WALL MOUNTED PACKAGED
INSTALLATION AIR CONDITIONER
INSTRUCTIONS Model: WL701-B, WL701-C,
WL702-A
MIS-861
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914...Moving ahead just as planned.
Manual No.:
Supersedes:
File:
Date:
2100-426
Volume III, Tab 16
01-01-03
© Copyright 2003
CONTENTS
Getting Other Information and Publications
For more information, contact these publishers: ..... 1
Wall Mount General Information
Air Conditioner Wall Mount Model Nomenclature ....
Shipping Damage ....................................................
General
...............................................................
Duct Work ...............................................................
Filters
...............................................................
Fresh Air Intake ........................................................
Condensate Drain ....................................................
2
4
4
4
5
5
5
Installation Instructions
Wall Mounting Information .......................................
Mounting the Unit .....................................................
Typical Installations ..................................................
Wiring – Main Power ..............................................
Wiring – Low Voltage Wiring ..................................
6
6
6
6
7
Troubleshooting
Fan Blade Setting Dimensions ..............................
Removal of Fan Shroud .........................................
Refrigerant Charge ................................................
Pressure Chart ......................................................
Optional Accessories .............................................
Unit Dimensions ..................................... 3
Blower Damper Assembly ...................... 5
Mounting Instructions ............................. 7
Electric Heat Clearances ....................... 8
Wall-Mounting Instructions .................... 9
Wall-Mounting Instructions .................... 9
Common Wall-Mounting Instructions ... 10
Low Voltage Wiring ............................... 11
Start-Up Label ...................................... 12
Fan Blade Setting ................................ 15
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
i
12
12
12
12
13
13
13
14
14
14
15
15
15
16
16
Tables
Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Start Up
Important Installer Note .........................................
Crankcase Heaters ................................................
High Pressure Switch .............................................
Three Phase Scroll Compressor Start Up
Information .............................................................
Service Hints .........................................................
Sequence of Operation ..........................................
Compressor Control Module ..................................
Adjustments ...........................................................
Phase Monitor .......................................................
Pressure Service Ports ..........................................
Electrical Specifications ......................... 2
Dimensions of Basic Unit ....................... 3
Electric Heat Table ................................. 3
Operating Voltage Range ....................... 7
Thermostat Wire Size ............................ 8
Wall Thermostat and
Subbase Combinations .......................... 8
Fan Blade Dimensions ......................... 15
Suction Line Temperatures .................. 15
Indoor Blower Performance ................. 15
CFM and ESP ...................................... 15
Maximum ESP of Operation
Electric Heat Only ................................ 15
Cooling Pressure ................................. 16
Optional Accessories ........................... 16
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.
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA
Air Conditioning Contractors of America
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI
American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
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 or
Residential Winter and
Manual N
Summer Air Conditioning
Low Pressure, Low Velocity Duct . ACCA Manual D or
System Design for Winter and
Manual
Q
Summer Air Conditioning
ASHRAE American Society of Heating Refrigerating,
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400
Fax: (404) 321-5478
NFPA
National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: (800) 344-3555
Fax: (617) 984-7057
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
Manual 2100-426
Page 1
WALL MOUNT GENERAL INFORMATION
AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE
MODEL NUMBER
WL
CAPACITY
70 - 6 Ton
70
1 – B
09
X
X
X
X
X
J
CONTROL MODULES
J - Standard on all
Models
COIL OPTIONS
X - Standard
1 - Phenolic Coated Evaporator
2 - Phenolic Coated Condenser
3 - Phenolic Coated Evaporator
and Condenser
COLOR OPTIONS
X - Beige
(Standard)
OUTLET OPTIONS
1 - White
X - Front (Standard)
REVISION
VENTILATION OPTIONS
X - Barometric Fresh Air Damper
(Standard)
VOLTS & PHASE
B - Blank-off Plate
A - 230/208-1
KW
M - Motorized Fresh Air Damper
B - 230/208/60-3 00 - No KW
V - Commercial Room Ventilator C - 460/60-3
0Z - No KW
Motorized with Exhaust
w/Circuit Breaker
E - Economizer (Internal) - Fully
or Pull
Modulating with Exhaust
Disconnect
R - Energy Recovery Ventilator 05 - 5 KW
with Exhaust
FILTER OPTIONS
09 - 9 KW
X - One Inch Throwaway
10 - 10 KW
(Standard)
15 - 15 KW
W - One Inch Washable
18 - 18 KW
P - Two Inch Pleated
NOTE: For 0KW and circuit breakers (230/208 V) or pull disconnects (460 V) applications, insert 0Z in the KW field of model number.
TABLE 1
ELECTRICAL SPECIFICATIONS
Single Circuit
3
1
2
MCA
MOP
Field
Wire
Siz e
1
1
1
1 or 2
48
48
59
85
60
60
60
90
8
8
6
4
WL701-B00,B0Z
-B09
230/208-3
-B15
1
1
1
36
36
52
50
50
60
WL701-C00,C0Z
-C09
-C15
1
1
1
17
17
26
25
25
30
Models
Rated
N o. of
P o w er
Circuits
WL702-A00,A0Z
-A05
-A10
-A15
203/208-1
230/208-1
230/208-1
230/208-1
j
k
l
460-3
Dual Circuit
2
Ground
Wire
Siz e
3
MCA
1
2
2
MOP
Field Wire
Siz e
Ground
Wire Siz e
CKT
A
CKT
B
CKT
A
CKT
B
CKT
A
CKT
B
CKT
A
CKT
B
10
10
10
8
NA
NA
NA
59
NA
NA
NA
26
NA
NA
NA
60
NA
NA
NA
30
NA
NA
NA
6
NA
NA
NA
10
NA
NA
NA
10
NA
NA
NA
10
8
8
6
10
10
10
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
12
12
10
12
12
10
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
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 Electric Code (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 version), Article 310 for power conductor sizing. CAUTION: When more than one
filed power conductor circuit is run through one conduit, the conductors must be derated. Pay special attention to
Note * of Table 310 regarding Ampacity Adjustment Factors when more than 3 conductors are in a raceway.
Manual 2100-426
Page 2
TABLE 2
DIMENSION OF BASIC UNIT FOR ARCHITECTURAL AND
INSTALLATION REQUIREMENTS (NOMINAL)
Unit
WL70
Supply
Width Depth Height
W
D
H
42
22-1/4
94-7/8
A
Return
B
C
9-7/8 29-7/8
B
E
F
15-7/8 29-7/8 43-7/8
G
I
J
K
L
M
N
O
P
Q
19 41-5/8 30 42-11/16 37 44-3/4 42-1/2 3-1/4 43 33-7/8 10
All dimensions in inches.
FIGURE 1
UNIT DIMENSIONS
BACK VIEW
SIDE VIEW
FRONT VIEW
MIS-1416
TABLE 3
ELECTRIC HEAT TABLE
Models
WL702-A
240V-1
WL701-B
208V-1
240V-3
WL701-C
208V-3
460V-3
KW
AMPS
B TU H
AMPS
B TU H
AMPS
B TU H
AMPS
B TU H
AMPS
B TU H
5.0
20.8
17,050
18.1
12,800
---
---
---
---
---
---
9.0
---
---
---
---
21.7
30,600
18.7
23,030
10.8
30,700
10.0
41.6
34,130
36.2
25,600
---
---
---
---
---
---
15.0
62.5
51,200
54.1
38,400
36.2
51,200
31.2
38,400
17.3
47,000
Manual 2100-426
Page 3
SHIPPING DAMAGE
DUCT WORK
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.
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.
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.
Manual 2100-426
Page 4
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.
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 4
and 5 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.
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.
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 down the tabs
to allow spacing for the 2 inch filters.
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.
CONDENSATE DRAIN
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 minium blade position stops must be installed. See
Figure 2.
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.
FIGURE 2
BLOWER DAMPER ASSEMBLY
BLADE IS LOCKED
CLOSED FOR
SHIPPING
MIS-938
Manual 2100-426
Page 5
INSTALLATION INSTRUCTIONS
WALL MOUNTING INFORMATION
1. Two holes, for the supply and return air openings,
must be cut through the wall as shown in Figure 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. See
Figures 5 and 6.
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. See Figure 5.
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.
TYPICAL INSTALLATIONS
See Figure 6 for common ways to install the wall-mount
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.
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, 4 and 5 for
details.
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.
3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figure 5.
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.
Manual 2100-426
Page 6
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 (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.
See Start-up section for information on three phase
scroll compressor start-ups.
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:
TABLE 4
OPERATING VOLTAGE RANGE
TAP
RANGE
240V
253 - 216
208V
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).
FIGURE 3
MOUNTING INSTRUCTIONS
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.
NOTE: It is recommended that a bead of silicone
caulking be placed behind the side mounting flanges
and under the top flashing at the time of installation.
MIS-1430
Manual 2100-426
Page 7
TABLE 5
THERMOSTAT WIRE SIZE
Transformer
VA
FLA
Wire Gauge
Maximum
Distance
In Feet
2.3
20 gauge
18 gauge
16 gauge
14 gauge
12 gauge
45
60
100
160
250
55
TABLE 6
WALL THERMOSTAT AND SUBBASE COMBINATIONS
Thermostat
8403-002
T87F3111
8403-041
T8034C
S u b b ase
Predominate Features
8404-003 1 stage heat, 1 stage cool
Q539A1220 System: heat-off-cool Fan: auto-on
---
1 stage heat, 1 stage cool
System: heat-off-cool Fan: auto-on
8403-019
8404-012 1 stage cool, 2 stage heat
T874C1760 Q674A1001 System: heat-auto-cool Fan: auto-on
8403-021
8404-012 2 stage cool, 2 stage heat
T874D1934 Q674A1001 System: heat-auto-cool Fan: auto-on
8403-035
1F95-80
8403-043
CM-200
---
---
2 stage cool, 2 stage heat
Electronic
7 day programming
1 stage heat, 1 stage cool
System: heat-off-cool Fan: auto-on
FIGURE 4
ELECTRIC HEAT CLEARANCE
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.
Side section view of supply air
duct for wall mounted unit
showing 1/4 inch clearance to
combustible surfaces.
MIS-277
Manual 2100-426
Page 8
• Failure to do this could result in overheating
the combustible material and may result in
fire.
FIGURE 5
WALL-MOUNTING INSTRUCTIONS
SEE FIGURE 3 — MOUNTING INSTRUCTIONS
MIS-948
FIGURE 6
WALL-MOUNTING INSTRUCTIONS
SEE UNIT DIMENSIONS, FIGURE 1,
FOR ACTUAL DIMENSIONS
SEE FIGURE 1 FOR
DUCT DIMENSIONS
MIS-1051
Manual 2100-426
Page 9
FIGURE 7
COMMON WALL-MOUNTING INSTALLATIONS
MIS-1050
Manual 2100-426
Page 10
FIGURE 8
LOW VOLTAGE WIRING
MIS-1373C
Manual 2100-426
Page 11
START UP
IMPORTANT INSTALLER NOTE
HIGH PRESSURE SWITCH
For improved start-up performance, wash the indoor
coil with a dishwasher detergent.
The WA701 and WA721 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.
CRANKCASE HEATERS
WL701 units are provided with compressor crankcase
heat.
THREE PHASE SCROLL COMPRESSOR
START UP INFORMATION
The WL701 model has a band type heater located
around the bottom of the compressor. This heater is
controlled by the crankcase heater relay. The heater is
only energized when the compressor is not running.
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.
Some form of crankcase heat is essential to prevent
liquid refrigerant from migrating to the compressor,
casing 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 WL701 unit
detailing start-up procedure. This is very important.
Please read carefully.
FIGURE 9
START-UP LABEL
IMPORTANT
These procedures must be followed at
initial start-up and at any 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 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, 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
Manual 2100-426
Page 12
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.
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. Check all power fuses or circuit breakers to be sure
they are the correct rating.
3. Periodic cleaning of the outdoor coil to permit full
and unrestricted airflow circulation is essential.
SEQUENCE OF OPERATION
Cooling—Circuit R-Y makes at thermostat pulling in
compressor contactor, starting the compressor and
outdoor motor. 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 208/230 volt
models, when G circuit is de-energized the indoor
blower motor will continue to run for one minute. 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
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.
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.
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.
Manual 2100-426
Page 13
ADJUSTMENTS
PHASE MONITOR
Adjustable Delay on Make and Delay on Break
Timer
All units with three phase scroll compressors are
equipped with a 3 phase line monitor to prevent
compressor damage due to phase reversal.
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)
1.0 minute (60 seconds)
2.0 minute (120 seconds)
3.0 minute (180 seconds)
4.0 minute (240 seconds)
5.0 minute (300 seconds)
DOB
DOB
DOB
DOB
DOB
DOB
= 123 second DOM
= 126 second DOM
= 132 second DOM
= 138 second DOM
= 144 second DOM
= 150 second DOM
During routine operation of the unit with no power
interruptions the compressor will operate on demand
with no delay.
Typical Settings for Dual Unit Installation:
Unit 1: DOB set at 2 minutes, and DOM is 132 seconds
Unit 2: DOB set at 4 minutes, and DOM is 144 seconds
Manual 2100-426
Page 14
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.
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.
TROUBLESHOOTING
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 checked and blade adjusted in or out on the
motor shaft accordingly.
TABLE 7
FAN BLADE DIMENSIONS
Dimension A
WL70
1.25
TABLE 9
INDOOR BLOWER PERFORMANCE
CFM AT 230 V
WL70
E.S.P.
In H2O
FIGURE 10
FAN BLADE SETTING
Model
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.
High Speed
L o w S p eed
Dry Coil Wet Coil Dry Coil Wet Coil
.0
2,200
2,000
1,600
1,450
.1
2,100
1,900
1,525
1,375
.2
2,000
1,800
---
---
.3
1,875
1,700
---
---
.4
1,775
1,600
---
---
.5
1,650
1,475
---
---
REMOVAL OF FAN SHROUD
1. Disconnect all power to unit.
TABLE 10
CFM AND ESP
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.
Rated
Model
Rated
C FM
Recommended
ESP
Air Flow
R an g e
4. Unwire condenser fan motor.
WL70
1,800
.20
2,000 -- 1,375
5. Slide complete motor, fan blade, and shroud
assembly out the left side of the unit.
j
Rated CFM and ESP on high speed tap.
6. Service motor/fan as needed.
7. Reverse steps to reinstall.
TABLE 11
MAXIMUM ESP OF OPERATION
ELECTRIC HEAT ONLY
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 inches from compressor) as shown in the following
table:
TABLE 8
SUCTION LINE TEMPERATURES
1
Models
Rated
Airflow
95° F
OD Temp.
82° F
OD Temp.
WL70
1,800
58 - 60
56 - 58
Model
WL70
S p eed
KW
Low
S p eed
High
S p eed
-A00
-A05
-A10
.50
.50
.50
.50
.50
-B00
-B09
-B15
.50
.50
.50
.50
.50
.50
-C09
-C15
.50
.50
.50
.50
Manual 2100-426
Page 15
TABLE 12
COOLING PRESSURE – (ALL TEMPERATURES °F)
Model
WL702-A
WL701-B,-C
Return
Air
Temp. Pressure
75
80
85
90
95
100
105
110
115
75 D B
62 WB
Low S i de
High Side
68
215
68
228
69
242
70
256
71
272
72
289
73
305
74
324
75
343
80 D B
67 WB
Low S i de
High Side
73
220
73
234
74
248
75
263
76
279
77
296
78
313
79
332
80
352
85 D B
72 WB
Low S i de
High Side
76
228
76
242
77
257
78
272
79
289
80
306
81
324
82
344
83
364
75 D B
62 WB
Low S i de
High Side
62
214
63
230
64
247
65
265
66
280
67
299
68
316
69
333
70
351
80 D B
67 WB
Low S i de
High Side
67
220
68
236
69
254
70
271
71
287
72
306
73
324
74
342
75
360
85 D B
72 WB
Low S i de
High Side
72
225
73
243
74
261
75
279
76
297
77
316
78
335
79
353
80
372
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 instruction.
WL701-C
MODEL
DESCRIPTION
WL702-A
WL701-B
TABLE 13
OPTIONAL ACCESSORIES
EHWA05-A05L
Heater Package
X
EHWA10-A10L
Heater Package
X
EHWA15-A15L
Heater Package
X
EHWA05-B09L
Heater Package
X
EHWA05-B15L
Heater Package
X
EHWA05A-C09L
Heater Package
X
EHWA05A-C15L
Heater Package
X
BOP-5
Blank Off Plate
X
X
X
BFAD-5
Barometric Fresh Air Damper
X
X
X
MFAD-5
Motorized Fresh Air Damper
X
X
X
CRV-5
Classroom Ventilator with Exhaust
X
X
X
EIFM-5
Economizer with Exhaust
X
X
X
WERV-A5A
Energy Recovery Ventilator
X
X
WERV-C5A
Energy Recovery Ventilator
X
WMPD-01C
Pull Disconnect Kit
X
Manual 2100-426
Page 16