Bard Q-TEC Q24H3DA User manual

Page 1 of 44
INSTALLATION INSTRUCTIONS
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual No.: 2100-653
Supersedes: NEW
Date: 9-22-16
Q-TECTM SERIES
PACKAGED HEAT PUMP
Models:
Q24H3DA
Q24H3DB
Q24H3DC
Q30H3DA
Q30H3DB
Q30H3DC
Q36H3DA
Q36H3DB
Q36H3DC
Q42H3DA
Q42H3DB
Q42H3DC
Q48H3DA
Q48H3DB
Q48H3DC
Q60H3DA
Q60H3DB
Q60H3DC

Manual 2100-653
Page 2 of 44
CONTENTS
Figures
Figure 1 Unit Dimensions ....................................... 6
Figure 2 Air Seal Under Q-TEC Unit......................... 7
Figure 3 Removal of Unit from Skid......................... 7
Figure 4 Unit on Appliance Cart .............................. 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 (Side View)................ 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 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
T-Stat Diagram "X" Opt. & Demand Vent. ....... 23
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 CO2Controller......................................... 33
Figure 25 Q-TEC Dehum. Mode Circuit Diagram........ 34
Figure 26 Q-TEC Cooling 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 ...................... 4
Table 2 Electrical Specifications.............................. 5
Table 3 Operating Voltage Range ........................... 19
Table 4 Wall Thermostats and Controls................... 21
Table 5 Troubleshooting........................................ 38
Table 6 Temp. vs Resistance of Temp. Sensor......... 39
Table 7 Fan Blade Dimensions .............................. 42
Table 8 Subcooling at 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
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 ................................................................. 21
Start Up ........................................................................ 27
R-410A Refrigerant: General ................................... 27
Topping Off System Charge ..................................... 27
Safety Practices ..................................................... 27
Description of Standard Equipment.......................... 28
Optional CFM (
Q36H3D, Q43H3D, Q48H3D
and Q60H3D Only )................................................... 28
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 ......................................................... 38
Solid State Heat Pump Control ................................ 38
Checking Temperature Sensor.................................. 39
Troubleshooting ECM™ Blower Motors ..................... 40
Fan Blade Setting Dimensions ................................. 42
R-410A Refrigerant Charge ..................................... 42

Manual 2100-653
Page 3 of 44
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 2100-653
Page 4 of 44
TABLE 1
Factory Built-In Electric Heat
(See Table 2 for Available Electric Heat by Unit Model)
Nominal
KW
At 240V At 208V At 480V At 460V 
KW 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
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.
Q-TEC Series General Information
Q-TEC MODEL NOMENCLATURE
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 
FILTER OPTIONS
X - 1" Fiberglass
(Standard)
F - 2" Fiberglass
P - 2" Pleated
Q36 H 3 DA 10 X X X X X X
CAPACITY
24 - 2 Ton
30 - 2½ Ton
36 - 3 Ton
43 - 3½ Ton
48 - 4 Ton
60 - 5 Ton
KW
0Z - 0KW
05 - 5KW
06 - 6KW
09 - 9KW
10 -10KW
12 -12KW
15 -15KW
COIL OPTIONS
X - Standard
1 -Phenolic coated
evaporator*
2 - Phenolic coated
condenser
3 -Phenolic coated
evaporator &
condenser coil*
*and reheat if
applicable
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
REVISION
VOLTS & PHASE
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
CLIMATE CONTROL OPTIONS
X - None 
E - Electronic/Prog/Humidistat 
I - Electronic/Prog/Humidistat/CO2 
J - CS9BE-THO (BACnet IP or Ethernet)
K - CS9BE-THOC w/CO2(BACnet IP or Ethernet)
COLOR
V - Platinum w/Slate
Front (Vinyl)
X - Beige paint
4 - Gray paint
DEHUMIDIFICATION
REHEAT CYCLE
HEAT
PUMP
MODEL
NUMBER
NOTE: If “X” control option is selected, thermostat and humidistat, if applicable, or DDC control system must be field supplied.
8403-060 Thermostat
8403-060 Thermostat & 8403-067 CO2Controller
Not available with "X" control option, and for all other climate control options is a single sensor that functions with unit-mounted
thermostat.

Manual 2100-653
Page 5 of 44
MODEL Rated Volts
& Phase
No.
Field
Power
Circuits
Single Circuit Dual Circuit

Minimum
Circuit
Ampacity

Maximum
External
Fuse or Ckt.
Brkr.

Field
Power
Wire Size

Ground
Wire
Minimum
Circuit
Ampacity
Maximum
External Fuse or
Ckt. Breaker

Field Power
Wire Size

Ground
Wire Size
Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B Ckt. A Ckt. B
Q24H3DA0Z
A05
A10
230/208-1
1
1
1 or 2
22
47
72
30
50
80
10
8
4
10
10
8 22 50 30 50 10 8 10 10
Q24H3DB0Z
B06
B09
230/208-3
1
1
1
17
35
44
20
35
45
12
8
8
12
10
10
Q24H3DC0Z
C06
C09
460-3
1
1
1
10
19
23
15
20
25
14
12
10
14
12
10
Q30H3DA0Z
A05
A10
230/208-1
1
1
1 or 2
27
52
77
35
60
80
8
6
4
10
10
8 27 50 30 50 10 8 10 10
Q30H3DB0Z
B06
B09
B12
230/208-3
1
1
1
1
19
38
47
56
25
40
50
60
10
8
8
6
10
10
10
10
Q30H3DC0Z
C06
C09
C12
460-3
1
1
1
1
13
22
26
31
15
25
30
35
14
10
10
8
14
10
10
10
Q36H3DA0Z
A05
A10
A15
230/208-1
1
1
1 or 2
1 or 2
29
55
79
82
40
60
80
90
8
6
4
4
10
10
8
8
29
32
50
50
45
45
50
50
8
8
8
8
10
10
10
10
Q36H3DB0Z
B06
B09
B15
230/208-3
1
1
1
1
21
39
48
52
30
45
50
60
10
8
8
6
10
10
10
10
Q36H3DC0Z
C06
C09
C15
460-3
1
1
1
1
13
22
27
27
15
25
30
30
14
10
10
10
14
10
10
10
Q43H3DA0Z
A05
A10
A15
230/208-1
1
1
1 or 2
1 or 2
31
57
81
81
45
60
90
90
8
6
4
4
10
10
8
8
31
33
50
50
45
45
50
50
8
8
8
8
10
10
10
10
Q43H3DB0Z
B06
B09
B15
230/208-3
1
1
1
1
26
44
53
53
35
50
60
60
8
8
6
6
10
10
10
10
Q43H3DC0Z
C06
C09
C15
460-3
1
1
1
1
13
22
27
27
15
25
30
30
14
10
10
10
14
10
10
10
Q48H3DA0Z
A05
A10
A15
230/208-1
1
1 or 2
1 or 2
1 or 2
37
62
87
87
50
70
90
90
8
6
3
3
10
8
8
8
37
37
37
25
50
50
50
50
50
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
Q48H3DB0Z
B06
B09
B15
230/208-3
1
1
1
1
28
47
56
56
40
50
60
60
8
8
6
6
10
10
10
10
Q48H3DC0Z
C06
C09
C15
460-3
1
1
1
1
16
25
29
29
20
25
30
30
12
10
10
10
12
10
10
10
Q60H3DA0Z
A05
A10
A15
230/208-1
1
1 or 2
1 or 2
1 or 2
42
67
92
92
60
80
100
100
8
4
3
3
10
8
8
8
42
42
42
25
50
50
60
60
60
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
Q60H3DB0Z
B09
B15
230/208-3
1
1
1
32
59
59
45
60
60
8
6
6
10
10
10
Q60H3DC0Z
C09
C15
460-3
1
1
1
16
31
31
20
35
35
12
8
8
12
10
10
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.
TABLE 2 – Electrical Specifications

Manual 2100-653
Page 6 of 44
FIGURE 1
Unit Dimensions

Manual 2100-653
Page 7 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
FIGURE 3
Removal of Unit from Skid
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-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.
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
Hold skid
down
AShipping brackets BFront wheels over edge CFront wheels on floor

Manual 2100-653
Page 8 of 44
HANDLING UNIT AFTER REMOVAL
FROM SKID
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
(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 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.
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' 4½". This provides enough clearance
to install the duct work (see Figure 6).
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.
FIGURE 4
Unit on Appliance Cart
Q-TEC Unit
(Right Side)
Appliance
Cart
Strap
Compressor

Manual 2100-653
Page 9 of 44
FIGURE 6
Ducted Application
FIGURE 5
Installation with Duct Free Plenum

Manual 2100-653
Page 10 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" 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.
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.
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" throw away filters [(1) 16x16 and (1) 16x20]
are supplied with each unit. The filters slide into filter
brackets (see 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" filters. The tabs for the 1" filters
must be bent down to allow the 2" filters to slide in
place.
NOTE: Unit cabinet, supply air duct and duct free
plenum are approved for “0” clearance to
combustible material.
FIGURE 7
Supply Duct Connections
Supply duct
(field supplied)
Attachment
screws (field
supplied)
Room side of
Q-TEC unit
Duct flange provided
with unit
FIGURE 8
Filter Location
Return Air Grille
Filters

Manual 2100-653
Page 11 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, 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.
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.
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.
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
An optional rear drain kit, Bard Model QCDS48A, is
also available for these products. The optional rear
drain kit offers multiple benefits that include the
following:
• Allows unit to be rolled away from the sleeve
without having to disconnect any hard plumbing
connections.
• Allows indoor coil condensate to be easily
connected to rear drain box while bypassing the
outdoor coil drain pan. This aids in minimizing
the potential for biological growth to occur by
minimizing the standing water and exposing it to
warm temperatures.
See Figures 12A, 12B, 12C and 12D.
The drain box permanently mounts onto the wall sleeve
and is then either piped directly outdoors, or can be
piped vertically. The Q-TEC unit is then equipped with
fittings on the rear of the unit that slide into the drain
box as it is wheeled towards the wall sleeve.
NOTE: 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 2100-653
Page 12 of 44
Water
Trap
FIGURE 11
Rear Drain (Top View)
Wall (maximum
10" for rear drain)
Couplings not
shown but
recommended
for ease of
removability for
service
Sleeve
Drain Line
Wall
Bracket
Unit
FIGURE 10
Standard Rear Drain
FIGURE 9
Optional Side Drain (Side View)
Q-TEC UNIT

Manual 2100-653
Page 13 of 44
MIS-2469
DRAINBOX
WALL SLEEVE
OVERFLOW TUBE
CAULK AROUND TUBE
FIGURE 12A

Manual 2100-653
Page 14 of 44
SUPPLIED WITH DRAINBOX 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 DRAINBOX KIT
PLUG INSTALLED IN
SIDE Q/Tec DRAIN
MIS-2470
FIGURE 12B
IMPORTANT!

Manual 2100-653
Page 15 of 44
REMOVE KNOCK-OUT FOR
INDOOR DRAIN HOSE CONNECTOR
MIS-2471
FIGURE 12C
(If Used)

Manual 2100-653
Page 16 of 44
MIS-2472
DRAIN HOSE FROM INDOOR
DRAINPAN.
MOVE HOSE FROM ATTACHMENT IN
LOWER DRAINPANAND SLIDE ONTO
DRAINBOX BARB FITTING, SECURING
WITH SUPPLIED CLAMP IF OUTDOOR
PANIS BYPASSED. ( WILL REDUCE RISK
OF ALGAE GROWTH IN THE OUTDOOR
PANBUT ATA SLIGHT COOLING
PERFORMANCE REDUCTION OF 2-3% )
FIGURE 12D

Manual 2100-653
Page 17 of 44
Washer
Sleeve Stud
MIS-2689
Nut
Lower Control Panel
Condenser
Door (Removed)
Return Grille
FIGURE 13A
Unit Mounting – Method 1
Bottom Trim
Piece Bottom Trim
Extension
Mounting
Bracket
Side Trim
(2 PCS.)
Side Trim
(2 PCS.)
Cabinet Side
Panel
Enlarged view of mounting bracket showing
sleeve to cabinet attachment
Mounting Bracket
#8 Screw
Provided
(Light Color)
Wall
Sleeve
#10 Hex
Head Screw
Provided
FIGURE 13B
Unit Mounting – Method 2

Manual 2100-653
Page 18 of 44
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 required to connect the side drain.
If the 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 the
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 the 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" to
10.5", a side trim extension
piece kit, model QSTX42, is available.
Remove screws from wheels
before rolling into place
FIGURE 14
Removing Locking Screws from Wheels

Manual 2100-653
Page 19 of 44
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
The standard climate control Option X is a remote
thermostat connection terminal block. See Figure
17 or Figure 18 for wiring diagram. Compatible
thermostats are listed in Table 4.
Climate control Option E is an electronic,
programmable thermostat with humidistat. The
subbase of the thermostat is factory wired to the front
panel of the unit. See Figure 19 for wiring diagram.
Compatible for use with energy recovery ventilator.
This unit has a refrigerant reheat circuit that is
controlled by a 3 way valve.
When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced.
The 3 way valve directs hot discharge gas into a
separate desuperheating condenser circuit that reheats
the conditioned air before it is delivered to the room.
When the humidistat is satisfied, the system switches
back to normal air conditioning mode.
If the thermostat calls for cooling during
dehumidification mode, the call for cooling takes
precedence over the dehumidification and the unit will
cool until the thermostat is satisfied. Once the call for
cooling is satisfied, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in
the dehumidification mode, the electric heaters will
energize and the evaporator airflow will return to the
heating airflow. When the thermostat is satisfied,
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
TABLE 3
Operating Voltage Range
NOTE: The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
The field wiring connections are located behind the
top and hinged panel in the circuit breaker panel (see
Figure 15).
WIRING – LOW VOLTAGE
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.
TAP RANGE
240V 253 – 216
208V 220 – 197
Dehumidification
Control
Unit
Mounted
Thermostat
Location
Electric
Heaters
Circuit Breaker
Panel and
Controls
Indoor
Blower
Side Field
Wire Entrance
Lower
Control
Panel
Remote
Thermostat
Terminal
Block

Manual 2100-653
Page 20 of 44
the electric heaters will turn off and the airflow will be
reduced and the system will continue to dehumidify until
humidistat is satisfied.
If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.
Climate control Option I is an electronic, programmable
thermostat with humidistat and a CO
2
controller. The
subbase of the thermostat and CO
2
controller are factory
wired to the front panel of the unit. See Figure 20 for
wiring diagram. This unit has a refrigerant reheat circuit
that is controlled by a 3 way valve.
When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced. The
3 way valve directs hot discharge gas into a separate
desuperheating condenser circuit that reheats the
conditioned air before it is delivered to the room. When
the humidistat is satisfied, the system switches back to
normal air conditioning mode.
If the thermostat calls for cooling during dehumidification
mode, the call for cooling takes precedence over the
dehumidification and the unit will cool until the thermostat
is satisfied. Once the call for cooling is satisfied, the unit
may continue to dehumidify.
If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will energize and
the evaporator airflow will return to the heating airflow. When
the thermostat is satisfied, the electric heaters will turn off
and the airflow will be reduced and the system will continue
to dehumidify until humidistat is satisfied.
If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.
The CO2controller will energize the vent option and the
ID blower when the room CO2levels rise over set level.
Default CO2setpoint is 950 ppm. See Figure 24.
Climate control Options J & K are an electronic,
programmable thermostat, humidistat and CO2controller
"J" model only) with BACnet, MS/TP or Ethernet
connections.
When the humidity is above the setpoint of the humidistat,
the compressor circuit and the 3-way valve are energized
and the evaporator airflow is reduced. The 3-way valve
directs hot discharge gas into a separate desuperheating
condenser circuit that reheats the conditioned air before it is
delivered to the room. When the humidistat is satisfied, the
system switches back to normal air conditioning mode.
If the thermostat calls for cooling during dehumidification
mode, the call for cooling takes precedence over the
dehumidification and the unit will cool until the thermostat
is satisfied. Once the call for cooling is satisfied, the unit
may continue to dehumidify.
If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will energize
and the evaporator airflow will return to the heating airflow.
When the thermostat is satisfied, the electric heaters will
turn off and the airflow will be reduced and the system will
continue to dehumidify until humidistat is satisfied.
If the unit is running in heat pump mode and the
humidstat calls for dehumidification, the dehumidification
mode takes precedence over the heat pump heating mode.
The unit will not return to the heating mode until 2nd
stage heating is called for.
On Option J Models only, the CO2sensor in the controller
will energize the vent option and the ID blower when the
room CO2levels rise over set level. Default CO2setpoint is
950 ppm.
NOTE: On Option X, field-provided means to control
ventilation must be used if any of the motorized
ventilation options are installed.
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage circuit.
The “R” terminal is the hot terminal and the “C” terminal
is grounded.
“G” terminal or pin 6 of P2 is the fan input. If the climate
control option is abandoned and connections are made
directly to P2 pin 6 of P2 must be energized for proper
operation.
“Y1” terminal or pin 7 of P2 is the compressor input.
“W1” terminal or pin 8 of P2 is the fist stage heat.
“R” terminal or pin 10 of P2 is 24 VAC hot.
“C” terminal or pin 11 of P2 is 24 VAC grounded.
Terminal “1” or pin 4 of P2 is the dehumidification circuit.
Terminal “2” or pin 12 of P2 is the dehumidification
circuit. A contact must connect terminals 1 and 2.
“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.
LOW VOLTAGE CONNECTIONS
FOR DDC CONTROL
Fan Only Energize G
Cooling Mode Energize Y, G
Heat Pump Heating Energize Y, G, B
2nd State Heating Energize G, W2, Y, B
(if employed)
Ventilation Energize G, O1
Dehumidication Energize 4
Emergency Heat Energize B, W2, E, G