Bard Q24H1D, Q36H1D, Q30H1D, Q42H1D, Q48H1D Installation Instructions Manual

INSTALLATION
INSTRUCTIONS

QTEC SERIES
PACKAGED HEAT PUMP

Models:

Q24H1D Q30H1D
Q36H1D Q42H1D
Q48H1D Q60H1D

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

Since 1914 . . . Moving ahead, just as planned.

Manual: 2100-521B
Supersedes: 2100-521A
File: Vol II Tab 14
Date: 02-06-12

Manual 2100-521B
Page 1 of 48

CONTENTS

Getting Other Information and Publications

For more information, contact these publishers:......3

EC General Information

QT

QT

EC Model Nomenclature......................................4

Shipping Damage ....................................................8

Unit Removal From Skid ..........................................8

Handling Unit After Removal From Skid ..................9

General .................................................................... 9

Minimum Installation Height.....................................9

Duct Work.............................................................. 11

Filters ..................................................................... 11

Fresh Air Intake......................................................12

Service Light ..........................................................12

Condensate Drain..................................................12

Optional Rear Drain Kits ........................................12

Installation Instructions

Mounting the Unit...................................................19

Wiring — Main Power ............................................20

Wiring — Low Voltage Wiring ................................20

Low Voltage Connections ......................................21

General .................................................................. 21

Figures

Figure 1 Unit Dimensions.......................................7

Figure 2 Air Seal Under Unit ..................................8

Figure 3 Removal of Unit From Skid ......................8

Figure 4 Unit on Appliance Cart .............................9

Figure 5 Installation With Free Blow Plenum.......10

Figure 6 Ducted Application .................................10

Figure 7 Supply Duct Connections ...................... 11

Figure 8 Filter Location ........................................ 11

Figure 9 Optional Side Drain................................13

Figure 10 Standard Rear Drain .............................. 13

Figure 11 Rear Drain (Top View)............................13

Figure 12A
Figure 12B
Figure 12C
Figure 12D

Optional Rear Drain Kit ..........................14

Optional Rear Drain Kit ..........................15

Optional Rear Drain Kit ..........................16

Optional Rear Drain Kit ..........................17

Figure 13A Unit Mounting - Method 1 .........................18

Figure 13B Unit Mounting - Method 2 .........................18

Figure 14 Removing Locking Screws from Wheels19

Figure 15 Component Location..............................20

Figure 16 Thermostat Plug Terminals .................... 22

Figure 17 Dehum. Wiring w/"X" T-Stat ...................23

Figure 18 Dehum. Wiring w/"X" T-Stat & Demand....24

Figure 19 Dehum. Wiring w/"X" T-Stat & Vent Opt....25

Figure 20 Dehum. Wiring w/"E" T-St at ...................26

Figure 21 Dehum. Wiring w/"G" T-Stat...................27

Figure 22 Dehum. Wiring w/"

I" T-Stat ....................28

Figure 23 Fresh Air Damper Removal....................33

Figure 24 QERV Removal......................................34

Figure 25 CO

Figure 26 Dehumidification Mode Circuit ...............37

Controller........................................36

2

Figure 27 Cooling Mode Circuit..............................38

Figure 28 Defrost Control Board ............................40

Figure 29 Control Disassembly .............................. 44

Figure 30 Winding Test ..........................................44

Figure 31 Drip Loop ...............................................44

Figure 32 Fan Blade Setting ..................................45

Manual 2100-521B
Page 2 of 48

Start Up
R-410A Refrigerant:

General .................................................................. 29

Topping Off System Charge...................................29

Safety Practices..................................................... 29

Description of Standard Equipment........................... 30

Optional CFM ............................................................30

Important Installer Note.............................................30

Phase Monitor ...........................................................30

Three Phase Scroll Compressor Start Up

Information ................................................................30

Service Hints .............................................................31

Mist Eliminator Service..............................................31

Vent Options.............................................................. 32

Sequence of Operation .............................................35

Optional Climate Controls Sequence

of Operation ..................................................... 35 & 36

Refrigerant Tube Schematic for Reheat Coil.............36

Pressure Service Ports .............................................36

Defrost Cycle.............................................................39

Troubleshooting

Solid State Heat Pump Control Troubleshooting

Procedure..................................................................41

Checking Temperature Sensor..................................42

Troubleshooting GE ECM™ Blower Motors........ 43-44

Fan Blade Setting Dimensions..................................45

Refrigerant Charge....................................................45

Pressure Charts ...................................................46-47

Tables

Table 1 Factory Built-In Electric Heat Table ........... 4

Table 2 Electrical Specifications ............................5

Table 2A Electrical Specifications ............................6

Table 3 Operating Voltage Range........................20

Table 4 Wall Thermostats ....................................22

Table 5 Troubleshooting ......................................41

Table 6 Temperature vs Resistance of

Temperature Sensor................................ 42

Table 7 Fan Blade Dimensions............................45

Table 8 Superheat at Compressor .......................45

Table 9 Indoor Blower Performance .................... 45

Table 10 Cooling Pressure ....................................46

Table 11 Heating Pressure ....................................47

Table 12 Dehumidification Relay Logic Board .......48

GETTING OTHER INFORMATION AND PUBLICATIONS

These publications can help you install the air
conditioner or heat pump. You can usually find these at
your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.

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

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

of Air Conditioning and Ventilating Systems

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

Heating and Air Conditioning Systems

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

Winter and Summer Manual N
Air Conditioning

Low Pressure, Low Velocity ........ ACCA Manual D or

Duct System Design Manual Q
Winter and Summer
Air Conditioning

FOR MORE INFORMATION, CONTACT THESE
PUBLISHERS:

ACCA Air Conditioning Contractors of America

1712 New Hampshire Avenue
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 2100-521B
Page 3 of 48

QT

EC

Series General Information

QTEC MODEL NOMENCLATURE

Q 36 H 1 D A 10 X X X X X X

MODEL
NUMBER

Q - QT

EC

CAPACITY |

24 - 2 Ton
30 - 2½ Ton
36 - 3 Ton
42 - 3½ Ton
48 - 4 Ton
60 - 5 Ton

HEAT
PUMP

REVISION |

SPECIAL UNITS |

D - Dehumidification

w/Hot Gas Reheat

VOLTS & PHASE |

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

FILTER OPTIONS

KW

0Z - 0KW
05 - 5KW
06 - 6KW
09 - 9KW
10 - 10KW
12 - 12KW
15 - 15KW

VENTILATION OPTIONS

X - Barometric Fresh Air Damper (Standard)
B - Blank-off Plate
R - Energy Recovery Ventilator w/Exhaust
P - Commercial Ventilator - Motorized w/Exhaust

Power Return

V - Commercial Ventilator - Motorized w/Exhaust

Spring Return

X - 1-Inch Fiberglass

(Standard)
F - 2-Inch Fiberglass
P - 2-Inch Pleated

COLOR OPTIONS

X - Standard Beige
V - Platinum w/Slate

Front (Vinyl)

4 - Gray paint

CLIMATE CONTROL OPTIONS

X - None
E - Electronic/Prog/Man/Auto/Humidistat
G - Electronic/Non Prog/Man/Auto/Humidistat

I

- Electronic/Prog/Man/Auto/with CO

COIL OPTIONS

X - Standard

INTERNAL CONTROLS

X - Standard

• High Pressure Switch

• Low Pressure Switch

• Compressor Time Delay

E - Low Ambient Control
Q - Outdoor Thermostat
R - Low Ambient Control &

Outdoor Thermostat

2

TABLE 1

FACTORY BUILT-IN ELECTRIC HEAT TABLE

AD1H63Q

sledoM

AD1H42Q
AD1H03QBD1H42QBD1H03QCD1H42QCD1H03Q

AD1H24Q
AD1H84Q
AD1H06Q

1-V0421-V8021-V0421-V8021-V0421-V8023-V0843-V0841-V0421-V8021-V0421-V8023-V084

WKHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTB

0.5083,61092,21

0.6005,02063,51005,02063,51005,02005,02005,02063,51005,02

0.9007,03000,32007,03000,32007,03007,03007,03000,32007,03

0.01076,23075,42 076,23075,42

0.21000,14007,03000,14

0.51 051,94068,63051,94068,63051,94

BD1H63Q
BD1H24Q
BD1H84Q
BD1H06Q

CD1H63Q
CD1H24Q
CD1H84Q
CD1H06Q

Manual 2100-521B
Page 4 of 48

TABLE 2

ELECTRICAL SPECIFICATIONS

4 51A

5 51B

5 51C

tiucriCelgniS tiucriClauD

ledoM

Z0AD1H42Q
50A
01A

Z0BD1H42Q
60B
90B

Z0CD1H42Q
60C
90C

Z0AD1H03Q
50A
01A

Z0BD1H03Q
60B
90B
21B

Z0CD1H03Q
60C
90C
21C

Z0AD1H63Q
50A
01A

Z0BD1H63Q
60B
90B

Z0CD1H63Q
60C
90C

detaR

stloV

esahPdna

1-802/032

3-802/032

3-064

1-802/032

3-802/032

3-064

1-802/032

3-802/032

3-064

3 muminiM

dleiF.oN
rewoP
stiucriC

1
1

2ro1
1
1
1
1
1
1
1
1

2ro1
1
1
1
1
1
1
1
1
1
1

2ro1

2ro1
1
1
1
1
1
1
1
1

1 mumixaM

tiucriC

yticapmA

22
74
27
71
53
44
01
91
32
52
05
57
81
73
54
55
21
12
52
03
13
65
18
38
52
34
25
35
21
12
62
72

2 dleiF
esuFlanretxE
.rkrB.tkCro

03
05
08
02
53
54
51
02
52
53
05
08
52
04
54
06
51
52
52
03
54
06
09
09
03
05
06
06
51
52
03
03

2 dnuorG

rewoP

eziSeriW

01
8
4

21
8
8

41

21

01
8
8
4

01
8
8
6

41

01

01

01
8
6
4
4

01
8
6
6

41

01

01

01

3 muminiM

eriW

01
01

8

21
01
01
41
21
01
01
01

8

01
01
01
01
41
01
01
01
01

01
8
8

01

01

01

01

41

01

01

01

A.tkC B.tkC A.tkC B.tkC A.tkC B.tkC A.tkC B.tkC

-

­22

-

-

-

-

-

-

-

­52

-

-

-

-

-

-

-

-

-

-

13

33

-

-

-

-

-

-

-

-

1 mumixaM

tiucriC

yticapmA

-

-

­05

-

-

-

-

-

-

-

­05

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-

-

-

-

-

-

­05
05

-

-

-

-

-

-

-

-

-

-

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03

-

-

-

-

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-

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-

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-

03

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54

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2 dleiF

esuFlanretxE

rekaerB.tkCro

05

05

05
05

rewoP

-

­01

-

-

-

-

-

-

-

­01

-

-

-

-

-

-

-

-

-

-

8
8

-

-

-

-

-

-

-

-

2 dnuorG

eziSeriW

-

-

-

-

8

01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

8

01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

8

01

8

01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

1 Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
2 Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
3 These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electric

Code (latest revision), article 310 for power conductor sizing.

CAUTION: When more than one field power conductor circuit is run through one conduit, the conductors must be derated. Pay

special attention to Note 8 of Table 310 regarding Ampacity Adjustment Factors when more than three conductors
are in a raceway.

4 Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
5 Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.

eziSeriW

-

­01

-

-

-

-

-

-

-

­01

-

-

-

-

-

-

-

-

-

­01
01

-

-

-

-

-

-

-

-

NOTE: Reference Form 7960-582 for dehumidification model performance information.

ELECTRICAL SPECIFICATIONS Continued on Page 6 TABLE 2A

Manual 2100-521B
Page 5 of 48

TABLE 2A

ELECTRICAL SPECIFICATIONS

(continued from Page 5)

tiucriCelgniS tiucriClauD

ledoM

Z0AD1H24Q
50A
01A

4 51A

Z0BD1H24Q
60B
90B

5 51B

Z0CD1H24Q
60C
90C

5 51C

Z0AD1H84Q
50A
01A

4 51A

Z0BD1H84Q
60B
90B

5 51B

Z0CD1H84Q
60C
90C

5 51C

Z0AD1H06Q 1 54 06 8 01 - - - - - - - ­50A
01A

5 51A

Z0BD1H06Q 1 13 54 8 01 - - - - - - - ­90B

5 51B

Z0CD1H06Q 1 71 52 01 01 - - - - - - - ­90C

5 51C

detaR

stloV

esahPdna

1-802/032

3-802/032

3-064

1-802/032

3-802/032

3-064

1-802/032

3-802/032 1

3-064 1

3 muminiM

dleiF.oN
rewoP
stiucriC

1
1

2ro1

2ro1
1
1
1
1
1
1
1
1
1

2ro1

2ro1

2ro1
1
1
1
1
1
1
1
1

2ro1

2ro1

2ro1

1

1

1 mumixaM

tiucriC

yticapmA

43
95
48
48
52
34
25
35
31
22
62
72
83
36
88
88
92
74
65
65
51
42
82
82

07
59
59

85
85

13
13

2 dleiF
esuFlanretxE
.rkrB.tkCro

05
06
09
09
53
05
06
06
51
52
03
03
05
07
09

09
04
05
06
06
02
52
03
03

09

001
001

06
06

53
53

2 dnuorG

rewoP

eziSeriW

8
6
4
4
8
8
6
6

41
01
01

01
8
6
3
3
8
8
6
6

21

01

01

01

4
3
3

6
6

8
8

3 muminiM

eriW

01

01
8
8

01

01

01

01

41

01

01

01

01
8
8
8

01

01

01

01

21

01

01

01

8
8
8

01

01

01

01

A.tkC B.tkC A.tkC B.tkC A.tkC B.tkC A.tkC B.tkC

-

­43
43

-

-

-

-

-

-

-

-

­83
83
83

-

-

-

-

-

-

-

-

54
54
54

-

-

-

-

1 mumixaM

tiucriC

yticapmA

-

-

­05
05

-

-

-

-

-

-

-

-

­52
05
05

-

-

-

-

-

-

-

-

52
05
05

-

-

-

-

-

-

­54
54

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

­05
05
05

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

06
06
06

-

-

-

-

-

-

-

-

2 dleiF

esuFlanretxE

rekaerB.tkCro

05
05

52
05
05

52
05
05

rewoP

-

­8
8

-

-

-

-

-

-

-

-

­8
8
8

-

-

-

-

-

-

-

-

8
8
8

-

-

-

-

2 dnuorG

eziSeriW

-

-

-

-

8

01

8

01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

01

01

8

01

8

01

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

01

01

8

01

8

01

-

-

-

-

-

-

-

-

1 Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
2 Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
3 These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electric

Code (latest revision), article 310 for power conductor sizing.

CAUTION: When more than one field power conductor circuit is run through one conduit, the conductors must be derated. Pay

special attention to Note 8 of Table 310 regarding Ampacity Adjustment Factors when more than three conductors
are in a raceway.

4 Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
5 Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.

eziSeriW

-

­01
01

-

-

-

-

-

-

-

-

­01
01
01

-

-

-

-

-

-

-

-

01
01
01

-

-

-

-

NOTE: Reference Form 7960-582 for dehumidification model performance information.

Manual 2100-521B
Page 6 of 48

FIGURE 1

Q24H1D

UNIT DIMENSIONS

Q30H1D

Q36H1D

Q42H1D

Q48H1D

Q60H1D

Manual 2100-521B
Page 7 of 48

SHIPPING DAMAGE

Upon receipt of equipment, the carton should be
checked for external signs of shipping damage. The
skid must remain attached to the unit until the unit is
ready for installation. If damage is found, the receiving
party must contact the last carrier immediately,
preferably in writing, requesting inspection by the
carrier’s agent.

UNIT REMOVAL FROM SKID

WARNING

This unit is heavy and requires more than one
person to handle and remove from the skid.
Check unit wheels to ensure that wheels are
locked before removing from skid. Extreme
caution must be taken to prevent injury to
personnel and damage to the unit.

FIGURE 2

AIR SEAL UNDER QT

Air Seal

EC

UNIT

It is recommended that the unit not be removed from
the skid with a forklift since the air seal under the unit
could be damaged. See Figure 2.

The shipping brackets on each side of the unit must be
removed and discarded. See Figure 3-A. The return air
grille panel can be removed to provide a place to hold
the unit. The unit can be slid forward on the skid until

REMOVAL OF UNIT FROM SKID

the front wheels hang over the edge of the skid. See
Figure 3-B. The unit can be tipped forward and slid
down the edge of the skid until the front wheels touch
the ground. See Figure 3-C. The wheels will not roll.
They are shipped from the factory locked so they will
not roll. The back of the skid will have to be held down
to keep it from tipping up. The skid can be slid out from
under the unit. The unit can then be set upright.

FIGURE 3

Hold

Skid

Down

A Shipping Brackets B Front Wheels Over Edge C Front Wheels On Floor

Manual 2100-521B
Page 8 of 48

HANDLING UNIT AFTER REMOVAL
FROM SKID

WARNING

Exercise extreme caution when pushing the
unit on the rollers. Handle and push from the
lower 1/3 of the unit. Insure that debris is not
on the floor where the unit is to be moved on
the rollers. Failure to do so could result in the
unit tipping over and causing bodily injury and/
or damage to the unit.

The unit will have to be turned sideways and removed
from the skid to fit through a 36" doorway. If the door
height allows, the unit can be slid sideways through the
door.

If the unit can not be slid through the door, then the unit
will have to be put on a cart and tipped down to roll
through the door. It is recommended that an appliance
cart be used with a strap to hold the unit on the cart.
The wheels of the unit must be locked. If the wheels
were allowed to roll, the unit could roll off the cart. The
unit should always be carted from the left side. This is
the side where the compressor is located. See Figure 4.

The blade of the appliance cart should be slid under the
wheels of the unit. The strap of the appliance cart
should be placed around the unit and strapped tightly.
Help will be required to tip the unit back onto the cart.
The unit can be leaned far enough back to be rolled
through the door. Be careful when setting the unit back
up to keep from damaging the unit.

GENERAL

The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.

A QWS-Series wall sleeve supplied as a separate
accessory must be ordered and installed with QTec unit.

The unit is designed for use with or without duct work.
For use without duct work, Plenum Box QPB42 is
recommended.

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 “Start
Procedure” and any tags and/or labels attached to the
equipment.

APPLIANCE
CART

COMPRESSOR

FIGURE 4

UNIT ON APPLIANCE CART

QTEC UNIT

(Right Side)

STRAP

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 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.

MINIMUM INSTALLATION HEIGHT

The minimum installation height of the unit with a Free
Blow Plenum is 8 ft. 6 in. This provides enough
clearance for the plenum to be removed. See Figure 5.

The minimum installation height for ducted applications
is 8 ft. 4½ in. This provides enough clearance to install
the duct work. See Figure 6.

Manual 2100-521B
Page 9 of 48

FIGURE 5

INSTALLATION WITH FREE BLOW PLENUM

FIGURE 6

DUCTED APPLICATION

Manual 2100-521B
Page 10 of 48

DUCT WORK

Any heat pump is more critical of proper operating
charge and an adequate duct system than a straight air
conditioning unit. All duct work 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. 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.

The QTEC series heat pump has provision to attach a
supply air duct to the top of the unit. Duct connection
size is 12 inches x 20 inches. The duct work is field
supplied and must be attached in a manner to allow for
ease of removal when it becomes necessary to slide the
unit out from the wall for service. See Figure 7 for
suggested attachment method.

FIGURE 7

SUPPLY DUCT CONNECTIONS

For hot water coil option a QPBHWxx-F for free blow
or QPBHWxx-D for ducted airflow is used.

When used with a ducted supply, a QCX Cabinet
Extension can be used to conceal the duct work above
the unit to the ceiling. This extends 20" above the unit
for a total height above the floor of 10'-7/8". The unit is
equipped with a variable speed indoor blower motor
which increases in speed with an increase in duct static
pressure. The unit will therefore deliver proper rated
airflow up to the maximum ESP shown in Table 9.
However, for quiet operation of the air system, the duct
static should be kept as low as practical, within the
guidelines of good duct design.

FILTERS

Two 1-inch throw away filters [(1) 16x16 and (1)
16x20] are supplied with each unit. The filters slide into
filter brackets. Refer to Figure 8.

The filters are serviced from the inside of the building
by opening the hinged door. This door is attached by
1/4 turn fasteners and one locking latch.

The internal filter brackets are adjustable to
accommodate 2-inch filters. The tabs for the 1-inch
filters must be bent down to allow the 2-inch filters to
slide in place.

SUPPLY DUCT

TO BE FIELD

SUPPLIED

ATTACHMENT

SCREWS TO

BE FIELD

SUPPLIED

ROOM SIDE OF

EC UNIT

QT

DUCT FLANGE
PROVIDED WITH
UNIT

NOTE: Unit cabinet, supply air duct and free blow

plenum are approved for “0” clearance to
combustible material.

The QTEC series heat pumps are designed for use with
free return (non-ducted) and either free blow with the
use of QPB Plenum Box or a duct supply air system.

FIGURE 8

FILTER LOCATION

FILTERS

RETURN AIR
GRILLE

The QPB and QPBHW Plenum Box mounts on top of
the unit and has both vertically and horizontally
adjustable louvers on the front discharge grille.

Manual 2100-521B
Page 11 of 48

FRESH AIR INTAKE

CONDENSATE DRAIN

This unit is equipped with a fresh air damper assembly.
The damper blade is locked in the closed position when
the unit is shipped from the factory. To allow the
damper to operate, remove the two plastic locking pins,
one on each end of the blade. This will allow for
maximum fresh airflow. The damper blade will now
open when the indoor blower is operating. If less than
maximum fresh airflow is required, reinsert the plastic
pins to limit damper blade opening to desired level.
Two extra pins are provided (taped to the inside of the
assembly) which may be used to hold the blade in some
position other than minimum or maximum position.
This fresh air assembly is located in the rear of the unit
and to gain access to make these adjustments remove
the air filter service door.

All capacity, efficiency and cost of operation
information as required for Department of Energy
“Energyguide” Fact Sheets are based upon the fresh air
blank-off plate in place and is recommended for
maximum energy efficiency.

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

For details on energy recovery ventilation see Page 31
for details.

SERVICE LIGHT

The unit is equipped with a service light which signals
the user that service is required. The light is located in
the upper control panel and is visible only when the
hinged service/filter access door is open.

The Service Unit light indicates that the unit has been
shut off by a high or low pressure device. This indicates
that the unit needs to be serviced. See Page 29 for
details.

There are two drain connections on the unit. The rear
drain is the primary drain, and is located on the right
lower rear panel of the unit. The optional side drain is
located on the bottom right side of the unit. The side
drain is shipped with a plug installed.

The side drain requires a water trap for proper drainage.
See Figure 9. The drain can be routed through the floor
or through the wall. If the drain is to be routed through

an unconditioned space, it must be protected from
freezing. The drain line must be able to be removed

from the unit if it is necessary to remove the unit from the
wall. When the side drain is used, the plug must be
removed and installed in the rear drain outlet.

The rear drain can be used with wall thickness of up to
10 inches where a water trap can be installed between
the unit and the interior wall. See Figure 10. The trap
cannot extend beyond the edge of the unit or it will
interfere with the wall mounting bracket. The drain can
be routed through the floor or through the wall. If the
drain is routed through the wall, the drain line must be
positioned such that it will not interfere with the sleeve
flange or the grille. See Figure 11. If the drain is to be

routed through an unconditioned space, it must be
protected from freezing.

OPTIONAL REAR DRAIN KITS

Optional Rear Drain Kit, Bard Model QCDS48A, is
also available for these products. The optional rear
drain kit offers multiple benefits that include the
following:

• Allows unit to be rolled away from the sleeve
without having to disconnect any hard plumbing
connections.

• Allows indoor coil condensate to be easily
connected to Rear Drain Box while bypassing the
outdoor coil drain pan. This aids in minimizing the
potential for biological growth to occur by
minimizing the standing water and exposing it to
warm temperatures.

See Figures 12A, 12B, 12C and 12D.

The drain box permanently mounts onto the wall sleeve
and is then either piped directly outdoors, or can be
piped vertically. The Q/Tec unit is then equipped with
fittings on the rear of the unit that slide into the drain
box as it is wheeled towards the wall sleeve.

NOTE: On models equipped with a refrigerant
subcooler in the lower drain pan may experience a 2­3% decrease in cooling performance and efficiency
when the indoor condensate is routed around the
outdoor coil drain pan/subcooler assembly. Unit rated
performance and efficiency are with the indoor
condensate routed to the outdoor coil pan.

There is also a heated version of the rear drain box
available (Model #QCDS48H) for installation in
northern climates where freezing may occur.

Manual 2100-521B
Page 12 of 48

FIGURE 9

OPTIONAL SIDE DRAIN (SIDE VIEW)

INSTALLATION

QTEC UNIT

FIGURE 10

STANDARD REAR DRAIN

SLEEVE

WATER
TRAP

FIGURE 11

REAR DRAIN (TOP VIEW)

DRAIN LINE

WALL (MAXIMUM

10" FOR REAR

DRAIN)

COUPLINGS NOT
SHOWN BUT
RECOMMENDED
FOR EASE OF
REMOVABILITY
FOR SERVICE.

WALL
BRACKET

UNIT

Manual 2100-521B
Page 13 of 48

WALL SLEEVE

MIS-2469

FIGURE 12A

OVERFLOW TUBE

CAULK AROUND TUBE

DRAIN BOX

Manual 2100-521B
Page 14 of 48

PLUG INSTALLED IN
SIDE Q/Tec DRAIN

FIGURE 12B

REAR DRAIN CONNECTION IN
Q/Tec PRODUCT

3/4" PLASTIC PIPE NIPPLE
SUPPLIED WITH DRAIN BOX KIT
(APPLY TEFLON TAPE TO
THREADS)

IMPORTANT !

1/2" SLIP X 1/2" SLIP X 3/4" NPT
TEE SUPPLIED WITH DRAIN BOX KIT
(TIGHTEN THREADS SO TEE IS
HORIZONTAL TO FLOOR)

MIS-2470

Manual 2100-521B
Page 15 of 48

FIGURE 12C

REMOVE KNOCK-OUT FOR
INDOOR DRAIN HOSE CONNECTOR

(If Used)

Manual 2100-521B
Page 16 of 48

MIS-2471

FIGURE 12D

DRAIN HOSE FROM INDOOR
DRAIN PAN.

MOVE HOSE FROM ATTACHMENT IN
LOWER DRAIN PAN AND SLIDE ONTO
DRAIN BOX BARB FITTING, SECURING
WITH SUPPLIED CLAMP IF OUTDOOR
PAN IS BYPASSED. ( WILL REDUCE RISK
OF ALGAE GROWTH IN THE OUTDOOR
PAN BUT AT A SLIGHT COOLING
PERFORMANCE REDUCTION OF 2-3% )

MIS-2472

Manual 2100-521B
Page 17 of 48

BOTTOM

TRIM PIECE

BOTTOM TRIM
EXTENSION

FIGURE 13A

UNIT MOUNTING - Method 1

SIDE TRIM

(2 PCS.)

SIDE TRIM

(2 PCS.)

#8 SCREW

PROVIDED
MOUNTING
BRACKET

(LIGHT COLOR)

CABINET
SIDE PANEL

ENLARGED VIEW OF MOUNTING
BRACKET SHOWING SLEEVE TO

CABINET ATTACHMENT

MOUNTING BRACKET

WALL
SLEEVE

#10 HEX

HEAD SCREW

PROVIDED

Sleeve

Washer

FIGURE 13B

UNIT MOUNTING - Method 2

Return Grille

Stud

Nut

Condenser

Door (Removed)

MIS-2689

Lower Control Panel

Manual 2100-521B
Page 18 of 48

INSTALLATION INSTRUCTIONS

MOUNTING THE UNIT

When installing a QTEC unit near an interior wall on the
left side, a minimum of 8 inches is required; 12 inches is
preferred.

When installing a QTEC unit near an interior wall on the
right side, a minimum of 18 inches is required as
additional space is required to connect the side drain. If
the rear condensate drain kit QCDS48 is used the
minimum can be reduced to 8 inches.

This clearance is required to allow for the attachment of
the unit to the sleeve and side trim pieces to the wall.

This unit is to be secured to the wall sleeve with
mounting brackets provided. The unit itself, the supply
duct and the free blow plenum are suitable of “0”
clearance to combustible material.

Following are the steps for mounting the QT
reference see Figure 13A for external mounting bracket
or 13B for internal bolt secured bracket (recommended).

1. Attach mounting brackets to the wall sleeve with
screws provided. Either use external mounting
bracket (Fig. 13A) or internal bolt bracket (Fig. 13B).

2. Position the unit in front of the sleeve with the
condenser section toward the sleeve.

3. Remove the locking screws from the wheels.
Refer to Figure 14.

4. Roll the unit into the sleeve. Make sure to check
both sides of the unit as it is being rolled to keep
it centered in the sleeve. Also check the

EC

. For

alignment to the mounting brackets. This unit
must be level from side to side. If adjustments
are necessary, shim up under the rollers with
sheets of steel or any substance that is not
affected by moisture.

5. Make sure the gasket on the rear of the unit is
touching the sleeve across the top and down both
sides. This is a rain water seal.

6. Secure the mounting brackets to the unit with
screws provided, #10 hex head sheet metal
screws (Figure 13A) or use nut and washer to
secure sleeve (Figure 13B).

7. Bottom trim extensions are provided for use when
wall is less than 14 inches but greater than 10.5
inches. Secure to wall with screws (not provided).

8. Attach the bottom trim piece to the unit with the
screws provided (dark colored).

9. Position side trim pieces to wall and attach with
field supplied screws. There are two long pieces
and two short pieces supplied. The long pieces
are to enclose the gap behind the unit. The short
pieces are to fill the gap behind the cabinet
extension or the free blow plenum box. They
may be cut to suit your ceiling height or overlap
the unit side trim. There is sufficient length to
trim up to a 10'2" ceiling.

NOTE: If the exterior wall thickness is between 5

inches to 10.5 inches, a side trim extension

piece kit, model QSTX42, is available.

REMOVING LOCKING SCREWS FROM WHEELS

REMOVE SCREWS FROM

WHEELS BEFORE ROLLING

INTO PLACE

FIGURE 14

Manual 2100-521B
Page 19 of 48

WIRING – MAIN POWER

Refer to the unit rating plate and/or Table 2/2A for wire
sizing information and maximum fuse or “HACR Type”
circuit breaker size. Each 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 (75°C
copper) for all models, including the most commonly
used heater sizes. Also shown are the number of field
power circuits required for the various models with
heaters.

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

FIGURE 15

COMPONENT LOCATION

ELECTRIC
HEATERS

THERMOSTAT
& HUMIDISTAT
CONTROLS

DEHUMIDIFICATION
CONTROL

SIDE FIELD WIRE

ENTRANCE

REMOTE

THERMOSTAT

TERMINAL

BLOCK

INDOOR
BLOWER

CIRCUIT BREAKER

PANEL &

CONTROLS

LOWER
CONTROL
PANEL

The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect.

See Start Up section for information on three phase
scroll compressor start-ups.

The field wiring connections are located behind the top
and hinged panel in the circuit breaker panel. See
Figure 15.

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 as noted in Table 3.

TABLE 3

OPERATING VOLTAGE RANGE

PATEGNAR

V042612–352
V802781–022

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).

The standard Climate Control Option X is a remote
thermostat connection terminal block. See Figure 17 for
wiring diagram. Compatible thermostats are listed in
Table 4.

The Climate Control Option E is an electronic,
programmable thermostat and a humidistat. The sub
base of the thermostat and the humidistat are factory
wired to the front panel of the unit. See Figure 19 for
wiring diagram. Compatible for use with Energy
Recovery Ventilator or Ventilator.

The Climate Control Option G is an electronic,
non-programmable thermostat and humidistat. The
subbase of the thermostat is factory wired to the front
panel of the unit. This option is compatible for use with
the optional CS2000A* Energy Control Monitor and a
terminal block is provided for connection to the
CS2000A*. See Figure 20 for wiring diagram.
Compatible for use with Energy Recovery Ventilator or
Ventilator.

The Climate Control Option I is an electronic,
programmable thermostat, humidistat and a CO
controller. The subbase of the thermostat and CO
controller are factory wired to the front panel of the unit.
See Figure 21 for wiring diagram.

2

2

Manual 2100-521B
Page 20 of 48

NOTE: On options X and G the CS2000A* (or other

field provided means to control ventilation) must
be used if any of the mechanical (motorized)
ventilation options are installed.

LOW VOLTAGE CONNECTIONS

These units use a grounded 24 volt AC low voltage
circuit.

The “R” terminal is the hot terminal and the “C”
terminal is grounded.

“G” terminal or pin 6 of P4 is the fan input.

“Y” terminal or pin 7 of P4 is the compressor input.

“B” terminal or pin 8 of P4 is the reversing valve input.

The reversing valve must be energized for heating
mode.

“R” terminal or pin 10 of P4 is 24 VAC hot.

“C” terminal or pin 11 of P4 is 24 VAC grounded.

“L” terminal or pin 12 of P4 is compressor lockout

output

pressure trip by the electronic heat pump control. This
is a 24 VAC output.

“W2” terminal or pin 9 of P4 is second stage heat (if
equipped). If the unit is equipped with an optional hot
water coil plenum box the water valve will be connected
to this terminal.

“O1” terminal of pin 5 of P4 is the ventilation input.
This terminal energizes any factory installed
ventilation option.

. This terminal is activated on a high or low

LOW VOLTAGE CONNECTIONS

FOR

DDC CONTROL

Fan Only Energize G

Cooling Mode Energize Y, G

Heat Pump
Heating Energize Y, G, B

2nd Stage Heating Energize G, W2, Y, B
(if employed)

Ventilation Energize G, O1

Dehumidification Connect 4 & 5

Emergency Heat Energize B, W2, E, G

GENERAL

This unit is equipped with a variable speed ECM motor.
The motor is designed to maintain rated airflow up to
the maximum static allowed. It is important that the

blower motor plugs are not plugged in or unplugged
while the power is on. Failure to remove power prior
to unplugging or plugging in the motor could result in
motor failure.

“E” terminal or pin 3 of P4 is the emergency heat input.
This terminal energizes the emergency heat relay.

NOTE: For total and proper control using DDC, a total

of 7 controlled outputs are required (6 if no
ventilation system is installed). For proper
system operation under Emergency Heat
conditions where the compressor needs to be
deactivated, the B-W2-E outputs need to be
energized. Removing the Y (compressor) signal
alone turns the compressor off, but does not
activate the additional circuitry embedded in
the heat pump for proper and complete
operation.

“5” terminal or pin 2 of P4 is the 24 dehumidification
circuit.

“4” terminal of pin 4 or P4 is the dehumidification
circuit. A contact must connect terminals 4 and 5.

“6” terminal of pin 1 of P4 is VAC grounded to the
humidistat, if needed.

CAUTION

Do not plug in or unplug blower motor
connectors while the power is on. Failure to do
so may result in motor failure.

Manual 2100-521B
Page 21 of 48

TABLE 4

WALL THERMOSTATS

tatsomrehTserutaeFtnanimoderP

650-3048

)8001A2327C(

850-3048

)1511D0225HT(

060-3048

)544-0211(

FIGURE 16

rofDCLhtiwrosneSedixoiDnobraC

sgnidaeRrosneS

taeHegats2;looCegats2

elbammargorP-noNcinortcelE

lanoitnevnoCroPH

revoegnahclaunaMrootuA

taeHegats3;looCegats3

cinortcelEelbammargorP-noN/elbammargorP

lanoitnevnoCroPH

revoegnahclaunaMrootuA

Manual 2100-521B
Page 22 of 48

MIS-1285

Plug #2

123

9

8

4

7

6

5

11

10

12

FIGURE 17

Thermostat

B

3

2

Red/WhiteRed/White

R

Black/White

C

Black/White

4102-063 A

Black

Red/Yellow

Brown/White

Purple/White

L

E1

L

E1

Relay Logic Board

G1

Orange

BK

RV

Freeze

Protect Tstat

Blue

Brown

Yellow

YO

TWV

W

A1

Bard Part #8408-038

Red/White

A2

W2

Return Air

Pink

Y

RAT

D

G

Dehumidification Wiring Diagram

With "X" Thermostat Option

H200

Humidistat

Red

Purple/White

Brown/White

Blue

Yellow

Purple/White

4

D/YO

Orange

7

6

5

Yellow

Orange

Brown/White

Y

G

O1

A

Y1

G

Y1

Y

G

Black/White

Red/White

1

234

Plug #4

Red/White

Red/Yellow

Black/White

5

6

E

W1/E

6

5

3

E

4

Brown

9

8

Blue

B

O/B

O/B

W1

101112

Brown

R

W2

W2

AUX

Red/White

Black/White

L

C

R

L

C

L

R

C

Rc

Term. Block

Low Voltage

8403-060

Thermostat

1

8403-058

TH5220D1151

Thermostat

FACTORY INSTALLED JUMPER

1

Manual 2100-521B
Page 23 of 48

Plug #2

1

234

6

11

10

12

9

8

7

5

FIGURE 18

Return Air

Thermostat

B

3

2

Red/White

R

Red/White

Black/White

C

Black/White

MIS-2690 A

Black

Red/Yellow

Brown/White

Purple/White

L

E1

L

E1

Relay Logic Board

G1

Yellow

Orange

BK

RV

Freeze

Protect Tstat

Blue

Brown

YO

TWV

W

A1

Bard Part #8408-038

A2

W2

Red/White

Pink

Y

RAT

D

G

Optional

CO2 Controller

Dehumidification Wiring Diagram

Red

24VAC

#C7232A1008

Bard Part #8403-056

And Demand Ventilation

With "X" Thermostat Option

Brown

Yellow

Black

Out

Analog

Orange

Green

H200

Humidistat

Plug #4

6

5

3

Red

Purple/White

Black/White

Red/White

12345

Red/White

Red/Yellow

Black/White

6

4

Purple/White

4

5

E

W1/E

D/YO

E

Brown/White

Blue

Yellow

Orange

7

6

Yellow

Orange

Brown/White

Y

G

O1

A

Y1

G

Y1

Y

G

Brown

9

8

Blue

B

O/B

O/B

W1

Brown

W2

AUX

W2

10

11

12

Red/White

Black/White

L

R

C

R

C

R

C

Term. Block

Low Voltage

8403-060

L

L

Thermostat

1

Rc

8403-058

Thermostat

TH5220D1151

FACTORY INSTALLED JUMPER

1

Manual 2100-521B
Page 24 of 48

Factory

Internal

5

R

6

C

W2

Jumpers

B

Factory

Jumpers

Terminal Block

Unit Low Voltage

4

Y

G

O1

W1

Y1

L

E

Thermostat*

Part #8403-060

A

W1/E

D/YO

B

G

Y1

W2

L

R

C

*Note: Thermostat must be configured for: Heat Pump,

MIS-2692 A

CS2000A2, Non-Programmable

No Economizer, Full Time Dehumidification,

FIGURE 19

QH Dehumidification Wiring Diagram

2

Brown/White

Black/White

Red/White

123

Brown/White

Black/White

Red/White

WERV

Ventilation

Option

Plug #3

with 24V Coil

(Field Installed)

Double Pole Relay

C NC

PWR

- +

- +

DOOR NO C NC

PRECOND

PWR

HVAC

MAN.

OVERIDE

(24 HRS)

CS2000A2 and WERV Ventilation Option

With "X" Thermostat Option, CO Controller,

CS2000A2

Energy Monitor

Red

2

CO Controller

Part #8403-056

Black

24 VAC

Yellow

Analog

Brown

Out

Orange

Green

VENT HVAC FAN

NC C NO C N C

REM

- +

NO C NC

AREA OCCUP.

Manual 2100-521B
Page 25 of 48

Plug #2

879

1

2

3

6

4

5

10

11

12

FIGURE 20

Black

Red/Yellow

Brown/White

Purple/White

L

E1

L

E1

Relay Logic Board

G1

Orange

BK

RV

Freeze

Blue

Brown

Yellow

TWV

W

Protect Tstat

Bard Part #8408-038

YO

A1

Red/White

A2

W2

Return Air

Pink

Y

RAT

D

3

2

Thermostat

Red/WhiteRed/White

R

B

Black/White

C

Black/White

4102-064

With "E" Thermostat Option

Dehumidification Wiring Diagram

Manual 2100-521B
Page 26 of 48

Plug #4

Red

Brown/White

Purple/White

Blue

Yellow

Black/White

Red/White

1

2

3

4

Red/Yellow

W1/E

8403-060

Thermostat

Orange

7

5

6

Yellow

Orange

Purple/White

Brown/White

A

G

D/YO

Y1

Brown

9

8

Blue

B

101112

Brown

Red/White

W2

Black/White

L

CGR

Plug #2

9

8

1

2

3

4

7

5

6

10

11

12

FIGURE 21

Black

Red/Yellow

Brown/White

Purple/White

L

E1

L

E1

Relay Logic Board

G1

Orange

Freeze

Blue

Brown

Yellow

BK

TWV

W

RV

Protect Tstat

Bard Part #8408-038

Red/White

Return Air

Pink

Y

A2

YO

RAT

D

W2

G

A1

3

2

Thermostat

Red/WhiteRed/White

R

B

Black/White

C

Black/White

4102-065

Dehumidification Wiring Diagram

With "G" Thermostat Option

Plug #4

1

8403-060

Black/White

Red

Brown/White

Purple/White

Blue

Yellow

Black/White

Red/White

2

3

Red/Yellow

W1/E

Thermostat

Orange

4

Purple/White

D/YO

7

5

6

Yellow

Orange

Brown/White

G

Y1

Brown

9

8

Blue

O/B

Brown

W2

101112

Red/White

Red/White

Red/White

L

R

Block #1

Terminal

Black/White

C

C

Y1

Y

O1

Remove jumper when CS2000A Energy Monitor is installed.

Manual 2100-521B
Page 27 of 48

Plug #2

123

9

7

4

5

8

6

12

11

10

FIGURE 22

Black

Red/Yellow

Brown/White

Purple/White

L

E1

L

E1

Relay Logic Board

G1

Red

Purple/White

Blue

Brown

Yellow

Orange

BK

RV

Freeze

Protect Tstat

Bard Part #8408-038

Brown/White

Red/White

Pink

Y

A2

YO

TWV

W

RAT

D

G

A1

W2

3

2

Return Air

Thermostat

Red/White

R

B

Red/White

Black/White

C

Black/White

4102-066

With "I" Thermostat Option

Dehumidification Wiring Diagram

Red

Black

CO Controller

Manual 2100-521B
Page 28 of 48

Bard Part #8403-056

24 VAC

Blue

Yellow

Black/White

Red/White

1

2

3

Black/White

Green

Plug #4

8403-060

Red/Yellow

Brown/White

W1/E

Thermostat

Red/White

Brown

Yellow

Analog

Orange

Out

Orange

4

D/YO

7

5

6

Yellow

Orange

Purple/White

A

G

Y1

Brown

8

9

10

11

12

Blue

Brown

Red/White

Black/White

B

R

L

C

W2

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 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 charging 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 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 2100-521B
Page 29 of 48

START UP

DESCRIPTION OF STANDARD
EQUIPMENT

Solid State Electronic Heat Pump Control

Provides efficient 30-minute defrost cycle. A thermistor
sensor and speed up terminal for service along with a
10- minute defrost override are standard on the
electronic heat pump control.

High / Low Pressure Switch

Provides refrigerant circuit high pressure and loss of
charge protection. Includes lockout circuit that is
resettable from room thermostat.

Five Minute Compressor Time Delay

Provides short cycle protection for the compressor
which extends compressor life. Built into the electronic
heat pump control as standard.

Service Light

One service light indicates when service is required.

• Check System – detects high or low pressure
switch operation for compressor protection.

OPTIONAL CFM (Q36H1D, Q42H1D,
Q48H1D AND Q60H1D ONLY)

These units are shipped from the factory set to operate at
the optional CFM level shown in Table 9. This provides
lower operating sound levels for non-ducted, free
discharge applications. This CFM level will reduce the
system capacity performance by approximately 2% at
the same energy efficiency.

Rated CFM is required for ducted applications for
maximum performance rating. To obtain full CFM on
these models, connect jumper wire as follows:

1. Disconnect all power to the unit. Failure to do so
may result in damage to the motor.

2. Open return air access panel.

3. Open inner control panel cover.

4. Locate low voltage terminal strip. There is a pink
jumper wire with both ends attached to terminal
marked “G2”. Move one end of the jumper to
terminal “Y”

5. Reverse steps to reassemble.

IMPORTANT INSTALLER NOTE

For improved start-up performance, wash the indoor coil
with a dishwasher detergent.

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 and the
compressor contactor is allowed to energize.

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.
wires as damage may occur.

Do not reverse any of the unit factory

THREE PHASE SCROLL COMPRESSOR
START UP INFORMATION

Scroll compressors, like several other types of
compressors, will only compress in one rotational
direction. Direction of rotation is not an issue with
single phase compressors since they will always start
and run in the proper direction.

However, three phase compressors will rotate in either
direction depending upon phasing of the power. Since
there is a 50-50 chance of connecting power in such a
way as to cause rotation in the reverse direction,

verification of proper rotation must be made.

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

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

All three phase scroll compressors used in the QT
series are wired identically internally. As a result, once
the correct phasing is determined for a specific system
or installation, connecting properly phased power leads
to the same Fusite terminal should maintain proper
rotation direction. The direction of rotation of the
motor may be changed by reversing any two line
connections to the unit.

EC

Manual 2100-521B
Page 30 of 48

SERVICE HINTS

1. Caution user to maintain clean air filters at all
times. Also, not to needlessly close off supply air
registers. This may reduce airflow through the
system, which shortens equipment service life as
well as increasing operating costs and noise
levels.

2. Switching to heating cycle at 75°F or higher
outside temperature may cause a nuisance trip of
the remote reset high pressure switch. Turn
thermostat off, then on to reset the high pressure
switch.

3. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode
before trying to diagnose any reported service
problems.

4. Check all power fuses or circuit breakers to be
sure they are the correct rating.

g. Remove screws that attach the duct work to

the unit flanges.

This unit is equipped with four rollers
mounted to the base. For ease of pulling unit
out from the wall, you may want to remove
the bottom service door which requires
removal of the return air panel, and grip the
front flange of the base pan then pull straight
out.

7. Annual maintenance is required to make sure that
all of the systems are functioning properly.

a. Check to make sure that the drains are not

obstructed in any way.

b. Remove any debris in the condenser section of

the unit.

c. Inspect and clean mist eliminator as described

below.

d. Inspect and wash outdoor coil as necessary.

5. Periodic cleaning of the outdoor coil to permit
full and unrestricted airflow circulation is
essential.

6. Some service requires the need to remove the unit
from the wall including replacement of the indoor
coil and/or the outdoor coil. Also servicing the
outdoor fan motor or fan blade will require
removing the unit from the wall if the unit is
installed at a height that is not easily accessible
from the outside of the building.

In order to remove the unit from the wall the
following procedure must be used:

a. Turn off power to the unit at the remote

location. Some units may have more than one
power supply.

b. Disconnect field wiring at unit terminal block

and remove from unit.

c. Disconnect condensate drain.

d. Remove the lower skirting around the unit.

e. Remove wall mounting brackets from wall on

each side of the unit.

f. If unit is attached to duct work, remove upper

cabinet extension by removing the top center
screw only from the cabinet side panel.

MIST ELIMINATOR SERVICE

A mist eliminator is supplied with the wall sleeve. The
mist eliminator is constructed of an aluminum frame
and mesh. The mist eliminator is located in the top
section of the wall sleeve and can be removed from the
inside of the building without removing the unit from
the wall. This requires that the ventilation package must
be removed.

It is recommended that the mist eliminator be inspected
annually and serviced as required. The mist eliminator
can be inspected from the outside of the building by
looking through the outdoor grille. The mist eliminator
can be serviced from the outside by using a vacuum
cleaner. The outdoor grille must be removed. Use the
vacuum to remove dirt and debris from the surface of
the mist eliminator. If additional cleaning is required,
the mist eliminator will have to be removed from the
sleeve.

The ventilation package will have to be removed to gain
access to the mist eliminator. If the blank off plate
option is used, it is not necessary to service the mist
eliminator. The steps necessary to remove each of the
vent options are listed below.

The mist eliminator can be cleaned by washing with
soap and water. The excess water should be shaken off
the mist eliminator before it is reinstalled.

Manual 2100-521B
Page 31 of 48

VENT OPTIONS

BAROMETRIC FRESH AIR DAMPER (Standard)

Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
fresh air damper assembly can be seen on the back of
the unit. See Figure 23.

1. The fresh air damper is attached to the back of the
unit with one screw on either side of the
assembly. Both of the screws must be removed.

2. Once the mounting screws are removed, tilt the
assembly down and lift it out.

The mist eliminator can be seen through the opening.
The mist eliminator must be raised up and the bottom
can be pulled toward the front of the unit.

COMMERCIAL ROOM VENTILATOR (Option)

Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
commercial room ventilator (CRV) can be seen after the
panel has been removed. The CRV must be removed to
gain access to the mist eliminator.

1. The two mounting screws in the front of the CRV
must be removed.

2. The power connectors for the CRV (located on
the right side of the unit) must be disconnected.
Squeeze the tabs on the sides of the connector
and pull straight out. Unplug both of the
connectors.

3. Slide the CRV straight out of the unit.

The mist eliminator can be seen through the opening in
the back of the unit. The mist eliminator must be raised
up and the bottom can be pulled toward the front of the
unit and removed.

EC

R ENERGY RECOVERY VENTILATOR

QT
(Option)

Before starting, make sure that the power has been
turned off. The return air grille panel must be removed.
The energy recovery ventilator (QERV) can be seen
after the panel has been removed. To gain access to the
mist eliminator, the QERV must be removed. See
Figure 24.

1. The front fill plate of the QERV must be
removed. There is one screw on either side of the
plate. Remove these screws and remove the
plate.

2. On either side of the QERV there are mounting
screws that hold the QERV in place. Remove
both of these screws.

3. Underneath the heat recovery cassette there is a
power connector for the lower blower assembly.
To disconnect this plug, the tabs on both sides of
the plug must be squeezed to release the plug.
While squeezing the tabs, pull the plug out of the
socket.

4. The QERV is plugged into the unit in the right
side of the unit. Both of these plugs must be
disconnected to remove the QERV. Squeeze the
tabs on the sides of the connector and pull
straight out.

5. Slide the QERV assembly straight out of the unit,
being careful not to let the cassette slide out of
the QERV.

The mist eliminator can be seen through the opening in
the back of the unit. The mist eliminator must be raised
up and the bottom can be pulled toward the front of the
unit and removed.

Manual 2100-521B
Page 32 of 48

FIGURE 23

FRESH AIR DAMPER REMOVAL

MOUNTING
SCREW

Manual 2100-521B
Page 33 of 48

FIGURE 24

QERV REMOVAL

MOUNTING
SCREWS

FRONT FILL

POWER

CONNECTORS

LOWER BLOWER

ASSEMBLY POWER

CONNECTOR

Manual 2100-521B
Page 34 of 48

SEQUENCE OF OPERATION

Cooling – Circuit R-Y makes the thermostat pull in the
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 the reversing valve
controls heating cycle operation. Two thermostat
options, one allowing “Auto” change over 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 for R-W1 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 makes
starting indoor blower motor. Heat pump heating cycle
now in operation.

The second option has no “Auto” change over 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.

Reheat Circuit – There is a small capillary tube inserted
between the reheat coil return line and suction line that
will prevent liquid from accumulating in the reheat coil
when it is inactive. This drain does not affect the
normal operation of the system.

There is a check valve located in the reheat coil return
line. It has a soft spring to hold the ball on the seat. This
will make the method of checking the ball freedom with
a magnet difficult. Refer to Figures 26 and 27 for the
location of the check valve and drain back capillary.

When the system is operating in the dehumidification
mode, the suction pressure will be reduced by 4 to 8
psig and the discharge pressure will be reduced by 19 to
22 psig.

Return Air Thermostat – In dehumidification mode if
the return air temperature is lower than 65°, the return
air thermostat closes and brings on stage one electric
heat to maintain 65°.

High / Low Pressure Control provides protection for
the compressor. In the event system pressures go above
600 PSI or below 15 PSI in either cooling or heating
mode the compressor will be stopped. This will activate
the red light located in the control panel. The lockout
circuit will hold compressor off line. When the system
problem is corrected, the unit operation can be restored
by turning of the main power supply off and then back
on, or reset the room thermostat. The low pressure
control has a bypass to eliminate nuisance lockout on
cold start up.

The bypass timer should be set to 120 seconds. This is to
assure there is no nuisance tripping of the low-pressure
control during startup in heating mode under cold
weather conditions.

OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION

The Climate Control Option E is an electronic,
programmable thermostat and a humidistat. This unit
has a refrigerant reheat circuit that is controlled by a 3
way valve.

When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced.
The 3 way valve directs hot discharge gas into a
separate desuperheating condenser circuit that reheats
the conditioned air before it is delivered to the room.
When the humidistat is satisfied, the system switches
back to normal air conditioning mode.

If the thermostat calls for cooling during
dehumidification mode, the call for cooling takes
precedence over the dehumidification and the unit will
cool until the thermostat is satisfied. Once the call for
cooling is satisfied, the unit may continue to
dehumidify.

If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will
energize and the evaporator airflow will return to the
heating airflow. When the thermostat is satisfied, the
electric heaters will turn off and the airflow will be
reduced and the system will continue to dehumidify
until humidistat is satisfied.

If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.

The Climate Control Option I is an electronic,
programmable thermostat, humidistat and CO
controller. This unit has a refrigerant reheat circuit that
is controlled by a 3 way valve.

When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced.
The 3 way valve directs hot discharge gas into a
separate desuperheating condenser circuit that reheats
the conditioned air before it is delivered to the room.
When the humidistat is satisfied, the system switches
back to normal air conditioning mode.

If the thermostat calls for cooling during
dehumidification mode, the call for cooling takes
precedence over the dehumidification and the unit will
cool until the thermostat is satisfied. Once the call for
cooling is satisfied, the unit may continue to
dehumidify.

2

Manual 2100-521B
Page 35 of 48

If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will
energize and the evaporator airflow will return to the
heating airflow. When the thermostat is satisfied, the
electric heaters will turn off and the airflow will be
reduced and the system will continue to dehumidify
until humidistat is satisfied.

If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.

The CO2 controller will energize the vent option and the
ID blower when the room CO
Default CO2 set point is 1000 ppm. See Figure 25.

levels rise over set level.

2

FIGURE 25

CONTROLLER - FACTORY SET TO 1000 PPM

CO

2

SW2SW1OU T AN

VOLTAGE

CURRENT

ON

ON

20-100%

0-100%

OFF

OFF

When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced.
The 3 way valve directs hot discharge gas into a
separate desuperheating condenser circuit that reheats
the conditioned air before it is delivered to the room. If
the return air thermostat sensed a temperature below 65°
during dehumidification, the fist stage electric heaters
are brought on to raise the return air temperature above
65°. When the humidistat is satisfied, the system
switches back to normal air conditioning mode.

If the thermostat calls for cooling during
dehumidification mode, the call for cooling takes
precedence over the dehumidification and the unit will
cool until the thermostat is satisfied. Once the call for
cooling is satisfied, the unit may continue to
dehumidify.

If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will
energize and the evaporator airflow will return to the
heating airflow. When the thermostat is satisfied, the
electric heaters will turn off and the airflow will be
reduced and the system will continue to dehumidify
until humidistat is satisfied.

If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.

"SW2" SET TO ON

"SW1" SET TO ON "OUT" S ET TO 20-100%

"AN" SET TO VOLTAGE

MIS-2667

The Climate Control Option G has a non-programmable
electronic thermostat, humidistat and is compatible for
use with a CS2000A* Energy Control Monitor. This
unit has a refrigerant reheat circuit that is controlled by
a three-way valve.

Unit operation is controlled by the thermostat and
humidistat, and optional CS2000A* Energy Monitor
Controller can be easily integrated by simple connection
to the low voltage terminal block provided. See Figure

21.

NOTE: The CS2000A* (or other means for ventilation

control) must be used if any mechanical
(motorized) ventilation options are installed.

Dehumidification can be set to be available only when
CS2000A* is active or to be available continuously by
switching a jumper on the relay logic board. See notes
on Table 12.

REFRIGERANT TUBE SCHEMATIC FOR
REHEAT COIL

Figure 26 shows the refrigerant gas flow through the
reheat coil during the dehumidification mode.

When the unit is in standard cooling (Figure 27) or
heating mode the reheat coil is inactive.

PRESSURE SERVICE PORTS

High and low pressure service ports are installed on all
units so that the system operating pressures can be
observed. Pressure curves can be found later in the
manual covering all models on both cooling and heating
cycles. It is imperative to match the correct pressure
curve to the unit by model number. Upper and lower
service doors must be attached to obtain proper reading.

Manual 2100-521B
Page 36 of 48

FIGURE 26

QTEC DEHUMIDIFICATION MODE CIRCUIT DIAGRAM

Manual 2100-521B
Page 37 of 48

FIGURE 27

QTEC COOLING MODE CIRCUIT DIAGRAM

Manual 2100-521B
Page 38 of 48

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.

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 30
minute pin. If circumstances require a change to
another time, remove the wire from the 30-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.

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 artificial 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.

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 first (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 built­in lockout system that allows the unit to have the high
pressure 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 2100-521B
Page 39 of 48

FIGURE 28

DEFROST CONTROL BOARD

LOW PRESSURE BYPASS TIMER SWITCH
(FACTORY SETTING 120 SECONDS)

SW1SW

OFF

ON

OFF

ON

OFF

2 TIME (SEC)

OFF
OFF

ON
ON

30
60

120*

180

ON

Manual 2100-521B
Page 40 of 48

ACCUMULATED RUN TIME SELECTOR
(FACTORY SETTING 30 MIN.)

MIS-2684 A

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE

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

TROUBLESHOOTING

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TABLE 5

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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.

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.

LED BLINK CODES

BLINK FUNCTION

Slow Normal function (1.0 sec on/1.0 sec off)
Fast ASCD 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

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Manual 2100-521B
Page 41 of 48

CHECKING TEMPERATURE SENSOR

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.

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

TEMPERATURE (F) VS RESISTANCE (R) OF TEMPERATURE SENSOR

FR FR FR FR FR

0.52-

0.42-

0.32-

0.22-

0.12-

0.02-

0.91-

0.81-

0.71-

0.61-

0.51-

0.41-

0.31-

0.21-

0.11-

0.01-

0.9-

0.8-

0.7-

0.6-

0.5-

0.4-

0.3-

0.2-

0.1-

0.0

0.1

0.2

0.3

0.4

178691
990091
585381
813771
982171
784561
409951
925451
553941
473441
675931
659431
605031
912621
980221
801811
272411
575011
010701
475301
062001
46079

18939
80019
93188

17358
99628

12108
23677
03257

0.5

0.6

0.7

0.8

0.9

0.01

0.11

0.21

0.31

0.41

0.51

0.61

0.71

0.81

0.91

0.02

0.12

0.22

0.32

0.42

0.52

0.62

0.72

0.82

0.92

0.03

0.13

0.23

0.33

0.43

01927
07607
70586
81466
99346
94426
56506
54785
58965
48255
04635
15025
41505
82094
09541
00264
55844
45534
59224
77014
89893
75783
25673
38563
84553
54543
47533
43623
32713
04803

TABLE 6

0.53

0.63

0.73

0.83

0.93

0.04

0.14

0.24

0.34

0.44

0.54

0.64

0.74

0.84

0.94

0.05

0.15

0.25

0.35

0.45

0.55

0.65

0.75

0.85

0.95

0.06

0.16

0.26

0.36

0.46

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.

68992
75192
55382
77572
32862
28062
38352
69642
03042
48332
85722
05122

16512
98902
53402
69891
47391
76881
57381
98971
43471
48961
74561
22161
01751
01351

12941
44541
77141
02831

0.56

0.66

0.76

0.86

0.96

0.07

0.17

0.27

0.37

0.47

0.57

0.67

0.77

0.87

0.97

0.08

0.18

0.28

0.38

0.48

0.58

0.68

0.78

0.88

0.98

0.09

0.19

0.29

0.39

0.49

47431
73131
01821
29421
38121
38811

19511

70311

13011

26701

10501
74201
00001
0679
6258
9929
7709
2688
3568
9448
0528
7508
9687
6867
7057
4337
5617
0007
0486
3866

0.59

0.69

0.79

0.89

0.99

0.001

0.101

0.201

0.301

0.401

0.501

0.601

0.701

0.801

0.901

0.011

0.111

0.211

0.311

0.411

0.511

0.611

0.711

0.811

0.911

0.021

0.121

0.221

0.321

0.421

1356
3836
9326
8906

1695
7282
7964
0755
6445
6235
8025
4905
2894
3784
7674
3667
2654
4644
7634
4727
2814
3904
6004

1293
8383
7573
8763

1063
6253
2543

Manual 2100-521B
Page 42 of 48

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

• Motor rocks, • Check for loose or compliant motor mount
but won’t start

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

• 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

• Make sure blower wheel is tight on shaft

• Perform motor/control replacement check

(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

Symptom Cause/Procedure

• Noisy blower or cabinet • Check for loose blower housing, panels, etc.

• “Hunts” or “puffs” at • Does removing panel or filter reduce
high CFM (speed)

Evidence of Moisture

• Motor failure or • Replace motor and

Check

malfunction has occurred
and moisture is present

• Evidence of moisture • Perform Moisture Check
present inside air mover

• High static creating high blower speed?

- Check for air whistling through seams in
ducts, cabinets or panels

- Check for cabinet/duct deformation

“puffing”?

- Reduce restriction

- Reduce max. airflow

Perform Moisture

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

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

½"

• “Hunts” or “puffs” at • Does removing panel or filter reduce
high CFM (speed) “puffing”?

• 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

• Stays at high CFM • “R” missing/not connected at motor

• Blower won’t shut off •

Excessive noise • Determine if it’s air noise, cabinet, duct or

• Air noise • High static creating high blower speed?

- Reduce restriction

- Reduce max airflow

delay complete

• “R” missing/not connected at motor

• Perform motor/control replacement check

• Is fan in delay mode? - wait until delay time
complete

• Perform motor/control replacement check

Current leakage from controls into G, Y or W?
Check for Triac switched thermostat or solid­ state relay

motor noise; interview customer, if necessary

- Is airflow set properly?

- Does removing filter cause blower to slow
down? Check filter

- Use low-pressure drop filter

- Check/correct duct restrictions

• Size the equipment wisely • Oversize system, then compensate with low
airflow

• Check orientation before • Plug in power connector backwards

inserting motor connectors • Force plugs

Moisture Check

• Connectors are oriented “down” (or as recommended by equipment

manufacturer)

• Arrange harness with “drip loop” under motor

• Is condensate drain plugged?

• Check for low 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?

Manual 2100-521B
Page 43 of 48

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 specific 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 ¼" hex head bolts at the rear of the control
housing (at the back end of the control opposite the shaft end). Refer to
Figure 29. 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 forefinger, 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 30. (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. Finish installing 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.

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.

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

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
final 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 31.

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.

Back of
Control

Figure 30

Figure 4

Winding Test

Motor OK when
R > 100k ohm

Figure 31

Figure 5

Drip Loop

Connector Orientation

Between 4 and 8 o'clock

Drip Loop

Only remove
Hex Head Bolts

ECM 2.0

Note:
Use the shorter
bolts and
alignment pin
supplied when
replacing an
ECM 2.0
control.

Figure 29

Figure 3

Control Disassembly

Push until
Latch Seats
Over Ramp

ECM

2.3/2.5

Hex-head Screws

From Motor

Circuit

Board

Motor

Motor Connector
(3-pin)

Control Connector

(16-pin)
Power Connector
(5-pin)

Motor Connector
(3-pin)

Manual 2100-521B
Page 44 of 48

FAN BLADE SETTING DIMENSIONS

LEDOM

DETAR

MFC

DOF°59

ERUTAREPMET

DOF°28

ERUTAREPMET

D1H42Q00852-3242-22
D1H03Q000152-3252-32
D1H63Q002112-9191-71
D1H24Q002181-6171-51
D1H84Q004112-9112-91
D1H06Q055142-2242-22

REFRIGERANT CHARGE

Any service work requiring removal or adjustment in
the fan and/or motor area will require that the
dimensions in Table 7 be checked and blade adjusted in
or out of the motor shaft accordingly.

FIGURE 32

FAN BLADE SETTING

TABLE 7

FAN BLADE DIMENSIONS

ANOISNEMID

LEDOM

D1H42Q057.
D1H03Q057.
D1H63Q057.
D1H24Q057.
D1H84Q057.
D1H06Q057.

)SEHCNI(

The correct system R-410A charge is shown on the unit
rating plate. Optimum unit cooling performance will
occur with a refrigerant charge resulting in a subcooling
as shown in Table 8. If correct charge is in doubt,
recover the refrigerant and recharge per the charge on
the unit rating plate.

TABLE 8

SUBCOOLING AT LIQUID LINE

ledoMPSEdetaR

D1H42Q

6

D1H03Q
D1H63Q
D1H24Q
D1H84Q
D1H06Q

NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjust itself to maintain

1 Maximum ESP (inches WC) shown is with 1" thick disposable filter (reduced by .2 for 2" filter).

2 Rated CFM for ducted applications – required for maximum performance rating. To obtain full CFM on models Q36H1D, Q42H1D, Q48H1D

and Q60H1D connect the pink jumper wire (provided) to terminal #G2 and #Y on the low voltage terminal block located in the circuit breaker
box.

3 Optional CFM – the unit is shipped from the factory set to operate at the optional CFM level shown. This provides lower operating sound

levels for non-ducted, free discharge applications. This reduces system capacity performance by approximately 2% at the same energy

efficiency.

4 Continuous fan CFM is the total air being circulated during continuous fan mode.

5 Indoor airflow during periods of high humidity when system is operating under control of optional humidistat for maximum humidity reduction.

6 Model Q24H1D – when operating on 2nd stage heating the indoor air will increase to 1000 CFM.

approximately the same rate of indoor airflow in both heating and cooling, dry and wet coil conditions and at
both 230/208 or 460 volts.

01.5.0008-----008008007

51.8.00001-----00010001019

51.8.000210001000100015711

51.8.000210001000100015711

51.8.000410521001105215711

02.5.005510521001105210041

TABLE 9

INDOOR BLOWER PERFORMANCE

1

PSE.xaM

2

3

detaR

MFC

lanoitpO

MFC

4

5

suounitnoC

MFC

noitacifidimuheD

MFC

Manual 2100-521B
Page 45 of 48

@MFC

PXE.xaM

TABLE 10

8
5

7
9

2
8

6

1

5
5

0
5

8
8

8
2

3
2

6
9

5
4

0
5

6
0

5
5

0
6

6
7

5
2

0
3

COOLING PRESSURE

(All Temperatures in Degrees F)

riAnruteR

ledoM

erutarepmeT

BD.ged57

BW.ged26

D1H42Q

BD.ged08
BW.ged76

BD.ged58

BW.ged27

BD.ged57

BW.ged26

D1H03Q

BD.ged08

BW.ged76

BD.ged58

BW.ged27

BD.ged57

BW.ged26

D1H63Q

BD.ged08

BW.ged76

BD.ged58

BW.ged27

BD.ged57

BW.ged26

D1H24Q

BD.ged08

BW.ged76

BD.ged58

BW.ged27

BD.ged57

BW.ged26

D1H84Q

BD.ged08

BW.ged76

BD.ged58

BW.ged27

BD.ged57

BW.ged26

D1H06Q

BD.ged08

BW.ged76

BD.ged58

BW.ged27

Low side pressure ± 2 psig
High side pressure ± 5 psig

Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge
being in the system, the charge should be removed, system evacuated and recharged to serial plate instructions.

 75°F outdoor temperature condenser fan motor is running on low speed.

When the system is operating in the dehumidification mode, the suction pressure will be reduced by 4 to 8 psig and the discharge
pressure will be reduced by 19 to 22 psig.

Manual 2100-521B
Page 46 of 48

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ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

ediSwoL

ediShgiH

08580959001501011511

1

221
963

031
873

531

193

221
063

131

963
631

283
221

763
031

673
531

983
811

273
621

283
031

593
911

273
721

283

131

593
801

873
511

883
911

204

121

873
921

883
431

204
321

773
231

783
731

104

421
093

331
004

831
414

121

493
921

404
431

814
221

493
031

404
531

814
901

593
711

504

121

914

121
193

921

104

431
514

421
893

331
804

831
224

821
314

731
424

241
934

321
614

231
724

731
244

421
714

331
824

831
344

111

314
911

424
321

934

121
704

921
714

431
234

621
914

531
034

041
544

031
734

931
844

441
464

521
044

431
154

931
764

721
244

631
354

141
964

411
534

221
644

621
264

221
624

031
734

531
254

821
444

731
554

241

174

331
064

241
274

741
984

821
564

731
774

241
494

031
764

931
974

441
694

611
854

421
074

821
684

221
944

131

064
631

674
031

074
931

284
441

994
531

584
441

794
941

415
031

194

931
405

441
225

231
394

141

605
641

425
911

584
721

794

131

415

321
474

231
684

731
305

231
894

141
115

641
925

731
805

641

125
151

935
231

025

141

335
641

255
431

225
341

535
841

455

121

315
921

625
431

445

521

21

305

35
31

431

45

615

41

931

65

435
431

31

825

65

41

341

75

245

51

841

95

165

731

31

335

55
41

741

75

745

51

251

95

665
431

31

945

75
41

341

95

365

51

841

16

385
531

31

055

85
41

441

95

465

51

941

16

485
321

21

445

75
31

231

95

855

41

731

16

875

ledoM

3
8

2
8

1

3
7

9
9

6
7

2

D1H42Qged07

D1H03Qged07

D1H63Qged07

D1H24Qged07

D1H84Qged07

D1H06Qged07

TABLE 11

HEATING PRESSURE

(All Temperatures in Degrees F)

riAnruteR

.pmeTerusserP05015102520353045405550656

ediSwoL

53

24

94

65

26

96

67

38

98

69

301

011

611

372

482

592

703

813

923

043

153

263

473

583

693

ediShgiH

ediSwoL

33

04

74

45

16

76

47

18

88

59

201

872

092

303

513

723

043

253

463

773

983

ediShgiH

ediSwoL

33

04

74

35

06

76

47

08

78

662

572

582

592

503

513

523

433

ediShgiH

ediSwoL

92

63

24

94

65

36

07

562

572

682

692

603

713

ediShgiH

ediSwoL

13

73

44

15

85

862

082

192

203

ediShgiH

ediSwoL

22

03

73

752

072

ediShgiH

282

413

44

25

592

803

723

46

17

523

633

95

66

023

333

443

77

38

733

743

87

58

843

953

37

18

643

853

104

49

001

453

463

09

79

853

863

29

89

073

283

88

59

173

483

704

901

611

414

624

701

411

473

483

401

111

873

983

501

211

393

404

301

011

693

904

21
14

21
34

21

93
11

93
11

14
11

24

Manual 2100-521B
Page 47 of 48

TABLE 12

Inputs to Board Outputs from Board

DEHUMIDIFICATION RELAY LOGIC BOARD

Cooling takes precedence over dehumidification. A cooling call will cancel dehumidification.

Dehumidification takes precedence over first stage heating.

A second stage heating call cancels dehumidification.

2.3.4.

The relay logic board has a jumper on it to choose between fulltime dehumidification and

occupied dehumidification only. With the jumper in the 1-2 position dehumidification is available

fulltime. With the jumper in the 2-3 position dehumidification is available only when the room is

occupied. The room is considered occupied when the A1 terminal is energized.

These outputs will be energized if the jumper is in the full time dehumidification position. They

will be off if the jumper is in the occupied dehumidification only position.

5.

Notes G Y B W2 E1 A1 D RAT G1 BK YO RV W E1 A2 TWV

Cooling Mode Unoccupied 1 X X X X X X X

Cooling Mode Occupied 1 X X X X X

1st Stage Heating Occupied 2 X X X X X X X X X

1st Stage Mode Unoccupied 2 X X X X X X X

Manual 2100-521B
Page 48 of 48

Notes 1.

Dehumidification Occupied 4 X X X X X X

Dehumidification Unoccupied 4 X 5 5 5 5

2nd Stage Heating Occupied 3 X X X X X X X X X X X

2nd Stage Mode Unoccupied 3 X X X X X X X X X

Emergency Heat X X X X X X

Dehumidification w/ RAT closed X X X X X X X

Fan Only Unoccupied X X

Fan Only Occupied X X X X