Bard THE WALL-MOUNT WA3S3-A User manual

Page 1 of 24
WALL-MOUNTED PACKAGED
AIR CONDITIONER
Models:
INSTALLATION INSTRUCTIONS
WA3S3-A
WA3S3-B
WA3S3-C
WA4S3-A
WA4S3-B
WA4S3-C
WA5S3-A
WA5S3-B
WA5S3-C
WL3S2-A
WL3S2-B
WL3S2-C
WL4S2-A
WL4S2-B
WL4S2-C
WL5S2-A
WL5S2-B
WL5S2-C
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual: 2100-526H
Supersedes: 2100-526G
Date: 7-13-18

Manual 2100-526H
Page 2 of 24
CONTENTS
Figures
Figure 1 Unit Dimensions .................................. 5
Figure 2 Mounting Instructions .......................... 9
Figure 3 Wall-Mounting Instructions ................. 10
Figure 4 Wall-Mounting Instructions ................. 10
Figure 5 Common Wall-Mounting Instructions.... 11
Figure 6 Electric Heat Clearance ...................... 12
Figure 7 Start-Up Label................................... 14
Figure 8 Fan Blade Setting .............................. 17
Figure 9 Control Disassembly .......................... 21
Figure 10 Winding Test...................................... 21
Figure 11 Drip Loop .......................................... 21
Getting Other Information and Publications .... 3
For more information contact these publishers ....... 3
Wall Mount General Information ......................... 4
Air Conditioner Wall Mount Model Nomenclature..... 4
Shipping Damage ................................................. 7
General ............................................................... 7
Duct Work ........................................................... 7
Filters ................................................................. 7
Condensate Drain ................................................. 7
Installation ............................................................... 8
Wall Mounting Information .................................... 8
Mounting the Unit ................................................ 8
Typical Installations.............................................. 8
Wiring – Main Power............................................. 8
Wiring – Low Voltage Wiring................................. 12
Start Up ................................................................... 13
General ............................................................. 13
Topping Off System Charge ................................. 13
Safety Practices ................................................. 13
Important Installer Note...................................... 14
Crankcase Heaters.............................................. 14
High and Low Pressure Switch............................. 14
Three Phase Scroll Compressor Start Up
Information........................................................ 14
Service Hints ..................................................... 15
Sequence of Operation........................................ 15
Compressor Control Module................................. 15
Adjustments ...................................................... 16
Phase Monitor.................................................... 16
Motor Start Device.............................................. 16
Pressure Service Ports ........................................ 16
Service ..................................................................... 17
Compressor Solenoid .......................................... 17
Fan Blade Setting Dimensions ............................. 17
Removal of Fan Shroud....................................... 17
R-410A Refrigerant Charge ................................. 18
Pressure Chart ................................................... 19
Troubleshooting GE ECM™Motors ........................ 20
Optional Accessories........................................... 23
Tables
Table 1 Electric Heat Table............................... 4
Table 2 Dimensions of Basic Unit...................... 5
Table 3 Electrical Specifications ....................... 6
Table 4 Operating Voltage Range..................... 12
Table 5 Thermostat Wire Size.......................... 12
Table 6 Wall Thermostats ............................... 12
Thermostatic Control – Dual Unit......... 12
Table 7 Fan Blade Dimensions........................ 17
Table 8 Cooling Pressure ................................ 19
Table 9 Indoor Blower Performance ................. 22
Table 10 Maximum ESP of Operation
Electric Heat Only.............................. 22
Table 11 Opt. Accessories (WA) ........................ 23
Table 12 Opt. Accessories (WL) ........................ 24

Manual 2100-526H
Page 3 of 24
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help when installing the air
conditioner or heat pump. These can usually be found
at the 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 or
Residential Winter and Manual N
Summer Air Conditioning
Low Pressure, Low Velocity ..........ACCA Manual D or
Duct System Design for Winter
Manual Q and Summer Air Conditioning
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, Inc.
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 2100-526H
Page 4 of 24
WALL MOUNT GENERAL INFORMATION
AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE
WA 3S 3 – A 09 B P X X X X
TABLE 1
ELECTRIC HEAT TABLE
See Table 3 on page 6 for heater availability by model
Nominal
Kw
At 240V At 208V At 480V At 460V 
Kw 1-Ph
Amps
3-Ph
Amps Btuh Kw 1-Ph Amps
3-Ph
Amps Btuh Kw 3-Ph Amps Btuh Kw 3-Ph Amps Btuh
5.0 5.0 20.8 17,065 3.75 18.0 12,799
6.0 6.0 14.4 20,478 4.50 12.5 15,359 6.0 7.2 20,478 5.52 6.9 18,840
8.0 8.0 33.3 27,304 6.00 28.8 20,478
9.0 9.0 21.7 30,717 6.75 18.7 23,038 9.0 10.8 30,717 8.28 10.4 28,260
10.0 10.0 41.7 34,130 7.50 36.1 25,598
15.0 15.0 62.5 36.1 51,195 11.25 54.1 31.2 38,396 15.0 18.0 51,195 13.8 17.3 47,099
20.0 20.0 83.3 68,260 15.00 72.1 51,195
These electric heaters are available in 230/208V units only.
These electric heaters are available in 480V units only.
VOLTS & PHASE
A – 230/208-1
B – 230/208/60-3
C – 460/60-3
KW
0Z – No KW
w/Circuit Breaker
or Pull Disconnect
05 – 5 KW
06 – 6 KW
08 – 8 KW
09 – 9 KW
10 – 10 KW
15 – 15 KW
20 – 20 KW
VENTILATION OPTIONS
B – Blank-off Plate (Standard)
M – Motorized Fresh Air Damper
V – Commercial Room Ventilator -
Motorized w/Exhaust
S – Economizer - Standard Versions,
Enthalpy
W – Economizer - Equipment Building,
Enthalpy
T – Economizer - Equipment Building,
DB Temp
R – Energy Recovery Ventilator
COLOR OPTIONS
X – Beige (Standard)
1 – White
4 – Buckeye Gray
5 – Desert Brown
8 – Dark Bronze
A – Aluminum
S – Stainless Steel
SUPPLY AIR OUTLET
X – Front (Standard)
COIL OPTIONS
X – Standard
1 – Phenolic Coated Evaporator
2 – Phenolic Coated Condenser
3 – Phenolic Coated Evaporator
and Condenser
CONTROL MODULES
(see Spec. Sheet S3378)
NOTE: For 0KW and circuit breakers (230/208 V) or rotary disconnects (460 V) applications, insert 0Z in the KW field of model number.
MODEL
NUMBER
WA – Right Hand
WL – Left Hand
CAPACITY
3S – 3 Ton
4S – 4 Ton
5S – 5 Ton
REVISION
WA – 3
WL – 2
FILTER OPTIONS
P – 2 Inch Pleated
MERV 8

Manual 2100-526H
Page 5 of 24
7.88
1.00
31.88
MIS-2487 B
1
2
2
1
2
Panel
Door
Vent Option
Condenser
Air Outlet
Filter Access
Ventilation
Air
Front View
5.75
F
W
G
Air
Inlet
Cond.
Low Voltage
Electric
Heat
Heater
Access
Panel
4° Pitch
Rain Hood
Built In
Entrance
Entrance
Electrical
Disconnect
Access Panel
(Lockable)
C. Breaker/
High Voltage
Electrical
Drain
Side View
2.13
J
D
K
A
C H
I
Mounting
Side Wall
Supply Air Opening
Brackets
Location
Shipping
Return Air Opening
(Built In)
Optional
Electrical
Entrances
Top Rain
Flashing
Bottom Installation
Bracket
Back View
L
M
O
E
R
S
S
S
S
S
T
.44
N
Q
P
B
TABLE 2
DIMENSIONS OF BASIC UNIT FOR ARCHITECTURAL & INSTALLATION REQUIREMENTS (NOMINAL)
All dimensions in inches. Dimensional drawings are not to scale.
I
A
C
K
2.13
H
J
2.63
9.06
P
M
L
O
E
.44 W
5.75
F
G
R
S
S
S
S
S
T
D
Return Air Opening
MIS-2488 B
Drain
Inlet
Air Air Outlet
Front ViewSide View
Cond.
1
Back View
Condenser
Bracket
Installation
Bottom
(Built In)
Brackets
Mounting
Side Wall
Location
Shipping
Flashing
Entrances
Electrical
Optional
Entrance
Electrical
High Voltage
Entrance
Electrical
Air
Ventilation
Door
Vent Option
Panel
Filter Access
Low Voltage
Top Rain (Lockable)
Access Panel
Heat
Electric
Disconnect
Panel
Access
Heater
C. Breaker/
Built In
Rain Hood
4° Pitch
1
Supply Air Opening
Unit
Width
W
Depth
D
Height
H
Supply Return
E F G I J K L M N O P Q R S TA B C B
WA/L3S*
42.075 22.432
84.875
9.88 29.88 15.88 29.88 43.88 19.10
31.66
30.00
32.68 26.94 34.69 32.43
3.37 42.88
23.88
10.00 1.44 16.00 1.88WA/L4S
94.875 41.66 42.68 36.94 44.69 42.43 33.88
WA/L5S*
FIGURE 1
UNIT DIMENSIONS
Dimension is 21.00 inches on WA/L4S2 & WA/L5S2 models.
WA*S*
RIGHT
UNIT
WL*S*
LEFT
UNIT

Manual 2100-526H
Page 6 of 24
Model
Rated
Volts
and
Phase
No. Field
Power
Circuits

Minimum
Circuit
Ampacity

Maximum
External
Fuse or
Ckt. Brkr.

Field
Power
Wire
Size

Ground
Wire

Minimum
Circuit Ampacity

Maximum
External Fuse or
Ckt. Brkr.

Field Power
Wire Size

Ground
Wire
Ckt. A Ckt. B Ckt. C Ckt. A Ckt. B Ckt. C Ckt. A Ckt. B Ckt. C Ckt. A Ckt. B Ckt. C
WA/L3S* - A0Z
- A05 - A08 - A10 - A15 - A20
230/208-1
1 1 1
1 or 2 1 or 2 1 or 3
31 35 51 61 87
113
45 45 60 70 90
115
8 8 6 6 3 2
10 10 10
8 8 6
35 35 35
26 52 52 26
45 45 45
30 60 60 30
8 8 8
10
6 6 10
10 10 10
10 10 10 10
WA/L3S* - B0Z
- B06 - B09 - B15
230/208-3
1 1 1 1
23 27 36 55
30 30 40 60
10 10
8 6
10 10 10 10
WA/L3S* - C0Z
- C06 - C09 - C15
460-3
1 1 1 1
12
13.5
19 28
15 15 20 30
14 14 12 10
14 14 12 10
WA/L4S* - A0Z
- A05 - A08 - A10 - A15 - A20
230/208-1
1 1 1
1 or 2 1 or 2 1 or 3
38 38 53 63 89
115
45 45 60 70 90
120
8 8 6 4 3 2
10 10 10
8 8 6
37 37 37
26 52 52 26
45 45 45
30 60 60 30
8 8 8
10
6 6 10
10 10 10
10 10 10 10
WA/L4S* - B0Z
- B06 - B09
- B1
230/208-3
1 1 1 1
28 29 38 56
40 40 40 60
10 10
8 6
10 10 10 10
WA/L4S* - C0Z
- C06 - C09 - C15
460-3
1 1 1 1
15 16 21 30
20 20 25 30
12 12 10 10
12 12 10 10
WA/L5S* - A0Z
- A05 - A08 - A10 - A15 - A20
230/208-1
1 1 1
1 or 2 1 or 2 1 or 3
44 44 53 63 89
115
50 50 60 70 90
120
8 8 6 6 3 2
10 10 10
8 8 6
44 44 44
26 52 52 26
50 50 50
30 60 60 30
8 8 8
10
6 6 10
10 10 10
10 10 10 10
WA/L5S* - B0Z
- B06 - B09 - B15
230/208-3
1 1 1 1
34 34 38 56
40 40 40 60
8 8 8 6
10 10 10 10
WA/L5S* - C0Z
- C06 - C09 - C15
460-3
1 1 1 1
17 17 21 30
25 25 25 30
10 10 10 10
10 10 10 10

Maximum size of the time delay fuse or 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.
TABLE 3
ELECTRICAL SPECIFICATIONS

Manual 2100-526H
Page 7 of 24
SHIPPING DAMAGE
Upon receipt of equipment, the carton should be
checked for external signs of shipping damage. If
damage is found, the receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent.
GENERAL
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.
The refrigerant system is completely assembled and
charged. All internal wiring is complete.
The unit is designed for use with or without duct work.
Flanges are provided for attaching the supply and
return ducts.
These instructions explain the recommended method
to install the air cooled self-contained unit and the
electrical wiring connections to the unit.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly “Starting
Procedure” and any tags and/or labels attached to the
equipment.
While these instructions are intended as a general
recommended guide, they do not supersede any
national and/or local codes in any way. Authorities
having jurisdiction should be consulted before the
installation is made. See page 3 for information on
codes and standards.
Size of unit for a proposed installation should be based
on heat loss calculation made according to methods of
Air Conditioning Contractors of America (ACCA). The
air duct should be installed in accordance with the
Standards of the National Fire Protection Association
for the Installation of Air Conditioning and Ventilating
Systems of Other Than Residence Type, NFPA No.
90A, and Residence Type Warm Air Heating and Air
Conditioning Systems, NFPA No. 90B. Where local
regulations are at a variance with instructions, installer
should adhere to local codes.
DUCT WORK
All duct work, supply and return, must be properly sized
for the design airflow requirement of the equipment.
Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing. All duct work or
portions thereof not in the conditioned space should be
properly insulated in order to both conserve energy and
prevent condensation or moisture damage.
Refer to Table 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 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.
Any grille that meets the 5/8 inch louver criteria, may
be used. It is recommended that Bard Return Air
Grille Kit RG-5 or 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 2-inch pleated 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 filter access panel. The internal filter brackets are
adjustable to accommodate the 1-inch filter by bending
up the tabs to allow spacing for the 1-inch filters.
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.
CAUTION
Some installations may not require any return
air duct. A 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.

Manual 2100-526H
Page 8 of 24
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 4 and 5.
INSTALLATION
3. Concrete block walls must be thoroughly inspected
to insure that they are capable of carrying the
weight of the installing unit. See Figure 4.
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 2, 3
and 6 for details.
3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figure 4.
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 2.
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 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 5 for common ways to install the wall mount
unit.
WIRING – MAIN POWER
Refer to the unit rating plate for wire sizing information
and maximum fuse or circuit breaker size. Each
outdoor unit is marked with a “Minimum Circuit
Ampacity”. This means that the field wiring used must
be sized to carry that amount of current. Depending on
the installed KW of electric heat, there may be two field
power circuits required. If this is the case, the unit
serial plate will so indicate. All models are suitable
only for connection with copper wire. Each unit and/or
wiring diagram will be marked “Use Copper Conductors
Only”. These instructions must be adhered to. Refer
to the National Electrical Code (NEC) for complete
current carrying capacity data on the various insulation
grades of wiring material. All wiring must conform to
NEC and all local codes.
The electrical data lists fuse and wire sizes (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.
WARNING
Fire hazard can result if 1/4 inch clearance
to combustible materials for supply air duct is
not maintained. See Figure 3.
WARNING
Failure to provide the 1/4 inch clearance
between the supply duct and a combustible
surface for the rst 3 feet of duct can result in
re.

Manual 2100-526H
Page 9 of 24
FIGURE 2
MOUNTING INSTRUCTIONS
The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or circuit breaker that is to be used with
the equipment. The correct size must be used for
proper circuit protection and also to assure that there
will be no nuisance tripping due to the momentary high
starting current of the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect.
To convert for the locking capability, bend the tab
located in the bottom left hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.
See Start-up section for information on three phase
scroll compressor start-ups.
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.
B
16"
16"
16"
16"
16"
17
8"
61
2" 6 1 2"
21
8"
7
8"
1"
3"
4"
Typ.
4"
Typ.
61
2"30"
E
16"
A CC
31
8"
D
1
RAIN FLASHING
1
1
DUCT
REQUIRED DIMENSIONS TO MAINTAIN
1/4" MIN. CLEARANCE FROM
COMBUSTIBLE MATERIALS
REQUIRED DIMENSIONS TO MAINTAIN
RECOMMENDED 1" CLEARANCE FROM
COMBUSTIBLE MATERIALS
ABCDE
30 1/210 1/26 1/411/4 29 3/4
32 12 5 1/2
TOPFOAM AIR SEAL
HEATER ACCESS
RETURN AIR
2
Wall Opening and Hole Location View Right Side View
29
OPENING
SUPPLIED
Supply Opening
NOTES:
SUPPLY AIR
IT IS RECOMMENDED THAT A BEAD OF
Return Opening
SILICONE CAULKING BE PLACED BEHIND
THE SIDE MOUNTING FLANGES AND UNDER
TOP FLASHING AT TIME OF INSTALLATION.
TOP.
FOUR SIDES OF SUPPLY
WALL AIR DUCT IS REQUIRED
WALL STRUCTURE
FROM COMBUSTABLE
1/4" CLEARANCE ON ALL
PANEL
MATERIALS
SEAL WITH BEAD
OF CAULKING ALONG
ENTIRE LENGTH OF
W**A UNIT SHOWN, W**L UNIT
CONTROLS AND HEATER ACCESS
IS ON OPPOSITE (LEFT) SIDE.
MIS-416 D
Dimension is 21" on 95" tall Units.

Manual 2100-526H
Page 10 of 24
FIGURE 4
WALL-MOUNTING INSTRUCTIONS
FIGURE 3
WALL-MOUNTING INSTRUCTIONS
DUCT
OPENING
RETURN AIR
SUPPLY AIR
WOOD FRAME WALL INSTALLATION
OPENING
WALL BEFORE
MOUNT ON UNIT
OPENING
BEFORE INSTALLATION
BOTTOM MOUNTING
CONCRETE BLOCK WALL INSTALLATION
BRACKET. MOUNT ON
OPENING
WOOD OR STEELSIDING
OPENING
INSTALLING UNIT.
RETURN AIR
WALL STRUCTURE
RETURN AIR
SUPPLY AIR
FACTORY SUPPLIED
RAIN FLASHING.
SUPPLY AIR
MIS-548 A
SIDE VIEW
I
A
C
K
E + 1.000
B
1.000
SUPPLY DUCT
OVER FRAME
INTERIOR FINISHED WALL
ALL AROUND DUCT
FRAMING MATERIAL
EXTERIOR FINISH WALL
OPENING
FOR ACTUAL DIMENSIONS.
2 x 4'S, 2 x 6'S &/OR
STRUCTURAL STEEL
ATTACH TO TOP
1.000" CLEARANCE
1.000" CLEARANCE
PLATE OF WALL
C
SEE UNIT DIMENSIONS, FIGURE 2,
OPENING
RETURN DUCT
2 x 6
ATTACH TO BOTTOM
OVER FRAME
PLATE OF WALL
L
THIS STRUCTURAL MEMBER
LOCATED TO MATCH STUD
SPACING FOR REST OF WALL.
A SECOND MEMBER MAY BE
REQUIRED FOR SOME WALLS.
MIS-549 B
ALL AROUND DUCT
SEE FIGURE 3 – MOUNTING INSTRUCTIONS
SEE UNIT DIMENSIONS, FIGURE 1,
FOR ACTUAL DIMENSIONS
SEE FIGURE 1 FOR
DUCT DIMENSIONS

Manual 2100-526H
Page 11 of 24
FIGURE 5
COMMON WALL-MOUNTING INSTALLATIONS
LOWERED
RAISED FLOOR
RAFTERS
SUPPLY AIR
CEILING SURFACE
WALL SLEEVE
RETURN AIR
CLOSET WALL
GRILLE
FLASHING
RETURN AIR
FLASHING
SUPPLY DUCT MAYBE LOCATED INANATTIC
OR BELOW CEILING RAFTERS AS SHOWN
SUPPLY DUCT MAY BE LOCATED INANATTIC
SURFACE
RAFTERS
FINISHED CEILING
SUPPLY AIRDUCT
WALL
OPENING W/ GRILLE
SUPPLY DUCT MAYBE LOCATED INANATTIC
OR BELOW CEILING RAFTERS AS SHOWN
CEILING
RAIN
RETURN AIR
SLEEVE
WALL
SUPPLY AIRDUCT
RAFTERS
RAFTERS
RETURN AIR
OPENING W/ GRILLE
RAIN
FALSE WALL INSTALLATION
DUCTED SUPPLY
GRILLE
OUTSIDE
SPACE
FALSE WALL
RETURN AIR GRILLE
OUTSIDE
OR BELOW CEILING RAFTERS AS SHOWN
FINISHED CEILING SURFACE
RAIN
FLASHING
RAIN
FLASHING
RETURN AT UNITNO DUCT
WALL
SUPPLY AIRDUCT
CLOSETINSTALLATION
RETURN AIR
FINISHED
FINISHED CEILING SURFACE
MIS-550 B
FREE AIR FLOW
OUTSIDE
WALL
OUTSIDE
WALL
SUPPLY AIRDUCT
W/ GRILLE

Manual 2100-526H
Page 12 of 24
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).
Eight (8) wires should be run from thermostat subbase to
the 24V terminal board in the unit. An eight conductor,
18 gauge copper, color-coded thermostat cable is
recommended. See Manual 2100-507 (latest revision)
for low voltage wiring options.
WIRING – LOW VOLTAGE WIRING
230/208V, 1 phase and 3 phase are equipped with
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 shown in Table 4 below.
TABLE 6
WALL THERMOSTATS
TABLE 5
THERMOSTAT WIRE SIZE
THERMOSTATIC CONTROL
FOR DUAL UNIT APPLICATION
TABLE 4
OPERATING VOLTAGE RANGE
FIGURE 6
ELECTRIC HEAT CLEARANCE
Part Number Predominate Features
8403-060
(1120-445)
3 stage Cool; 3 stage
Heat Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover
8403-058
(TH5220D1151)
2 stage Cool, 2 stage Heat
Electronic Non-Programmable
Auto or Manual changeover
Transformer
VA FLA Wire Gauge
Maximum
Distance
in Feet
50 2.1
20 gauge
18 gauge
16 gauge
14 gauge
12 gauge
45
60
100
160
250
Thermostat Predominate Features Bard Specifications
TEC40 2-Unit/2-Stage Heat/2-Stage Cool
Controller See Spec. Sheet S3353
MC3000 2-Unit/2-Stage Heat/2-Stage Cool
Controller with Option Alarms See Spec. Sheet S3379
Side section view of supply air duct for wall
mounted unit showing 1/4 inch clearance to
combustible surfaces.
WARNING
• A minimum of 1/4 inch clearance must be
maintained between the supply air duct and
combustible materials. This is required for the
rst 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 re.
TAP RANGE
240V 253 - 216
280V 220 - 187

Manual 2100-526H
Page 13 of 24
START UP
These units require R-410A refrigerant and Polyol Ester
oil.
GENERAL
1. Use separate service equipment to avoid cross
contamination of oil and refrigerants.
2. Use recovery equipment rated for R-410A
refrigerant.
3. Use manifold gauges rated for R-410A (800
psi/250 psi low).
4. R-410A is a binary blend of HFC-32 and HFC-125.
5. R-410A is nearly azeotropic - similar to R-22 and
R-12. Although nearly azeotropic, charge with
liquid refrigerant.
6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot
withstand this higher pressure.
7. R-410A has an ozone depletion potential of zero,
but must be reclaimed due to its global warming
potential.
8. R-410A compressors use Polyol Ester oil.
9. Polyolester oil is hygroscopic; it will rapidly absorb
moisture and strongly hold this moisture in the oil.
10. A liquid line dryer must be used - even a deep
vacuum will not separate moisture from the oil.
11. Limit atmospheric exposure to 15 minutes.
12. If compressor removal is necessary, always plug
compressor immediately after removal. Purge with
small amount of nitrogen when inserting plugs.
TOPPING OFF SYSTEM CHARGE
If a leak has occurred in the system, Bard
Manufacturing recommends reclaiming, evacuating
(see criteria above), and charging to the nameplate
charge. Topping off the system charge can be done
without problems.
With R-410A, there are no significant changes in the
refrigerant composition during multiple leaks and
recharges. R-410A refrigerant is close to being an
azeotropic blend (it behaves like a pure compound
or single component refrigerant). The remaining
refrigerant charge, in the system, may be used after
leaks have occurred and then “top-off” the charge by
utilizing the pressure charts on the inner control panel
cover as a guideline.
REMEMBER: When adding R-410A refrigerant, it
must come out of the charging cylinder/tank as a liquid
to avoid any fractionation, and to insure optimal system
performance. Refer to instructions for the cylinder that
is being utilized for proper method of liquid extraction.
SAFETY PRACTICES
1. Never mix R-410A with other refrigerants.
2. Use gloves and safety glasses, Polyol Ester oils can
be irritating to the skin, and liquid refrigerant will
freeze the skin.
3. Never use air and R-410A to leak check; the
mixture may become flammable.
4. Do not inhale R-410A – the vapor attacks
the nervous system, creating dizziness, loss
of coordination and slurred speech. Cardiac
irregularities, unconsciousness and ultimate death
can result from breathing this concentration.
5. Do not burn R-410A. This decomposition produces
hazardous vapors. Evacuate the area if exposed.
6. Use only cylinders rated DOT4BA/4BW 400.
7. Never fill cylinders over 80% of total capacity.
8. Store cylinders in a cool area, out of direct
sunlight.
9. Never heat cylinders above 125°F.
10. Never trap liquid R-410A in manifold sets, gauge
lines or cylinders. R-410A expands significantly
at warmer temperatures. Once a cylinder or line is
full of liquid, any further rise in temperature will
cause it to burst.

Manual 2100-526H
Page 14 of 24
IMPORTANT INSTALLER NOTE
For improved start-up performance, wash the indoor
coil with a dishwasher detergent.
CRANKCASE HEATERS
All units covered in this manual are provided with
compressor crankcase heat.
This crankcase heater is 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.
Crankcase heat is essential to prevent liquid refrigerant
from migrating to the compressor, preventing oil pump
out on compressor start-up and possible bearing or
scroll vane failure due to compressing a liquid.
The decal in Figure 7 is affixed to all model units
detailing start-up procedure. This is very important.
Please read carefully.
HIGH AND LOW PRESSURE SWITCH
All models covered by this manual are supplied with
a remote reset high pressure switch and low pressure
switch. If tripped, this pressure switch may be reset by
turning the thermostat off then back on again.
NOTE: Defective pressure switches can be replaced
without reclaiming system charge as they are screwed
onto the service port rather than brazed onto the
system.
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 ZPS 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.
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.
See “Phase Monitor”, page 16.
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
FIGURE 7
START-UP LABEL

Manual 2100-526H
Page 15 of 24
SERVICE HINTS
1. Maintain clean air filters at all times. Also, do
not close off or block 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.
Frequency of coil cleaning will depend on duty
cycle of equipment, type of use and installation
site variables. Telecommunication type
installations in high traffic areas or in areas none
too frequent to airborne debris, will require more
frequent coil maintenance than those in areas not
subject to those conditions.
SEQUENCE OF OPERATION
NON-ECONOMIZER
Stage 1 (Y1) cooling call activates Step 1 (partial
capacity, 66%) of compressor capacity.
Stage 2 (Y2) cooling call activates Step 2 (full capacity,
100%) of compressor capacity.
WITH ECONOMIZER
Stage 1 (Y1) cooling call goes to economizer controls
for decision:
- If Enthalpy Control decides outdoor conditions
are suitable for free cooling, the economizer will
operate.
• If Stage 2 cooling call is issued during
economizer operation, the economizer will
close and the compressor will go straight to
Step 2 full capacity operation.
- If Enthalpy Control decides outdoor conditions
are not suitable for free cooling, the economizer
will not operate (or close) and Step 1 of the
compressor will operate.
• If Stage 2 cooling call is issued, the
compressor will shift to Step 2 full cooling
capacity operation.
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 anytime power is interrupted to
the unit, the delay on make period begins, which will
be 2 minutes plus 10% of the delay on break setting.
When the delay on make is complete and the high
pressure and low pressure switches are 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.
Optional Low Ambient Control
An optional low ambient control is available for both
factory and field installed options. The low ambient
control is to be applied to the WA3S/WA4S/WA5S
models when operation below 50°outdoor conditions
are anticipated. Without this device, the evaporating
pressure would fall off, and the indoor coil would ice
over.
The fan cycling control cycles the fan motor on, once
the liquid refrigerant pressure reaches 350 psig, and
off, once it has dropped to 225 psig. It will continue to
cycle between these parameters depending on outdoor
temperatures and the load/stage of the system.
This cycling maintains a minimum liquid pressure
affecting the minimum suction pressure. This effect
insures an evaporating temperature that is slightly
above the point of ice formation on the evaporator.

Manual 2100-526H
Page 16 of 24
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.
MOTOR START DEVICE
Single Phase (-A) model compressor circuits are
equipped with a 25 ohm PTCR (Positive Temperature
Coefficient Resistor) motor starting device as standard
equipment.
The PTCR is wired in parallel with the run capacitor.
When voltage is applied, and device is cool, its low
resistance permits a large current to flow in the
auxiliary windings - increasing the motors available
starting torque. The device then rapidly heats up,
and the current levels drop to a few milliamperes.
The PTCR then becomes self-regulating, passing just
enough current to maintain its temperature to remain
in the high resistance state. Once the voltage source is
removed, the device then cools down and the resistance
drops, and is then ready for the next compressor start
cycle.
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.
Be careful to observe whether unit is operating in high
cool or low cool when utilizing the charts.
This unit employs high-flow Coremax valves instead of
the typical Shrader type valves.
WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result in
eye injuries or refrigerant burns!
To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.
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.
ADJUSTMENTS
Adjustable Delay on Make and Delay on Break Timer
The potentiometer is used to select Delay on Break time
from 30 seconds to 5 minutes. Delay on Make (DOM)
timing on power-up and after power interruptions is
equal to 2 minutes plus 10% of Delay on Break (DOB)
setting:
0.5 minute (30 seconds) DOB = 123 second DOM
1.0 minute (60 seconds) DOB = 126 second DOM
2.0 minute (120 seconds) DOB = 132 second DOM
3.0 minute (180 seconds) DOB = 138 second DOM
4.0 minute (240 seconds) DOB = 144 second DOM
5.0 minute (300 seconds) DOB = 150 second DOM
During routine operation of the unit with no power
interruptions the compressor will operate on demand
with no delay.
Typical Settings for Dual Unit Installation:
Unit 1: DOB set at 2 minutes, and DOM is 132
seconds
Unit 2: DOB set at 4 minutes, and DOM is 144
seconds

Manual 2100-526H
Page 17 of 24
FAN BLADE SETTING DIMENSIONS
Shown in the drawing below are the correct fan blade
setting dimensions for proper air delivery across the
outdoor coil. See Figure 8.
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. See Table 7.
SERVICE
COMPRESSOR SOLENOID
(See Sequence of Operation on page 15 for function.)
A nominal 24-volt direct current coil activates the
internal compressor solenoid. The input control
circuit voltage must be 18 to 28 volt ac. The coil
power requirement is 20 VA. The external electrical
connection is made with a molded plug assembly.
This plug contains a full wave rectifier to supply direct
current to the unloader coil.
Compressor Solenoid Test Procedure If it is suspected
that the unloader is not working, the following methods
may be used to verify operation.
1. Operate the system and measure compressor
amperage. Cycle the compressor solenoid on
and off at ten-second intervals. The compressor
amperage should go up or down at least 25 percent.
2. If step one does not give the expected results, shut
unit off. Apply 18 to 28 volt ac to the solenoid
molded plug leads and listen for a click as the
solenoid pulls in. Remove power and listen for
another click as the solenoid returns to its original
position.
3. If clicks can’t be heard, shut off power and remove
the control circuit molded plug from the compressor
and measure the solenoid coil resistance. The
resistance should be 32 to 60 ohms depending on
compressor temperature.
4. Next, check the molded plug.
Voltage check: Apply control voltage to the plug wires
(18 to 28 volt ac). The measured dc voltage at the
female connectors in the plug should be around 15 to
27 vdc.
Resistance check: Measure the resistance from the end
of one molded plug lead to either of the two female
connectors in the plug. One of the connectors should
read close to zero ohms, while the other should read
infinity. Repeat with other wire. The same female
connector as before should read zero, while the other
connector again reads infinity. Reverse polarity on the
ohmmeter leads and repeat. The female connector that
read infinity previously should now read close to zero
ohms.
Replace plug if either of these test methods does not
show the desired results.
FIGURE 8
FAN BLADE SETTING
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. 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 re-install.
TABLE 7
FAN BLADE DIMENSIONS
"A"
AIRFLOW
MIS-1724
Model Dimension A
WA/L3S*
WA/L4S*
WA/L5S*
1.75"

Manual 2100-526H
Page 18 of 24
R-410A REFRIGERANT CHARGE
This unit was charged at the factory with the quantity of
refrigerant listed on the serial plate. AHRI capacity and
efficiency ratings were determined by testing with this
refrigerant charge quantity.
The following pressure tables show nominal pressures
for the units. Since many installation specific
situations can affect the pressure readings, this
information should only be used by certified technicians
as a guide for evaluating proper system performance.
They shall not be used to adjust charge. If charge is in
doubt, reclaim, evacuate and recharge the unit to the
serial plate charge.

Manual 2100-526H
Page 19 of 24
TABLE 8
COOLING PRESSURE – (ALL TEMPERATURES °F)
Low side pressure ± 4 psig
High side pressure ± 10 psig
HIGH CAPAPACITY COOLING AIR TEMPERATURE ENTERING OUTDOOR COIL DEGREE F
Model Return Air Temp
(DB/WB) Pressure 50˚F 55˚F 60˚F 65˚F 70˚F 75˚F 80˚F 85˚F 90˚F 95˚F 100˚F 105˚F 110˚F 115˚F
WA3S*
WL3S*
75˚DB
62˚WB
Low Side
High Side
112
195
115
214
119
233
122
253
126
272
129
291
131
314
132
337
134
360
135
383
136
409
138
435
139
461
140
487
80˚DB
67˚WB
Low Side
High Side
124
201
127
220
131
239
134
259
138
278
141
297
142
319
144
341
145
363
147
390
148
413
149
440
151
468
152
495
85˚DB
72˚WB
Low Side
High Side
135
205
138
224
142
243
145
263
149
282
152
301
154
326
156
350
157
375
159
399
161
425
162
451
164
476
165
502
WA4S*
WL4S*
75˚DB
62˚WB
Low Side
High Side
117
197
119
216
121
235
123
255
125
274
127
293
128
316
130
339
131
361
132
383
133
410
135
438
136
466
137
494
80˚DB
67˚WB
Low Side
High Side
127
201
129
220
131
239
134
259
136
278
138
298
138
318
139
341
139
364
143
400
143
415
144
443
146
471
149
500
85˚DB
72˚WB
Low Side
High Side
141
203
143
223
145
243
148
263
150
283
152
303
152
326
153
349
153
372
154
396
156
422
158
449
160
478
162
508
WA5S*
WL5S*
75˚DB
62˚WB
Low Side
High Side
118
199
119
217
120
236
122
260
123
285
125
309
126
333
128
357
129
381
130
405
132
432
133
460
135
487
136
514
80˚DB
67˚WB
Low Side
High Side
129
205
130
224
131
247
131
270
132
292
132
315
134
339
137
363
139
387
141
425
143
438
145
465
146
492
148
519
85˚DB
72˚WB
Low Side
High Side
137
216
139
237
140
258
141
279
142
300
143
321
146
346
148
370
151
395
153
419
155
447
157
474
158
502
160
529
LOW CAPAPACITY COOLING AIR TEMPERATURE ENTERING OUTDOOR COIL DEGREE F
Model Return Air Temp
(DB/WB) Pressure 50˚F 55˚F 60˚F 65˚F 70˚F 75˚F 80˚F 85˚F 90˚F 95˚F 100˚F 105˚F 110˚F 115˚F
WA3S*
WL3S*
75˚DB
62˚WB
Low Side
High Side
126
181
127
198
129
215
130
233
132
250
133
267
135
289
136
310
138
332
139
353
141
378
144
404
146
429
148
454
80˚DB
67˚WB
Low Side
High Side
137
184
138
201
139
218
141
236
142
253
143
270
145
291
147
312
149
333
151
354
153
380
155
406
156
432
158
458
85˚DB
72˚WB
Low Side
High Side
153
190
154
207
155
224
156
241
157
258
158
275
160
297
162
318
163
340
165
361
167
387
168
413
170
438
171
464
WA4S*
WL4S*
75˚DB
62˚WB
Low Side
High Side
122
184
124
201
125
218
127
236
129
254
131
272
131
291
132
312
133
335
134
359
135
381
137
407
139
435
141
463
80˚DB
67˚WB
Low Side
High Side
132
185
134
203
136
221
138
239
140
257
142
275
145
298
146
317
147
339
148
362
149
384
150
410
151
438
152
467
85˚DB
72˚WB
Low Side
High Side
145
187
147
205
149
223
152
241
154
259
156
278
156
397
157
319
158
343
159
369
161
390
163
415
164
443
165
472
WA5S*
WL5S*
75˚DB
62˚WB
Low Side
High Side
123
187
125
207
127
226
129
245
131
263
133
282
134
305
135
328
136
350
137
373
139
399
141
425
143
451
145
477
80˚DB
67˚WB
Low Side
High Side
134
192
136
211
138
230
139
248
141
267
143
286
145
308
147
331
149
353
151
375
153
402
155
429
156
456
158
483
85˚DB
72˚WB
Low Side
High Side
146
200
148
217
149
235
151
252
152
270
154
287
156
311
159
335
161
358
163
382
165
408
166
434
168
460
169
486

Manual 2100-526H
Page 20 of 24
TROUBLESHOOTING GE ECM™MOTORS
CAUTION:
Disconnect power from unit before removing or replacing
connectors, or servicing motor. To avoid electric shock from
the motor’s capacitors, disconnect power and wait at least 5
minutes before opening motor.
Symptom Cause/Procedure
Motor rocks slightly • This is normal start-up for ECM
when starting
Motor won’t start • Check blower turns by hand
• No movement • Check power at motor
• Check low voltage (24 Vac R to C) at motor
• Check low voltage connections
(G, Y, W, R, C) at motor
• Check for unseated pins in connectors on
motor harness
• Test with a temporary jumper between R - G
• Check motor for tight shaft
• Perform motor/control replacement check
• Perform Moisture Check
• Motor rocks, • Check for loose or compliant motor mount
but won’t start • Make sure blower wheel is tight on shaft
• Perform motor/control replacement check
Motor oscillates up • It is normal for motor to oscillate with no
load & down while being on shaft
tested off of blower
Motor starts, but
runs erratically
• Varies up and down • Check line voltage for variation or “sag”
or intermittent • Check low voltage connections
(G, Y, W, R, C) at motor, unseated pins in
motor harness connectors
• Check “Bk” for erratic CFM command (in
variable-speed applications)
• Check out system controls, Thermostat
• Perform Moisture Check
• “Hunts” or “puffs” at • Does removing panel or lter reduce
high CFM (speed) “pufng”?
- Reduce restriction
- Reduce max airow
• Stays at low CFM • Check low voltage (Thermostat) wires and
despite system call connections
for cool or heat CFM • Verify fan is not in delay mode; wait until
delay complete
• “R” missing/not connected at motor
• Perform motor/control replacement check
• Stays at high CFM • “R” missing/not connected at motor
• Is fan in delay mode? - wait until delay time
complete
• Perform motor/control replacement check
• Blower won’t shut off •
Current leakage from controls into G, Y or W?
Check for Triac switched thermostat or solid-
state relay
Excessive noise • Determine if it’s air noise, cabinet, duct or
motor noise; interview customer, if necessary
• Air noise • High static creating high blower speed?
- Is airow set properly?
- Does removing lter cause blower to slow
down? Check lter
- Use low-pressure drop lter
- Check/correct duct restrictions
Symptom Cause/Procedure
• Noisy blower or cabinet • Check for loose blower housing, panels, etc.
• High static creating high blower speed?
- Check for air whistling through seams in
ducts, cabinets or panels
- Check for cabinet/duct deformation
• “Hunts” or “puffs” at • Does removing panel or lter reduce
high CFM (speed) “pufng”?
- Reduce restriction
- Reduce max. airow
Evidence of Moisture
• Motor failure or • Replace motor and
Perform Moisture
Check
malfunction has occurred
and moisture is present
• Evidence of moisture • Perform Moisture Check
present inside air mover
Do Don’t
• Check out motor, controls, • Automatically assume the motor is bad.
wiring and connections
thoroughly before replacing
motor
• Orient connectors down so • Locate connectors above 7 and 4 o’clock
water can’t get in positions
- Install “drip loops”
• Use authorized motor and • Replace one motor or control model # with
model #’s for replacement another (unless an authorized replacement)
• Keep static pressure to a • Use high pressure drop lters some have
½”
minimum: H20 drop!
- Recommend high • Use restricted returns
efciency, low static lters
- Recommend keeping lters
clean.
- Design ductwork for min.
static, max. comfort
- Look for and recommend
ductwork improvement,
where necessary
• Size the equipment wisely • Oversize system, then compensate with low
airow
• Check orientation before • Plug in power connector backwards
inserting motor connectors • Force plugs
Moisture Check
• Connectors are oriented “down” (or as recommended by equipment
manufacturer)
• Arrange harness with “drip loop” under motor
• Is condensate drain plugged?
• Check for low airow (too much latent capacity)
• Check for undercharged condition
• Check and plug leaks in return ducts, cabinet
Comfort Check
• Check proper airow settings
• Low static pressure for lowest noise
• Set low continuous-fan CFM
• Use humidistat and 2-speed cooling units
• Use zoning controls designed for ECM that regulate CFM
• Thermostat in bad location?