Bard WL421 User manual

INSTALLATION INSTRUCTIONS
WALL MOUNTED
PACKAGE AIR CONDITIONERS
MODELS
WL421
WL482
WL602
Manual : 2100-277C
Supersedes: 2100-277B
File: Volume III Tab 16
Date: 09-20-01
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914...Moving ahead just as planned.

Contents
Figures
Figure 1 Unit Dimensions...................................... 3
Figure 2 Fresh Air Damper Assembly ................... 6
Figure 3 Mounting Instructions.............................. 8
Figure 4 Electric Heat Clearance .......................... 9
Figure 5 Wall Mounting Instructions.................... 10
Figure 5 Wall Mounting Instructions.................... 10
Figure 7 Common Wall Mounting Installations.....11
Figure 8 Unit 24V Terminal Board ....................... 13
Figure 9 Starting Procedure ................................ 14
Figure 10 Fan Blade Setting ................................. 17
Tables
Table 1 Electric Heat Table .................................. 2
Table 2 Electrical Specifications .......................... 4
Table 3 Thermostat Wire Size ........................... 12
Table 4 Wall thermostat and Subbase
Combinations ........................................ 12
Table 5 Fan Blade Dimensions.......................... 17
Table 6 Refrigerant Charge ............................... 17
Table 7 Indoor Blower Performance .................. 17
Table 8 Recommended Air Flow........................ 18
Table 9 Maximum EXP Electric Heat Only........ 18
Table 10 Pressure Table ...................................... 18
Table 11 Optional Accessories ............................ 19
Getting Other Information and Publications .......... 1
Wall Mount General Information ............................. 2
Heat Pump Wall Mount Model Nomenclature.......... 2
Shipping Damage .................................................... 5
General ................................................................ 5
Duct Work................................................................ 5
Filters ................................................................ 6
Fresh Air Intake ....................................................... 6
Condensate Drain.................................................... 6
Installation Instructions ........................................... 7
Wall Mounting Information....................................... 7
Mounting the Unit .................................................... 7
Wiring – Main Power ............................................. 12
Wiring – Low Voltage Wiring ................................. 12
Start Up ................................................................... 14
Important Installer Note ......................................... 14
Crankcase Heaters................................................ 14
High Pressure Switch ............................................ 14
Three Phase Scroll Compressor Start Up.............. 14
Condenser Fan Operation ..................................... 14
Service Hints ......................................................... 15
Sequence of Operation.......................................... 15
Compressor Control Module.................................. 15
Adjustments ........................................................... 16
Phase Monitor ....................................................... 16
Pressure Service Ports.......................................... 16
Troubleshooting ..................................................... 17
Fan Blade Setting Dimensions .............................. 17
Removal of Fan Shroud......................................... 17
Refrigerant Charge ................................................ 17
Pressure Table....................................................... 18
Optional Accessories ............................................. 19

Manual 2100-277
Page 3
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 2100-277
Page 4
WALL MOUNT GENERAL INFORMATION
HEAT PUMP WALL MOUNT MODEL NOMENCLATURE
WL 42 1 – A 10 X N X X X A
NOTE: All vent options are without exhaust capability. May require separate field supplied barometric relief in building.
TABLE 1
ELECTRIC HEAT TABLE
sledoM A-124LW A-284LW A-206LW
B-124LW B-284LW B-206LW C-124LW C-284LW C-206LW
1-0421-8023-0423-8023-064
WKAUTBAUTBAUTBAUTBAUTB
58.02050711.8100821
97.12006037.81030328.0100703
016.14031432.6300652
515.26002150.45004832.63002152.13004833.7100074
MODEL NUMBER CONTROL
MODULES
(See Chart Below)
VOLTS & PHASE
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
REVISIONS
KWVENTILATIONOPTIONS
X - Barometric FreshAirDamper (Standard)
B - Blank-off Plate
M - MotorizedFresh AirDamper
V - Commercial Ventilator-
MotorizedwithExhaust
E - Economizer(Internal)- Fully
ModulatingwithExhaust
R - EnergyRecovery Ventilator-
MotorizedwithExhaust
FILTEROPTIONS
X - OneInchThrowaway(Standard)
W - One Inch Washable
P - Two InchPleated
COLOROPTIONS
X - Beige(Standard)
1 - White
2 - Mesa Tan
4 - Buckeye Gray
5 - Desert Brown
6 - Dark Bronze
COILOPTIONS
X - Standard
1 - PhenolicCoated Evaporator
2 - PhenolicCoated Condenser
3 - PhenolicCoated Evaporator
andCondenser
OUTLETOPTIONS
X - Front(Standard)
CAPACITY
42 - 3 1/2 Ton
48 - 4 Ton
60 - 5 Ton

Manual 2100-277
Page 5
FIGURE 1
UNIT DIMENSIONS
MIS-1286
ledoM htdiW )W( htpeD )D( thgieH )H(
ylppuSnruteR
EFGI JKLMNOPQRSTABCB
24LW 84LW 06LW 570.24234.22578.4888.988.9288.5188.9288.3401.9166.1300.0386.2349.6296.4334.2373.388.2488.3200.0144.100.6188.1
FRONT VIEWLEFT SIDE VIEW
BACK VIEW

Manual 2100-277
Page 6
TABLE 2
ELECTRICAL SPECIFICATIONS
1Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
2Based on 75° C copper wire. All wiring must conform to NEC and all local codes.
3These “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 8 of table 310 regarding Ampacity Adjustment Factors when more than 3 conductors are in a raceway.
ledoM
TIUCRICELGNIS TIUCRICLAUD
detaR &stloV esahP dleiF rewoP stiucriC muminiM tiucriC yticapmA
mumixaM lanretxE roesuF tiucriC rekaerB
dleiF rewoP eriW eziS
dnuorG eriW eziS
muminiM tiucriC yticapmA
mumixaM esuFlanretxE rewoPdleiF eziSeriW dnuorG eziSeriW
ATKCBTKCATKCBTKCATKCBTKCATKCBTKC
Z0A,00A-124LW 50A 01A 51A
1-802/032
1
1
12ro1
33339558 05050609 8
8
6
4
010101
8
A/N A/N A/N65 A/N A/N A/N62 A/N A/N A/N06 A/N A/N A/N03 A/N A/N A/N6 A/N A/N A/N01 A/N A/N A/N01 A/N A/N A/N01
Z0B,
00B-124LW 90B 51B 3-802/032 1
1
1
424325 535305 8
8
6
010101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A
/N A/N A/N A/N A/N A/N
Z0C,00C-124LW 90C 51C 3-064 1
1
1
217162 510203 412101 412101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A
/N
A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N
Z0A,00A-284LW 50A 01A 51A
1-802/032
1
1
12ro1
83839558 05050609 8
8
6
4
010101
8
A/N A/N A/N95 A/N A/N A/N62 A/N A/N A/N06 A/N A/N A/N03 A/N A/N A/N6 A/N A/N A/N01 A/N A/N A/N01 A/N A/N A/N01
Z0B,00B-284LW 9
0B 51B 3-802/032 1 1
1
624325 535306 8
8
6
010101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/
NA/N A/N
Z0C,00C-281LW 90C 51C 3-064 1
1
1
317162 510203 412101 412101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/
N
A/N A/N A/N A/N A/N A/N A/N A/N A/N
Z0A,00A-206LW 50A 01A 51A
1-802/032
1
1
12ro1
44445558 06060609 8
8
6
4
010101
8
A/N A/N A/N9
5
A/N A/N A/N62 A/N A/N A/N06 A/N A/N A/N03 A/N A/N A/N6 A/N A/N A/N01 A/N A/N A/N01 A/N A/N A/N01
Z0B,00B-206LW 90B 51B 3-802
/032 1 1
1
234325 545406 8
8
6
010101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N
Z0C
,00C-203LW 90C 51C 3-064 1
1
1
617162 020203 212101 212101 A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N A/N
A/N A/N A/N A/N A/N A/N
ÀÀ
ÁÁÁÁ
ÂÂ

Manual 2100-277
Page 7
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 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
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 Wall Mounting Instructions and Figures 3 and 4 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
RG2 through RG5 or RFG2 through 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.

Manual 2100-277
Page 8
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.
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.
FILTERS
A one 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 one inch washable filter and two inch
pleated filter are also available as optional accessories. The
internal filter brackets are adjustable to accommodate the
two inch filter by loosening two (2) screws on each bracket
assembly and sliding the brackets apart to the required width
and retightening the four (4) screws.
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.
MIS-938
FIGURE 2
FRESH AIR DAMPER
BLADE IS LOCKED
CLOSED FOR
SHIPPING.

Manual 2100-277
Page 9
INSTALLATION INSTRUCTIONS
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.
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.
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 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 30-1/2” x 10-1/2” 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 32” x 12”. See
Figures 3 and 4 for details.
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 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.

Manual 2100-277
Page 10
FIGURE 3
MOUNTING INSTRUCTIONS
MIS-947

Manual 2100-277
Page 11
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.
FIGURE 4
ELECTRIC HEAT CLEARANCE
SIDE SECTION VIEW OF SUPPLY AIR DUCT FOR WALL
MOUNTED UNIT SHOWING 1/4 INCH CLEARANCE TO
COMBUSTIBLE SURFACES.
MIS-277

Manual 2100-277
Page 12
FIGURE 5
WALL MOUNTING INSTRUCTIONS
FIGURE 6
WALL MOUNTING INSTRUCTIONS
MIS-1051
SEEFIGURE 3 –MOUNTING INSTRUCTIONS
SUPPLY AIR
DUCT
RETURN AIR
OPENING RETURN AIR
OPENING
SUPPLY AIR
OPENING
BOTTOM MOUNTING
BRACKET. MOUNT ON
WALL BEFORE
INSTALLING UNIT.
RETURN
AIR
OPENING
SUPPLY AIR
OPENING
WALL STRUCTURE
FACTORY SUPPLIED RAIN
FLASHING. MOUNT ON UNIT
BEFORE INSTALLATION
SEE UNIT DIMENSIONS, FIGURE
1, FOR ACTUAL DIMENSIONS
ATTACH TO TOP
PLATE OF WALL
1.000” CLEARANCE
ALL AROUND
1.000” CLEARANCE
ALL AROUND
EXTERIOR FINISHED WALL
OVER FRAME
ATTACH TO BOTTOM
PLATE OF WALL
FRAMING MATERIAL
2 X 4’S, 2 X 6’S AND/OR
STRUCTURAL STEEL THIS STRUCTURAL MEMBER LOCATED TO MATCH
STUD SPACING FOR REST OF WALL. A SECOND
MEMBER MAY BE REQUIRED FOR SOME WALLS.
RETURN DUCT
OPENING
SUPPLY DUCT
OPENING
MIS-948
INTERIOR FINISHED
WALL OVER FRAME

Manual 2100-277
Page 13
FIGURE 7
COMMON WALL MOUNTING INSTALLATIONS
FREE AIR FLOW NO DUCT DUCTED SUPPLY RETURN AT UNIT
FALSE WALL INSTALLATION CLOSET INSTALLATION
MIS-1050

Manual 2100-277
Page 14
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
muse 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
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.
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:
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).
TABLE 3
THERMOSTAT WIRE SIZE
remrofsnarT AVALFeguaGeriW
mumixaM
teeFnI
553.2
eguag02 eguag81 eguag61 egaug41 egaug21 5406 001 061 052
TABLE 4
WALL THERMOSTAT AND SUBBASE 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
530-3048 08-59F1 ---taehegats2,loocegats2 gnimmargorpyad7cinortcelE
340-3048 002-MC --- loocegats1,taehegats1 no-otua:naFlooc-ffo-taeh:metsyS

Manual 2100-277
Page 15
FIGURE 8
UNIT 24V TERMINAL BOARD
MIS-1373

Manual 2100-277
Page 16
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. 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 rotation, as well as,
substantially reduced current draw compared to tabulated
values.
Verification of proper rotation must be made at the time
the equipment is put into service. 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 identically
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.
The direction of rotation of the compressor may be changed
by reversing any two line connections to the unit.
CONDENSER FAN 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.
50 HZ models must have fan wired on low speed. These
models are factory wired on low speed.
START UP
IMPORTANT INSTALLER NOTE
For improved start up performance wash the indoor coil
with a dish washing detergent.
CRANKCASE HEATERS
WL421 units are provided with compressor crankcase heat.
WL602 and WL482 units are not provided with crankcase
heat. These units utilize scroll compressors which do not
require crankcase heat in this application.
The WL421 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 maintani the compressor at a safe termperature on
these units.
Some form of crankcase heat is essential to prevent liquid
refrigerant from migating to the compressor causing oil
pump out on compressor start up and possible valve failure
due to compressing a liquid.
The decal in Figure 9 is affixed to all WL421 units detailing
start up procedure. This is very important. Please read
carefully.
HIGH PRESSURE SWITCH
The WL482 and WL602 models are supplied with a remote
reset high pressure switch. If tripped, this pressure switch
may be reset by turning the themostat off then back on
again.
FIGURE 9
STARTING PROCEDURE
IMPORTANT
THESEPROCEDURES MUSTBEFOLLOWEDAT
INITIALSTARTUPANDATANYTIME 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 crankcase.
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
crankcase.
3. Allow 4 hours or 60 minutes per pound of
refrigerant in the system as noted on the unit
rating plate, which ever 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

Manual 2100-277
Page 17
Low Pressure Switch, Bypass, and 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 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.
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. Check all power fuses or circuit breakers to be sure they
are the correct rating.
4. 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 of 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.
COMPRESSOR CONTROL MODULE
The compressor control module is standard on the WL482
and WL602 models covered by this manual and is optional
on the WL421 model. The compressor control 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 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.
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.

Manual 2100-277
Page 18
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 No. 1: DOB set at 2 minutes, and DOM is 132
seconds
Unit No. 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. 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.
PHASE MONITOR
All units with three phase scroll 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.

Manual 2100-277
Page 19
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.
FIGURE 10
TROUBLESHOOTING
The suction line temperatures in table above are based upon
80° F dry bulb / 67° F wet bulb (50% R.H.) temperature and
rated airflow across the evaporator during cooling cycle.
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 6.
TABLE 5
ledoM noisnemiD A
124LW 284LW 206LW 57.1
TABLE 6
REFRIGERANT CHARGE
ledoM detaR wolfriA DO59 erutarepmeT DO28 erutarepmeT
124LW004145-2566-46
284LW055165-4576-56
206LW007155-3526-06
TABLE 7
INDOOR BLOWER PERFORMANCE
CFM @230V
.P.S.E HnI
2
0
284LW,124LW206LW
V032woLV032hgiHV032woLV032hgiH
lioCyrDlioCteWlioCyrDlioCteWlioCyrDlioCteWlioCyrDlioCteW
0.1.2.3.4.5. 0561 0551 0541 0531 0031 --- 0061 0051 0041 0031 5711 --- 5881 0771 5361 0051 0731 0521 0081 5661 0451 0041 5821 0511 0061 5251 0541 5731 0022 0012 0002 5781 5771 0561 0002 0091 0081 0071 0061 5741
FAN BLADE SETTING DIMENSIONS
Shown in Figure 10 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 dimensions
below be checked and blade adjusted in or out on the motor
shaft accordingly.

Manual 2100-277
Page 20
TABLE 8
RECOMMENDED AIRFLOW
* Rated CFM and ESP on high speed tap.
ledoM detaR *MFC detaR *PSE dednemmoceR egnaRwolfriA
124LW004103.0511-0061
284LW055102.5821-0571
206LW007103.5731-0591
TABLE 9
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 filters.
ledoM124LW284LW206LW
WK hgiH deepS woL deepS hgiH deepS woL deepS hgiH deepS woL deepS
50A- 01A- 51A- 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05.
00B- 90B- 51B- 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05.
90C- 51C- 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05. 05.
Low side pressure ± 2 PSIG
High side pressure ± 5 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 instructions.
NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear
elevated check condenser fan wiring. See “Condenser Fan Operation” on Page 14.
TABLE 10
PRESSURE TABLE
COOLING
Air Temperature Entering Outdoor Coil °F
ledoM riAnruteR erutarepmeTerusserP5708580959001501011511
124LW
BD.ged57 BW.ged26 ediSwoL ediShgiH 86312 17822 47342 67952 87472 08092 18503 38123 48733
BD.ged08 BW.ged76 ediSwoL ediShgiH 27812 67432 97942 28562 48182 68792 88313 98033 09643
BD.ged58 BW.ged27 ediSwoL ediShgiH 87622 28242 58852 88472 09092 29703 49323 69143 79853
284LW
BD.ged57 BW.ged26 ediSwoL ediShgiH 37402 47712 67232 87842 97562 08482 28403 38523 48843
BD.ged08 BW.ged76 ediSwoL ediShgiH 87012 97322 18832 28452 48272 68192 78213 98433 09753
BD.ged58 BW.ged27 ediSwoL ediShgiH 48712 58132 78742 88462 09282 29203 39323 59543 79963
206LW
BD.ged57 BW.ged26 ediSwoL ediShgiH 17332 27742 47262 57872 67592 77313 87133 87153 97173
BD.ged08 BW.ged76 ediSwoL ediShgiH 67732 87352 97962 08582 18303 28123 38043 48093 58183
BD.ged58 BW.ged27 ediSwoL ediShgiH 48542 58162 58872 68692 78413 88333 98353 09373 19493