Bard WH241D User manual

INSTALLATION INSTRUCTIONS
WALL MOUNTED
PACKAGE HEAT PUMP
MODELS
WH241D
Manual : 2100-356
File: Volume III Tab 17
Date: 10-01-99
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914...Moving ahead, just as planned.

Contents
Getting Other Informations and Publications ........ 1
Wall Mount General Information ............................. 2
Heat Pump Wall Mount Model Nomenclature.......... 2
Shipping Damage .................................................... 2
General ................................................................ 2
Duct Work................................................................ 4
Filters ................................................................ 5
Fresh Air Intake ....................................................... 5
Condensate Drain.................................................... 5
Installation Instructions ........................................... 6
Wall Mounting Information....................................... 6
Mounting the Unit .................................................... 6
Wiring – Main Power ............................................. 10
Wiring – Low Voltage Wiring ................................. 10
Thermostat Indicator Lamps ...................................11
Compressor Malfunction Light................................11
Figures
Figure 1 Unit Dimensions...................................... 3
Figure 2 Fresh Air Damper Assembly ................... 5
Figure 3 Mounting Instructions.............................. 7
Figure 4 Wall Mounting Instructions...................... 8
Figure 5 Wall Mounting Instructions...................... 8
Figure 6 Common Wall Mounting Installations...... 9
Figure 7 Unit 24V Terminal Board ....................... 10
Figure 8 Start Up Procedure Decal ..................... 13
Figure 9 Defrost Control Board ........................... 14
Figure 10 Fan Blade Setting ................................. 17
Figure 11 Circuit Diagram H/P Cooling Mode ....... 20
Figure 12 Circuit Diagram H/P Dehumidification... 20
Start Up ................................................................... 12
Important Installer Note ......................................... 12
Crankcase Heaters................................................ 12
Service Hints ......................................................... 12
Sequence of Operation.......................................... 12
Pressure Service Ports.......................................... 13
Defrost Cycle ......................................................... 13
Troubleshooting ..................................................... 15
Solid State Heat Pump Control
Troubleshooting Procedure ................................... 15
Checking Temperature Sensor Outside
Unit Circuit ............................................................. 16
Temperature vs Resistance of
Temperature Sensor .............................................. 16
Fan Blade Setting Dimensions .............................. 17
Removal of Fan Shroud......................................... 17
Refrigerant Charge ................................................ 17
Pressure Tables ..................................................... 18
Optional Accessories ............................................. 19
Tables
Table 1 Electric Heat Table .................................. 1
Table 2 Electrical Specifications .......................... 4
Table 3 Thermostat Wire Size ............................11
Table 4 Wall Thermostat and Subbase
Combinations .........................................11
Table 5 Troubleshooting .................................... 15
Table 6 Fan Blade Dimensions.......................... 17
Table 7 Suction Line Temperatures ................... 17
Table 8 Indoor Blower Performance .................. 17
Table 9 Rated CFM and Raded ESP................. 17
Table 10 Maximum ESP of Operation.................. 17
Table 11 Pressure Table ...................................... 18
Table 12 Pressure Table ...................................... 18
Table 13 Optional Accessories ............................ 19

Manual 2100-356
Page 1
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: [phone]
Fax: [phone]
ANSI —American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE —American Society of Heating Refrigerating,
and Air Conditioning Engineers, Incorporated
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA —National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

Manual 2100-356
Page 2
WALL MOUNT GENERAL INFORMATION
HEAT PUMP WALL MOUNT MODEL NOMENCLATURE
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 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 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 1 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
These instructions explain the recommended method to
install the air cooled self-contained unit and the electrical
wiring connections to the unit.
NOTE: For 0 KW and circuit breakers (230/208 Volt) or pull disconnects (460 Volt) applications, insert 0Z in the KW field of model number.
FILTEROPTIONS
X - One InchThrowaway(Standard)
W - One Inch Washable
P - Two Inch Pleated
COLOROPTIONS
X - Beige
(Standard)
1 - White
2 - Mesa Tan
3 - Colonial White
4 - Buckeye Gray
COILOPTIONS
X- Standard
1 - Phenolic CoatedEvaporator
2 - Phenolic CoatedCondenser
3 - Phenolic CoatedEvaporator
andCondenser
OUTLET OPTIONS
X- Front(Standard)
VENTILATIONOPTIONS
X - Barometric Fresh Air Damper
(Standard)
B - Blank-off Plate
M - Motorized FreshAirDamper
V - Commercial Room Ventilator -
MotorizedwithExhaust
E - Economizer (Internal)-Fully
ModulatingwithExhaust
R - Energy RecoveryVentilator -
withExhaust
CAPACITY
24 - 2 Ton REVISIONS
VOLTS & PHASE
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
KW
WH 24 1 D A 08 X X X X X B
CONTROLMODULES
MODELNUMBER
sledoM
WK
AD142HWBD142HWCD142HW
1-0421-8023-0423-8023-064
AUTBAUTBAUTBAUTBAUTB
47.61056314.4104201
83.33003728.8257402
64.41005025.21063512.757402
TABLE 1
ELECTRIC HEAT TABLE

Manual 2100-356
Page 3
MIS-1261
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ylppuSnruteR
EFGIJKLMNOPQRSTABCD
D142HW03.33521.71365.0788.788.9188.1188.9100.5305.8157.5265.0257.6260.8252.9200.7236.231.4360.7255.0191.400.2100.5
FIGURE 1 – UNIT DIMENSIONS
FRONT VIEW SIDE VIEW BACK VIEW

Manual 2100-356
Page 4
TIUCRICELGNIS
ledoM
detaR stloV dna esahP
dleiF.oN rewoP stiucriC muminiM tiucriC yticapmA
mumixaM lanretxE roesuF tiucriC rekaerB
dleiF rewoP eziSeriW dnuorG eziSeriW
Z0A,00AD142HW 40A 80A 1-802/032 1
1
1
819306 520406 2101
6
210101
Z0B,00BD142HW 60B 1-802/032 1
15133 0253 21 82101
Z0C,00CD142HW 60C 3-064 1
18 71 5102 4121 4121
TABLE 2
ELECTRICAL SPECIFICATIONS
c
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e
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.
DUCT WORK
Any heat pump is more critical of proper operating charge
and an adequate duct system than a straight air conditioning
unit. All duct work, supply and return, must be properly
sized for the design air flow 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 10 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.
A 1/4 inch clearance to combustible material for the first
three feet of duct attached to the outlet air frame is required.
See Pages Wall Mounting Instructions and Figure 3 for
further details.
Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture from entering the
wall cavity.
CAUTION: 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 inches.
Maximum size of the time delay fuse or HACR type circuit breaker for protection
of field wiring conductors.
Based on 75° C copper wire. All wiring must conform to NEC and all local codes.
These “Minimum Circuit Ampacity” values are to be used for sizing the field power
conductors. Refer to the National Electric Code (latest revision), article 310, for
power conductor sizing. CAUTION: When more than one field power conductor
circuit is run through one conduit the conductors must be derated. Pay special
attention to note 89 of table 310 regarding Ampacity Adjustment Factors when
more than 3 are in a raceway.
c
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Manual 2100-356
Page 5
Any grille that meets the 5/8 inch louver criteria may be
used. It is recommended that Bard Return Air Grille Kit
RG2 thru RG5 or RFG2 thru 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 1 inch throwaway filter is supplied with each unit. The
filter slides into position making it easy to service. This
filter can be serviced from the outside by removing the
service door. A 1 inch washable filter and a 2 inch pleated
filter are also available as optional accessories. The internal
filter brackets are adjustable to accommodate the 2 inch
filter by loosening two (2) screws in each bracket assembly
and sliding the brackets apart to the required width and
retightening the four (4) screws.
FRESH AIR INTAKE
All units are built with fresh air inlet slots punched in the
service panel.
If the unit is equipped with a fresh air damper assembly, the
assembly is shipped already attached to the unit. The
damper blade is locked in the closed position. To allow the
damper to operate, the maximum and minimum blade
position stops must be installed. See Figure 2.
All capacity, efficiency, and cost of operation information
as required for Department of Energy “Energyguide” Fact
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.
Sheets is based upon the fresh air blank-off plate in place
and is recommended for maximum energy efficiency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.
FIGURE 2
FRESH AIR DAMPER ASSEMBLY
MIS-938

Manual 2100-356
Page 6
INSTALLATION INSTRUCTIONS
WALL MOUNTING INFORMATION
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 is provided for ease
of installation, but is not required.
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
unit being installed.
4. The unit is suitable for 0 inch clearance from the unit,
and from the supply and return air ducts.
MOUNTING THE UNIT
1. Two holes for the supply and return air openings must
be cut through the wall as shown in Figure 3.
2. Locate and mark lag bolt locations and bottom
mounting bracket location, if desired. See Figure 3.
3. Mount bottom mounting bracket, if used.
4. Hook top rain flashing under back bend of top. Top
rain flashing is shipped secured to the right side of the
back.
5. Position unit in opening and secure with 5/16 lag bolts.
Use 5/16” flat washers on the lag bolts.
6. Secure rain flashing to wall and caulk across entire
length of top. See Figure 3.
7. 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.
8. On side by side installations, maintain a minimum of 20
inches clearance on right side of unit to allow access to
control panel and heaters, and to allow proper airflow to
the outdoor coil. Additional clearance may be required
to meet local or national codes.

Manual 2100-356
Page 7
FIGURE 3
MOUNTING INSTRUCTIONS
MIS-353

Manual 2100-356
Page 8
FIGURE 5
WALL MOUNTING INSTRUCTIONS
SEE UNIT DIMENSIONS, FIGURE 1, FOR ACTUALDIMENSIONS
MIS-549
MIS-548
FIGURE 4
WALL MOUNTING INSTRUCTIONS
SEE FIGURE 3 – MOUNTING INSTRUCTIONS

Manual 2100-356
Page 9
FIGURE 6
COMMON WALL MOUNTING INSTALLATIONS
MIS-550

Manual 2100-356
Page 10
FIGURE 7
UNIT 24V TERMINAL BOARD
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.
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
240 253 - 216
208 220 - 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).
Nine (9) wires should be run from thermostat subbase to the
24V terminal board in the unit. A nine conductor, 18 gauge
copper, color-coded thermostat cable is recommended.. The
connection points are shown in Figure 7.
WIRING – MAIN POWER
Refer to the unit rating plate for wire sizing information and
maximum fuse or “HACR” type 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 “HACR” type 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
IMPORTANT NOTE: Only the thermostat and subbase combinations as shown in Table 4 will work with this equipment.
The thermostat and subbase must be matched, and the correct operation can be assured only be
proper selection and application of these parts.
MIS-1421

Manual 2100-356
Page 11
THERMOSTAT INDICATOR LAMPS
The red lamp marked “Check” will come on if there is any
problem that prevents the compressor from running when it
is supposed to be.
COMPRESSOR MALFUNCTION LIGHT
Actuation of the red lamp is accomplished by a relay output
from the heat pump control board which is factory installed.
Any condition such as high head pressure, etc., that will
prevent compressor from operating will cause red lamp to
activate. This is a signal to the operator of the equipment to
place system in emergency heat position.
TABLE 3
THERMOSTAT WIRE SIZE
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mumixaM ecnatsiD teeFnI
553.2 eguag02 eguag81 eguag61 eguag41 eguag21
5406 001 061 052
TABLE 4
WALL THERMOSTAT AND SUBBASE
COMBINATIONS
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240-3048 )07015G1158T(
taehegats2;loocegats1 elbammargorP-noNcinortcelE revoegnahClaunaMrootuA
wahstreboR )722-003(
taehegats3;loocegats2 elbammargorPyaD7 revoegnahClaunaMrootuA
tatsrenE )2-PHS(
taehegats3;loocegats2 elbammargorPyaD7 revoegnahClaunaMrootuA

Manual 2100-356
Page 12
START UP
IMPORTANT INSTALLER NOTE
For improved start up performance, wash the indoor coil
with a dish detergent.
CRANKCASE HEATERS
WH241 units are provided with compressor crankcase heat.
These models have an insertion well-type heater located in
the lower section of the compressor housing. This is a self-
regulating type heater that draws only enough power to
maintain the compressor at a safe temperature.
Some form of crankcase heat is essential to prevent liquid
refrigerant from migrating to the compressor causing oil
pump out on compressor start up and possible valve failure.
The decal in Figure 8 is affixed to all outdoor units detailing
start up procedure. This is very important. Please read
carefully.
SERVICE HINTS
1. Caution homeowner to maintain clean air filters at all
times. Also, not to needlessly close off supply and
return air registers. This reduces air flow through the
system which shortens equipment service life as well as
increasing operating costs.
2. Switching to heating cycle at 75° F or higher outside
temperature may cause a nuisance trip of the remote
reset high pressure switch. Turn thermostat off, then on,
to reset the high pressure switch..
3. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode before
trying to diagnose any reported service problems.
4. Check all power fuses or circuit breakers to be sure they
are the correct rating.
5. 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. 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.
HEATING – A 24V solenoid coil on reversing valve
controls heating cycle operation. Two thermostat options,
one allowing "Auto" changeover from cycle to cycle and the
other constantly energizing solenoid coil during heating
IMPORTANT
THESE PROCEDURES MUST BE
FOLLOWEDAT INITIAL START UP
AND ATANY TIME POWER HAS
BEEN REMOVED FOR 12 HOURS
OR LONGER.
TO PREVENT COMPRESSOR DAMAGE WHICH
MAY RESULT FROM THE PRESENCE OF LIQUID
REFRIGERANT IN THE COMPRESSOR CRANK-
CASE:
1. MAKE CERTAIN THE ROOM THERMOSTAT IS IN
THE “OFF” POSITION. (THE COMPRESSOR IS
NOT TO OPERATE.)
2. APPLY POWER BY CLOSING THE SYSTEM
DISCONNECT SWITCH. THIS ENERGIZES THE
COMPRESSOR HEATER WHICH EVAPORATES
THE LIQUID REFRIGERANT IN THE CRANK-
CASE.
3. ALLOW 4 HOURS OR 60 MINUTES PER POUND
OF REFRIGERANT IN THE SYSTEM AS NOTED
ON THE UNIT RATING PLATE, WHICHEVER IS
GREATER.
4. AFTER PROPERLY ELAPSED TIME THE
THERMOSTAT MAY BE SET TO OPERATE THE
COMPRESSOR.
5. EXCEPT AS REQUIRED FOR SAFETY WHILE
SERVICING — DO NOT OPEN SYSTEM
DISCONNECT SWITCH.
7961-061
FIGURE 8
season, and thus eliminating pressure equalization noise
except during defrost, are to be used. On "Auto" option a
circuit is completed from R-W1 and R-Y on each heating
"on" cycle, energizing reversing valve solenoid and pulling
in compressor contactor starting compressor and outdoor
motor. R-G also make starting indoor blower motor. Heat
pump heating cycle now in operation. The second option
has no "Auto" changeover position, but instead energizes
the reversing valve solenoid constantly whenever the system
switch on subbase is placed in "Heat" position, the "B"
terminal being constantly energized from R. A Thermostat
demand for heat completes R-Y circuit, pulling in
compressor contactor starting compressor and outdoor
motor. R-G also make starting indoor blower motor.

Manual 2100-356
Page 13
OCCUPIED MODE
VENTILATION SEQUENCE – The ERV and indoor
blower will be continuously energized when the timer is
energized.
COOLING SEQUENCE – On a call for cooling, the
compressor of the unit is energized to provide cooling. A
call for cooling cancels dehumidification mode. Cooling
mode is only available when the timer is energized.
HEATING SEQUENCE – On a call for heating, the
compressor and reversing valve of the unit are energized to
provide heat pump heating. If the room temperature falls
below the 2nd stage heating set point backup electric heat is
energized. Heat pump heating is only available when the
timer is energized. If heating is energized any call for
dehumidification is ignored. If dehumidification is already
energized a call for 2nd stage heating is needed to cancel
dehumidification mode.
DEHUMIDIFICATION SEQUENCE – On a call for
dehumidification the compressor and three way valve of the
unit are energized to provide dehumidification.
Dehumidification mode will continue until the humidistat is
satisfied. If the room temperature falls below 1st stage
heating setpoint, electric heat will be energized by the room
thermostat and cycle to maintain room temperature. If 2nd
stage heating setpoint is reached, dehumidification is de-
energized and heat pump heating is energized. A call for
cooling cancels dehumidification mode.
UNOCCUPIED MODE
Cooling, heating, emergency heat and ventilation are
inhibited.
DEHUMIDIFICATION SEQUENCE – On a call for
dehumidification the compressor and three way valve of the
unit are energized to provide dehumidification.
Dehumidification mode will continue until the humidistat is
satisfied. If the room temperature falls below 65 degrees
and dehumidification is energized, electric heat will be
energized by the return air thermostat and cycle to maintain
room temperature.
Dehumidification mode can be deactivated during periods
when the timer is not energized by changing the connection
of the humidistat wiring in the low voltage box. The
humidistat connection to R on the low voltage terminal
block should be moved to DH.
OTHER CONTROL SEQUENCE
Any time the indoor coil temperature falls below 32 degrees
the compressor will be de-energized by the evaporator
defrost sensor until the coil temperature rises above 57
degrees.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on all units
so that the system operating pressures can be observed.
Pressure curves can be found later in the manual covering
all models on both cooling and heating cycles. It is
imperative to match the correct pressure curve to the unit by
model number.
DEFROST CYCLE
The defrost cycle is controlled by temperature and time on
the solid state heat pump control. See Figure 9.
When the outdoor temperature is in the lower 40° F
temperature range or colder, the outdoor coil temperature is
32° F or below. This coil temperature is sensed by the coil
sensor mounted near the bottom of the outdoor coil. Once
coil temperature reaches 30° F or below, the coil sends a
signal to the control logic of the heat pump control and the
defrost timer will start.
After 60 (90 or 30) minutes at 30° F or below, the heat
pump control will place the system in the defrost mode.
During the defrost mode, the refrigerant cycle switches back
to the cooling cycle, the outdoor motor stops, electric
heaters
are energized, and hot gas passing through the outdoor coil
melts any accumulated frost. When the temperature rises to
approximately 57° F, the coil sensor will send a signal to the
heat pump control which will return the system to heating
operations automatically.
If some abnormal or temporary condition such as a high
wind causes the heat pump to have a prolonged defrost
cycle, the heat pump control will restore the system to
heating operation automatically after 10 minutes.
There are three settings on the heat pump control – 30
minute, 60 minute, and 90 minute. Most models are
shipped wired on the 60 minute setting for greatest
operating economy. If special circumstances require a
change to another time, remove wire connected to terminal
60 and reconnect to desired terminal.
There is a cycle speed up jumper on the control. This can
be used to reduce the time between defrost cycle operation
without waiting for time to elapse.
There is an initial defrost (sen jmp) jumper on the control
that can be used at any outdoor ambient during the heating
cycle to simulate a 0° coil temperature. This can be used to
check defrost operation of the unit without waiting for the
outdoor ambient to fall into the defrost region.

Manual 2100-356
Page 14
FIGURE 9 – DEFROST CONTROL BOARD
MIS-1174

Manual 2100-356
Page 15
TROUBLESHOOTING
SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE
1. Turn on AC power supply to indoor and outdoor units.
2. Turn thermostat blower switch to “fan on” – the indoor
blower should start. (If it doesn’t, troubleshoot indoor
unit and correct problem.)
3. Turn thermostat blower switch to “auto” position.
Indoor blower should stop (after time delay).
4. Set system switch to “heat” or “cool”. Adjust
thermostat to call for heat or cool – the indoor blower,
compressor and outdoor fan should start.
NOTE: If there was no power to 24 volt transformer, the
compressor and outdoor fan motor will not start
for 5 minutes. This is because of the compressor
short cycle protection.
TABLE 5
TROUBLESHOOTING
MOTPMYSSESUACELBISSOPKCEHCOTTAHWRIAPERROKCEHCOTWOH
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tuokcolrosserpmoCneewtebV42rofkcehC.1
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Manual 2100-356
Page 16
F R F R F R
-25.0
-24.0
-23.0
-22.0
-21.0
-20.0
-19.0
-18.0
-17.0
-16.0
-15.0
-14.0
-13.0
-12.0
-11.0
-10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
196871
190099
183585
177318
171289
165487
159904
154529
149355
144374
139576
134956
130506
126219
122089
118108
114272
110575
107010
103574
100260
97064
93981
91008
88139
85371
82699
80121
77632
75230
72910
70670
68507
66418
64399
62449
60565
58745
56985
55284
53640
52051
50514
49028
47590
46200
44855
43554
42295
41077
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.0
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
65.0
66.0
67.0
68.0
69.0
70.0
71.0
72.0
73.0
74.0
39898
38757
37652
36583
35548
34545
33574
32634
31723
30840
29986
29157
28355
27577
26823
26092
25383
24696
24030
23384
22758
22150
21561
20989
20435
19896
19374
18867
18375
17898
17434
16984
16547
16122
15710
15310
14921
14544
14177
13820
13474
13137
12810
12492
12183
11883
11591
11307
11031
10762
75.0
76.0
77.0
78.0
79.0
80.0
81.0
82.0
83.0
84.0
85.0
86.0
87.0
88.0
89.0
90.0
91.0
92.0
93.0
94.0
95.0
96.0
97.0
98.0
99.0
100.0
101.0
102.0
103.0
104.0
105.0
106.0
107.0
108.0
109.0
110.0
111.0
112.0
113.0
114.0
115.0
116.0
117.0
118.0
119.0
120.0
121.0
122.0
123.0
124.0
10501
10247
10000
9760
9526
9299
9077
8862
8653
8449
8250
8057
7869
7686
7507
7334
7165
7000
6840
6683
6531
6383
6239
6098
5961
5827
5697
5570
5446
5326
5208
5094
4982
4873
4767
4663
4562
4464
4367
4274
4182
4093
4006
3921
3838
3757
3678
3601
3526
3452
CHECKING TEMPERATURE SENSOR
OUTSIDE UNIT CIRCUIT.
1. Disconnect temperature sensor from outdoor coil.
2. Use an ohmmeter and measure the resistance of the
sensor. Also use ohmmeter to check for short or open.
3. Check resistance reading to chart of resistance use
ambient temperature. (Tolerance of part is ± 10%.)
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the heat
pump control.
5. If sensor is out of tolerance, shorted, open or reads very
low ohms then it should be replaced
TEMPERATURE F VS RESISTANCE R OF TEMPERATURE SENSOR

Manual 2100-356
Page 17
FAN BLADE SETTING DIMENSIONS
Shown in the drawing below are the correct fan blade
setting dimensions for proper air delivery across the outdoor
coil.
Any service work requiring removal or adjustment in the fan
and/or motor area will require that the dimensions below be
check and blade adjusted in or out on the motor shaft
accordingly.
REMOVAL OF THE FAN SHROUD
1. Disconnect all power to unit.
2. Remove the screws holding both grilles, one on each
side of unit, and remove grilles.
3. Remove screws (9) holding fan shroud to condenser and
bottom.
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.
REFRIGERANT CHARGE
The correct system R-22 charge is shown on the unit rating
plate. Optimum unit performance will occur with a
refrigerant charge resulting in a suction line temperature
(6” from compressor) as shown in Table 7.
FIGURE 10
The above suction line temperatures are based upon 80° F
dry bulb/67° F wet bulb (50% R.H.) temperature and rated
airflow across the evaporator during cooling cycle.
TABLE 6
ledoMAnoisnemiD
D142HW00.1
MIS-1190
TABLE 7(Temperatures °F)
ledoM detaR wolfriA DO59 erutarepmeT DO28 erutarepmeT
D142HW00895-7576-56
TABLE 8
INDOOR BLOWER PERFORMANCE
CFM @ 230V
.P.S.E HnI
2
OD142HW
yrDteW
0.1.2.3.4.5.6. 0201 069 568 028 537 516 --- 579 509 008 537 056 535 ---
TABLE 9
RATED CFM AND ESP
*Rated CFM and ESP on high speed tap.
ledoM detaR *MFC detaR *PSE dednemmoceR egnaRwolfriA
D142HW00802.059007
ledoMPSE
D142HW 00A 40A 80A
05. 05. 04.
D142HW 00B 60B 05. 05.
D142HW 00C 60C 05. 05.
Values shown are for units equipped with
standard throwaway filter or 1” washable
filter. Derate ESP by .15 for 2” pleated filter.
TABLE 10
MAXIMUM ESP OF OPERATION

Manual 2100-356
Page 18
TABLE 11
PRESSURE TABLE
ledoM riAnruteR erutarepmeTerusserP5708580959001501011511
D142HW
BD.ged57 BW.ged26 ediSwoL ediShgiH 57612 67922 77242 97652 08172 18682 38203 48813 68633
BD.ged08 BW.ged76 ediSwoL ediShgiH 08122 18532 38842 48362 58872 78392 88013 09723 29443
BD.ged58 BW.ged27 ediSwoL ediShgiH 68922 88342 98752 09272 29882 39403 59123 79833 99653
COOLING Air Temperature Entering Outdoor Coil °F
Low Side Pressure ± 2 PSIG
High Side Pressure ± 5 PSIG
Tables are based upon rated CFM (airflow) across the evaporator coil and should be found under section titled
“Refrigerant Charge” elsewhere in manual. If there is any doubt as to correct operation charge being in the system, the
charge should be removed, system evacuated, and recharged to serial plate instructions.
ledoM riAnruteR erutarepmeTerusserP0501517102520353045474055506
D142HW07ediSwoL ediShgiH 03851 03851 13951 23261 33461 43761 73571 14481 54591 05802 65322 95032 36142 17062 97182
TABLE 12
PRESSURE TABLE
Air Temperature Entering Outdoor Coil °F
HEATING
Pressures in dehumidification mode will be slightly less than normal cooloing mode.