Bard Q24H2DB, Q24H2DC, Q30H2DB, Q30H2DA, Q30H2DC Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Q-TECTM SERIES

PACKAGED HEAT PUMP

Models:

Q24H2DA
Q24H2DB
Q24H2DC

Q30H2DA
Q30H2DB
Q30H2DC

Q36H2DA
Q36H2DB
Q36H2DC

Q42H2DA
Q42H2DB
Q42H2DC

Q48H2DA
Q48H2DB
Q48H2DC

Q60H2DA
Q60H2DB
Q60H2DC

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

www.bardhvac.com

Manual No.: 2100-603B
Supersedes: 2100-603A
Date: 8-3-16

Page 1 of 44

CONTENTS

Getting Other Information and Publications

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

Q-TEC General Information

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 Kit ........................................... 11

Installation

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

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

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

Optional Climate Controls Seq. of Op. .............19 & 20

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

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

Start Up

R-410A Refrgerant ................................................. 27

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

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

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

Optional CFM
(

Q36H2D, Q42H2D, Q48H2D & Q60H2D Only

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

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

Three Phase Scroll Compressor Start Up Information . 28

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

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

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

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

Refrigerant Tube Schematic for Reheat Coil .............. 34

Pressure Service Ports ............................................ 35

Defrost Cycle ......................................................... 36

Troubleshooting

Troubleshooting Solid State HP Control ....................38

Checking Temperature Sensor ..................................39

Troubleshooting ECM™ Blower Motors ................40-41

Fan Blade Setting Dimensions ................................. 42

Refrigerant Charge .................................................. 42

Pressure Charts .............................................. 43 & 44

) ............ 28

Figures

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

Figure 2 Air Seal Under 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
Figure 12B
Figure 12C
Figure 12D
Figure 13A

Figure 13B

Figure 14 Removing Locking Screws from Wheels ..... 18

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

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

Figure 17 Thermostat Wiring Diagram "X" Option ...... 22

Figure 18

Figure 19 Thermostat Wiring Diagram "E" Option ..... 24

Figure 20 T-Stat Wiring Diagram "I" Option .............. 25

Figure 21 T-Stat Wiring Diagram "J or K" Opt. ......... 26

Figure 22 Fresh Air Damper Removal ....................... 31

Figure 23 QERV Removal ........................................ 32

Figure 24 CO

Optional Rear Drain Kit............................ 13

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

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

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

Unit Mounting ........................................ 17

Unit Mounting ........................................ 17

T-Stat Diagram "X" Opt. & Demand Vent. .......

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

2

23

Figure 25 A/C Mode Circuit Diagram ........................ 34

Figure 26 Dehum. Mode Circuit Diagram .................. 35

Figure 27 Defrost Control Board .............................. 37

Figure 28 Control Disassembly ................................ 41

Figure 29 Winding Test ........................................... 41

Figure 30 Drip Loop ............................................... 41

Figure 31 Fan Blade Setting ................................... 42

Tables

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

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

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

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

Table 5 Troubleshooting ........................................ 38

Table 6 Temp. vs Resistance of Temp. Sensor ......... 39

Table 7 Fan Blade Dimensions .............................. 42

Table 8 Subcooling @ Liquid Line ......................... 42

Table 9 Indoor Blower Performance ....................... 42

Table 10 Cooling Pressure ...................................... 43

Table 11 Heating Pressure ...................................... 44

Table 12 Dehum. Relay Logic Board ........................ 44

Manual 2100-603B
Page 2 of 44

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 2100-603B
Page 3 of 44

Q-TEC Series General Information

Q-TEC MODEL NOMENCLATURE

Q 36 H 2 D A 10 X X X X X X

MODEL
NUMBER

Q-TEC™

CAPACITY

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

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/Independent Intake & Exhaust Control

HEAT

PUMP

REVISION

DEHUMIDIFICATION
REHEAT CYCLE

VOLTS & PHASE

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

KW

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

FILTER OPTIONS

X - 1 inch Fiberglass
(Standard)
F - 2 inch Fiberglass
P - 2 inch Pleated

COLOR

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

CLIMATE CONTROL OPTIONS

X - None 
E - Electronic/Prog/Man/Auto/Humidistat
I - Electronic/Prog/Man/Auto with CO
J - CS9BE-THO (BACnet IP or Ethernet)
K - CS9BE-THOC with CO

COIL OPTIONS

X - Standard
1 - Phenolic coated

evaporator*
2 -

Phenolic coated

condenser
3 - Phenolic coated

evaporator and
condenser coil*

*and reheat if
applicable

2

(BACnet IP or Ethernet)

2

INTERNAL
CONTROLS

X - Standard

• High Pressure Switch

• Low Pressure Switch

• Compressor Control
Module w/Time Delay
E - Low Ambient Control
Q - Outdoor Thermostat
R - Low Ambient Control

& Outdoor Thermostat

NOTE:  If “X” control option is selected, then thermostat and humidistat, if applicable, or DDC control system must be field supplied.

TABLE 1

FACTORY BUILT-IN ELECTRIC HEAT TABLE

(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 2100-603B
Page 4 of 44

TABLE 2 – ELECTRICAL SPECIFICATIONS

No.

Field

Power

Circuits

1

1

3

1

3

1

3

1

3

1

3

1

3

1

1 or 2

1
1
1

1
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

1

1



Minimum

Circuit

Ampacity

22
47
72

17
35
44

10
19
23

25
50
75

18
37
45
55

12
21
25
30

31
56
81
83

25
43
52
53

12
21
26
27

34
59
84
84

25
43
52
53

13
22
26
27

38
63
88
88

29
47
56
56

15
24
28
28

45
70
95
95

31
58
58

17
31
31

MODEL

Q24H2DA0Z

A05
A10

Q24H2DB0Z

B06
B09

Q24H2DC0Z

C06
C09

Q30H2DA0Z

A05
A10

Q30H2DB0Z

B06
B09
B12

Q30H2DC0Z

C06
C09
C12

Q36H2DA0Z

A05
A10

 A15

Q36H2DB0Z

B06
B09

 B15

Q36H2DC0Z

C06
C09

 C15

Q42H2DA0Z

A05
A10

 A15

Q42H2DB0Z

B06
B09

 B15

Q42H2DC0Z

C06
C09

 C15

Q48H2DA0Z

A05
A10

 A15

Q48H2DB0Z

B06
B09

 B15

Q48H2DC0Z

C06
C09

 C15

Q60H2DA0Z

A05
A10

 A15

Q60H2DB0Z

B09

 B15

Q60H2DC0Z

C09

 C15

Rated

Volts &

Phase

230/208-

230/208-

460-3

230/208-

230/208-

460-3

230/208-

230/208-

460-3

230/208-

230/208-

460-3

230/208-

230/208-

460-3

230/208-

230/208-

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 heating only.

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

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

Single Circuit Dual Circuit



Maximum

External

Fuse or Ckt.

Brkr.

30
50
80

20
35
45

15
20
25

35
50
80

25
40
45
60

15
25
25
30

45
60
90
90

30
50
60
60

15
25
30
30

50
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
10

8
6
4
4

10

8
6
6

14
10
10
10

8
6
4
4

8
8
6
6

14
10
10
10

8
6
3
3

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 25 50 30 50 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

31335050454550

34345050454550

38
38
38

45
45
45

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

Manual 2100-603B
Page 5 of 44

10

10

10
10
10

10
10
10

FIGURE 1

Q24H2D

UNIT DIMENSIONS

Q30H2D

Q36H2D

Q42H2D

Q48H2D

Q60H2D

Manual 2100-603B
Page 6 of 44

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.

FIGURE 3

REMOVAL OF UNIT FROM 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.

Hold Skid
Down

A Shipping Brackets B Front Wheels Over Edge

C Front Wheels On Floor

Manual 2100-603B
Page 7 of 44

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 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.

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.

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 by 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.

FIGURE 4

UNIT ON APPLIANCE CART

Q-TEC UNIT

(Right Side)

STRAP

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.

APPLIANCE
CART

COMPRESSOR

Manual 2100-603B
Page 8 of 44

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.

FIGURE 5

INSTALLATION WITH DUCT FREE PLENUM

FIGURE 6

DUCTED APPLICATION

Manual 2100-603B
Page 9 of 44

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 Q-TEC 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
one torx screw 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
Q-TEC UNIT

DUCT FLANGE
PROVIDED WITH
UNIT

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.

FILTERS

RETURN AIR
GRILLE

FIGURE 8

FILTER LOCATION

Manual 2100-603B
Page 10 of 44

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, 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.

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.

For details on energy recovery ventilation see separate
section.

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.

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.

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.

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
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.
NOTE: Additional circuit needed for drain heater.

Manual 2100-603B
Page 11 of 44

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 2100-603B
Page 12 of 44

MIS-2469

DRAIN BOX

WALL SLEEVE

OVERFLOW TUBE

CAULK AROUND TUBE

FIGURE 12A

Manual 2100-603B
Page 13 of 44

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 2100-603B
Page 14 of 44

IMPORTANT!