to mount the condenser, the skirt must be resupported
by the condenser assembly or by attaching an alternate
skirt support. All skirt mounted condenser screens must
be flat against the vehicle skirt.
3.1.7 Mounting (Skirt)
All Carrier Transport Air Conditioning condensers are
supplied with the proper mounting hardware. Never
substitute mounting hardware. Always insure that the
skirt mounted condensers are mounted on a flat surface
and are level. Carrier highly recommends that “OEM’s
(original equipment manufacturers) provide condenser
mounting brackets in order that the bus floor does not
have to be drilled through when mounting/installing the
skirt condenser.
3.1.8 Mounting (Rooftop)
When mounting a roof top condenser, alterations must
be made to the bus roof. The installation instructions
include sealing instructions which must be followed.
Failure to follow these instructions will allow water to
enter the passenger compartment.
3.1.9 Voltage
Carrier Transport Air Conditioning condensers are
designed to operate efficiently at 12.5 and 25 Volts
respectively. Condensers operating at less than the
required voltage will cause the fans to run slower and
may cause pressure buildup and possible compressor
failure.
T--311
a problem, the CM-2 and CM-3 skirt--mounted
condensers can be stacked on each other with a kit
available from Carrier Transport Air Conditioning (Refer
to paragraph 3.7) Carrier Transport Air Conditioning
condenser assemblies are listed in Table 1-7 &
Table 3-1 .
3.2 CONDENSERS
Condensers are normally located on the outside of the
vehicle. Their primary function is to reject heat absorbed
by the refrigerant from the passenger compartment to
the outside air. Condensers are normally located on the
vehicle skirt or on the roof. If space in the vehicle skirt is
Table 3-1 CONDENSERS (Used With GEN 4 And GEN 5 Series)
Component
Type
CFM (Approx)
CM-2
SKT MT
1600
CM-2
Micro--Channel
SKT MT
1600
CM-3
SKT MT
2400
SKT MT
2400
SKT OR RF MT
SKT MT
1300
6000
RF MT
1950
Amps
14 @12.5
16 @ 25V
14 @12.5
16 @ 25V
21 @12.5V
24 @ 25V
21 @12.5V
24 @ 25V
13 @12.5V
41 @24V
21 @12.5V
12 @ 25V
RF MT
1300
13 @12.5V
KR-2
RF MT
1990
KR-3
RF MT
2980
KR-4
RF MT
3500
CM-14
SKT MT
1800
CM-2 STKD (2 ea)
CM-3 STKD (2 ea)
SKT MT
SKT MT
3200
4800
CM-3
Micro--Channel
CM-4
CM-5
CM-7
No Longer Offered
CM-11
No Longer Offered
14 @12.5V
16 @ 25V
21 @12.5V
24 @ 25V
44 @12.5V
22 @ 25V
27.5 @12.5V
30 @ 25V
30 @12.5V
45 @12.5V
Weight
66 Lbs.
45 Lbs.
76 Lbs.
59 Lbs.
59 Lbs.
202 Lbs.
87 Lbs.
77 Lbs.
70 Lbs.
95 Lbs.
187 Lbs.
95 Lbs.
144 Lbs.
168 Lbs.
Legend:
CM - Condenser Module KR - Roof Mounted RF - Roof Mounted SKT - Skirt Mounted STKD - Stacked
3.3.1 SKIRT--MOUNTED INSTALLATIONS
3.3 CM-2, CM-3, CM-4, CM-5, & CM-14 SKIRTMOUNTED CONDENSER ASSEMBLIES
To install the skirt mounted condenser assemblies
utilize the following installation procedures:
The Carrier Transport Air Conditioning Condensers
listed in paragraph 3.3 are designed so they can easily
a. Unpack the condenser and check for obvious dambe installed in the skirt of a bus, while other condenser
age.
assemblies are mounted on the bus roof.
b. Make a condenser mounting template from cardCheck the location selected under the bus for any
board or other thin material.
obstacles that might interfere with the proper installation
c. Lay condenser upside down on the template material.
of the condenser assembly.
Using the dimensions listed in Table 3-2, determine that
the condenser assembly will fit safely and securely in
the desired location.
Table 3-2 SKIRT MOUNTED COND. DIMENSIONS
Width
Height
Depth
Condenser
CM-2
35.75 inch 10.312 inch 15.75 inch
CM-3
48.0 inch 10.312 inch 15.75 inch
CM-4
39.0 inch
8.38 inch
14.50 inch
CM-5
87.5 inch
15.25 inch 15.281 inch
CM-14
61.0 Inch
10.37 Inch 15.75 Inch
T--311
d. Align the front of the condenser with the straight edge
of the template material.
e. Mark all of the oblong mounting holes located in the
front and rear of the condenser assembly.
f. Mark outer edges of the condenser assembly on to
the template material.
g. Remove condenser from template material and cutout template and oblong mounting holes.
h. Mark center of template.
i. Using the condenser template under the vehicle, find
the optimum location between the front and rear
wheels of the vehicle and mark the mounting holes.
3--2
Note
The condenser assembly should contact as
many of the floor supports (stringers) as possible, while hitting the least amount of skirt supports.
Bus Floor
Bus Stringer
Note
Always attempt to use at least one of the vehicles floor supports (stringers) to mount the
condenser assembly.
j. Drill pilot holes up through the bus (vehicle) floor.
CAUTION
Make sure there is nothing installed where
you are going to drill through the bus floor.
k. Using the pilot holes, drill 7/16 inch holes through the
bus floor or stringers. See Figure 3-1.
Figure 3-1 3/8 Inch Carriage Bolts Thru Floor
l. Mount the condenser using 3/8 inch diameter hardware. See Figure 3-2.
m.Install grill/screen on condenser assembly or skirt of
bus, depending on application.
n. Connect discharge and liquid lines. Refer to Section
4, hose routing.
o. Connect electrical harness to condenser. Refer to
Section 5, electrical.
NOTE
To safely attach/mount the CM-2 it will require a
minimum of 4 bolts, while the CM-3 requires 6
bolts.
NOTE
Block spacers or jam-nuts may be required if
the condenser mounting area is not tight
against the bus stringers. See Figure 3-3.
Figure 3-2 Condenser Mounted With Hardware
3--3
T--311
BLOCK SPACER REQUIRED
IF NO STRINGER AT
MOUNTING LOCATION
ALTERNATE MOUNTING
BUS FLOOR
STRINGER
CONDENSER
Not Required When
Using Chassis Grill
Figure 3-3 Installation Drawing (Typical Skirt Mounted)
Condenser Mounted Grill
Figure 3-4 CM-2 With Chassis Mounted Grill On An Extended Roof Van (Custom)
T--311
3--4
Chassis Mounted Grill
Figure 3-5 CM-3 With Chassis Mounted Grill In A Cut-A-Way Chassis
Refer to the installation drawing enclosed with the
condenser or see Figure 3-6.
3.4 CM-5 CONDENSER
The Carrier Transport Air Conditioning CM-5
Condenser is designed to be installed in the skirt of the
bus.
To install the CM-5 Condenser utilize the installation
procedures found in paragraph 3.3.
Note
Because of the size and weight of the CM-5
condenser assembly, ten (10) bolts are required to safely install it to the bus floor stringers, Five (5) in the front and (5) in the rear.
CM-5 CONDENSER
MOUNTING HARDWARE
SUPPLIED BY INSTALLER
ALTERNATE MOUNTING
FLOOR
SPACER
GRILL (3)
SKIRT
POP RIVET, 3/16” STEEL
OR SELF DRILLING SCREWS
MOUNTING HARDWARE
SUPPLIED BY INSTALLER
NOTE: MINIMUM HARDWARE REQUIRED
CM-5 (10) 3/8-16 GRADE 5 BOLTS
Figure 3-6 CM-5 Installation Drawing
3--5
T--311
3.5 KR-4 ROOFTOP CONDENSER ASSEMBLY
The Carrier Transport Air Conditioning KR4 condensers
are designed to be installed on the roof of the bus. They
are available in single and dual loop configurations.
Refer to Table 3-3 for Rooftop Condensers dimensions.
Table 3-3 ROOF--MOUNT COND. DIMENSIONS
Width
Height
Length
Condenser
KR-2
37.86 inch
9.25 inch
36.55 inch
KR-3
50.11 inch
9.25 inch
36.55 inch
KR-4
52.75 inch
7.25 inch
73.22 inch
3.5.1 ROOFTOP CONDENSER INSTALLATIONS
To install the KR4 rooftop condenser utilize the following
installation procedures:
a. Select a location on the bus roof where the condenser
and/or mounting channels will span three roof bows.
(Three (3) are preferred, but never no less than two
(2) roof bows.
Note
The ideal location will be close to the evaporator
inside the bus as well as spanning three roof
bows.
b. Remove the rooftop condenser from the shipping
box. Locate the two mounting channels (if used) and
mounting hardware.
Note
Certain applications will not require the mounting channels due to the contour of the bus roof.
c. Remove rooftop cover. Install the mounting rails (if
used) with the inclosed hardware. Refer to inclosed
installation drawing or see Figure 3-7.
Note
Do not tighten the mounting channel hardware
at this time. They will have to be removed later.
d. Carefully place the condenser at the predetermined
location on the bus roof. Center the condenser sideto-side on the bus roof. Determined if the mounting
channels are needed at this time. See Figure 3-8 and
Figure 3-9.
T--311
3--6
CAUTION
The Rooftop Condenser assembly must
contact the bus roof in the center. If not,
damage will occur. Consult factory as optional mounting may be required.
e. Trace around both mounting channels or condenser
mounting surface. See Figure 3-7.
f. When installing the KR4, also trace around the location where you will be attaching the feed-thru plate(s)
(See Figure 3-12 or Figure 3-13).
g. Remove mounting channels (if used) from condenser
assembly.
Note
It is recommended that a drill stop be used
when drilling through the bus roof.
CAUTION
All 3/16 and 1/4 In. rivet engagement thickness (grip range) must be between 0.080
and 0.625. Using rivets other than those
specified may allow the condenser assembly to come loose from the bus roof.
h. If using mounting channels drill (6 places each rail)
13/64 In. Dia. holes thru the bus roof skin using the
mounting channel holes as a guide. Apply sealant to
the mounting channels or bus roof. Use 3/16 In. Dia.
steel rivets to attach mounting channels to bus roof.
Drill 17/64 In. Dia. holes thru the mounting channels
and bus roof bows. Apply sealant to 1/4 In. Dia. steel
rivets and rivet to the roof bows (minimum of two rivets per roof bow). Apply sealant to the rivet heads and
around the mounting rails to prevent water leaks. Attach condenser to mounting channels using the enclosed hardware. Torque to 20 Ft. Lbs. Refer to enclosed installation drawing or see Figure 3-10.
i. If not using mounting channels, remove the condenser assembly to expose outline tracing. Apply sealant
where the condenser will be installed. Place condenser back over the outline tracings. Drill 17/64 In. Dia.
holes thru the bus roof skin (6 places each side) and
the roof bows (minimum of two rivets per roof bow).
Apply sealant to 1/4 In. Dia. steel rivets and rivet to
the roof and roof bows. Apply sealant to the rivet
heads and around the mounting rails to prevent water
leaks. Refer to enclosed installation drawing or see
Figure 3-11.
Bolt, 3/8-16 X 1-1/4 In.
4 per side.
1/4 In. steel
monobolt.
3/8 In. flat washer
3/8 In. flat washer
Sealant
Mounting channel
Bus roof outer skin
Bus roof outer skin
Roof bow
Roof bow
Without Mounting Channel
With Mounting Channel
Figure 3-7 Mounting Options
Roof Bow
Center of condenser assembly must contact bus roof
Figure 3-8 KR4 Condenser Mounted Without Mounting Channels (Front/Back View)
Mounting
Channel
Roof Bow
Center of condenser assembly must contact bus roof
Bus Roof
Figure 3-9 KR4 Condenser Mounted With Mounting Channels (Front/Back View)
Bus Roof
Roof Bow
Apply sealant to unit mounting surface
and rivet heads to prevent water leaks
Roof Bow
Figure 3-10 KR4 Condenser Mounted Without Mounting Channels (Side View)
3--7
T--311
Mounting
Channel
Apply sealant to unit mounting surface
and rivet heads to prevent water leaks
Roof Bow
Bus Roof
Roof Bow
Figure 3-11 KR4 Condenser Mounted With Mounting Channels (Side View)
j. After deciding where the feed-thru plate(s) will be located, trace around the outside edges of the plate
(See Figure 3-12 or Figure 3-13). Mark all rivet holes
in the plate.
k. Measure 1/4 inch in from the rivet holes and mark for
cut-out. Carefully cut out the feed-thru plate opening
in the bus roof and ceiling.
NOTE
Two single plates installed on both sides of the
Rooftop Condenser can be used to access
side-mounted evaporators. Single or dual access plates can be used for rear-mounted
evaporators.
Cut-Out
Area
AC301-029
Figure 3-12 Condenser Feed-Thru Plate KR4 (Single Loop)
Cut-Out
Area
AC301-082
Figure 3-13 Condenser Feed-Thru Plate KR4 (Dual Loop)
l. Drill13/64 inch holes in the bus roof using the holes in
the feed-thru plate as a guide. Drill out all holes.
m. Apply sealant around all the holes and under the
plate.
n. Using 3/16 inch rivets, attach plate(s) to the bus roof.
o. Apply sealant around the outside edge of plate(s).
T--311
3--8
p. Connect the condenser liquid and suction line assemblies to the feed-thru plate.
q. Push the condenser electrical harness through the
feed-thru plate tube. Seal around the opening.
r. After connecting refrigerant lines and condenser harness(s) install the condenser cover with hardware
provided.
s. Clean condenser cover with a mild cleaning solution
and clear all debris from the roof of the bus.
3.6 KR2 & KR3
The Carrier Transport Air Conditioning KR2/3
condensers are designed to be installed on the roof of
the bus.
To install the KR2/3 rooftop condensers utilize the
following installation procedures:
a. Select a location on the bus roof where the condenser mounting channels will span at least two roof
bows.
Note
The ideal location will be close to the evaporator
inside the bus as well as spanning two roof
bows.
b. Remove the rooftop condenser from the shipping
box.
Note
There are various styles of KR2/3 condenser
mounting brackets that are available to fit the
different contours of a bus roofs. There are also
different style feed-thru plates available depending upon if you are installing side mounted
or rear mounted evaporators. Make sure you
have the correct mounting brackets and/or
feed-thru plates befor proceeding with the
installation. Refer to T--299PL Service Parts
Manual for available plate configurations.
c. Remove rooftop cover from unit and place condenser on the center (side to side) of the bus roof at the
predetermined location.
d. Install the KR2/3 Rooftop Condenser assembly following steps h. or i. in Section 3.5. Some applications
will allow the use of bolts through the bus roof and
ceiling.
e. Mark where the feed-thru plate will be located and
cut-out so the feed-thru plate fittings will drop
through the opening.
Note
If connecting to a rear mounted evaporator, in
most cases the cut out will be through both the
bus roof and ceiling. If side mounted evaporators, the cut out will only be through the bus
roof.
f. Connect the condenser liquid and suction line assemblies to the feed-thru plate.
g. Push the condenser electrical harness through the
feed-thru plate tube. Seal around the opening.
h. After connecting refrigerant lines and condenser harness(s) install the condenser cover with hardware
provided.
i. Clean condenser cover with a mild cleaning solution
and clear all debris from the roof of the bus.
81-62145-00 Copper Tube
1.69 In. Tube Height
81-62145-01 Steel Tube
3.37 In. Tube Height
Figure 3-14 Condenser Feed-Thru Plate KR2/3
81-62138-00
2.75 In. Tube Height
81-62138-01
1.50 In. Tube Height
Figure 3-15 Condenser Feed-Thru Plate KR2/3
3--9
T--311
3.6.1 Connecting To Side-Mounted Evaporators
The preceding steps are for connecting a rooftop
condenser assembly to a rear mounted evaporator
assembly. The standard feed-thru-plate should not be
used with side mounted evaporators. Refrigerant hoses
should be routed between the inner and outer skins of
the bus ceiling and roof. When connecting to side
mounted evaporators utilize the following procedures:
Note
When drilling into the bus ceiling and pulling the
refrigerant hoses, care must be taken to remove as little insulation as possible from the
bus ceiling.
NOTE
The top and bottom condenser assemblies can
be assembled as one then installed as a complete stacked condenser assembly to the bus
stringers.
CAUTION
j. Cut 4-1/2 In hole behind the side mounted evaporator, or, if ducted system, within the duct area.
k. Use a fish-tape or wire to pull the liquid and discharge
lines up to the condenser assembly from inside the
bus.
Note
The inside cut-out must be protected with trimlock or similar material to help keep the refrigerant hoses and harness from chaffing.
l. Connect the refrigerant hoses to the feed-thru plate.
m. Apply sealant to all the rivet heads and all areas open
to the interior to prevent water leakage.
n. Route suction line from the evaporator and discharge line from the condenser per instructions provided in Section 4, Hose Routing.
Note
Connect the electrical harness that was routed
through the feed-thru plate before bolting on the
condenser cover.
o. Bolt rooftop cover on to rooftop frame with hardware
supplied.
p. Clean condenser cover with a mild cleaning solution
and clear all debris from the roof of the bus.
3.7 CM-2 AND CM-3 STACKED CONDENSER ASSEMBLIES
The Carrier Transport Air Conditioning stacked
condensers are designed to be installed in the skirt of
T--311
the bus when there is insufficient room for a standard
installations.
To install Stacked Condensers utilize the following
installation procedures:
3--10
Condenser assemblies must be properly
installed using graded hardware. The CM-2
condenser assembly requires at least 4
bolts and the CM-3 requires at least 6 bolts.
a. Install top condenser to the bus stringers (floor) as described in paragraph 3.3
b. Assemble bottom condenser assembly to the top
condenser assembly with the hardware supplied in
the appropriate (2 or 3) stacked condenser kit. Refer
to the enclosed installation drawing or Figure 3-16
and Figure 3-17.
c. Place air inlet stiffener over air inlet bracket and
loosely attach to the top condenser assembly. Repeat
on other side of assembly.
d. Loosely attach air outlet bracket to top condenser assembly. Repeat on other side of condenser assembly.
e. Attach bottom condenser assembly to top assembly
using the air inlet stiffener bracket, air outlet brackets,
and the required hardware.
f. Attach block-off plate to both air inlet brackets.
g. Slide air inlet bracket and block-off plate against the
bus skirt.
h. Tighten all bolts.
NOTE
The CM-3 Condenser assembly requires the
installation of a front bracket. See Figure 3-17.
This bracket helps to support the bottom condenser assembly.
i. Install air inlet brackets to both sides of the condenser
and the block-off plate to the bottom.
j. Install condenser screens (2) to the bus skirt.
BUS FLOOR
FLOOR MEMBER (STRINGER)
Top Condenser
CHASSIS
RAIL
Air Inlet Stiffen
Air Outlet Bracket
Air Inlet Bracket
Bottom Condenser
Bus Skirt
Figure 3-16 Stacked Condenser Assembly (Side View)
Air Inlet Bracket
Front Bracket
Air Inlet Bracket
Block-Off Plate
Figure 3-17 Stacked Condenser Assembly (Bus Skirt View)
3--11
T--311
SECTION 4
HOSE ROUTING
4.1 INTRODUCTION
CAUTION
All bus air conditioning systems use a network of
refrigerant hose and fittings to connect the major
components and carry the refrigerant gas and liquid
through the system.
Using a hose cutting tool other than the cutter supplied in the installation kit will not
guarantee a correct fit between the hose
and the Quick--Click fitting.
4.1.1 Planning
Extreme care must be used when piping a bus. Plan the
routing of the hose prior to the installation, being careful
to avoid sources of high heat and sharp edges. If the
hose is routed near any heat source it should be
protected with a heat-resistant insulation. When hoses
are run through sheet metal or other sharp parts of the
frame, the hose should be protected by grommets or
clamped off in a manner that prevents chaffing. Failure
to protect the hose may result in leaks, loss of refrigerant
and cooling, and possible compressor damage.
1. Cut the proper size hose using the hose cutter contained in the Quick--Click hose assembly kit.
Stop Angle
(Fitting Guide)
4.1.2 Service Loop
When refrigerant hoses are attached to any component,
it is highly recommended that the hoses are not pulled
tight. Use a service loop at the compressor and extra
hose at other locations to provide strain relief. This will
allow the engine and road vibration to be absorbed by
the hose and not the fittings. Failure to give strain relief
may result in leaks or fractured fittings. Do not, however,
leave the extra hose unsupported.
Figure 4--1 Quick--Click #1
2. Slide the fitting clamp onto the hose until the stop
angle contacts the hose (See Figure 4--1).
4.1.3 Dual Systems
When a bus has dual (2) systems, care must be taken to
assure that the electrical system and hose routing are
independent of each other. Connections of the piping for
one system to the electrical signals from the other may
result in failures to both systems through
miscommunication with the pressure switches. Marking
both ends of the hose assembly for identification is
recommended.
Mineral Oil
Stop Angle
(Fitting Guide)
Enlarger
Tool
4.1.4 Connection Lubrication (Mineral Oil)
System hose connections, fitting threads, and “O”
-Rings must always be lubricated with mineral oil. Never
use PAG or POE oils. Failure to lubricate the system
“O”-Rings and fitting threads or the use of an improper
lubricant may lead to torn seals, local corrosion, and
leaks.
Figure 4--2 Quick--Click #2
3. Using the enlarger tool contained in the Installation
Kit, widen the hose to prevent the O--Ring seals from
turning when installing the fitting (See Figure 4--2). It
may be necessary to lubricate the enlarger tool with
mineral oil for easier insertion.
4.2 QUICK-CLICK RESUABLE HOSE & FITTINGS
It is highly recommended that all installations be
performed using Carrier Transportation Air Conditioning
“Quick-Click” hose and fittings.
Mineral Oil
4.2.1 Assembly Instructions For Quick--Click
Resuable Hose & Fitting Connections
The Quick--Click hose assembly kit (CTAC P/N
07--60009--00) must be used to properly assemble
Quick--Click hose and fittings. The kit contains a hose
cutter (CTAC P/N 07--00383--00), an enlarger tool
(CTAC P/N 07--00384--00) and fitting pliers (CTAC P/N
07--00382--00). Replacement blades for hose cutter are
also available (CTAC P/N 07--00383--20).
Stop Angle
(Fitting Guide)
Figure 4--3 Quick_Click #3
4--1
T--311
4. Lubricate the fitting O--Rings with mineral oil. Push
the fitting into the hose until it contacts the fitting
clamp stop angle (See Figure 4--3).
Pliers
Clamp
Hose
Fitting
Figure 4--5 Quick-Click Hose (Capped)
Cutaway bus hose routing will normally be routed
through the bus floor, up the lower wall (see Figure 4--6),
and then behind the upper off-set rear wall. This type of
routing must be accomplished before the evaporator is
mounted to the bus ceiling. On some buses the hose,
harness, and drain lines can be routed (hidden) behind
the lower wall also.
Figure 4--4 Quick--Click #4
5. Using the pliers supplied in the Installation Kit, clip
the fitting clamp lugs tightly together. You will hear a
“click” when the lugs snap together. The lugs can be
unclipped by reversing the pliers action (See
Figure 4--4).
NOTE
There will be times when the hose is cold and
stiff, making it difficult to expand and insert a fitting. In this event there is a fitting insertion tool
(CTAC P/N 07--00417--00) available to aid in
the installation.
4.2.2 Barrier Type Hose & Fittings
(Not Recommended By Carrier TAC)
The setup, operation and equipment maintenance are
all critical when using this type hose & fittings. Failure to
crimp properly will result in immediate leaks or leaks that
become evident due to heat and vibration. When using
beadlock type fittings it is critical to have initial
interference between the hose inside diameter and
fitting tube outside diameter. Use of a combination that
has clearance between components will result in a
much higher probability of leaks.
Figure 4--6 Bus With Rear Seat Removed
1. Determine which side of the vehicle the hoses
should be routed; the drivers side or passenger side.
2. Determine what route the hoses will take. Take into
consideration there are going to be obstacles that
the hoses may have to be routed around, such as
seats, wheelchair lifts, windows, etc.
3. Lay out the hose cover backs in the position that they
eventually will be installed, and mark their position
(see Figure 4--7). Mark the sides and where they
stop at the floor and wall. This will give you an outline
where the holes for the hoses should be placed.
4.3 EVAPORATOR HOSE ROUTING-INSIDE THE
BUS WALL
Always keep hose capped until ready to connect to a
system component (see Figure 4--5).
T--311
4--2
Figure 4--9 Hole-Saw Cuts Joined
Repeat steps 1. through 6. to obtain access to the wall or
floor, depending which one you start with.
Figure 4--7 Hose Back Positioning
Before drilling holes for the hoses in the wall or through
the floor, make sure there are no electrical harnesses,
braces, etc. in the path of the hose routing and hole saw.
4. Drill a 3/16 inch pilot hole in the center of where you
are going to drill the two 1 1/2 inch holes. This will
show you if you can safely cut the two 1 1/2 inch
holes in the floor.
5. Drill two 1-1/2 inch holes side by side within the hose
cover markings (see Figure 4--8).
Figure 4--10 Rear Wall Access
7. Remove any sharp edges from around the holes to
prevent hose cutting and/or chaffing.
After holes are drilled, sawed and deburred, you are
ready to mount the hose cover backs using common
fasteners such as screws or pop rivets (see Figure 4--11
& Figure 4--12).
CAUTION
Figure 4--8 Hole-Saw Cuts in Floor
6. Saw out any material remaining between the two
holes, leaving an oblong hole to route the hoses
through (see Figure 4--9).
The opening in the vehicle floor must be
sealed to minimize introduction of exhaust
4--3
T--311
fumes, dust and other foreign material from
entering the passenger compartment.
CAUTION
When drilling into the vehicle wall, always
use a drill stop to help protect against damaging any wiring that might be located behind the wall.
Installation Hint
To help keep hoses, harness, and drain lines
secure and in the center of the hose covers,
3/16 inch holes can be drilled in the hose cover
backs. Insert Tie-Wraps through the holes before securing the hose cover backs to the wall
(See Figure 4--21).
8. Drill a 3 inch hole in the vehicle wall in order to rout
the hoses and harness to the evaporator area.
9. Remove (deburr) any rough edges from around the
cut-out.
Using a small piece of “Trim-Loc” or similar material
around the cut-out will help protect the hoses and
harness from chaffing and/or cutting. (See
Figure 4--13).
Figure 4--11 Hose Cover Back
Trim-Lock
Figure 4--13 Access Hole With Trim-Lock
10.Route the hoses and harness at this time.
Protection
Figure 4--14 Hoses Routed Through Access
Before fastening to the hose cover backs, protect the
hoses and harness wherever they go through the floor
or wall (see Figure 4--14 & Figure 4--15)
Figure 4--12 Hose Cover Backs On Rear Wall
T--311
4--4
Protection
X
Install Condensate Valve
(Kazoo) on Drain Line End
Figure 4--15 Hoses Routed Through Floor
A piece of scrap drain hose or heater hose, split down
the middle, can be used for protection.
11. After hoses and harness are protected, secure them
to the hose cover backs with the Tie-Wraps (See
Figure 4--19).
Figure 4--16 Incorrect Hose/Harness Routing
Rear window is partially blocked.
4--5
T--311
Figure 4--19 Hose/Harness/Drain Line Tie-Wraped
To Hose Cover Backs
Figure 4--17 Correct Hose/Harness Corner
Routing (Window Not Blocked)
Trim-Lock
Insulated Clamp
Figure 4--20 Hose/Harness Clamped to Wall
At this time the evaporator can be mounted. Refer to
Section 2 for the proper procedures for installing a rear
mounted evaporator assembly.
12.You may now make the appropriate connection to
the evaporator.
Proper hose to fitting clamping is critical. Do not attempt
to attach any hose or fitting until you have familiarized
yourself with Carrier Transport Air Conditioning
Quick-Click hose/fitting crimping procedures.
4.4 EVAPORATOR HOSE ROUTING, OUTSIDE
THE BUS WALL
The evaporator has been previously installed. Refer to
Section 2 for the proper procedures for installing a rear
mounted evaporator assembly.
Figure 4--18 Side-Mounted Routing (Top)
T--311
4--6
Always keep hose capped until ready to connect to a
system component (See Figure 4--5).
16.You may now make the appropriate connection to
the evaporator.
1. Determine which side of the vehicle the hoses
should be routed; the drivers side or passenger side.
Proper hose to fitting clamping is critical. Do not attempt
to attach any hose or fitting until you have familiarized
yourself with Carrier Transport AC’s Quick-Click
hose/fitting crimping procedures.
2. Determine what route the hoses will take. Take into
consideration there are going to be obstacles that
the hoses may have to be routed around, such as
seats, wheelchair lifts, windows, etc.
4.5 EVAPORATOR HOSE ROUTING, SIDEMOUNTED
3. Lay out the hose cover backs in the position that they
eventually will be installed, and mark their position.
Mark the sides and where they stop at the floor and
wall. This will give you an outline where the holes for
the hoses should be placed.
The side-mounted evaporator should be installed in the
desired location. Refer to Section 2 for proper
procedures for installing a side-mounted evaporator
assembly.
1. Always keep hose capped until ready to connect to a
system component.
Before drilling holes for the hoses in the wall or through
the floor, make sure there are no electrical harnesses,
braces, etc. in the path of the hose routing and hole saw.
Side mount hose cover kits are supplied with 45 degree
angle pieces and a transition to aid in routing hoses and
harnesse down the side of the bus/vehicle.
4. Drill a 3/16 inch pilot hole in the center of where you
are going to drill the two 1 1/2 inch holes. This will
show you if you can safely cut the two 1 1/2 inch
holes in the floor.
2. Select a window post nearest the evaporator to route
the hoses down. In most cases hoses will need to be
routed around seats, emergency exits, etc. Use the
45 degree angles to obtain the proper clearance.
5. Drill two 1-1/2 inch holes side by side within the hose
cover markings.
3. Lay out the hose cover backs in the position they will
eventually be installed.
6. Saw out any material remaining between the two
holes, leaving an oblong hole to route the hoses
through.
Take extra precaution when routing hoses to a side
mounted evaporator. You are restricted to a limited
amount of space to route the hose. Make sure the hoses
do not bend to the point of kinking the hose. This would
result in poor system performance and/or failure.
7. Repeat steps 1. through 6. to obtain access to the
wall or floor, depending which one you start with.
8. Remove any sharp edges from around the holes to
prevent hose cutting and/or chaffing.
4. Mark where the hose cover back meet the evaporator and the floor. This will give you an outline where
the holes for the hoses should be placed.
9. After holes are drilled, sawed and deburred, you are
ready to mount the hose cover backs using a common fastener such as screws, pop rivets, etc.
Before drilling holes for the hoses in the wall or through
the floor, make sure there are no electrical harnesses,
braces, heater lines, etc. in the path of the hose routing
and hole saw.
When drilling into the vehicle wall, always use a drill stop
to help protect against damaging any wiring that might
be located behind the wall.
On many of the larger buses there are heater hose lines
with covers running the length of the bus floor. On most
applications there is enough room inside the heater
hose covers to route the hose, harness, and drain line
behind the heater hose. Extreme care must be taken so
as not to drill into, cut, or kink the heater lines. This type
routing takes a little more time, but makes for a much
neater installation.
To help keep hoses, harness, and drain lines secure and
in the center of the hose covers, 3/16 inch holes can be
drilled in the hose cover backs. Insert Tie-Wraps
through the holes before securing the hose cover backs
to the wall (See Figure 4--21) .
10.Drill a 3 inch hole in the vehicle wall in order to rout
the hoses and harness to the evaporator area.
5. Drill a 3/16 inch pilot hole in the center of where you
are going to drill the two 1 1/2 inch holes through the
floor. This will show you if you can safely cut the two 1
1/2 inch holes through the floor.
11. Remove (deburr) any rough edges from around the
cut-out.
12.Using a small piece of “Trim-Loc” or similar material
around the cut-out will help protect the hoses and
harness from chaffing and/or cutting. See xxxx
6. Drill the two 1-1/2 inch holes side by side within the
hose cover markings.
13.Route the hoses and harness at this time.
7. Saw out any material remaining between the two
holes, leaving an oblong hole to route the hoses
through.
14.Before fastening to the hose cover backs, protect the
hoses and harness wherever they go through the
floor or wall. A piece of scrap drain hose or heater
hose, split down the middle, can be used for protection.
8. Remove any sharp edges from around the holes to
prevent hose cutting and/or chaffing.
15.After hoses and harness are protected, secure them
to the hose cover backs with the Tie-Wraps.
9. After holes are drilled, sawed and deburred, you are
ready to mount the hose cover backs using a common fastener such as screws, pop rivets, etc.
At this time the evaporator can be mounted. See
Section 2 for the proper procedures for installing a rear
mounted evaporator assembly.
When drilling into the vehicle wall, always use a drill stop
to help protect against damaging any wiring that might
be located behind the wall.
4--7
T--311
Installation Tip
To help keep hoses, harness, and drain lines
secure and in the center of the hose covers,
3/16 inch holes can be drilled in the hose cover
backs. Insert Tie-Wraps through the holes before securing the hose cover backs to the wall
(see Figure 4--21).
Figure 4--21 Metal Hose Cover Backs W/Tie-Wraps
Figure 4--22 Side-Mounted Hose/Harness Routing
4.6 CHASSIS HOSE ROUTING
Always keep hose capped until ready to connect to a
system component.
Exact routing of hose and harness in the chassis area
cannot possibly be covered in detail due to the various
manufacturers of vehicles and chassis, as well as many
different applications.
Once the hoses are routed from the evaporator area
and through the floor of the vehicle, they will have to be
routed to the condenser and compressor areas.
Before routing the hose, plan the route the hose and
harness will take, avoiding heat sources, sharp or rough
areas, moving parts, etc.
Always protect hose and harness where they cross over
the vehicle frame or any other place where they are
laying on sharp edges (see Figure 4--23 & Figure 4--25)
or are near any heat source.
Secure the hoses underneath the vehicle with insulated
“P-Clamps”. Clamps should be spaced no more than 24
inches apart. Secure the hoses and harness to the
vehicles floor supports and/or chassis frame (see
Figure 4--23 thru Figure 4--24).
10.Remove (deburr) any rough edges from around the
cut-out.
11. Route the hoses and harness at this time.
Before fastening to the hose cover backs, protect the
hoses and harness wherever they go through the bus
floor or heater cover.
A piece of scrap drain hose or heater hose, split down
the middle, can be used for protection.
12.After hoses and harness are protected, secure them
to the hose cover backs with the Tie-Wraps.
13.You may now make the appropriate hose connections to the evaporator.
Properly clamping a fitting to the refrigerant hose is very
important. Do not attempt to attach any hose or fitting
until you have familiarized yourself with Carrier
Transport Air Conditioning Quick-Click hose/fitting
clamping procedures.
T--311
4--8
Figure 4--23 Hose Routing (Chassis)
Figure 4--25 Hose Routing (Chassis)
Figure 4--24 Hose Routing (Chassis)
Figure 4--26 Hose Routing (Chassis)
Figure 4--27 Hose Routing (Chassis & Condenser)
When mounting hose in the condenser area, secure the
hose in a manner so that the weight of the hose is not on
the condenser fittings.
4.7 CONDENSER HOSE ROUTING
Always keep hose capped until ready to connect to a
system component.
4--9
T--311
Always try to leave a service loop in the hose to relieve
stress from the condenser fitting and for ease of
serviceability.
Hoses must be protected with a heat resistant insulation
when routed close to the manifold, turbo pipes, or any
other hot area of the vehicle engine.
When making condenser connections, always use
caution as you start the fitting onto the condenser.
Lubricate the fitting and “O” Ring with mineral oil before
making the connection.
Low Side Access
Secure hoses in the condenser area with insulated
P-Clamps (see Figure 4--27).
High Side Access
Properly clamping a fitting to the refrigerant hose is very
important. Do not attempt to attach any hose or fitting
until you have familiarized yourself with Carrier
Transport Air Conditioning Quick-Click hose/fitting
clamping procedures. Refer to paragraph NO TAG.
4.8 VEHICLE COMPRESSOR HOSE ROUTING
Always keep hose capped until ready to connect to a
system component.
When routing hoses in the engine area, you must use
extreme caution, due to the many heat sources, sharp
edges, and engine movement (See Figure 4--28).
Figure 4--28 Engine Routing (With High & Low
In-Line Access Fittings)
High Side Access
Clamps
Heat Shielding
Low Side Access
Figure 4--29 Hose Routing - OEM (To & From Engine)
CAUTION
CAUTION
Tie-Wraps may be used to bundle hoses
and harnesses, but should never be used to
secure hoses to the vehicle.
Never substitute fittings or hose. Follow the
piping diagram provided with the system.
When making compressor connections, always use
caution as you start the fitting onto the compressor.
Lubricate the fitting and “O” Ring with mineral oil before
making the connection.
Apply Mineral Oil to all Flare and O-Ring surfaces prior
to connecting.
Follow any special instructions on hose routing that may
have been supplied with the vehicle compressor mount
kit.
Always leave a service a loop in the hoses when
connecting to the compressor on the vehicles engine.
This will allow the hoses to flex with engine movement,
taking stress off of the compressor fittings. Failure to
relieve stress may result in fittings backing off, leaks,
and/or fitting failure.
CAUTION
No matter what type of lubricant (oil) used
in the system, always use mineral oil to lubricate the O-Rings, and fittings. PAG oils
Secure hoses with insulated Clamps whenever possible
(See Figure 4--29).
T--311
4--10
will absorb moisture and become very acidic and corrosive. Mineral oil will not absorb
moisture and thus prevent corrosion.
part of the vehicle fuel system.
Install all hoses and fittings in a manner that will not
adversely affect the fitting torque.
CAUTION
Always use existing holes in the chassis
frame. Never drill holes in the chassis
frame.
4.9 TORQUE SPECIFICATIONS - REFRIGERANT
FITTINGS
All refrigerant hose fitting connections must be torqued
to the specifications listed in Table 4-1. Fittings threads
and O-Rings must be lubricated with mineral oil, not
PAG or POE oils.
CAUTION
Never secure hoses or harnesses to any
SIZE
4
5
6
8
10
12
Table 4-1 STANDARD TORQUE REQUIREMENTS
FLARE
O-RING
THREAD **
STEEL TUBING
ALUM. TUBING
1/4 inch (.250)
11-13 ft./lbs.
30-35 ft./lbs.
5-7 ft./lbs.
7/16
3/8 inch (.375)
15-17 ft./lbs.
30-35 ft./lbs.
8-10 ft./lbs
9/16
3/8 inch (.375)
18-20 ft./lbs.
30-35 ft./lbs.
11-13 ft./lbs
5/8
1/2 inch (.500)
36-39 ft./lbs.
30-35 ft./lbs.
15-20 ft./lbs
3/4
5/8 inch (.625)
52-57 ft./lbs.
30-35 ft./lbs.
21-27 ft./lbs
7/8
3/4 inch (.750)
71-79 ft./lbs.
30-35 ft./lbs.
28-33 ft./lbs
1-1/16
* The tube O.D. is measured at the point it passes through the nut. ** Thread pitch may vary.
TUBE O.D. *
Use only approved OEM type heater hose or its
equivalent.
Use only worm-gear drive type hose clamps on heater
hose.
Never secure heater hose to the transmission dip stick
tube or on to any fuel system component.
Do not route heater hoses near sharp edges, utilize
edge guards to protect against cutting and/or chaffing.
Secure heater hoses with insulated P-clamps.
4.10 ROOFTOP CONDENSER HOSE ROUTING
(CM-7 & CM-11)
Always keep hose capped until ready to connect to a
system component.
Hoses should be routed as close to the evaporator as
possible. This will ease the routing through the roof and
to the condenser.
When making condenser connections, always use
caution as you start the fitting onto the condenser.
Lubricate the fitting and “O” Ring with mineral oil before
making the connection.
CAUTION
Properly clamping a fitting to the refrigerant hose is very
important. Do not attempt to attach any hose or fitting
until you have familiarized yourself with Carrier
Transport Air Conditioning Quick-Click hose/fitting
clamping procedures.
Tie-Wraps may be used to bundle hoses
and harnesses, but should never be used to
secure hoses to the vehicle.
The hot water supply hose should be connected to the
lowest part of the heater core.
Minimize air pockets in the system by adding an air
bleed-off device at the systems high point.
The use of a positive shut-off valve in the auxiliary hot
water supply hose is highly recommended. Any leakage
of hot water into the heater core during the air
conditioning season will adversely effect the cooling
efficiency of the air conditioning system.
4.11 AUXILIARY HEATER HOSE ROUTING
(GENERIC)
Carrier Transport Air Conditioning does not supply
heater hose for connecting to a Carrier Transport Air
Conditioning supplied heater coil.
The following general guidelines have been established
to aid in connecting an auxiliary heater coil to the
vehicles heating system.
4.12 PIPING DIAGRAMS
Always refer to the detailed piping diagrams furnished
with the system you are installing. If your specific piping
diagram is not included with your system installation kit,
contact the Carrier Transport Air Conditioning Technical
Service Hot Line (1--800-450-2211).
While all piping diagrams could not be included in this
manual, some of the more common installations have.
Change 07/09
4--11
T--311
FILTER DRIER
Figure 4-22 Rear Evaporator, OEM Tie-in
T--311
4--12
FILTER DRIER
Figure 4-23 Evaporator, Skirt Monuted Condenser and Compressor
4--13
T--311
FILTER DRIER
Figure 4-24 Evaporator, Skirt Monuted Condenser and Compressor (AC-322, -332, -442)
T--311
4--14
FILTER
DRIER
Figure 4-25 Evaporator, Skirt Monuted Condenser Compressor and Aftermarket InDash (AC-4431)
4--15
T--311
FILTER
DRIER
FILTER
DRIER
Figure 4-26 EM-3 Evaporator, (2) Skirt Monuted Condensers and TM-31 Compressor (AC-882, -883)
T--311
4--16
FILTER
DRIER
FILTER
DRIER
Figure 4-27 (1)EM-3 Evap, (1)EM-7 Evap, (2) Skirt Condensers and a TM-31 Compressor (AC-9632)
4--17
T--311
SECTION 5
ELECTRICAL
Electrical harness routing is a critical process in the
installation of any transportation air conditioning
system. Pre-planning of the electrical harness path
between components will eliminate encounters with
commonly existing conditions which could result in
electrical system failure. Following proper electrical
harness routing procedures will ensure optimum
system performance and provide for a long lasting and
trouble free installation.
5.2.3 Dual Systems
When the bus has a dual compressor system care must
be taken to ensure that the electrical system and hose
routing are independent for each side. Test and charge
one system at a time, thus ensuring each system is
functioning properly. Connecting the piping of one
system to the electrical signals from another system will
result in failures to both systems. It is highly
recommended that both ends of the bus harness/cable
assemblies be marked for ease of identification.
5.2 SYSTEM WIRING
5.3 VOLTAGES
5.2.1 Electrical Kits
Carrier Transport Air Conditioning components are
designed to operate efficiently at 12.5 or 25 volts. For
continued proper operation, all components must have
a proper voltage supply, even during low idle. After at
least 15 minutes of operation, with all accessories and
the air conditioning system(s) on, check the voltage at
the evaporator, condenser, and the compressor.
Voltages less than 12 volts will cause the condenser and
evaporator fans to run slower, resulting in a pressure
build-up, excess heat, and compressor failure. Less
than 12 volts at the compressor may cause clutch
slippage.
Always be sure that the voltages you are working with is
compatible with the air conditioning system you are
going to install (12 Volt--24 Volt).
5.1 INTRODUCTION
The electrical kits provided with Carrier Transport Air
Conditioning systems contain the harnesses/cables
and components necessary to safely connect the air
conditioning to the vehicle power source and
communicate signals between components.
Review the wiring diagram to insure that the kit provided
is the proper wiring kit for your air conditioning system.
NOTE
Wiring diagrams may not always be supplied.
contact the Carrier Transport Air Conditioning
Technical Service Hot Line (1--800-450-2211)
for assistance.
5.4 COMPONENT CONNECTIONS
Separate harnesses/cables and route to their
appropriate components. Whenever possible route the
harness/cable with the corresponding components
refrigerant hoses.
The evaporator, condenser and drivers control panel
are pre-wired and are supplied with a short length of
harness (pig-tail). Connect the color wires from the
appropriate harness/cable to the component (pig-tail)
butt connectors (see Figure 5-1).
5.2.2 Protection
Extreme care must be used when wiring a bus. Plan the
routing of the harness prior to installation, being careful
to avoid sources of high heat and sharp edges. If the
wiring is near any heat source it must be shielded with a
heat resistant insulation. When running the harnesses
through sheet metal or other sharp parts of the vehicle
frame the wires must be protected by grommets or tied
off in a manner that prevents chaffing. Where ever
possible the harness should be routed with the
refrigerant hoses (refer to section 4, Hose Routing).
Failure to protect the air conditioning wiring may result in
wiring shorts and system malfunctions.
Evaporator
Harness/Cable
Evaporator
Pig-Tail
Most electrical components are sensitive to heat and
environmental conditions. If at all possible they should
be located in a protected area. All exposed electrical
terminals (connectors) should be coated with an
electrical protectant. Circuit breakers should always be
present and located no further than 24 inches (2 feet)
from the vehicles power source or battery. Failure to
follow these precautions could lead to system failure or
in extreme conditions an electrical short-circuit which
could cause a fire.
5.4.1 Evaporator Chassis Ground, Gen 4 (Excel)
After connecting to the evaporator assembly pig-tail and
before routing to the electrical control panel, the
evaporator must be grounded to the vehicle chassis as
follows:
All connections must be tight and secure. When any
electrical connection is exposed to the elements it
should be coated with an electrical protectant. Ensure a
solid electrical ground to the vehicle chassis. Failure to
ensure tight, protected connections could cause loss of
power to a component resulting in system failure.
Note
The ground should be as close to the evaporator as possible. Insure that the ring terminal is
grounded to bare metal and coated with an
electrical protectant.
Change 07/09
Figure 5-1 Harness & Pig-Tail Connections
5--1
T--311
a. Carefully make an 8 Inch incision in the evaporator
cable close to where you will attach the ground wire
terminal.
5.4.2 Evaporator Chassis Ground, Gen 5
Gen 5 evaporators are supplied with a 12 foot section of
green, 10 or 6 gauge wire, depending on the evaporator
assembly. One end of the green grounding wire will have
a #10 ring terminal crimped to it. Securely attach this
end to the evaporator assembly top panel. The other
end of the wire will have a 1/4 inch ring terminal
tie-wrapped to it. Cut the ground wire to desired length,
strip off the insulation, and crimp the 1/4 inch ring
terminal to the wire. The evaporator must then be
grounded to the chassis rail as shown in Figure 5-2/
Figure 5-3 or to the metal frame of the bus roof.
b. Locate the green #10 wire from within the harness/
cable.
c. Cut the green #10 wire and pull from the cable.
d. Strip insulation from wire end and install a 1/4 inch
ring terminal.
e. Remove undercoating or paint from area where
ground will be attached.
5.5 CONTROLS
f. Securely attach the ground wire terminal with self tapping hardware or bolt (See Figure 5-2 & Figure 5-3).
One of two control systems may be provided. A Manual
Control Package or a Total Control Package.
5.5.1 Manual controls
If Manual Controls are provided, the controls may be
mounted in a panel (Figure 5-4), without the panel
(Figure 5-5), or as a dual system (Figure 5-6). The
manual controls must be located within easy reach of
the driver. The Drivers Controls consists of an
evaporator fan speed switch (three speed or variable)
and an adjustable thermostat.
g. Close incision in the cable with electrical tape.
Incision closed with
electrical tape
Ground
NOTE
The Ambient Air Sensor (see Figure 5-4) must
be located within the vehicle’s interior in order to
sense the return air temperature.
Insulated Clamp
4.
3.
2.
Figure 5-2 Grounded to Clamp
Remove undercoating
secure to bare metal
5.
1.
2.
3.
4.
5.
1.
Control Panel Housing
Nameplate (Switch Mounting)
Thermostat Control Switch
Fan Speed Switch (3 Speed or Variable)
Ambient Air Sensor (Thermostat)
Figure 5-4 Drivers Control Panel
Figure 5-3 Grounded to Chassis Rail
h. Coat the terminal connection and hardware with an
electrical protectant.
Route other ends of harnesses/cables to the electrical
control panel, which should be in a protected location.
Cut excess harness/cable. Strip harness wires and
attach terminal rings. Connect to the appropriate
terminal strip number on the electrical control panel
(refer to your enclosed system wiring diagram).
T--311
Figure 5-5 Controls Mounted Without Panel
5--2
Figure 5-6 Drivers Control Panel (Dual Systems)
When wiring is routed through the bus fire-wall the
cables muste be protected from the sharp edges of the
cut-out hole. Use a plastic or rubber grommet and seal
the area around the opening (See Figure 5-8).
5.5.2 Electrical Control Panel
The manual controls are wired to the electrical control
panel (See Figure 5-7 - Figure 5-9 - Figure 5-10) The
panel contains relays and circuit breakers used for
system control. It must be located in an area that is
protected from heat, moisture, dirt, and road hazards.
1.
2.
3.
4.
5.
6.
1..
2..
3..
4..
5..
6..
High Speed Relay
Condenser Relay
Compressor Clutch Relay
Circuit Breaker (HSR)
Circuit Breaker (CR)
Circuit Breaker (Ignition)
Figure 5-7 Electrical Control Panel (Typical)
Figure 5-8 Electrical Control Cables Thru Fire
Wall To Electrical Control Panel
5--3
T--311
Mounting Screw
Mounting Screw
Figure 5-9 Relay Boards Installed Inside Bus (Dual System)
To aid you in properly mounting the electrical panel
hole (See Figure 5-9). After installing the relay board,
using the pre-punched mounting holes it will be easier if
carefully place the MSR back into its connector.
you remove the MSR relay that is blocking the mounting
Figure 5-10 Wired Relay Boards (Dual System)
5.5.3 Electrical Control Panel - Torque Values
Torque values for all Split-System electrical panels are
as follows.
1. Torque value for wire connections at the plastic circuit
breakers are: 24 In-Lbs max.
2. Plastic Breaker mounting screw torque is:15 In-Lbs.
3. Torque value for wire connections at the plastic terminal strip are: 25 In-Lbs max.
4. Terminal Strip mounting screws are: 25 In-Lbs max.
Figure 5-11 Relay Boards Inside Dash Panel
T--311
5--4
located in an area that is protected from heat, moisture
and road hazards.
Care must be taken when routing the return air sensor
(thermistor) cable and the cab command cable. Both
these cables can be damaged easily if pulled across
rough or sharp areas of the bus chassis or A/C system.
5.6 TOTAL CONTROL
The Total Control system consists of a Key Pad Display
(Figure 5-12), an Electrical Control Panel, (Figure 5-13)
and inter connecting wiring. The Key Pad Display must
be located within easy reach of the vehicle operator.
12.
1.
5.
6.
7.
8.
2.
3.
11.
1.
4.
10.
5.
9.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
8.
7.
4.
6.
Display
Green LED, Cool Mode
Red LED, Heat Mode
Red LED, Flash, Alarm
ON Button
OFF Button
Increase Selection
SET Button
Decrease Selection
Fan Speed Button
Green LED, Inside Temperature
Green LED, Set Point
Total Control Mounting Assembly
3.
2.
Figure 5-13 Total Control Electrical Panel (Typical)
1.
Logic Module (Speed Control)
2.
Fuse (5 Amp
3.
Circuit Breaker (Condenser)
4.
Circuit Breaker (High Speed)
5.
Clutch relay
6.
Relay Filter - PWM (Pulse Width Modulation)
7.
Condenser Relay
8.
High Speed Relay
NOTE
A completely wired Gen 5 dual system total
control is shown in Figure 5-14. Notice that the
system control panels are labeled front and
rear. They can also be labeled left or right if side
mounted evaporators are used. A easily removable cover was also fabricated for this installation.
Figure 5-12 Total Control Key Pad/Display
5.6.1 Total Control Electrical Control Panel
The key pad/display is wired to the Total Control
electronic control panel (lFigure 5-13). The panel
contains relays,
circuit breakers,
and the
microprocessor used for system control. It must be
5--5
T--311
Figure 5-14 Gen 5 Total Control (Dual System)
5.7 OPERATING INSTRUCTIONS
running, start the engine. For complete operating
instructions refer to operation and service manual T-299
Before attempting to operate the system, power must
Split-Systems.
be available from the vehicle battery. If the engine is not
T--311
5--6
SECTION 6
MOUNT KITS AND COMPRESSORS
6.1 INTRODUCTION
Carrier transport Air Conditioning offers a wide range of
compressors and corresponding mount kits for most
engine-chassis combinations. Carrier Transport Air
Conditioning mount kits are engineered to allow precise
alignment and belt tensioning adjustments.
If system is a “Tie-In” to factory dash air, the refrigerant
must be removed with an EPA approved recovery machine. This recovered refrigerant should then be recycled and reused.
The mount and drive kit normally will contain the
mounts, hardware, pulleys, belts, idlers, etc. necessary
to safely mount the compressor to the bus engine.
Note
When the OEM radiator condenser is disconnected (not used), it is recommended by Carrier
Transport Air Conditioning that it be removed
from the vehicle.
Read and follow the installation instructions supplied
with each mount kit. Always check the Rev. number on
the drawing to determine if there have been any
changes to the mount kit since your last installation.
Minor modifications are occasionally necessary and are
considered part of the installation process. These
mount and drive kits are designed to fit vehicles with
standard equipment. The addition of special or optional
equipment may interfere with the normal installation.
It is important that the compressor have a solid mount
with no stress. The spacing between the compressor
mounting ears and the compressor mount may vary
slightly due to the manufacturing tolerances. Use shims
to close any gap between the compressor ears and
mount, before tightening the compressor mounting
bolts.
Always check pulley and belt alignment and shim as
necessary. Failure to align can cause premature wear,
belt squeal, and vibration. Use a straight edge to determine proper pulley and belt alignment before securing
the mounting hardware (Refer to paragraph 6.3).
Always torque to the specifications noted on each
mount kit installation instructions. Refer to Figure 6-2
through Figure 6-3 for torque specifications not noted
on the installation drawing.
When a non-permanent or permanent thread-lock is
supplied with the mount kit, use where and how specified per the mount kit installation instructions.
Following established mount and drive installation procedures will enure proper belt alignment and tensioning,
which in turn will promote long belt life and optimum system performance.
6.2 INSTALLATION
Utilize the following procedures when installing a Carrier
Transport Air Conditioning mount kit and compressor:
a. Unpack and inspect components for damage.
b. Insure the mount kit will fit the engine assembly.
c. Lay out all brackets, pulleys, hardware, etc. and identify using the enclosed packing list.
d. If alterations to engine heater hose is necessary,
drain coolant. Save coolant for later use.
e. Disconnect negative battery cable.
f. Follow the mount kit sequence instructions when
installing the weldments, brackets, etc., making sure
all bolts are tight, and the correct washers are used.
g. Use thread-lock whenever noted, and torque bolts to
specifications listed on drawing. Refer to Figure 6-2
through Figure 6-3 for torque specifications not noted
on the installation drawing.
Note
Never substitute the graded hardware that is
supplied with the mount kit.
Some installations may require a slight modification or
rearrangement of the radiator mounting, turbo tubes,
fuel lines, reservoirs, water lines, harnesses, or the oil fill
tube for proper clearance.
Note
Never use an air impact tool to tighten bolts on a
mount or compressor. Use a torque wrench.
On some applications it may be necessary to install the
refrigerant hose and fittings to the auxiliary compressor
before mounting and securing.
Note
Always use every bracket, support, and stiffener furnished with the kit.
6--1
T--311
6.2.1 Torque Specifications - Bolts
Always torque to the specifications noted on each
mount kit installation instructions. The torque values
listed in Figure 6-2 and Figure 6-3 are based on the use
of lubricated threads.
Bolt Size
Dia. mm
Torque
(Ft-Lb
Cast Iron
Grade 8.8
6
7
8
10
12
14
16
7
10
18
30
55
85
130
6.2.2 Torque Specifications - Split System ELectrical Panels
a. Circuit Breaker (Plastic) - 24 Inch-Pounds - max
Breaker Mounting Screws - 15 Inch-Pounds
b. Terminal Strip (Plastic) - 25 Inch Pounds - max
Terminal Strip Mounting Screws - 25 Inch Pounds
Torque
Torque
(Ft-Lb
(Ft-Lb
Cast Iron
Cast Iron
Grade 10.9 Grade 12.9
9
13
23
45
75
120
175
6.3 DRIVE BELT INSTALLATION
9
18
27
50
95
145
210
6.3.1 Introduction
There are several factors that have major effects on
compressor and alternator drive belt(s) life expectancy
and reliability. Belt alignment and proper tension being
the most critical and controllable by the installer and
end-user. Improper alignment and/or tension will cause
premature failure of drive belts, driven components as
well as a possible safety issue. When improperly
installed and/or maintained, drive belts can cause
significant damage to equipment as well as service
personnel. This document will act as a guideline for
proper installation instruction as well as continuous
maintenance guidelines which when followed insures
years of trouble free service. The following are the
biggest factors that effect belt life and system
dependability.
Figure 6-1 Metric Torque Specs
Commercial Grade Head Markings
Metric Bolts
8.8
10.9
12.9
Grade 8.8
Grade 10.9
Grade 12.9
A.
B.
1.
2.
C.
D.
E.
F.
Figure 6-2 Metric Bolt Markings
Bolt Size
Dia. mm
Torque
(Ft-Lb)
Cast Iron
Grade 2
Torque
(Ft-Lb
Cast Iron
Grade 5
Torque
(Ft-Lb
Cast Iron
Grade 8
1/4-20
5/16-18
3/8-16
7/16-14
7/16-20
1/2-13
1/2-20
5/8-11
5/8-18
5
10
18
30
32
45
50
82
93
7
15
30
45
50
70
75
135
155
11
22
40
65
70
95
110
190
215
Belt Alignment
Belt Tension
Over Tensioned
Under Tensioned
Belt Clearance
Temperature-Heat
Fluids
Maintenance Procedures
This document acts as a guide only. This document will
not replace proper installation training and/or
experience required for Carrier A/C Certification. As
always, take special caution when working with running
engines and drive belts. Safety glasses or goggles must
be worn at all times. Loose clothing is also extremely
dangerous around moving pulleys and belts.
Figure 6-3 U.S.S. Torque Specs
For questions or concerns not covered here, please feel
free to contact the Carrier Transport Air Conditioning
Technical Service Hot Line (1--800-450-2211).
Commercial Grade Head Markings
U.S. Customary Bolts
6.3.2 Belt Clearance
Grade 2
Grade 5
A certain belt clearance needs to be provided for belt
span vibration when installing compressors and
alternator belts. Figure 6-5 shows the recommended
clearance guidelines for preliminary layout work. Due to
the large number of variables, actual testing is required
to determine whether the clearances are acceptable.
Grade 8
Figure 6-4 U.S.S. Bolt Markings
T--311
6--2
Change 07/09
Clearance at Mid Span
Clearance Zone Identification
Figure 6-5 Belt Clearance Requirements
Parallel adjustment is designed into a mount for final
alignment during the installation process. This is
Correct belt alignment is essential for alternator and
necessary due to manufacturing and engine tolerances
compressor belt life. The center line of all pulleys related
as well as multiple applications and different engine
to compressor or alternator drive must be within 1/3
options available. Parallel misalignment is corrected by
degree of true center. Refer to Figure 6-6 for
moving the driven pulley (alternator or compressor) into
approximate measurements, and keep in mind, these
alignment with the drive pulley. This can be done using
are maximum values. You should try to attain perfect
several methods. Spacing the component forward or
alignment whenever possible to maximize component
rearward by adding or removing spacers is the most
and belt life.
popular method used to achieve proper alignment.
Other methods such as sliding the component forward
Maximum allowable run-out for Poly ”V” belts is 1/8 inch.
or rearwards using slide plates and/or slots in the main
Maximum allowable run-out for Standard ”V” belts is 1/4
weldment are also used.
inch.
Angular misalignment is often caused by tolerances in
several pieces, such as hardware to mounting holes and
Methods and tools used in determining proper
plates to components. This could also be from a poorly
alignment are illustrated in Figure 6-6 and Figure 6-7. A
built design and/or installed bracket. Excessive
high quality straight edge is a necessity, your eye is not
modifications such as grinding or drilling holes to a
an acceptable method of determining proper belt
larger diameter to apply/install a kit should be avoided
alignment. Precision Tools make a line of straight edges
when possible. Minimizing tolerances must be
that would be suitable for compressor and alternator
considered during the design process to minimize this
alignment purposes. Other alternatives are available
problem. Angular misalignment is corrected by
please contact the Carrier Transport Air Conditioning
loosening the mounting hardware, adjusting the
Technical Service Hot Line (1--800-450-2211) with any
compressor to the proper angle and retightening the
questions or comments. All mounting brackets should
mounting hardware.
allow for minor belt center line adjustments.
6.3.3 Pulley Alignment
Correct
Incorrect
Figure 6-7 Straight-Edge Application
Parallel
Misalignment
Proper use of a straight edge is illustrated in Figure 6-7 .
Never use a straight edge on the wide/flat side, as they
are not accurate. The thin edge is a straight surface and
the only accurate surface. The straight edge must be
flush across the face of the pulley. Then, to measure the
alignment, lower the other end down to the driven
pulley(s). Adjustments are made based on results of the
aforementioned. Note that the pulley rim width must be
Angular
Misalignment
Figure 6-6 Belt Misalignment
Change 07/09
6--3
T--311
considered when
measurements.
making
the
aforementioned
Proper belt tension is obtained by referring to Figure 6-8
. Find the belt used and where applied (compressor or
alternator drive, Single ”V” or Poly ”V” 4-8 ribs).
The next step is to lay the straight edge flush across the
face of the driven pulley. This is the best way to
determine angular misalignment. Again, adjust as
required. You should repeat this step for all pulleys until
acceptable alignment is achieved. Note the drive pulley
is the primary guide for alignment. Do not use idlers as a
guide for proper component belt alignment as bearing
play could give you false readings.
6.3.4
Notice that new belt tension is higher than in-service or
re-tension amount. All new belts require a run-in period.
During this period, a new belt will stretch more in a 10
hour run time than the entire life of the belt. So it is
important to recheck belt tension after run-in or
re-tension new belts if less than re-tension amount
prescribed above. You should check belt tension with
the belt ”hot.” However, the belt must be allowed to cool
before re-tensioning. Drives which incorporate
automatic tensioners do not require a run-in period or
re-tensioning.
Drive Belt Tension-Guidelines
Proper belt tension is essential for not only belt life, but
also the alternator and compressor life as well. Heat is a
major enemy of compressors and alternators that can
cause unnecessary stress and greatly reduce
component life.
6.3.5 Measuring Methods for Belt Tension
There are several methods and tools available for
determining belt tension. The industry’s acceptable
method would be to use a belt tension gauge as
manufactured by Kent-Moore or approved equal (CTD
Part Numbers 07-00203-00 for non-cogged V-belts &
07-00253-00 for Poly-V’s). There are also several other
models available than can be used. Please follow
manufacturer guidelines regarding gauge selection
operation and calibration requirements. You must get
the correct tension gauge for your specific belt type(s).
Listed in Figure 6-8 are the examples specific to belt
tension concerns:
A. Under tension would promote belt slippage causing
excessive heat. Heat equals premature alternator
and/or compressor failure.
B. Over tension could cause premature bearing failure
and excessive wear on drive and driven components.
Drive
Belt Top Width
New Belt
Lbs. Tension
Re-Tension
Lbs. Tension
Re-Tension
Threshold
Alternator
All
110
90
70
Compressor
All
130
105
80
Poly-Rib Belt
& Serpentine Drive
6 or More Ribs
145
105
90
Figure 6-8 Belt Tension Guide
6.4 COMPRESSOR INSTALLATION
6.4.1 Installation Position
The compressor should be installed on the vehicle
within the range shown in Figure 6-9. If installed outside
the range shown in Figure 6-9 the compressor will be
adversely affected. Most split system compressors are
equipped with a pressure feed lubrication system which
cannot function properly if the compressor is installed
outside this range. As a precaution, it is recommended
that once the compressor is mounted in its proper and
final position, the compressor clutch is turned over by
hand at least 10 revolutions before installation of the
drive belt up to the pulley. If this is not done before the
compressor is put into service, damage to the compressor valves can result from oil slugging. This is not covered under warranty.
6.4.2 Installation Precautions
The new compressor is (should be) filled with the specific quantity of compressor oil and nitrogen gas. When
mounting the compressor on the vehicle, take the following steps:
T--311
a. Loosen the discharge side connector’s cap and gently release the nitrogen from compressor. Take care
not to let oil escape.
b. Slowly rotate the compressor’s magnetic clutch several times by hand to distribute the oil which has
settled in the cylinders.
c. When replacing the compressor on a system, the
compressor should be installed after adjusting the
amount of oil. (Refer to T-299 Operation and service Split Systems) When installing the compressor on a
new system, be sure to follow factory guidelines.
6.4.3 Mounting Compressors
Clearance between the compressor mounting supports
(ears) and its bracket must be less than 0.004 inches
(0.10mm). Use shims as necessary to adjust this clearance. This will reduce the stress on the compressor
which can cause components to fail. Be sure to maintain
proper pulley alignment for the drive belt.
It is important that the compressor be mounted properly
when installed (See Figure 6-9). The side to side mounting angle of the compressor must remain ± 45° from the
horizontal. The forward to backward angle must be within ±10° of horizontal.
6--4
Note
The side to side mounting angle of the A-6 compressor must remain ±15° from the horizontal
(See Figure 6-9).
Access to the air conditioning service ports will vary. If
access cannot be made at the compressor, in-line service ports must be installed as close to the compressor
as possible.
Special care must be used when routing the suction and
discharge hoses through the engine compartment.
These hoses must be kept away from sharp objects and
hot areas of the engine. Damage to the refrigerant
hoses and leaks may occur. The hot areas can also reduce capacity by adding heat into the refrigerant inside
the hoses. This added heat must then be rejected by the
condensing coil. Since each coil has a limited ability to
reject heat, that kind of extra heat simply means less
cooling inside the bus where it is needed.
6.4.4 Oil Charge
Each compressor comes with a standard charge of oil
inside. This quantity of oil is enough to supply the compressor lubrication when installed into an already “oil
wet” system. New systems require an extra quantity of
oil be added to “wet” all interior surfaces of the system.
Refer to Section 8, Charging Procedures, for the
approximate refrigerant and oil amounts.
CAUTION
Verify that the oil added to the air conditioning system is the same oil that is in the compressor. The mixing of incompatible oils
will damage your system.
Refer to Section 7 for evacuation, Section 9 for leak
checking, and Section 8 for charging procedures. Refer
to Section 4 for hose routing.
45°
90°
S
D
10°
10°
15°
15°
10°
A--6 COMPRESSOR
10°
SIDE TO SIDE ANGLE
FRONT TO REAR ANGLE
Figure 6-9 Compressor Mounting Angles
6--5
T--311
SECTION 7
EVACUATION
11 Vacuum Pump - Air and moisture are removed
from the system by inducing a vacuum through the use
of a vacuum pump. Carrier Transport Air Conditioning
recommends a 5 CFM or larger vacuum pump for
optimum evacuation in the shortest time. A vacuum,
which is measured in microns, results when pressure is
reduced within the system. Functionally, reducing the
pressure results in reducing the boiling point of water
(moisture) that may be in the system. Through the
process of vaporization, the water (moisture) changes
state from a liquid to a vapor and is drawn off by the
vacuum pump and removed from the system. If properly
completed, the system is now ready for charging.
7.1 INTRODUCTION
The process of evacuation is an important step in the
servicing and maintenance of any air conditioning
system. The purpose of evacuation is to remove all air
and moisture from the system in preparation for adding
refrigerant and oil during the charging process. It is
imperative that all air and moisture be removed from the
system, as their presence is detrimental and will
negatively affect performance and longevity of the
systems components. Air remaining in the air
conditioning system will degrade the systems cooling
performance, while any moisture remaining in the
system is both non-condensable and a basis for acid
formation. Moisture is the deadly enemy of refrigeration
systems.
NOTE
Using a compound gauge (Low Side Gauge) for
determination of vacum level is not recommended because of its inherent inaccuracy. A
micron gauge must always be used to insure a
proper evacuation.
7.2 REFRIGERANT SERVICE TOOLS
The following equipment is essential when performing
an installation of or servicing of any Carrier Transport Air
Conditioning system. Refer to Figure 7-2 for service
component connections.
7.2.1 Preparation
a. Evacuate and dehydrate only after pressure leak test.
(Refer to paragraph 9.2 .)
b. Essential tools to properly evacuate and dehydrate
any system include a vacuum pump (5 cfm=8 m3/hr)
volume displacement) and an electronic vacuum (micron) gauge. (The pump is available from Carrier
Transicold, P/N 07-00176-11.)
c. If possible, keep the ambient temperature above
60_F (15.6_C) to speed evaporation of moisture. If
the ambient temperature is lower than 60_F
(15.6_C), ice might form before moisture removal is
complete. Heat lamps or alternate sources of heat
may be used to raise the system temperature.
7.2.2 Procedure - Complete system
a. Remove all refrigerant using an approved refrigerant
recovery system, following manufacturers recommendations.
b. The recommended method to evacuate and dehydrate the system is to connect two evacuation hoses
(see Figure 7-2) to the vacuum pump and refrigeration system. Be sure the service hoses are suited for
evacuation purposes.
c. Test the evacuation setup for leaks by drawing a deep
vacuum through the manifold gauge set, hoses, and
service couplers with the vacuum pump. Shut off the
pump and check to see if the vacuum holds. Repair
leaks if necessary.
d. Open the vacuum pump and electronic vacuum (micron) gauge valves, if they are not already open. Start
the vacuum pump. Evacuate unit until the electronic
vacuum gauge indicates 2000 microns. Close the
electronic vacuum gauge and vacuum pump valves.
Shut off the vacuum pump. Wait a few minutes to be
sure the vacuum holds.
e. Break the vacuum with clean dry refrigerant 134a
gas. Raise system pressure to approximately 2 psig
(0.2 kg/cm@), monitoring it with the compound gauge.
f. Remove refrigerant using a refrigerant recovery system.
1 Manifold Gauge Set - Provides access to and
monitors pressures within the system. Manifold Gauge
Sets are available in different configurations and styles.
3-way or 4-way, Liquid filled, with or without a sight
glass, 3 hoses or 4 hoses, 1/4 inch or 3/8 inch manifold
connections, etc. All are acceptable for servicing a
Carrier Transport Air Conditioning system. Familiarize
yourself with the proper operation of your Manifold
Gauge Set before attempting any service.
2 R134a Low Side (Suction) Coupler - Connects
the air conditioning system Suction Access Port to the
Manifold Gauge Set.
3 Ri34a High Side (Discharge) Coupler - Connects
the air conditioning system Discharge Access Port to
the Manifold Gauge Set.
4 Vacuum Pump - 2 Stage (5 CFM Minimum) Removes moisture and air from the air conditioning
system in order to obtain required micron level.
5 Micron Gauge - Monitors the evacuation process
in units of microns. Micron gauges can be either digital
(electronic) or analog. When the Micron Gauge is used
as specified by the manufacturer you can be assured all
contaminants have been removed from the air
conditioning system. Proper use of the Micron Gauge
will also serve as a first indication of a leak tight system.
6 Recovery/Recycle Machine (R134a) - Recovers
and Recycles R134a refrigerant that is present within
the air conditioning system.
7 Refrigerant Scale - Accurately weighs the transfer
of refrigerant into the air conditioning system.
8
Refrigerant Cylinder - Storage tank for R134a.
9 Heat Blanket - Used to increase internal
temperature of the refrigerant cylinder, greatly
increasing the transfer of refrigerant to the air
conditioning system.
10 Oil Injector - Used to add additional amounts of oil
to a closed system.
7--1
T--311
g. Repeat steps d.and e. one time.
h. Evacuate unit to 500 microns. Close the electronic
vacuum gauge and vacuum pump valves. Shut off the
vacuum pump. Wait five minutes to see if vacuum
holds. This procedure checks for residual moisture
and/or leaks.
3. Connect the low side field service coupling to the
suction service valve port.
4. Turn the low side field service coupling knob (blue)
clockwise, which will open the low side of the system
to the gauge set.
i. With a vacuum still in the unit, the refrigerant charge
may be drawn into the system from a refrigerant container on weight scales.
CAUTION
To prevent trapping liquid refrigerant in the
manifold gauge set be sure set is brought to
suction pressure before disconnecting.
7.3 INSTALLING MANIFOLD GAUGES
The manifold gauge set is used to determine system
operating pressures, add refrigerant charge, and to
equalize or evacuate the system.
When the suction pressure hand valve is frontseated
(turned all the way in), the suction (low) pressure can be
checked. When the discharge pressure hand valve is
frontseated, the discharge (high) pressure can be
checked. When both valves are open (turned
counter-clockwise all the way out), high pressure vapor
will flow into the low side. When the suction pressure
valve is open and the discharge pressure valve shut, the
system can be charged. Oil can also be added to the
system.
SUCTION
PRESSURE
GAUGE
CLOSED
(Frontseated)
HAND VALVE
OPENED
(Backseated )
HAND VALVE
A R-134a manifold gauge/hose set with self-sealing
hoses is required for service of the models covered
within this manual. The manifold gauge/hose set is
available from Carrier Transicold. (Carrier Transicold
P/N 07-00294-00, which includes items 1 through 6. To
perform service using the manifold gage/hose set, do
the following:
2
To Low Side
Access Valve
3
BLUE
a. Preparing Manifold Gauge/Hose Set For Use
2. Back seat (turn counterclockwise ) both field service
couplings (see Figure 7-1) and midseat both hand
valves.
4
4. Evacuate to 10 inches of vacuum.
1.
2.
3.
.
4.
5.
6.
5 Connect yellow line to R134a cylinder, purge line,
then charge with to a slightly positive pressure of 0.1
kg/cm@ (1.0 psig).
6. Front seat both manifold gauge set valves and disconnect from cylinder. The gauge set is now ready
for use.
T--311
3
YELLOW 4
5
Red Knob
Manifold Gauge Set
Hose Fitting (0.5-16 Acme)
Refrigeration and/or Evacuation Hose
(SAE J2196/R-134a)
Hose Fitting w/O-ring (M14 x 1.5)
High Side Field Service Coupling
Low Side Field Service Coupling
Figure 7-1 Manifold Gauge Set
b. Connecting Manifold Gauge/Hose Set
2. Turn the high side field service coupling knob (red)
clockwise, which will open the high side of the system to the gauge set.
2
6
Blue Knob
3. Connect the yellow hose to a vacuum pump.
1. Connect the high side field service coupling to the
discharge line service valve port.
To High Side
Access Valve
3
RED
1. If the manifold gauge/hose set is new or was
exposed to the atmosphere it will need to be evacuated to remove contaminants and air as follows:
Connection of the manifold gauge/hose set (see
Figure 7-2) is dependent on the type system being
serviced. The center hose connection is brought to the
tool being used. To connect the manifold gauge/hose
set, do the following.
DISCHARGE
PRESSURE
GAUGE
1
c. Removing the Manifold Gauge Set
1. Midseat both hand valves on the manifold gauge set
and allow the pressure in the manifold gauge set to
be drawn down to suction pressure. This returns any
liquid that may be in the high side hose to the system.
2. Backseat both field service couplings and frontseat
both manifold set valves. Remove the couplings
from the service ports.
3. Install both service port caps (finger-tight only).
7--2
LPS
(New Location GEN 5)
TXV
EVAPORATOR COIL
SUCTION ACCESS
SIGHT GLASS
7
6
FILTER DRYER
RECEIVER DRIER
DISCHARGE
ACCESS
HPS
MICRO CHANNEL
(GEN 4
Location)
HPS
LPS
CONDENSER COIL
COMPRESSOR
S
D
3
5
2
4
1.
2.
3.
4.
Vacuum Pump
Micron Gauge
Manifold Gauge Set
Refrigerant Cylinder
5.
6.
7.
1
Recovery/Recycle Machine
R134a High (Discharge) Side Coupler
R134a Low (Suction) Side Coupler
Figure 7-2 Refrigerant Service Connections (Split Systems)
7--3
T--311
SECTION 8
CHARGING PROCEDURES
8.1.2 . Proper Oil Charge
8.1 INTRODUCTION
Accurate charge levels of oil with the refrigerant are also
critical to proper performance and component longevity.
A system undercharged with oil will result in reduced
compressor life due to lack of lubrication. A system
overcharged with oil will experience poor system
performance due to reduced thermal transfer
capabilities. Refer to Table 8-1 or Table 8-2 for the
approximate oil amounts. Refer to Table 8-4 for the
correct compressor oil type.
Charging is the process of calculating and then
introducing the correct amounts of refrigerant and oil
into the air conditioning system. Accurate charge levels
will result in optimum system performance and insure
the longevity of the system components.
8.1.1 . Proper R134a Charge
A system overcharged with refrigerant operates under
high head pressure which can damage components. A
system undercharged with refrigerant will result in poor
system performance.
8.1.3 . Liquid Charging
The practice of charging liquid refrigerant into the
suction side with the compressor running will damage or
destroy the compressor, as the liquid is not
compressible.
NOTE
An overcharged or undercharged system may
contribute to system compressor failure.
8.1.4 . PAG And POE Oils
It is very important to use the lubricant type specified by
the compressor manufacturer. (Refer to Table 8-4).
Using oil other than the specified oil can result in
reduced performance and a reduction in compressor
life.
Calculations for determining the proper refrigerant
charge are based on component capabilities and liquid
line lengths as indicated on Carrier Transport Air
Conditioning charging tables. Refer to Table 8-1 or
Table 8-2 for the approximate refrigerant charge. Refer
to Table 8-5 to determine the exact refrigerant charge.
NOTE
Using oil other than that specified in Table 8-4
will void the compressor warranty.
Table 8-1 SPLIT SYSTEM REFRIGERANT AND OIL CHARGING TABLE (THROUGH GEN 4)
Evaporator
Condenser
Recommended
Recommended
Up to GEN 5
All Series
R134a Charge
Oil Charge*
EM-1, EM-2, or EM-9
CM-2
5.00 Pounds
10.0 Ounces
EM-1, EM-2, or EM-9
CM-11
5.25 Pounds
10.5 Ounces
EM-6
CM-2
4.00 Pounds
8.0 Ounces
EM-6
CM-11
4.25 Pounds
8.5 Ounces
EM-1, EM-2, or EM-9
CM-3
5.50 Pounds
11.0 Ounces
EM-1, EM-2, or EM-9
CM-7
6.50 Pounds
13.0 Ounces
EM-3
(2) CM-2
4.25 Pounds Each
8.5 Ounces Each
EM-3
(2) CM-7
6.25 Pounds Each
12.5 Ounces Each
EM-3
(2) CM-3
5.50 Pounds Each
11.0 Ounces Each
EM-3
(2) CM-7
6.25 Pounds Each
12.5 Ounces Each
EM-14
CM-2
3.50 Pounds
7.0 Ounces
EM-14
CM-11
3.75 Pounds
7.5 Ounces
EM-17
CM-5
19.0 Pounds
Consult Factory
EM-17
KR-4
13.0 Pounds
Consult Factory
EM-17 Split System
(2) CM-3
6.00 Pounds Each
12.0 Ounces Each
IW-1
4.25 Pounds Each
8.5 Ounces Each
IW-2
6.25 Pounds Each
12.5 Ounces Each
IW-7
5.50 Pounds Each
11.0 Ounces Each
8--1
T--311
CLOSE-UP VIEW
COIL FINS
Figure 1-11 Micro-Channel Style Condenser Assembly
Table 8-2 SPLIT SYSTEM REFRIGERANT AND OIL CHARGING TABLE (GEN--5)
Condenser
Recommended
Recommended
Evaporator
All Series
R134a Charge
Oil Charge*
GEN 5
GEN 5 - EM-1
CM-2 or CM-4
4.75 Pounds
9.5 Ounces
GEN 5 - EM-1
CM-11
5.00 Pounds
10.0 Ounces
GEN 5 - EM-1
CM-3
5.25 Pounds
10.5 Ounces
GEN 5 - EM-1
CM-7
6.25 Pounds
12.5 Ounces
GEN 5 - EM-7
CM-2 or CM-4
4.00 Pounds
8.0 Ounces
GEN 5 - EM-7
CM-11
4.25 Pounds
8.5 Ounces
GEN 5 - EM-2
CM-2 or CM-4
4.50 Pounds
9.0 Ounces
GEN 5 - EM-2
CM-11
4.75 Pounds
9.5 Ounces
GEN 5 - EM-2
CM-3
5.00 Pounds
10.0 Ounces
GEN 5 - EM-2
CM-7
6.00 Pounds
12.0 Ounces
Table 8-3 SPLIT--SYSTEM GEN--5 WITH MICRO--CHANNEL CONDENSER
Evaporator
EM--1, EM--9, IW--1
EM--1, EM--9, IW--1
EM--2, IW--2
EM--2, IW--2
EM--7, IW--14
EM--7, IW--14
EM--3 (dual loop)
Condenser
Micro--Channel
CM--2
CM--3
CM--2
CM--3
CM--2
CM--3
(2) CM--3
Recommended
R134a Charge
3.25 Pounds
3.75 Pounds
3.00 Pounds
3.50 Pounds
2.75 Pounds
3.00 Pounds
4.50 Pounds (each)
Recommended
Oil Charge
6.5 Ounces
7.5 Ounces
6.0 Ounces
7.0 Ounces
5.0 Ounces
6.0 Ounces
9.0 Ounces (each)
After determining the approximate charge using the above tables, refer to “System Performance Chart” (Table 8-5)
to determine if the correct charge has been obtained.
The data listed in Table 8-1 trough Table 8-3 is based on a 20 foot liquid line. Increase the charge by 0.5 pound for each
additional 10 feet of liquid line.
8.1.5 . Evaporator Tie-In
When an after market in-dash evaporator is added to a standard system the refrigerant charge will increase by
approximately 1 pound.
If attempting to use a CM-2 condenser with a tie-in call Carrier Transport Air conditioning technical support for an
application review.
T--311
8--2
Table 8-4 COMPRESSOR OIL TYPE & PART NUMBERS
Manufacturer
Seltec -- Valeo -- ICE -- Zexel -- Sanden
Alma (A--6)
05G & 05K Bus & 06D
Oil Type
PAG
PAG
POE
CTAC Part Number
46--50006--00
46--50004--00
46--50008--00
For questions regarding charging procedures, contact the Carrier Transport Air Conditioning Technical Service Hot
Line (1--800-450-2211).
CAUTION
Use only the exact oil specified by Carrier Transicold. Use of oil other than that specified will void the
compressor warranty.
8.1.6 . Adding Refrigerant to System (Full Charge)
a. Evacuate unit and leave in deep vacuum.
b. Place cylinder of R-134a on scale and connect charging line from cylinder to liquid line valve. Purge charging line at liquid line valve and then note weight of cylinder and refrigerant.
c. Calculate the approximate refrigerant charge using
either Table 8-1 or Table 8-2. Open liquid valve on refrigerant cylinder. Open suction line service port coupler and allow the liquid refrigerant to flow into the unit
until the correct weight of refrigerant has been added
as indicated by scales.
Change 06/10
NOTE
It may be necessary to finish charging unit
through suction service port in gas form, due to
pressure rise in high side of the system.
d. Close suction line service port coupler. Close liquid
valve on cylinder.
e. Start unit in cooling mode. Run approximately 10 minutes and check the refrigerant charge. (Refer to
Table 8-5).
8--3
T--311
Table 8-5 CARRIER TRANSPORT AIR CONDITIONING SYSTEM PERFORMANCE CHART
Determine the approximate refrigerant charge using Table 8-1 or Table 8-2 .
Follow the procedures listed below to determine if the correct charge has been obtained.
Procedure
Table
Pressure
Refrigerant Temp.
PSIG
R-12
R134a
(A)
(B)
(C)
95
87
85
100
90
88
105
93
90
110
96
93
115
99
96
120
102
98
125
104
100
130
107
103
135
109
105
140
112
107
145
114
109
150
117
112
155
119
114
160
121
116
165
123
118
170
126
120
175
128
122
180
130
123
185
132
125
190
134
127
195
136
129
200
138
131
205
140
132
210
142
134
215
143
136
220
145
137
225
147
139
235
150
142
245
154
145
255
157
148
265
160
151
275
163
153
1. Connect Manifold Gauge Set To
Air Conditioning System
Certified Air Conditioning Mechanic
Only
2. Measure outside (ambient) air
temperature.
Enter here ------------ -->
3. Add 40 degrees F to the outside
(ambient) air temperature --->
(See Note below)
4. Find closest refrigerant
temperature in Table
(B or C) and enter here --- -->
5. Going across the Table, find the
corresponding pressure (A) -->
Your Entry
Example
NONE
NONE
______Degrees F
100 Degrees F
40 Degrees F
______Degrees F
40 Degrees F
140 Degrees F
______Degrees F
139 Degrees F
(D)=______ PSI
225 PSI
***
***
6. If the Discharge Pressure
(High Side) on gaugers
(With compressor engaged,
engine speed 1200 RPM, and
system operating) is :
Greater than (D) - Reduce refrigerant
by 4 ounce increments.
Less than (D) - Add refrigerant
Wait 10 minutes for system to
stabilize before taking new readings
NOTE
If using the Micro-Channel type Condenser assembly, add 37 degrees in step 3 instead of 40 degrees.
This is due to the approximately 10 psi lower discharge pressure that will be experienced with this
type application.
T--311
8--4
SECTION 9
LEAK CHECKING
9.1 INTRODUCTION
9.2 REFRIGERANT LEAK CHECKING
The purpose of leak checking is to verify the integrity of
the hose/fitting connections and components. A
refrigerant leak check should always be performed after
installing a new system or the system has been opened
to replace or repair a component. It is imperative that the
inspection for refrigerant leaks be conducted in a
through and meticulous manner. Even the smallest leak
can result in poor system performance and premature
compressor failure. When a leak occurs, the refrigerant
is replaced by air and moisture from outside the system.
Without a complete charge of refrigerant in the system,
insufficient oil is returned to the compressor. The
compressor will overheat and eventually fail. Following
established leak checking procedures will result in long
term performance and assure longevity of the system
components.
9.1.1 Micron (Vacuum) Gauge
Carrier Transport Air Conditioning recommends a
Micron (Vacuum) Gauge to assure that the proper
vacuum level is attained. When isolated according to
instructions the Micron Gauge will show a loss of
evacuation vacuum, making it an excellent first leak
check.
9.1.2 Nitrogen
A common method in use for leak detection, is
pressurizing the system with dry nitrogen and checking
with a soap bubble solution at suspected leak sites.
While this method will find large leaks, it is limited in
detection of the smaller leaks found with R134a.
WARNING
Never use air for leak testing. It has been determined that pressurized, air-rich mixtures
of refrigerants and air can undergo combustion when exposed to an ignition
source.
a. Charge the system with refrigerant 134a to build up
pressure between 30 to 50 psig.
b. Add sufficient nitrogen to raise system pressure
to150/200 psig. (10.21/13.61 bar).
Note
Larger split systems may be equipped with service valves and a liquid line solenoid. Ensure
these service valves are open and power the
liquid line service valve from an external
source.
WARNING
Do not use a nitrogen cylinder without a
pressure regulator
NOTE
If the system is to be pressurized with refrigerant gas it must be emphasized that only the correct refrigerant cylinder be connected to pressurize the system. Any other gas or vapor will
contaminate the system, which will require
additional evacuations (Refer to Figure 9-1 for
service connections).
c. The recommended procedure for finding leaks in a
system is with a R-134a electronic leak detector (CTD
Part Number 07-00295-00). Testing joints with soapsuds is satisfactory only for locating large leaks.
d. Remove refrigerant using a refrigerant recovery system and repair any leaks.
e. Evacuate and dehydrate the unit (Refer to Section 7).
f. Charge the unit. (Refer to Section 8).
9--1
T--311
TXV
LPS
(New Location GEN 5)
EVAPORATOR COIL
SUCTION ACCESS
SIGHT GLASS
7
FILTER DRYER
RECEIVER DRIER
DISCHARGE
ACCESS
6
(GEN 4
Location)
HPS
LPS
CONDENSER COIL
COMPRESSOR
S
D
3
5
2
4
1.
2.
3.
4.
Vacuum Pump
Micron Gauge
Manifold Gauge Set
Refrigerant Cylinder
5.
6.
7.
1
Recovery/Recycle Machine
R134a High (Discharge) Side Coupler
R134a Low (Suction) Side Coupler
Figure 9-1 Refrigerant Service Connections (Split Systems)
T--311
9--2
SECTION 10
WARRANTY REGISTRATION
10.1 INTRODUCTION
c. Click on: Installer Information Only or Installer & Owner Information
d. Follow promps.
The warranty registration process is a very important
part of the installation of any air conditioning system. In
order to experience the full benefits of Carrier Transport
Air Conditioning’s warranty, it is imperative that your
system is registered completely and accurately. Failure
to properly register the system will adversly affect the
availability of warranty coverage. A properly registered
system will enable Carrier Transport Air Conditioning to
respond immediately in the event of a warrantable
failure.
10.2.3 Paper Registration (Obsolete)
Locate the warranty registration card that is inclosed
with the installation kit. (See Figure 10-1).
The warranty registration card consists of three (3)
copies.
1. Yellow copy: Installer copy:
a. Completely fill out all Installer and Product information. Date of Installation, Installer Name, Address,
City, State, Zip code and Phone number.
b. When Purchaser information is known, the installer
can complete this part of the form also.
c. If the Warranty Registration Card is complete, the
white (pre-addressed) copy can be mailed to Carrier
Transport Air Conditioning at this time.
d. Installer to keep yellow copy for file.
e. Installer to forward (with bus) green and white copy
to purchaser (end-used).
2. Green copy: Purchaser (End User) copy:
a. Complete Purchaser copy, sign, then mail white
(pre-addressed) copy to Carrier Transport Air Conditioning.
b. Purchaser (end user) to keep green copy for file.
NOTE
Starting in 2007 all Carrier Transport A/C systems must be registered electronically (on-line)
using the procedures detailed in Section 10.2.
Paper registrations will be accepted for a limited
time only.
NOTE
Failure to properly register the system will adversly affect the availability of warranty coverage.
10.2 PROCEDURES
10.2.1 Authorized Carrier Transport A/C Dealers
Log on to: www.transcentral.carrier.com (password required).
c. Follow promps.
3. White Copy: Carrier Transport Air Conditioning
copy:
a. Must be mailed to Carrier Transport Air Conditioning,
50 Grumbacher Road, York, PA. 17406, in order to
validate the system warranty.
10.2.2 Consumers
10.3 WARRANTY POLICY
Log on to: www.transportaircon.carrier.com
10.3.1 In-Line Failures - OEM/Installer Repair
Please contact the Carrier Transport Air Conditioning
Technical Service Hot Line (1--800-450-2211). for
assistance.
a. Click on: Warranty
b. Click on: Register your unit
a. Click on: Warranty Information
b. Click on: Register Your Unit
Figure 10-1 Warranty Registration Card (Obsolete)
Change 07/09
10--1
T--311
SECTION 11
FINAL (CHECK-OUT SHEET)
INSTALLATION CHECK-OUT
The installation checkout procedure is an important step in the installation of any air conditioning system. The reason
for the installation checkout procedure is to insure that all Carrier Transport Air Conditioning standards of installation
quality have been met. An itemized checkout form will help you in the checkout process and will provide a device for
permanently recording your findings. The form that follows this introduction represents a guideline, that can be used as
is, or as a starting point for the development of your own custom installation checkout sheet. A correctly completed
final checkout will guarantee a quality installation that will last the life of the bus.
GENERAL INFORMATION
BUS MODEL/BODY_______________________ BUS VIN#__________________________________
CARRIER TAC SYSTEM___________________EVAP’S_______COND’S_______COMP’S_______
1. ENGINE AREA:
YES
NO
____
____
Is care taken during the un-packing and installation of the comptressor assembly,
thus ensuring the compressor clutch factory-set air gap was not compromised?
Never place the compressor on the clutch assembly.
____
____
Is compressor and compressor mount secure?
____
____
Are bolts torqued to proper specifications when noted on mount kit drawing?
____
____
Is there good alignment between the compressor, idler and crank pulley? Always use a
straight edge to determine alignment. Eye sighting is not good enough!
____
____
Are belts tightened per manufacturers recommendations?
____
____
Are refrigerant hoses routed through the engine compartment to the compressor
correctly? Refrigerant hose must be protected from heat sources and sharp objects!
Refrigerant hose should be supported with insulated clamps wherever possible.
CONDENSER AREA:
YES
NO
____
____
Is the condenser(s) mounted securely to the bus floor?
____
____
Is condenser(s) mounted as close as possible to bus skirt? If condenser cannot be
mounted close to the skirt, a shroud must be installed to prevent re-circulation of heat.
____
____
Is bus skirt cut out to allow maximum airflow across the coil? Cut out must be at
least as large as the condenser coil to allow for maximum heat rejection.
____
____
Are all the condenser fans blowing air in the proper direction? Through the Bus
skirt cut-out and across the condenser coil.
11--1
T--311
INSTALLATION CHECK-OUT, CONDENSER - Continued:
____
____
Are exposed terminals/connections protected with an anti-corrosive coating?
____
____
If and when needed, is condenser(s) protected from road-sling?
____
____
Is condenser properly grounded to the chassis?
EVAPORATOR AREA:
YES
NO
____
____
Is evaporator(s) mounted securely to the bus roof? Either through the roof using
hardware supplied by Carrier Transport Air Conditioning or by Carrier Transport Air
Conditioning approved OEM supplied mounting brackets?
____
____
If evaporator is mounted with carriage bolts through the roof, are the roof rails
and bolts tight and sealed with caulking?
____
____
Are refrigeration hoses routed properly? In hose covers or in the skin of the bus.
Hose Covers must never cover Bus windows.
____
____
Are two drain lines installed and running to opposite sides of the bus?
____
____
Are drain lines running downhill?
____
____
Are condensate valves (Kazoos) installed on drain line outlets?
____
____
Is suction fitting and block valve (TXV) wrapped with “no-drip” tape to prevent
condensate drip?
____
____
Is suction hose covered with insulation to prevent condensate drip?
____
____
Are blowers/fans running in the proper direction? Through evaporator filter and pushing air
into the passenger compartment.
____
____
Are evaporators properly grounded? Evaporator must be grounded on the nearest vehicle
chassis rail using the ground wire (8 Gauge) supplied with installation kit.
____
____
If ducted system, is ductwork properly mounted and trimmed?
____
____
Are all required grills/louvers installed in the ductwork?
REFRIGERATION HOSE AND ELECTRICAL HARNESS ROUTING:
YES
NO
____
____
Is system wiring harnesses and refrigerant hoses protected from sharp edges, heat sources
and moving parts? Refrigerant hoses and harnesses must be protected from heat sources,
sharp edges and moving parts.
____
____
Are insulated clamps used to support the hose and harness? Refrigerant hose should be
supported with insulated clamps wherever possible. Tie-wraps should only be used to bundle
together wiring and hose assemblies.
________
T--311
Are the “Quick-Click” fittings properly clamped to the “Quick-Click” hose?
11--2
REFRIGERATION HOSE AND ELECTRICAL HARNESS ROUTING - Continued:
YES
NO
____
____
Is “Mineral Oil” used to lubricate the fittings, hose and “O” Rings?
____
____
Is there a workable “service loop” at all refrigerant hose connections?
____
____
Are refrigerant hoses routed to the condenser, evaporator and compressor
properly?
____
____
Is system free of refrigerant hose kinks and twists?
____
____
Is excess oil wiped from fittings and hose? Dust will collect on the oil giving the false
indication that there is a refrigerant leak.
____
____
Is 12.5 Volts available at the Compressor Clutch, Evaporator and Condenser?
____
____
Are electrical connections secure and protected from the environment?
____
____
Are electrical connections properly crimped and fastened?
____
____
Are circuit breakers located within 24 inches of the power source?
____
____
Are relays, circuit breakers and controls located in an area with adequate
ventilation?
____
____
Is the electrical panel properly grounded?
____
____
Are controls located within easy reach of the driver?
____
____
Are current (latest revision) wiring diagrams available to the installer?
SYSTEM OPERATION:
YES
NO
____
____
Does the installer clearly understand and consistently apply a method for calculating
the correct refrigerant and oil charge?
____
____
Is a Micron Gauge used during evacuation?
____
____
Was 1000 microns or less reached during evacuation?
____
____
Do evaporator blower speeds react to low, medium and high-speed settings?
____
____
Turning thermostat counterclockwise and then clockwise, does compressor turn
off and then on? If a dual system, verify thermostat and pressure switch wiring is connected
to the proper system.
____
____
If dual system, is each system checked separately (independently of each other)?
____
____
Is freeze-up thermostat (located in evaporator) properly adjusted? Turn
counterclockwise to end, then clockwise 1/4 turn.
11--3
T--311
SYSTEM OPERATION - Continued:
____
____
Has refrigerant and oil charge been noted on the charging label? Correct type oil?
____
____
Is charging label attached as closely as possible to the compressor?
____
____
Is there an installation check-out sheet in use?
FINAL:
Record readings after system has been running for at least 10 minutes at high idle.
System Pressure(s): Rear or Passenger Side
Suction Pressure
Front or Drivers Side
_____ psig
Suction Pressure
Discharge Pressure _____ psig
____ psig
Discharge Pressure ____ psig
Temperatures:
Ambient Temperature _____F
Evaporator Air Temperature In _____ F _____ F _____ F
Evaporator Air Temperature Out _____ F _____ F _____ F
Charges:
Actual values as recorded on charging sticker in engine compartment.
Rear or Passenger Side: --- Refrigerant ______Lb ______ Oz
Oil ______Oz
Front or Drivers Side: ---- Refrigerant ______Lb ______ Oz
Oil ______Oz
Electrical Data:
Alternator Size _____Amps
Alternator current with all accessories and A/C on ____Amps
Voltage at: Compressor Clutch ______ V
Compressor Clutch ______ V
Evaporator ______ V
Condenser ______V
Evaporator ______ V
Condenser ______V
Voltage at battery with all accessories and air conditioning on _________V
Installer/Technician_______________________________________Date__________________________
OEM OR INSTALLATION CENTER ---------------------------------------------------------------------------------------------
T--311
11--4
11.1 SYSTEM REQUIREMENTS LABEL
The system requirements label must be conveniently
located within the vehicle’s engine compartment. This
label, when properly completed by the installer, will give
the servicing technician the refrigerant and oil
charge(s),
evaporator(s),
condenser(s),
and
compressor(s) serial numbers, the drive belt(s) number,
mount kit number, the date of installation and the
installer (See Figure 11-1).
11.1.1 System Requirement Label Completion
To complete the system requirement label do the
following:
1. Lift the protective acetate cover to expose the blue
and white data tag.
2. Enter the serial numbers of the (system
components) compressor(s), evaporator(s), and
condenser(s) where designated on the tag.
3. Enter the type of refrigerant used and the amount
that was placed into each system, in pounds and
ounces. If this is a dual system, designate on tag which
system (#1 or #2) is front (F) or rear (R), drivers (D) or
passenger (P) side.
4. Enter (print) the type oil used and the amount, in
ounces.
5. Enter the compressor(s) drive belt(s) part number
or length.
6. Enter the mount kit (if used) part number.
7. Enter (print) your company’s name (Installer).
8. Enter the date the installation was completed.
9. Determine where the label will be placed within the
engine compartment. Wipe that area clean.
10. Remove the covering from the back of the label,
exposing the adhesive surface. Place the label in the
pre-determined location.
11. Carefully remove the protective covering from the
clear acetate. Carefully smooth the protective acetate
over the data tag label.
01- 22- 07
Figure 11-1 System Requirements Label
11--5
T--311
INDEX
A
Adding Refrigerant to System (Full Charge), 8-2
Aesthetics, 2-1
AUXILIARY HEATER HOSE ROUTING, 4-10
B
Barrier Type Hose & Fittings, 4-1
Belt Clearance, 6-2
Blower Wheels, 2-1
EM-23 COOL/HEAT EVAPORATOR, 2-24
EM-3 EVAPORATOR, 2-8
EM-9 DUCTED EVAPORATOR , 2-12
Evaporator Chassis Ground, 5-2
Evaporator Chassis Ground, Gen 4 , 5-1
EVAPORATOR HOSE ROUTING, 4-1, 4-5
EVAPORATOR HOSE ROUTING, SIDE-MOUNTED,
4-6
Evaporator Tie-In, 8-2
EVAPORATORS, 1-7
Bus Headliners, 2-1
C
F
Front Mounted In-Wall Evaporator, 2-21
Cap Plugs, 2-1
I
CHASSIS HOSE ROUTING, 4-7
CM-2 AND CM-3 STACKED CONDENSER , 3-10
In-Wall Evaporator - TBB, 2-24
Cm-5 CONDENSER, 3-5
INSTALLATION CHECK-OUT, 11-1
Component Connections, 5-1
Installation Position, 6-4
COMPRESSOR HOSE ROUTING, 4-9
INSTALLING MANIFOLD GAUGES, 7-2
COMPRESSOR INSTALLATION, 6-4
Installing Manifold Guages, 7-2
CONDENSER HOSE ROUTING, 4-8
INTRODUCTION, 1-1, 2-1
CONDENSERS, 1-8, 3-2
IW-1, IW-2, IW-7 & IW-14 EVAPORATORS, 2-16
Connection Lubrication (Mineral Oil), 4-1
CONTROLS, 5-2
K
COOLING CYCLE, 1-5
KR-4 ROOFTOP CONDENSER , 3-6
D
L
Drain Lines, 2-1
DRIVE BELT INSTALLATION, 6-2
Leak Checking, 9-1
Drive Belt Tension-Guidelines, 6-4
Liquid Charging , 8-1
Dual Systems, 4-1, 5-1
M
Ducted Systems, 2-1
E
Manual controls, 5-2
Measuring Methods for Belt Tension, 6-4
Electrical Control Panel, 5-3, 5-4
Micro-Channel Condenser, 8-1
Electrical Kits, 5-1
Micron (Vacuum) Gauge, 9-1
EM-17 EVAPORATOR, 2-15
Mounting (Rooftop), 3-1
EM-20, EM-21 & EM-22 EVAPORATORS, 2-24
Mounting Compressors, 6-4
Index--1
T--311
INDEX
N
Nitrogen, 9-1
O
Obstructions, 3-1
Oil Charge, 6-5
Oil Charge , 8-1
Requirements Label, 1-1
ROOFTOP CONDENSER HOSE ROUTING, 4-10
S
Serial Number Tags , 1-1
Service Loop, 4-1
SERVICE TOOLS, 7-1
SIDE MOUNTED EVAPORATOR, 2-9
OPERATING INSTRUCTIONS , 5-6
Skirt Supports, 3-1
ORQUE SPECIFICATIONS, 4-10
SKIRTMOUNTED CONDENSER ASSEMBLIES, 3-2
P
PAG And POE Oils , 8-1
PIPING DIAGRAMS, 4-10
SYSTEM COMPONENTS, 1-4
SYSTEM NOMENCLATURE, 1-1
SYSTEM REQUIREMENTS LABEL, 11-5
SYSTEM WIRING , 5-1
PRE-INSTALLATION, 1-8
T
PREVENTATIVE MAINTENANCE, 3-1
PROCEDURES, 10-1
TORQUE SPECIFICATIONS, 6-2
Pulley Alignment, 6-3
TOTAL CONTROL, 5-5
Total Control Electrical Control Panel, 5-5
Q
Quick-Click Hose & Clamps, 4-1
R
R134a Charge, 8-1
Total Control Key Pad/Display, 5-5
TROUBLESHOOTING, 2-1
V
VOLTAGES, 5-1
REAR MOUNTED EVAPORATORS, 2-2
W
Rear Mounted In-Wall Evaporator, 2-16
REFRIGERANT SERVICE TOOLS, 7-1
T--311
WIRING SCHEMATICS, 4-1
Index--2
Carrier Transport Air Conditioning
50 Grumbacher Road
York PA 17406 USA
Tel: 1--800--673--2431
Fax: 1--717--764--0401
Carrier Transicold Division,
Carrier Corporation
Transport Air Conditioning Group
P.O. Box 4805
Syracuse, N.Y. 13221 U.S A
www.carrier.transicold.com
A member of the United Technologies Corporation family. Stock symbol UTX
©2008 Carrier Corporation D Printed in U. S. A. 0208