Bard QTEC QH303D User manual

Manual 2100-435D
Page 1 of 38
Models:
QH244D QH303D
QH363D QH423D
QH483D QH603D
QTEC SERIES
PACKAGED HEAT PUMP
INSTALLATION
INSTRUCTIONS
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914 . . . Moving ahead, just as planned.
Manual: 2100-435D
Supersedes: 2100-435C
File: Vol II Tab 14
Date: 02-10-06
© Copyright 2004
MIS-1554

Manual 2100-435D
Page 2 of 38
CONTENTS
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 .............................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 Side Drain ..............................................12
Figure 10 Optional 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 16-1 Details on LVTB Connections..............19
Figure 16A
Thermostat Wiring Diagram "E" Option .. 20
Figure 16B
Thermostat Wiring Diagram "F" Option .. 21
Figure 16C
Thermostat Wiring Diagram "G" Option .. 22
Figure 17 FreshAir Damper Removal....................26
Figure 18 QERV Removal......................................27
Figure 19 Low Pressure Control Bypass Timer......29
Figure 20 Dehumidification Mode Circuit ...............30
Figure 21 Cooling Mode Circuit..............................31
Figure 22 Heat Pump Control Board......................32
Figure 23 Fan Blade Setting ..................................35
Start Up
Description of Standard Equipment...........................23
Optional CFM ............................................................23
Important Installer Note.............................................23
Phase Monitor ...........................................................23
Three Phase Scroll Compressor Start Up
Information ................................................................23
Service Hints .............................................................24
Mist Eliminator Service..............................................24
Vent Options..............................................................25
Sequence of Operation .............................................28
Optional Climate Controls Sequence
of Operation ..............................................................28
Refrigerant Tube Schematic for Reheat Coil.............29
Pressure Service Ports .............................................29
Defrost Cycle.............................................................32
Troubleshooting
Solid State Heat Pump Control Troubleshooting
Procedure..................................................................34
Checking Temperature Sensor..................................34
Fan Blade Setting Dimensions..................................35
Refrigerant Charge....................................................35
Pressure Charts ...................................................36-37
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
General ..................................................................16
Tables
Table 1 Factory Built-In Electric Heat Table ...........2
Table 2 Electrical Specifications ............................3
Table 2A Electrical Specifications ............................4
Table 3 Operating Voltage Range........................13
Table 4 Wall Thermostats and Subbase
Combinations ..........................................15
Table 5 Troubleshooting ......................................31
Table 6 Temperature vs Resistance of
Temperature Sensor................................32
Table 7 Fan Blade Dimensions............................33
Table 8 Super Heat at Compressor .....................33
Table 9 Indoor Blower Performance ....................33
Table 10 Cooling Pressure ....................................34
Table 11 Heating Pressure ....................................35
Table 12 Dehumidification Relay Logic Board .......36

Manual 2100-435D
Page 3 of 38
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/NFPA90A
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 2100-435D
Page 4 of 38
QT EC MODEL NOMENCLATURE
QH 36 3 D A 10 X X X X X X
SPECIAL UNITS |
D - Dehumidification
w/Hot Gas Reheat
REVISION |
VOLTS & PHASE |
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
INTERNAL CONTROLS
X - Standard
• High Pressure Switch
• Low Pressure Switch
• Compressor Time Delay
E - LowAmbient Control
Q - OutdoorThermostat
R - LowAmbient Control &
OutdoorThermostat
COIL OPTIONS
X - Standard
CLIMATE CONTROL OPTIONS
X - None
E - Electronic/Prog/Man/Auto/Humidistat
F - Electronic/Non Prog/Man/Auto/
Humidistat/6hour timer
G - Electronic/Non Prog/Man/Auto/
Humidistat
MODEL NUMBER |
QH - QT EC 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 FreshAir Damper (Standard)
B - Blank-offPlate
R - Energy RecoveryVentilator w/Exhaust
P - Commercial Ventilator - Motorized w/Exhaust
PowerReturn
V - Commercial Ventilator - Motorized w/Exhaust
SpringReturn
FILTER OPTIONS
X- 1 Inch Fiberglass
(Standard)
F - 2 Inch Fiberglass
P- 2 Inch Pleated
COLOR OPTIONS
V - Platinumw/Slate
Front (Vinyl)
4 - Gray paint
TABLE 1
FACTORY BUILT-IN ELECTRIC HEAT TABLE
sledoM AD442HQ AD303HQBD442HQBD303HQCD442HQCD303HQ
AD363HQ AD324HQ AD384HQ AD306HQ
BD363HQ BD324HQ BD384HQ BD306HQ
CD363HQ CD324HQ CD384HQ CD306HQ
1-V0421-V8021-V0421-V8021-V0421-V8023-V0843-V0841-V0421-V8021-V0421-V8023-V084
WKHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTBHUTB
0.5083,61092,21
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

Manual 2100-435D
Page 5 of 38
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
ELECTRICALSPECIFICATIONS
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
Z0AD442HQ 50AD 01AD 1-802/032 1
12RO1
227427 030508 01
8
4
0101
8
----22 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0BD442HQ 60BD 90BD 3-802/032 1
1
1
715344 025354 21
8
8
210101 ------ ------ ------ ------ ------ ------ ------ ------
Z0CD442HQ 60CD 90CD 3-064 1
1
1
8
7122
510252 412101 412101 ------ ------ ------ ------ ------ ------ ------ ------
Z0AD303HQ 50AD 01AD 1-802/032 1
12RO1
429447 530508 8
8
4
0101
8
----42 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0BD303HQ 60BD 90BD 21BD
3-802/032
1
1
1
1
81635445 52045406 01
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD303HQ 60CD 90CD 21CD
3-064
1
1
1
1
9
813272
51025203 412101
8
41210101 -------- -------- -------- -------- -------- -------- -------- --------
Z0AD363HQ 50AD 01AD
4 D51A
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
Z0BD363HQ 60BD 90BD
5 D51B
3-802/032
1
1
1
1
32140525 03540506 01
8
8
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD363HQ 60CD 90CD
5 D51C
3-064
1
1
1
1
11024262 51020303 41010101 41010101 -------- -------- -------- -------- -------- -------- -------- --------

Manual 2100-435D
Page 6 of 38
TABLE 2A
ELECTRICALSPECIFICATIONS
(continued from Page 5)
TIUCRICELGNISTIUCRICLAUD
detaR &stloV sesahP
.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
.oNledoM TKCATKCBTKCATKCBTKCATKCBTKCATKCB
Z0AD324HQ 50AD 01AD
4 51AD
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
Z0BD324HQ 60B
D90BD
5 51BD
3-802/032
1
1
1
1
42342525
03540506
01
8
6
6
01010101
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Z0CD324HQ 60CD 90CD
5 51CD
3-064
1
1
1
1
61520303
02520303
21010101
21010101
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Z0AD384HQ 50AD 01AD
4 51AD
1-802/032
1
12ro1 2ro1
63166868
0607 001 001
8
6
3
3
01
8
8
8
–
636363
–
520505
–
060606
–
520505
–
8
8
8
–01
8
8
–010101
–010101
Z0BD384
HQ 60BD 90BD
5 51BD
3-802/032
1
1
1
1
62443535
04050606
8
8
6
6
01010101
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Z0CD384HQ 60CD 90CD
5 51CD
3-064
1
1
1
1
41327272
51520303
41010101
41010101
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Z0AD306HQ 50AD 01AD 51AD
1-802/032
12ro1 2ro1 2ro
1
84378989
0609 011 011
8
4
3
3
01
8
6
6
–
848484
–
520505
–
060606
–
520505
–
8
8
8
–01
8
8
–010101
–010101
Z0BD306HQ 90BD 51BD 3-802/032 1
1
1
239595
540707
8
6
6
010101
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Z0CD306HQ 90CD 51CD 3-064 1
1
1
811313
525353
01
8
8
01
8
8
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
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 2100-435D
Page 7 of 38
FIGURE 1
UNITDIMENSIONS

Manual 2100-435D
Page 8 of 38
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
AShipping Brackets BFront Wheels Over Edge CFront Wheels On Floor
Hold Skid Down
It is recommended that the unit not be removed from
the skid with a fork lift 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 skit 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.
MIS-1007
FIGURE 2
AIR SEAL UNDER QT
EC UNIT
MIS-1008
Air Seal

Manual 2100-435D
Page 9 of 38
HANDLING UNIT AFTER REMOVAL
FROM SKID
FIGURE 4
UNIT ON APPLIANCE CART
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.
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
MIS-1555
STRAP

Manual 2100-435D
Page 10 of 38
FIGURE 6
DUCTEDAPPLICATION
MIS-1574
FIGURE 5
INSTALLATION WITH FREE BLOW PLENUM
CEILING
8 FT. - 6 IN.
MINIMUM RECOMMENDED
CEILING HEIGHT
8 FT. - 5 IN.
FLOOR
MIS-1573
SUSPENDED
CEILING FIXED CEILING DUCT
DUCT FLANGE
8 FT. - 7 IN.
MINIMUM RECOMMENDED
CEILING HEIGHT
7 FT. - 4 IN.
UNIT HEIGHT
12 IN.
MINIMUM
2 IN. MINIMUM
FROM DUCT FLANGE
TO DUCT BOTTOM
8 FT. - 4.5 IN.
MINIMUM REQUIRED
INSTALLATION HEIGHT
FLOOR
20 IN.
MINIMUM

Manual 2100-435D
Page 11 of 38
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 flow 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.
For hot water coil options a QPBHW**-F for free blow
or QPBHW**-D for ducted airflow is used.
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.
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 8.
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
SUPPLYDUCT CONNECTIONS
SUPPLY DUCT
TO BE FIELD
SUPPLIED
ATTACHMENT
SCREWS TO
BE FIELD
SUPPLIED
ROOM SIDE OF
QTEC UNIT DUCT FLANGE
PROVIDED WITH
UNIT
MIS-978
FIGURE 8
FILTERLOCATION
MIS-1575
FILTERS
RETURN AIR
GRILLE

Manual 2100-435D
Page 12 of 38
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 flow. The damper blade will now
open when the indoor blower is operating. If less than
maximum fresh air flow 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.
FIGURE 9
OPTIONAL SIDE DRAIN (SIDE VIEW)
INSTALLATION
QTEC UNIT
FIGURE 10
STANDARDREAR DRAIN

Manual 2100-435D
Page 13 of 38
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.
MIS-1061
FIGURE 12
UNITMOUNTING
BOTTOM
TRIM PIECE BOTTOM TRIM
EXTENSION
MOUNTING
BRACKET
SIDE TRIM
(2 PCS.)
SIDE TRIM
(2 PCS.)
MIS-1576
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
MIS-977
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 2100-435D
Page 14 of 38
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.
MIS-1018
REMOVE SCREWS FROM
WHEELS BEFORE ROLLING
INTO PLACE
FIGURE 13
REMOVING LOCKING SCREWS FROM WHEELS

Manual 2100-435D
Page 15 of 38
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 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 E is an electronic,
programmable thermostat and a humidistat. The sub
base of the thermostat and the humidistat are factory
wired to the front panel of the unit. See Figure 16A for
wiring diagram. Compatible for use with Energy
Recovery Ventilator or Ventilator.
The Climate Control Option F is an electronic, non-
programmable thermostat, timer and a humidistat. The
sub base of the thermostat and the timer are factory
wired to the front panel of the unit. See Figure 16B for
wiring diagram. Compatible for use with Energy
Recovery Ventilator or Ventilator.
The Climate Control Option G is an electronic,
non-programmable thermostat and humidistat. The
subbase of the thermostat is factory wired to the front
panel of the unit. This option is compatible for use with
the optional CS2000A Energy Control Monitor and a
terminal block is provided for connection to the
CS2000A. See Figure 16C for wiring diagram.
Compatible for use with Energy Recovery Ventilator or
Ventilator.
NOTE: On options X and G the CS2000A (or other
field provided means to control ventilation)
must be used if any of the mechanical
(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
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 form 240V to 208V tap.
The acceptable operating voltage range for the 240 and
208V taps are as noted in Table 3.
TABLE 3
OPERATINGVOLTAGERANGE
PATEGNAR
V042612–352
V802781–022
MIS-1577
DEHUMIDIFICATION
CONTROL
THERMOSTAT
& HUMIDISTAT
CONTROLS
ELECTRIC
HEATERS
CIRCUIT
BREAKER PANEL
& CONTROLS
INDOOR
BLOWER
REMOTE
THERMOSTAT
TERMINAL
BLOCK
SIDE FIELD WIRE
ENTRANCE
LOWER
CONTROL
PANEL
FIGURE 14
COMPONENTLOCATION

Manual 2100-435D
Page 16 of 38
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 P4 is the fan input.
“Y” terminal or pin 7 of P4 is the compressor input.
“B” terminal or pin 8 of P4 is the reversing valve input.
The reversing valve must be energized for heating
mode.
“R” terminal or pin 10 of P4 is 24 VAC hot.
“C” terminal or pin 11 of P4 is 24 VAC grounded.
“L” terminal or pin 12 of P4 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 P4 is second stage heat (if
equipped). If the unit is equipped with an optional hot
water coil plenum box the water valve will be connected
to this terminal.
“O1” terminal of pin 5 of P4 is the ventilation input.
This terminal energizes any factory installed
ventilation option.
“E” terminal or pin 3 of P4 is the emergency heat input.
This terminal energizes the emergency heat relay.
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.
“5” terminal or pin 2 of P4 is the 24 dehumidification
circuit.
“4” terminal of pin 4 or P4 is the dehumidification
circuit.. A contact must connect terminals 4 and 5.
“6” terminal of pin 1 of P4 is VAC grounded to the
humidistat, if needed.
SNOITCENNOCEGATLOVWOL ROF LORTNOCCDD
ylnOnaFGezigrenE
edoMgnilooCG,YezigrenE
pmuPtaeH gnitaeH B,G,YezigrenE
gnitaeHegatSdn2 )deyolpmefi( 2W,GezigrenE
noitalitneV1O,GezigrenE
noitacifidimuheD5dna4tcennoC
taeHycnegremEE,2W,BezigrenE
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.

Manual 2100-435D
Page 17 of 38
MIS-1285
THERMOSTATPLUG TERMINALS
P2 AND P4
(VIEWED FROM PIN END)
BLOWERMOTOR
LOW VOLTAGE PLUG
(VIEWED FROM PIN END)
FIGURE 15
TABLE 4
WALLTHERMOSTATSAND SUBBASECOMBINATIONS
tatsomrehTesabbuSserutaeFtnanimoderP
810-3048 )4201N478T( 010-4048 )1621476Q( )2(looC/taeHcitamotuA noitisoPrevoegnahC
830-3048 )A006H( A/NtatsidimuH
240-3048 )0701G1158T( A/N looC/taeH/otuA/launaM cinortcelEelbammargorP-noN
940-3048 )083-39F1( A/N looC/taeHelbammargorP cinortcelE

Manual 2100-435D
Page 18 of 38
RAT
C
R
E1
BK
TWV
YO
A2
Y
B
L
L
E1
G1
RV
W
A1
W2
G
D
Relay Logic Board
Return Air Thermostat
Plug #2
Purple
Red
Yellow
Orange
Tan
Yellow
Black
Brown
Blue Yellow
Orange Tan
Orange
Red
Red
RedRed
Black
Black
Black
Red
23
1 2 3 4 5 6
7
8
9
10 11
12
Y1
G E
7
6
5
4
3 2 1
Plug #4
8
B
W2
R
C
L12
11
10
9Brown
Blue
W1 W1 Y1
W1
L
C
R
W2
L
C
R
W2
B
B
E1
G
A1
Y1
4
35
6
Y
G
O1
4
E
5 6Blue
Red
Red
Yellow
Tan
Orange
Yellow
Blue
Brown
Red
Black
H200
Humidistat
IF93-380
Thermostat Low Voltage
Term. Block
T8511
Thermostat
FIGURE 16
THERMOSTATWIRINGDIAGRAM
“X” THERMOSTAT OPTION
DEHUMIDIFICATION MODULE
4102-036
NOTE: SEE NEXT PAGE FOR ADDITIONAL DETAILS ON LVTB CONNECTION IDENTIFICATION

Manual 2100-435D
Page 19 of 38
FIGURE 16-1
DETAILS OF LVTB CONNECTION
NOTE: On options X and G the CS2000A (or other field provided means to
control ventilation) must be used if any of the mechanical (motorized)
ventilation options are installed.
DEHUM CIRCUIT
24 VAC COM
DEHUM CIRCUIT
COMPRESSOR
NOTE: FIELD SUPPLIED DEHUMIDISTAT
MUST BE DRY CONTACT
CONNECTED TO TERMINALS 5
AND 4 ON LVTB
REVERSING VALVE
2ND STAGE HEAT
EMERGENCY HEAT
24VAC COM
BLOWER
VENTILATOR OR DAMPER

Manual 2100-435D
Page 20 of 38
RAT
C
R
E1
BK
TWV
YO
A2
Y
B
L
L
E1
G1
RV
W
A1
W2
G
D
Relay Logic Board
Return Air Thermostat
Plug #2
Purple
Red
Yellow
Orange
Tan
Yellow
Black
Brown
Blue Yellow
Orange Tan
Orange
Red
Red
RedRed
Black
Black
Black
Red
23
1 2 3 4 5 6
7
8
9
10 11
12
7
6
5
4
3 2 1
Plug #4
8
12
11
10
9Brown
Blue
W1
L
C
R
W2
B
E1
G
A1
Y1
Blue
Red
Red
Tan
Orange
Yellow
Blue
Brown
Red
Black
H200
Humidistat
IF93-380
Thermostat
4
35
6
Yellow
Yellow
FIGURE 16A
REMOTETHERMOSTATWIRING DIAGRAM
“E” THERMOSTAT OPTION
DEHUMIDIFICATION MODULE
4102-037