Bard WA3S3 User manual

Manual 2100-526E
Page 1 of 24
Manual : 2100-526E
Supersedes: 2100-526D
File: Volume III Tab 16
Date: 07-16-12
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914...Moving ahead just as planned.
WALL MOUNTED
PACKAGED
AIR CONDITIONER
INSTALLATION
INSTRUCTIONS
Models:
WA3S3 WL3S2
WA4S3 WL4S2
WA5S3 WL5S2
0,6
NOTE
THIS IS AN R-410A
HIGH PRESSURE
REFRIGERANT SYSTEM

Manual 2100-526E
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
For more information contact these publishers........ 3
Wall Mount General Information
Air Conditioner Wall Mount Model Nomenclature.... 4
Shipping Damage .................................................... 7
General ............................................................... 7
Duct Work ............................................................... 7
Filters ............................................................... 7
Condensate Drain.................................................... 7
Installation Instructions
Wall Mounting Information....................................... 8
Mounting the Unit .................................................... 8
Typical Installations ................................................. 8
Wiring – Main Power ....................................... 8 & 9
Wiring – Low Voltage Wiring ............................... 12
Start Up
General ............................................................. 13
Topping Off System Charge................................... 13
Safety Practices..................................................... 13
Important Installer Note ......................................... 14
Crankcase Heaters................................................ 14
High & 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
Troubleshooting
Compressor Solenoid ............................................ 17
Fan Blade Setting Dimensions .............................. 17
Removal of Fan Shroud......................................... 17
R-410A Refrigerant Charge ................................... 18
Pressure Chart ...................................................... 19
GE ECM™Motors................................................... 20
GE ECM™Motors................................................... 21
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 2100-526E
Page 3 of 24
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
ConditioningSystems
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 2100-526E
Page 4 of 24
WALL MOUNT GENERAL INFORMATION
AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE
WA 4S 3–B09 B P X X X X
TABLE 1
ELECTRIC HEAT TABLE
lanimoN WK )1(V042tA)1(V802tA)2(V084tA)2(V064tA
wKspmAhP-1spmAhP-3hutBwKspmAhP-1spmAhP-3hutBwKspmAhP-3hutBwKspmAhP-3hutB
0.50.58.02560,7157.30.81997,21
0.60.64.41874,0205.45.21953,510.62.7874,0225.59.6048,81
0.80.83.33403,7200.68.82874,02
0.90.97.12717,0357.67.81830,320.98.01717,0382.84.01062,82
0.010.017.14031,4305.71.63895,52
0.510.515.261.63591,1552.111.452.13693,830.510.81591,158.313.71990,74
0.020.023.38062,8600.511.27591,15
.ylnostinuV802/032nielbaliavaerasretaehcirtceleesehT)1( .ylnostinuV084nielbaliavaerasretaehcirtceleesehT)2(
See Table 3 for Heater Availability by Model
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)
V – Commercial Room Ventilator -
Motorized w/Exhaust (3-Position)
E – Economizer (Internal) - Fully
Modulating w/Exhaust
R – Energy Recovery Ventilator - w/Exhaust
COLOR OPTIONS
X – Beige (Standard)
4 – Buckeye Gray
5 – Desert Brown
8 – Dark Bronze
OUTLET OPTIONS
X – Front (Standard)
COIL OPTIONS
X – Standard
CONTROL MODULES
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
FILTER OPTIONS
P – Two Inch Pleated

Manual 2100-526E
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
LM
O
E
R
S
S
S
S
S
T
.44
NQ
P
B
TABLE 2
DIMENSIONSOFBASICUNITFORARCHITECTURAL & INSTALLATION REQUIREMENTS(NOMINAL)
tinU htdiWWhtpeD DthgieH H
ylppuSnruteR
EFGIJKLMNOPQRSTABCB
S3L/AW 
570.24234.22
578.48
88.988.9288.5188.9288.3401.91
66.13
00.03
86.2349.6296.4334.23
73.388.24
88.32
00.0144.100.6188.1S4L/AW 
578.4966.1486.2449.6396.4434.2488.33
S5L/AW 
All dimensions in inches. Dimensional Drawings are not to scale.
I
A
C
K
2.13
H
J
2.63
9.06
PML
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
FIGURE 1
UNITDIMENSIONS
1Dimension is 21.00 inches on WA/L4S2 & WA/L5S2 models.
WA*S*
RIGHT
UNIT
WL*S*
LEFT
UNIT

Manual 2100-526E
Page 6 of 24
ledoM detaR stloV esahPdna
dleiF.oN rewoP stiucriC
tiucriCelgniS tiucriCelpitluM
3muminiM tiucriC yticapmA
1mumixaM esuFlanretxE .rkrB.tkCro
2dleiF rewoP eziSeriW
2dnuorG eriW
3muminiM tiucriC yticapmA
1mumixaM esuFlanretxE .rkrB.tkCro
2dleiF rewoP eziSeriW
2dnuorG eriW
A.tkC B.tkC C.tkC A.tkC B.tkC C.tkC A.tkC B.tkC C.tkC A.tkC B.tkC C.tkC
S3L/AW Z0A- 50A- 80A- 01A- 51A- 02A-
1-802/032
1 1 12ro1 2ro1 3ro1
1353151678 311
5454060709 511
8 8 6 6 3 2
010101
8 8 6
535353
62252562
545454
03060603
8 8 8
01
6 601
010101
01010101
S3L/AW Z0B- 60B- 90B- 51B-
3-802/032
1 1 1 1
32726355
03030406
0101
8 6
01010101
S3L/AW Z0C- 60C- 90C- 51C-
3-064
1 1 1 1
21 5.31 9182
51510203
41412101
41412101
S4L/AW Z0A- 50A- 80A- 01A- 51A- 02A-
1-802/032
1 1 12ro1 2ro1 3ro1
8383353698 511
5454060709 021
8 8 6
4
3 2
010101
8 8 6
737373
62252562
545454
03060603
8 8 8
01
6 601
010101
01010101
S4L/AW Z0B- 60B- 90B- 51B-
3-802/032
1 1 1 1
82928365
04040406
0101
8 6
01010101
S4L/AW Z0C- 60C- 90C- 51C-
3-064
1 1 1 1
51611203
02025203
21210101
21210101
S5L/AW Z0A- 50A- 80A- 01A- 51A- 02A-
1-802/032
1 1 12ro1 2ro1 3ro1
4444353698 511
0505060709 021
8 8 6 6 3 2
010101
8 8 6
444444
62252562
050505
03060603
8 8 8
01
6 601
010101
01010101
S5L/AW Z0B- 60B- 90B- 51B-
3-802/032
1 1 1 1
43438365
04040406
8 8 8 6
01010101
S5L/AW Z0C- 60C- 90C- 51C-
3-064
1 1 1 1
71711203
52525203
01010101
01010101
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 the National Electric Code (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 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
ELECTRICALSPECIFICATIONS

Manual 2100-526E
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 2100-526E
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 INSTRUCTIONS
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 “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.
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 first 3 feet of duct can result in
fire.

Manual 2100-526E
Page 9 of 24
FIGURE 2
MOUNTINGINSTRUCTIONS
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.
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"
1
7
8
"6
1
2
" 6
1
2
"2
1
8
"
7
8
"
1" 3"
4"
Typ.
4"
Typ.
6
1
2
"30"
E
16"
A CC
3
1
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 1/2 10 1/2 6 1/4 1 1/4 29 3/4
32 12 5 1/2
TOP FOAM 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 2100-526E
Page 10 of 24
FIGURE 4
WALL-MOUNTINGINSTRUCTIONS
FIGURE 3
WALL-MOUNTINGINSTRUCTIONS
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
SEEFIGURE3 — MOUNTINGINSTRUCTIONS
SEEUNITDIMENSIONS,FIGURE1,
FORACTUALDIMENSIONS
SEEFIGURE1FOR
DUCTDIMENSIONS

Manual 2100-526E
Page 11 of 24
FIGURE 5
COMMONWALL-MOUNTINGINSTALLATIONS
LOWERED
RAISED FLOOR
RAFTERS
SUPPLY AIR
CEILING SURFACE
WALL SLEEVE
RETURN AIR
CLOSET WALL
GRILLE
FLASHING
RETURN AIR
FLASHING
SUPPLY DUCT MAYBE LOCATED IN AN ATTIC
OR BELOW CEILING RAFTERS AS SHOWN
SUPPLY DUCT MAY BE LOCATED IN AN ATTIC
SURFACE
RAFTERS
FINISHED CEILING
SUPPLY AIR DUCT
WALL
OPENING W/ GRILLE
SUPPLY DUCT MAYBE LOCATED IN AN ATTIC
OR BELOW CEILING RAFTERS AS SHOWN
CEILING
RAIN
RETURN AIR
SLEEVE
WALL
SUPPLY AIR DUCT
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 AIR DUCT
CLOSET INSTALLATION
RETURN AIR
FINISHED
FINISHED CEILING SURFACE
MIS-550 B
FREE AIR FLOW
OUTSIDE
WALL
OUTSIDE
WALL
SUPPLY AIR DUCT
W/ GRILLE

Manual 2100-526E
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
WALLTHERMOSTATS
TABLE 5
THERMOSTAT WIRE SIZE
remrofsnarT AV ALF eriW eguaG
mumixaM ecnatsiD teeFni
051.2
eguag02 eguag81 eguag61 eguag41 eguag21 5406 001 061 052
tatsomrehTserutaeFtnanimoderP
060-3048 )544-0211(
taeHegats3;looCegats3 cinortcelEelbammargorP-noN/elbammargorP lanoitnevnoCroPH revoegnahclaunaMrootuA
850-3048 )1511D0225HT(
taeHegats2;looCegats2 elbammargorP-noNcinortcelE revoegnahclaunaMrootuA
THERMOSTATICCONTROL
FOR DUAL UNIT APPLICATION
tatsomrehTserutaeFetanimoderPsnoitacificepSdraB
04CETlooCegatS-2/taeHegatS-2/tinU-2 rellortnoC 3533SteehS.cepSeeS
0003CM looCegatS-2/taeHegatS-2/tinU-2 smralAnoitpOhtiwrellortnoC 9733SteehS.cepSeeS
TABLE 4
OPERATINGVOLTAGERANGE
PATEGNAR
V042612-352
V802781-022
FIGURE 6
ELECTRIC HEAT CLEARANCE
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
first 3 feet of ducting.
• It is important to insure that the 1/4 inch
minimum spacing is maintained at all points.
• Failure to do this could result in overheating the
combustible material and may result in fire.

Manual 2100-526E
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 2100-526E
Page 14 of 24
START UP CONTINUED
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 & 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.
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.
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
See “Phase Monitor”, Page 16.
FIGURE 7
START-UPLABEL

Manual 2100-526E
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 2100-526E
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.
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 2100-526E
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.
TROUBLESHOOTING
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 reinstall.
TABLE 7
FAN BLADE DIMENSIONS
ledoMAnoisnemiD
S3L/AW 


S4L/AW 


S5L/AW 

 "57.1
"A"
AIRFLOW
MIS-1724

Manual 2100-526E
Page 18 of 24
TROUBLESHOOTING CONT’D.
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 2100-526E
Page 19 of 24
TABLE 8
COOLING PRESSURE – (ALL TEMPERATURES °F)
Lowside pressure ±4psig
Highside pressure ±10psig
GNILOOCYTICAPACHGIH FEERGEDLIOCROODTUOGNIRETNEERUTAREPMETRIA
LEDOM
RIANRUTER ERUTAREPMET
ERUSSERP 05
o
F 55
o
F 06
o
F 56
o
F 07
o
F 57
o
F 08
o
F 58
o
F 09
o
F 59
o
F 001
o
F 501
o
F 011
o
F 511
o
F
S3AW 
S3LW 
BD°57 BW°26 EDISWOL EDISHGIH 211 591 511 412 911 332 221 352 621 272 921 192 131 413 231 733 431 063 531 383 631 904 831 534 931 164 041 784
BD°08 BW°76 EDISWOL EDISHGIH 421 102 721 022 131 932 431 952 831 872 141 792 241 913 441 143 541 363 741 093 841 314 941 044 151 864 251 594
BD°58 BW°27 EDISWOL EDISHGIH 531 502 831 422 241 342 541 362 941 282 251 103 451 623 651 053 751 573 951 993 161 524 261 154 461 674 561 205
S4AW 
S4LW 
BD°57 BW°26 EDISWOL EDISHGIH 711 791 911 612 121 532 321 552 521 472 721 392 821 613 031 933 131 163 231 383 331 014 531 834 631 664 731 494
BD°08 BW°76 EDISWOL EDISHGIH 721 102 921 022 131 932 431 952 631 872 831 892 831 813 931 143 931 463 341 004 341 514 441 344 641 174 941 005
BD°58 BW°27 EDISWOL EDISHGIH 141 302 341 322 541 342 841 362 051 382 251 303 251 623 351 943 351 273 451 693 651 224 851 944 061 874 261 805
S5AW 
S5LW 
BD°57 BW°26 EDISWOL EDISHGIH 811 991 911 712 021 632 221 062 321 582 521 903 621 333 821 753 921 183 031 504 231 234 331 064 531 784 631 415
BD°08 BW°76 EDISWOL EDISHGIH 921 502 031 422 131 742 131 072 231 292 231 513 431 933 731 363 931 783 141 524 341 834 541 564 641 294 841 915
BD°58 BW°27 EDISWOL EDISHGIH 731 612 931 732 041 852 141 972 241 003 341 123 641 643 841 073 151 593 351 914 551 744 751 474 851 205 061 925
GNILOOCYTICAPACWOL FEERGEDLIOCROODTUOGNIRETNEERUTAREPMETRIA
LEDOM RIANRUTER ERUTAREPMET
ERUSSERP 05
o
F 55
o
F 06
o
F 56
o
F 07
o
F 57
o
F 08
o
F 58
o
F 09
o
F 59
o
F 001
o
F 501
o
F 011
o
F 511
o
F
S3AW 
S3LW 
BD°57 BW°26 EDISWOL EDISHGIH 621 181 721 891 921 512 031 332 231 052 331 762 531 982 631 013 831 233 931 353 141 873 441 404 641 924 841 454
BD°08 BW°76 EDISWOL EDISHGIH 731 481 831 102 931 812 141 632 241 352 341 072 541 192 741 213 941 333 151 453 351 083 551 604 651 234 851 854
BD°58 BW°27 EDISWOL EDISHGIH 351 091 451 702 551 422 651 142 751 852 851 572 061 792 261 813 361 043 561 163 761 783 861 314 071 834 171 464
S4AW 
S4LW 
BD°57 BW°26 EDISWOL EDISHGIH 221 481 421 102 521 812 721 632 921 452 131 272 131 192 231 213 331 533 431 953 531 183 731 704 931 534 141 364
BD°08 BW°76 EDISWOL EDISHGIH 231 581 431 302 631 122 831 932 041 752 241 572 541 892 641 713 741 933 841 263 941 483 051 014 151 834 251 764
BD°58 BW°27 EDISWOL EDISHGIH 541 781 741 502 941 322 251 142 451 952 651 872 651 793 751 913 851 343 951 963 161 093 361 514 461 344 561 274
S5AW 
S5LW 
BD°57 BW°26 EDISWOL EDISHGIH 321 781 521 702 721 622 921 542 131 362 331 282 431 503 531 823 631 053 731 373 931 993 141 524 341 154 541 774
BD°08 BW°76 EDISWOL EDISHGIH 431 291 631 112 831 032 931 842 141 762 341 682 541 803 741 133 941 353 151 573 351 204 551 924 651 654 851 384
BD°58 BW°27 EDISWOL EDISHGIH 641 002 841 712 941 532 151 252 251 072 451 782 651 113 951 533 161 853 361 283 561 804 661 434 861 064 961 684

Manual 2100-526E
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 filter reduce
high CFM (speed) “puffing”?
- Reduce restriction
- Reduce max airflow
• 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
Excessivenoise • Determine if it’s air noise, cabinet, duct or
motor noise; interview customer, if necessary
• Air noise • High static creating high blower speed?
- Is airflow set properly?
- Does removing filter cause blower to slow
down? Check filter
- Use low-pressure drop filter
- 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 filter reduce
high CFM (speed) “puffing”?
- Reduce restriction
- Reduce max. airflow
Evidence of Moisture
• Motor failure or • Replacemotorand
PerformMoisture 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 filters some have ½"
minimum: H20 drop!
- Recommend high • Use restricted returns
efficiency, low static filters
- Recommend keeping filters
clean.
- Design ductwork for min.
static, max. comfort
- Look for and recommend
ductwork improvement,
where necessary
• Size the equipmentwisely • Oversize system, then compensate with low
airflow
• Checkorientationbefore • 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 airflow (too much latent capacity)
• Check for undercharged condition
• Check and plug leaks in return ducts, cabinet
Comfort Check
• Check proper airflow 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?