Air-Cooled Screw Compressor Chiller Installation and Maintenance Manual

Air-Cooled Screw Compressor Chiller Installation and Maintenance Manual
Installation and Maintenance Manual
IMM AGSD3-1
Group: Chiller
Part Number:: 331376001
Date: April 2010
Supersedes: March 2009
Air-Cooled Screw Compressor Chiller
AGS 140DS - AGS 210DS, Standard Efficiency, Packaged
AGS 140DE - AGS 190DE, High Efficiency, Packaged
AGS 140DM – AGS 210DM, Standard Efficiency, Remote Evaporator
AGS 140DF – AGS 190DF, High Efficiency, Remote Evaporator
60 Hertz, R-134a
Table of Contents
INTRODUCTION..................................................... 3
REMOTE EVAPORATOR .................................... 41
GENERAL DESCRIPTION ........................................... 3
NOMENCLATURE ...................................................... 3
INSPECTION.............................................................. 3
PIPING LAYOUT ...................................................... 41
FIELD WIRING (REMOTE EVAPORATOR) ................. 42
KIT COMPONENTS .................................................. 43
REFRIGERANT LINE SIZING..................................... 43
DIMENSIONS & WEIGHTS, REMOTE EVAPORATOR .. 45
PHYSICAL DATA ..................................................... 50
VIBRATION ISOLATORS, REMOTE EVAPORATOR ...... 52
INSTALLATION AND START-UP ......................... 4
HANDLING ............................................................... 4
LOCATION ................................................................ 5
SERVICE ACCESS ...................................................... 5
CLEARANCE REQUIREMENTS ................................... 6
RESTRICTED AIRFLOW ............................................. 7
VIBRATION ISOLATORS ........................................... 13
CHILLED WATER PUMP........................................... 15
WATER PIPING ........................................................ 15
SYSTEM WATER VOLUME ...................................... 16
VARIABLE SPEED PUMPING .................................... 16
EVAPORATOR FREEZE PROTECTION........................ 16
OPERATING LIMITS:................................................ 17
FLOW SWITCH ........................................................ 18
REFRIGERANT CHARGE .......................................... 19
GLYCOL SOLUTIONS ............................................... 19
SOLID STATE STARTERS ................................... 54
COMPONENT LOCATION .................................. 61
MAJOR COMPONENT LOCATION ............................. 61
POWER PANEL ........................................................ 63
CONTROL PANEL .................................................... 64
SYSTEM MAINTENANCE................................... 65
PREVENTATIVE MAINTENANCE SCHEDULE............. 67
WARRANTY STATEMENT .................................. 68
SERVICE ................................................................. 68
WATER FLOW AND PRESSURE DROP............ 20
PHYSICAL DATA .................................................. 22
DIMENSIONS & WEIGHTS ................................ 24
ELECTRICAL DATA............................................. 27
FIELD WIRING ........................................................ 27
STANDARD EFFICIENCY.......................................... 28
HIGH EFFICIENCY................................................... 32
LIQUID LINE FILTER-DRIERS .................................. 68
COMPRESSOR SLIDE VALVES .................................. 69
ELECTRONIC EXPANSION VALVE (EXV)................. 71
EVAPORATOR.......................................................... 71
CHARGING REFRIGERANT ...................................... 71
STANDARD CONTROLS ........................................... 72
CONTROLS, SETTINGS AND FUNCTIONS .................. 75
TROUBLESHOOTING CHART ................................... 76
PERIODIC MAINTENANCE LOG ............................... 77
FIELD WIRING DIAGRAM................................. 35
Unit controllers are LONMARK certified
with an optional LONWORKS
communications module
Manufactured in an ISO Certified Facility
©2007 McQuay International. Illustrations and data cover the McQuay International product at the time of publication and we reserve the
right to make changes in design and construction at anytime without notice. ™® The following are trademarks or registered trademarks of
their respective companies: BACnet from ASHRAE; LONMARK, LonTalk, LONW ORKS, and the LONMARK logo are managed, granted and used
by LONMARK International under a license granted by Echelon Corporation; Compliant Scroll from Copeland Corporation; ElectroFin from AST
ElectroFin Inc.; Modbus from Schneider Electric; FanTrol, MicroTech II, Open Choices, and SpeedTrol from McQuay International.
2
IMM AGSD-1
Introduction
General Description
McQuay AGS air-cooled water chillers are complete, self-contained automatic refrigerating units
that include the latest in engineered components arranged to provide a compact and efficient unit.
Each unit is completely assembled, (except remote evaporator applications) factory wired,
evacuated, charged, tested and comes complete and ready for installation. Each unit consists of two
air-cooled condenser sections with integral subcooler sections, two semi-hermetic, single-screw
compressors with solid-state starters, a two-circuit shell-and-tube direct expansion evaporator, and
complete refrigerant piping. Each compressor has an independent refrigeration circuit. Liquid line
components included are manual liquid line shutoff valves, charging ports, filter-driers, sightglass/moisture indicators, solenoid valves and electronic expansion valves. A discharge shutoff valve
is included and a compressor suction shutoff valve is optional. Other features include compressor
heaters, evaporator heaters for freeze protection, automatic one-time pumpdown of each refrigerant
circuit upon circuit shutdown, and an advanced fully integrated microprocessor control system.
AGS units are available as standard efficiency (model DS) and high efficiency units (DE). The high
efficiency units have certain larger components to improve efficiency.
The units are optionally available with the evaporator shipped separately for remote mounting
indoors.
Information on the operation of the unit MicroTech II controller is in the OM AGSD3 manual.
Nomenclature
A G S - XXX D S
Air-Cooled
Global
Rotary Screw Compressor
Nominal Tons
S=Standard Efficiency, Packaged Unit
M=Standard Efficiency, Remote Evaporator
E= High Efficiency, Packaged Unit
F= High Efficiency, Remote Evaporator.
Design Vintage
Inspection
When the equipment is received, carefully check all items against the bill of lading to check for a
complete shipment. Check all units for damage upon arrival. All shipping damage must be reported to
the carrier and a claim must be filed with the carrier. Check the unit’s serial plate before unloading the
unit to be sure that it agrees with the power supply available. Physical damage to unit after acceptance
is not the responsibility of McQuay International.
Note: Unit shipping and operating weights are shown on page 22.
IMM AGSD3-1
3
Installation and Start-up
WARNING
!
Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.
Note: Installation and maintenance are to be performed only by qualified personnel who are
familiar with local codes and regulations, and experienced with this type of equipment.
Start-up by McQuay Factory Service is included on all units sold for installation within the USA
and Canada and must be performed by them to initiate the standard limited product warranty.
Two-week prior notification of start-up is required. The contractor should obtain a copy of the
Start-up Scheduled Request Form from the sales representative or from the nearest office of
McQuay Factory Service.
WARNING
!
Escaping refrigerant can displace air and cause suffocation. Immediately evacuate and
ventilate the equipment area. If the unit is damaged, follow Environmental Protection
Agency (EPA) requirements. Do not expose sparks, arcing equipment, open flame or other
ignition source to the refrigerant.
Handling
Avoid rough handling shock due to impact or dropping the unit. Do not push or pull the unit.
Never allow any part of the unit to fall during unloading or moving, as this can result in serious
damage.
To lift the unit, lifting tabs with 2½" (64 mm) diameter holes are provided on the base of the unit.
All lifting holes must be used when lifting the unit. Spreader bars and cables should be arranged
to prevent damage to the condenser coils or unit cabinet (see Figure 1).
!
DANGER
Improper lifting or moving unit can result in property damage, severe personal injury or
death. Follow rigging and moving instructions carefully
Figure 1, Required Lifting Method
NOTES:
1. All rigging points on a unit must be used. See
location and weights at lifting points
beginning on page 22 for a specific size unit.
2. Crosswise and lengthwise spreader bars
must be used to avoid damage to unit. Lifting
cables from the unit mounting holes up must
be vertical.
3. The number of condenser sections, and fans
can vary from this diagram.
4
IMM AGSD3-1
Location
Locate the unit carefully to provide proper airflow to the condenser. (See Figure 2on page 6 for
required clearances).
Due to the shape of the condenser coils on the AGS chillers, it is recommended that the unit be
oriented so that prevailing winds blow parallel to the unit length, thus minimizing the wind
effect on condensing pressure and performance. If low ambient temperature operation is
expected, optional louvers should be installed if the unit has no protection against prevailing
winds.
Using less clearance than shown in Figure 2 can cause discharge air recirculation to the
condenser and could have a significant detrimental effect on unit performance.
See Restricted Airflow beginning on page 7 for further information.
For pad-mounted units, it is recommended that the unit be raised a few inches with suitable
supports, located at least under the mounting locations, to allow water to drain from under the
unit and to facilitate cleaning under it
Service Access
Compressors, filter-driers, and manual liquid line shutoff valves are accessible on each side or end of
the unit. The evaporator heater is located on the barrel.
The control panels are located on the end of the chiller. The left-hand control box contains the unit and
circuit microprocessors as well as transformers, fuses and terminal. The right-hand panel contains a
circuit breaker and solid state starter for each compressor plus fuses, fan VFD (optional) and fan
contactors. A minimum of four feet of clearance is required in front of the panels.
The side clearance required for airflow provides sufficient service clearance.
On all AGS units, the condenser fans and motors can be removed from the top of the unit. The
complete fan/motor assembly can be removed for service. The fan blade must be removed for access to
wiring terminals at the top of the motor.
!
WARNING
Disconnect, lockout and tag all power to the unit before servicing condenser fan motors or
compressors. Failure to do so can cause bodily injury or death.
Do not block access to the sides or ends of the unit with piping or conduit. These areas must be open
for service access. Do not block any access to the control panels with a field-mounted disconnect
switches.
IMM AGSD3-1
5
Clearance Requirements
Figure 2, Clearance Requirements
No obstructions.
Recommended area
required for unit
operation, air flow
and maintenance
access.
5ft (1.5m) if open fence or 50% open wall
6ft (1.8m) if solid wall (see note 3 for pit)
4ft (1.2m)
For electric
panel access
5ft (1.5m) if open fence or 50% open wall
6ft (1.8m) if solid wall (see note 3 for pit)
See notes 2 & 4
concerning wall
height at unit sides.
3ft (1m) for service
Air Flow
No obstructions allowed
above unit at any height
See Note 5
Wall or
Fence
Notes:
1. Minimum side clearance between two units is 12 feet (3.7 meters).
2. Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit unless extra
clearance is provided per note 4.
3. Minimum clearance on each side is 8 feet (2.4 meters) when installed in a pit no deeper than the unit height.
4. Minimum side clearance to a side wall or building taller than the unit height is 6 feet (1.8 meters), provided
no solid wall above 6 feet (1.8 meters) is closer than 12 feet (3.7 meters) to the opposite side of the unit.
5. Do not mount electrical conduits where they can block service access to compressor controls, refrigerant
driers or valves.
6. There must be no obstruction of the fan discharge.
7. Field installed switches must not interfere with service access or airflow.
8. The evaporator can be removed from the side of the unit and may require the temporary removal of a coil
section support post. See dimension drawings beginning on page 24 for details.
9. If the airflow clearances cannot be met, see the following pages on Restricted Airflow.
6
IMM AGSD3-1
Restricted Airflow
General
The clearances required for design operation of AGS air-cooled condensers are described in the
previous section. Occasionally, these clearances cannot be maintained due to site restrictions such as
units being too close together or a fence or wall restricting airflow, or both.
The McQuay AGS chillers have several features that can mitigate the problems attributable to
restricted airflow.
•
The shape of the condenser section allows inlet air for these coils to come in from both sides and
the bottom. All the coils on one side serve one compressor. Every compressor always has its own
independent refrigerant circuit.
•
The MicroTech II control is proactive in response to off-design conditions. In the case of single
or compounded influences restricting airflow to the unit, the microprocessor will act to keep the
compressor(s) running (at reduced capacity) as long as possible, rather than allowing a shut-off on
high discharge pressure.
Figure 3, Coil and Fan Arrangement
The following sections discuss the most common situations of condenser air restriction and give
capacity and power adjustment factors for each. Note that in unusually severe conditions, the
MicroTech II controller will adjust the unit operation to remain online until a less severe condition is
reached.
IMM AGSD3-1
7
Case 1, Building or Wall on One Side of One Unit
The existence of a screening wall, or the wall of a building, in close proximity to an air-cooled chiller
is common in both rooftop and ground level applications. Hot air recirculation on the coils adjoining
the wall will increase compressor discharge pressure, decreasing capacity and increasing power
consumption.
When close to a wall, it is desirable to place chillers on the north or east side of them. It is also
desirable to have prevailing winds blowing parallel to the unit’s long axis. The worst case is to have
wind blowing hot discharge air into the wall.
Figure 4, Unit Adjacent to Wall
D
H
Figure 5, Adjustment Factors
8
5 ft.
(1.5m)
5 ft.
(1.5m)
6 ft.
(1.8m)
6 ft.
(1.8m)
IMM AGSD3-1
Case 2, Two Units Side By Side
Two or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters), or 8 feet (2.5
meters), depending on size, it is necessary to adjust the performance of each unit. Circuits adjoining each
other are affected. NOTE: This case applies only to two units side by side. See Case 3 for three or more
parallel units. If one of the two units also has a wall adjoining it, see Case 1. Add the two adjustment factors
together and apply to the unit located between the wall and the other unit.
Mounting units end to end will not necessitate adjusting performance. Depending on the actual arrangement,
sufficient space must be left between the units for access to the control panel door opening and/or evaporator
tube removal. See “Clearance” section of this guide for requirements for specific units.
Figure 6, Two Units Side by Side
Figure 7, Adjustment Factor
IMM AGSD3-1
9
Case 3, Three or More Units Side By Side
When three or more units are side by side, the outside units (chillers 1 and 3 in this case) are influenced by the
middle unit only on their inside circuits. Their adjustment factors will be the same as Case 2. All inside units
(only chiller 2 in this case) are influenced on both sides and must be adjusted by the factors shown below.
Figure 8, Three or More Units
Chiller 1
Chiller 2
Chiller 3
Figure 9, Adjustment Factor
10
IMM AGSD3-1
Case 4, Open Screening Walls
Decorative screening walls are often used to help conceal a unit either on grade or on a rooftop. These walls
should be designed such that the combination of their open area and distance from the unit do not require
performance adjustment. It is assumed that the wall height is equal to or less than the unit height when
mounted on its base support. This is usually satisfactory for concealment. If the wall height is greater than the
unit height, see Case 5, Pit Installation.
The distance from the ends of the unit to the end walls must be sufficient for service, opening control panel
doors, and pulling evaporator tubes, as applicable.
If each side wall is a different distance from the unit, the distances can be averaged, providing either wall is
not less than 8 feet (2.4 meters) from the unit. For example, do not average 4 feet and 20 feet to equal 12 feet.
Figure 10, Open Screening Walls
Figure 11, Wall Free Area vs. Distance
IMM AGSD3-1
11
Case 5, Pit/Solid Wall Installation
Pit installations can cause operating problems and great care must be exercised if they are to be used
on an installation. Recirculation and restriction can both occur. A solid wall surrounding a unit is
substantially the same as a pit and the data presented in this case should be used.
Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit. The
grating material and installation design must be strong enough to prevent such accidents, yet provide
abundant open area or serious recirculation problems will occur. Have any pit installation reviewed by
the McQuay sales office prior to installation to discuss whether it has sufficient airflow characteristics.
The installation design engineer must approve the work and is responsible for design criteria.
Figure 12, Pit Installation
Figure 13, Adjustment Factor
12
IMM AGSD3-1
Vibration Isolators
Vibration isolators are recommended for all roof-mounted installations or wherever vibration
transmission is a consideration. Initially install the unit on shims or blocks at the illustrated "free
height" of the isolator. When all piping, wiring, flushing, charging, etc. is complete, adjust the springs
upward to load them and to provide clearance to free the blocks, which are then removed.
Installation of spring isolators requires flexible pipe connections and at least three feet of conduit flex
tie-ins. Support piping and conduit independently from the unit to not stress connections.
oil types, such as ElectroFin and Blackfin, use the aluminum fin data.
Isolator Installation
The unit should be initially installed on shims or blocks at the listed free height When all piping,
wiring, flushing, charging, etc. is completed, adjust the springs upward to load them and to provide
clearance to remove the shims or blocks.
Spring-Flex Locations and Kit Numbers, Packaged
NOTE: See dimension drawings for mounting point location.
Table 1, Standard Efficiency with Aluminum Fin Condensers
UNIT
SIZE
140DS to
170DS
190DS to
210DS
M1
M2
C2PE-1D2720
C2PE-1D2720
MOUNTING LOCATION
M3
M4
C2PE-1D2400
C2PE-1D2400
M5
M6
SPRING KIT
NUMBER
C2PE-1D1800
C2PE-1D1800
332320401
White
White
Gray
Gray
Dark
Dark Green
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2400
C2PE-1D2400
White
White
White
White
Gray
Gray
332320402
Table 2, High Efficiency with Aluminum Fin Condensers
MOUNTING LOCATION
UNIT
SIZE
M1
M2
M3
M4
M5
M6
SPRING KIT
NUMBER
140DE to
190DE
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2400
C2PE-1D2400
332320402
White
White
White
White
Gray
Gray
Table 3, Standard Efficiency with Copper Fin Condensers
MOUNTING LOCATIONS
UNIT
SIZE
M1
M2
M3
M4
M5
M6
SPRING KIT
NUMBER
140DS to
170DS
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2400
C2PE-1D2400
332320402
White
White
White
White
Gray
Gray
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
White
White
White
White
White
White
190DS to
210DS
332320403
Table 4, High Efficiency with Copper Fin Condensers
MOUNTING LOCATIONS
UNIT
SIZE
M1
M2
M3
M4
M5
M6
SPRING KIT
NUMBER
140DE to
210DE
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
C2PE-1D2720
332320403
White
White
White
White
White
White
IMM AGSD3-1
13
R-I-S Locations and Kit Numbers, Packaged
NOTE: See dimension drawings for mounting point location.
Table 5, Standard Efficiency with Aluminum Fin Condensers
UNIT
SIZE
140DS to
170DS
190DS to
210DS
1
RP-4
Lime
RP-4
Lime
2
RP-4
Lime
RP-4
Lime
R-I-S MOUNTINGS
3
4
RP-4
RP-4
Lime
Lime
RP-4
RP-4
Lime
Lime
5
RP-4
Brick Red
RP-4
Lime
R-I-S KIT
NUMBER
6
RP-4
Brick Red
RP-4
Lime
332325401
332325402
Table 6, High Efficiency with Aluminum Fin Condensers
UNIT
SIZE
1
2
140DE to
190DE
RP-4
Lime
RP-4
Lime
R-I-S MOUNTINGS
3
4
RP-4
Lime
RP-4
Lime
R-I-S KIT
NUMBER
5
6
RP-4
Lime
RP-4
Lime
332325402
Table 7, Standard Efficiency with Copper Fin Condensers
UNIT
SIZE
140DS to
210DS
1
RP-4
Lime
2
RP-4
Lime
R-I-S MOUNTINGS
3
4
RP-4
RP-4
Lime
Lime
5
RP-4
Lime
R-I-S KIT
NUMBER
6
RP-4
Lime
332325402
Table 8, High Efficiency with Copper Fin Condensers
UNIT
SIZE
140DE to
190DE
1
RP-4
Lime
2
RP-4
Lime
R-I-S MOUNTINGS
3
4
RP-4
RP-4
Lime
Lime
Figure 14,CP-4, Spring Flex Mounting
5
RP-4
Lime
R-I-S KIT
NUMBER
6
RP-4
Lime
332325402
Figure 15, RP-4, R-I-S,
Mounting
6.25
5.00
3.75
3.00
ø .500-13NC-2B
R4
VM&C
.56 TYP.
VM&C
4.63
3.87
R.28
TYP.
R4
R.250 TYP.
RECESSED
GRIP RIBS
DURULENE
MATERIAL
R.750 TYP.
1.13 ± .25
APPROX.
1.63
.38
NOTES:
1.
MOUNT MATERIAL TO BE DURULENE RUBBER.
2.
MOLDED STEEL AND ELASTOMER MOUNT FOR
OUTDOOR SERVICE CONDITIONS.
3.
14
RAISED GRIP RIBS
DRAWING NUMBER 3314814
ALL DIMENSIONS ARE IN DECIMAL INCHES
RP-4 MOUNT VERSION WITH STUD IN PLACE.
IMM AGSD3-1
Chilled Water Pump
It is recommended that the chilled water pumps' starters be wired to, and controlled by, the chiller's
microprocessor. The controller will energize the pump whenever at least one circuit on the chiller is
enabled to run, whether there is a call for cooling or not. Wiring connection points are shown in Figure
22 on page 35.
Water Piping
Due to the variety of piping practices, follow the recommendations of local authorities. They can
supply the installer with the proper building and safety codes required for a proper installation.
Design the piping with a minimum number of bends and changes in elevation to keep system cost
down and performance up. It should contain:
1. Vibration eliminators to reduce vibration and noise transmission to the building.
2. Shutoff valves to isolate the unit from the piping system during unit servicing.
3. Manual or automatic air vent valves at the high points of the system and drains at the low parts in
the system. The evaporator should not be the highest point in the piping system.
4. Some means of maintaining adequate system water pressure (i.e., expansion tank or regulating
valve).
5. Water temperature and pressure indicators located at the evaporator inlet and outlet to aid in unit
servicing. Any connections should be made prior to filling the system with water.
6. A strainer to remove foreign matter from the water before it enters the pump. Place the strainer far
enough upstream to prevent cavitation at the pump inlet (consult pump manufacturer for
recommendations). The use of a strainer will prolong pump life and help maintain high system
performance levels.
NOTE: A 20 mesh strainer must also be placed in the supply water line just prior to the inlet of
the evaporator. This will aid in preventing foreign material from entering the evaporator and
causing damage or decreasing its performance. Care must also be exercised if welding pipe or
flanges to the evaporator connections to prevent any weld slag from entering the vessel.
7. Any water piping to the unit must be protected to prevent freeze-up if below freezing temperatures
are expected.
!
CAUTION
If a separate disconnect is used for the 115V supply to the unit, it should power the entire
control circuit, not just the evaporator heaters. It should be clearly marked so that it is not
accidentally shut off during cold seasons. Freeze damage to the evaporator could result. If
the evaporator is drained for winter freeze protection, the heaters must be de-energized to
prevent burnout.
8. If the unit is used as a replacement chiller on a previously existing piping system, flush the system
thoroughly prior to unit installation. Perform regular chilled water analysis and chemical water
treatment immediately at equipment start-up.
IMM AGSD3-1
15
9. In the event glycol is added to the water system as a late addition for freeze protection, recognize
that the refrigerant suction pressure will be lower, cooling performance less, and water side
pressure drop greater. If the percentage of glycol is large, or if propylene is employed in lieu of
ethylene glycol, the added pressure drop and loss of performance could be substantial.
10. For ice making or low temperature glycol operation, a different freezestat pressure value is usually
required. The freezestat setting can be manually changed through the MicroTech II controller.
Make a preliminary leak check prior to insulating the water piping and filling the system.
Include a vapor barrier with the piping insulation to prevent moisture condensation and possible
damage to the building structure. It is important to have the vapor barrier on the outside of the
insulation to prevent condensation within the insulation on the cold surface of the pipe.
System Water Volume
All chilled water systems need adequate time to recognize a load change, respond to that load change
and stabilize, without undesirable short cycling of the compressors or loss of control. In air
conditioning systems, the potential for short cycling usually exists when the building load falls below
the minimum chiller plant capacity or on close-coupled systems with very small water volumes.
Some of the things the designer should consider when looking at water volume are the minimum
cooling load, the minimum chiller plant capacity during the low load period and the desired cycle time
for the compressors.
Assuming that there are no sudden load changes and that the chiller plant has reasonable turndown, a
rule of thumb of “gallons of water volume equal to two to three times the chilled water gpm flow rate”
is often used.
A properly designed storage tank should be added if the system components do not provide sufficient
water volume.
Variable Speed Pumping
Variable water flow involves reducing the water flow through the evaporator as the load decreases.
McQuay chillers are designed for this duty, provided that the rate of change in water flow is slow, and
the minimum and maximum flow rates for the vessel are not exceeded.
The recommended maximum change in water flow is 10 percent of the change per minute. For
example, if the maximum (design) flow is 200 gpm and the flow is reduced to a minimum of 140 gpm,
the change in flow is 60 gpm, so the maximum change per minute would be 10% of 60, or 6 gpm per
minute. It would take ten minutes to change the flow through the entire range.
The water flow through the vessel must remain between the minimum and maximum values listed on
page 21. If flow drops below the minimum allowable, large reductions in heat transfer can occur. If the
flow exceeds the maximum rate, excessive pressure drop and tube erosion can occur.
Evaporator Freeze Protection
AGS chillers are equipped with thermostatically controlled evaporator heaters that help protect against
freeze-up down to -20°F (-28°C).
NOTE: The heaters come from the factory connected to the control power circuit. The control power
can be rewired in the field to a separate 115V supply (do not wire directly to the heater). See the field
wiring diagram on page 35. If this is done, mark the disconnect switch clearly to avoid accidental
deactivation of the heater during freezing temperatures. Exposed chilled water piping also requires
protection.
16
IMM AGSD3-1
For additional protection, at least one of the following procedures should be used during periods of
sub-freezing temperatures:
1. Adding of a concentration of a glycol anti-freeze with a freeze point 10 degrees F below the
lowest expected temperature. This will result in decreased capacity and increased pressure
drop.
Note: Do not use automotive grade antifreezes as they contain inhibitors harmful to chilled water
systems. Use only glycols specifically designated for use in building cooling systems.
2. Draining the water from outdoor equipment and piping and blowing the chiller tubes dry from
the chiller. Do not energize the chiller heater when water is drained from the vessel.
!
CAUTION
If fluid is absent from the evaporator, the evaporator heater must be de-energized to avoid
burning out the heater and causing damage from the high temperatures.
3. Providing operation of the chilled water pump, circulating water through the chilled water
system and through the evaporator.
Table 9, Freeze Protection
Temperature
°F (°°C)
Percent Volume Glycol Concentration Required
For Freeze Protection
For Burst Protection
Ethylene Glycol
Propylene Glycol
Ethylene Glycol
Propylene Glycol
16
18
11
12
25
29
17
20
33
36
22
24
39
42
26
28
44
46
30
30
48
50
30
33
52
54
30
35
56
57
30
35
60
60
30
35
20 (6.7)
10 (-12.2)
0 (-17.8)
-10 (-23.3)
-20 (-28.9)
-30 (-34.4)
-40 (-40.0)
-50 (-45.6)
-60 (-51.1)
Notes:
1. These figures are examples only and cannot be appropriate to every situation. Generally, for an extended margin of
protection, select a temperature at least 15°F lower than the expected lowest ambient temperature. Inhibitor levels should
be adjusted for solutions less than 25% glycol.
2. Glycol of less than 25% concentration is not recommended because of the potential for bacterial growth and loss of heat
transfer efficiency.
Operating Limits:
Maximum standby ambient temperature, 130°F (55°C)
Maximum operating ambient temperature, 125°F (51.7°C)
Minimum operating ambient temperature (standard), 35°F (2°C)
Minimum operating ambient temperature (optional low-ambient control), 0°F (-18°C)
Leaving chilled water temperature, 40°F to 60°F (4°C to 16°C)
Leaving chilled fluid range (with anti-freeze), 20°F to 60°F (-7°C to 16°C). Unloading is not permitted
with fluid leaving temperatures below 30°F (-1°C).
Operating Delta-T range, 6 degrees F to 16 degrees F (10.8 C to 28.8 C)
Maximum evaporator operating inlet fluid temperature, 76°F (24°C)
Maximum evaporator startup inlet fluid temperature, 90°F (32°C)
Maximum condenser water leaving temperature, 130°F (54.4°C) with ELWT above 25°F
Maximum non-operating inlet fluid temperature, 100°F (38°C)
NOTE: Contact the local McQuay sales office for operation outside any of these limits.
IMM AGSD3-1
17
Two series of units are available with the AGS-D chillers.
Standard Efficiency, designated by a "S" (or “M” with remote evaporator) as the last digit in the
model number following the “D” vintage designation (i.e. AGS 200DS or AGS 200DM) are designed
to meet ASHRAE 90.1 efficiency standard. They provide the lowest dollar per ton price.
High Efficiency, designated by an "E" (or “F” with remote evaporator) as the last digit in the model
number (i.e. AGS 200DE or AGS 200DF) are designed for high efficiency operation. The high
efficiency models have larger components, and/or more fans than the comparable standard efficiency
models. This results in improved efficiency and the ability to operate at higher ambient air
temperatures.
Flow Switch
A flow switch must be included in the chilled water
system to prove that there is adequate water flow to
the evaporator before the unit can start. It also serves
to shut down the unit in the event that water flow is
interrupted in order to guard against evaporator
freeze-up.
A solid state flow switch that is factory-mounted and
wired in the chiller leaving water nozzle is available
as an option.
Figure 16, Flow Switch
Flow direction
marked on switch
1" (25mm) NPT flow
switch connection
Tee
1 1/4" (32mm) pipe
dia. min. after
switch
1 1/4" (32mm)
pipe dia. min.
before switch
A flow switch for field mounting and wiring in the
leaving chilled water is also available as an option
from McQuay under ordering number 017503300. It is a paddle-type switch and adaptable to any pipe
size from 1" (25mm) to 8" (203mm) nominal.
Certain minimum flow rates are required to close the switch and are listed in Table 10. Installation
should be as shown in
Pipe Size
(NOTE !)
Min.
Adjst.
Max.
Adjst.
Flow
No
Flow
Flow
No
Flow
inch
mm
gpm
Lpm
gpm
Lpm
gpm
Lpm
gpm
Lpm
1 1/4
32 (2)
5.8
1.3
3.7
0.8
13.3
3.0
12.5
2.8
1 1/2
38 (2)
7.5
1.7
5.0
1.1
19.2
4.4
18.0
4.1
2
51
13.7
3.1
9.5
2.2
29.0
6.6
27.0
6.1
2 1/2
63 (3)
18.0
4.1
12.5
2.8
34.5
7.8
32.0
7.3
3
76
27.5
6.2
19.0
4.3
53.0
12.0
50.0
11.4
4
102 (4)
65.0
14.8
50.0
11.4
128.0
29.1
122.0
27.7
5
127 (4)
125.0
28.4
101.0
22.9
245.0
55.6
235.0
53.4
6
153 (4)
190.0
43.2
158.0
35.9
375.0
85.2
360.0
81.8
8
204 (5)
205.0
46.6
170.0
38.6
415.0
94.3
400.0
90.8
NOTES:
1. A segmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.
2. Flow rates for a 2-inch paddle trimmed to fit the pipe.
3. Flow rates for a 3-inch paddle trimmed to fit the pipe.
4. Flow rates for a 3-inch paddle.
5. Flow rates for a 6-inch paddle.
Figure 17
Electrical connections in the unit control center should be made at terminals 60 and 67 from switch
terminals Y and R. The normally open contacts of the flow switch should be wired between these two
terminals. Flow switch contact quality must be suitable for 24 VAC, low current (16ma). Flow switch
wire must be in separate conduit from any high voltage conductors (115 VAC and higher) and have an
insulation rating of 600 volts.
18
IMM AGSD3-1
Table 10, Flow Switch Flow Rates
Pipe Size
(NOTE !)
Min.
Adjst.
Max.
Adjst.
inch
mm
gpm
Lpm
gpm
Lpm
gpm
Lpm
gpm
Lpm
Flow
No
Flow
Flow
No
Flow
1 1/4
32 (2)
5.8
1.3
3.7
0.8
13.3
3.0
12.5
2.8
1 1/2
38 (2)
7.5
1.7
5.0
1.1
19.2
4.4
18.0
4.1
2
51
13.7
3.1
9.5
2.2
29.0
6.6
27.0
6.1
2 1/2
63 (3)
18.0
4.1
12.5
2.8
34.5
7.8
32.0
7.3
3
76
27.5
6.2
19.0
4.3
53.0
12.0
50.0
11.4
4
102 (4)
65.0
14.8
50.0
11.4
128.0
29.1
122.0
27.7
5
127 (4)
125.0
28.4
101.0
22.9
245.0
55.6
235.0
53.4
6
153 (4)
190.0
43.2
158.0
35.9
375.0
85.2
360.0
81.8
8
204 (5)
205.0
46.6
170.0
38.6
415.0
94.3
400.0
90.8
NOTES:
1. A segmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.
2. Flow rates for a 2-inch paddle trimmed to fit the pipe.
3. Flow rates for a 3-inch paddle trimmed to fit the pipe.
4. Flow rates for a 3-inch paddle.
5. Flow rates for a 6-inch paddle.
Figure 17, Typical Field Water Piping
Suction
Vent
Water
Strainer
In
Valved
Pressure
Gauge
Vibration
Eliminator
Out
Liquid
Drain
Flow
Gate
Valve
Flow
Protect All Field Piping
Against Freezing
Vibration Flow
Balancing Gate
Eliminator Switch
Valve Valve
Notes:
1.
2.
Connections for vent and drain fittings are located on the top and bottom of the evaporator.
Piping must be supported to avoid putting strain on the evaporator nozzles.
Refrigerant Charge
All packaged units are designed for use with R-134a and are shipped with a full operating charge. The
operating charge for each unit is shown in the Physical Data Tables beginning on page 22 for packaged
units, and page 50 for remote evaporator models. Model AGS-CM/CB with remote evaporators are
shipped with a full unit charge. Refrigerant must be added in the field for the evaporator and for the
refrigerant lines.
Glycol Solutions
When using glycol anti-freeze solutions the chiller's capacity, glycol solution flow rate, and pressure
drop through the evaporator can be calculated using the following formulas and tables.
Note: The procedure below does not specify the type of glycol. Use the derate factors found in Table
11 for corrections when using propylene glycol and those in Table 12 for ethylene glycol.
1. Capacity - Cooling capacity is reduced from that with plain water. To find the reduced value,
multiply the chiller’s water system tonnage by the capacity correction factor to find the chiller’s
capacity when using glycol.
2. Flow - To determine flow (or Delta-T) knowing Delta-T (or flow) and capacity:
GPM =
IMM AGSD3-1
(24 ) (tons ) ( flow
factor )
Delta − T
19
3. Pressure drop - To determine pressure drop through the evaporator when using glycol, enter the
water pressure drop curve at the water flow rate. Multiply the water pressure drop found there by
the "PD" factor to obtain corrected glycol pressure drop.
4. Power - To determine glycol system kW, multiply the water system kW by the factor designated
"Power".
Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in service
stations) to determine the freezing point. Obtain percent glycol from the freezing point table below. On
glycol applications, the supplier normally recommends that a minimum of 25% solution by weight be
used for protection against corrosion or that additional inhibitors should be employed.
NOTE: Do not use automotive antifreeze. Industrial glycols must be used. Automotive antifreeze
contains inhibitors that will cause plating on the copper tubes within the chiller evaporator. The type
and handling of glycol used must be consistent with local codes.
Table 11, Ethylene Glycol Factors
%
E.G.
Freeze
Point
o
o
F
C
Table 12, Propylene Glycol Factors
Capacity
Power
Flow
PD
% P.G.
Freeze
Point
o
o
F
C
Capacity Power
Flow
PD
10
26
-3.3
0.996
0.998
1.036
1.097
10
26
-3.3
0.991
0.996
1.016
1.092
20
18
-7.8
0.988
0.994
1.061
1.219
20
19
-7.2
0.981
0.991
1.032
1.195
30
7
-13.9
0.979
0.991
1.092
1.352
30
9
-12.8
0.966
0.985
1.056
1.345
40
-7
-21.7
0.969
0.986
1.132
1.532
40
-5
-20.6
0.947
0.977
1.092
1.544
50
-28 -33.3
0.958
0.981
1.182
1.748
50
-27
-32.8
0.932
0.969
1.140
1.906
Water Flow and Pressure Drop
Adjust the chilled water flow through the evaporator to meet specified conditions. The flow rates must
fall between the minimum and maximum values shown in the table on the following page. Flow rates
below the minimum values shown will result in laminar flow that will reduce efficiency, cause erratic
operation of the electronic expansion valve and could cause low temperature cutouts. On the other
hand, flow rates exceeding the maximum values shown can cause erosion on the evaporator water
connections and tubes.
Measure the chilled water pressure drop through the evaporator at field-installed pressure taps. It is
important not to include valve or strainer pressure drops in these readings.
20
IMM AGSD3-1
Figure 18, Evaporator Pressure Drops
Minimum/Nominal/Maximum Flow Rates
AGS
MODEL
MINIMUM FLOW
CURVE
NOMINAL FLOW
gpm
ft
l/s
kpa
gpm
MAXIMUM FLOW
ft
l/s
kpa
gpm
ft
l/s
kpa
63.2
Standard Efficiency
140DS/DM
A
201
3.72
12.7
11.1
321
8.51
20.2
25.4
535
21.18
33.7
160DS/DM
A
233
4.83
14.7
14.4
372
11.16
23.5
33.3
621
27.74
39.2
82.8
170DS/DM
A
246
15.5
2.8
8.4
393
24.8
6.8
20.3
655
41.3
20.5
61.2
190DS/DM
B
265
3.95 16.7 11.8
424
9.21
26.7
27.5
706
23.15
44.5
69.1
200DS/DM
B
283
4.49
17.9
13.4
453
10.42
28.6
31.1
756
26.24
47.7
78.3
210DS/DM
B
302
4.99
19.0
14.9
483
11.63
30.4
34.7
804
29.29
50.7
87.4
140DE/DF
A
217
4.26
13.7
12.7
347
9.82
21.9
29.3
578
24.43
36.5
72.9
170DE/DF
B
250
5.50
15.8
16.4
401
12.70
25.3
37.9
668
31.50
42.1
94.0
190DE/DF
B
279
4.36
17.6
13.0
447
10.15
28.2
30.3
744
25.53
47.0
76.2
High Efficiency
IMM AGSD3-1
21
Physical Data
Standard Efficiency
Table 13, Standard Efficiency, AGS 140DS – AGS 210DS
DATA
BASIC DATA
Unit Cap. @ ARI tons (kW)
Unit Operating Charge lbs (kg)
Cabinet Dimensions
L x W x H, in. (mm)
Unit Operating Weight, lbs. (kg)
Unit Shipping Weight, lbs (kg)
140DS
Ckt 1
160DS
Ckt 2
137.0 (481.9)
170 (77)
170 (77)
229.2x88x100.1
(5821x2235x2542)
10990 (4985)
10415 (4724)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
70 (246)
70 (246)
Minimum Capacity (% of Full Load)
12.5
Ckt 1
170DS
Ckt 2
EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
16x108 (406x2750)
Water Volume, gallons (liters)
65.8 (249.4)
Max. Water Pressure, psi (kPa)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
DATA
163.7 (575.8)
170 (77)
170 (77)
229.2x88x100.1
(5821x2235x2542)
10990 (4985)
10415 (4724)
70 (246)
85 (299)
85 (299)
12.5
BASIC DATA
Unit Cap. @ ARI, tons (kW)
Unit Operating Charge lbs (kg)
Cabinet Dimensions
L x W x H, in. (mm)
Unit Operating Weight (1), lbs. (kg)
Unit Shipping Weight(1), lbs (kg)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
Minimum Capacity (% of Full Load)
5
2.0 (1.5)
1140
8950 (45.5)
108630 (51280)
16x108 (406x2750)
65.8 (249.4)
152 (1048)
350 (2413)
399 (181)
399 (181)
131.8 (12.2) 131.8 (12.2)
5
5
2.0 (1.5)
1140
8950 (45.5)
108630 (51280)
16x108 (406x2750)
65.8 (249.4)
152 (1048)
350 (2413)
200DS
Ckt 2
Ckt 1
85 (299)
12.5
5
190DS
Ckt 1
Ckt 2
155.2 (545.9)
170 (77)
170 (77)
229.2x88x100.1
(5821x2235x2542)
10990 (4985)
10415 (4724)
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER
Pumpdown Capacity, lbs (kg)
399 (181)
399 (181)
399 (181)
399 (181)
Coil Inlet Face Area, sq. ft. (sq m.)
131.8 (12.2) 131.8 (12.2) 131.8 (12.2) 131.8 (12.2)
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan Dia.
5
5
Fan Motor hp (kW)
2.0 (1.5)
Fan & Motor RPM, 60Hz
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
108630 (51280)
Ckt 1
210DS
Ckt 2
Ckt 1
Ckt 2
176.5 (620.8)
190 (86)
190 (86)
267.4x88x100.1
(6792x2235x2542)
11730 (5321)
11170 (5067)
188.9 (664.4)
200 (91)
200 (91)
267.4x88x100.1
(6792x2235x2542)
11730 (5321)
11170 (5067)
201.1 (707.4)
200 (91)
200 (91)
267.4x88x100.1
(6792x2235x2542)
11730 (5321)
11170 (5067)
85 (299)
95 (335)
12.5
100 (352)
100 (352)
12.5
438 (199)
438 (199)
158.3 (14.7) 158.3 (14.7)
438 (199)
438 (199)
158.3 (14.7) 158.3 (14.7)
85 (299)
12.5
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE
Pumpdown Capacity, lbs (kg)
438 (199)
438 (199)
Coil Inlet Face Area, sq. ft. (sq m.)
158.3 (14.7) 158.3 (14.7)
95 (335)
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan Dia
6
6
Fan Motor -- hp (kW)
2.0 (1.5)
Fan & Motor RPM, 60Hz
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
130360 (61530)
6
2.0 (1.5)
1140
8950 (45.5)
130360 (61530)
6
2.5 (1.9)
1140
8950 (45.5)
137328 (64819)
EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
16x108 (406x2750)
Water Volume, gallons (liters)
63.6 (241)
Max. Water Pressure, psi (kPa)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
16x108 (406x2750)
63.6 (241)
152 (1048)
350 (2413)
16x108 (406x2750)
63.6 (241)
152 (1048)
350 (2413)
22
6
6
IMM AGSD3-1
High Efficiency
Table 14, High Efficiency, AGS 140DE – AGS 190DE
DATA
140DE
Ckt 1
170DE
Ckt 2
Ckt 1
190DE
Ckt 2
Ckt 1
Ckt 2
BASIC DATA
Unit Cap. @ ARI tons (kW)
Unit Operating Charge lbs (kg)
145.6 (512)
180 (82)
180 (82)
166.9 (586)
180 (82)
186.1 (654)
200 (91)
200 (91)
205 (93)
Cabinet Dimensions
267.4x88x100.1
267.4x88x100.1
267.4x88x100.1
L x W x H, in. (mm)
(6792x2235x2542)
(6792x2235x2542)
(6792x2235x2542)
Unit Operating Weight, lbs. (kg)
11730 (5321)
11730 (5321)
11730 (5321)
Unit Shipping Weight, lbs (kg)
11170 (5067)
11170 (5067)
11170 (5067)
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
70 (246)
Minimum Capacity (% of Full Load)
70 (246)
70 (246)
12.5
85 (299)
85 (299)
12.5
95 (335)
12.5
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER
Pumpdown Capacity, lbs (kg)
Coil Inlet Face Area, sq. ft. (sq m.)
438
(199)
158.3
(14.7)
438 (199)
438 (199)
438 (199)
438 (199)
438 (199)
158.3
(14.7)
158.3
(14.7)
158.3
(14.7)
158.3
(14.7)
158.3
(14.7)
6
6
6
6
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan Dia.
Fan Motor hp (kW)
Fan & Motor RPM, 60Hz
6
6
2.0 (1.5)
2.0 (1.5)
2.0 (1.5)
1140
1140
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
8950 (45.5)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
130360 (61530)
130360 (61530)
130360 (61530)
16x108 (406x2750)
16x108 (406x2750)
16x108 (406x2750)
65.8 (249.4)
65.8 (249.4)
63.6 (241)
EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
Water Volume, gallons (liters)
Max. Water Pressure, psi (kPa)
152 (1048)
152 (1048)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
350 (2413)
350 (2413)
IMM AGSD3-1
23
Dimensions & Weights
Standard Efficiency
Figure 19, Dimensions, AGS 140DS – 170DS
M2 L2
M4
L4
M6
88.0
86.0 NOTE 5.
NOTES:
INLET OUTLET
COMP
CIRC #1
55.9
EVAPORATOR
COMP
CIRC #2
NOTE 2.
M5
229.2
L3
203.6
213.6
2.0 NOTE 5.
0
173.4
118.6
80.0
M3
40.5
25.6
M1 L1
0
.750
QTY.6
NOTE 1.
100.1
95.0
CONTROL
PANEL
.875
FIELD CONTROL
CONNECTIONS
.875
POWER
KNOCKOUTS
Z
COG
COG
38.8
Y
17.1
0
88.0
0
60.3
64.3
68.3
2.
3.
4.
5.
ISOLATOR MOUNTING HOLE LOCATIONS ON BOTTOM
SURFACE OF UNIT BASE
LH EVAP SHOWN. RH OPTIONAL.
CONNECTIONS OPPOSITE SIDE.
EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED 2.0IN
FROM OUTSIDE EDGE OF UNIT BASE.
0
3.2
6.2
9.2
1.
NOTE 3.& 4
X
AGS140-170DS - 10 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE
NONE
3317178 B
DRAWING NUMBER
00
REV.
Table 15, AGS140-170DS Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
140-170DS
140-170DS
Aluminum
Copper
24
Lifting Weights
Mounting Weights
L1, L2 L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
lbs
3231
1977
2142
1924
1429
3590
2593
2363
2218
1889
Operating
Weight
Shipping
Weight
lbs
10990
12940
lbs
10415
12365
COG Dimensions
X
Y
Z
(in.)
(in.)
(in.)
90.95
39.07
44
96.23
43.01
44
IMM AGSD3-1
Figure 20, Dimensions, AGS 190DS – 210DS
M2 L2
M4
L4
M6
88.0
86.0 NOTE 5.
NOTES:
INLET
COMP
CIRC #1
OUTLET
55.9
EVAPORATOR
COMP
CIRC #2
NOTE 2.
2.0 NOTE 5.
0
267.4
217.7
M5
213.6
193.5
118.6
0
L3
M3
80.0
M1 L1
.750
QTY.6
NOTE 1.
40.5
2.
3.
4.
5.
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE
LH EVAP SHOWN. RH OPTIONAL.
CONNECTIONS OPPOSITE SIDE.
EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
25.6
1.
100.1
95.0
CONTROL
PANEL
.875
FIELD
CONTROL
KNOCKOUTS
COG
.875
POWER
KNOCKOUTS
Z
COG
38.8
Y
17.1
88.0
60.3
64.3
68.3
0
0
3.2
6.2
9.2
0
X
NOTE 3 & 4.
AGS190-210DS/AGS140-190DE - 12 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE NONE
*331717803001*
Table 16, AGS190-210DS Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
190-210DS
190-210DS
Aluminum
Copper
IMM AGSD3-1
Lifting Weights
Mounting Weights
L1, L2
L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
lbs
3348
2237
2102
2005
1758
3714
2938
2301
2307
2322
Operating
Weight
Shipping
Weight
lbs
11730
13860
lbs
11170
13305
COG Dimensions
X
Y
Z
(in.)
(in.)
(in.)
101.78 40.65
44
108.08 44.42
44
25
High Efficiency
Figure 21, Dimensions, AGS 140DE – 190DE
M2 L2
M4
L4
M6
88.0
86.0 NOTE 5.
NOTES:
INLET OUTLET
COMP
CIRC #1
55.9
EVAPORATOR
COMP
CIRC #2
NOTE 2.
2.0 NOTE 5.
0
267.4
217.7
M5
213.6
193.5
118.6
0
L3
M3
80.0
M1 L1
.750
QTY.6
NOTE 1.
40.5
2.
3.
4.
5.
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE
LH EVAP SHOWN. RH OPTIONAL.
CONNECTIONS OPPOSITE SIDE.
EVAPORATOR WATER CONNECTION SIZE IS 6" VICTAULIC.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
25.6
1.
100.1
95.0
CONTROL
PANEL
.875
FIELD
CONTROL
KNOCKOUTS
.875
POWER
KNOCKOUTS
Z
COG
COG
38.8
Y
17.1
X
88.0
60.3
64.3
68.3
0
0
3.2
6.2
9.2
0
NOTE 3 & 4.
AGS190-210DS/AGS140-190DE - 12 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE NONE
*331717803001*
Table 17, AGS140-190DE Shipping & Operating Weight, Center of Gravity Dimensions
Lifting Weights
AGS Model
Fin Type
140-190DE Aluminum
140-190DE
Copper
26
L1, L2
lbs
3348
3714
Mounting Weights
L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
2237
2102
2005
1758
2938
2301
2307
2322
Operating
Weight
Shipping
Weight
lbs
11730
13860
lbs
11170
13305
COG Dimensions
X
(in.)
101.78
108.08
Y
(in.)
40.65
44.42
Z
(in.)
44
44
IMM AGSD3-1
Electrical Data
Field Wiring
General
Wiring must comply with all applicable codes and ordinances. Warranty does not cover damage to the
equipment caused by wiring not complying with specifications.
An open fuse indicates a short, ground, or overload. Before replacing a fuse or restarting a compressor or
fan motor, the trouble must be found and corrected.
Copper wire is required for all power lead terminations at the unit, and copper must be used for all other
wiring to the unit.
AGS units can be ordered with main power wiring for either multiple-point power (standard) or single-point
connection (optional).
If the standard multiple-point power wiring is ordered, two separate power connections are made to the
disconnect switch on the power panel. See the dimension drawings beginning on page 22 for entry
locations. Separate disconnects are required for each electrical circuit if the McQuay optional factorymounted disconnects are not ordered.
If the optional single-point power connection is ordered, a single power connection is made to a power
block (or optional disconnect switch) in the unit power panel. A separate disconnect is required if the
McQuay optional factory-mounted disconnect is not ordered. Isolation circuit breakers for each circuit are
included.
It can be desirable to have the unit evaporator heaters on a separate disconnect switch from the main unit
power supply so that the unit power can be shut down without defeating the freeze protection provided by
the evaporator heaters. See the field wiring diagram on page 35 for connection details.
The 115-volt control transformer is factory mounted and wired.
!
CAUTION
If a separate disconnect is used for the 115V supply to the unit, it must power the entire control circuit,
not just the evaporator heaters. It must be clearly marked so that it is not accidentally shut off during cold
seasons. Freeze damage to the evaporator could result. If the evaporator is drained for winter freeze
protection, the heaters must be de-energized to prevent heater burnout.
!
CAUTION
AGS unit compressors are single-direction rotation compressors and can be damaged if rotated in the
wrong direction. For this reason, proper phasing of electrical power is important. Electrical phasing must
be A, B, C for electrical phases 1, 2 and 3 (A=L1, B=L2, C=L3) for single or multiple point wiring
arrangements. The solid-state starters contain phase reversal protection. DO NOT ALTER THE WIRING
TO THE STARTERS.
IMM AGSD3-1
27
Standard Efficiency
Table 18, Optional Single-Point Connection, Without Pump Package
AGS
UNIT
SIZE
140DS
160DS
170DS
190DS
200DS
210DS
POWER SUPPLY
MIN.
CIRCUIT
AMPACITY
(MCA)
QTY
WIRE GA
QTY
NOM. SIZE
RECOM.
MAX.
575
244
3
250 MCM
1
2.5
300
300
460
292
3
350 MCM
1
3.0
350
400
230
584
6
(2) 350 MCM
2
3.0
700
800
208
642
6
(2) 400 MCM
2
3.0
800
800
575
266
3
300 MCM
1
2.5
300
350
460
318
3
400 MCM
1
3.0
350
400
230
636
6
(2) 400 MCM
2
3.0
700
800
208
700
6
(2) 500 MCM
2
3.0
800
800
575
284
3
300 MCM
1
2.5
350
400
460
339
3
500 MCM
1
3.0
400
450
230
678
6
(2) 500 MCM
2
3.0
800
800
208
746
6
(2) 500 MCM
2
3.0
1000
1000
575
289
3
350 MCM
1
2.5
350
400
460
346
3
500 MCM
1
3.0
400
450
VOLTS
FIELD SUPPLIED
HUB (IN.)
FIELD WIRE
FIELD FUSE OR
BREAKER SIZE
230
691
6
(2) 500 MCM
2
3.0
800
800
208
761
12
(2) 2-250 MCM
2
3.0
1000
1000
575
323
3
400 MCM
1
3.0
400
450
460
386
6
(2) 3/0 AWG
2
2.0
450
500
230
772
12
(2) 2-250 MCM
2
3.0
1000
1000
208
852
12
(2) 2-300 MCM
2
3.5
1000
1000
575
348
3
500 MCM
1
3.0
400
450
460
416
6
(2) 4/0 AWG
2
2.5
500
500
Notes
1.
Table based on 75°C field wire. Complete notes are on page 34.
2.
Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.
3.
The AGS 200DS/M is only available with a solid state starter for 208V and 230V applications. Model AGS 210DS/M
is not available for 208/230 volt applications.
Table 19, Multiple-Point Connection, Without Pump Package
ELECTRICAL CIRCUIT 1 (COMPRESSOR 1)
ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)
FIELD FUSE
MIN.
POWER SUPPLY
POWER SUPPLY
FIELD FUSE
MIN.
AGS
OR
CIRCUIT
CIRCUIT
OR BREAKER
UNIT VOLTS
BREAKER
AMPFIELD
FIELD
AMPSIZE
SIZE
ACITY
FIELD WIRE SUPPLIED
FIELD WIRE
SUPPLIED
SIZE
ACITY
(MCA)
HUB (IN.)
HUB (IN.)
(MCA)
NOM.
NOM.
QTY WIRE GA QTY
QTY WIRE GA QTY
REC. MAX.
REC. MAX.
SIZE
SIZE
140DS
160DS
575
134
3
1/0 AWG
1
1.5
175
225
134
3
1/0 AWG
1
1.5
175
225
460
160
3
2/0 AWG
1
2
200
250
160
3
2/0 AWG
1
2
200
250
230
321
3
400 MCM
1
3
400
500
321
3
400 MCM
1
3
400
500
208
353
3
500 MCM
1
3
450
600
353
3
500 MCM
1
3
450
600
575
134
3
1/0 AWG
1
1.5
175
225
157
3
2/0 AWG
1
1.5
200
250
460
160
3
2/0 AWG
1
2
200
250
187
3
3/0 AWG
1
2
225
300
230
321
3
400 MCM
1
3
400
500
373
3
500 MCM
1
3
450
600
208
353
3
500 MCM
1
3
450
600
411
6
(2) 4/0 AWG
2
2.5
500
700
(Continued next page.)
28
IMM AGSD3-1
Multiple-Point Connection, Without Pump Package (continued)
ELECTRICAL CIRCUIT 1 (COMPRESSOR 1)
AGS
UNIT
SIZE
170DS
190DS
200DS
210DS
ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)
FIELD
POWER SUPPLY
POWER SUPPLY
FUSE OR
MIN.
MIN.
FIELD
FIELD
VOLTS CIRCUIT
BREAKER CIRCUIT
FIELD WIRE
SUPPLIED
FIELD WIRE
SUPPLIED
AMPACITY
AMPACITY
SIZE
HUB (IN.)
HUB (IN.)
(MCA)
(MCA)
NOM.
NOM.
QTY
WIRE GA
QTY
REC. MAX.
QTY
WIRE GA QTY
SIZE
SIZE
FIELD FUSE
OR
BREAKER
SIZE
REC. MAX.
575
157
3
2/0 AWG
1
1.5
200
250
157
3
2/0 AWG
1
1.5
200
460
187
3
3/0 AWG
1
2
225
300
187
3
3/0 AWG
1
2
225
250
300
230
373
3
500 MCM
1
3
450
600
373
3
500 MCM
1
3
450
600
208
411
6
(2) 4/0 AWG
2
2.5
500
700
411
6
(2) 4/0 AWG
2
2.5
500
700
575
159
3
2/0 AWG
1
1.5
200
250
159
3
2/0 AWG
1
1.5
200
250
460
190
3
3/0 AWG
1
2
225
300
190
3
3/0 AWG
1
2
225
300
230
380
3
500 MCM
1
3
450
600
380
3
500 MCM
1
3
450
600
208
418
6
(2) 4/0 AWG
2
2.5
500
700
418
6
(2) 4/0 AWG
2
2.5
500
700
575
178
3
3/0 AWG
1
2
225
300
178
3
3/0 AWG
1
2
225
300
460
212
3
4/0 AWG
1
2
300
350
212
3
4/0 AWG
1
2
300
350
230
425
6
(2) 4/0 AWG
2
2.5
600
700
425
6
(2) 4/0 AWG
2
2.5
600
700
208
469
6
(2) 250 MCM
2
2.5
600
800
469
6
(2) 250 MCM
2
2.5
600
800
575
191
3
3/0 AWG
1
2
250
300
191
3
3/0 AWG
1
2
250
300
460
228
3
4/0 AWG
1
2
300
350
228
3
4/0 AWG
1
2
300
350
Notes
1. Table based on 75°C field wire. Complete notes are on page 34.
2. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.
3. The AGS200DS/M is only available with a solid state starter for 208V and 230V applications. Wye-Delta starters are not available for
208V and 230V applications for this model. Model AGS 210DS/M is not available for 208/230 volt applications.
Table 20, Std. Efficiency, Compressor and Condenser Fan Motor Amp Draw
AGS
UNIT
SIZE
140DS
160DS
170DS
190DS
VOLTS
FAN MTRS
Solid State
Wye-Delta
QTY
FLA
(EA)
LRA
(EA)
Inrush / LRA (Note X)
LRA
CIRC. #1
CIRC. #2
CIRC. #1
CIRC. #2
297 / 821
297 / 821
257 / 821
257 / 821
RATED LOAD
AMPS
CIRC. #1 CIRC. #2
575
98
98
10
2.4
12.8
460
115
115
10
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
230
230
10
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
253
253
10
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
98
116
10
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
115
136
10
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
230
272
10
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
253
299
10
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
116
116
10
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
136
136
10
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
272
272
10
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
299
299
10
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
116
116
12
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
136
136
12
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
272
272
12
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
299
299
12
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
(Continued next page)
IMM AGSD3-1
29
Std. Efficiency, Compressor and Condenser Fan Motor Amp Draw (Continued)
AGS
UNIT
SIZE
200DS
210DS
VOLTS
FAN MTRS
Solid State
QTY.
FLA
(EA)
LRA
(EA)
Inrush / LRA (Note X)
CIRC. #1
CIRC. #2
CIRC. #1
CIRC. #2
257 / 821
RATED LOAD AMPS
CIRC. #1 CIRC. #2
Wye-Delta
LRA
575
131
131
12
2.4
12.8
297 / 821
297 / 821
257 / 821
460
154
154
12
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
308
308
12
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
340
340
12
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
139
139
12
3
20.0
297 / 821
297 / 821
257 / 821
257 / 821
460
163
163
12
4.1
23.0
349 / 893
349 / 893
288 / 893
288 / 893
Notes:
1.
2.
3.
4.
5.
For solid state starters, inrush amps are determined by the solid state starter.
Table based on 75°C field wire.
Complete notes are on page 34.
The AGS200DS/M is only available with a solid state starter for 208V and 230V applications.
Model AGS 210DS/M is not available for 208/230 volt applications.
Table 21, Standard Efficiency, Customer Wiring Information w/ Single-Point Power
AGS
UNIT
SIZE
140DS
160DS
170DS
190DS
200DS
210DS
POWER BLOCK
DISCONNECT SWITCH
(Std. Short Circuit Current Rating) (Std. Short Circuit Current Rating)
VOLTS TERMINAL
TERMINAL
CONNECTION LUG
SIZE
SIZE
RANGE PER PHASE
AMPS
AMPS
CONNECTION LUG
RANGE PER PHASE
DISCONNECT SWITCH (High
Interrupt or High Short Circuit
Current Rating)
TERMINAL CONNECTION LUG
SIZE AMPS RANGE PER PHASE
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
400
#3/0-500kcmil (2/PH)
460
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1000
250-500kcmil (4/PH)
208
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil (4/PH)
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
450
#3/0-500kcmil(2/PH)
460
380
#4 - 500kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
208
1400
1/0 - 750kcmil (4/PH)
1200
250-500kcmil (4/PH)
1400
300-600kcmil(5/PH)
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
460
380
#4 - 500kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
208
1400
1/0 - 750kcmil (4/PH)
1200
250-500kcmil (4/PH)
1400
300-600kcmil(5/PH)
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
460
620
#6 - 500kcmil (2/PH)
400
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
208
1400
1/0 - 750kcmil (4/PH)
1200
250-500kcmil (4/PH)
1400
300-600kcmil(5/PH)
575
380
#4 - 500kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
460
620
#6 - 500kcmil (2/PH)
600
#3/0-500kcmil (2/PH)
700
#1/0 - 500kcmil(3/PH)
230
1400
#1 - 500kcmil (2/PH)
1200
250-500kcmil (4/PH)
1400
300-600kcmil(5/PH)
208
1400
1/0 - 750kcmil (4/PH)
1200
250-500kcmil (4/PH)
1400
300-600kcmil(5/PH)
575
620
#6 - 500kcmil (2/PH)
600
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
460
620
#6 - 500kcmil (2/PH)
600
#3/0-500kcmil (2/PH)
700
#1/0 - 500kcmil(3/PH)
Notes:
1. Terminal size amps are the maximum amps that the power block is rated for.
2. Complete notes are on page 34.
3. Data based on 75°C wire.
4. Model AGS 210DS/M is not available for 208/230 volt applications.
30
IMM AGSD3-1
Table 22, Standard Efficiency, Wiring w/ Std. Multi-Point Disconnect Switches
AGS
UNIT
SIZE
140DS
160DS
170DS
190DS
200DS
210DS
DISCONNECT SW-CIRCUIT #1
DISCONNECT SW-CIRCUIT #2
VOLTS
TERMINAL
SIZE AMPS
CONNECTION LUG
RANGE PER PHASE
TERMINAL
SIZE AMPS
CONNECTION LUG
RANGE PER PHASE
575
225
#6 - 350 kcmil Cu
225
#6 - 350 kcmil Cu
460
300
#3/0 - 500 kcmil Cu (2/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
230
600
#3/0 - 500 kcmil Cu (2/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
208
600
#3/0 - 500 kcmil Cu (2/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
575
200
#6 - 350kcmil (1/PH)
225
#6 - 350 kcmil Cu
460
225
#6 - 350kcmil (1/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
230
450
#3/0-500kcmil(2/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
208
500
#3/0-500kcmil(2/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
575
300
#3/0 - 500 kcmil Cu (2/PH)
225
#6 - 350 kcmil Cu
460
350
#3/0 - 500 kcmil Cu (2/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
230
700
#1/0 - 500 kcmil (3/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
208
700
#1/0 - 500 kcmil (3/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
575
300
#3/0 - 500 kcmil Cu (2/PH)
225
#6 - 350 kcmil Cu
460
350
#3/0 - 500 kcmil Cu (2/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
230
700
#1/0 - 500 kcmil (3/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
208
700
#1/0 - 500 kcmil (3/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
575
300
#3/0 - 500 kcmil Cu (2/PH)
250
#6 - 350 kcmil Cu
460
350
#3/0 - 500 kcmil Cu (2/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
230
700
#1/0 - 500 kcmil (3/PH)
600
#3/0 - 500 kcmil Cu (2/PH)
208
800
#1/0 - 500 kcmil (3/PH)
700
#1/0 - 500 kcmil (3/PH)
575
350
#3/0 - 500 kcmil Cu (2/PH)
300
#3/0 - 500 kcmil Cu (2/PH)
460
400
#3/0 - 500 kcmil Cu (2/PH)
350
#3/0 - 500 kcmil Cu (2/PH)
NOTES:
1. Terminal size amps are the maximum amps that the power block is rated for.
2. Complete notes are on page 34.
3. Data based on 75°C wire.
4. Model AGS 210DS/M is not available for 208/230 volt applications.
IMM AGSD3-1
31
High Efficiency
Table 23, High Efficiency, Electrical Data, Optional Single-Point
POWER SUPPLY
FIELD WIRE
FIELD SUPPLIED HUB (IN.)
WIRE GA
QTY
NOM. SIZE
FIELD FUSE OR
BREAKER SIZE
RECOM.
MAX.
AGS
UNIT
SIZE
VOLTS
MIN. CIRCUIT
AMPACITY
(MCA)
QTY
140DE
575
460
230
208
249
298
597
657
3
3
6
6
250 MCM
350 MCM
(2) 350 MCM
(2) 400 MCM
1
1
2
2
2.5
3
3
3
300
350
700
800
300
400
800
800
170DE
575
460
230
208
271
325
649
715
3
3
6
6
300 MCM
400 MCM
(2) 400 MCM
(2) 500 MCM
1
1
2
2
2.5
3
3
3
300
350
700
800
350
400
800
800
190DE
575
460
230
208
308
368
736
812
3
3
6
12
350 MCM
500 MCM
(2) 500 MCM
(2) 2-250 MCM
1
1
2
2
2.5
3
3
3
350
400
800
1000
400
500
800
1000
Notes
1. Table based on 75°C field wire.
2. Complete notes are on page 34.
3. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.
Table 24, High Efficiency, Electrical Data, Standard Multi-Point Connection
ELECTRICAL CIRCUIT 1 (COMPRESSOR 1)
AGS
MIN.
UNIT VOLTS CIRCUIT
AMPACITY
SIZE
(MCA)
POWER SUPPLY
QTY
140DE
170DE
190DE
FIELD
SUPPLIED
HUB (IN.)
NOM.
WIRE GA QTY
SIZE
FIELD WIRE
575
137
3
460
164
230
327
208
575
ELECTRICAL CIRCUIT 2 (COMPRESSOR 2)
FIELD FUSE
OR.
MIN.
BREAKER
CIRCUIT
AMPACITY
SIZE
(MCA)
REC. MAX.
POWER SUPPLY
FIELD WIRE
FIELD
SUPPLIED
HUB (IN.)
NOM.
QTY
SIZE
FIELD FUSE
OR.
BREAKER
SIZE
QTY
WIRE GA
REC. MAX.
1/0 AWG
1
1.5
175
225
1/0 AWG
1
1.5
175
225
137
3
3
2/0 AWG
1
1.5
200
250
164
3
2/0 AWG
1
1.5
200
250
3
400 MCM
1
3.0
400
500
327
3
400 MCM
1
3.0
400
500
360
3
500 MCM
1
3.0
450
600
360
3
500 MCM
1
3.0
450
600
137
3
1/0 AWG
1
1.5
175
225
159
3
2/0 AWG
1
1.5
200
250
460
164
3
2/0 AWG
1
1.5
200
250
190
3
3/0 AWG
1
2
225
300
230
327
3
400 MCM
1
3.0
400
500
380
3
500 MCM
1
3
450
600
208
360
3
500 MCM
1
3.0
450
600
418
6
(2) 4/0 AWG
2
2.5
500
700
575
159
3
2/0 AWG
1
1.5
200
250
178
3
3/0 AWG
1
2
225
300
460
190
3
3/0 AWG
1
2.0
225
300
212
3
4/0 AWG
1
3.5
300
350
230
380
3
1
3.0
450
600
425
6
(2) 4/0 AWG
2
2.5
600
700
208
418
6
500 MCM
(2) 4/0
AWG
2
2.5
500
700
469
6
(2) 250 MCM
2
2.5
600
800
Notes:
1. Table based on 75°C field wire.
2. Complete notes are on page 34.
3. Recommended fuse size is for ambient temperatures up to 105°F. Use maximum fuse size above 105°F.
32
IMM AGSD3-1
Table 25, High Efficiency, Compressor and Condenser Fan Motor Amp Draw
AGS
UNIT
SIZE
140DE
170DE
190DE
RATED LOAD AMPS
VOLTS
CIRC. #1
CIRC.#2
Solid State
Inrush / LRA (Note X)
FAN MTRS
QTY> FLA (EA)
Wye-Delta
LRA
LRA (EA)
CIRC.#1
CIRC.#2
CIRC.#1
CIRC.#2
575
98
98
12
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
115
115
12
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
230
230
12
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
253
253
12
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
98
116
12
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
115
136
12
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
230
272
12
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
253
299
12
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
575
116
131
12
2.4
12.8
297 / 821
297 / 821
257 / 821
257 / 821
460
136
154
12
3.3
20.0
349 / 893
349 / 893
288 / 893
288 / 893
230
272
308
12
6.6
40.0
698 / 1852
698 / 1852
579 / 1852
579 / 1852
208
299
340
12
7.3
40.0
768 / 2352
768 / 2352
735 / 2352
735 / 2352
Notes:
1. Table based on 75°C field wire.
2. For solid state starters, inrush amps are determined by the solid state starter.
3. Complete notes are on page on page 34.
Table 26, High Efficiency, Customer Wiring Information, Optional Single-Point Power
AGS
UNIT
SIZE
140DE
170DE
190DE
DISCONNECT SWITCH (High
Interrupt or High Short Circuit
Current Rating)
POWER BLOCK
DISCONNECT SWITCH
(Std. Short Circuit Current Rating)
(Std. Short Circuit Current Rating)
TERMINAL
SIZE AMPS
CONNECTION LUG
RANGE PER PHASE
TERMINAL
SIZE AMPS
CONNECTION LUG
RANGE PER PHASE
TERMINAL
SIZE AMPS
CONNECTION LUG
RANGE PER PHASE
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
400
#3/0-500kcmil(2/PH)
460
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
230
620
#6 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1000
250-500kcmil(4/PH)
208
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1000
250-500kcmil(4/PH)
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
450
#3/0-500kcmil(2/PH)
460
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1000
250-500kcmil(4/PH)
208
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
575
335
#6 - 400kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
500
#3/0-500kcmil(2/PH)
460
380
#4 - 500kcmil (1/PH)
400
#3/0-500kcmil (2/PH)
600
#3/0-500kcmil(2/PH)
230
760
#2 - 500kcmil (2/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
208
1400
1/0 - 750kcmil (4/PH)
800
#1-500kcmil (3/PH)
1200
250-500kcmil(4/PH)
VOLTS
Notes:
1. Terminal size amps are the maximum amps that the power block is rated for.
2. Complete notes are on page 34.
3. Data based on 75°C wire.
IMM AGSD3-1
33
Table 27, High Efficiency, Wiring w/ Standard Multi-point Power and Disconnect Switches
AGS
UNIT
SIZE
40DE
170DE
190DE
DISCONNECT SW-CIRCUIT #1
VOLTS
575
460
230
208
575
460
230
208
575
460
230
208
TERMINAL
SIZE
AMPS
200
250
500
500
200
250
500
500
225
300
600
600
CONNECTION LUG
RANGE PER PHASE
#6 - 350 kcmil Cu (1/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#6 - 350 kcmil Cu (1/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
DISCONNECT SW-CIRCUIT #2
TERMINAL
SIZE
AMPS
200
250
500
500
225
300
600
700
225
300
600
700
CONNECTION LUG
RANGE PER PHASE
#6 - 350 kcmil Cu (1/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#6 - 350 kcmil Cu (1/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
#3/0 - 500 kcmil Cu (2/PH)
Notes:
1. Terminal size amps are the maximum amps that the power block is rated for.
2. Complete notes are on page 34.
3. Data based on 75°C wire.
Electrical Data Notes
1. The field wire size designation is explained in the table to the right that defines the number of wires and
conduit recommended. A “2” in parenthesis (2) indicates that two conduits are required.
2. Allowable voltage limits
Sample
No. of Wires No. of Conduit
Unit nameplate 208V/60Hz/3PH: 187V to 229V
350 MCM
3
1
Unit nameplate 230V/60Hz/3Ph: 207V to 253V
2-250 MCM
6
1
Unit nameplate 460V/60Hz/3Ph: 414V to 506V
(2) 250 MCM
6
2
Unit nameplate 575V/60Hz/3Ph: 517V to 633V
(2) 2-250 MCM
12
2
Maximum of 2 percent voltage unbalance.
3. Unit wire size ampacity (MCA) is equal to 125% of the
largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit. Wire size ampacity for
separate 115V control circuit power is 15 amps.
4. Compressor RLA values are for wire sizing purposes only but do reflect normal operating current draw at
unit rated capacity.
5. Single point power supply requires a single disconnect to supply electrical power to the unit.
6. Multiple point power supply requires two independent power circuits.
7. All field wiring to unit power block or optional non-fused disconnect switch must be copper.
8. Field wire size values given in tables apply to 75°C rated wire per NEC.
9. External disconnect switches or breakers must be field supplied.
Note: On single point power units a non-fused disconnect switch in the cabinet is available as an option.
10. All wiring must be done in accordance with applicable local and national codes.
11. Recommended time delay fuse size or breakers is equal to 175% of the largest compressor motor RLA
plus 100% of remaining compressor RLAs and the sum of condenser fan FLAs.
12. Maximum time delay fuse size or breakers is equal to 225% of the largest compressor-motor RLA plus
100% of remaining compressor RLAs and the sum of condenser fan FLAs.
Power Limitations:
1. Voltage within ± 10 percent of nameplate rating.
2. Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times the voltage
unbalance per NEMA MG-1, 1998 Standard.
Circuit Breakers
The circuit breaker used in the High Short Circuit panel option may have a higher trip rating than the unit
Maximum Overload Protection (MOP) value shown on the unit nameplate. The circuit breaker is installed as
a service disconnect switch and does not function as branch circuit protection, mainly that the protection
device must be installed at the point of origin of the power wiring. The breaker (disconnect switch) is
oversized to avoid nuisance trips at high ambient temperature conditions.
34
IMM AGSD3-1
Field Wiring Diagram
Figure 22, Typical Field Wiring Diagram
Continued next page
IMM AGSD3-1
Continued next page
35
Typical Field Wiring Diagram, Continued
Continued from previous page
36
Continued from previous page
IMM AGSD3-1
Figure 23, AGS 120C - 210C Unit Controller Schematic
812
75
800
MJ
813
60
801
PE
802
GO
J1
G
PE
SHIELD
OUTSIDE AIR TEMP (S07)
BLK
RED
DEMAND LIMIT (S10)
4-20MA
73
EVAP. WATER TEMP. RESET (S11)
4-20MA
69
71
70
72
70
70
803
B1
804
B2
805
806
B3
GND
814
+VDC
J2
J11
BA+
PE
SHIELD
GND
EVAP. LEAVING WATER TEMP (S08)
EVAP. ENTERING WATER TEMP (S09)
BLK
B4
RED
BLK
BC4 J3
B5
RED
BC5
J4
D IG IT AL OU T P U TS
J12 NO2
808
EVAPORATOR
PUMP 2
WJ
C4
NO4
J13
NO5
ID1
NO6
809
ID2
810
ID3
811
ID4
C4
66
RS1
CHWI
EVAP. FLOW SWITCH
EVAPORATOR
PUMP 1
C1
897
REMOTE SWITCH
60
GROUND
NO3
S1
807
WHITE
C1
NO1
UNIT SWITCH
BLACK
67
MODE SWITCH
C7
68
MS1
J14 NO7
ID5 J5
C7
FACTORY
INSTALLED
FLOW
SWITCH
60
67
BRN
ID6
WHT
BLU
75
ID7
NO8
J15 C8
ID8
800
UNIT
ALARM
IDC1
NC8
CONTROLLER
IMM AGSD3-1
37
Unit Controller Schematic Continued
1
LINE CONTACT
NO. LOCATION
2
TERMINAL BLOCK
AND LEAD NUMBERS
-301
FU12
890
1
115V OUTLET
B W
G
2
REC
891
PE
MJ
HTR-EVAP
1
851
2
HEATER
1
1
820
2
1
TS
FU10
853
2
5
LOAD 1
1
1
2
2
60
60
60
75
75
60
60
2
2
2
820, 822, 850
853, 890
821, 891
852, 855
801, 807
897, 830
812
800, 802, 813
66
67
897, 809
810
68
69
70
71
72
73
81
82
83
84
85
811
803
806
804
805
814
829
823
851, F2-2
854, F3-2
824
-305
-306
24V
-308
2
HEATER
1
T2
1 120V
852
-309
-310
-311
C-BOX
854
LINE 1
TB1
-303
-304
-307
83
FU11
850
-302
2
1
2
855
-312
-313
VFD ONLY
MJ
2
6
LINE 2
821
LOAD 2
-314
2
-315
-316
-317
-318
-319
-320
(p LAN) TO CIRCUIT CONTROL BOXES
BLACK
-321
WHITE
-322
-323
-324
GROUND
(TERMINATE AT EACH CONTROLLER)
-325
-326
-327
1
822
EVAPORATOR PUMP 1
EVAPORATOR PUMP 2
823
(SEE LINE 301)
82
-328
CHWR
-329
120V
-330
-331
85
824
CHWR
120V
-332
-333
-334
-335
-336
-337
-338
-339
-340
-341
-342
-343
NOTE:
TB1-75 THRU
TB1-89 ARE
FIELD
WIRING
TERMINALS.
-344
-345
-346
-347
-348
-349
-350
-351
-352
-353
-354
-355
UNIT ALARM
829
830
60
-356
-357
75
81
ABR
(SEE LINE 306)
(SEE LINE 307)
-358
-359
-360
-361
-362
SCHEM. 330590301 REV. 0D
38
-363
-364
IMM AGSD3-1
Figure 24, AGS 120C - 210C Circuit Controller Schematic
(SEE LINE 693)
TO T5
116
1
1
114
20
T3
120V 2
120
5
24V
113
40
121
6
139 (SEE LINE 687)
MJ
MJ
40
123
122
GO
G
0-5 VDC
RED
WHT
BLK
0-5 VDC
RED
WHT
BLK
J1
MJ
EVAP PRESS TRANSDUCER (S01)
J1
DISCHARGE PRESS TRANSDUCER (S02)
J2
J2
J3
BIAS 5
BIAS G
SLIDE LOAD
INDICATOR
882
883
137
138
25
26
21 VDC
DC GROUND
1
2
3
1
J4
3
J5
1
J11
SUCTION TEMP. (S04)
B4
BC4
B5
BC5
RED
BLK
RED
DISCHARGE TEMP. (S05)
120
OHMS
J3
A+
GND
PE
SHIELD
124
VG
125
VGD
141
Y1
1
N/A ON NON-VFD UNITS
140
C1
0-10VDC
FAN VFD
J4
Y2
0-10VDC
EXV DRIVER
BLACK
SASB+
SCOM
SHLD
COM
165
NO
TB191
142
143
PE
GRN
BLK
DIFFERENTIAL PRESSURE SWITCH
MECHANICAL HIGH PRESSURE FAULT
DPS
C
1
165
TB129
143
N/A ON NON-VFD UNITS
WHT
21
2
4
165
WJ
ID3
143
ID4
129
ID5
131
ID6
J5
ID7
ID8
132
FAN 3
C4
NO4
29
FAN 2
C1
ID1
MHPR
130
NO3
ID2
91
FAN 1
B-
128
FLT
164
GND
A+
WHITE
GREEN
CS
TB190
164
TB128
142
J12 NO2
IDC1
D IGIT A L OU TPU TS
127
STARTER FAULT
Y3
Y4
D3
CIRCUIT SWITCH
NO1
N/A ON VFD UNITS
126
(SEE DETAIL 1)
VFD FAULT
B-
J13 NO5
NO6
FAN 4
FAN 5
FAN 6
C4
C7
J14 NO7
C7
B6
SLIDE LOAD
INDICATOR
4-20MA
3
MJ
MJ
NO8
24
133
B7
J6
J15 C8
B8
NC8
22
3
20
2
PE
GREEN
134
GND
135
ID9
C9
OLS
NO9
ID10
1
J16 NO10
ID11 J7
NO11
DETAIL 2 - THERMISTOR CARD
J3-1
171
1
J3-2
40
136
NO12
IDC9
2
J17 C12
LP*
ID13H
REMOTE EVAP. ONLY.
IN SERIES WITH 170
ID13
IDC13
NOTES: 1) * - REPRESENTS CIRCUIT
2) ONE HUNDRED SERIES FOR CIRCUIT #1
3) TWO HUNDRED SERIES FOR CIRCUIT #2
IMM AGSD3-1
ID14
OIL SEP.
HEATER
C9
ID12
MOTOR
GUARDISTOR
170
COMPRESSOR
SSS CONTACT
188
185
NC12
NO13
J8
J18 C13
ID14H
NC13
(LOWER LEVEL)
CONTROLLER
39
Circuit Controller Schematic Continued
FU7
105
2
1
NB
103
T1
115V
102
101
2
117
(SEE LINE 694)
D3 CARD
41
120V
10
41
9
93
174
1
178
2
179
SV
LIQ
FIELD INSTALLED ON REMOTE EVAPORATOR
BIAS
BLOCK
(p LAN) TO OTHER CIRCUIT CONTROLLERS AND UNIT CONTROLLER
BLACK
-
880 TO UNIT CONTROLLER B-
(RESISTOR USED ONLY AT END OF DAISY CHAIN)
+
881 TO UNIT CONTROLLER A+
WHITE
5
882 TO CIRCUIT CONTROLLER J4
G
883 TO CIRCUIT CONTROLLER J4
GROUND
(TERMINATE AT EACH CONTROLLER)
CB11
180
MHP
3
181
1
MHPR
4
182
2
183
0
1
184
144
M*1
C1
146
M*2
C1
148
M*3
C1
150
M*5
M*6
C1
1
160
5
162
185
24V
161
163
PE
GRN
1
LOAD SOLENOID
2
SV
PE
2
GRN
1
UNLOAD SOLENOID
1
155
C2
6
1
28
153
C2
T4
120V 2
(SEE LINE 690)
27
151
C2
C1
154
USED ON AGS210 UNITS ONLY
173
149
C2
M*4
152
USED ON AGS130-210 UNITS ONLY
172
147
C2
C1
(TO TB1-1)
145
C2
2
2
SV
50
SSS RUN
186
CB12
175
176
30
HTR-OIL SEP.
177
HEATER
1
ECONOMIZER
49
189
SV
190
187
K1
AGS190-210C
ONLY
50
2
197
ANALOG OUTPUT J4-Y3
126
TB1-40 139
FIELD
CONNECTED
REMOTE
EVAPORATOR
TO: TB1-2 117
191
192
-
PID
BLACK
WHITE
EXV
MOTOR
TO: TB1-1 116
+
GREEN
RED
1 5
120V
2 6
T5
195
+
196
-
DETAIL 1
EXV
DRIVER
24V AC
24V AC
PUMPDOWN
PUMPDOWN
LINE
NO.
-601
-602
-603
-604
-605
-606
-607
-608
-609
-610
-611
-612
-613
-614
-615
-616
-617
-618
-619
-620
-621
-622
-623
-624
-625
-626
-627
-628
-629
-630
-631
-632
-633
-634
-635
-636
-637
-638
-639
-640
-641
-642
-643
-644
-645
-646
-647
-648
-649
-650
-651
-652
-653
-654
-655
-656
-657
-658
-659
-660
-661
-662
-663
-664
-665
-666
-667
-668
-669
-670
-671
-672
-673
-674
-675
-676
-677
-678
-679
-680
-681
-682
-683
-684
-685
-686
-687
-688
-689
-690
-691
-692
-693
-694
-695
-696
-697
-698
-699
-700
-701
TERMINAL BLOCK
AND LEAD NUMBERS
TB*1
1
1
2
2
2
2
3
4
20
20
21
22
24
25
26
27
28
29
30
93
49
40
40
40
50
91
PE
PE
105, 114, 116, 160
180
183, 145
147, 149, 151, 153
155, 161, 187, 197
113, 101, 117, 179
181, MHP-1
MHP-2, 182, 184
122, 124, 127
142, BLK, 130, 2-OIL
WHT, 129
3-OIL, 135
3-SLIDE, 133
1-SLIDE, 137
2-SLIDE, 138
172, 1-LOAD
173, 1-UNLOAD
143
176, 177
174, 178
188, 189
123, 125, 140
132, RED, 134
1-OIL, 136, 139
163, 2-LOAD, 2-UNLOAD, 190
165
GRN - OIL, DPS
GRN, LOAD, UNLOAD
SCHEM. 330590401 REV. 0D
40
IMM AGSD3-1
Remote Evaporator
This section contains data that is unique to AGS-DM/F remote evaporator models including:
• Refrigerant piping on page 41.
• Dimensions on page 45.
• Vibration isolators on page 52.
• Physical data on page 50.
Data common to both packaged and remote evaporator models are:
• Electrical data on page 27.
• Evaporator pressure drop, on page 21.
Piping Layout
Figure 25 shows the piping layout for one of the two refrigerant circuits for AGS units with a remote
evaporator. Economizers may or may not be on any given circuit.
NOTE: The liquid line refrigerant specialties must be field installed adjacent to the evaporator.
The outdoor unit, the evaporator, and a kit of refrigerant components are shipped as separate pieces.
The outdoor unit will have a refrigerant charge equal to that of a packaged unit pumped down into the
condenser. The additional charge of refrigerant and oil required by the field piping is supplied and
installed by the customer.
The location and size of the refrigerant (and water) connections are shown on the dimension drawings
beginning on page 45. Looking at the control panel, circuit #1 is on the left, #2 on the right.
NOTE: All field piping, wiring, and procedures must be performed in accordance with ASHRAE,
EPA, and industry standards.
Figure 25, Piping Schematic (Remote Evaporator, Circuit w/ Economizer)
IMM AGSD3-1
41
Field Wiring (Remote Evaporator)
1. The 110V liquid line solenoid valves have to be wired back to the outdoor unit. Install a junction
box adjacent to the evaporator and wire from each valve (two or three depending on model) to it.
All the wiring, in conduit, can then be run from the box back to the unit junction box located on a
unit base cross-frame between the compressors. The connections are made to marked terminals as
shown in Figure 26. Wiring from the unit terminal box to the unit control panel is done in the
factory.
2. The electronic expansion valve has a 40-foot long cable attached and can be used, as is, when the
outdoor unit is less than 40 feet away. Beyond that, a junction box must be located within 40-feet
of the evaporator, and up to 60 additional feet of 14GA wire connected from the cable to the unit,
allowing up to a total distance of 100 feet (40 feet of cable and up to 60 feet of 14GA).
3. Two evaporator water temperature sensors (WOE-outlet nozzle and WIE-inlet nozzle) with 100
feet of cable coiled up and attached to the unit base for extension to the evaporator and insertion in
fittings located on the side of the inlet and outlet nozzles.
4. One suction line refrigerant temperature sensor (ST1/2/3) per circuit with 100 feet of cable coiled
up and attached to the unit base for extension to the evaporator.
5. One suction line pressure transducer per circuit (WL1/2/3) with 100 feet of cable is factorymounted on the outdoor unit’s suction line. Move the transducer to the field-installed suction line,
adjacent to the evaporator, securing the cable as required.
6. A flow switch must be installed in the leaving chilled water line per manufacturer’s instructions
and wired to terminals 1 and 8 on terminal board 6 (TB6) in the chiller control panel. See wiring
diagram on page Figure 22 on page 35.
7. Do not shorten any factory supplied wiring.
Figure 26, Remote Evaporator Field Wiring
DETAIL VIEW OF
MCQUAY JUNCTION BOX
R1
R1
R2
R2
W1
W
FIELD SUPPLIED
R3
L1
W2
W3
SOLENOID
L1
MCQUAY
JUNCTION BOX
(ON BASE RAIL)
R
W
R
W
FIELD
JUNCTION BOX
R1 W1
R
L2
R2
W
L2
SOLENOID
W2
L3
R3 W3
FIELD SUPPLIED
R1
W1
L3
SOLENOID
R2
DETAIL VIEW OF
FIELD JUNCTION BOX
R1
R2
W2
R3
R3
LEGEND
3 CIRCUIT UNITS ONLY
W3
W
WIRE NUTS
R
RED 14GA WIRE (MIN.)
W
WHITE 14GA WIRE (MIN.)
331687601 REV.00
42
IMM AGSD3-1
Kit Components
The kit shipped with the unit has the following components for field installation:
Filter-drier and cores
Sight glass
Charging Valve
Electronic expansion valve
Solenoid valve
Evaporator vent and drain plugs
Filter-drier cores for economizer piping
Refrigerant Line Sizing
Layout and size the refrigerant piping in accordance with the latest edition of the ASHRAE Handbook.
A line sizing guide can be found below. Each of the two suction line’s velocity must be sufficient to
carry oil when considering a capacity reduction of 25% in each circuit.
!
IMPORTANT NOTE
!
Service Form SF99006 and an isometric sketch of the Remote Piping Layout showing pipe size, location of
fittings, measured lengths, and elevations MUST BE SUBMITTED TO McQuay Technical Response Center
and reviewed at least two weeks prior to beginning piping installation. McQuay Factory Service will not
perform startup without reviewed Service Form SF99006 and drawing. Installation must match reviewed
drawing. All field piping, wiring and procedures must comply with design guidelines set forth in the Remote
Evaporator section of product literature, and be performed in accordance with ASHRAE, EPA, local codes
and industry standards. Any product failure caused or contributed to by failure to comply with appropriate
design guidelines will not be covered by manufacturer’s warranty. McQuay Technical Response: Fax: 763509-7666; Phone : 540-248-9201; E-mail: techresponse@mcquay.com
NOTE: The following applies to all size units:
• Do not run refrigerant piping underground.
• Maximum linear line length can not exceed 75 feet.
• Maximum total equivalent length (TEL) can not exceed 180 feet (100 ft. for vertical suction lines)
• The evaporator can not be located more than 15 feet above the outdoor unit.
• The evaporator can not be located more than 20 feet below the outdoor unit.
• Suction line connection at unit = 3 5/8 inches.
• Suction line connection at evaporator = 4 1/8 inches.
• Liquid line connection at the unit = 1 3/8.
• Liquid line connection at the evaporator = 1 5/8.
• When facing the unit control box, the left-hand compressor is circuit # 1, and the right-hand is
compressor # 2. With mix-matched compressor sizes, #1 is the smallest.
• The liquid line can be subcooled below ambient temperature and must be insulated to prevent loss
of subcooling and consequent liquid refrigerant flashing and capacity loss or possible
condensation depending on ambient conditions.
• Field piping must include adequate service taps for checking filter-drier, subcooling, and superheat.
Table 28, Fitting Equivalent Feet of Pipe
Line Size
In. OD
2 5/8
3 1/8
3 5/8
4 1/8
Angle Valve
Globe Valve
Ball Valve
29.00
35.0
41.0
47.0
69.0
84.0
100.0
120.0
1.0
1.0
1.0
1.0
90 Degree Std.
Radius Elbow
6.0
7.5
9.0
10.0
90 Degree Long
Radius Elbow
4.1
5.0
5.9
6.7
NOTE: TEL values for the filter-drier and solenoid valve are already included] and should not be added to the
liquid line drop.
IMM AGSD3-1
43
Table 29, Recommended Horizontal or Downflow Suction Line Size
AGS
Model
140
160
170 to 210
Circuit
Both
#1
#2
Both
Up to 50
Equiv. Ft.
Size
PD
3 5/8
0.71
3 5/8
0.71
3 5/8
1.00
3 5/8
1.00
Up to 75
Equiv. Ft.
Size
PD
3 5/8
1.06
3 5/8
1.06
3 5/8
1.51
3 5/8
1.51
Up to 100
Equiv. Ft.
Size
Size
3 5/8
1.42
3 5/8
1.42
3 5/8
2.01
3 5/8
2.01
Up to 125
Equiv. Ft.
Size
PD
3 5/8
1.77
3 5/8
1.77
4 1/8
1.36
4 1/8
1.36
Up to 150
Equiv. Ft.
Size
PD
3 5/8
2.12
3 5/8
2.12
4 1/8
1.63
4 1/8
1.63
Up to 180
Equiv. Ft.
Size
PD
3 5/8
2.54
3 5/8
2.54
4 1/8
1.95
4 1/8
1.95
NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop
can be interpolated by feet.
Table 30, Recommended Upflow Suction line Size
AGS
Model
140
160
170 to 210
Circuit
Both
#1
#2
Both
Up to 50
Equiv. Ft.
Size
PD
Up to 75
Equiv. Ft.
Size
PD
Up to 100
Equiv. Ft.
Size
PD
3 1/8
3 1/8
3 5/8
3 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 1/8
3 1/8
3 5/8
3 5/8
0.71
0.71
1.00
1.00
1.06
1.06
1.51
1.51
1.42
1.42
2.01
2.01
NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop
can be interpolated by feet.
Table 31, Recommended Liquid line Size.
AGS
Model
140
160
170 to 210
Circuit
Both
#1
#2
Both
Up to 50
Equiv. Ft.
Size
PD
Up to 75
Equiv. Ft.
Size
PD
Up to 100
Equiv. Ft.
Size
Size
Up to 125
Equiv. Ft.
Size
PD
Up to 150
Equiv. Ft.
Size
PD
Up to 180
Equiv. Ft.
Size
PD
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
0.92
0.92
1.30
1.30
1.37
1.37
1.95
1.95
1.83
1.83
2.6
2.6
2.29
2.29
3.25
3.25
2.75
2.75
3.90
3.90
3.30
3.30
4.68
4.68
NOTE: “Size” is tubing size in inches, “PD” is the pressure drop in equivalent degrees F. The line pressure drop
can be interpolated by feet.
44
IMM AGSD3-1
Dimensions & Weights, Remote Evaporator
Standard Efficiency
Figure 27, Dimensions, AGS 140DM – 170DM (Remote Evaporator)
M2 L2
M4
L4
M6
88.0
86.0 NOTE 2.
NOTES:
1.
2.
3.625 SUCTION
CONNECTIONS
COMP
CIRC #1
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
66.3
49.4
COMP
CIRC #2
38.6
1.375 LIQUID
CONNECTIONS
21.7
M5
203.6
229.2
L3
173.4
78.8
40.5
25.6
0
.750
QTY.6
NOTE 1.
M3
80.0
2.0
0
M1 L1
100.1
95.0
CONTROL
PANEL
.875
FIELD CONTROL
CONNECTIONS
COG
.875
POWER
KNOCKOUTS
Z
COG
38.8
32.5
Y
17.1
4.2
0
X
88.0
60.3
64.3
68.3
0
0
3.2
6.2
9.2
0
AGS140-170DM - REMOTE EVAP 10 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE
*331717802001*
NONE
Table 32, AGS140-170DM, Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
140-170DM
140-170DM
Aluminum
Copper
IMM AGSD3-1
Lifting Weights
Mounting Weights
L1, L2 L3, L4 M1, M2 M3, M4 M5, M6
Operating
Weight
Shipping
Weight
COG Dimensions
X
Y
Z
lbs
lbs
lbs
lbs
lbs
lbs
lbs
(in.)
(in.)
(in.)
3235
3591
1362
1982
2156
2371
1785
2078
944
1411
9770
11720
9195
11145
79.88
87.76
42.01
45.87
44
44
45
NOTE 2.
Figure 28, AGS 190DM & 210DM (Remote Evaporator)
M2 L2
M4
L4
M6
88.0
86.0 NOTE 2.
38.6
COMP
CIRC #2
1.375 LIQUID
CONNECTIONS
100.1
95.0
L3
M5
217.7
2.0 NOTE 2.
0
267.4
M3
193.5
78.8
0
M1 L1
21.7
80.0
.750
QTY.6
NOTE 1.
40.5
CONTROL
PANEL
.875
FIELD
CONTROL
KNOCKOUTS
COG
.875
POWER
KNOCKOUTS
Z
COG
38.8
32.4
Y
17.1
X
88.0
60.3
64.3
68.3
0
0
3.2
6.2
9.2
0
4.2
0
2.
66.3
49.4
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
25.6
1.
3.625 SUCTION
CONNECTIONS
COMP
CIRC #1
NOTES:
AGS190,210DM/AGS140-170DF - REMOTE EVAP - 12 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE NONE
*331717804001*
Table 33, AGS190-210DM, Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
Lifting Weights
Mounting Weights
L1, L2 L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
lbs
Operating
Weight
Shipping
Weight
lbs
lbs
COG Dimensions
X
Y
Z
(in.)
(in.)
(in.)
190-210DM
Aluminum
3276
1694
2082
1861
1304
10495
9940
92.65
43.61
44
190-210DM
Copper
3641
2399
2280
2166
1878
12650
12080
101.28
47.24
44
46
IMM AGSD3-1
High Efficiency
Figure 29, Dimensions, AGS 140DF – 170DF (Remote Evaporator)
M2 L2
M4
L4
M6
88.0
86.0 NOTE 2.
38.6
COMP
CIRC #2
1.375 LIQUID
CONNECTIONS
100.1
95.0
.875
FIELD
CONTROL
KNOCKOUTS
L3
M5
217.7
2.0 NOTE 2.
0
267.4
M3
193.5
78.8
0
M1 L1
21.7
80.0
.750
QTY.6
NOTE 1.
40.5
CONTROL
PANEL
.875
POWER
KNOCKOUTS
Z
COG
COG
38.8
32.4
Y
17.1
X
88.0
60.3
64.3
68.3
0
0
3.2
6.2
9.2
0
4.2
0
2.
66.3
49.4
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
25.6
1.
3.625 SUCTION
CONNECTIONS
COMP
CIRC #1
NOTES:
AGS190,210DM/AGS140-170DF - REMOTE EVAP - 12 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE NONE
*331717804001*
Table 34, AGS140-170DF, Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
Lifting Weights
Mounting Weights
L1, L2 L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
lbs
Operating
Weight
Shipping
Weight
lbs
lbs
COG Dimensions
X
Y
Z
(in.)
(in.)
(in.)
140-170DF
Aluminum
3276
1694
2082
1861
1304
10495
9940
92.65
43.61
44
140-170DF
Copper
3641
2399
2280
2166
1878
12650
12080
101.28
47.24
44
IMM AGSD3-1
47
Figure 30, Dimensions, AGS 190DF (Remote Evaporator)
M2 L2
M4
L4
M6
88.0
86.0 NOTE 2.
COMP
CIRC #1
3.625 SUCTION
CONNECTIONS
COMP
CIRC #2
1.375 LIQUID
CONNECTIONS
66.3
NOTES:
M5
11.7
2.0 NOTE 2.
0
263.2
267.4
L3
217.7
78.8
80.0
38.6
193.5
M3
40.5
25.6
0
M1 L1
150.6
.750
QTY.6
NOTE 1.
100.1
95.0
CONTROL
PANEL
.875
FIELD
CONTROL
KNOCKOUTS
.875
POWER
KNOCKOUTS
Z
COG
COG
38.8
32.5
Y
17.1
13.2
0
0
X
88.0
60.3
64.3
68.3
2.
49.4
ISOLATOR MOUNTING HOLE LOCATIONS
ON BOTTOM SURFACE OF UNIT BASE.
CENTER OF ISOLATOR MOUNTING HOLE LOCATED
2.0IN FROM OUTSIDE EDGE OF UNIT BASE.
0
3.2
6.2
9.2
1.
AGS190DF - REMOTE EVAP - 12 FAN
ALL DIMENSIONS ARE IN DECIMAL INCHES
SCALE NONE
*331717805001*
Table 35, AGS190DF, Shipping & Operating Weight, Center of Gravity Dimensions
AGS Model
Fin Type
Lifting Weights
Mounting Weights
L1, L2 L3, L4 M1, M2 M3, M4 M5, M6
lbs
lbs
lbs
lbs
lbs
Operating
Weight
Shipping
Weight
lbs
lbs
COG Dimensions
X
Y
Z
(in.)
(in.)
(in.)
190DF
Aluminum
3276
1694
2082
1861
1304
10495
9940
92.65
43.61
44
190DF
Copper
3641
2399
2280
2166
1878
12650
12080
101.28
47.24
44
48
IMM AGSD3-1
Remote Evaporators
Figure 31, Remote Evaporator Dimensions
NOTES:
1.
2.
3.
4.
5.
Liquid line connection is 1 5/8-inch IDS flange.
All dimensions are in inches (mm).
Insulated with ¾-inch Armaflex or equal UL approved insulation.
Tube side (refrigerant) maximum working pressure: 350 psig @ 175°F.
Shell side (water) maximum working pressure: 152 psig.
AGS MODEL
COND.
MODEL
NUMBER
DIMENSIONAL DATA, inches (mm)
'A'
'B'
'C'
'D'
'E'
'F'
'G'
'H'
I.D.S.
'J'
'K'
'L'
'M'
'N'
DIA.
140DM to 170DM
140DF to 170DF
330904451
20.3
(515)
11.0
(280)
16.0
(406)
13.2
(334)
90.2
(2292)
17.8 121.2
(452) (3078)
4 1/8
(105)
9.2
103.9 114.9 108.3 18.5
(234) (2640) (2918) (2750) (470)
190DM to 210DM
190DF
330904452
20.3
(515)
11.0
(280)
16.0
(406)
13.2
(334)
90.2
(2292)
17.8 121.2
(452) (3078)
4 1/8
(105)
9.2
103.9 114.9 108.3 18.5
(234) (2640) (2918) (2750) (470)
IMM AGSD3-1
49
Physical Data
Standard Efficiency, Remote Evaporator
Table 36, Standard Efficiency, AGS 140DM – AGS 210DM (Remote Evaporator)
DATA
140DM
Ckt 1
160DM
Ckt 2
Ckt 1
170DM
Ckt 2
BASIC DATA
Unit Cap. @ ARI tons (kW)
137.0 (481.4)
155.2 (545.4)
Unit Operating Charge lbs (kg)
167 (76)
167 (76)
167 (76)
167 (76)
Cabinet Dimensions
229.2x88x100.1
229.2x88x100.1
L x WOperating
x H, in. (mm)
(5821x2235x2542)
(5821x2235x2542)
Unit
Weight, lbs. (kg)
9770
9770
Unit Shipping Weight, lbs (kg)
9195
9195
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
70 (246)
70 (246)
70 (246)
85 (299)
Minimum Capacity (% of Full Load)
15
15
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER
Pumpdown Capacity, lbs (kg)
399 (181)
399 (181)
399 (181)
399 (181)
Coil Inlet Face Area, sq. ft. (sq m.)
131.8 (12.2)
131.8 (12.2)
131.8 (12.2)
131.8 (12.2)
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan Dia.
5
5
6
6
Fan Motor hp (kW)
2.0 (1.5)
2.0 (1.5)
Fan & Motor RPM, 60Hz
1140
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
108630 (51280)
108630 (51280)
REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
16x108 (406x2750)
16x108 (406x2750)
Water Volume, gallons (liters)
63.6 (241)
63.6 (241)
Refrigerant Charge, lbs (kg)
2.6 (1.2)
2.6 (1.2)
2.6 (1.2)
2.6 (1.2)
Operating Weight lbs (kg)
1675 (759)
1675 (759)
Shipping weight, lbs (kg)
1330 (605)
1330 (605)
Max. Water Pressure, psi (kPa)
152 (1048)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
350 (2413)
DATA
190DM
Ckt 1
Ckt 1
Ckt 2
(163.7 (575.7)
167 (76)
167 (76)
229.2x88x100.1
(5821x2235x2542)
9770
9195
85 (299)
85 (299)
15
399 (181)
131.8 (12.2)
399 (181)
131.8 (12.2)
6
6
2.0 (1.5)
1140
8950 (45.5)
108630 (51280)
16x108 (406x2750)
63.6 (241)
2.6 (1.2)
2.6 (1.2)
1675 (759)
1330 (605)
152 (1048)
350 (2413)
200DM
Ckt 2
210DM
Ckt 2
BASIC DATA
Unit Cap. @ ARI tons (kW)
176.5 (575.8)
188.9 (664.4)
Unit Operating Charge lbs (kg)
187 (85)
197 (90)
197 (90)
197 (90))
Cabinet Dimensions
267.4x88x100.1
267.4x88x100.1
L x WOperating
x H, in. (mm)
(6792x2235x2542)
(6792x2235x2542)
Unit
Weight, lbs. (kg)
10495
10495
Unit Shipping Weight, lbs (kg)
9940
9940
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
85 (299)
100 (352)
100 (352)
100 (352)
Minimum Capacity (% of Full Load)
15
15
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER
Pumpdown Capacity, lbs (kg)
438 (199)
438 (199)
438 (199)
438 (199)
Coil Inlet Face Area, sq. ft. (sq m.)
158.3 (14.7)
158.3 (14.7)
158.3 (14.7)
158.3 (14.7)
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan Dia.
6
6
6
6
Fan Motor hp (kW)
2.0 (1.5)
2.0 (1.5)
Fan & Motor RPM, 60Hz
1140
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
130360 (61530)
130360 (61530)
REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
16x108 (406x2750)
16x108 (406x2750)
Water Volume, gallons (liters)
63.6 (241)
63.6 (241)
Refrigerant Charge, lbs (kg)
2.6 (1.2)
2.6 (1.2)
2.6 (1.2)
2.6 (1.2)
Operating Weight lbs (kg)
1675 (759)
1675 (759)
Shipping weight, lbs (kg)
1330 (605)
1330 (605)
Max. Water Pressure, psi (kPa)
152 (1048)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
350 (2413)
50
Ckt 1
Ckt 1
Ckt 2
201.1 (707.4)
197 (90)
197 (90)
267.4x88x100.1
(6792x2235x2542)
10495
9940
105 (370)
105 (370)
15
438 (199)
158.3 (14.7)
438 (199)
158.3 (14.7)
6
6
2.5 (1.9)
1140
8950 (45.5)
137328 (64819)
16x108 (406x2750)
63.6 (241)
2.6 (1.2)
2.6 (1.2)
1675 (759)
1330 (605)
152 (1048)
350 (2413)
IMM AGSD3-1
High Efficiency, Remote Evaporator
Table 37, High Efficiency, AGS 1470DF – AGS 190DF (Remote Evaporator)
DATA
140DF
Ckt 1
170DF
Ckt 2
Ckt 1
190DF
Ckt 2
BASIC DATA
Unit Cap. @ ARI tons (kW)
Unit Operating Charge lbs (kg)
Cabinet Dimensions
L x W x H, in. (mm)
Unit Operating Weight, lbs. (kg)
Unit Shipping Weight, lbs (kg)
145.6 (512)
166.9 (587)
177 (81)
177 (81)
177 (81)
177 (81)
267.4x88x100.1
267.4x88x100.1
(6792x2235x2542)
(6792x2235x2542)
10495
10495
9940
9940
COMPRESSORS, SCREW, SEMI-HERMETIC
Nominal Capacity, tons (kW)
70 (246)
85 (299)
70 (246)
85 (299)
Minimum Capacity (% of Full Load)
15
15
CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER
Pumpdown Capacity, lbs (kg)
438 (199)
438 (199)
438 (199)
438 (199)
Coil Inlet Face Area, sq. ft. (sq m.)
158.3 (14.7)
158.3 (14.7)
CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE
No. of Fans/Circuit – 30 in. Fan
6
6
Dia.
Fan Motor hp (kW)
2.0 (1.5)
Fan & Motor RPM, 60Hz
1140
60 Hz Fan Tip Speed, fpm (m/s)
8950 (45.5)
60 Hz Total Unit Airflow, cfm (l/s)
130360 (61530)
REMOTE EVAPORATOR, DIRECT EXPANSION SHELL AND TUBE
Shell Dia.-Tube Length, in.(mm)
16x108 (406x2750)
Water Volume, gallons (liters)
63.6 (241)
Refrigerant Charge, lbs (kg)
2.6 (1.2)
2.6 (1.2)
Operating Weight lbs (kg)
1675 (759)
Shipping weight, lbs (kg)
1330 (605)
Max. Water Pressure, psi (kPa)
152 (1048)
Max. Refrigerant Press., psi (kPa)
350 (2413)
IMM AGSD3-1
Ckt 1
Ckt 2
180.6 (635.2)
207 (94)
207 (94)
267.4x88x100.1
(6792x2235x2542)
10495
9940
85 (299)
85 (299)
15
438 (199)
158.3 (14.7)
158.3 (14.7)
158.3 (14.7)
6
6
6
438 (199)
158.3
(14.7)
6
2.0 (1.5)
1140
8950 (45.5)
130360 (61530)
2.0 (1.5)
1140
8950 (45.5)
130360 (61530)
16x108 (406x2750)
63.6 (241)
2.6 (1.2)
2.6 (1.2)
1675 (759)
1330 (605)
152 (1048)
350 (2413)
16x108 (406x2750)
63.6 (241)
2.6 (1.2)
2.6 (1.2)
1675 (759)
1330 (605)
152 (1048)
350 (2413)
51
Vibration Isolators, Remote Evaporator
Vibration isolators are recommended for all roof-mounted installations or wherever vibration
transmission is a consideration. Isolator loads for all unit sizes begin on page 45. Isolators are also
recommended for slab installations, primarily to keep the unit base from resting its entire length
directly on the slab. Isolator dimensions are on page 14.
Isolator Installation
The unit should be initially installed on shims or blocks at the listed free height. When all piping,
wiring, flushing, charging, etc. is completed, adjust the springs upward to load them and to provide
clearance to remove the shims or blocks.
Installation of spring isolators requires flexible piping connections and at least three feet of conduit
flex tie-ins. Piping and conduit must be supported independently of the unit.
Rubber-in-Shear (Remote Evaporator)
Table 38, Standard Efficiency with Aluminum Fin Condensers
R-I-S MOUNTING LOCATIONS
UNIT
SIZE
1
2
3
4
5
6
140DM to
170DM
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Brown
RP-4
Brown
332325403
190DM to
210DM
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Brick Red
RP-4
Brick Red
332325401
R-I-S KIT
NUMBER
Table 39, High Efficiency with Aluminum Fin Condensers
UNIT
SIZE
140DF to
210DF
R-I-S MOUNTING LOCATIONS
1
2
3
4
5
6
RP-4
RP-4
RP-4
RP-4
RP-4
RP-4
Lime
Lime
Lime
Lime
Brick Red
Brick Red
R-I-S KIT
NUMBER
332325401
Table 40, Standard Efficiency with Copper Fin Condensers
UNIT
SIZE
R-I-S MOUNTINGS
1
2
3
4
5
6
R-I-S KIT
NUMBER
140DM to
170DM
RP-4
RP-4
RP-4
RP-4
RP-4
RP-4
332325401
Lime
Lime
Lime
Lime
Brick Red
Brick Red
190DM to
210DM
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
332325402
Table 41, High Efficiency with Copper Fin Condensers
R-I-S MOUNTINGS
UNIT
SIZE
1
2
3
4
5
6
140DF to
190DF
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
RP-4
Lime
52
R-I-S KIT
NUMBER
332325402
IMM AGSD3-1
Spring-Flex (Remote Evaporator)
Table 42, Standard Efficiency with Aluminum Fin Condensers
SPRING-FLEX MOUNTINGS
UNIT
SIZE
140DM to
170DM
1
4
White
Gray
Gray
White
White
KIT
NUMBER
C2PE-1D1800
332320401
Dark Green Dark Green
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2720
2720
2400
White
6
5
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2400
2400
1800
White
190DM to
210DM
3
2
White
Gray
C2PE-1D2400
332320402
Gray
Table 43, High Efficiency with Aluminum Fin Condensers
SPRING-FLEX MOUNTINGS
UNIT
SIZE
140DF to
190DF
1
2
3
4
5
6
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2720
2720
2400
2400
White
White
White
White
Gray
KIT
NUMBER
332320402
Gray
Table 44, Standard Efficiency with Copper Fin Condensers
SPRING-FLEX MOUNTINGS
UNIT
SIZE
140 DM to
170DM
1
3
4
5
6
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2720
2720
2400
2400
White
190DM to
210DM
2
White
White
White
Gray
White
White
White
White
332320402
Gray
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2720
2720
2720
2720
White
KIT
NUMBER
332320403
White
Table 45, High Efficiency with Copper Fin Condensers
SPRING-FLEX MOUNTINGS
UNIT
SIZE
140DF to
190DF
1
2
3
4
5
6
C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D- C2PE-1D2720
2720
2720
2720
2720
2720
White
IMM AGSD3-1
White
White
White
White
KIT
NUMBER
332320403
White
53
Solid State Starters
Solid state starters are standard on all AGS units. A solid state starter uses a silicon-controlled
rectifier (SCR) power section to allow a motor to be brought to full speed with a reduced initial
voltage that increases to full line voltage over a given time. The McQuay motor starter, custom
designed for this specific application, is microprocessor controlled. Along with this starting
technique, the motor starter also provides protection for the motor and monitors its load conditions.
The starter offers:
•
Solid state design.
•
Closed-loop motor current control.
•
Programmable motor protection.
•
Programmable operating parameters.
•
Programmable metering options.
The three-phase starter contains a six-SCR power section with two SCRs per phase connected in
inverse parallel. This power section is capable of providing maximum torque per amp throughout
the motor’s speed-torque curve with minimal motor and starter heating. At the same time, the starter
continually monitors the amount of current being delivered to the motor, thus helping to protect the
motor from overheating or drawing excessive current. The starter will automatically stop the motor
if the line-to-line current is not within acceptable ranges, or if the current is lost in a line. The motor
current scaling is set according to the motor size and the specific application. The starter circuitry is
contained on a single printed circuit board, which contains all the logic and SCR gate drive circuitry.
Operating messages are displayed on a three-character LED display located in the unit control panel.
The LED display on the control card displays:
•
Operating messages that indicate the status of the motor and/or starter.
•
Operating parameters that are programmed into the starter.
•
Fault codes that indicate a problem with the motor application or starter.
Operating Messages
Possible operating messages are as follows:
54
Message
noL
Meaning
Line voltage is not present.
rdy
Line voltage is present and starter is ready.
acc
Motor is accelerating after a start command has been received.
uts
The motor has achieved full speed.
run
Motor is operating at full speed, and ramp time has expired.
dCL
A Stop command was received and the motor is decelerating with the set deceleration
profile.
OL
OL will alternately blink with the normal display on the LED display when motor thermal
overload content has reached 90% to 99% of its capacity.
IMM AGSD3-1
OLL
The motor thermal overload content has reached 100%, and the motor has stopped. The
motor cannot be restarted until the overloaded motor has cooled and OLt is displayed.
OLt
The motor thermal overload content has been reduced to 60% or less, and the motor can
be restarted.
ena
Passcode protection is enabled.
dis
Passcode is disabled.
oxx
xx = overload thermal content in percentage. Press the Down button to toggle to this
display.
cxx
xx = pending fault.
no
Attempted to change a passcode protected parameter without proper security.
…
Three decimal places blink when remote display is active.
Fxx
xx Fault Code
Table 46, Fault Codes
Number
Description
Controlled
Stop
Auto
Reset
00
No Fault
--
--
01
UTS Time Limit Expired
Y
Y
02
Motor Thermal Overload Trip
Y
N
10
Phase Rotation Error, Not A-B-C
N
Y
12
Low Line Frequency
N
Y
13
High Line Frequency
N
Y
15
Input Power Not Three phase
N
Y
21
Low Line L1-L2 Voltage
Y
Y
22
Low Line L2-L3 Voltage
Y
Y
23
Low Line L3-L1 Voltage
Y
Y
24
High Line L1-L2 Voltage
Y
Y
25
High Line L2-L3 Voltage
Y
Y
26
High Line L3-L1 Voltage
Y
Y
27
Phase loss
N
Y
28
No Line Voltage
N
Y
30
I.O.C. (Instantaneous Overcurrent)
N
N
31
Overcurrent
Y
N
37
Current Imbalance
Y
Y
38
Ground Fault
Y
N
39
No Current At Run
N
Y
40
Shorted/Open SCR
N
N
47
Stack Protection Fault
N
Y
48
Bypass Contactor Fault (on STOP input)
Y
N
50
Control Power Low
N
Y
Continued next page
IMM AGSD3-1
55
Number
Description
Controlled
Stop
Auto
Reset
51
Current Sensor Offset Error
--
N
52
Burden Switch Error
N
N
60
Thermistor Trip
N
N
61
Stack OT Switch Trip
N
N
71
Analog Input Trip
Y
Y
82
Modbus Time-out
Y
Y
94
CPU Error – Software Fault
N
N
95
CPU Error – Parameter Storage Fault
N
N
96
CPU Error – Illegal Instruction Trap
N
N
97
CPU Error – Software Watchdog Fault
N
N
98
CPU Error – Spurious Interrupt N
N
N
99
CPU Error – Program Storage Fault
N
N
Starter Planned Maintenance
During commissioning:
• Torque all power connections during commissioning. This includes factory-wired components.
• Check all of the control wiring in the package for loose connections.
During the first month after the starter has been put in operation:
• Re-torque all power connections every two weeks. This includes factory-wired components.
• Inspect cooling fans (if applicable) after two weeks for proper operation.
After the first month of operation:
• Re-torque all power connections every year.
• Clean any accumulated dust from the starter using a clean source of compressed air.
• Inspect the cooling fans every three months for proper operation.
• Clean or replace any air vent filters on the starter every three months.
NOTE: If mechanical vibrations are present at the installation site, inspect the connections more
frequently.
56
IMM AGSD3-1
Figure 32, Trouble Shooting Guide
Start
3
Yes
Low or Missing
Line?
No
4
1
No
Fuses OK?
Yes
Replace
Fuses
No
Yes
Phase Order
Fault
No
2
Circuit
Breaker OK?
5
Swap Any
2 Power
Leads
Yes
Thermal Trip?
Yes
No
6
Replace
Circuit
Breaker
Yes
No
In-Line OK?
Interlock
Open?
No
Yes
7
Correct
Inline Fault
Correct Power
Source
Problem
8
No
No
High
Ambient?
Wiring OK?
Yes
Yes
9
Replace
Control Card
Correct and
Wait to Cool
Yes
Bad Air
Circulation?
No
Correct
Interlock
State
No
Return To
Service
Does Problem
Still Exist
No
10
Motor
Overloaded?
Yes
Yes
7
Correct
Wiring
Go to Page 39
No
Wiring OK?
Lower Motor
Load
Yes
Correct
Wiring
Correct and
Wait to Cool
Return To
Service
IMM AGSD3-1
57
From Previous Page
11
Current
Imbalance Fault?
No
Yes
7
No
Fuses Blown or
Breaker Tripped?
Wiring Good?
Yes
Yes
12
Motor
Winding Short?
Correct Wiring
No
Yes
Replace Fuse
or Reset Breaker
No
13
No
12
No
SCRs OK?
Motor Problem?
Yes
Replace
Defective SCRs
14
All Gate
Pulses Present?
Yes
15
Yes
CT Burden
Switches Set
Correctly?
Repair or
Replace Motor
No
Replace
Control Card
Return to
Normal
Operation
No
Yes
Contact
Benshaw
For Assistance
Replace
Control Card
No
Check Jumpers
Parameters
and CTs
Does Problem
Still Exist?
Yes
Contact
McQuay
For Assistance
58
IMM AGSD3-1
FLOW CHART DETAILS:
Fuses
Determine if power line fuses have been installed, and if they are
operating properly.
2. Circuit Breaker
Determine if the circuit breaker is off, or has tripped and disconnected
the line from the starter.
3. Power Line Voltage
Verify that line voltage is present, and that it is the correct voltage.
4. Phase Order Fault
If Fault Codes F1 or F2 are displayed on the control card LED display,
exchange any two incoming power line cable connections.
5. Heat Sink Switch
Investigate whether heat sink thermal switch is open.
Determine if an equipment protection device attached to the starter is
6. Safety Device
disabling the start command.
7. Wiring Connections
Verify that the wiring connections are correct and that the terminations
are tightened.
Investigate whether the air temperature surrounding the heat sink is hot.
8. Air Temperature
9. Air Circulation
Determine if the airflow around the heat sink fins is being restricted, or
if a fan has failed.
10. Motor Overload
Determine if the motor’s load is too large for the motor size.
11. Current Imbalance Fault If Fault Codes F23 or F24 are displayed on the control card LED
display, diagnose and correct the cause of the current imbalance
parameter P16.
12. Motor Winding Problem Conducting a megger test of the motor can identify an internal motor
winding problem. NOTE: To avoid damaging the starter isolate the
motor before conducting the megger test.
1.
!
WARNING
Hazardous voltages exist at the starter terminals. Lock out and tag all power sources before
making resistance measurements to avoid personal injury or death.
13. SCRs
14. Gate Pulses
15. Motor Current
IMM AGSD3-1
This step can help determine if a problem exists with the SCRs. Using a
multi-meter or similar device, measure the resistance between:
• L1 terminal and T1 terminal
• L2 terminal and T2 terminal
• L3 terminal and T3 terminal
The resistance should be more than 50k ohms. Measure the gate
resistance between the white and red of each twisted pair (6 total). The
gate resistance should be between 8 and 50 ohms.
This step can help to determine if the control card is functioning
properly. Check for gate firing voltage between 0.3 and 1.5 volts when
the card is operating.
Determine if motor current signal scaling is correct.
59
Solid State Starter Settings
Operating Parameters Settings for Default Value and Settable Range:
Table 47, Starter Settings
No.
Operating Parameter
Default
Range of Setting
P1
Motor Full Load Amps (FLA)
1A
1 to 9999A
P2
Motor Rated Load Amps (RLA)
1A
1 to 9999A
P3
Motor Service Factor
1.25
1-1.99
P4
Motor Overload Class
10
1-40,Off
P5
Initial Motor Starting Current
225%
50 - 400%
P6
Max. Motor Starting Current
300%
100 – 800%
P7
Motor Ramp Time
7 sec
0 - 300 sec
P8
UTS time
10 sec
1 - 900 sec
P9
Stop Mode
Cos
Coast/Voltage decel
P10
Deceleration Level 1
40%
0 – 100%
P11
Deceleration Level 2
20%
0 – 50%
P12
Deceleration Time
2 sec
1 – 180 sec
P13
Default Meter Display
0(Status)
0-19
P14
Overcurrent Trip Level
140%
Off, 50 to 800%RLA
P15
Overcurrent Trip Time
2 sec
P16
Rated RMS Voltage
460
P17
Overvoltage Trip Level
10%
Off, .1 – 90 sec
100,110,120,200,208,220,230,24
0,350,380,400,415,440,460,480,
500,525,575,600,660,690,1000
Off, 1 – 40% rated volts
P18
Undervoltage Trip Level
10%
Off, 1 – 40% rated volts
P19
Over/Under Voltage Delay Time
1 Sec
.1-90 Sec
P20
Current Imbalance Trip Level
40%
5 - 40%
P21
Controlled Fault Stop
Off
Off, On
P22
Auto Fault Reset Delay Time
60
P23
CT Ratio
2640
P24
Control Source
Ter
Off, 1 – 120 sec
72,96,144,288,864,2640,2880,57
60,8000,14400,28800
Terminal/Network
P25
Modbus Address
2
1 - 247
P26
Modbus Baud Rate
19.2 Kbps
1.2,2.4,4.8,9.6,19.2 kbps
P27
Modbus Timeout
1 sec
Off, 1 – 120 sec
P28
Analog Output Function
1
1 - 11
P29
Analog Output Span
100%
1 – 125%
P30
Analog Output Offset
0%
0 – 99%
P31
Passcode
0-9999
P32
Fault Log
Display faults
60
IMM AGSD3-1
Component Location
Major Component Location
Figure 33, Unit Cutaway View
Power Panel
Control Panel
Suction Connection for
Remote Evaporators (2)
Chilled Water Inlet
Two-circuit DX Evaporator
Filter-drier (2)
Electronic
Expansion
Valve (2)
IMM AGSD3-1
Chilled Water Outlet
Liquid Connection for Remote
61
Figure 34, Piping Schematic, One of Two Circuits
DISCHARGE
TRANSDUCER
(WH1, WH2)
SCHRADER
VALVE
(HEADER)
AIR
FLOW
SCHRADER
VALVE
DISCHARGE
TUBING
DISCHARGE
TEMP. SENSOR
(WD1, WD2)
SUCTION
SHUT-OFF
VALVE
(OPTIONAL)
FRAME 3200
COMPRESSOR
CHARGING
VALVE
SCHRADER
VALVE
AIR
FLOW
AIR
FLOW
OUTSIDE AIR
TEMPERATURE
(WAA)
SUCTION
TRANSDUCER
(WL1, WL2)
RELIEF
VALVE
CONDENSOR
ASSEMBLY
SUCTION
TEMP. SENSOR
(ST1, ST2)
ECONOMIZER FLASH GAS TO COMPRESSOR INTERSTAGE SUCTION
TUBING
LIQUID
TUBING
SCHRADER
VALVE
RELIEF
VALVE
CHARGING
VALVE
SOLENOID
VALVE
THERMAL
EXPANSION
VALVE
WATER OUT
SCHRADER
VALVE
LIQUID
SHUT-OFF
VALVE
WATER IN
(WOE TEMP.
SENSOR)
(WIE TEMP.
SENSOR)
FLOW
SCHRADER
VALVE
ECONOMIZER
FILTER
DRIER
SCHRADER
VALVE
DX EVAPORATOR
SOLENOID SIGHT
GLASS
VALVE
EXPANSION
VALVE
The above diagram illustrates one of the two circuits of an AGS chiller. The evaporator has two single-pass
circuits with water passing over baffles on the shell side.
The vertical and slanted coils on one side of the unit comprise a condensing circuit. Models may have
none, one, or two external economizer circuits consisting of a brazed-plate heat exchanger and expansion
valve (not shown on the above diagram).
Figure 35, Compressor-mounted Components
Mechanical High
Pressure Cutout Switch
Oil Heater
62
Compressor Relief Valve
Optical Oil Level Sensor
IMM AGSD3-1
Power Panel
The power panel is located on the front of the unit, to the right of the control panel.
Figure 36, Power Panel Components (Optional Single Point Power)
Contol
Transformer
and fuses
Breaker,
Circuit #1
Starter,
Circuit #1
Starter,
Circuit #3
Unit
Disconnect
Switch
Breaker,
Circuit #3
Line
Terminals
Breaker,
Circuit #2
Starter,
Circuit #2
NOTE: A three-compressor unit with standard solid state starters is illustrated. The circuit breaker and
starter #3 are absent on AGSD3 two-compressor models.
IMM AGSD3-1
63
Control Panel
The control panel is located on the front of the unit, to the left of the power panel.
Figure 37, Control Panel Components
MicroTech II
Controller, CP1
Expansion I/O
Controllers
Switch and Fuse
Panel
Location for Optional
115V Outlet
Expansion Valve
Drivers, One Per
Circuit
64
IMM AGSD3-1
System Maintenance
General
On initial start-up and periodically during operation, it will be necessary to perform certain routine
service checks. Among these are checking the liquid line sight glasses, and the compressor oil level sight
glass. In addition, check the MicroTech II controller temperature and pressure readings with gauges and
thermometers to see that the unit has normal condensing and suction pressure and superheat and
subcooling readings. A recommended maintenance schedule is located at the end of this section.
A Periodic Maintenance Log is located at the end of this manual. It is suggested that the log be copied and
a report be completed on a regular basis. The log will serve as a useful tool for a service technician in the
event service is required.
Initial start-up date, vibration readings, compressor megger readings and oil analysis information should
be kept for reference base-line data.
Compressor Maintenance
Since the compressor is semi-hermetic, no yearly compressor maintenance is normally required; however,
vibration is an excellent check for proper mechanical operation. Compressor vibration contributes to a
decrease in unit performance and efficiency and indicates that maintenance is required. It is
recommended that the compressor be checked with a vibration analyzer at, or shortly after, start-up and
again on an annual basis. The load should be maintained as closely as possible to the load of the original
test and only one compressor should be running at a time. The initial vibration analyzer test provides a
benchmark of the compressor and, when performed routinely, can give a warning of impending problems.
Lubrication
No routine lubrication is required on AGS units. The fan motor bearings are permanently lubricated. No
further lubrication is required. Excessive fan motor bearing noise is an indication of a potential bearing
failure.
Figure 38, Compressor Oil Filter
Compressor oil must be ICI RL68HB, McQuay Part Number
735030446 in a 1-gallon container. This is synthetic polyolester oil
with anti-wear additives and is highly hygroscopic. Care must be
taken to minimize exposure of the oil to air when charging oil into
the system.
Oil
Sight
Glass
Oil Filter
Housing
The oil filter resides in the compressor housing as shown
in Figure 38. Units without a suction service shutoff valve
require pumping down the circuit in order to change the filter.
The
top of the oil level should be visible in the sight glass. If the glass is
completely filled with oil at all times, the circuit is overcharged with oil. If only refrigerant is visible in
the glass, the circuit has insufficient oil.
A mechanical oil pressure differential switch is mounted on the unit frame adjacent to each compressor
and will shut down the compressor at a differential pressure greater than 25 psi. The switch has automatic
reset but is locked out by the MicroTech II control, which must be reset through the software. A gauge
can be put across the switch to actually measure the pressure drop. The normal pressure drop is 5 to 6 psi.
Change the filter at 15 psi.
IMM AGSD3-1
65
Electrical Terminals
!
DANGER
Electric equipment can cause electric shock with a risk of severe personal injury or death.
Turn off, lock out and tag all power before continuing with following service. Panels can
have more than one power source..
!
CAUTION
Periodically check electrical terminals for tightness and tighten as required. Always use a
back-up wrench when tightening electrical terminals..
Condensers
The condensers are air-cooled and constructed of 3/8" (9.5mm) OD internally finned copper tubes bonded
in a staggered pattern into louvered aluminum fins. No maintenance is ordinarily required except the
routine removal of dirt and debris from the outside surface of the fins. McQuay recommends the use of
non-caustic, non-acidic, foaming coil cleaners available at most air conditioning supply outlets. Flush the
coil from the inside out.
!
WARNING
Use caution when applying coil cleaners. They can contain potentially harmful chemicals.
Wear breathing apparatus and protective clothing. Thoroughly rinse all surfaces to remove
any cleaner residue. Do not damage the fins during cleaning.
If the service technician has reason to believe that the refrigerant circuit contains noncondensables,
recovery of the noncondensables will be required, strictly following Clean Air Act regulations governing
refrigerant discharge to the atmosphere. The service Schrader valves are located on both vertical coil
headers on both sides of the unit at the control box end of the coil. Access panels are located at the end of
the condenser coil directly behind the control panel. Recover the noncondensables with the unit off, after
shutdown of 15 minutes or longer, to allow air to collect at the top of the coil. Restart and run the unit for
a brief period. If necessary, shut the unit off and repeat the procedure. Follow accepted environmentally
sound practices when removing refrigerant from the unit.
Liquid Line Sight Glass
Observe the refrigerant sight glasses (one per circuit) weekly. A clear glass of liquid indicates that there is
adequate refrigerant charge in the system to provide proper feed through the expansion valve. Bubbling
refrigerant in the liquid line sight glass, during stable run conditions, may indicate that there can be an
electronic expansion valve (EXV) problem since the EXV regulates liquid subcooling. Refrigerant gas
flashing in the sight glass could also indicate an excessive pressure drop in the liquid line, possibly due to
a clogged filter-drier or a restriction elsewhere in the liquid line (see page 21 for maximum allowable
pressure drops).
An element inside the sight glass indicates the moisture condition corresponding to a given element color.
If the sight glass does not indicate a dry condition after about 12 hours of operation, the circuit should be
pumped down and the filter-drier changed. An oil acid test is also recommended.
Do not use the sight glass on the EXV body for refrigerant charging. Its purpose is to view the position of
the valve.
Lead-Lag
A feature on all McQuay AGS air-cooled chillers is a system for alternating the sequence in which the
compressors start to balance the number of starts and run hours. Lead-Lag of the refrigerant circuits is
accomplished automatically through the MicroTech II controller. When in the auto mode, the circuit with
the fewest number of starts will be started first. If all circuits are operating and a stage down in the
number of operating compressors is required, the circuit with the most operating hours will cycle off first.
The operator can override the MicroTech II controller, and manually select the lead circuit as circuit #1 or
#2.
66
IMM AGSD3-1
Preventative Maintenance Schedule
PREVENTATIVE MAINTENANCE SCHEDULE
OPERATION
General
Complete unit log and review (Note 3)
Visually inspect unit for loose or damaged components and
visible leaks
Inspect thermal insulation for integrity
Clean and paint as required
Electrical
Sequence test controls
Check contactors for pitting, replace as required
Check terminals for tightness, tighten as necessary
Clean control panel interior
Clean control box fan filter (Note 7)
Visually inspect components for signs of overheating
Verify compressor and oil heater operation
Megger compressor motor
Refrigeration/Oil
Leak test
Check liquid line sight glasses for clear flow
Check compressor oil sight glass for correct level (oil charge)
Check filter-drier pressure drop (see manual for spec)
Check oil filter pressure drop (Note 6)
Perform compressor vibration test
Perform oil analysis test on compressor oil
Condenser (air-cooled)
Clean condenser coils (Note 4)
Check fan blades for tightness on shaft (Note 5)
Check fans for loose rivets and cracks, check motor brackets
Check coil fins for damage and straighten as necessary
WEEKLY
MONTHLY
(Note 1)
ANNUAL
(Note 2)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Notes:
1. Monthly operations include all weekly operations.
2. Annual (or spring start-up) operations include all weekly and monthly operations.
3. Log readings can be taken daily for a higher level of unit observation.
4. Coil cleaning can be required more frequently in areas with a high level of airborne particles.
5. Be sure fan motors are electrically locked out.
6. Replace the filter if pressure drop exceeds 20 psi.
7. The weekly fan filter cleaning schedule can be modified to meet job conditions.
IMM AGSD3-1
67
Warranty Statement
Limited Warranty
McQuay’s written Limited Product Warranty, along with any extended warranty expressly purchased is the
only warranty. Consult your local McQuay Representative for warranty details. Refer to Form 430285Y. To
find your local McQuay Representative, go to www.mcquay.com.
Service
CAUTION
1. Service on this equipment must be performed by trained, experienced refrigeration personnel
familiar with equipment operation, maintenance, correct servicing procedures, and the safety
hazards inherent in this work. Causes for repeated tripping of equipment protection controls
must be investigated and corrected.
2. Anyone servicing this equipment must comply with EPA requirements regarding refrigerant
reclamation and venting.
DANGER
Disconnect all power before doing any service inside the unit to avoid bodily injury or death.
MULTIPLE POWER SOURCES CAN FEED THE UNIT.
Liquid Line Filter-Driers
Replace the filter-drier cores any time excessive pressure drop is read across the filter-drier and/or when
bubbles occur in the sight glass with normal subcooling. There is one, two-core drier in each circuit.
Models AGS 180 to 210 have economizers that incorporate an additional filter-drier that should also be
checked. The maximum recommended pressure drop across the filter-drier is 7 psi at full load.
The filter-driers should also be changed if the moisture indicating liquid line sight glass indicates excess
moisture in the system, or an oil test indicates the presence of acid.
High acid cores may be used temporarily, but replaced after two day use.
The following is the procedure for changing the filter-drier core:
The standard unit pumpdown is set to stop pumpdown when 20 psig (138 kPa) suction pressure is
reached. To fully pump down a circuit beyond 20 psig (138 kPa) for service purposes, a "Full
Pumpdown" service mode can be activated using the keypad.
With Full Pumpdown = Yes, then the next time the circuit is pumped down, the pumpdown will continue
until the evaporator pressure reaches 15 psig (103 kPa) or 120 seconds have elapsed, whichever occurs
first. Upon completing the pumpdown, the "FullPumpDwn" setpoint is automatically changed back to
"No".
The procedure to perform a full service pumpdown for changing the filter-drier core is as follows:
1. Under the "Alarm Spts", change the "FullPumpDwn" setpoint from "No" to "Yes".
2. Move the circuit switch to the OFF position. The compressor will unload to minimum slide position
and the unit will pump down.
68
IMM AGSD3-1
3. Upon completing the full pumpdown per step 3, the "FullPumpDwn" setpoint is automatically
changed back to "No" which reverts back to standard 20 psig (138 kPa) pumpdown stop pressure.
4. If the pumpdown does not go to 15 psig (103 kPa) on the first attempt, one more attempt can be made
by repeating the above steps. Do not repeat "FullPumpDwn" more than once to avoid excessive screw
temperature rise under this abnormal condition.
5. The circuit is now in the deepest pumpdown that can be achieved by the use of the compressor. Close
the two liquid line shutoff valves upstream of the filter-drier, on the circuit to be serviced plus the
optional suction shutoff valve. Manually open the EXV, then remove the remaining refrigerant from
the evaporator by the use of a refrigerant recovery unit.
6. Loosen the cover bolts, remove the cap and replace the filters.
7. Evacuate and open valves.
Evacuate the lines through the liquid line manual shutoff valve(s) to remove noncondensables that could
have entered during filter replacement. Perform a leak check before returning the unit to operation.
Compressor Slide Valves
The slide valves used for unloading the compressor are hydraulically actuated by pulses from the
load/unload solenoid as controlled by the circuit controller. See OM AGS for details on the operation.
The 3200 compressor used on these McQuay chillers uses a slide position indicator to help determine the
load capacity of the compressor by monitoring the position of the slide valve. A slide position of 0%
would be an indication of minimum capacity while 100% would indicate a maximum capacity. In the
event that the slide position indicator is not reading correctly or a “slide indicator failure” is present, the
indicator will need to be calibrated. The following instructions explain how to properly calibrate the
slide position indicator.
IMPORTANT NOTES
•
•
•
•
The slide indicator power plug should never be removed from the indicator while the
compressor is operating. It is likely that the indicator will be damaged and will require
replacement of the slide position indicator.
Removing the wiring plug from an indicator on a compressor that is not operating but has
power applied, will result in the indicator losing the calibration settings. If a slide indicator
will not calibrate properly, disconnect power from the indicator while the compressor is not
running to erase the calibration settings. Repeat the calibration procedure.
Only attempt the calibration procedure when the slide position offsets (set sensor offsets (3)
screen of the circuit controller) in the MT II controller are not adequate enough to “fine tune”
the calibration of the slide position indicator.
Perform the following procedure for an indicator that is not properly calibrated:
1. Unscrew the calibration button cover located on top of the indicator. Power must be
removed from the slide indicator, the slide indicator power plug removed, and the
calibration button cover removed. Make sure that power is not applied to the
indicator and that the compressor is not running. After removing the cap, Re-apply
the power plug to the slide indicator and restore power.
2. The manager level password must be active in the MT II controller in order to calibrate
the slide position indicator.
3. Check the offset adjustments in the MT II controller. Verify that they are at “0” for both
the minimum and maximum adjustments.
IMM AGSD3-1
69
4. Start the compressor. Make certain that the capacity of the compressor is not being
“overridden” or “limited” by a capacity override at the time of calibration. Some limits
that may affect the normal operation of the unit are as follows:
•
•
•
•
•
•
External Load Limit
Low Evaporator Pressure
High Lift Pressure
Low Discharge Superheat Unload
Maximum LWT Pulldown Rate
High Water Temperature Capacity Limit
5. Place the slide valve in the Manual Mode. The slide can be changed from “auto” to
“manual” mode in the circuit controller, on the set compressor setpoints (2) screen.
6. Set the slide target to 0.00%. This will cause the compressor to begin to unload. The
compressor amperage will decrease and the unload solenoid will be energized (located on
the side of the compressor). The amperage can be monitored through the MT II on the
(view circuit status (3) screen). The 24 volt AC signal that energizes the unload solenoid
can be checked with a volt meter on the terminal board.
7. Press and release the calibration button located under the cover that was removed in step
3. The led should change from a solid green light or green flashing light to a solid red
light. Once the red led starts flashing, slowly begin loading up the compressor by
increasing the manual slide valve target by 20% increments until the compressor reaches
100% capacity. This gradual increase will allow the system to build discharge superheat
so that oil loss is avoided. The amperage can be monitored through the MT II as it was
done in step 6. Make sure that the load solenoid is continually energized (located on the
top of the compressor). The 24 volt AC signal that energizes the load solenoid can be
checked with a volt meter on the terminal board. When at 100% slide target, press the
calibration button again. The led should change from a flashing red light to a solid green
light. The slide position should then read approximately 100% on the view circuit status
(1) screen of the circuit controller.
• Note: If a properly calibrated slide position indicator has a green led that is flashing, it is
an indication that the slide position detected is less than 100%. For instance, the green led
will flash fastest at a 0% slide position. The flashing of the green led will slow as slide
position increases until it reaches 100 % slide position. The green led will then stay on
constantly.
8. When the slide indicator has been properly calibrated, change the slide valve control back
to “auto” mode.
9. It may be necessary to “fine tune” the calibration of the indicator at this time. The offsets
may be adjusted to bring the position readings as close to 0% and 100% as possible. The
offsets can be adjusted from the (set sensor offsets (3) screen of the circuit controller) and
should only be done with the compressor operating since the slide is operated by
discharge and oil/spring pressure.
10. Be sure to shut the compressor down and power the unit down prior to replacing the
calibration button cover. With power off, pull the plug from the slide position indicator
and screw the calibration button cover back on to the indicator. Re-apply the plug and
power up the unit.
70
IMM AGSD3-1
11. A “Slide Indicator Failure”, will prevent the compressor from operating. If this happens,
with the compressor not running, press the calibration button. The red led on the indicator
will begin flashing. Once the red led is flashing, press the button again. This will fool the
compressor into thinking it can operate. Once the compressor is running in a “Normal”
operation mode, repeat the calibration procedure.
12. If the slide position indicator cannot be calibrated, then the indicator must be replaced.
(330591101) is the McQuay part number for the slide position indicator currently used on
Frame 3200 compressors. Avoid using the part number provided as anything more than a
reference. Part numbers can change at any time and without warning. Verify the correct
part number through McQuay parts.
Electronic Expansion Valve (EXV)
The electronic expansion valve is located in each circuit’s liquid line entering the evaporator.
The expansion valve meters the amount of refrigerant entering the evaporator to match the cooling load.
It does this by maintaining constant suction superheat. (Superheat is the difference between the actual
refrigerant temperature of the gas as it leaves the evaporator and the saturation temperature corresponding
to the evaporating pressure.) The EXV logic controls the superheat between 4°F at 0% slide position and
8°F at 100% slide position.
The position of the valve can be viewed at any time by using the MicroTech II controller keypad through
the View Refrigerant menus. There are 6386 steps between closed and full open. There is also a sight
glass on the EXV to observe valve movement and to check if it is open or closed visually.
Evaporator
The evaporator is a two-circuit, direct expansion, shell-and-tube type with water flowing through the shell
and refrigerant flowing in one pass through the tubes. The tubes are internally enhanced to provide
extended heat transfer surface. Normally, no service work is required on the evaporator other than
cleaning the water side in the event of improper water treatment or contamination.
Charging Refrigerant
Note:
It is a good idea to record the normal values of refrigerant pressures, subcooling, superheat, and
evaporator and condenser approach temperatures during startup by the McQuay service technician. This
makes it easier to spot errant unit behavior.
Indications of a low refrigerant R-134a charge:
•
Condenser subcoolong approaching 0 degrees F.
•
Suction superheat higher than 10 to 12 degrees F.
•
Bubbles in the sight glass.
Indications of a high refrigerant R-134a charge:
•
Condenser pressure is abnormally high.
•
Subcooling is abnormally high. Take note of the subcooling on the unit at startup and use this value as
a benchmark.
•
EXV is at minimum position and discharge superheat is low (below 22 degrees F). The circuit
controller View Refrigerant Screen #7 displays the valve position and the valve range. The minimum
position occurs when the valve position value remains at the lower limit of the range displayed.
IMM AGSD3-1
71
AGS air-cooled screw compressor chillers are shipped factory-charged with a full operating charge of
refrigerant; but there can be times when a unit must be recharged at the job site. Follow these
recommendations when field charging. Refer to the unit operating charge found in the Physical Data
Tables beginning on page 22 for packaged units and page 50 for remote evaporator units. An initial
charge of 80% to 90% of the nameplate is assumed. Unit charge adjustment should be done at 100% load,
at normal cooling outdoor temperature (preferably higher than 75°F (24°C), and with all fans on. Unit
must be allowed to run 15 minutes or longer so that the condenser fan staging and load is stabilized at
normal operating discharge pressure. For best results, charge with condenser pressure at design
conditions.
Each circuit of the evaporator has a sight glass located in the liquid line. If the unit can be run at close to
ARI conditions (95°F ambient temperature and 44°F chilled water), there should be no bubbles in the
sight glass, but this does not necessarily mean that the unit is correctly charged. Charge until the
superheat and subcooling temperatures are within range. The discharge superheat should be above 22
degrees F.
Procedure to charge an undercharged AGS unit:
1. If a unit is low on refrigerant, first determine the cause before attempting to recharge the unit. Locate
and repair any refrigerant leak. Evidence of oil is a good indicator of leakage. However, oil may not
be visible at all leaks. Liquid leak detector fluids work well to show bubbles at medium size leaks,
but electronic leak detectors can be needed to locate small leaks. Do not use oil/refrigerant detection
additives.
2. Add the charge to the system only through the evaporator charging valve.
3. The charge must be added at the 100% slide valve position and above conditions.
4. Add sufficient charge to clear the conditions listed above under “Indications of a low refrigerant R134a charge”.
5. Overcharging of refrigerant will raise the condenser pressure and increase the condenser subcooling.
Standard Controls
NOTE: A complete explanation of the MicroTech II controller and unit operation is contained in the
Operation Manual OM AGS.
Thermistor sensors
Evaporator leaving water temperature - This sensor is located on the evaporator water outlet
connection and is used for capacity control of the chiller and low water temperature freeze protection.
Evaporator entering water temperature - This sensor is located on the evaporator water inlet
connection and is used for monitoring purposes and return water temperature reset control.
Evaporator pressure transducer circuit #1, 2 - This sensor is located on the suction side of the
compressor (evaporator outlet) and is used to determine saturated suction refrigerant pressure and
temperature. It also provides low pressure freeze protection.
Condenser pressure transducer circuit #1, 2 - the sensor is located in the discharge line and is used to
read discharge pressure and saturated refrigerant temperature (calculated). The transducer will signal the
controller to hold load or unload the compressor if a rise in head pressure occurs which is outside the
MicroTech II controller setpoint limits. The signal is also used in the calculation of discharge superheat.
Liquid pressure transducer #1, 2 – located on the liquid line ahead of the EXV. It is used to determine
liquid pressure and subcooling and is used to control the EXV.
Outside air - This sensor is located on the back of the control box. It measures the outside air
temperature, is used to determine if low ambient start logic is necessary, and can be the reference for low
ambient temperature lockout.
72
IMM AGSD3-1
Suction temperature circuit #1, 2 - The sensor is located in a well on the suction line. The purpose of
the sensor is to measure refrigerant temperature and superheat.
Discharge line temperature circuit #1, 2 - The sensor is located in a well on the discharge line. It
measures the refrigerant temperature and is used to calculate discharge superheat.
Demand limit - This requires a field connection of a 4-20 milliamp DC signal from an external source
such as a building automation system. It will determine the maximum number of cooling stages that can
be energized.
Evaporator water temperature reset - This requires a 4-20 milliamp DC signal from a building
automation system or temperature transmitter to reset the leaving chilled water setpoint.
High condenser pressure control
MicroTech II control is equipped with high pressure transducers on each refrigerant circuit. The main
purpose of the high pressure transducer is to maintain proper head pressure control. It also sends a signal
to the MicroTech II control to unload the compressor in the event of an excessive rise in discharge
pressure to 275 psig (1896 kPa). Also, MicroTech II control will inhibit additional circuit loading at 267
psig (1841 kPa). The high pressure switch trip setting is 282 psig (1944 kPa). The high pressure alarm is
in response to the signal sent by the pressure transducer.
Mechanical high pressure equipment protection control
The high pressure equipment protection control is a single pole, pressure-activated switch that opens on a
pressure rise. When the switch opens, the control circuit is de-energized, dropping power to the
compressor and fan motor contactors. The switch is factory set (non-adjustable) to open at 310 psig (2137
kPa) ±7 psig and reclose at 200 psig (1379 kPa) ±7 psig. Although the high pressure switch will close
again at 200 psig (1379 kPa), the control circuit will remain locked out and it must be reset through the
MicroTech II control.
The control is mounted on the rear of the compressor. See page 62.
Compressor motor protection
The compressors are supplied with two types of motor protection. Solid state electronic overloads
mounted in the control box sense motor current to within 2% of the operating amps. The MUST TRIP
amps are equal to 140% of unit nameplate compressor RLA. The MUST HOLD amps are equal to 125%
of unit nameplate RLA. A trip of these overloads can result from the unit operating outside of normal
conditions. Repeat overload trips under normal operation can indicate wiring or compressor motor
problems. The overloads are manual reset and must be reset at the overload, as well as through the
MicroTech II controller.
The compressors also have a solid state Guardister circuit that provides motor over temperature
protection. The Guardister circuit has automatic reset and gives a Starter Fault (F75) that is cleared
through the starter display and must also be reset through the MicroTech II control.
Head pressure control (standard)
The MicroTech II controller automatically cycles the condenser fans in response to condenser pressure.
Each fan in a circuit is cycled independently for 4, 5 or 6 steps per circuit, depending on the unit size.
This maintains head pressure and allows the unit to run at ambient air temperatures down to 35°F (1.7°C).
The settings are adjustable through the controller.
Each fan added has a decreasing percentage effect, so the control pressure band is smaller when more
fans are on and largest with only one or two fans on.
Unit operation with the standard control is satisfactory down to outdoor temperatures of 35°F (-1.7°C).
Below this temperature, the VFD option is required to regulate the speed of the first fan on the circuit to
adequately control the discharge pressure. The VFD option allows unit operation to 0°F (-17.8°C)
outdoor temperature, assuming no greater than 5-mph wind.
IMM AGSD3-1
73
Head pressure control (optional low ambient)
The optional low ambient control includes a variable frequency drive (VFD) on the first fan on each
circuit. The remaining fans cycle based on discharge pressure. This control must be used for operation in
ambient temperatures below 35°F (1.7°C) down to 0°F (-17.8°C).
NOTE: VFD and standard fan cycling will provide proper operating refrigerant discharge pressures at
the ambient temperatures listed for them, provided the coil is not affected by the existence of wind.
Louvers must be utilized for low ambient operation if the unit is subjected to winds greater than 5 mph.
Compressor short cycling protection
The MicroTech II controller contains logic to prevent rapid compressor restarting. Excessive compressor
starts can be hard on starting components and create excessive motor winding temperatures. The anticycle timers are set for a five-minute stop-to-start cycle and a 20-minute start-to-start cycle. Both are
adjustable through the MicroTech II control.
74
IMM AGSD3-1
Controls, Settings and Functions
Table 48, Controls
DESCRIPTION
FUNCTION
SYMBOL
SETTING
RESET
LOCATION
Compressor
Heaters
To provide heat to drive off liquid
refrigerant when compressor is off.
HTR1-COMPR
On, when
compressor is off.
N/A
On the
Compressor
Compressor
Solenoid - Load
Loads compressor
LOAD
N/A
N/A
On the
Compressor
Compressor
Solenoid - Unload
Unloads the compressor
UNLOAD
N/A
N/A
On the
Compressor
Evaporator Heaters
Help prevent evaporator freeze-up
HTR-EVAP
38oF (3.3oC)
N/A
Evap. Barrel
Electronic
Expansion
Valve Board
To provide power and step control to the
EXV stepper motors commanded by the
MT II.
EXV-DRIVER
N/A
N/A
Control Panel
Electronic
Expansion
Valve
To provide efficient unit refrigerant flow
and control subcooling.
EXV
In Controller
Code
N/A
In Main Liquid
Line
Solid State Starter
Thermistor Card
To provide motor temperature protection
at about 220oF (104oC).
K2 Fault
None,
Inherent in design
Auto
Power Panel
Mechanical High
High Pressure
Switch
For UL, ETL, etc., safety code to prevent
high pressure above the relief valve.
MHPR
Refer to
OM AGS
Auto
Control Panel
MicroTech II Unit
Controller
To control unit functions. Refer to OM
AGS.
UNIT
CONTROLLER
N/A
Refer to
OM AGS
Control Panel
MicroTech II Circuit
Controllers
To control individual circuit functions. One
per circuit. Refer to OM AGS.
CIRCUIT
CONTROLLER
N/A
Refer to
OM AGS
Control Panel
Oil Level Sensor
Senses oil level in compressor
OLS
NC with oil
present
N/A
On
compressor
Fan VFD (Optional)
Controls discharge pressure
FAN VFD
In controller code
N/A
Power Panel
Control Panel
Heater
Maintain controller operation
HTRCONTROL BOX
On at 40°F
N/A
Control Panel
Lightning Arrestor
To protect from high voltage spikes and
surges.
LA
N/A
N/A
Power Panel
High Oil Delta-P
Switch
Protects compressor from running with
insufficient oil pressure
LPS
Refer to OM AGS
Auto
IMM AGSD3-1
75
Troubleshooting Chart
Table 49, Troubleshooting
PROBLEM
Compressor will not
run.
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1.
2.
3.
Main power switch open.
Unit S1 system switch open.
Circuit switch, CS in pumpdown position.
1.
2.
3.
4.
5.
6.
Chilled water flow switch not closed.
Circuit breakers open.
Fuse blown or circuit breakers tripped.
4.
5.
6.
7.
Compressor overload tripped.
7.
8.
9.
Defective compressor contactor or contactor coil.
System shut down by protection devices.
8.
9.
Close switch.
Check unit status on MicroTech II display. Close switch.
Check circuit status on MicroTech II display. Close switch. Check
pump operation for flow.
Check unit status on MicroTech display. Close switch.
Close circuit breakers.
Check electrical circuits and motor windings for shorts or grounds.
Investigate for possible overloading. Check for loose or corroded
connections. Reset breakers or replace fuses after fault is corrected.
Overloads are manual reset. Reset overload at button on overload.
Clear alarm on MicroTech II display.
Check wiring. Repair or replace contactor.
Determine type and cause of shutdown and correct problem before
attempting to restart.
Check control settings. Wait until unit calls for cooling.
See 6,7,8 above.
Check circuits for voltage at required points. Tighten all power wiring
terminals.
10. No cooling required.
11. Motor electrical trouble.
12. Loose wiring.
10.
11.
12.
1.
2.
Compressor Internal problem.
Oil injection not adequate.
1.
2.
Contact McQuay Factory Service.
Check that oil sight glass has oil visible during steady operation
Check pressure drop across oil filter and oil separator sight glasses
Compressor
Overload K2
Tripped or Circuit
Breaker Trip or
Fuses Blown
1.
2.
3.
4.
5.
Low voltage during high load condition.
Loose power wiring.
Power line fault causing unbalanced voltage.
Defective or grounded wiring in the motor.
High discharge pressure.
1.
2.
3.
4.
5.
Check supply voltage for excessive voltage drop.
Check and tighten all connections.
Check supply voltage.
Check motor and replace if defective.
See corrective steps for high discharge pressure.
Compressor Will
Not Load or Unload
1.
2.
Defective capacity control solenoids.
Unloader mechanism defective.
1.
2.
Check solenoids for proper operation. See capacity control section.
Contact McQuay Factory Service .
1.
Noncondensables in the system.
1.
2.
3.
Fans not running.
Fan control out of adjustment.
2.
3.
4.
System overcharged with refrigerant.
4.
5.
6.
7.
Dirty condenser coil.
Air recirculation from fan outlet into unit coils.
Air restriction into unit.
5.
6.
7.
Remove noncondensables from the condenser coil after shutdown per
EPA regulations.
Check fan fuses and electrical circuits.
Check that fan setup in the controller matches unit fan number. Check
MicroTech II condenser pressure sensor for proper operation.
Check discharge superheat and condenser subcooling. Remove the
excess charge.
Clean the condenser coil.
Remove the cause of recirculation.
Remove obstructions near unit.
1.
2.
Wind effect or a low ambient temperature.
Condenser fan control not correct.
1.
2.
3.
4.
Low suction pressure.
Compressor operating unloaded.
3.
4.
1.
Inadequate refrigerant charge quantity.
1.
2.
3.
Clogged liquid line filter-drier.
Expansion valve malfunctioning.
2.
3.
4.
5.
6.
7.
8.
Insufficient water flow to evaporator.
Water temperature leaving evaporator is too low.
Evaporator tubes fouled.
Suction valve (partially) closed.
Glycol in chilled water system
4.
5.
6.
7.
8.
Check liquid line sight glass. Check unit for leaks. Repair and
recharge to clear sight glass at full load, all fans on, 75°F min OAT..
Check pressure drop across the filter-drier. Replace filter-driers.
Check expansion valve superheat and valve opening position.
Replace valve only if certain valve is not working.
Check water pressure drop across the evaporator and adjust gpm.
Adjust water temperature to higher value.
Inspect by removing water piping. Clean chemically.
Open valve.
Check glycol concentration
1.
2.
Insufficient oil.
Low discharge pressure.
1.
2.
Check oil line and separator sight glasses.
Faulty EXV.
1.
2.
3.
Excessive load - high water temperature.
Compressor unloaders not loading compressor.
Superheat is too low.
1.
2.
3.
4.
System overcharged
4.
Reduce load or add additional equipment.
See corrective steps below for failure of compressor to load.
Check superheat on MicroTech II display. Check suction line sensor
installation and sensor.
Check charge, an overcharge raises suction pressure
Compressor Noisy
or Vibrating
High Discharge
Pressure
Low Discharge
Pressure
Low Suction
Pressure
Low Oil Level Trip
High Suction
Pressure
76
Protect unit against excessive wind into vertical coils.
Check that fan setup in the MicroTech II controller matches unit fan
number. Check VFD fan on units with VFD option.
See corrective steps for low suction pressure.
See corrective steps for failure to load.
IMM AGSD3-1
Periodic Maintenance Log
Date of inspection:
Address:
Facility/job name:
City/State:
Unit model number:
Physical location of unit:
Unit serial number:
Service technical (name):
Software identification:
Operating hours:
Compressor #1
Compressor #2
Number of starts
Compressor #1
Compressor #2
Follow up service required:
Yes
No
General Actions to be Taken
Upper part of report completed: Yes
No
Fill in above
Compressor operation:
1. Mechanical operation acceptable (noise, vibration, etc.)?
2. Look at cycling and cooling, is unit controlling at set points?
3. No refrigerant leaks (full liquid sight glass)?
4. Liquid line moisture indicator shows dry system?
5. Proper condensing fan operation?
6. Condenser coil clean?
7. No corrosion or paint problems?
Compressor electrical operation:
8. Satisfactory electrical operation?
9. MicroTech II hardware operation satisfactory?
10. MicroTech II software operation satisfactory?
Yes
No
Explain all “No” checks
Data from MicroTech II Controller:
11. Unit status
%
12. Circuit status 1
% Capacity
13. Water temperature – Evaporator:
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
Circuit status 2
% Capacity
Entering/Leaving
/
Circuit #1
No. of fan states active:
Evaporator pressure:
Condenser pressure:
EXV position – Steps open or percent open:
Superheat:
Subcooling:
Liquid line temperature:
Outside air temperature:
Leaving evaporator setpoint temperature:
Reset option programmed? Yes
Is VFD included?
Yes
Current alarm: ___ ___ ___
Previous alarm – Show all:
Circuit #1
No
No
Circuit #2
Ice storage unit?
Yes
No
VFD operation OK?
Yes
No
Circuit #1 ______Circuit #2 ______
Alarm Type
Date
Circuit #2
27. Compressor starts See note 1
Circuit #1
Circuit #2
_________________
_________________
28. Compressor run hours
Circuit #2
_________________
Circuit #1
_________________
Data at Job Site:
29.
30.
31.
32.
Volts:
L1_____ L2_____ L3_____
Amps:
Comp #1 Ph 1____ PH 2____ PH 3____
Amps:
Comp #2 PH 1____ PH 2____ PH 3____
Vibration – Read every six months using IRD (or equal) unfiltered at flat on top of motor end: ______ In/Sec Comp #1
______ In/Sec Comp #2
NOTE 1: If the number of starts exceeds the number of run hours, the unit is short cycling. This must be corrected as it can reduce compressor
life.
IMM AGSD3-1
77
All McQuay equipment is sold pursuant to McQuay’s Standard Terms and Conditions of
Sale and Limited Product Warranty. Consult your local McQuay Representative for
warranty details. Refer to form 933-430285Y-00-A (09/08). To find your local
representative, go to www.mcquay.com
This document contains the most current product information as of this printing. For the
most up-to-date product information, please go to www.mcquay.com
(800) 432-1342 • www.mcquay.com
IMM AGSD3-1 (4/10)
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising