Bard H48A2-A Installation Instructions Manual
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INSTALLATION INSTRUCTIONS
WALL MOUNTED PACKAGED
AIR CONDITIONERS
Models:
H42A2-A
H48A2-A
H60A2-A
H42L2-A
H48L2-A
H60L2-A
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506 www.bardhvac.com
Manual : 2100-585B
Supersedes: 2100-585A
Date: 10-09-14
Page 1 of 19
CONTENTS
Getting Other Information and Publications 3
Wall Mount General Information
Wall Mount Model Nomenclature .............................. 4
Shipping Damage ..................................................... 4
General ................................................................ 4
Duct Work ................................................................ 5
Filters ................................................................ 5
Condensate Drain .................................................... 5
Installation Instructions
Wall Mounting Information ........................................ 6
Mounting the Unit ...................................................... 6
Clearances Required ................................................ 6
Minimum Clearances ................................................ 6
Wiring – Main Power ............................................... 12
Wiring – Low Voltage Wiring ................................... 12
Dirty Filter Switch & Relay ...................................... 12
Economizer Fail Time Delay Relay ......................... 12
Start Up
General .............................................................. 13
Topping Off System Charge .................................... 13
Safety Practices ...................................................... 13
Important Installer Note ........................................... 13
High Pressure Switch .............................................. 13
Condenser Fan Operation ...................................... 14
Service Hints ........................................................... 14
Sequence of Operation ........................................... 14
Compressor Control Module ................................... 14
Adjustments ............................................................ 14
Pressure Service Ports ........................................... 14
Troubleshooting
Fan Blade Setting Dimensions ................................ 15
Refrigerant Charge ................................................. 15
Removal of Fan Shroud .......................................... 15
Figures
Figure 1 Unit Dimensions ...................................... 7
Figure 2 Mounting Instructions - H42, 48, 60 ........ 8
Figure 3 Electric Heat Clearance .......................... 9
Figure 4 Wall Mounting Instructions .................... 10
Figure 5 Wall Mounting Instructions .................... 10
Figure 6 Common Wall Mounting Installations .... 11
Figure 7 Fan Blade Setting ................................. 15
Tables
Table 1 Fan Blade Dimensions .......................... 15
Table 2 Cooling Pressure .................................. 16
Table 3 Electrical Specifications H**A, H**L ...... 17
Table 4 Recommended Airflow .......................... 18
Table 5 Indoor Blower Performance .................. 18
Table 6 Electric Heat .......................................... 18
Table 7 Optional Accessories ............................ 19
Table 8 Vent & Control Options ......................... 19
Manual 2100-585B
Page 2 of 19
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard.
National Electrical Code .......................ANSI/NFPA 70
Standard for the Installation ............... ANSI/NFPA 90A of Air Conditioning and Ventilating Systems
Standard for Warm Air ....................... ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for ......................... ACCA Manual J
Residential Winter and Summer Air Conditioning
Duct Design for Residential ............... ACCA Manual D
Winter and Summer Air Conditioning and Equipment
Selection
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA Air Conditioning Contractors of America
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
ASHRAE American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400
Fax: (404) 321-5478
NFPA National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: (800) 344-3555
Fax: (617) 984-7057
Manual 2100-585B
Page 3 of 19
WALL MOUNT GENERAL INFORMATION
AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE
H
MODEL NUMBER
CAPACITY
42 - 3½ Ton
48 - 4 Ton
60 - 5 Ton
42 A 2 –
REVISIONS
A
VOLTS & PHASE
A - 230/208/60/1
05
KW
Y P
A - Right Hand Air Conditioner
L - Left Hand Air Conditioner
X
COLOR OPTIONS
X - Beige (Standard)
1 - White
4 - Buckeye Gray
5 - Desert Brown
6 - Dark Bronze
A - Aluminum
S - Stainless Steel
COIL OPTIONS
X - Standard
1 - Phenolic Coated Evaporator
2 - Phenolic Coated Condenser
3 - Phenolic Coated Evaporator
and Condenser
OUTLET OPTIONS
X - Front (Standard)
VENTILATION OPTIONS
B - Blank-off Plate (No Ventilation)
Y - 100% Economizer Temperature
Z - 100% Economizer Enthalpy
FILTER OPTIONS
P - 2 inch Pleated MERV 8
X X J
CONTROL MODULES
(See Spec. Sheet)
SHIPPING DAMAGE
Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.
GENERAL
The equipment covered in this manual is to be installed by trained, experienced service and installation technicians.
The refrigerant system is completely assembled and charged. All internal wiring is complete.
The unit is designed for use with or without duct work.
Flanges are provided for attaching the supply and return ducts.
These instructions explain the recommended method to install the air cooled self-contained unit and the electrical wiring connections to the unit.
These instructions and any instructions packaged with any separate equipment required to make up the entire air conditioning system should be carefully read before beginning the installation. Note particularly “Starting
Procedure” and any tags and/or labels attached to the equipment.
While these instructions are intended as a general recommended guide, they do not supersede any national and/or local codes in any way. Authorities having jurisdiction should be consulted before the installation is made. See Page 3 for information on codes and standards.
Size of unit for a proposed installation should be based on heat loss calculation made according to methods of Air Conditioning Contractors of America (ACCA).
The air duct should be installed in accordance with the
Standards of the National Fire Protection Association for the Installation of Air Conditioning and Ventilating
Systems of Other Than Residence Type, NFPA No.
90A, and Residence Type Warm Air Heating and Air
Conditioning Systems, NFPA No. 90B. Where local regulations are at a variance with instructions, installer should adhere to local codes.
Manual 2100-585B
Page 4 of 19
DUCT WORK
All duct work, supply and return, must be properly sized for the design airflow requirement of the equipment. Air Conditioning Contractors of America
(ACCA) is an excellent guide to proper sizing. All duct work or portions thereof not in the conditioned space should be properly insulated in order to both conserve energy and prevent condensation or moisture damage.
Refer to Table 5 for maximum static pressure available for duct design.
Design the duct work according to methods given by the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should be insulated with a minimum of one inch of insulation.
Use insulation with a vapor barrier on the outside of the insulation. Flexible joints should be used to connect the duct work to the equipment in order to keep the noise transmission to a minimum.
For model series H42, H48 and H60 a 1/4 inch clearance to combustible material for the first three feet of duct attached to the outlet air frame is required. See
Wall Mounting Instructions and Figures 2 and 3 for further details.
Ducts through the walls must be insulated and all joints taped or sealed to prevent air or moisture entering the wall cavity.
Some installations may not require any return air duct.
A metallic return air grille is required with installations not requiring a return air duct. The spacing between louvers on the grille shall not be larger than 5/8 inch.
Any grille that meets with 5/8 inch louver criteria may be used. It is recommended that Bard Return Air Grille
Kit RG5 or RFG5 be installed when no return duct is used. Contact distributor or factory for ordering information. If using a return air filter grille, filters must be of sufficient size to allow a maximum velocity of 400 fpm.
NOTE: If no return air duct is used, applicable installation codes may limit this cabinet to installation only in a single story structure.
FILTERS
A 2-inch pleated MERV 8 is standard with each unit. The filter slides into position making it easy to service. This filter can be serviced from the outside by removing the filter access panel.
CONDENSATE DRAIN
A plastic drain hose extends from the drain pan at the top of the unit down to the unit base. There are openings in the unit base for the drain hose to pass through. In the event the drain hose is connected to a drain system of some type, it must be an open or vented type system to assure proper drainage.
Manual 2100-585B
Page 5 of 19
INSTALLATION INSTRUCTIONS
WALL MOUNTING INFORMATION
1. Two holes for the supply and return air openings must be cut through the wall as shown in Figure 2.
2. On wood frame walls, the wall construction must be strong and rigid enough to carry the weight of the unit without transmitting any unit vibration.
3. Concrete block walls must be thoroughly inspected to insure that they are capable of carrying the weight of the installed unit.
MOUNTING THE UNIT
1. These units are secured by wall mounting brackets which secure the unit to the outside wall surface at both sides. A bottom mounting bracket, attached to skid for shipping, is provided for ease of installation, but is not required.
2. The unit itself is suitable for 0 inch clearance, but the supply air duct flange and the first 3 feet of supply air duct require a minimum of 1/4 inch clearance to combustible material for model series
H42, H48 and H60. However, it is generally recommended that a 1-inch clearance is used for ease of installation and maintaining the required clearance to combustible material. See Figure 2 for details on opening sizes.
3. Locate and mark lag bolt locations and bottom mounting bracket location. See Figure 2.
4. Mount bottom mounting bracket.
5. Hook top rain flashing, attached to front - right of supply flange for shipping, under back bend of top.
6. Position unit in opening and secure with 5/16 lag bolts; use 7/8 inch diameter flat washers on the lag bolts.
7. Secure rain flashing to wall and caulk across entire length of top. See Figure 2.
WARNING
Failure to provide the 1/4 inch clearance between the supply duct and a combustible surface for the first 3 feet of duct can result in fire causing damage, injury or death.
8. For additional mounting rigidity, the return air and supply air frames or collars can be drilled and screwed or welded to the structural wall itself
(depending upon wall construction). Be sure to observe required clearance if combustible wall.
9. On side-by-side installations, maintain a minimum of 20 inches clearance on right side to allow access to control panel and heat strips, and to allow proper airflow to the outdoor coil. Additional clearance may be required to meet local or national codes.
10. Care should be taken to ensure that the recirculation and obstruction of condenser discharge air does not occur. Recirculation of condenser discharge air can be from either a single unit or multiple units.
Any object such as shrubbery, a building or other large object can cause obstructions to the condenser discharge air. Recirculation or reduced airflow caused by obstructions will result in reduced capacity, possible unit pressure safety lockouts and reduced unit service life.
For units with blow through condensers, it is recommended there be a minimum distance of 10' between the front of the unit and any barrier or 20' between the fronts of two opposing (facing) units.
Clearances Required for Service Access and Adequate Condenser Airflow
MODELS LEFT SIDE RIGHT SIDE
H42A, H48A, H60A
H42L, H48L, H60L
20"
20"
20"
20"
NOTE: For side by side installation of two (2) H**A models there must be 20" between units. This can be reduced to 15" by using a H**L model (left side compressor and controls) for the left unit and HA (right side compressor and controls) for right unit.
Minimum Clearances Required to
Combustible Materials
MODELS
SUPPLY AIR DUCT
FIRST THREE FEET
CABINET
H42A, L / H48A, L
H60A, L
1/4" 0"
Manual 2100-585B
Page 6 of 19
FIGURE 1
Dimensions of Basic Unit for Architecural & Installation Requirements (Nominal)
MODEL
WIDTH
(W)
DEPTH
(D)
HEIGHT
(H)
SUPPLY
A B
RETURN
C B E F G I J K L M N O P Q R S T
H42A
H42L
H48A
H48L
H60A
H60L
42.075
22.432
84.875
9.88 29.88 15.88 29.88 43.88 19.10 31.66 30.00 32.68 26.94 34.69 32.43 3.37 43.00 23.88 10.00 1.44 16.00 1.88
All dimensions are in inches. Dimensional drawings are not to scale.
H**A
RIGHT
UNIT W
4° Pitch
Heater
Access
D
E
O
.44
C. Breaker/
Disconnect
2.13
A
I
Side Wall
Mounting
Brackets
(Built In)
Supply Air Opening
B
R
S
Top Rain
Flashing
S
5.88
F
G
Filter Access Panel 1
Ventilation Air
Condenser
Air Outlet
Front View
Economizer
Controls
Standard flush vent non-Econ.
models
7"
Low Voltage
Electrical
Entrance
High Voltage
Electrical
Entrance
Cond.
Air
Inlet
Side View
C H
J
K
Drain
Optional
Entrances
L
M
P
N
Q
Return Air Opening
Back View
S
S
S
T
Bottom Installation
Bracket
MIS-3624
Not used when EWM Economizer is installed. Filter access is through the EWM hood.
H**L
LEFT
UNIT
Heat
Heater
E
O
.44
D W
R
S
Supply Air Opening
B
(Built In)
2.13
A
(Lockable)
Standard flush vent door for
non-Econ.
models
S
Top Rain
Flashing
I
Economizer
(opposite side)
S
Return Air Opening
Electrical
Entrances
C
Filter Access Panel 1 5.88
Ventilation Air F
S
S P
M
L
H
K
J
Cond.
Air
Inlet
7"
Condenser
Air Outlet
T
High Voltage
Entrance
Drain
Back View N Side View Front View
Installation
Bracket
Q
Not used when EWM Economizer is installed. Filter access is through the EWM hood.
G
MIS-3625
Manual 2100-585B
Page 7 of 19
Manual 2100-585B
Page 8 of 19
1 2
7 8
1 8
4" Ty
1 8
1 2
4" Ty
1 2
7 8
FIGURE 3
ELECTRIC HEAT CLEARANCE
H42A2, H42L2, H48A2, H48L2, H60A2, H60L2
NOTE 1: SIDE SECTION VIEW OF SUPPLY AIR
DUCT FOR WALL MOUNTED UNIT SHOWING 1/4
INCH CLEARANCE TO COMBUSTIBLE SURFACES.
WARNING
A minimum of 1/4 inch clearance must be maintained between the supply air duct and combustible materials. This is required for the first 3 feet of ducting.
It is important to insure that the 1/4 inch minimum spacing is maintained at all points.
Failure to do this could result in overheating the combustible material and may result in a fire causing damage, injury or death.
Manual 2100-585B
Page 9 of 19
FIGURE 4
WALL MOUNTING INSTRUCTIONS
SEE FIGURE 3 – MOUNTING INSTRUCTIONS
FACTORY SUPPLIED
RAIN FLASHING.
MOUNT ON UNIT
BEFORE INSTALLATION
WALL STRUCTURE
SUPPLY AIR
OPENING
SUPPLY AIR
DUCT
RETURN AIR
OPENING
RETURN AIR
OPENING
RETURN AIR
OPENING
WOOD OR STEEL SIDING
BOTTOM MOUNTING
INSTALLING UNIT.
SIDE VIEW MIS-548 A CONCRETE BLOCK WALL INSTALLATION
MIS-549 B
Manual 2100-585B
Page 10 of 19
WOOD FRAME WALL INSTALLATION
FIGURE 5
WALL MOUNTING INSTRUCTIONS
ATTACH TO TOP
PLATE OF WALL
SEE UNIT DIMENSIONS, FIGURE 2,
FOR ACTUAL DIMENSIONS.
E + 1.000
B
1.000
1.000" CLEARANCE
ALL AROUND DUCT
INTERIOR FINISHED WALL
OVER FRAME
1.000" CLEARANCE
ALL AROUND DUCT
SUPPLY DUCT
OPENING
A
I
RETURN DUCT
OPENING
C
EXTERIOR FINISH WALL
OVER FRAME
K
2 x 6
C L
FRAMING MATERIAL
2 x 4'S, 2 x 6'S &/OR
STRUCTURAL STEEL
ATTACH TO BOTTOM
PLATE OF WALL
THIS STRUCTURAL MEMBER
LOCATED TO MATCH STUD
SPACING FOR REST OF WALL.
A SECOND MEMBER MAY BE
REQUIRED FOR SOME WALLS.
FIGURE 6
COMMON WALL MOUNTING INSTALLATIONS
RAIN
FLASHING
OUTSIDE
WALL
RAFTERS
FINISHED CEILING SURFACE
SUPPLY AIR DUCT
W/ GRILLE
RETURN AIR
OPENING W/ GRILLE
OUTSIDE
WALL
FREE AIR FLOW
NO DUCT
SUPPLY DUCT MAY BE LOCATED IN AN ATTIC
OR BELOW CEILING RAFTERS AS SHOWN
RAFTERS
SUPPLY AIR DUCT
FINISHED CEILING SURFACE
RETURN AIR
OPENING W/ GRILLE
DUCTED SUPPLY
RETURN AT UNIT
SUPPLY DUCT MAYBE LOCATED IN AN ATTIC
OR BELOW CEILING RAFTERS AS SHOWN
RAIN
FLASHING
RAFTERS
SUPPLY AIR DUCT
RAIN
FLASHING
OUTSIDE
WALL
FINISHED
CEILING SURFACE
WALL SLEEVE
RETURN AIR
SPACE
FALSE WALL
RETURN AIR GRILLE
OUTSIDE
WALL
FALSE WALL INSTALLATION
SUPPLY DUCT MAYBE LOCATED IN AN ATTIC
OR BELOW CEILING RAFTERS AS SHOWN
RAFTERS
SUPPLY AIR DUCT
LOWERED
CEILING SUPPLY AIR
GRILLE
FINISHED CEILING
SURFACE
CLOSET WALL
WALL
SLEEVE
RAISED FLOOR
RETURN AIR
RETURN AIR
GRILLE
CLOSET INSTALLATION
MIS-550 C
Manual 2100-585B
Page 11 of 19
WIRING – MAIN POWER
Refer to the unit rating plate for wire sizing information and maximum fuse or circuit breaker size. Each outdoor unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire. Each unit and/or wiring diagram will be marked “Use Copper
Conductors Only”. These instructions must be adhered to.
Refer to the National Electrical Code (NEC) for complete current carrying capacity data on the various insulation grades of wiring material. All wiring must conform to NEC and all local codes.
The electrical data lists fuse and wire sizes (75° C copper) for all models including the most commonly used heater sizes. Also shown are the number of field power circuits required for the various models with heaters.
The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor motor.
The disconnect access door on this unit may be locked to prevent unauthorized access to the disconnect. To convert for the locking capability, bend the tab located in the bottom left-hand corner of the disconnect opening under the disconnect access panel straight out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole in the tab preventing entry.
See “Start Up” section for important information on three phase scroll compressor start ups.
See Tables 3 & 4 for Electrical Specifications.
Low Voltage Connection
These units use a 24-volt AC low voltage circuit. The
“RT” terminal is the 24V transformer output, and the
“R” terminal is the 24VAC hot terminal for the operation of the equipment. “RT” and “R” are connected with brass jumper bar which can be removed and “RT” and
“R” connected to external NC (normally closed) contact such as a fire/smoke detector that will cause immediate shutdown of the equipment upon activation.
“C” terminal is grounded.
“G” terminal is the fan input.
“Y” terminal is the compressor input for cooling
1-Stage units only
“W1” terminal is the 1st stage electric heat.
“W2” terminal is the 2nd stage heat (if equipped).
“E”, “F”, “Y2” & “A” Used with EWM-T Economizer.
“1” NO (normally open) lockout alarm.
“2” NC (normally closed) lockout alarm.
“3” COM lockout alarm.
“4” & “5” dirty filter alarm NC (normally closed).
“6” Used with MD4000 only; do not use for anything else!
“Y1” & “7” Used with EWM-T Economizer; do not use for anything else!
“8” & “9” ECON Fail Alarm.
WIRING – LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase equipment dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are:
TAP RANGE
240
208
253 – 216
220 – 187
NOTE: The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition).
For H model units with Y or Z vent option economizers, refer to the MV4000 Series Lead/Lag Controller manual
2100-571 for low voltage connections diagrams.
Factory installed Y and Z vent option are wired per
Figure 7 of 2100-571.
DIRTY FILTER SWITCH & RELAY
These units include a dirty filter switch and relay. The alarm output of relay is normally closed, open on alarm and is connected to terminals 4 and 5 of the unit low voltage terminal block.
ECONOMIZER FAIL TIME DELAY RELAY
NOTE: Applies only to units with economizers.
These units employ a time delay relay used in conjunction with the 100% Economizers to provide an economizer fail alarm. The alarm output is connected to terminals 8 and 9 of the low voltage terminal block.
The time delay should be set to no less than 3 minutes to ensure no nuisance alarms.
TIMER TO BE
SET HERE
MIS-3054
MIS-3054
Manual 2100-585B
Page 12 of 19
THESE UNITS REQUIRE R-410A
REFRIGERANT AND POLYOL
ESTER OIL.
GENERAL:
1. Use separate service equipment to avoid cross contamination of oil and refrigerants.
2. Use recovery equipment rated for R-410A
refrigerant.
3. Use manifold gauges rated for R-410A (800 psi/250 psi low).
4. R-410A is a binary blend of HFC-32 and HFC-125.
5. R-410A is nearly azeotropic - similar to R-22 and
R-12. Although nearly azeotropic, charge with liquid refrigerant.
6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot withstand this higher pressure.
7. R-410A has an ozone depletion potential of zero, but must be reclaimed due to its global warming
potential.
8. R-410A compressors use Polyol Ester oil.
9. Polyol Ester oil is hygroscopic; it will rapidly absorb moisture and strongly hold this moisture in the oil.
10. A liquid line dryer must be used - even a deep vacuum will not separate moisture from the oil.
11. Limit atmospheric exposure to 15 minutes.
12. If compressor removal is necessary, always plug compressor immediately after removal. Purge with small amount of nitrogen when inserting plugs.
TOPPING OFF SYSTEM CHARGE
If a leak has occurred in the system, Bard
Manufacturing recommends reclaiming, evacuating
(see criteria above), and charging to the nameplate charge. If done correctly, topping off the system charge can be done without problems.
With R-410A, there are no significant changes in the refrigerant composition during multiple leaks and recharges. R-410A refrigerant is close to being an azeotropic blend (it behaves like a pure compound or single component refrigerant). The remaining refrigerant charge, in the system, may be used after leaks have occurred and then “top-off” the charge by utilizing the pressure charts on the inner control panel cover as a guideline.
START UP
REMEMBER: When adding R-410A refrigerant, it must come out of the charging cylinder/tank as a liquid to avoid any fractionation, and to insure optimal system performance. Refer to instructions for the cylinder that is being utilized for proper method of liquid extraction.
WARNING
Failure to conform to these practices could lead to damage, injury or death.
SAFETY PRACTICES:
1. Never mix R-410A with other refrigerants.
2. Use gloves and safety glasses, Polyol Ester oils can be irritating to the skin, and liquid refrigerant will freeze the skin.
3. Never use air and R-410A to leak check; the mixture may become flammable.
4. Do not inhale R-410A – the vapor attacks the nervous system, creating dizziness, loss of coordination and slurred speech. Cardiac irregularities, unconsciousness and ultimate death can result from breathing this concentration.
5. Do not burn R-410A. This decomposition produces hazardous vapors. Evacuate the area if
exposed.
6. Use only cylinders rated DOT4BA/4BW 400.
7. Never fill cylinders over 80% of total capacity.
8. Store cylinders in a cool area, out of direct
sunlight.
9. Never heat cylinders above 125°F.
10. Never trap liquid R-410A in manifold sets, gauge lines or cylinders. R-410A expands significantly at warmer temperatures. Once a cylinder or line is full of liquid, any further rise in temperature will cause it to burst.
IMPORTANT INSTALLER NOTE
For improved start up performance wash the indoor coil with a dish washing detergent.
HIGH PRESSURE SWITCH
All H**A/H**L wall mounted air conditioner series models are supplied with a remote reset for the high and low pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again.
Manual 2100-585B
Page 13 of 19
START UP (Continued)
CONDENSER FAN OPERATION
Applies to H42, H48 and H60 models only. NOTE:
Certain models may be equipped with a Low Ambient
Control (LAC), and if so equipped the condenser fan motor will have delay start until system refrigerant operationg pressure builds up. After starting, the fan motor may or may not cycle depending upon ambient
conditions. This is normal operation. The condenser fan motor on 230/208 volt, one and three phase, 60 HZ units is a two-speed motor that comes factory wired on high speed for peak performance. If ambient conditions permit, it can be reconnected to low speed (red wire) for lower sound level. See wiring diagram.
SERVICE HINTS
1. Caution owner/operator to maintain clean air filters at all times. Also, not to needlessly close off supply and return air registers. This reduces airflow through the system, which shortens equipment service life as well as increasing operating costs.
2. Check all power fuses or circuit breakers to be sure they are the correct rating.
3. Periodic cleaning of the outdoor coil to permit full and unrestricted airflow circulation is essential.
SEQUENCE OF OPERATION
COOLING – Circuit R-Y makes at thermostat pulling in compressor contactor, starting the compressor and outdoor motor. (See Note under Condenser Fan
Operation if equipped with Low Ambient Control.)
The G (indoor motor) circuit is automatically completed on any call for cooling operation or can be energized by manual fan switch on subbase for constant air circulation. On a call for heating, circuit R-W1 make at the thermostat pulling in heat contact for the strip heat and blower operation. On a call for second stage heat, R-W2 makes bringing on second heat contactor, if so equipped.
COMPRESSOR CONTROL MODULE
The compressor control module is standard on all models covered by this manual. The compressor control module is an anti-short cycle/lockout timer with high and low pressure switch monitoring and alarm relay output.
Adjustable Delay On Make And Break Timer
On initial power up or anytime power is interrupted to the unit, the delay on make period begins, which will be 2 minutes plus 10% of the delay on break setting.
When the delay on make is complete and the high pressure switch and low pressure switch is closed, the compressor contactor is energized. Upon shutdown, the delay on break timer starts and prevents restart until the delay on break and delay on make periods have expired.
During routine operation of the unit with no power interruptions, the compressor will operate on demand with no delay.
Manual 2100-585B
Page 14 of 19
High Pressure Switch and Lockout Sequence
If the high pressure switch opens, the compressor contactor will de-energize immediately. The lockout timer will go into a soft lockout and stay in soft lockout until the high pressure switch closes and the delay on break time has expired. If the high pressure switch opens again in this same operating cycle, the unit will go into manual
lockout condition and the alarm relay circuit will energize.
Recycling the wall thermostat resets the manual lockout.
Low Pressure Switch, Bypass & Lockout Sequence
If the low pressure switch opens for more than 120 seconds, the compressor contactor will de-energize and go into a soft lockout. Regardless the state of the low pressure switch, the contactor will reenergize after the delay on make time delay has expired. If the low pressure switch remains open, or opens again for longer than 120 seconds, the unit will go into manual lockout condition and the alarm relay circuit will energize.
Recycling the wall thermostat resets the manual lockout.
Alarm Relay Output
Alarm terminal is output connection for applications where alarm relay is employed. This terminal is powered whenever the compressor is locked out due to
HPC or LPC sequences as described.
NOTE:Both high and low pressure switch controls are inherently automatic reset devices. The high pressure switch and low pressure switch cut out and cut in settings are fixed by specific air conditioner unit model. The lockout features, both soft and manual, are a function of the Compressor Control Module.
ADJUSTMENTS
Adjustable Delay on Make and Delay on Break Timer
The potentiometer is used to select Delay on Break time from 30 seconds to 5 minutes. Delay on Make (DOM) timing on power-up and after power interruptions is equal to 2 minutes plus 10% of Delay on Break (DOB) setting:
0.5 minute (30 seconds) DOB = 123 second DOM
1.0 minute (60 seconds) DOB = 126 second DOM
2.0 minute (120 seconds) DOB = 132 second DOM
3.0 minute (180 seconds) DOB = 138 second DOM
4.0 minute (240 seconds) DOB = 144 second DOM
5.0 minute (300 seconds) DOB = 150 second DOM
During routine operation of the unit with no power interruptions the compressor will operate on demand with no delay.
Typical Settings for Dual Unit Installation:
Unit 1: DOB set at 2 minutes, and DOM is 132 seconds
Unit 2: DOB set at 4 minutes, and DOM is 144 seconds
PRESSURE SERVICE PORTS
High & low pressure service ports are installed on all units so that the system operating pressures can be observed. A pressure table can be found later in the manual covering all models. It is imperative to match the correct pressure table to the unit by model number. See Table 2.
FAN BLADE SETTING DIMENSIONS
Shown in Figure 7 is the correct fan blade setting for proper air delivery across the outdoor coil. Refer to
Table 1 for unit specific dimension.
Any service work requiring removal or adjustment in the fan and/or motor area will require that the dimensions below be checked and blade adjusted in or out on the motor shaft accordingly.
FIGURE 7
FAN BLADE SETTING
AIRFLOW
MIS-1724
"A"
TROUBLESHOOTING
R-410A
REFRIGERANT CHARGE
This unit was charged at the factory with the quantity of refrigerant listed on the serial plate. AHRI capacity and efficiency ratings were determined by testing with this refrigerant charge quantity.
The following pressure tables show nominal pressures for the units. Since many installation specific situations can affect the pressure readings, this information should only be used by certified technicians as a guide for evaluating proper system performance. They shall not be used to adjust charge. If charge is in doubt, reclaim, evacuate and recharge the unit to the serial plate charge.
REMOVAL OF FAN SHROUD
1. Disconnect all power to the unit.
2. Remove the screws holding both grilles, one on each side of unit, and remove grilles.
3. Remove screws holding fan shroud to condenser and bottom. Nine (9) screws.
4. Unwire condenser fan motor.
5. Slide complete motor, fan blade, and shroud assembly out the left side of the unit.
6. Service motor/fan as needed.
7. Reverse steps to reinstall.
TABLE 1
FAN BLADE DIMENSION
Model
H42A2 / H42L2
H48A2 / H48L2
H60A2 / H60L2
Dimension
A
1.75"
Manual 2100-585B
Page 15 of 19
TABLE 2
COOLING PRESSURE TABLE
Air Temperature Entering Outdoor Coil °F
Model
H42A/L
H48A/L
H60A/L
Return Air Temp
(DB/WB)
75° DB
62° WB
80° DB
67° WB
85° DB
72° WB
75° DB
62° WB
80° DB
67° WB
85° DB
72° WB
75° DB
62° WB
80° DB
67° WB
85° DB
72° WB
Pressure
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
80
127
388
131
402
124
371
133
380
138
393
124
342
133
351
138
363
119
378
75
125
364
129
377
122
346
131
355
136
367
123
320
132
328
137
339
117
355
85
129
413
134
427
126
396
135
406
140
420
126
367
135
376
140
389
121
403
90
132
438
137
453
128
421
137
432
142
447
128
391
137
401
142
415
123
427
95 100 105 110 115 120
136
494
141
511
131
473
140
485
145
502
132
443
141
454
146
470
127
482
134
466
139
482
130
447
139
458
144
474
130
416
139
427
144
442
125
454
140
553
145
572
135
526
144
539
149
558
136
496
145
509
150
527
131
539
138
523
143
541
133
499
142
512
147
530
134
469
143
481
148
498
129
510
142
585
147
605
137
553
146
567
151
587
137
526
147
539
152
558
133
570
144
618
149
640
138
580
148
595
153
616
139
554
149
568
154
588
135
603
Low side pressure ± 4 PSIG
High side pressure ± 10 PSIG
Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate charge weight.
NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated check condenser fan wiring. See “Condenser Fan Operation”.
Manual 2100-585B
Page 16 of 19
TABLE 3
Electrical Specifications 1-Stage Compressor Models
MODEL
H42A2-A00, A0Z
H42L2 A05
A10
A15
H48A2-A00, A0Z
H48L2 A05
A10
A15
H60A2-A00, A0Z
H60L2 A05
A10
A15
Rated
Volts &
Phase
230/208-1
230/208-1
230/208-1
No.
Field
Power
Circuits
1
1
1
1 or 2
1
1
1
1 or 2
1
1
1
1 or 2 l
Minimum
Circuit
Ampacity
39
39
58
84
32
32
58
84
42
42
60
86
Single Circuit
Maximum
External
Fuse or
Ckt. Brkr.
50
50
60
90
50
50
60
90
60
60
60
90
6
4
8
8
6
4
8
8
6
3
8
8 k
Field
Power
Wire
Size k
Ground
Wire
10
10
10
8
10
10
10
8
10
10
10
8 l
Minimum
Circuit
Ampacity
Dual Circuit
Maximum
External
Fuse or Ckt.
Breaker k
Field Power
Wire Size k
Ground Wire
Size
Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B
58
58
60
26
26
26
60
60
60
30
30
30
6
6
6
10
10
10
10
10
10
10
10
10
Maximum size of the time delay fuse or circuit breaker for protection of field wiring conductors.
k Based on 75C copper wire. All wiring must conform to the National Electrical Code and all local codes.
l These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electrical code (latest version),
Article 310 for power conductor sizing.
Caution: When more than one field power circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of Table 310
regarding Ampacity Adjustment Factors when more than three (3) current carrying conductors are in a raceway.
IMPORTANT: While this electrical data is presented as a guide, it is important to electrically connect properly sized fuses and conductor wires in
accordance with the National Electrical Code and all local codes.
Manual 2100-585B
Page 17 of 19
TABLE 4
RECOMMENDED AIRFLOW
Model
H42A, H42L
H48A, H48L
H60A, H60L
Rated
CFM *
1400
1550
1700
Rated
ESP *
.45
.30
.40
* Rated CFM and ESP on high speed tap.
Recommended
Airflow Range
1600 - 1150
1750 - 1285
1950 - 1375
Factory Speed
Connection
High
High
High
TABLE 5
INDOOR BLOWER PERFORMANCE
Speed
ESP
(Inch H20) Dry Coil
0.0
1850
0.1
0.2
0.3
0.4
0.5
1775
1685
1590
1495
1400
High
H42/48
Low High
H60
Wet Coil Dry Coil Wet Coil Dry Coil Wet Coil Dry Coil Wet Coil
1800
1725
1640
1550
1460
1365
1605
1545
1460
1390
1310
1225
1555
1500
1415
1345
1270
1185
2080
2020
1925
1870
1755
1660
2015
1960
1865
1815
1705
1610
1505
1450
1395
1340
1225
1125
Low
1460
1405
1355
1300
1185
1085
Models
KW
5
10
15
TABLE 6
ELECTRIC HEAT
240V-1
Amps BTUH
20.8
41.6
62.5
17065
34130
51250
208V-1
Amps BTUH
18.1
36.2
54.0
12800
25600
38400
Manual 2100-585B
Page 18 of 19
TABLE 7
OPTIONAL ACCESSORIES
EHWA05-A05 X X
EHWA05-A10 X X X
EHWA05-A15 X X X
CIRCUIT BREAKER
WMCB-08A X X
TABLE 8
VENT & CONTROL OPTIONS
Factory Installed
Option Number
N/A
B
Y
Z
F
G
Field Installed
Part Number
CMC-15
BOP-5
EWM5-T*
EWM5-E*
N/A
N/A
Start Kit (230V 1-Phase)
Blank Off Plate
100% Economizer Temperature
100% Economizer Enthalpy
100% Economizer DC Temperature
100% Economizer DC Enthalpy
X
X
X
X
X
X
Manual 2100-585B
Page 19 of 19
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