Bard S26H1-B, S31H1-B, S26H1-C, S31H1-A, S31H1-C Installation Instructions Manual

INSTALLATION INSTRUCTIONS

WALL MOUNTED

PACKAGED HEAT PUMP

Models:

S26H1-A
S26H1-B
S26H1-C
S31H1-A
S31H1-B
S31H1-C
S38H1-A
S38H1-B
S38H1-C

S43H1-A
S43H1-B
S43H1-C
S49H1-A
S49H1-B
S49H1-C
S61H1-A
S61H1-B
S61H1-C

S26H1DA
S26H1DB
S26H1DC
S31H1DA
S31H1DB
S31H1DC
S38H1DA
S38H1DB
S38H1DC

S43H1DA
S43H1DB
S43H1DC
S49H1DA
S49H1DB
S49H1DC
S61H1DA
S61H1DB
S61H1DC

W26H1-A
W26H1-B
W26H1-C
W31H1-A
W31H1-B
W31H1-A
W38H1-A
W38H1-B
W38H1-C

W43H1-A
W43H1-B
W43H1-C
W49H1-A
W49H1-B
W49H1-C
W61H1-A
W61H1-B
W61H1-C

Refer to Supplemental Instruction 7960-593 (latest revision)

for dedicated dehumidification information.

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

www.bardhvac.com

Manual: 2100-527H
Supersedes: 2100-527G
Date: 7-28-15

Page 1 of 29

Contents

Getting Other Information and Publications 3

Wall Mount General Information

Wall Mount Model Nomenclature .............................. 4

Shipping Damage ..................................................... 4

General ................................................................. 4

Duct Work .................................................................5

Filters ................................................................. 5

Fresh Air Intake ......................................................... 5

Condensate Drain .................................................... 5

Installation Instructions

Wall Mounting Information ........................................6

Mounting the Unit ...................................................... 6

Placement ................................................................. 6

Clearances Required ................................................ 6

Minimum Clearances ................................................ 6

Wiring – Main Power ............................................... 13

Wiring – Low Voltage Wiring ................................... 13

Optional Outdoor T-Stat Applications ...................... 14

Figures

Figure 1 Fresh Air Damper Assembly ..................... 5

Figure 2 Unit Dimensions ....................................... 7

Figure 3A Mounting Instructions S/W26 & 31 ........... 8

Figure 3B Mounting Instructions S/W38, 43, 49 ....... 9

Figure 4 Electric Heat Clearance ......................... 10

Figure 5 Wall Mounting Instructions ..................... 11

Figure 6 Wall Mounting Instructions ..................... 11

Figure 7 Common Wall Mounting Installations ..... 12

Figure 8 Compressor Cutoff ................................. 14

Figure 9 Compressor Cutoff ................................. 14

Figure 10 Electric Heat Hold-Off Wiring .................15

Figure 11 Electric Heat Hold-Off Wiring .................15

Figure 12 Defrost Control Board ............................19

Figure 13 Fan Blade Setting ...................................22

Figure 14 Control Disassembly ..............................29

Figure 15 Winding Test ........................................... 29

Figure 16 Drip Loop ................................................29

Start Up

General ............................................................... 16

Topping Off System Charge .................................... 16

Safety Practices ...................................................... 16

Important Installer Note ........................................... 17

High & Low Pressure Switch ................................... 17

Three Phase Scroll Compressor ............................. 17

Phase Monitor ......................................................... 17

Condenser Fan Operation ...................................... 17

Service Hints ........................................................... 17

Sequence of Operation ........................................... 18

Pressure Service Ports ........................................... 18

Defrost Cycle .......................................................... 18

Troubleshooting

Solid State Heat Pump Control ............................... 20

Checking Temperature Sensor ............................... 21

Fan Blade Setting Dimensions ................................ 22

Removal of Fan Shroud .......................................... 22

R-410A Refrigerant Charge ....................................22

Troubleshooting GE ECM Motors ........................... 28

Troubleshooting GE ECM Motors ........................... 29

Tables

Table 1 Clearances Required ............................... 6

Table 2 Min. Clearances Required ........................ 6

Table 3 Troubleshooting......................................20

Table 4 Fan Blade Dimension ............................. 22

Table 5A Cooling Pressure .................................... 23

Table 5B Heating Pressure ................................... 23

Table 6A Cooling Pressure .................................... 24

Table 6B Heating Pressure ................................... 24

Table 7A Electrical Specications S**H ................. 25

Table 7B Electrical Specications W**H ................ 26

Table 8 Indoor Blower Performance ................... 27

Tables 9A Indoor Blower Performance S**H ........... 27

Tables 9B Indoor Blower Performance W**H .......... 27

Manual 2100-527H
Page 2 of 29

GETTING OTHER INFORMATION AND PUBLICATIONS

These publications can help you install the air

conditioner or heat pump. You can usually nd these

at your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.

National Electrical Code ....................... ANSI/NFPA 70

Standard for the Installation ............... ANSI/NFPA 90A

of Air Conditioning and Ventilating Systems

Standard for Warm Air ....................... ANSI/NFPA 90B

Heating and Air Conditioning Systems

Load Calculation for ......................... ACCA Manual J

Residential Winter and Summer Air Conditioning

Duct Design for Residential ............... ACCA Manual D

Winter and Summer Air Conditioning and Equipment
Selection

FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:

ACCA Air Conditioning Contractors of America
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: [phone]
Fax: [phone]

ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]

ASHRAE American Society of Heating, Refrigeration
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 2100-527H
Page 3 of 29

WALL MOUNT GENERAL INFORMATION

HEAT PUMP WALL MOUNT MODEL NOMENCLATURE

S 38 H 1 – A 10 X X X X X A

MODEL NUMBER

S - Blow Through

W - Draw Through

CAPACITY |

26 - 2 Ton
31 - 2½ Ton
38 - 3 Ton
43 - 3½ Ton
49 - 4 Ton
61 - 5 Ton

NOTE: Vent options X, B and M are without exhaust capability. May require separate eld supplied barometric relief in building.

S**H Ventilation Option only.
W**H Ventilation Option only.

H - Heat Pump

VENTILATION OPTIONS

X - Barometric Fresh Air Damper (Standard)
B - Blank-off Plate
M - Motorized Fresh Air Damper
V - Commercial Ventilator - Motorized with Exhaust 
E - Economizer (Internal) - Fully Modulating with Exhaust 
R - Energy Recovery Ventilator - Motorized with Exhaust
(See Spec. Sheet S3398)
A - Manual Fresh Air Damper 
H - Commercial Ventilator - Motorized with Exhaust 

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.

REVISIONS

VOLTS & PHASE

A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3

KW
0Z - 0KW
04 - 4KW
05 - 5KW
06 - 6KW
08 - 8KW
09 - 9KW
10 -10KW
15 -15KW
20 -20KW

COLOR OPTIONS

X - Beige (Standard)
1 - White
4 - Buckeye Gray
5 - Desert Brown
8 - Dark Bronze

FILTER OPTIONS

X - One Inch Throwaway (Standard)
W - One Inch Washable
P - Two Inch Pleated

OUTLET OPTIONS

X - Front (Standard)

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.

CONTROL MODULES

(See Spec. Sheets
S3416 & S3417)

COIL OPTIONS

X - Standard
1 - Phenolic Coated Evaporator
2 - Phenolic Coated Condenser
3 - Phenolic Coated Evaporator
and Condenser

While these instructions are intended as a general

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.

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/gain calculation made according
to methods of Air Conditioning Contractors of
America (ACCA). The air duct should be installed
in accordance with the Standards of the National
Fire Protection Association for the Installation of Air
Conditioning and Ventilating Systems of Other Than
Residence Type, NFPA No. 90A, and Residence Type
Warm Air Heating and Air Conditioning Systems,
NFPA No. 90B. Where local regulations are at a
variance with instructions, installer should adhere to
local codes.

Manual 2100-527H
Page 4 of 29

DUCT WORK

All duct work, supply and return, must be properly

sized for the design airow 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.

Design the duct work according to methods given by
the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should be
insulated with a minimum of one inch of insulation.
Use insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect the
duct work to the equipment in order to keep the noise
transmission to a minimum.

A 1/4 inch clearance to combustible material for the

rst three feet of duct attached to the outlet air frame is

required. See Wall Mounting Instructions and Figures
3A, 3B and 4 for further details.

Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture entering the
wall cavity.

Some installations may not require any return air duct. A
metallic return air grille is required with installations not
requiring a return air duct. The spacing between louvers
on the grille shall not be larger than 5/8 inch.

FILTERS

A 1-inch throwaway lter is standard with each unit.
The lter slides into position making it easy to service.
This lter can be serviced from the outside by removing
the lter access panel. A 1-inch washable lter and
2-inch pleated lter are also available as optional
accessories. The internal lter brackets are adjustable
to accommodate the 2-inch lter by bending two (2)
tabs down on each side of the lter support bracket.

FRESH AIR INTAKE

All units are built with fresh air inlet slots punched in
the service door.

If the unit is equipped with a fresh air damper assembly,
the assembly is shipped already attached to the unit.
The damper blade is locked in the closed position.
To allow the damper to operate, the maximum and
minimum blade position stops must be installed. See
Figure 1.

All capacity, efciency and cost of operation

information is based upon the fresh air blank-off plate
in place and is recommended for maximum energy

efciency.

The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.

Any grille that meets with 5/8 inch louver criteria may be
used. It is recommended that Bard Return Air Grille Kit
RG2 through RG5 or RFG2 through RFG5 be installed
when no return duct is used. Contact distributor or
factory for ordering information. If using a return air

lter grille, lters must be of sufcient 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.

FIGURE 1

FRESH AIR DAMPER

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.

Manual 2100-527H
Page 5 of 29

INSTALLATION INSTRUCTIONS

WALL MOUNTING INFORMATION

1. Two holes for the supply and return air openings
must be cut through the wall as shown in Figure 3.

2. On wood frame walls, the wall construction must be
strong and rigid enough to carry the weight of the
unit without transmitting any unit vibration.

3. Concrete block walls must be thoroughly inspected
to insure that they are capable of carrying the
weight of the installed unit.

MOUNTING THE UNIT

1. These units are secured by wall mounting brackets
which secure the unit to the outside wall surface at
both sides. A bottom mounting bracket, attached
to skid for shipping, is provided for ease of
installation, but is not required.

2. The unit itself is suitable for 0 inch clearance,

but the supply air duct ange and the rst 3 feet

of supply air duct require a minimum of 1/4 inch
clearance to combustible material. However, it is
generally recommended that a 1-inch clearance is
used for ease of installation and maintaining the
required clearance to combustible material. See
Figure 3 for details on opening sizes.

3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figures 3A & 3B.

4. Mount bottom mounting bracket.

5. Hook top rain ashing, attached to front - right of
supply ange for shipping, under back bend of top.

6. Position unit in opening and secure with 5/16 lag bolts;

use 7/8 inch diameter at washers on the lag bolts.

7. Secure rain ashing to wall and caulk across entire

length of top. See Figures 3A & 3B.

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 causing damage, injury or death.

PLACEMENT

1. On side-by-side installations, maintain a minimum
of 20 inches clearance on right side to allow access
to control panel and heat strips, and to allow proper

airow to the outdoor coil. Additional clearance

may be required to meet local or national codes.

2. Care should be taken to ensure that the recirculation
and obstruction of condenser discharge air does
not occur. Recirculation of condenser discharge
air can be from either a single unit or multiple
units. Any object such as shrubbery, a building
or a large object can cause obstructions to the
condenser discharge air. Recirculation or reduced

airow caused by obstructions will result in reduced

capacity, possible unit pressure safety lockouts and
reduced unit service life.

Units with a blow through condenser, such as

the S**H 10 EER units, it is recommended that
a minimum distance of 15 feet between the front
of the unit and any barrier or 20 feet between the
fronts of two opposing (facing) units.

Units with a draw through condenser, such as the

W**H 10 EER units, it is recommended that a
minimum distance of 10 feet between the front of
the unit and any barrier or opposing (facing) unit.

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.

Clearances Required for Service Access

and Adequate Condenser Airow

MODELS LEFT SIDE RIGHT SIDE

S26H, S31H
W26H, W31H

S38H, S43H, S49H, S61H
W38H, W43H, W49H, W61H

Manual 2100-527H
Page 6 of 29

15" 20"

20" 20"

Minimum Clearances Required to
Combustible Materials

MODELS

S26H, S31H
W26H, W31H

S38H, S43H, S49H, S61H
W38H, W43H, W49H, W61H

SUPPLY AIR
DUCT FIRST

THREE FEET

1/4" 0

1/4" 0

CABINET

Panel

Filter Access

Vent Option
Door

Ventilation
Air

Front View

5.75

F

W

G

Condenser

Air Inlet

MIS-2763

Rain Hood

(Lockable)

Built In

4° Pitch

Entrance

Disconnect

Access Panel

Electrical

Entrance

Low Voltage

Panel

Access

Heater

Heat

Electric

C. Breaker/

High Voltage

Electrical

Drain

Side View

J

K

D

A

C H

2.13

I

Cond.

Air

Outlet

Mounting

(Built In)

Side Wall

Location

Brackets

Shipping

Entrances

Return Air Opening

Electrical

Supply Air Opening

Optional

Top Rain

Flashing

Bottom Installation
Bracket

Back View

S2

T

.44

N

Q

P

M

L

O

E

R

S1

S1

S1

S2

B

FIGURE 2

Dimensions of Basic Unit for Architectural and Installation Requirements (Nominal)

WIDTH

DEPTH

MODEL

S26H1
S31H1
W26H1
W31H1

S38H1
S43H1
S49H1
W38H1
W43H1
W49H1

S61H1
W61H1

(W)

38.200 17.125 70.563 7.88 27.88 13.88 27.88 40.00 10.88 25.75 17.93 26.75 28.75 29.25 27.00 2.63 39.13 22.75 9.14 4.19 12.00 12.00 5.00

42.075 22.432 84.875 9.88 29.88 15.88 29.88 43.88 13.56 31.66 30.00 32.68 26.94 34.69 32.43 3.37 43.00 23.88 10.00 1.44 16.00 16.00 1.88

42.075 22.432 94.875 9.88 29.88 15.88 29.88 43.88 13.56 41.66 30.00 42.68 36.94 44.69 42.43 3.37 43.00 33.88 10.00 1.44 16.00 21.00 1.88

HEIGHT

(D)

All dimensions are in inches. Dimensional drawings are not to scale.

SUPPLY RETURN

(H)

A B C B E F G I J K L M N O P Q R S1 S2 T

S**H & W**H
RIGHT UNIT

Manual 2100-527H
Page 7 of 29

D

12"

12"

12"

12"

12"

C CA

28"

1"

3"

4"

Typ.

4

1

2

"

B

E

14"

1"

3

1

8

"

4"

Typ.

5"

4

1

2

"

7

8

"

RETURN AIR

SUPPLIED

Return Opening

16 7/84 9/164 1/21030

17 5/83 13/165 1/48 1/228 1/2

EDCBA

COMBUSTIBLE MATERIALS

RECOMMENDED 1" CLEARANCE FROM

REQUIRED DIMENSIONS TO MAINTAIN

THE SIDE MOUNTING FLANGES AND UNDER

1/4" CLEARANCE ON ALL

RAIN FLASHING

COMBUSTIBLE MATERIALS

DUCT

TOP FLASHING AT TIME OF INSTALLATION.

1/4" MIN. CLEARANCE FROM

REQUIRED DIMENSIONS TO MAINTAIN

OPENING

ENTIRE LENGTH OF TOP.

MATERIALS

NOTES:

OF CAULKING ALONG

PANEL

FOAM AIR SEAL

FOUR SIDES OF SUPPLY

AIR DUCT IS REQUIRED

FROM COMBUSTABLE

WALL STRUCTURE

TOP

MIS-311 C

Wall Opening and Hole Location View Right Side View

WALL

HEATER ACCESS

SEAL WITH BEAD

IT IS RECOMMENDED THAT A BEAD OF

SILICONE CAULKING BE PLACED BEHIND

SUPPLY AIR

Supply Opening

W*R UNIT SHOWN, W*L UNIT

CONTROLS AND HEATER ACCESS

IS ON OPPOSITE (LEFT) SIDE.

FIGURE 3A

MOUNTING INSTRUCTIONS

S26H1, S31H1, W26H1, W31H1

Manual 2100-527H
Page 8 of 29

D

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

"

B

Wall Opening and Hole Location View

RETURN AIR

1

REQUIRED DIMENSIONS TO MAINTAIN

1/4" MIN. CLEARANCE FROM

COMBUSTIBLE MATERIALS

REQUIRED DIMENSIONS TO MAINTAIN

29

DUCT

COMBUSTIBLE MATERIALS

A B C DE

30 1/2

10 1/2

6 1/4 1 1/4 29 3/4

32 12 5 1/2

2

NOTES:

WALL STRUCTURE

1

SUPPLY AIR

IT IS RECOMMENDED THAT A BEAD OF

OPENING

Right Side View

RAIN FLASHING

SILICONE CAULKING BE PLACED BEHIND

RECOMMENDED 1" CLEARANCE FROM

THE SIDE MOUNTING FLANGES AND UNDER

TOP FLASHING AT TIME OF INSTALLATION.

TOP.

PANEL

HEATER ACCESS

FOUR SIDES OF SUPPLY

AIR DUCT IS REQUIRED

FROM COMBUSTABLE

WALL

1/4" CLEARANCE ON ALL

MATERIALS

Supply Opening

FOAM AIR SEAL

SUPPLIED

SEAL WITH BEAD

OF CAULKING ALONG

ENTIRE LENGTH OF

TOP

1

Return Opening

MIS-416 E

Dimension is 21" on 95" tall units.

2

Dimension is 10" on T48H1 & T60H1.

2

Dimension is 6" on T48H1 & T60H1.

3

3

FIGURE 3B

MOUNTING INSTRUCTIONS

S38H1, S43H1, S49H1, W38H1, W43H1, W49H1

Manual 2100-527H
Page 9 of 29

FIGURE 4

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 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 a re causing damage, injury or death.

Manual 2100-527H
Page 10 of 29

FIGURE 5

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 STEEL SIDING

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

WALL MOUNTING INSTRUCTIONS

SEE FIGURE 3 – MOUNTING INSTRUCTIONS

FIGURE 6

WALL MOUNTING INSTRUCTIONS

Manual 2100-527H
Page 11 of 29

FIGURE 7

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

COMMON WALL MOUNTING INSTALLATIONS

Manual 2100-527H
Page 12 of 29

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 eld wiring

used must be sized to carry that amount of current.
Depending on the installed KW of electric heat, there

may be two eld 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 (75°C
copper) for all models including the most commonly

used heater sizes. Also shown are the number of eld

power circuits required for the various models with
heaters.

The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or “HACR” type circuit breaker that is to
be used with the equipment. The correct size must be
used for proper circuit protection and also to assure that
there will be no nuisance tripping due to the momentary
high starting current of the compressor motor.

WIRING – LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment dual primary
voltage transformers. All equipment leaves the factory
wired on 240V tap. For 208V operation, reconnect
from 240V to 208V tap. The acceptable operating
voltage range for the 240 and 208V taps are:

TAP RANGE

240 253 – 216
208 220 – 187

NOTE: Thevoltageshouldbemeasuredattheeld

power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).

For wiring size and connections, refer to Wiring
Manual 2100-516.

The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
convert for the locking capability, bend the tab located
in the bottom left-hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.

See “Start Up” section for important information on
three phase scroll compressor start ups.

See Tables 7A & 7B for Electrical Specications.

Manual 2100-527H
Page 13 of 29

FIGURE 8

COMPRESSOR CUTOFF THERMOSTAT WIRING

4 – 10KW 1 PH – 6 & 9KW 3 PH

FIGURE 9

COMPRESSOR CUTOFF THERMOSTAT WIRING

15 – 20KW 1 PH AND 3 PH

OPTIONAL OUTDOOR THERMOSTAT
APPLICATIONS

Since most equipment at the time of manufacture is not

designated for any specic destination of the country

and are installed in areas not approaching the lower
outdoor temperature range, outdoor thermostats are not
factory installed as standard equipment, but are offered
as an option. There are also different applications for
applying outdoor thermostats. The set point of either
type of outdoor thermostat application is variable with
geographic region and sizing of the heating equipment
to the individual structure. Utilization of the heating
Application Data, and the heat loss calculation of the
building are useful in determining the correct set points.

NOTE: The additional LAB (low ambient bypass) relay
is required to prevent heater operation during low
temperature cooling operation.

Manual 2100-527H
Page 14 of 29

OPTIONAL COMPRESSOR CUTOFF
THERMOSTAT (See Figures 8 & 9)

Heat pump compressor operation at outdoor
temperatures below 0°F are neither desirable nor

advantageous in term of efciency. An outdoor

thermostat can be applied to take the mechanical
heating (compressor) off line, and send the
(compressor) signal to energize electric heat in its place

(to make electric heat rst stage heating). This can also

be applied to bank the quantity of available electric
heat. For example: A heat pump operates with 10KW
second stage heat – once the outdoor thermostat has
switched then operates 15KW without the compressor

as rst stage heat.

ELECTRIC HEAT HOLD-OFF
(See Figures 10 & 11)

In other applications, it is desirable to disable the
operation of the electric heat until outdoor temperatures
have reached a certain design point. This won't allow
the electric heat to come on as second stage heating
unless the outdoor temperature is below the set point
of the outdoor thermostat. This is done to maximize

FIGURE 10

ELECTRIC HEAT HOLD-OFF WIRING

4 – 10KW 1 PH — 6 & 9KW 3 PH

efciency by utilizing the heat pump to bring the

conditioned space temperature up, rather than cycling
on the electric heat due a second stage call for heat
from the thermostat on start-up coming off a night set­back condition or someone increasing the thermostat
set point. (NOTE: Some programmable thermostats
do have a built-in time delay for pulling in second stage
heat when coming off set-back conditions.)

FIGURE 11

ELECTRIC HEAT HOLD-OFF WIRING

15 – 20KW 1 PH & 3 PH

Manual 2100-527H
Page 15 of 29

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. Polyol Ester 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. If done correctly, topping off the system charge
can be done without problems.

With R-410A, there are no signicant 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.

WARNING

Failure to conform to these practices
could lead to damage, injury or death.

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 ammable.

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 ll 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 signicantly

at warmer temperatures. Once a cylinder or line is
full of liquid, any further rise in temperature will
cause it to burst.

Manual 2100-527H
Page 16 of 29

START UP (Continued)

IMPORTANT INSTALLER NOTE

For improved start up performance wash the indoor coil
with a dish washing detergent.

HIGH & LOW PRESSURE SWITCH

All S**H and W**H wall mounted air conditioner series
models are supplied with a remote reset for the high 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, verication of proper rotation must be made.
Verication of proper rotation direction is made by

observing that suction pressure drops and discharge
pressure rises when the compressor is energized.
Reverse rotation also results in an elevated sound level
over that with correct rotation, as well as substantially
reduced current draw compared to tabulated values.

Verication of proper rotation must be made at the
time the equipment is put into service. If improper
rotation is corrected at this time, there will be no
negative impact on the durability of the compressor.
However, reverse operation for over one hour may have
a negative impact on the bearing due to oil pump out.

NOTE: If compressor is allowed to run in reverse

rotation for several minutes, the compressor’s
internal protector will trip.

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.

CONDENSER FAN OPERATION

Applies to S38, S43, S49, S61 & W38, W43, W49, W61
models only. The condenser fan motor on 230/208

volt, one and three phase, 60 HZ units is a two-speed
motor that comes factory wired on high speed for peak
performance. If ambient conditions permit, it can be
reconnected to low speed (red wire) for lower sound
level. See wiring diagram.

50 HZ models must have fan wired on low speed.
These models are factory wired on low speed.

SERVICE HINTS

1. Caution owner/operator to maintain clean air

lters at all times. Also, not to needlessly close off
supply and return air registers. This reduces airow

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 airow circulation is essential.

All three phase ZP compressors are wired identically
internally. As a result, once the correct phasing

is determined for a specic system or installation,

connecting properly phased power leads to the same
Fusite terminal should maintain proper rotation
direction.

The direction of rotation of the compressor may be
changed by reversing any two line connections to the
unit.

Manual 2100-527H
Page 17 of 29

SEQUENCE OF OPERATION

COOLING – Circuit R-Y makes at thermostat pulling in

compressor contactor, starting the compressor and outdoor
motor. The G (indoor motor) circuit is automatically
completed on any call for cooling operation or can be
energized by manual fan switch on subbase for constant air
circulation.

HEATING – A 24V solenoid coil on reversing valve
controls heating cycle operation. Two thermostat options,
one allowing “Auto” changeover from cycle to cycle and
the other constantly energizing solenoid coil during heating
season, and thus eliminating pressure equalization noise
except during defrost, are to be used. On “Auto” option
a circuit is completed from R-B and R-Y on each heating
“on” cycle, energizing reversing valve solenoid and pulling
in compressor contactor starting compressor and outdoor
motor. R-G also make starting indoor blower motor. Heat
pump heating cycle now in operation. The second option
has no “Auto” changeover position, but instead energizes
the reversing valve solenoid constantly whenever the
system switch on subbase is placed in “Heat” position,
the “B” terminal being constantly energized from R. A
Thermostat demand for heat completes R-Y circuit, pulling
in compressor contactor starting compressor and outdoor
motor. R-G also make starting indoor blower motor.

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. See Tables 5A & 5B.

If some abnormal or temporary condition such as a high
wind causes the heat pump to have a prolonged defrost
cycle, the heat pump control will restore the system to
heating operation automatically after 8 minutes.

The heat pump defrost control board has an option of 30, 60
or 90-minute setting. By default, this unit is shipped from
the factory with the defrost time on the 60 minute pin. If
circumstances require a change to another time, remove
the wire from the 60-minute terminal and reconnect to the
desired terminal. Refer to Figure 12.

There is a cycle speed up jumper on the control. This can be
used for testing purposes to reduce the time between defrost
cycle operation without waiting for time to elapse.

Use a small screwdriver or other metallic object, or another
¼ inch QC, to short between the SPEEDUP terminals to
accelerate the HPC timer and initiate defrost.

Be careful not to touch any other terminals with the instrument
used to short the SPEEDUP terminals. It may take up to
10 seconds with the SPEEDUP terminals shorted for the
speedup to be completed and the defrost cycle to start.

As soon as the defrost cycle kicks in remove the shorting
instrument from the SPEEDUP terminals. Otherwise the

timing will remain accelerated and run through the 1-minute
minimum defrost length sequence in a matter of seconds and
will automatically terminate the defrost sequence.

There is an initiate defrost jumper (sen jump) on the control
that can be used at any outdoor ambient during the heating
cycle to simulate a 0° coil temperature.

This can be used to check defrost operation of the unit
without waiting for the outdoor ambient to fall into the
defrost region.

DEFROST CYCLE

The defrost cycle is controlled by temperature and time on
the solid state heat pump control.

When the outdoor temperature is in the lower 40°F
temperature range or colder, the outdoor coil temperature is
32°F or below. This coil temperature is sensed by the coil
temperature sensor mounted near the bottom of the outdoor
coil. Once coil temperature reaches 30°F or below, the
coil temperature sensor sends a signal to the control logic
of the heat pump control and the defrost timer will start
accumulating run time.

After 30, 60 or 90 minutes of heat pump operation at 30°F
or below, the heat pump control will place the system in the
defrost mode.

During the defrost mode, the refrigerant cycle switches back
to the cooling cycle, the outdoor motor stops, electric heaters
are energized, and hot gas passing through the outdoor coil
melts any accumulated frost. When the temperature rises to
approximately 57°F, the coil temperature sensor will send a
signal to the heat pump control which will return the system
to heating operations automatically.

Manual 2100-527H
Page 18 of 29

By placing a jumper across the SEN JMP terminals (a
¼ inch QC terminal works best) the defrost sensor mounted
on the outdoor coil is shunted out & will activate the timing
circuit. This permits the defrost cycle to be checked out in
warmer weather conditions without the outdoor temperature
having to fall into the defrost region.

In order to terminate the defrost test the SEN JMP jumper
must be removed. If left in place too long, the compressor
could stop due to the high pressure control opening because
of high pressure condition created by operating in the
cooling mode with outdoor fan off. Pressure will rise fairly
fast as there is likely no actual frost on the outdoor coil in

this articial test condition.

There is also a 5-minute compressor time delay function built
into the HPC. This is to protect the compressor from short
cycling conditions. The board’s LED will have a fast blink
rate when in the compressor time delay. In some instances,
it is helpful to the service technician to override or speed up
this timing period, and shorting out the SPEEDUP terminals
for a few seconds can do this.

120*

SW1SW

2 TIME (SEC)

OFF
OFF

ON
ON

OFF

ON

OFF

ON

30
60

180

MIS-2668 A

OFF

LOW PRESSURE BYPASS TIMER SWITCH
*(FACTORY SETTING 120 SECONDS)

ACCUMULATED DEFROST TIME TIMER
(FACTORY SETTING 60 MIN.)

ON

Low Pressure Switch Bypass Operation - The control has a
selectable (SW1) low pressure switch bypass set up to ignore

the low pressure switch input during the rst (30, 60, 120 or

180 seconds) of “Y” operation.

After this period expires, the control will then monitor the low
pressure switch input normally to make sure that the switch is
closed during “Y” operation.

High Pressure Switch Operation - The control has a built-in
lockout system that allows the unit to have the high pressure

FIGURE 12

DEFROST CONTROL BOARD

switch trip up to two times in one hour and only encounter
a “soft” lockout. A “soft” lockout shuts the compressor off
and waits for the pressure switch to reset, which at that point
then allows the compressor to be restarted as long as the
5-minute short cycle timer has run out. If the high pressure
switch trips a third time within one hour, the unit is in “hard”
lockout indicating something is certainly wrong and it will
not restart itself.

Manual 2100-527H
Page 19 of 29

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE

1. NOTE: A thorough understanding of the defrost
cycle sequence is essential. Review that section

NOTE: If there was no power to 24 volt transformer,
the compressor and outdoor fan motor will
not start for 5 minutes. This is because of
the compressor short cycle protection.

earlier in this manual prior to troubleshooting the
control. Turn on AC power supply to unit.

2. Turn thermostat blower switch to “fan on” – the
indoor blower should start. (If it doesn’t,
troubleshoot indoor unit and correct problem.)

3. Turn thermostat blower to “auto” position. Indoor
blower should stop. NOTE: Many models have a

1-minute blower time delay on “off” command;
wait for this to time-out.

4. Set system switch to “heat” or “cool”. Adjust
thermostat to call for heat or cool. The indoor
blower, compressor and outdoor fan should start.

BLINK FUNCTION

Slow Normal function (1.0 sec on/1.0 sec off)
Fast ASCD (Compressor Delay) timer active
(0.1 sec on/0.1 sec off)
1 Low pressure switch failure
2 High pressure switch failure/“Soft” Lockout
3 Defrost mode active
4 High pressure switch failure/“Hard” Lockout

TABLE 3

TROUBLESHOOTING

Sympton Description, Check & Possible Cause What & How to Check/Repair

Compressor will
not start (heating or
cooling)

Fan outdoor
motor does not run
(cooling or heating
except during
defrost)

Reversing valve
does not energize
(heating only)

Unit will not go into
defrost (heating
only)

Unit will not come
out of defrost
(heating only)

1. Check for LED illumination.

Is there an LED illuminated on the board

(ashing)?

2. Check for error codes.

Is the LED ashing a code?

3. Check for power at board.

Is there 24 volts AC between R and C?

4. Check codes.

What code is blinking?

5. Compressor delay active.

Wait for 5 minute delay or jump board's

"speed up pins".

6. Low pressure fault. Check wiring circuit and unit pressures.

7. High pressure fault. Check wiring circuit and unit pressures.

8. Check for Compressor input signal.

Is there 24 volts AC between Y and C?

9. No power to board.

10. Check for Compressor output signal.

Is there 24 volts AC between CC and C?

11. No "Y" compressor input signal.

12. No "CC" compressor output signal. Check compressor contactor for proper operation and nally check compressor.

13. Faulty board. Replace defrost board.

Heat pump control defective

Motor defective Check for open or shorted motor winding. Replace motor.

Motor capacitor defective Check capacitor rating. Check for open or shorted capacitor. Replace capacitor.

Heat pump control defective

Reversing valve solenoid coil defective

Temperature sensor or heat pump control
defective

Temperature sensor or heat pump control
defective

Yes = go to Step #2; No = go to Step #3

Yes = go to Step #4; No = go to Step #8

Yes = go to Step #13; No = go to Step #9

Code "1", got to Step #6; Code "2", go to Step #7; Fast Blink, go to Step #5

Check for proper operation; if still needed, go back to Step #1

Yes = go to Step #10; No = go to Step #11

The unit either does not have unit voltage, the transformer is bad or the unit wiring
is incorrect.

Yes = go to Step #12; No = go to Step #13

Check thermostat wiring, incorrect phase of unit (see section on Phase Monitor)

and nally unit wiring.

Check across fan relay on heat pump control. (Com-NC)
Replace heat pump control.

Check for 24 V between RV-C and B-C.

1. Check circuit control wiring.

2. Replace heat pump control.

Check for open or shorted coil.
Replace solenoid coil.

Disconnect temperature sensor from board and jumper across "SPEEDUP"

terminals and "SEN JMP" terminals. This should cause the unit to go through a
defrost cycle within one minute.

1. If unit goes through defrost cycle, replace temperature sensor.

2. If unit does not go through defrost cycle, replace heat pump control.

Jumper across "SPEEDUP" terminal. This should cause the unit to come out of
defrost within one minute.

1. If unit goes through defrost cycle, replace temperature sensor.

2. If unit does not go through defrost cycle, replace heat pump control.

LED BLINK CODES

Manual 2100-527H
Page 20 of 29

CHECKING TEMPERATURE SENSOR
OUTSIDE UNIT CIRCUIT

1. Disconnect temperature sensor from board and
from outdoor coil.

2. Use an ohmmeter and measure the resistance of the
sensor. Also use ohmmeter to check for short or
open.

TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSOR

F R F R F R F R

-25.0 196871 13.0 56985 53.0 19374 89.0 7507

-24.0 190099 14.0 55284 52.0 18867 90.0 7334

-23.0 183585 15.0 53640 53.0 18375 91.0 7165

-22.0 177318 16.0 52051 54.0 17989 92.0 7000

-21.0 171289 17.0 50514 55.0 17434 93.0 6840

-20.0 165487 18.0 49028 56.0 16984 94.0 6683

-19.0 159904 19.0 47590 57.0 16547 95.0 6531

-18.0 154529 20.0 46200 58.0 16122 96.0 6383

-17.0 149355 21.0 44855 59.0 15710 97.0 6239

-16.0 144374 22.0 43554 60.0 15310 98.0 6098

-15.0 139576 23.0 42295 61.0 14921 99.0 5961

-14.0 134956 24.0 41077 62.0 14544 100.0 5827

-13.0 130506 25.0 39898 63.0 14177 101.0 5697

-12.0 126219 26.0 38757 64.0 13820 102.0 5570

-11.0 122089 27.0 37652 65.0 13474 103.0 5446

-10.0 118108 28.0 36583 66.0 13137 104.0 5326

-9.0 114272 29.0 35548 67.0 12810 105.0 5208

-8.0 110575 30.0 34545 68.0 12492 106.0 5094

-7.0 107010 31.0 33574 69.0 12183 107.0 4982

-6.0 103574 32.0 32634 70.0 11883 108.0 4873

-5.0 100260 33.0 31723 71.0 11591 109.0 4767

-4.0 97064 34.0 30840 72.0 11307 110.0 4663

-3.0 93981 35.0 29986 73.0 11031 111 . 0 4562

-2.0 91008 36.0 29157 74.0 10762 112.0 4464

-1.0 88139 37.0 28355 75.0 10501 113.0 4367

0.0 85371 38.0 27577 76.0 10247 114.0 4274

1.0 82699 39.0 26823 77.0 10000 115.0 4182

2.0 80121 40.0 26092 78.0 9760 116.0 4093

3.0 77632 41.0 25383 79.0 9526 117.0 4006

4.0 75230 42.0 24696 80.0 9299 118.0 3921

5.0 72910 43.0 24030 81.0 9077 119.0 3838

6.0 70670 44.0 23384 82.0 8862 120.0 3757

7.0 68507 45.0 22758 83.0 8653 121.0 3678

8.0 66418 46.0 22150 84.0 8449 122.0 3601

9.0 64399 47.0 21561 85.0 8250 123.0 3526

10.0 62449 48.0 20989 86.0 8057 124.0 3452

11.0 60565 49.0 20435 87.0 7869

12.0 58745 50.0 19896 88.0 7686

3. Check resistance reading to chart of resistance. Use
sensor ambient temperature. (Tolerance of part is
± 10%.)

4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the
heat pump control.

5. If sensor is out of tolerance, shorted, open or reads
very low ohms then it should be replaced.

Manual 2100-527H
Page 21 of 29

TROUBLESHOOTING

"A"

S**H AIRFLOW

W**H AIRFLOW

MIS-2725 A

FAN BLADE SETTING DIMENSIONS

Shown in Figure 13 is the correct fan blade setting for
proper air delivery across the outdoor coil. Refer to

Table 4 for unit specic dimension.

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.

FIGURE 13

FAN BLADE SETTING

TABLE 4

FAN BLADE DIMENSION

Model Dimension A

W26H1
W31H1
W38H1
W43H1
W49H1
W61H1

S26H1
S31H1

S38H1
S43H1
S49H1
S61H1

1.00"

1.25"

1.75"

REMOVAL OF FAN SHROUD

1. Disconnect all power to the unit.

2. Remove the screws holding both grilles, one on
each side of unit, and remove grilles.

3. Remove screws holding fan shroud to condenser
and bottom. Nine (9) screws.

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.

R-410A

REFRIGERANT CHARGE

This unit was charged at the factory with the quantity of
refrigerant listed on the serial plate. AHRI capacity and

efciency ratings were determined by testing with this

refrigerant charge quantity.

The following pressure tables show nominal pressures

for the units. Since many installation specic situations

can affect the pressure readings, this information should

only be used by certied 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 2100-527H
Page 22 of 29

Model

S26H1

S31H1

S38H1

S43H1

S49H1

S61H1

Return Air

Temperature

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

TABLE 5A

COOLING PRESSURE TABLE

Pressure 75 80 85 90 95 100 105 110 115 120

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

Low SIde
High Side

129
298

133
306

143
317

122
312

130
320

135
331

125
314

134
322

139
333

128
329

137
337

142
349

131
338

140
347

145
359

122
336

131
345

136
357

130
320

134
328

144
339

124
329

133
337

138
349

127
332

136
340

141
352

130
343

139
352

144
364

131
355

140
364

145
377

123
353

132
362

137
375

131
342

135
351

145
363

126
347

135
356

140
368

129
351

138
360

143
373

132
361

141
370

146
383

132
372

141
382

146
395

125
371

134
381

139
394

132
366

136
375

145
388

129
368

136
377

143
390

131
371

140
381

145
394

134
381

143
391

148
405

133
392

142
402

147
416

126
392

135
402

140
416

133
390

137
397

147
414

131
390

137
405

145
414

133
394

141
400

147
418

137
404

144
413

151
428

134
413

142
421

148
439

128
416

137
427

142
442

Air Temperature Entering Outdoor Coil °F

134
414

143
425

148
440

133
413

142
424

147
439

135
417

144
428

149
443

138
429

148
440

153
455

136
437

145
448

150
464

130
442

139
453

144
469

135
440

144
451

149
467

135
439

144
450

149
466

137
442

146
453

151
469

140
457

150
469

155
485

137
461

147
473

152
490

132
470

141
482

146
499

137
466

146
478

151
495

137
466

146
478

151
495

138
468

148
480

153
497

143
488

153
501

158
519

139
488

149
501

154
519

133
500

142
513

147
531

138
493

148
506

153
524

138
494

147
507

152
525

140
496

150
509

155
527

145
522

155
535

160
554

142
517

152
530

157
549

136
532

145
546

150
565

140
522

150
535

155
554

139
525

149
538

154
557

141
526

151
539

156
558

148
558

158
572

164
592

145
547

155
561

160
581

137
567

147
582

152
602

Low side pressure ± 4 PSIG High side pressure ± 10 PSIG

Tables are based upon rated CFM (airow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge

should be removed, system evacuated and recharged to serial plate charge weight.

NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated check condenser fan wiring. See

“Condenser Fan Operation”.

HEATING PRESSURES – (ALL TEMPERATURES °F)

Model

S26H1 70 Deg.

S31H1 70 Deg.

S38H1 70 Deg.

S43H1 70 Deg.

S49H1 70 Deg.

S61H1 70 Deg.

Return Air

Temperature

Pressure 0 5 10 15 20 25 30 35 40 45 50 55 60 65

Low Side

High Side373044330550307573116331771325783358534693352

Low Side

High Side382814429150300573106432171332793438635494366

Low Side

High Side37270432764928255289622966930476313833229133399343

Low Side

High Side492735027553278572826228767294743038231291323

Low Side

High Side32310373114131553320643287333782348893619537799394

Low Side

High Side44283462924730249313523245733563347713608037391387

TABLE 5B

101
360

102
379

100
335

109

117
410

119
404

116
367

123
363

104
433

117
416

126
430

127
418

125
380

136
379

105
456

133
431

391

110
391

107
355

111
348

102
413

103
401

Manual 2100-527H
Page 23 of 29

134
452

136
432

134
393

150
396

104
481

149
447

Model

W26H1

W31H1

W38H1

W43H1

W49H1

W61H1

Return Air

Temperature

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

TABLE 6A

COOLING PRESSURE TABLE

Pressure 75 80 85 90 95 100 105 110 115 120

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

Low SIde

High Side

131
309

140
317

145
328

123

311

132
319

137
330

126
313

135
321

140
332

131
325

140
333

145
345

128
315

137
323

142
334

123
336

132
345

137
357

132
326

141
334

146
346

125
330

134
338

139
350

127
330

136
338

141
350

131
343

140
352

145
364

129
337

138
346

143
358

123
353

132
362

137
375

133
345

142
354

147
366

128
350

137
359

142
372

129
348

138
357

143
369

132
363

141
372

146
385

130
361

139
370

144
383

124
371

133
381

138
394

135
366

144
375

149
388

130
371

139
381

144
394

131
370

140
379

145
392

134
384

143
394

148
408

131
385

140
395

145
409

125
392

134
402

139
416

136
390

145
400

150
414

133
395

140
405

147
419

133
394

140
397

147
418

135
408

143
418

149
433

132
411

141
430

146
437

127
415

137
437

141
441

Air Temperature Entering Outdoor Coil °F

137
415

146
426

151
441

135
419

144
430

149
445

135
420

144
431

149
446

137
432

147
443

152
459

134
439

143
450

148
466

128
441

137
452

142
468

138
444

148
455

153
471

137
446

146
457

151
473

137
449

146
461

151
477

139
458

149
470

154
486

136
467

145
479

150
496

130
469

139
481

144
498

139
474

149
486

154
503

138
474

148
486

153
503

139
482

149
494

154
511

142
487

152
499

157
516

137
496

147
509

152
527

133
499

142
512

147
530

141
506

151
519

156
537

140
504

150
517

155
535

141
516

151
529

156
548

145
516

155
529

160
548

140
527

150
541

155
560

136
532

145
546

150
565

142
541

152
555

157
574

142
535

152
549

157
568

144
553

154
567

159
587

148
547

158
561

164
581

143
560

153
574

158
594

138
567

148
582

153
602

Low side pressure ± 4 PSIG High side pressure ± 10 PSIG

Tables are based upon rated CFM (airow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge

should be removed, system evacuated and recharged to serial plate charge weight.

NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated check condenser fan wiring. See

“Condenser Fan Operation”.

HEATING PRESSURES – (ALL TEMPERATURES °F)

Model

W26H1 70 Deg.

W31H1 70 Deg.

W38H1 70 Deg.

W43H1 70 Deg.

W49H1 70 Deg.

W61H1 70 Deg.

Manual 2100-527H
Page 24 of 29

Return Air

Temperature

Pressure 0 5 10 15 20 25 30 35 40 45 50 55 60 65

Low Side
High Side42279462855029256299623086831775327833389135099362

Low Side
High Side39274442834929355303613146832575336823489036198373

Low Side
High Side25251342604326952278602876829675306823159032596335

Low Side
High Side34265402704627553278602816728774294813048931797331

Low Side
High Side48283492935130354313583236333469345773568636896380

Low Side
High Side34270362783928643296493065531762328703418035490369

TABLE 6B

108
376

107
386

103
345

105
348

107
392

101
384

118
390

116
400

109
355

114
368

119
405

113
399

128
405

126
414

115
365

123
389

133
418

126
416

139
420

135
428

120
375

132
413

147
431

141
433

TABLE 7A

Electrical Specications — S**H Series

Single Circuit Multiple Circuit

Minimum Circuit

Ampacity





Ckt. ACkt. BCkt. CCkt. ACkt. BCkt. CCkt. ACkt. BCkt. CCkt. ACkt. BCkt.

10
10
10

12
10

14
12

10
10
10

10
10

14
12

10
10

8
8
8

10
10
10
10

14
10
10
10

10
10

8
8
8
8

10
10
10
10

12
10
10
10

10

8
8
8
8

10
10
10
10

12
10
10
10

10

8
8
8
8

10
10
10

12
10
10

42

32

52

32

52

35

34

26

34

42

34

52

35

52

39

26

39

42

39

52

39

52

43

26

43

52

43

52

43

52 26

Circuit



22
43
47

16
34

10
19

27
48
48

19
37

10
19

32
58
74
84
87

26
44
53
54

14
23
27
28

34
55
60
76
86
87

27
45
54
54

14
23
27
28

39
65
80
91
91

29
47
57
57

15
24
28
28

43
69
95
95

113

30
57
57

16
29
29

Maximum

External
Fuse or

Circuit

Breaker



30
50
50

20
40

15
20

35
50
50

25
40

15
20

45
60
80
90
90

35
50
60
60

15
25
30
30

50
60
70
80
90
90

35
50
60
60

20
25
30
30

50
70

90
100
100

40

50

60

60

20

25

30

30

60

80

100
100
125

40

60

60

20

30

30

Field

Power

Wire Size



10

8
8

12

8

14
12

8
8
8

10

8

14
12

8
6
4
4
3

8
8
6
6

14
10
10
10

8
6
6
4
3
3

8
8
6
6

12
10
10
10

8
6
4
3
3

8
8
6
6

12
10
10
10

8
4
3
3
2

8
6
6

12
10
10

Ground

WIre Size

No. of

Models

S26H1-A00, A0Z

-A04

-A08

S26H1-B00, B0Z

-B06

S26H1-C00, C0Z

-C06

S31H1-A00, A0Z

-A04

-A08

S31H1-B00, B0Z

-B06

S31H1-C00, C0Z

-C06

S38H1-A00, A0Z

-A05

-A08

-A10

-A15

S38H1-B00, B0Z

-B06

-B09

-B15

S38H1-C00, C0Z

-C06

-C09
C15

S43H1-A00, A0Z

-A04

-A05

-A08

-A10

-A15

S43H1-B00, B0Z

-B06

-B09

-B15

S43H1-C00, C0Z

-C06

-C09

-C15

S49H1-A00, A0Z

-A05

-A08

-A10

-A15

S49H1-B00, B0Z

-B09

-B15

-B18

S49H1-C00, C0Z

-C06

-C09

-C15

S61H1-A00, A0Z

-A05

-A10

-A15

-A20

S61H1-B00, B0Z

-B09

-B15

S61H1-C00, C0Z

-C09

-C15

 These “Minimum Circuit Ampacity” values are to be used for sizing the eld power conductors. Refer to the National Electrical Code (latest version),

Article 310 for power conductor sizing.

Caution: When more than one eld power circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of Table 310
regarding Ampacity Adjustment Factors when more than three (3) conductors are in a raceway.

 Maximum size of the time delay fuse or HACR type circuit breaker for protection of eld wiring conductors.
 Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
 Maximum KW that can operate with the heat pump on is 10KW.
 Maximum KW that can operate with the heat pump on is 5KW.
 Maximum KW that can operate with the heat pump on is 4KW.

IMPORTANT: While this electrical data is presented as a guide, it is important to electrically connect properly sized fuses & conductor wires in accordance with the
National Electrical Code & all local codes.

Rated Volts, HZ

and Phase

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

Circuits

Field

Power

1
1
1

1
1

1
1

1
1
1

1
1

1
1

1

1
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 3

1

1

1

1

1

1

Minimum

Ampacity

Maximum Circuit

Exterior Fuse or

Circuit Breaker



45

45

45

60

45

60

50

30

50

45

50

60

50

60

50

30

50

45

50

60

50

60

60

30

60

60

60

60

60

60 30

Field Power Wire

Size



8

8

8

6

8

6

8

10

8

8

8

6

8

6

8

10

8

8

8

6

8

6

8

10

8

6

8

6

6

6 10

Ground WIre Size

10
10
10

10
10
10
10

10
10
10
10

10
10
10
10

Manual 2100-527H
Page 25 of 29



10
10
10

10
10
10
10

10
10
10
10

10
10
10
10 10

C

TABLE 7B

Electrical Specications — W**H Series

Single Circuit Multiple Circuit

Minimum Circuit

Ampacity





Ckt. ACkt. BCkt. CCkt. ACkt. BCkt. CCkt. ACkt. BCkt. CCkt. ACkt. BCkt.

10
10
10

10
10

14
12

10
10
10

10
10

14
12

10
10

8
8
8

10
10
10
10

14
10
10
10

10
10

8
8
8
8

10
10
10
10

12
10
10
10

10
10

8
8
8
8

10
10
10
10

12
10
10
10

10

8
8
8
8

10
10
10

12
10
10

42

32

52

32

52

35

34

26

34

42

34

52

35

52

37

26

37

42

37

52

37

52

43

26

43

52

43

52

43

52 26

Circuit



25
46
47

18
36

11
10

26
47
47

19
37

9

18

32
58
74
84
87

26
44
53
54

14
23
27
28

34
55
60
76
86
87

27
45
54
54

14
23
27
28

37
58
63
78
89
89

28
46
55
55

14
23
28
28

43
69
95
95

113

30
57
57

16
29
29

Maximum

External

Fuse or

Circuit

Breaker



30
50
50

25
40

15
20

35
50
50

25
40

15
20

45
60
80
90
90

35
50
60
60

15
25
30
30

50
60
70
80
90
90

35
50
60
60

20
25
30
30

50
60
70
90
90
90

40
50
60
60

20
25
30
30

60

80
100
100
125

40

60

60

20

30

30

Field

Power

Wire Size



10

8
8

10

8

14
12

8
8
8

10

8

14
12

8
6
4
4
3

8
8
6
6

14
10
10
10

8
6
6
4
3
3

8
8
6
6

12
10
10
10

8
6
6
4
3
3

8
8
6
6

12
10
10
10

8
4
3
3
2

8
6
6

12
10
10

Ground

WIre Size

No. of

Models

W26H1-A00, A0Z

-A04

-A08

W26H1-B00, B0Z

-B06

W26H1-C00, C0Z

-C06

W31H1-A00, A0Z

-A04

-A08

W31H1-B00, B0Z

-B06

W31H1-C00, C0Z

-C06

W38H1-A00, A0Z

-A05

-A08

-A10

-A15

W38H1-B00, B0Z

-B06

-B09
B15

W38H1-C00, C0Z

-C06

-C09

C15

W43H1-A00, A0Z

-A04

-A05

-A08

-A10
A15

W43H1-B00, B0Z

-B06

-B09
B15

W43H1-C00, C0Z

-C06

-C09

-C15

W49H1-A00, A0Z

-A04

-A05

-A08

-A10

-A15

W49H1-B00, B0Z

-B06

-B09

-B15

W49H1-C00, C0Z

-C06

-C09

-C15

W61H1-A00, A0Z

-A05

-A10

-A15

-A20

W61H1-B00, B0Z

-B09

-B15

W61H1-C00, C0Z

-C09

-C15

 These “Minimum Circuit Ampacity” values are to be used for sizing the eld power conductors. Refer to the National Electrical Code (latest version), Article

310 for power conductor sizing.

Caution: When more than one eld power circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of Table 310
regarding Ampacity Adjustment Factors when more than three (3) conductors are in a raceway.

 Maximum size of the time delay fuse or HACR type circuit breaker for protection of eld wiring conductors.
 Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
 Maximum KW that can operate with the heat pump on is 10KW.
 Maximum KW that can operate with the heat pump on is 5KW.
 Maximum KW that can operate with the heat pump on is 4KW.

IMPORTANT: While this electrical data is presented as a guide, it is important to electrically connect properly sized fuses & conductor wires in accordance with the
National Electrical Code & all local codes.

Rated Volts, HZ

and Phase

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

230/208-60-1

230/208-60-3

460-60-3

Field

Power

Circuits

1
1
1

1
1

1
1

1
1
1

1
1

1
1

1

1
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2
1 or 3

1

1

1

1

1

1

Minimum

Ampacity

Manual 2100-527H
Page 26 of 29

Maximum Circuit

Exterior Fuse or

Circuit Breaker



45

45

45

60

45

60

50

30

50

45

50

60

50

60

50

30

50

45

50

60

50

60

60

30

60

60

60

60

60

60 30

Field Power Wire

Size



8

8

8

6

8

6

8

10

8

8

8

6

8

6

8

10

8

8

8

6

8

6

8

10

8

6

8

6

6

6 10

Ground WIre Size



10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10 10

C

TABLES 8

INDOOR BLOWER PERFORMANCE CFM

AT 230 OR 460 VOLTS

S26H1, S31H1

ESP in Inches
Water Column

High Speed

Dry/Wet Coil

W26H1, W31H1

Low Speed

Dry/Wet Coil

.0 1050/1000 950/900

.1 900/850 540/800

.2 750/700 700/650

 Above data is with 1" standard disposable or 1" washable lter
 For optional 2" pleated lter - reduce ESP by 0.08 in.
 Reconnect to next lower speed for free blow (non-ducted) installation.

TABLE 9A

S**H INDOOR BLOWER PERFORMANCE - CFM (0.00" — 0.50" H20) 

Model

Rated

ESP



Max
ESP



Blower

Only



Cooling



Electric

Heat

S38H .15 .50 1100 1100 1100

S43H .15 .50 1250 1250 1250

S49H .20 .50 1400 1400 1400

S61H .20 .50 1450 1450 1450

NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjusts itself to maintain approximately
the same rate of indoor airow in both heating & cooling, dry & wet coil conditions and at both 230/208 or 460 volts.

 Maximum ESP (inches WC) shown is with 2" thick disposable lter.

 Blower only CFM is the total air being circulated during continuous fan mode.

 CFM output on Cooling or Electric Heat.

TABLE 9B

W**H INDOOR BLOWER PERFORMANCE - CFM (0.00" — 0.50" H20) 



Max
ESP

Model

Rated

ESP

W38H .15 .50 800 1100 1100

W43H .15 .50 825 1250 1250

W49H .20 .50 825 1400 1400

W61H .20 .50 850 1450 1450



Blower

Only



Cooling



Electric

Heat

NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjusts itself to maintain approximately
the same rate of indoor airow in both heating & cooling, dry & wet coil conditions and at both 230/208 or 460 volts.

 Maximum ESP (inches WC) shown is with 2" thick disposable lter.

 Blower only CFM is the total air being circulated during continuous fan mode.

 CFM output on Cooling or Electric Heat.

Manual 2100-527H
Page 27 of 29

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 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

• 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 •

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

• Check power at motor

• Make sure blower wheel is tight on shaft

Current leakage from controls into G, Y or W?

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)

- Reduce restriction

- Reduce max. airow

Evidence of Moisture

• Motor failure or • Replace motor and
malfunction has occurred
and moisture is present

• Evidence of moisture

present inside air mover

“pufng”?

• Perform Moisture Check

Perform Moisture Check

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

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

½"

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?

Manual 2100-527H
Page 28 of 29

TROUBLESHOOTING GE ECM

™

MOTORS CONT’D.

Replacing ECM Control Module

To replace the control module for the GE variable-speed indoor blower motor
you need to take the following steps:

1. You MUST have the correct replacement module. The controls are

factory programmed for specic operating modes. Even though they look

alike, different modules may have completely different functionality.

USING THE WRONG CONTROL MODULE VOIDS ALL PRODUCT
WARRANTIES AND MAY PRODUCE UNEXPECTED RESULTS.

2. Begin by removing AC power from the furnace or air handler being
serviced. DO NOT WORK ON THE MOTOR WITH AC POWER
APPLIED. To avoid electric shock from the motor’s capacitors, disconnect

power and wait at least 5 minutes before opening motor.

3. It is usually not necessary to remove the motor from the blower
assembly. However, it is recommended that the whole blower assembly,
with the motor, be removed from the furnace/air handler. (Follow the
manufacturer’s procedures). Unplug the two cable connectors to the motor.
There are latches on each connector. DO NOT PULL ON THE WIRES.
The plugs remove easily when properly released.

4. Locate the two standard
housing (at the back end of the control opposite the shaft end). Refer to
Figure 14. Remove these two bolts from the motor and control assembly
while holding the motor in a way that will prevent the motor or control
from falling when the bolts are removed. If an ECM2.0 control is being
replaced (recognized by an aluminum casting rather that a deep-drawn
black steel can housing the electronics), remove only the hex-head bolts.

DO NOT REMOVE THE TORX-HEAD SCREWS.

5. The control module is now free of mechanical attachment to the
motor endshield but is still connected by a plug and three wires inside
the control. Carefully rotate the control to gain access to the plug at

the control end of the wires. With thumb and forenger, reach the latch

holding the plug to the control and release it by squeezing the latch tab
and the opposite side of the connector plug and gently pulling the plug
out of the connector socket in the control. DO NOT PULL ON THE

WIRES. GRIP THE PLUG ONLY.

6. The control module is now completely detached from the motor.
Verify with a standard ohmmeter that the resistance from each motor
lead (in the motor plug just removed) to the motor shell is >100K ohms.
Refer to Figure 15. (Measure to unpainted motor end plate.) If any motor
lead fails this test, do not proceed to install the control module. THE
MOTOR IS DEFECTIVE AND MUST BE REPLACED. Installing
the new control module will cause it to fail also.

7. Verify that the replacement control is correct for your application.
Refer to the manufacturer's authorized replacement list. USING THE

WRONG CONTROL WILL RESULT IN IMPROPER OR NO
BLOWER OPERATION. Orient the control module so that the 3-wire

motor plug can be inserted into the socket in the control. Carefully insert
the plug and press it into the socket until it latches. A SLIGHT CLICK
WILL BE HEARD WHEN PROPERLY INSERTED.
the replacement control per one of the three following paragraphs, 8a, 8b or 8c.

8a. IF REPLACING AN ECM 2.0 CONTROL (control in cast
aluminum can with air vents on the back of the can) WITH AN ECM

2.3 CONTROL (control containing black potting for water protection in
black deep-drawn steel case with no vents in the bottom of the can), locate
the two through-bolts and plastic tab that are packed with the replacement
control. Insert the plastic tab into the slot at the perimeter of the open end
of the can so that the pin is located on the inside of the perimeter of the
can. Rotate the can so that the tab inserts into the tab locater hole in the
endshield of the motor. Using the two through-bolts provided with the
replacement control, reattach the can to the motor.

THE TWO THROUGH-BOLTS PROVIDED WITH THE
REPLACEMENT ECM 2.3 CONTROL ARE SHORTER THAN
THE BOLTS ORIGINALLY REMOVED FROM THE ECM 2.0
CONTROL AND MUST BE USED IF SECURE ATTACHMENT OF
THE CONTROL TO THE MOTOR IS TO BE ACHIEVED.

DO NOT OVERTIGHTEN THE BOLTS.

¼" hex head bolts at the rear of the control

Finish installing

8b. IF REPLACING AN ECM 2.3 CONTROL WITH AN ECM 2.3
CONTROL, the plastic tab and shorter through-bolts are not needed. The
control can be oriented in two positions 180° apart. MAKE SURE THE

ORIENTATION YOU SELECT FOR REPLACING THE CONTROL
ASSURES THE CONTROL'S CABLE CONNECTORS WILL
BE LOCATED DOWNWARD IN THE APPLICATION SO THAT
WATER CANNOT RUN DOWN THE CABLES AND INTO THE
CONTROL. Simply orient the new control to the motor's endshield, insert

bolts, and tighten. DO NOT OVERTIGHTEN THE BOLTS.

8c. IF REPLACING AN ECM 2.0 CONTROL WITH AN ECM 2.0

CONTROL (It is recommended that ECM 2.3 controls be used for all
replacements), the new control must be attached to the motor using through

bolts identical to those removed with the original control. DO NOT
OVERTIGHTEN THE BOLTS.

9. Reinstall the blower/motor assembly into the HVAC equipment.
Follow the manufacturer's suggested procedures.

10. Plug the 16-pin control plug into the motor. The plug is keyed.
Make sure the connector is properly seated and latched.

11. Plug the 5-pin power connector into the motor. Even though the
plug is keyed, OBSERVE THE PROPER ORIENTATION. DO NOT
FORCE THE CONNECTOR. It plugs in very easily when properly
oriented. REVERSING THIS PLUG WILL CAUSE IMMEDIATE

FAILURE OF THE CONTROL MODULE.

Final installation check. Make sure the motor is installed as follows:

12.
a. Unit is as far INTO the blower housing as possible.
b. Belly bands are not on the control module or covering vent holes.
c. Motor connectors should be oriented between the 4 o’clock and 8

o’clock positions when the blower is positioned in its nal

location and orientation.
d. Add a drip loop to the cables so that water cannot enter the motor
by draining down the cables. Refer to Figure 16.

The installation is now complete. Reapply the AC power to the HVAC
equipment and verify that the new motor control module is working
properly. Follow the manufacturer's procedures for disposition of the old
control module.

Figure 14

Figure 15

Figure 16

Manual 2100-527H
Page 29 of 29