Bard Q-TEC Q24H2D Series User manual

Manual 2100-602
Page 1 of 44
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914 . . . Moving ahead, just as planned.
Manual: 2100-603
Supersedes: NEW
File: Vol II Tab 14
Date: 11-05-13
Models:
Q24H2D Q30H2D
Q36H2D Q42H2D
Q48H2D Q60H2D
Q-TEC SERIES
PACKAGED
AIR CONDITIONER
INSTALLATION
INSTRUCTIONS

Manual 2100-602
Page 2 of 44
CONTENTS
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 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.............................................17
Figure 13B Unit Mounting.............................................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 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 Specications.................................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
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 Instructions
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 ).. 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 Cycel..................................................................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

Manual 2100-603
Page 3 of 44
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help you install the air
conditioner or heat pump. You can usually nd these
at your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.
National Electrical Code...................... ANSI/NFPA 70
Standard for the Installation...............ANSI/NFPA 90A
of Air Conditioning and Ventilating Systems
Standard for Warm Air.......................ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for ..................... ACCA Manual J or
Winter and Summer Manual N
Air Conditioning
Low Pressure, Low Velocity.........ACCA Manual D or
Duct System Design Manual Q
Winter and SummerAir Conditioning
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA Air Conditioning Contractors ofAmerica
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 AmericanSocietyofHeating,Refrigeration,
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA National Fire ProtectionAssociation
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

Manual 2100-603
Page 4 of 44
TABLE 1
FACTORY BUILT-IN ELECTRIC HEAT TABLE
(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 inch Fiberglass
(Standard)
F - 2 inch Fiberglass
P - 2 inch Pleated
Q 36 H 2 DA 10 X X X X X X
CAPACITY
24 - 2 Ton
30 - 2½ Ton
36 - 3 Ton
42 - 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 and
condenser coil*
*and reheat if
applicable
VENTILATION OPTIONS
X - Barometric FreshAir 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/Man/Auto/Humidistat
I- Electronic/Prog/Man/Auto with CO2
J - CS9BE-THO (BACnet IP or Ethernet)
K - CS9BE-THOC with 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
Q-TEC™
NOTE:  If “X” control option is selected, then thermostat and humidistat, if applicable, or DDC control system must be eld supplied.

Manual 2100-603
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
Q24H2DA0Z
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
Q24H2DB0Z
B06
B09 230/208-3 1
1
1
17
35
44
20
35
45
12
8
8
12
10
10
Q24H2DC0Z
C06
C09 460-3 1
1
1
10
19
23
15
20
25
14
12
10
14
12
10
Q30H2DA0Z
A05
A10 230/208-1 1
1
1 or 2
25
50
75
35
50
80
8
8
4
10
10
8 25 50 30 50 10 8 10 10
Q30H2DB0Z
B06
B09
B12
230/208-3
1
1
1
1
18
37
45
55
25
40
45
60
10
8
8
6
10
10
10
10
Q30H2DC0Z
C06
C09
C12
460-3
1
1
1
1
12
21
25
30
15
25
25
30
14
10
10
10
14
10
10
10
Q36H2DA0Z
A05
A10
A15
230/208-1
1
1
1 or 2
1 or 2
31
56
81
83
45
60
90
90
8
6
4
4
10
10
8
831 33 50 50 45 45 50 50 8 88 810 10 10 10
Q36H2DB0Z
B06
B09
B15
230/208-3
1
1
1
1
25
43
52
53
30
50
60
60
10
8
6
6
10
10
10
10
Q36H2DC0Z
C06
C09
C15
460-3
1
1
1
1
12
21
26
27
15
25
30
30
14
10
10
10
14
10
10
10
Q42H2DA0Z
A05
A10
A15
230/208-1
1
1
1 or 2
1 or 2
34
59
84
84
50
60
90
90
8
6
4
4
10
10
8
834 34 50 50 45 45 50 50 8 88 810 10 10 10
Q42H2DB0Z
B06
B09
B15
230/208-3
1
1
1
1
25
43
52
53
35
50
60
60
8
8
6
6
10
10
10
10
Q42H2DC0Z
C06
C09
C15
460-3
1
1
1
1
13
22
26
27
15
25
30
30
14
10
10
10
14
10
10
10
Q48H2DA0Z
A05
A10
A15
230/208-1
1
1 or 2
1 or 2
1 or 2
38
63
88
88
50
70
90
90
8
6
3
3
10
8
8
8
38
38
38
25
50
50
50
50
50
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
Q48H2DB0Z
B06
B09
B15
230/208-3
1
1
1
1
29
47
56
56
40
50
60
60
8
8
6
6
10
10
10
10
Q48H2DC0Z
C06
C09
C15
460-3
1
1
1
1
15
24
28
28
20
25
30
30
12
10
10
10
12
10
10
10
Q60H2DA0Z
A05
A10
A15
230/208-1
1
1 or 2
1 or 2
1 or 2
45
70
95
95
60
90
100
100
8
4
3
3
10
8
8
8
45
45
45
25
50
50
60
60
60
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
Q60H2DB0Z
B09
B15 230/208-3 1
1
1
31
58
58
45
60
60
8
6
6
10
10
10
Q60H2DC0Z
C09
C15 460-3 1
1
1
17
31
31
25
35
35
10
8
8
10
10
10
 Maximum size of the time delay fuse or HACR type circuit breaker for protection of eld wiring conductors.
Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
 These “Minimum Circuit Ampacity” values are to be used for sizing the eld power conductors. Refer to the National Electric Code (latest
revision), article 310 for power conductor sizing.
CAUTION: When more than one eld 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 dehumidication model performance information.
TABLE 2 — ELECTRICAL SPECIFICATIONS

Manual 2100-603
Page 6 of 44
FIGURE 1
UNIT DIMENSIONS
Q24H2D
Q60H2D
Q30H2D Q36H2D
Q42H2D
Q48H2D

Manual 2100-603
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 2100-603
Page 8 of 44
HANDLING UNIT AFTER REMOVAL
FROM SKID
The unit will have to be turned sideways and removed
from the skid to t 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 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 4
UNIT ON APPLIANCE CART
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.
Q-TEC UNIT
(Right Side)
APPLIANCE
CART
STRAP
COMPRESSOR

Manual 2100-603
Page 9 of 44
FIGURE 6
DUCTED APPLICATION
FIGURE 5
INSTALLATION WITH DUCT FREE PLENUM

Manual 2100-603
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 airow requirement of the equipment.
Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing. All duct work or
portions thereof not in the conditioned space should be
properly insulated in order to both conserve energy and
prevent condensation or moisture damage. 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 eld
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 airow 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 oor 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ow 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 lters [(1) 16x16 and (1)
16x20] are supplied with each unit. The lters slide
into lter brackets. Refer to Figure 8.
The lters 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 lter brackets are adjustable to
accommodate 2-inch lters. The tabs for the 1-inch
lters must be bent down to allow the 2-inch lters 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
TO BE FIELD
SUPPLIED
ATTACHMENT
SCREWS TO
BE FIELD
SUPPLIED
ROOM SIDE OF
Q-TEC UNIT
DUCT FLANGE
PROVIDED WITH
UNIT
FIGURE 8
FILTER LOCATION
RETURN AIR
GRILLE
FILTERS

Manual 2100-603
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 airow. The damper blade will now
open when the indoor blower is operating. If less than
maximum fresh airow 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 lter service door.
All capacity, efciency 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 efciency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.
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/lter 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 oor
or through the wall. If the drain is to be routed through
an unconditioned space, it must be protected from
freezing. The drain line must be able to be removed
from the unit if it is necessary to remove the unit from
the wall. When the side drain is used, the plug must be
removed and installed in the rear drain outlet.
The rear drain can be used with wall thickness of up to
10 inches where a water trap can be installed between
the unit and the interior wall. See Figure 10. The trap
cannot extend beyond the edge of the unit or it will
interfere with the wall mounting bracket. The drain can
be routed through the oor 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
ange 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 benets 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
outdoorcoildrainpan. Thisaidsinminimizingthe
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
ttings 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 efciency
when the indoor condensate is routed around the
outdoor coil drain pan/subcooler assembly. Unit
rated performance and efciency 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 2100-603
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 2100-603
Page 13 of 44
MIS-2469
DRAINBOX
WALL SLEEVE
OVERFLOW TUBE
CAULK AROUND TUBE
FIGURE 12A

Manual 2100-603
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 2100-603
Page 15 of 44
REMOVE KNOCK-OUT FOR
INDOOR DRAIN HOSE CONNECTOR
MIS-2471
FIGURE 12C
(If Used)

Manual 2100-603
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 2100-603
Page 17 of 44
Washer
Sleeve Stud
MIS-2689
Nut
Lower Control Panel
Condenser
Door (Removed)
Return Grille
FIGURE 13A
UNIT MOUNTING
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
CABINETATTACHMENT
MOUNTING BRACKET
#8 SCREW
PROVIDED
(LIGHT COLOR)
WALL
SLEEVE
#10 HEX
HEAD SCREW
PROVIDED
FIGURE 13B
UNIT MOUNTING

Manual 2100-603
Page 18 of 44
INSTALLATION INSTRUCTIONS
MOUNTING THE UNIT
When installing a Q-Tec unit near an interior wall on
the left side, a minimum of 8 inches is required; 12
inches is preferred.
When installing a Q-Tec unit near an interior wall on
the right side, a minimum of 18 inches is required as
additional space is required to connect the side drain.
If the rear condensate drain kit QCDS48 is used the
minimum can be reduced to 8 inches.
This clearance is required to allow for the attachment of
the unit to the sleeve and side trim pieces to the wall.
This unit is to be secured to the wall sleeve with
mounting brackets provided. The unit itself, the supply
duct and the free blow plenum are suitable of “0”
clearance to combustible material.
Following are the steps for mounting the 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.
Refer to Figure 14.
4. Roll the unit into the sleeve. Make sure to check
both sides of the unit as it is being rolled to
keep it centered in the sleeve. Also check the
alignment to the mounting brackets. This unit
must be level from side to side. If adjustments
are necessary, shim up under the rollers with
sheets of steel or any substance that is not
affected by moisture.
5. Make sure the gasket on the rear of the unit is
touching the sleeve across the top and down both
sides. This is a rain water seal.
6. Secure the mounting brackets to the unit with
screws provided, #10 hex head sheet metal
screws (Figure 13A) or use nut and washer to
secure sleeve (Figure 13B).
7. Bottom trim extensions are provided for use when
wall is less than 14 inches but greater than 10.5
inches. Secure to wall with screws (not provided).
8. Attach the bottom trim piece to the unit with the
screws provided (dark colored).
9. Position side trim pieces to wall and attach with
eld 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 ll 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 sufcient length to
trim up to a 10'2" ceiling.
NOTE: If the exterior wall thickness is between 5
inches to 10.5 inches, a side trim extension
piece kit, model QSTX42, is available.
REMOVE SCREWS FROM WHEELS
BEFORE ROLLING INTO PLACE
FIGURE 14
REMOVING LOCKING SCREWS FROM WHEELS

Manual 2100-603
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.
The 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 airow 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 satised, the system switches
back to normal air conditioning mode.
If the thermostat calls for cooling during
dehumidication mode, the call for cooling takes
precedence over the dehumidication and the unit will
cool until the thermostat is satised. Once the call for
cooling is satised, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in
the dehumidication mode, the electric heaters will
energize and the evaporator airow will return to the
heating airow. When the thermostat is satised, the
electric heaters will turn off and the airow will be
reduced and the system will continue to dehumidify
until humidistat is satised.
WIRING – MAIN POWER
Refer to the unit rating plate and/or Table 2 for wire
sizing information and maximum fuse or “HACR
Type” circuit breaker size. Each unit is marked with
a “Minimum Circuit Ampacity”. This means that the
eld wiring used must be sized to carry that amount
of current. Depending on the installed KW of electric
heat, there may be two eld power circuits required. If
this is the case, the unit serial plate will so indicate. All
models are suitable only for connection with copper
wire. Each unit and/or wiring diagram will be marked
“Use Copper Conductors Only”. These instructions
MUST BE adhered to. Refer to the National Electrical
Code (NEC) for complete current carrying capacity
data on the various insulation grades of wiring material.
All wiring must conform to NEC and all local codes.
The electrical data lists fuse and wire sizes (75°C copper)
for all models, including the most commonly used heater
sizes. Also shown are the number of eld power circuits
required for the various models with heaters.
The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or “HACR Type” circuit breaker that is to
be used with the equipment. The correct size must be
used for proper circuit protection, and also to assure that
there will be no nuisance tripping due to the momentary
high starting current of the compressor motor.
The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect.
FIGURE 15
COMPONENT LOCATION
TABLE 3
OPERATING VOLTAGE RANGE
NOTE: The voltage should be measured at the eld
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
See “Start Up” section for information on three phase
scroll compressor start-ups.
The eld 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.
TAP RANGE
240V 253 – 216
208V 220 – 187
DEHUMIDIFICATION
CONTROL
(OPTIONAL)
UNIT
MOUNTED
THERMOSTAT
LOCATION
ELECTRIC
HEATERS
CIRCUIT
BREAKER PANEL
& CONTROLS
I NDOOR
BLOWER
SIDE FIELD WIRE
ENTRANCE
LOWER
CONTROL
PANEL
REMOTE
THERMOSTAT
TERMINAL
BLOCK

Manual 2100-603
Page 20 of 44
If the unit is running in heat pump mode and the
humidistat calls for dehumidication, the
dehumidication mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.
The Climate Control Option I is an electronic,
programmable thermostat with humidistat and a CO2
controller. The subbase of the thermostat and CO2controller
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 airow 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 satised, the system switches back to
normal air conditioning mode.
If the thermostat calls for cooling during
dehumidication mode, the call for cooling takes
precedence over the dehumidication and the unit will
cool until the thermostat is satised. Once the call for
cooling is satised, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in the
dehumidication mode, the electric heaters will energize
and the evaporator airow will return to the heating airow.
When the thermostat is satised, the electric heaters will
turn off and the airow will be reduced and the system will
continue to dehumidify until humidistat is satised.
If the unit is running in heat pump mode and the
humidistat calls for dehumidication, the
dehumidication 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 CO2set point is 950 ppm. See Figure 24.
The Climate Control Option J & K are an electronic,
programmable thermostat, humidistat and CO2.
controller "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 airow 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 satised, the system switches back to
normal air conditioning mode.
If the thermostat calls for cooling during
dehumidication mode, the call for cooling takes
precedence over the dehumidication and the unit will
cool until the thermostat is satised. Once the call for
cooling is satised, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in the
dehumidication mode, the electric heaters will energize
and the evaporator airow will return to the heating
airow. When the thermostat is satised, the electric
heaters will turn off and the airow will be reduced and
the system will continue to dehumidify until humidistat
is satised.
If the unit is running in heat pump mode and the
humidstat calls for dehumidication, the
dehumidication 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.
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 CO2set
point is 1000 ppm.
NOTE: On option X, eld 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 st 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 dehumidication circuit.
Terminal “2” or pin 12 of P2 is the dehumidication
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.
“F” terminal of pin 5 of P2 is the ventilation input. This
terminal energizes any factory installed ventilation option.
NOTE: For total and proper control using DDC, a total of
7 controlled outputs are required (6 if no ventilation system
is installed). For proper system operation under Emergency
Heat conditions where the compressor needs to be deactivated,
the B-W2-E outputs need to be energized. Removing the Y
(compressor) signal alone turns the compressor off, but does
not activate the additional circuitry embedded in the heat pump
for proper and complete operation.
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