Bard QTEC QH243 User manual

Manual 2100-420H
Page 1 of 34
Models:
QH243 QH302
QH362 QH422
QH482 QH602
QTEC SERIES
PACKAGED HEAT PUMP
INSTALLATION
INSTRUCTIONS
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Since 1914 . . . Moving ahead, just as planned.
Manual: 2100-420H
Supersedes: 2100-420G
File: Vol II Tab 14
Date: 06-28-07
© Copyright 2004

Manual 2100-420H
Page 2 of 34
CONTENTS
Getting Other Information and Publications
For more information, contact these publishers: .......... 3
QTEC General Information
QTEC Model Nomenclature .......................................... 4
Shipping Damage ......................................................... 8
Unit Removal From Skid .............................................. 8
Handling Unit After Removal From Skid ....................... 9
General ......................................................................... 9
Minimum Installation Height ......................................... 9
Duct Work .................................................................. 11
Filters .......................................................................... 11
Fresh Air Intake .......................................................... 12
Condensate Drain ...................................................... 12
Service Light ............................................................... 13
Installation Instructions
Mounting the Unit ....................................................... 14
Wiring — Main Power ................................................. 15
Wiring — Low Voltage Wiring ..................................... 15
Low Voltage Connections ........................................... 16
Start Up
Description of Standard Equipment ............................... 21
Optional CFM (QH362, QH422, QH482 & QH602 Only) ..... 21
Important Installer Note .................................................. 21
Phase Monitor ................................................................ 21
Three Phase Scroll Compressor Start Up
Information ................................................................ 21
Service Hints .................................................................. 22
Mist Eliminator Service .................................................. 22
Vent Options .................................................................. 23
Sequence of Operation .................................................. 26
Optional Climate Controls Sequence
of Operation .............................................................. 26
Pressure Service Ports .................................................. 26
Defrost Cycle ................................................................. 27
Troubleshooting
Solid State Heat Pump Control Troubleshooting
Procedure ...................................................................... 29
Checking Temperature Sensor ...................................... 29
Troubleshooting GE ECM™ Blower Motors ............. 30-31
Fan Blade Setting Dimensions ...................................... 32
Refrigerant Charge ........................................................ 32
Pressure Charts ...................................................... 33 - 34
Figures
Figure 1 Unit Dimensions .......................................... 7
Figure 2 Air Seal on Bottom of Unit ........................... 8
Figure 3 Removal of Unit From Skid ......................... 8
Figure 4 Unit on Appliance Cart for Moving ............... 9
Figure 5 Installation With Free Blow Plenum .......... 10
Figure 6 Ducted Application ..................................... 10
Figure 7 Supply Duct Connections .......................... 11
Figure 8 Filter Location ............................................ 11
Figure 9 Optional Side Drain ................................... 12
Figure 10 Standard Rear Drain .................................. 12
Figure 11 Rear Drain (Top View) ............................... 13
Figure 12 Unit Mounting ............................................ 13
Figure 13 Removing Locking Screws from Wheels... 14
Figure 14 Component Location ................................. 15
Figure 15 Thermostat Plug Terminals ........................ 17
Figure 16 Thermostat Wiring Diagram "X" Option .... 18
Figure 17 Thermostat Wiring Diagram "A" Option .... 19
Figure 18 Thermostat Wiring Diagram "D" Option ... 20
Figure 19 Fresh Air Damper Removal ....................... 24
Figure 20 QERV Removal ......................................... 25
Figure 21 Heat Pump Control Board ......................... 26
Figure 22 Low Pressure Control Bypass Timer ......... 27
Figure 23 Control Disassembly ................................. 31
Figure 24 Winding Test .............................................. 31
Figure 25 Drip Loop ................................................... 31
Figure 26 Fan Blade Setting ...................................... 32
Tables
T
able 1 Factory Built-In Electric Heat Table .............. 4
Table 2 Electrical Specifications ................................ 5
Table 2A Electrical Specifications ................................ 6
Table 3 Operating Voltage Range ........................... 15
Table 4 Wall Thermostats ........................................ 17
Table 5 Troubleshooting .......................................... 28
Table 6 Temperature vs Resistance of
Temperature Sensor ................................... 29
Table 7 Fan Blade Dimensions ............................... 32
Table 8 Super Heat at Compressor ......................... 32
Table 9 Indoor Blower Performance ........................ 32
Table 10 Cooling Pressure ........................................ 33
Table 11 Heating Pressure ........................................ 34

Manual 2100-420H
Page 3 of 34
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 2100-420H
Page 4 of 34
TABLE 1
FACTORY BUILT-IN ELECTRIC HEAT TABLE
sledoM A-342HQ A-203HQB-342HQB-203HQC-342HQC-203HQ
A-263HQ A-224HQ A-284HQ A-206HQ B-263HQ B-224HQ B-284HQ B-206HQ C-263HQ C-224HQ C-284HQ C-206HQ
1-V0421-V8021-V0421-V8021-V0421-V8023-V0843-V0841-V0421-V8021-V0421-V8023-V084
WKHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTB
0.5083,61092,21 083,61092,21
0.6005,02063,51005,02063,51005,02005,02005,02063,51005,02
0.9007,03000,32007,03000,32007,03007,03007,03000,32007,03
0.01076,23075,42 076,23075,42
0.21000,14007,03000,14
0.51 051,94068,63051,94068,63051,94
QT EC Series General Information
QT EC MODEL NOMENCLATURE
QH 36 2 – A 10 X X X X X X
SPECIAL UNITS |
L - Low Ampacity Circuit
REVISION |
VOLTS & PHASE |
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
I NTERNAL CONTROLS
X - Standard
• High Pressure Switch
• Low Pressure Switch
• Compressor Time Delay
E - Low Ambient Control
Q - Outdoor Thermostat
R - Low Ambient Control &
Outdoor Thermostat
COIL OPTIONS
X - Standard
CLIMATE CONTROL OPTIONS
X - None
A - Electronic/Non Prog/Man C/O
D - Electronic/Prog/Man/Auto
MODEL NUMBER |
QH - QTEC Model
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
VENTILATION OPTIONS
X - Barometric Fresh Air Damper (Standard)
B - Blank-off Plate
V - Commercial Ventilator - Motorized w/Exhaust
Spring Return
P - Commercial Ventilator - Motorized w/Exhaust
Power Return
R - Energy Recovery Ventilator w/Exhaust
FILTER OPTIONS
X - 1-Inch Fiberglass
(Standard)
F - 2-Inch Fiberglass
P - 2-Inch Pleated
COLOR OPTIONS
V - Platinum w/Slate
Front (Vinyl)
4 - Gray paint

Manual 2100-420H
Page 5 of 34
ELECTRICAL SPECIFICATIONS CONTINUED ON PAGE 6 TABLE 2A
1Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
2Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
3These “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.
4Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
5Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.
TABLE 2
ELECTRICAL SPECIFICATIONS
SLEDOM
DETAR &STLOV SESAHP
TIUCRICELGNISTIUCRICLAUD
.ON DLEIF REWOP STIUCRIC
3
MUMINIM TIUCRIC YTICAPMA
1
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
2
DLEIF REWOP ERIW EZIS
2
DNUORG ERIW EZIS
3
MUMINIM TIUCRIC YTICAPMA
1
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
2
DLEIF REWOP EZISERIW
2
DNUORG EZISERIW
TKCATKCBTKCATKCBTKCATKCBTKCATKCB
Z0A-342HQ 50A- 01A- 1-802/032 1
12RO1
227427 030508 01
8
4
0101
8
----22 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0B-342HQ 60B- 90B- 3-802/032 1
1
1
715344 025354 21
8
8
210101 ------ ------ ------ ------ ------ ------ ------ ------
Z0C-342HQ 60C- 90C- 3-064 1
1
1
8
7122
510252 412101 412101 ------ ------ ------ ------ ------ ------ ------ ------
Z0A-203HQ 50A- 01A- 1-802/032 1
12RO1
429447 530508 8
8
4
0101
8
----42 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0B-203HQ 60B- 90B- 21B-
3-802/032
1
1
1
1
81635445 52045406 01
8
8
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0C-203HQ 60C- 90C- 21C-
3-064
1
1
1
1
9
813272
51025203 41210101 41210101 -------- -------- -------- -------- -------- -------- -------- --------
Z0A-263HQ 50A- 01A-
4 - 51A
3-802/032
1
12RO1 2RO1
92459728 54060909 8
6
4
4
0101
8
8
----9223 ----0505 ----0404 ----0505 ----
8
8
----
8
8
----0101 ----0101
Z0B-263HQ 60B- 90B-
5 - 51B
3-802/032
1
1
1
1
32140525 03540506 01
8
8
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0C-263HQ 60C- 90C-
5 - 51C
3-064
1
1
1
1
11024262 51020303 41210101 41210101 -------- -------- -------- -------- -------- -------- -------- --------

Manual 2100-420H
Page 6 of 34
TABLE 2A
ELECTRICAL SPECIFICATIONS
(Continued)
LEDOM
DETAR &STLOV ESAHP
TIUCRICELGNISTIUCRICLAUD
.ON DLEIF REWOP STIUCRIC
3
MUMINIM TIUCRIC YTICAPMA
1
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
2
DLEIF REWOP ERIW EZIS
2
DNUORG ERIW EZIS
3
MUMINIM TIUCRIC YTICAPMA
1
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
2
DLEIF REWOP EZISERIW
2
DNUORG EZISERIW
TKCATKCBTKCATKCBTKCATKCBTKCATKCB
Z0A-224HQ 50A- 01A-
4 - 51A
1-802/032
1
12RO1 2RO1
33853838 05060909 8
6
4
4
0101
8
8
----3333 ----0505 ----0404 ----0505 ----
8
8
----
8
8
----0101 ----0101
Z0B-224HQ 60B- 90B-
5 - 51B
3-802/032
1
1
1
1
42342525 03050606 01
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0C-224HQ 60C- 90C-
5 - 51C
3-064
1
1
1
1
21126262 51520303 41010101 41010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0A-284HQ 50A- 01A-
4 - 51A
1-802/032
1
12RO1 2RO1
63166868 05070909 8
6
3
3
01
8
8
8
--636363 --520505 --050505 --520505 --
8
8
8
--01
8
8
--010101 --010101
Z0B-284HQ 60B- 90B-
5 - 51B
3-802/032
1
1
1
1
62443535 04050606 8
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0C-284HQ 60C- 90C-
5 - 51C
3-064
1
1
1
1
41327272 51520303 41010101 41010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0A-206HQ 50A- 01A-
4 51A-
1-802/032
12ro1 2ro1 2ro1 64176969 0608 011 011 8
4
3
3
01
8
6
6
--646464 --520505 --060606 --520505 --
8
8
8
--01
8
8
--010101 --010101
Z0B-206HQ 90B-
5 51B- 3-802/032 1
1
1
138585 540707 8
6
6
01
8
8
------ ------ ------ ------ ------ ------ ------ ------
Z0C-206HQ 90C-
5 51C- 3-064 1
1
1
710303 525353 01
8
8
010101 ------ ------ ------ ------ ------ ------ ------ ------
1Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
2Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
3These “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.
4Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
5Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.

Manual 2100-420H
Page 7 of 34
FIGURE 1
UNIT DIMENSIONS

Manual 2100-420H
Page 8 of 34
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 QT
EC UNIT
Air Seal
AShipping Brackets BFront Wheels Over Edge CFront Wheels On Floor
Hold
Skid
Down

Manual 2100-420H
Page 9 of 34
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 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 floor where the unit is to be moved on
the rollers. Failure to do so could result in the
unit tipping over and causing bodily injury and/
or damage to the unit.
QTEC UNIT
(Right Side)
APPLIANCE
CART
COMPRESSOR
STRAP

Manual 2100-420H
Page 10 of 34
FIGURE 6
DUCTED APPLICATION
FIGURE 5
INSTALLATION WITH FREE BLOW PLENUM

Manual 2100-420H
Page 11 of 34
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 QT
EC 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.
NOTE: Unit cabinet, supply air duct and free blow
plenum are approved for “0” clearance to
combustible material.
The QT EC 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 air
flow up to the maximum ESP shown in Table 9.
However, for quiet operation of the air system, the duct
static should be kept as low as practical, within the
guidelines of good duct design.
FILTERS
Two 1-inch throw away filters [(1) 16x16 and (1)
16x20] are supplied with each unit. The filters slide into
filter brackets. Refer to Figure 8.
The filters are serviced from the inside of the building
by opening the hinged door. This door is attached by
1/4 turn fasteners and one locking latch.
The internal filter brackets are adjustable to
accommodate 2-inch filters. The tabs for the 1-inch
filters must be bent down to allow the 2-inch filters to
slide in place.
FIGURE 7
SUPPLY DUCT CONNECTIONS
SUPPLY DUCT
TO BE FIELD
SUPPLIED
ATTACHMENT
SCREWS TO
BE FIELD
SUPPLIED
ROOM SIDE
OF QTEC UNIT
DUCT FLANGE
PROVIDED WITH
UNIT
FIGURE 8
FILTER LOCATION
FILTERS
RETURN AIR
GRILLE

Manual 2100-420H
Page 12 of 34
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.
For details on energy recovery ventilation see separate
section.
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 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, both standard and heated
versions, are available to facilitate easy installation, and
also removability of heat pump for service. The
standard version provides a connection that allows the
evaporator condensate to drain independently bypassing
the lower drain pan. Note that on models equipped with
a refrigerant subcooler in the lower drain pan may
experience a slight decrease in cooling performance and
efficiency.
FIGURE 10
STANDARD REAR DRAIN
FIGURE 9
OPTIONAL SIDE DRAIN (SIDE VIEW)
INSTALLATION
QTEC UNIT

Manual 2100-420H
Page 13 of 34
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.
FIGURE 12
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
CABINET ATTACHMENT
MOUNTING BRACKET
#8 SCREW
PROVIDED
(LIGHT COLOR)
WALL
SLEEVE
#10 HEX
HEAD SCREW
PROVIDED
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

Manual 2100-420H
Page 14 of 34
INSTALLATION INSTRUCTIONS
MOUNTING THE UNIT
When installing a QT EC unit near an interior wall on the
left side, a minimum of 8 inches is required; 12 inches is
preferred.
When installing a QT EC unit near an interior wall on the
right side, a minimum of 18 inches is required as
additional space is required to connect the side drain. If
the rear condensate drain kit QCDS48 is used the
minimum can be reduced to 8 inches.
This clearance is required to allow for the attachment of
the unit to the sleeve and side trim pieces to the wall.
This unit is to be secured to the wall sleeve with
mounting brackets provided. The unit itself, the supply
duct and the free blow plenum are suitable of “0”
clearance to combustible material.
Following are the steps for mounting the QT EC , for
reference see Figure 12 (page 13).
1. Attach mounting brackets to the wall sleeve with
screws provided.
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 13.
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.
7. Bottom trim extensions are provided for use when
wall is less than 14 inches but greater than 10.5
inches. Secure to wall with screws (not
provided).
8. Attach the bottom trim piece to the unit with the
screws provided (dark colored).
9. Position side trim pieces to wall and attach with
field supplied screws. There are two long pieces
and two short pieces supplied. The long pieces
are to enclose the gap behind the unit. The short
pieces are to fill the gap behind the cabinet
extension or the free blow plenum box. The may
be cut to suit your ceiling height or overlap the
unit side trim. There is sufficient length to trip 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 13
REMOVING LOCKING SCREWS FROM WHEELS

Manual 2100-420H
Page 15 of 34
The standard Climate Control Option X is a remote
thermostat connection terminal block. See Figure 16 for
wiring diagram. Compatible thermostats are listed in
Table 4.
The Climate Control Option A is an electronic, non-
programmable manual or auto changeover thermostat.
The subbase of the thermostat is factory wired to the
front panel of the unit. See Figure 17 for wiring
diagram. Compatible for use with Bard CS2000A1
Controller and Energy Recovery Ventilator.
The Climate Control Option D is an electronic,
programmable thermostat. The subbase of the
thermostat is factory wired to the front panel of the unit.
See Figure 18 for wiring diagram. Compatible for use
with Energy Recovery Ventilator or Economizer.
NOTE: On option X or A the CS2000A1 (or other field
provided means to control ventilation) must be
used if any of the motorized ventilation options
are installed.
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
field wiring used must be sized to carry that amount of
current. Depending on the installed KW of electric
heat, there may be two field power circuits required. If
this is the case, the unit serial plate will so indicate. All
models are suitable only for connection with copper
wire. Each unit and/or wiring diagram will be marked
“Use Copper Conductors Only”. These instructions
MUST BE adhered to. Refer to the National Electrical
Code (NEC) for complete current carrying capacity data
on the various insulation grades of wiring material. All
wiring must conform to NEC and all local codes.
The electrical data lists fuse and wire sizes (75°C
copper) for all models, including the most commonly
used heater sizes. Also shown are the number of field
power circuits required for the various models with
heaters.
The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or “HACR Type” circuit breaker that is to
be used with the equipment. The correct size must be
used for proper circuit protection, and also to assure that
FIGURE 14
COMPONENT LOCATION
TABLE 3
OPERATING VOLTAGE RANGE
NOTE: The voltage should be measured at the filed
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
PATEGNAR
V042612–352
V802781–022
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.
The field wiring connections are located behind the top
and hinged panel in the circuit breaker panel. See
Figure 14.
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.
DEHUMIDIFICATION
CONTROL
(OPTIONAL)
UNIT
MOUNTED
THERMOSTAT
LOCATION
ELECTRIC
HEATERS
CIRCUIT
BREAKER PANEL
& CONTROLS
I NDOOR
BLOWER
REMOTE
THERMOSTAT
TERMINAL
BLOCK
SIDE FIELD WIRE
ENTRANCE
LOWER
CONTROL
PANEL

Manual 2100-420H
Page 16 of 34
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 pins 6 and 1 of P2 are the fan inputs.
Both must be energized for proper fan operation. This
is done automatically in the factory installed climate
control options. If the climate control option is
abandoned and connections are made directly to P2 both
pins 6 and 1 of P2 must be energized for proper
operation.
“Y” terminal or pin 7 of P2 is the compressor input.
“B” terminal or pin 8 of P2 is the reversing valve input.
The reversing valve must be energized for heating
mode.
“R” terminal or pin 10 of P2 is 24 VAC hot.
“C” terminal or pin 11 of P2 is 24 VAC grounded.
“L” terminal or pin 12 of P2 is compressor lockout
output . This terminal is activated on a high or low
pressure trip by the electronic heat pump control. This
is a 24 VAC output.
“W2” terminal or pin 9 of P2 is second stage heat (if
equipped). If the unit is equipped with an optional hot
water coil plenum box or electric heat these will be
energized by this terminal.
“O1” terminal of pin 5 of P2 is the ventilation input.
This terminal energizes any factory installed ventilation
option.
“E” terminal or pin 3 of P2 is the emergency heat input.
This terminal energizes the emergency heat relay.
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GENERAL
This unit is equipped with a variable speed ECM motor.
The motor is designed to maintain rated airflow up to
the maximum static allowed. It is important that the
blower motor plugs are not plugged in or unplugged
while the power is on. Failure to remove power prior
to unplugging or plugging in the motor could result in
motor failure.
CAUTION
Do not plug in or unplug blower motor
connectors while the power is on. Failure to do
so may result in motor failure.
NOTE: For total and proper control using DDC, a total
of 6 controlled outputs are required (5 if no
ventilation system is installed). For proper
system operation under Emergency Heat
conditions. Where the compressor needs to be
deactivated, the B-W2-E outputs need to be
energized. Removing the Y (compressor) signal
alone turns the compressor off, but does not
activate the additional circuitry embedded in
the heat pump for proper and complete
operation.

Manual 2100-420H
Page 17 of 34
MIS-1285
FIGURE 15
TABLE 4
WALL THERMOSTATS
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060-3048 )544-0211(
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850-3048 )1511D0225HT(
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Manual 2100-420H
Page 18 of 34
FIGURE 16
REMOTE THERMOSTAT WIRING DIAGRAM
“X” THERMOSTAT OPTION
NOTE: On option X or A the CS2000A1 (or other field
provided means to control ventilation) must be
used if any of the motorized ventilation options
are installed.
VENTILATOR OR DAMPER

Manual 2100-420H
Page 19 of 34
FIGURE 17
UNIT MOUNTED THERMOSTAT WIRING DIAGRAM
“A” THERMOSTAT OPTION
NOTE: On option X or A the CS2000A1 (or other field
provided means to control ventilation) must be used
if any of the motorized ventilation options are
installed.

Manual 2100-420H
Page 20 of 34
FIGURE 18
UNIT MOUNTED THERMOSTAT WIRING DIAGRAM
“D” THERMOSTAT OPTION