Bard Q36H3-A, Q24H3-B, Q36H3-B, Q43H3-A, Q43H3-B Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Q-TECTM SERIES

PACKAGED HEAT PUMP

Models:

Q24H3-A
Q24H3-B
Q24H3-C

Q30H3-A
Q30H3-B
Q30H3-C

Q36H3-A
Q36H3-B
Q36H3-C

Q43H3-A
Q43H3-B
Q43H3-C

Q48H3-A
Q48H3-B
Q48H3-C

Q60H3-A
Q60H3-B
Q60H3-C

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

www.bardhvac.com

Manual No.: 2100-652A
Supersedes: 2100-652
Date: 10-11-17

Page 1 of 42

CONTENTS

Getting Other Information and Publications ........ 3

Q-TEC Series General Information ........................... 4

Q-TEC Model Nomenclature ..................................... 4

Shipping Damage .................................................... 7

Unit Removal from Skid ........................................... 7

Handling Unit After Removal from Skid ..................... 8

General .................................................................. 8

Minimum Installation Height .................................... 8

Duct Work............................................................. 10

Filters .................................................................. 10

Fresh Air Intake .................................................... 11

Service Light ......................................................... 11

Condensate Drain .................................................. 11

Optional Rear Drain Kits ........................................ 11

Installation ................................................................. 18

Mounting the Unit ................................................. 18

Wiring – Main Power .............................................. 19

Wiring – Low Voltage .............................................. 19

Optional Climate Controls Sequence of Operation ..... 19

Low Voltage Connections ........................................ 20

General ................................................................ 20

Figures

Figure 1 Unit Dimensions .................................. 6

Figure 2 Air Seal on Bottom of Unit .................... 7

Figure 3 Removal of Unit from Skid.................... 7

Figure 4 Unit on Appliance Cart for Moving ......... 8

Figure 5 Installation With Duct-Free Plenum ....... 9

Figure 6 Ducted Application .............................. 9

Figure 7 Supply Duct Connections.................... 10

Figure 8 Filter Location ................................... 10

Figure 9 Optional Side Drain............................ 12

Figure 10 Standard Rear Drain .......................... 12

Figure 11 Rear Drain (Top View) ........................ 12

Figure 12A Optional Rear Drain Kit ......................13

Figure 12B Optional Rear Drain Kit ...................... 14

Figure 12C Optional Rear Drain Kit ...................... 15

Figure 12D Optional Rear Drain Kit ...................... 16

Figure 13A Unit Mounting – Method 1 .................. 17

Figure 13B Unit Mounting – Method 2 .................. 17

Figure 14

Figure 15 Component Location .......................... 19

Figure 16 Thermostat Plug Terminals ................. 21

Figure 17A T-Stat Wiring Diagram "X" Opt. ........... 22

Figure 17B

Figure 18 T-Stat Wiring Diagram "D" Opt. .......... 24

Figure 19 T-Stat Wiring Diagram "H" Option ....... 25

Figure 20 T-Stat Wiring Diagram "B" or "C" Opt. .. 26

Figure 21 Fresh Air Damper Removal ................. 31

Figure 22 QERV Removal .................................. 32

Figure 23 CO

Figure 24 Defrost Control Board ......................... 35

Figure 25 Control Disassembly ........................... 39

Figure 26 Winding Test ..................................... 39

Figure 27 Drip Loop .......................................... 39

Figure 28 Fan Blade Setting .............................. 40

Removing Locking Screws from Wheels .

T-Stat Wiring Diagram "X" Opt. w/Demand .

Controller ................................... 33

2

18

23

Start Up ....................................................................... 27

R-410A Refrigerant: General .................................. 27

Topping Off System Charge .................................... 27

Safety Practices .................................................... 27

Description of Standard Equipment ......................... 28

Optional CFM (Q36, Q42, Q48 and Q60 Only) ......... 28

Important Installer Note ......................................... 28

Phase Monitor ....................................................... 28

Three Phase Scroll Compressor Start Up Info. ......... 28

Service Hints ........................................................ 29

Mist Eliminator Service .......................................... 29

Vent Options ......................................................... 30

Sequence of Operation ........................................... 33

Pressure Service Ports ........................................... 34

Defrost Cycle .........................................................34

Troubleshooting .........................................................36

Solid State HP Control Troubleshooting Procedure .....36

Checking Temperature Sensor ..................................37

Troubleshooting ECM™ Blower Motors .....................38

Fan Blade Setting Dimensions .................................40

Refrigerant Charge ..................................................40

Tables

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

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

Table 3 Operating Voltage Range ...........................19

Table 4 Wall Thermostats .....................................21

Table 5 Troubleshooting ........................................36

Table 6 Temp. vs Resistance of Temp. Sensor .........37

Table 7 Fan Blade Dimension ...............................40

Table 8 Indoor Blower Performance .......................40

Table 9 Cooling Pressure ......................................41

Table 10 Heating Pressure ......................................42

Manual 2100-652A
Page 2 of 42

GETTING OTHER INFORMATION AND PUBLICATIONS

These publications can help when installing the air
conditioner or heat pump. They can usually be found
at a local library or can be purchased directly from the
publisher. Be sure to consult the most 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 2100-652A
Page 3 of 42

Q-TEC SERIES GENERAL INFORMATION

Q-TEC MODEL NOMENCLATURE

Q 36 H 3 – A 10 X X V X X X

COIL OPTIONS

X – Standard

MODEL
NUMBER

CAPACITY |

24 – 2 Ton
30 – 2½ Ton
36 – 3 Ton
43 – 3½ Ton
48 – 4 Ton
60 – 5 Ton

HEAT
PUMP

REVISION

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
V – Commercial Ventilator – Motorized w/Exhaust
Spring Return
P – Commercial Ventilator – Motorized w/Exhaust
Power Return
R – Energy Recovery Ventilator w/Exhaust

X – 1" Fiberglass
(Standard)
F – 2" Fiberglass
P – 2" Pleated

COLOR OPTIONS

V – Platinum w/Slate
Front (Vinyl)
X – Beige paint
4 – Gray paint

CLIMATE CONTROL OPTIONS

X – None
D – Electronic/Prog/Man/Auto
H – Electronic/Prog/Man/Auto with CO
B – Electronic/Prog/Humidistat/BACNet
C – Electronic/Prog/Humidistat/BACNet/CO

1 – Phenolic coated
evaporator*

2

– Phenolic coated

condenser
3 – Phenolic coated

evaporator and
condenser coil*

*and reheat if
applicable

I

NTERNAL CONTROLS

X – Standard

• High Pressure Switch

• Low Pressure Switch

• Compressor Time Delay
E – Low Ambient Control
Q – Outdoor Thermostat
R – Low Ambient Control and
Outdoor Thermostat

2

2

TABLE 1

Factory Built-In Electric Heat

(See Table 2 for available electric heat by unit model)

Nominal

KW

KW

5.0 5.0 20.8 17,065 3.75 18.0 12,799

6.0 6.0 14.4 20,478 4.50 12.5 15,359 6.0 7.2 20,478 5.52 6.9 18,840

9.0 9.0 21.7 30,717 6.75 18.7 23,038 9.0 10.8 30,717 8.28 10.4 28,260

10.0 10.0 41.7 34,130 7.50 36.1 25,598

12.0 12.0 28.9 40,956 9.00 25.0 30,717 12.0 14.4 40,956 11.04 13.9 37,680

15.0 15.0 62.5 36.1 51,195 11.25 54.1 31.2 38,396 15.0 18.0 51,195 13.80 17.3 47,099

 These electric heaters are available in 230/208V units only.
 These electric heaters are available in 480V units only.

At 240V  At 208V  At 480V  At 460V 

1-Ph

Amps

3-Ph

Amps

BTUH KW

1-Ph

Amps

3-Ph

Amps

BTUH KW

3-Ph

Amps

BTUH KW

3-Ph

Amps

BTUH

Manual 2100-652A
Page 4 of 42

TABLE 2

Electrical Specifications

No.

Field

Power

Circuits

1 or 2

1
1

1
1

1 or 2

1
1
1
1

1
1
1
1

1

1
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1

1 or 2
1 or 2
1 or 2

1

1

1

1

1

1

1

1

1
1 or 2
1 or 2
1 or 2

1

1

1

1



Minimum

Circuit

Ampacity

22
47
72

17
35
44

10
19
23

27
52
77

19
37
46
55

13
22
26
31

27
52
77
81

20
38
47
51

14
23
28
28

31
57
81
83

26
44
53
53

13
22
27
27

35
60
85
85

28
47
56
56

15
24
28
28

46
71
96
96

34
60
60

17
31
31

MODEL

Q24H3-A0Z

A05
A10

Q24H3-B0Z

B06
B09

Q24H3-C0Z

C06
C09

Q30H3-A0Z

A05
A10

Q30H3-B0Z

B06
B09
B12

Q30H3-C0Z

C06
C09
C12

Q36H3-A0Z

A05
A10

 A15

Q36H3-B0Z

B06
B09

 B15

Q36H3-C0Z

C06
C09

 C15

Q43H3-A0Z

A05
A10

 A15

Q43H3-B0Z

B06
B09

 B15

Q43H3-C0Z

C06
C09

 C15

Q48H3-A0Z

A05
A10

 A15

Q48H3-B0Z

B06
B09

 B15

Q48H3-C0Z

C06
C09

 C15

Q60H3-A0Z

A05
A10

 A15

Q60H3-B0Z

B09

 B15

Q60H3-C0Z

C09

 C15

Rated

Volts &

Phase

230/208-111

230/208-311

460-3

230/208-111

230/208-3

460-3

230/208-1

230/208-3

460-3

230/208-1

230/208-3

460-3

230/208-1

230/208-3

460-3

230/208-1

230/208-311

460-3

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

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.

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

Single Circuit Dual Circuit



Maximum

External

Fuse or Ckt.

Brkr.

30
50
80

20
35
45

15
20
25

35
60
80

25
40
50
60

15
25
30
35

40
60
80
90

30
40
50
60

15
25
30
30

45
60
90
90

35
50
60
60

15
25
30
30

50
70
90
90

40
50
60
60

20
25
30
30

60

90
100
100

45

60

60

25

35

35



Field

Power

Wire Size

10

8
4

12

8
8

14
12
10

8
8
4

10

8
8
6

14
10
10

8
8

6
4
4

10

8
8
6

14
10
10
10

8
6
4
4

8
8
6
6

14
10
10
10

8
6
4
4

8
8
6
6

12
10
10
10

8
4
3
3

8
6
6

10

8
8

 Minimum



Ground

Wire

10
10

8 22 50 30 50 10 8 10 10

12
10
10

14
12
10

10
10

8 27 50 30 60 10 8 10 10

10
10
10
10

14
10
10
10

10
10

8
8

10
10
10
10

14
10
10
10

10
10

8
8

10
10
10
10

14
10
10
10

10

8
8
8

10
10
10
10

12
10
10
10

10

8
8
8

10
10
10

10
10
10

Circuit

Ampacity

Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B

27315050404050

31335050454550

35
35
35

46
46
46

25
50
50

25
50
50

 Maximum

External Fuse or

Ckt. Breaker

50

50

50

25

50

50

50

50

60

25

60

50

60

50



Field Power

Wire Size

8
8

8
8

10

8
8
8

10

8
8
8

8
8

8
8

8
8

8
8



Ground

Wire Size

101010

101010

10
10
10

10
10
10

10

10

10
10
10

10
10
10

Manual 2100-652A
Page 5 of 42

FIGURE 1

Unit Dimensions

Manual 2100-652A
Page 6 of 42

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 Q-TEC Unit

Air Seal

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
the front wheels hang over the edge of the skid (see

FIGURE 3

Removal of Unit from Skid

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.

Hold skid

down

A Shipping brackets B Front wheels over edge C Front wheels on floor

Manual 2100-652A
Page 7 of 42

HANDLING UNIT AFTER REMOVAL
FROM SKID

WARNING

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.

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 oor 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 cannot 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

ee Figure 4). The blade of the appliance cart should

(s

FIGURE 4

Unit on Appliance Cart

Q-TEC Unit

(Right Side)

Strap

Appliance
Cart

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 Q-TEC
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.

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.

Compressor

Manual 2100-652A
Page 8 of 42

MINIMUM INSTALLATION HEIGHT

The minimum installation height of the unit with a Free
Blow Plenum is 8' 6". This provides enough clearance
for the plenum to be removed (see Figure 5).

The minimum installation height for ducted
applications is 8' 4-1/2". This provides enough
clearance to install the duct work (see Figure 6).

FIGURE 5

Installation with Duct-Free Plenum

FIGURE 6

Ducted Application

Manual 2100-652A
Page 9 of 42

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 1" 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.

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 air flow 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" throw away filters [(1) 16x16 and (1) 16x20]
are supplied with each unit. The filters slide into filter
brackets (see Figure 8).

The Q-TEC series heat pump has provision to attach a
supply air duct to the top of the unit. Duct connection
size is 12" x 20". 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

Supply duct
(field supplied)

Attachment
screws (field
supplied)

Room side of
Q-TEC unit

Duct flange provided
with unit

The filters are serviced from the inside of the building
by opening the hinged door. This door is attached by
T-25 torx screw and one locking latch.

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

FIGURE 8

Filter Location

Filters

NOTE: Unit cabinet, supply air duct and duct free

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

The Q-TEC 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.

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.

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

Manual 2100-652A
Page 10 of 42

Return Air Grille

FRESH AIR INTAKE

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, re-insert 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.

The rear drain can be used with wall thickness of up
to 10" 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:

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 30.

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
Sequence of Operation for details.

CONDENSATE DRAIN

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.

• 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: Models equipped with a refrigerant subcooler in
the lower drain pan may experience a 2-3% 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.

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.

Manual 2100-652A
Page 11 of 42

FIGURE 9

Optional Side Drain (Side View)

Q-TEC UNIT

FIGURE 10

Standard Rear Drain

FIGURE 11

Rear Drain (Top View)

Drain Line

Sleeve

Water
Trap

Wall (maximum
10" for rear drain)

Couplings not
shown but
recommended
for ease of
removability for
service

Wall
Bracket

Unit

Manual 2100-652A
Page 12 of 42

MIS-2469

DRAIN BOX

WALL SLEEVE

OVERFLOW TUBE

CAULK AROUND TUBE

FIGURE 12A

Manual 2100-652A
Page 13 of 42

SUPPLIED WITH DRAIN BOX KIT

3/4" PLASTIC PIPE NIPPLE

HORIZONTAL TO FLOOR)

(TIGHTEN THREADS SO TEE IS

THREADS)

(APPLY TEFLON TAPE TO

REAR DRAIN CONNECTION IN
Q/Tec PRODUCT

1/2" SLIP X 1/2" SLIP X 3/4" NPT
TEE SUPPLIED WITH DRAIN BOX KIT

PLUG INSTALLED IN
SIDE Q/Tec DRAIN

MIS-2470

FIGURE 12B

Manual 2100-652A
Page 14 of 42

IMPORTANT!

MIS-2471 A

REMOVE KNOCK-OUT FOR
INDOOR DRAIN HOSE CONNECTOR

FIGURE 12C

(If used)

Manual 2100-652A
Page 15 of 42

DRAIN PAN.

DRAIN HOSE FROM INDOOR

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 A

FIGURE 12D

Manual 2100-652A
Page 16 of 42

Washer

Sleeve

Stud

MIS-2689

Nut

Lower Control Panel

Condenser

Door (Removed)

Return Grille

Bottom Trim

Piece

Bottom Trim

Extension

FIGURE 13A

Unit Mounting – Method 1

Side Trim
(2 PCS.)

Side Trim
(2 PCS.)

Mounting
Bracket

Enlarged view of mounting bracket showing

sleeve to cabinet attachment

Mounting Bracket

Wall
Sleeve

#8 Screw

Provided

(Light Color)

Cabinet Side
Panel

#10 Hex

Head Screw

Provided

FIGURE 13B

Unit Mounting – Method 2

Manual 2100-652A
Page 17 of 42

INSTALLATION

MOUNTING THE UNIT

When installing a Q-TEC unit near an interior wall on
the left side, a minimum of 8" is required but 12" is
preferred.

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

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 Q-TEC.
For 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 (see
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 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" but greater than 10.5". 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" and

10.5", a side trim extension piece kit, model
QSTX42, is available.

Manual 2100-652A
Page 18 of 42

FIGURE 14

Removing Locking Screws from Wheels

Remove screws from wheels

before rolling into place

WIRING – MAIN POWER

Refer to the unit rating plate and/or Table 2 for wire
sizing information and maximum fuse or 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 circuit breaker that is to be used with
the equipment. The correct size must be used for
proper circuit protection and also to assure that there
will be no nuisance tripping due to the momentary high
starting current of the compressor motor.

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

See START UP section for information on three phase
scroll compressor start-ups.

FIGURE 15

Component Location

Side Field
Wire Entrance

Electric
Heaters

Unit

Mounted

Thermostat

Location

Dehumidification

Control (Optional)

Remote
Thermostat
Terminal
Block

Indoor
Blower

Circuit Breaker
Panel and
Controls

Lower
Control
Panel

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

TAP RANGE

240V 253 – 216

208V 220 – 187

NOTE: The voltage should be measured at the field

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

OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION

The standard Climate Control Option X is a remote
thermostat connection terminal block. See Figure 17A
on page 22 for wiring diagram. Compatible thermostats
are listed in Table 4 on page 21. See Figure 17B on
page 23 for Remote CO

Climate Control Option D is an electronic,
programmable thermostat. The subbase of the
thermostat is factory wired to the front panel of the
unit. See Figure 18 on page 24 for wiring diagram. It
is compatible for use with Energy Recovery Ventilator
or Economizer. The thermostat can be set in the
heat, cool or automatic mode. When the thermostat
is set in the heat mode, it can heat only to maintain
the temperature set on the thermostat. When the
thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
When the thermostat is set in the automatic mode,
the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.

Climate Control Option H is an electronic,
programmable thermostat and a CO
subbase of the thermostat and CO
factory wired to the front panel of the unit. See Figure
19 on page 25 for wiring diagram. The thermostat can
be set in the heat, cool or automatic mode. When the
thermostat is set in the heat mode, it can heat only to
maintain the temperature set on the thermostat. When
the thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.

Sensor Connection.

2

controller. The

2

controller are

2

Manual 2100-652A
Page 19 of 42

When the thermostat is set in the automatic mode,

FG

CG

HB

V1

EE

the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.

control options. If the climate control option is
abandoned and connections are made directly to P2
both pins 6 and 1 of P2 must be energized for proper
operation.

The CO
ID blower when the room CO
Default CO

controller will energize the vent option and the

2

set point is 950 ppm (see Figure 23 on

2

levels rise over set level.

2

page 33).

Climate Control Options B & C are an electronic,
programmable thermostat and (CO

controller on

2

C Model only) with BACnet MS/TP or Ethernet
connections.

The thermostat can be set in the heat, cool or
automatic mode. When the thermostat is set in
the heat mode, it can heat only to maintain the
temperature set on the thermostat. When the
thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
When the thermostat is set in the automatic mode,
the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.

On Option C Models only, the CO

sensor in the

2

controller will energize the vent option and the ID
blower when the room CO
Default CO

set point is 950 ppm.

2

levels rise over set level.

2

NOTE: On Option X, field-provided means to control

ventilation must be used if any of the motorized
ventilation options are installed.

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LOW VOLTAGE CONNECTIONS

“Y” terminal or pin 7 of P2 is the compressor input.

“B” terminal or pin 8 of P2 is the reversing valve input.

The reversing valve must be energized for heating
mode.

“R” terminal or pin 10 of P2 is 24 VAC hot.

“C” terminal or pin 11 of P2 is 24 VAC grounded.

“L” terminal or pin 12 of P2 is compressor lockout

output. This terminal is activated on a high or low
pressure trip by the electronic heat pump control. This
is a 24 VAC output.

“W2” terminal or pin 9 of P2 is second stage heat (if
equipped). If the unit is equipped with an optional
hot water coil plenum box or electric heat these will be
energized by this terminal.

“O1” terminal of pin 5 of P2 is the ventilation input.
This terminal energizes any factory installed ventilation
option.

“E” terminal or pin 3 of P2 is the emergency heat
input. This terminal energizes the emergency heat

relay.

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

of 6 controlled outputs are required (5 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.

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.

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 pins 6 and 1 of P2 are the fan inputs.
Both must be energized for proper fan operation. This
is done automatically in the factory installed climate

Manual 2100-652A
Page 20 of 42

CAUTION

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

TABLE 4

Wall Thermostats and Controls

Thermostat Predominant Features

8403-067 Carbon Dioxide Sensor with LCD for Sensor Readings

3 stage Cool; 3 stage Heat
8403-060
(1120-445)

Programmable/Non-Programmable Electronic

HP or Conventional

Auto or Manual changeover

2 stage Cool; 2 stage Heat
8403-084
(VT8600U5000B)

Programmable/Non-Programmable Electronic

HP or Conventional, Auto or Manual changeover

with BACnet

3 stage Cool; 3 stage Heat

Programmable/Non-Programmable Electronic
CSB9E-THO

HP or Conventional

Auto or Manual changeover with Humidity Control

BACnet MS/TP or Ethernet Connection

3 stage Cool; 3 stage Heat

Programmable/Non-Programmable Electronic

CSB9E-THOC

HP or Conventional

Auto or Manual changeover with CO

Control

and Humidity

2

BACNet MS/TP or Ethernet Connection

FIGURE 16

MIS-1285

Manual 2100-652A
Page 21 of 42

G

Brown/White

Red/White

Yellow

Blue

Brown

Orange

Orange

Bard Part

Black/White

R

Y

O/B B

Red/Yellow

W2

E

C

W3

O1

G

C

W2

5

Y1

RR

Y1

L

O/B

W2

W1/E

C

A

L

CS9BE-THOC

Thermostat

7

REMOTE THERMOSTAT WIRING DIAGRAM

#8403-060

"X" THERMOSTAT OPTION

MIS-2687 B

SC

W1

W1/E

SC

A

SC

8

9

3

CS9BE-THO

1

6

4

Thermostat

Bard Part

#8403-084

Factory installed jumper.

Terminal Block

9

10

6

5

3

11

8

Plug #2

1

12

7

2

4

G

Low Voltage

1

1

1

1

2

FIGURE 17A

Remote Thermostat Wiring Diagram

"X" Thermostat Option

NOTE: On Option X, field-provided means to control

ventilation 01 must be used if any of the
motorized ventilation options are installed.

Manual 2100-652A
Page 22 of 42

Y1

G

A

C

W1/E

W2

O/B

L

R

2

4

5

3

1

Yellow

Bard Part #8403-060

W2

R

9

Relay

Brown/White

4

8 Brown

Red/Yellow

O1

L

Orange

Blue

Red/White

Y

Black/White

3

B

"X" THERMOSTAT OPTION WITH DEMAND VENTILATION

W3

Orange

E

REMOTE THERMOSTAT WIRING DIAGRAM

Part #8201-062

W1

C

Thermostat

5

Factory installed jumper.

3

CO2 Controller

4

2

Terminal Block

Plug #2

10

4

COM

3

11

8

1

Out

Part #8403-067

5

9

Low Voltage

Mount relay in low voltage terminal block compartment.

12

7

2

Relay is field installed and required if demand ventilation

3

2

signal "O1" is supplied.

1

Analog

HOT

24 VAC

3

6

5

2

control does not supply blower "G" signal when ventilation

6

G

1

MIS-2688 C

4

4

Jumper W2 to W3 at terminal block when
using 8403-084 with unit with 15 KW.

7

6

Thermostat

Bard Part #8403-084

FIGURE 17B

Remote Thermostat Wiring Diagram

"X" Thermostat Option with Demand Ventilation

Manual 2100-652A
Page 23 of 42

2

Orange

Red/White

Blue

9

W1/E

10

6

Temp. and Humidity

Controller

PART #8403-060

5

Black/White

G

O/B

3

11

8

4102-060

R

Y1

Plug #2

C

W2

1

Yellow

12

Red/Yellow

Brown

7

Orange

A Brown/White

4

FIGURE 18

Unit Mounted Thermostat Wiring Diagram

"D" Thermostat Option

Manual 2100-652A
Page 24 of 42

3

2

4

51

Orange

Black/White

Orange

Red/White

Blue

9

Analog

Temp. and Humidity

Part #8403-060

5

Black/White

G

O/B

3

11

8

4102-059 A

R

Y1

Plug #2

C

1

Yellow

12

Red/Yellow

Brown

7

A Brown/White

2

Out

24 VAC

Red/White

Brown/White

4

W2

Orange

Red/White

4

CO2 Controller

W1/E

2

1

Red/White

6

51

4

10

Controller

Part #8201-062

COM

Part #8403-067

Relay

2

HOT

6

3

3

Black/White

5

FIGURE 19

Unit Mounted Thermostat Wiring Diagram

"H" Thermostat Option

Manual 2100-652A
Page 25 of 42

FIGURE 20

Unit Mounted Thermostat Wiring Diagram

"B" or "C" Thermostat Option

Temp. and Humidity

Controller

B-CS9BE-THO

C-CS9BE-THOC

W1/E

SC

A

G

SC

Y1

Plug #2

Orange

1

2

Red/Yellow

3

4

Brown/White

5

Orange

6

Yellow

7

Manual 2100-652A
Page 26 of 42

O/B

W2

SC

R

C

Blue

8

Brown

9

Red/White

10

Black/White

11

12

4102-078

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 pressure charts on the inner control panel
cover as a guideline.

REMEMBER: When adding R-410A refrigerant, it
must come out of the charging cylinder/tank as a liquid
to avoid any fractionation, and to insure optimal system
performance. Refer to instructions for the cylinder that
is being utilized for proper method of liquid extraction.

WARNING

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

SAFETY PRACTICES

1. Never mix R-410A with other refrigerants.

2. Use gloves and safety glasses. Polyol Ester oils
can be irritating to the skin, and liquid refrigerant
will freeze the skin.

3. Never use air and R-410A to leak check; the
mixture may become 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 2100-652A
Page 27 of 42

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

PHASE MONITOR

All units with three phase scroll compressors are
equipped with a three 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. Do not reverse any of the unit factory

wires as damage may occur.

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 (Q36H3, Q43H3, Q48H3
AND Q60H3 ONLY)

These units are shipped from the factory set to operate
at the optional CFM level shown in Table 8. 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 service 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 this jumper to
terminal “Y”.

5. Reverse steps to reassemble.

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 1 hour may have a negative
impact on the bearing due to oil pump out.

All three phase scroll compressors used in the Q-TEC
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.

IMPORTANT INSTALLER NOTE

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

Manual 2100-652A
Page 28 of 42

SERVICE HINTS

1. Caution user to maintain clean air filters at all

times and to not 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 again, to reset the high
pressure switch.

3. 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.

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.

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.

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 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 on the following pages.

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 re-installed.

e. Remove wall mounting brackets from wall

on each side of the unit and/or remove the
internal bolts in the lower section securing
unit to wall sleeve.

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

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

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 in pulling unit out from
the wall, it may be desirable to remove the
bottom service door, which requires removal of
the return air panel. Grip the front flange of
the base pan and pull straight out.

Manual 2100-652A
Page 29 of 42

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 21).

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 and removed.

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.

Q-TEC ENERGY RECOVERY VENTILATOR (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 22).

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 is a power
connector for the lower blower assembly. To
disconnect this plug, squeeze the tabs on both
sides of the plug 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 2100-652A
Page 30 of 42

FIGURE 21

Fresh Air Damper Removal

MOUNTING
SCREW

Manual 2100-652A
Page 31 of 42

FIGURE 22

QERV Removal

MOUNTING
SCREWS

POWER

CONNECTORS

LOWER BLOWER

ASSEMBLY

POWER

CONNECTOR

Manual 2100-652A
Page 32 of 42

FRONT FILL

SEQUENCE OF OPERATION

PRESS UP AND DOWN
ARROWS TO ENTER
CONFIGURATION MODE
USE ARROWS TO SELECT
SETTING. PUSH MIDDLE
BUTTON TO CHANGE.
CONTROLLER WILL
SHOW SET.

NOTE: MENU
JUMPER MUST
BE SET TO "ON"
TO CHANGE ANY
SETTINGS WITH
THE FRONT BUTTONS.
TO LOCK THE CO2
CONTROLLER MOVE
JUMPER TO "OFF" AFTER
IT HAS BEEN CONFIGURED

Settings Recommended Default

RON 1000 1000
ROF 950 950
DSP C CT

UNI US US
COL Not Used
COH Not Used

TOL Not Used

TOH Not Used

BAR

See Instrution with Controller

For High Altitude Installations

CAL Used for Field Calibration

MIS-3326

Cooling – Circuit R-Y makes at thermostat, pulling
in compressor contactor and starting the compressor
and outdoor motor. The G (indoor motor) circuit
is automatically completed on any call for cooling
operation or can be energized by manual fan switch on
subbase for constant air circulation.

Heating – A 24V solenoid coil on reversing valve
controls heating cycle operation. Two thermostat
options, one allowing “Auto” changeover from cycle
to cycle and the other constantly energizing solenoid
coil during heating season (thus eliminating pressure
equalization noise except during defrost), are to be
used. On “Auto” option a circuit is completed from
R-W1 and R-Y on each heating “on” cycle, energizing
reversing valve solenoid, pulling in compressor
contactor and 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” changeover position, but instead
energizes the reversing valve solenoid constantly
whenever the system switch on subbase is placed in
“Heat” position (the “B” terminal being constantly
energized from R). A thermostat demand for heat
completes R-Y circuit, pulling in compressor contactor
and starting compressor and outdoor motor. R-G also
makes, starting indoor blower motor.

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 the main power supply off and then
back on, or by resetting 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 low­pressure control during start up in heating mode under
cold weather conditions (see Defrost Control Board –
Figure 24.

FIGURE 23

CO2 Controller (factory set to 950 ppm)

Manual 2100-652A
Page 33 of 42

PRESSURE SERVICE PORTS

High and low pressure service ports are installed on
all units so that the system operating pressures can be
observed. Pressure tables covering all models can be
found on pages 41 and 42. It is imperative to match
the correct pressure table to the unit by model number.
Upper and lower service doors must be attached to
obtain proper reading.

This unit employs high-flow Coremax valves instead of
the typical Shrader type valves.

WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result
in eye injuries or refrigerant burns!

To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.

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" 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.

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 24).

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" QC terminal works best), the defrost sensor
mounted on the outdoor coil is shunted out and 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.

Manual 2100-652A
Page 34 of 42

High Pressure Switch Operation – The control has a

120*

SW1SW

2 TIME (SEC)

OFF
OFF

ON
ON

OFF

ON

OFF

ON

30
60

180

LOW PRESSURE BYPASS TIMER SWITCH
(FACTORY SETTING 120 SECONDS)

ACCUMULATED RUN TIME SELECTOR
(FACTORY SETTING 30 MIN.)

MIS-2684 A

ON

OFF

built-in lockout system that allows the unit to have the
high pressure switch trip up to two times in 1 hour and
only encounter a “soft” lockout. A “soft” lockout shuts
the compressor off and waits for the pressure switch to

Figure 24

Defrost Control Board

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 1 hour, the unit is in “hard” lockout indicating
something is wrong and it will not restart itself.

Manual 2100-652A
Page 35 of 42

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE

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: A thorough understanding of the defrost

cycle sequence is essential. Review that
section earlier in this manual prior to
troubleshooting the control.

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.

1. 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.

BLINK FUNCTION

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

LED BLINK CODES

TABLE 5

Troubleshooting

Sympton Description, Check and Possible Causes What and How to Check/Repair

Compressor
will not start
(heating or
cooling)

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

Reversing
valve does not
energize
(heating only)

Unit will not
go into defrost
(heating only)

Unit will not
come out of
defrost
(heating only)

1. Check for LED illumination.

Is there an LED illuminated on the board (flashing)?

2. Check for error codes.

Is the LED flashing a Code?

3. Check for power at board.

Is there 24 volts AC between R and C?

4. Check codes.

What code is blinking?

5. Compressor delay active.

Wait for 5 minute delay or jump board's "speed up pins".

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

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

8. Check for Compressor input signal.

Is there 24 volts AC between Y and C?

9. No power to board. The unit either does not have unit voltage, the transformer is bad or the unit wiring is incorrect.

10. Check for Compressor output signal.

Is there 24 volts AC between CC & C?

11. No "Y" compressor input signal.

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

13. Faulty board. Replace defrost board.

Heat pump control defective

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

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

Heat pump control defective

Reversing valve solenoid coil defective

Temperature sensor or heat pump control defective

Temperature sensor or heat pump control defective

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

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

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

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

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

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

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

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

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

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

1. Check control circuit wiring.

2. Replace heat pump control.

Check for open or shorted coil.
Replace solenoid coil.

Disconnect temperature sensor from board and jumper across "SPEEDUP" terminals and "SEN
JMP" terminals. This should cause the unit to go through a defrost cycle within one minute.

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

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

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

1. If unit comes out of defrost cycle, replace temperature sensor.

2. If unit does not come out of defrost cycle, replace heat pump control.

Manual 2100-652A
Page 36 of 42

CHECKING TEMPERATURE SENSOR

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

2. Use an ohmmeter to 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%.)

TABLE 6

Temperature(F) Vs. Resistance (R) of Temperature Sensor

F R F R F R F R

-25.0 196871 13.0 56985 53.0 19374 89.0 7507

-24.0 190099 14.0 55284 52.0 18867 90.0 7334

-23.0 183585 15.0 53640 53.0 18375 91.0 7165

-22.0 177318 16.0 52051 54.0 17989 92.0 7000

-21.0 171289 17.0 50514 55.0 17434 93.0 6840

-20.0 165487 18.0 49028 56.0 16984 94.0 6683

-19.0 159904 19.0 47590 57.0 16547 95.0 6531

-18.0 154529 20.0 46200 58.0 16122 96.0 6383

-17.0 149355 21.0 44855 59.0 15710 97.0 6239

-16.0 144374 22.0 43554 60.0 15310 98.0 6098

-15.0 139576 23.0 42295 61.0 14921 99.0 5961

-14.0 134956 24.0 41077 62.0 14544 100.0 5827

-13.0 130506 25.0 39898 63.0 14177 101.0 5697

-12.0 126219 26.0 38757 64.0 13820 102.0 5570

-11.0 122089 27.0 37652 65.0 13474 103.0 5446

-10.0 118108 28.0 36583 66.0 13137 104.0 5326

-9.0 114272 29.0 35548 67.0 12810 105.0 5208

-8.0 110575 30.0 34545 68.0 12492 106.0 5094

-7.0 107010 31.0 33574 69.0 12183 107.0 4982

-6.0 103574 32.0 32634 70.0 11883 108.0 4873

-5.0 100260 33.0 31723 71.0 11591 109.0 4767

-4.0 97064 34.0 30840 72.0 11307 110.0 4663

-3.0 93981 35.0 29986 73.0 11031 111.0 4562

-2.0 91008 36.0 29157 74.0 10762 112.0 4464

-1.0 88139 37.0 28355 75.0 10501 113.0 4367

0.0 85371 38.0 27577 76.0 10247 114.0 4274

1.0 82699 39.0 26823 77.0 10000 115.0 4182

2.0 80121 40.0 26092 78.0 9760 116.0 4093

3.0 77632 41.0 25383 79.0 9526 117.0 4006

4.0 75230 42.0 24696 80.0 9299 118.0 3921

5.0 72910 43.0 24030 81.0 9077 119.0 3838

6.0 70670 44.0 23384 82.0 8862 120.0 3757

7.0 68507 45.0 22758 83.0 8653 121.0 3678

8.0 66418 46.0 22150 84.0 8449 122.0 3601

9.0 64399 47.0 21561 85.0 8250 123.0 3526

10.0 62449 48.0 20989 86.0 8057 124.0 3452

11.0 60565 49.0 20435 87.0 7869

12.0 58745 50.0 19896 88.0 7686

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

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

Manual 2100-652A
Page 37 of 42

TROUBLESHOOTING ECM™ BLOWER MOTORS

CAUTION:

Disconnect power from unit before removing or replacing
connectors, or servicing motor. To avoid electric shock
from the motor’s capacitors, disconnect power and wait at
least 5 minutes before opening motor.

Symptom Cause/Procedure

Motor rocks slightly • This is normal start-up for ECM
when starting

Motor won’t start • Check blower turns by hand

• No movement

• Check low voltage (24 Vac R to C) at motor

• Check low voltage connections
(G, Y, W, R, C) at motor

• Check for unseated pins in connectors on
motor harness

• Test with a temporary jumper between R - G

• Check motor for tight shaft

• Perform motor/control replacement check

• Perform Moisture Check

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

• Perform motor/control replacement check

Motor oscillates up • It is normal for motor to oscillate with no
& down while being load on shaft
tested off of blower

Motor starts, but
runs erratically

• Varies up and down • Check line voltage for variation or “sag”

or intermittent • Check low voltage connections
(G, Y, W, R, C) at motor, unseated pins in
motor harness connectors

• Check “Bk” for erratic CFM command (in

variable-speed applications)

• Check out system controls, thermostat

• Perform Moisture Check

• “Hunts” or “puffs” at • Does removing panel or filter reduce

high CFM (speed) “puffing”?

- Reduce restriction

- Reduce max airflow

• Stays at low CFM • Check low voltage (Thermostat) wires and

despite system call connections
for cool or heat CFM • Verify fan is not in delay mode; wait until
delay complete

• “R” missing/not connected at motor

• Perform motor/control replacement check

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

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

complete

• Perform motor/control replacement check

• Blower won’t shut off • Current leakage from controls into G, Y or

W?
Check for Triac switched thermostat or solid­ state relay

Excessive noise • Determine if it’s air noise, cabinet, duct or
motor noise; interview customer, if
necessary

• Air noise • High static creating high blower speed?

- Is airflow set properly?

- Does removing filter cause blower to slow

down? Check filter

- Use low-pressure drop filter

- Check/correct duct restrictions

• Check power at motor

• Make sure blower wheel is tight on shaft

Symptom Cause/Procedure

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

• High static creating high blower speed?

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

- Check for cabinet/duct deformation

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

- Reduce restriction

- Reduce max. airflow

Evidence of Moisture

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

• Evidence of moisture
present inside air mover

“puffing”?

• Perform Moisture Check

Do Don’t

• Check out motor, controls, • Automatically assume the motor is bad.

wiring and connections
thoroughly before replacing
motor

• Orient connectors down so • Locate connectors above 7 and 4 o’clock

water can’t get in positions

- Install “drip loops”

• Use authorized motor and • Replace one motor or control model # with

model #’s for replacement another (unless an authorized replacement)

• Keep static pressure to a • Use high pressure drop filters; some have ½"

minimum: H20 drop!

- Recommend high • Use restricted returns

efficiency, low static filters

- Recommend keeping filters

clean.

- Design ductwork for min.

static, max. comfort

- Look for and recommend

ductwork improvement,
where necessary

• Size the 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 2100-652A
Page 38 of 42

™

MOTORS CONT’D.

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 26.

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.

Replacing ECM Control Module

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

1. The correct replacement module MUST be used. 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 25. 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 hex­head 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 26. (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 the 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, 7a, 7b or 7c.

7a. 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 through­bolts 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.

7b. 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

SELECTED 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.

7c. 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.

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

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

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

CAUSE IMMEDIATE FAILURE OF THE CONTROL MODULE.

Final installation check. Make sure the motor is installed as

11.
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

27.

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.

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 25 Figure 26

Figure 24

Figure 3

Control Disassembly

Motor Connector

(3-pin)

ECM

2.3/2.5

Push until
Latch Seats
Over Ramp

From Motor

Circuit
Board

Power Connector
(5-pin)

Hex-head Screws

Motor

Motor Connector
(3-pin)

Control Connector
(16-pin)

Back of
Control

Figure 25

Figure 4

Winding Test

Motor OK when

R > 100k ohm

Figure 26

Figure 27

Figure 5

Drip Loop

Connector Orientation

Between 4 and 8 o'clock

Drip Loop

Manual 2100-652A
Page 39 of 42

FAN BLADE SETTING DIMENSIONS

R-410A 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 28

Fan Blade Setting

This unit was charged at the factory with the quantity
of refrigerant listed on the serial plate. AHRI capacity
and efficiency ratings were determined by testing with
this refrigerant charge quantity.

The following pressure tables show nominal
pressures for the units. Since many installation
specific situations can affect the pressure readings,
this information should only be used by certified
technicians as a guide for evaluating proper system
performance. They shall not be used to adjust charge.
If charge is in doubt, reclaim, evacuate and recharge
the unit to the serial plate charge.

TABLE 7

Fan Blade Dimension

MODEL

All
Q**H3
Models

DIMENSION A

(INCHES)

.750

TABLE 8

Indoor Blower Performance

Model

Q24H3 

Q30H3 .15 0.8 1000 N/A 1000 910

Q36H3 .15 0.8 1200 1000 1000 1175

Q43H3 .15 0.8 1200 1000 1000 1175

Q48H3 .15 0.8 1400 1100 1100 1175

Q60H3 .20 0.5 1550 1250 1100 1400

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

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.

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

 Rated CFM for ducted applications – required for maximum performance rating. To obtain full CFM on models Q36H2, Q42H2,

Q48H2 and Q60H2, connect the pink jumper wire (provided) to terminal #G2 and #Y on the low voltage terminal block located in
the circuit breaker box.

 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.

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

 Model Q24H3 – when operating on 2nd stage heating the indoor air will increase to 1000 CFM.

Rated

ESP

.10 0.5 800 N/A 800 700



Max. ESP



Rated CFM



Optional

CFM



Continuous

CFM

CFM @

Max. ESP

Manual 2100-652A
Page 40 of 42

TABLE 9

Cooling Pressure

(All Temperatures in Degrees F)

MODEL

Q24H3

Q30H3

Q36H3

Q43H3

Q48H3

Q60H3

RETURN

AIR

TEMP.

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

75 DB

62 WB

80 DB

67 WB

85 DB

72 WB

PRESSURE

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

 AIR TEMPERATURE ENTERING OUTDOOR COIL

75° 80° 85° 90° 95° 100° 105° 110° 115° 120°

118
326

126
334

130
346

123
325

132
333

137
345

127
343

136
352

141
364

124
333

133
342

138
354

120
337

128
346

132
358

115
336

123
345

127
357

119
340

127
349

131
361

125
347

134
256

139
368

129
363

138
372

143
385

127
353

136
362

141
375

122
362

130
371

135
384

117
357

125
366

129
379

121
358

129
367

134
380

127
370

136
379

141
392

131
383

140
393

145
407

130
374

139
384

144
397

123
385

132
395

137
409

119
378

127
388

131
402

122
377

131
387

136
401

128
393

137
403

142
417

133
406

142
416

147
431

133
397

142
407

147
421

125
410

134
421

139
436

121
402

129
412

134
426

125
399

134
409

139
423

130
418

139
429

144
444

135
429

144
440

149
455

135
420

144
431

149
446

128
436

137
447

142
463

122
427

131
438

136
453

128
422

137
433

142
448

133
444

142
455

147
471

137
453

146
465

151
481

137
446

146
457

151
473

130
461

139
473

144
490

124
453

133
465

138
481

132
449

141
460

146
476

135
470

144
482

149
499

138
480

148
492

153
509

138
471

148
483

153
500

132
488

141
500

146
518

126
482

135
494

140
511

135
477

144
489

149
506

137
496

146
509

151
527

140
507

150
520

155
538

139
498

149
511

154
529

134
515

143
528

148
546

128
511

137
524

142
542

138
508

148
521

153
539

139
525

149
538

154
557

142
536

152
550

157
569

140
527

150
541

155
560

137
542

146
556

151
575

130
542

139
556

144
575

140
525

152
559

157
578

141
554

151
568

156
588

145
566

155
581

160
601

141
557

151
571

156
591

138
570

148
585

153
605

133
574

142
589

147
610

Low side pressure ± 4 psig
High side pressure ± 10 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.

Manual 2100-652A
Page 41 of 42

TABLE 10

Heating Pressure

(All Temperatures in Degrees F)

RETURN

MODEL

Q24H3 70

Q30H3 70

Q36H3 70

Q43H3 70

Q48H3 70

Q60H3 70

Low side pressure ± 4 psig
High side pressure ± 10 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.

AIR

TEMP.

PRESSURE

Low Side

High Side352844229049297573046431372322793318634294353

Low Side

High Side28279382844728955296633037131178320853299133997350

Low Side

High Side34275412764727854281612856828974295813038831195320

Low Side

High Side22256332644327252281612896929878307853179232799337

Low Side

High Side

Low Side

High Side3825340262422714628050288562976230569313783218732997337

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

171

123

241

2548526656278362892630025310343205232980338

 AIR TEMPERATURE ENTERING OUTDOOR COIL

101
365

109
378

103
362

101
330

106
347

117
346

117
392

108
375

108
341

112
358

163
354

109
344

124
406

112
388

115
353

117
369

219
362

121
352

Manual 2100-652A
Page 42 of 42