Bard WL302 User manual

© Copyright2002
Manual No.: 2100-405
Supersedes:
File: Volume III, Tab 16
Date: 04-01-02
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914...Moving ahead, just as planned.
Model: WL302
WL372
WALL MOUNTED PACKAGED
AIR CONDITIONER
INSTALLATION
INSTRUCTIONS
MIS-861

CONTENTS
i
Figures
Figure 1 Unit Dimensions..................................... 3
Figure 2 Blower Damper Assembly..................... 5
Figure 3 Mounting Instructions............................. 8
Figure 4 Wall-Mounting Instructions ................... 9
Figure 5 Wall-Mounting Instructions .................. 9
Figure 6 Common Wall-Mounting Installations .. 10
Figure 7 Electric Heat Clearances ......................11
Figure 8 Low Voltage Wiring.............................. 12
Figure 9 Fan Blade Setting ............................ 15
Tables
Table 1 Electrical Specifications ......................... 2
Table 2 Dimensions of Basic Unit....................... 3
Table 3 Electric Heat Table................................. 4
Table 4 Operating Voltage Range ...................... 7
Table 5 Thermostat Wire Size ............................ 7
Table 6 Wall Thermostat and
Subbase Combinations.......................... 7
Table 7 Fan Blade Dimensions......................... 15
Table 8 Suction Line Temperatures .................. 15
Table 9 Indoor Blower Performance ................. 15
Table 10 CFM and ESP ...................................... 15
Table 11 Maximum ESP of Operation
Electric Heat Only ................................ 15
Table 12 Cooling Pressure ................................. 16
Table 13 Optional Accessories ........................... 16
Getting Other Information and Publications
For more information,
contact these publishers ......................................... 1
Wall Mount General Information
Air Conditioner Wall Mount Model Nomenclature... 2
Shipping Damage ................................................... 4
General ................................................................... 4
Duct Work............................................................... 5
Filters ...................................................................... 5
Fresh Air Intake ...................................................... 5
Condensate Drain................................................... 5
Installation Instructions
Wall Mounting Information ...................................... 6
Mounting the Unit.................................................... 6
Wiring — Main Power ............................................. 6
Wiring — Low Voltage Wiring ................................. 6
Start Up
Important Installer Note ........................................ 13
High Pressure Switch ........................................... 13
Three Phase Scroll Compressor Start Up Info ..... 13
Phase Monitor....................................................... 13
Service Hints......................................................... 13
Sequence of Operation......................................... 13
Compressor Control Module ................................. 14
Adjustments .......................................................... 14
Pressure Service Ports ......................................... 14
Troubleshooting
Fan Blade Setting Dimensions ............................. 15
Removal of Fan Shroud........................................ 15
Refrigerant Charge ............................................... 15
Cooling Pressure Table......................................... 16
Optional Accessories ............................................ 16

Manual 2100-405
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 AirConditioning Contractorsof America
1712 New Hampshire Avenue NW
Washington, DC 20009
Telephone: [phone]
Fax: [phone]
ANSI AmericanNationalStandardsInstitute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE AmericanSociety ofHeating, Refrigerating,
andAir ConditioningEngineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA NationalFireProtection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]
Manufactured under the following U.S. patent numbers:
5,485,878; 5,301,744; 5,002,116; 4,924,934; 4,875,520;
4,825,936; 4,432,409

Manual 2100-405
Page 2
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.
WL 37 2 —A 10 X X X X X J
VENTILATIONOPTIONS
X - BarometricFreshAirDamper
(Standard)
B - Blank-offPlate
M - MotorizedFreshAirDamper
V - CommercialRoomVentilator-
MotorizedwithExhaust
E - Economizer(Internal)-Fully
ModulatingwithExhaust
R - EnergyRecoveryVentilator-
withExhaust
MODELNUMBER
CAPACITY
24 - 2 Ton
36 - 3 Ton
48 - 4 Ton
60 - 5 Ton
REVISIONS
KW
FILTEROPTIONS
X - OneInchThrowaway(Standard)
W- OneInchWashable
P - TwoInchPleated
COLOROPTIONS
X - Beige(Standard)
1 - White
2 - MesaTan
4 - BuckeyeGray
5 - DesertBrown
6 - DarkBronze
CONTROLMODULES
J - StandardOnAllModels
OUTLETOPTIONS
X- Front(Standard)
VOLTS&PHASE
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
COILOPTIONS
X- Standard
1 - PhenolicCoatedEvaporator
2 - PhenolicCoatedCondenser
3 - PhenolicCoatedEvaporator
andCondenser
WALL MOUNT GENERAL INFORMATION
AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE
j
k
l
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 the National Electrical Code 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 filed poser conductor 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
conductors are in a raceway.
TABLE 1
ELECTRICALSPECIFICATIONS
sledoM
detaR
/stloV
sesahP
.oN
dleiF
rewoP
stiucriC
3
muminiM
tiucriC
yticapmA
1
mumixaM
lanretxE
roesuF
.tkC
rekaerB
2
dleiF
rewoP
eriW
eziS
2
dnuorG
eriW
eziS
3
muminiM
tiucriC
yticapmA
1
mumixaM
lanretxE
esuF
.tkCro
rekaerB
2
dleiF
eriWrewoP
eziS
2
dnuorG
eziSeriW
TKC
A
TKC
B
TKC
A
TKC
B
TKC
A
TKC
B
TKC
A
TKC
B
Z0A-203LW
50A
01A
51A
1-802/032
1
1
1
2ro1
42
13
75
38
53
53
06
09
8
8
6
4
01
01
01
8
AN
AN
AN
55
AN
AN
AN
62
AN
AN
AN
06
AN
AN
AN
03
AN
AN
AN
4
AN
AN
AN
01
AN
AN
AN
8
AN
AN
AN
01
Z0B-203LW
90B
51B
3-802/032
1
1
1
71
23
05
02
53
05
21
8
8
21
01
01
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
Z0C-203LW
90C
51C
3-064
1
1
1
01
71
62
51
02
03
41
21
01
41
21
01
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
Z0A-273LW
50A
01A
51A
1-802/032
1
1
1
2ro1
82
23
85
48
53
53
06
09
8
8
6
4
01
01
01
8
AN
AN
AN
85
AN
AN
AN
62
AN
AN
AN
06
AN
AN
AN
03
AN
AN
AN
6
AN
AN
AN
01
AN
AN
AN
01
AN
AN
AN
01
Z0B-273LW
90B
51B
3-802/032
1
1
1
02
33
15
52
53
06
01
8
6
01
01
01
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
Z0C-273LW
90C
51C
3-064
1
1
1
11
71
62
51
02
03
41
21
01
41
21
01
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN
AN

Manual 2100-405 Page 3
FIGURE 1
UNIT DIMENSIONS
MIS-1268
TABLE 2
DIMENSIONS OF BASIC UNIT (NOMINAL) (IN INCHES)
ledoM
htdiW
)W(
htpeD
)D(
thgieH
)H(
ylppuSnruteR
EFG I JKLMNOPQRSTABCB
203LW
173LW 02.83521.71365.0788.788.7288.3188.7200.0405.8157.5239.7157.6257.8252.9200.7257.291.9357.2241.991.400.2100.5
FRONTVIEWLEFTSIDEVIEWBACKVIEW

Manual 2100-405
Page 4
SHIPPINGDAMAGE
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 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 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 1 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.
TABLE 3
ELECTRIC HEAT TABLE
sledoM A-203LW
A-273LW
B-203LW
B-273LW
C-203LW
C-273LW
WK
1-V0421-V8023-V0423-V8023-V064
SPMAHUTBSPMAHUTBSPMAHUTBSPMAHUTBSPMAHUTB
0.58.02560,711.81008,21------------------
0.016.14031,432.63006,52------------------
0.515.26002,151.45004,83------------------
0.9------------7.12006,037.81030,328.01007,03
0.51------------2.63002,152.13004,830.81002,15

Manual 2100-405
Page 5
FRESH AIR INTAKE
All units are built with fresh air inlet slots punched in
the service panel.
If the unit is equipped with the 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 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.
CONDENSATEDRAIN
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.
MIS-938
A 1/4 inch clearance to combustible material for the
first 3 feet of duct attached to the outlet air frame is
required. See Wall Mounting Instructions and Figures 3
and 7 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.
Any grille that meets the 5/8 inch louver criteria, may
be used. It is recommended that Bard Return Air Grille
Kit RG-2 thru RG-5 or RFG-2 thru RFG-5 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 2 inch
pleated filter are also available as optional accessories.
The internal filter brackets are adjustable to
accommodate the 2 inch filter by bending the metal tabs
holding the 1 inch filter down. There are two tabs on
each side of the filter.
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.
FIGURE 2
FRESH AIR DAMPER ASSEMBLY
BLADE IS LOCKED
CLOSED FOR
SHIPPING

Manual 2100-405
Page 6
WALL MOUNTING INFORMATION
1. Two holes, for the supply and return air openings,
must be cut through the wall as shown in Figure 3.
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.
WARNING
Fire hazard can result if 1/4 inch clearance to
combustible materials for supply air duct is not
maintained. See Figure 3.
3. Concrete block walls must be thoroughly inspected to
insure that they are capable of carrying the weight of
the installing 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 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. If a combustible
wall, use a minimum of 28-1/2" x 8-1/2" dimensions
for sizing. However, it is generally recommended that
a 1 inch clearance is used for ease of installation and
maintaining the required clearance to combustible
material. The supply air opening would then be 30" x
10". See Figures 3 and 7 for details.
WARNING
Failure to provide the 1/4 inch clearance
between the supply duct and a combustible
surface for the first 3 feet can result in fire.
3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figure 3.
4. Mount bottom mounting bracket.
5. Hook top rain flashing under back bend of top. Top
rain flashing is shipped secured to the right side of
the back.
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 3.
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 left side to allow access to
heat strips and control panel and to allow proper
airflow to the outdoor coil. Additional clearance may
be required to meet local or national codes.
WIRING – MAINPOWER
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 (75ºC
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 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.

Manual 2100-405
Page 7
WIRING – LOW VOLTAGEWIRING
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 240V and 208V taps are:
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).
Five (5) wires should be run from thermostat subbase to
the 24V terminal board in the unit. A five conductor, 18
gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in
Figure 8.
TABLE 4
OPERATING VOLTAGE RANGE
PATEGNAR
V042612–352
V802781–022
remrofsnarT
AVALFeguaGeriW
mumixaM
ecnatsiD
teeFnI
553.2
eguag02
eguag81
eguag61
eguag41
eguag21
54
06
001
061
052
TABLE 5
THERMOSTAT WIRE SIZE
TABLE 6
WALLTHERMOSTATANDSUBBASE COMBINATIONS
tatsomrehTesabbuSserutaeFetanimoderP
200-3048
1113F78T
300-4048
0221A935Q
loocegats1,taehegats1
no-otua:naFlooc-ffo-taeh:metsyS
140-3048
C4308T --- loocegats1,taehegats1
no-otua:naFlooc-ffo-taeh:metsyS
910-3048
0671C478T
210-4048
1001A476Q
taehegats2,loocegats1
no-otua:naFlooc-otua-taeh:metsyS
120-3048
4391D478T
210-4048
1001A476Q
taehegats2,loocegats2
no-otua:naFlooc-otua-taeh:metsyS
940-3048
083-39F1 --- taehegats2,loocegats2
lortnocnoitalitnev/wgnimmargorpyad7cinortcelE
340-3048
002-MC --- loocegats1,taehegats1
no-otua:naFlooc-ffo-taeh:metsyS

Manual 2100-405
Page 8
FIGURE 3
MOUNTINGINSTRUCTIONS
NOTE:It is recommended that a bead silicone
caulking be placed behind the side
mounting flanges and under the top
flashing at the time of installation.
MIS-859
TOP
SEAL WITH BEAD OF
CHALKING ALONG
ENTIRE LENGTH OF TOP
RAIN FLASHING
SUPPLIED
FOAM AIR SEAL
SUPPLY AIR
DUCT
1/4" CLEARANCE ON
ALL FOUR SIDES OF
SUPPLY AIR DUCT IS
REQUIRED FROM
COMBUSTIBLE
MATERIALS
WALL STRUCTURE
HEATER ACCESS
PANEL
RETURN
AIR
OPENING
4 9/16

Manual 2100-405
Page 9
MIS-948
FIGURE 4
WALL MOUNTING INSTRUCTIONS
FIGURE 5
WALL MOUNTING INSTRUCTIONS
SEE UNIT DIMENSIONS
FIGURE 1 FOR ACTUAL
DIMENSIONS
MIS-1051
SEE FIGURE 3 –MOUNTING INSTRUCTIONS FOR OPENING SIZES

Manual 2100-405
Page 10
FIGURE 6
COMMONWALL MOUNTING INSTALLATIONS
MIS-1050

Manual 2100-405
Page 11
FIGURE 7
ELECTRICHEATCLEARANCE
Side section view of supply air duct for
wall mounted unit showing 1/4 inch
clearance to combustible surfaces.
MIS-277
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 fire.

Manual 2100-405
Page 12
FIGURE 8
LOW VOLTAGE WIRING
MIS-1373C

Manual 2100-405
Page 13
IMPORTANT INSTALLER NOTE
For improved start-up performance, wash the indoor
coil with a dishwasher detergent.
HIGH PRESSURE SWITCH
The WL371 models are supplied with a remote reset
high pressure switch. If tripped, this pressure switch
may be reset by turning the thermostat off then back on
again.
THREE PHASE SCROLL COMPRESSOR
START UP INFORMATION
Scroll compressors, like several other types of
compressors, will only compress in one rotational
direction. Direction of rotation is not an issue with
single phase compressors since they will always start
and run in the proper direction.
However, three phase compressors will rotate in either
direction depending upon phasing of the power. Since
there is a 50-50 chance of connecting power in such a
way as to cause rotation in the reverse direction,
verification of proper rotation must be made. All three
phase units incorporate a phase monitor to ensure proper
field wiring. See the Phase Monitor section later in this
manual.
Verification of proper rotation must be made any time
a compressor is change or rewired. If improper rotation
is corrected at this time there will be no negative impact
on the durability of the compressor. However, reverse
operation for over one hour may have a negative impact
on the bearing due to oil pump out.
NOTE: If compressor is allowed to run in reverse
rotation for several minutes, the compressor's
internal protector will trip.
All three phase ZR3 compressors are wired identical
internally. As a result, once the correct phasing is
determined for a specific system or installation,
connecting properly phased power leads to the same
Fusite terminal should maintain proper rotation
direction.
Verification of proper rotation direction is made by
observing that suction pressure drops and discharge
pressure rises when the compressor is energized.
Reverse rotation also results in an elevated sound level
over that with correct rotations, as well as, substantially
reduced current draw compared to tabulated values.
The direction of rotation of the compressor may be
changed by reversing any two line connections to the
unit.
START UP
PHASE MONITOR
All units with three phase compressors are equipped
with a 3 phase line monitor to prevent compressor
damage due to phase reversal.
The phase monitor in this unit is equipped with two
LEDs. If the Y signal is present at the phase monitor
and phases are correct the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
If a fault condition occurs, reverse two of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
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. On all 230 volt
units there is a one minute off delay on the blower
motor. 460 volt models do not have an off delay. 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.

Manual 2100-405
Page 14
AlarmRelayOutput
Alarm terminal is output connection for applications
where alarm relay is employed. This terminal is
powered whenever 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 or heat pump unit model. The
lockout features, both soft and manual, are a
function of the Compressor Control Module.
ADJUSTMENTS
AdjustableDelayon Make andDelayon 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.
TypicalSettingsforDualUnitInstallation:
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 and low pressure service ports are installed on all
units so that the system operating pressures can be
observed. Pressure tables 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.
COMPRESSOR CONTROL MODULE
The compressor control module is optional on the
models covered by this manual. The compressor
control is an anti-short cycle/lockout timer with high
and low pressure switch monitoring and alarm relay
output.
AdjustableDelayon Make andBreak Timer
On initial power up or any time 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 if employed)
is closed, the compressor contactor is energized. Upon
shutdown the delay or 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.
HighPressureSwitchandLockoutSequence
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
make 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.
LowPressureSwitch,Bypass, andLockout
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.

Manual 2100-405
Page 15
TROUBLESHOOTING
The suction line temperatures in Table 8 are based upon
80ºF dry bulb/67ºF wet bulb (50 percent R.H.)
temperature and rated airflow across the evaporator
during cooling cycle.
FAN BLADE SETTING DIMENSIONS
Shown in the drawing below is the correct fan blade
setting dimension 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 dimension
below be checked and blade adjusted in or out on the
motor shaft accordingly.
REMOVAL OF FAN SHROUD
1. Disconnect all power to unit.
2. Remove the screws holding both grills – one on each
side of unit – and remove grills.
3. Remove screws holding fan shroud to condenser and
bottom – 9 screws.
4. Un-wire 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.
REFRIGERANTCHARGE
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 inches from compressor) as shown in the
following table:
"A"
AIRFLOW
TABLE 8
SUCTION LINE TEMPERATURES
sledoM
detaR
wolfriA
F°59
.pmeTDO
F°28
.pmeTDO
203LW000,195–6566–46
273LW001,195–7546–26
TABLE 11
MAXIMUM ESP OF OPERATION
ELECTRIC HEAT ONLY
Values shown are for units equipped with Standard 1
inch throwaway filter or 1 inch washable filter. Derate
ESP by .15 for 2 inch pleated filter.
ledoMteltuOtnorF
WKdeepSwoLdeepShgiH
Z0A
50A
01A
51A
05.
05.
54.
53.
05.
05.
05.
04.
Z0B
90B
51B
05.
05.
03.
05.
05.
54.
Z0C
90C
51C
05.
04.
53.
05.
05.
54.
Q Rated CFM and ESP on high speed tap
TABLE 10
CFM AND ESP
ledoM
1
detaR
MFC
1
detaR
PSE
dednemmoceR
egnaRwolfriA
203LW 000,104.003,1– 039
173LW 001,103.053,1–039
TABLE 9
INDOORBLOWERPERFORMANCE – CFM
AT 230 VOLTS
.P.S.E
HnI
2
O
273LW,203LW
deepShgiHdeepSwoL
lioCyrDlioCteWlioCyrDlioCteW
0.593,1513,1059539
1.043,1072,1039519
2.582,1091,1019588
3.502,1001,1558038
4.011,1000,1008557
5.500,1078------
FIGURE 9
FAN BLADE SETTING
TABLE 7
FANBLADE DIMENSIONS
ledoMAnoisnemiD
203LW
273LW 52.1

Manual 2100-405
Page 16
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 charge
being in the system, the charge should be removed, system evacuated and recharged to serial
plate instructions.
TABLE 12
COOLING PRESSURE – OUTDOOR TEMPERATURE °F
ledoM
riAnruteR
erutarepmeTerusserP5708580959001501011511
203LW
BDged57
BWged26
ediSwoL
ediShgiH
57
512
67
922
87
442
97
852
08
572
18
292
38
803
48
723
58
543
BDged08
BWged76
ediSwoL
ediShgiH
08
022
18
532
38
052
58
562
68
282
78
992
98
613
09
533
19
453
BDged58
BWged27
ediSwoL
ediShgiH
38
822
48
342
68
952
88
472
98
292
09
903
29
723
39
743
49
663
273LW
BDged57
BWged26
ediSwoL
ediShgiH
96
002
07
412
27
922
47
542
57
162
77
972
87
692
97
613
97
533
BDged08
BWged76
ediSwoL
ediShgiH
57
502
57
912
77
532
97
152
08
862
28
682
38
403
48
423
58
443
BDged58
BWged27
ediSwoL
ediShgiH
77
212
87
722
08
342
28
062
38
772
58
892
68
513
78
533
88
853
TABLE 13
OPTIONALACCESSORIES
WL302-A WL371-A
WL302-B WL371-B WL302-C WL371-C
LEDOMNOITPIRCSED
3-POBetalPffOknalB XXX
3-DAFBrepmaDriAhserFcirtemoraB XXX
3-DAFMrepmaDriAhserFdezirotoM XXX
3-VRCtsuahxEhtiwrotalitneVlaicremmoC XXX
B3-MFIEtsuahxEhtiwrezimonocE XXX
51-CMCtiKtratSX