Bard QH242D User manual

Models:
QH242D QH302D
QH362D QH422D
QH482D
QTEC SERIES
PACKAGED HEAT PUMP
INSTALLATION
INSTRUCTIONS
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914 . . . Moving ahead, just as planned.
Manual: 2100-380
Supersedes:
File: Vol II Tab 14
Date: 12-11-00
© Copyright 2000
MIS-1554

CONTENTS
i
Getting Other Information and Publications
For more information, contact these publishers:......1
QTEC General Information
QTEC Model Nomenclature......................................2
Shipping Damage ....................................................6
Unit Removal From Skid ..........................................6
Handling Unit After Removal From Skid ..................7
General ....................................................................7
Minimum Installation Height.....................................7
Duct Work ................................................................9
Filters .......................................................................9
Fresh Air Intake .....................................................10
Condensate Drain..................................................10
Service Light .......................................................... 11
Installation Instructions
Mounting the Unit...................................................12
Wiring — Main Power ............................................13
Wiring — Low Voltage Wiring ................................13
Figures
Figure 1 Unit Dimensions.......................................5
Figure 2 Air Seal on Bottom of Unit........................6
Figure 3 Removal of Unit From Skid ......................6
Figure 4 Unit on Appliance Cart.............................7
Figure 5 Installation With Free Blow Plenum.........8
Figure 6 Ducted Application ...................................8
Figure 7 Supply Duct Connections ........................9
Figure 8 Filter Location ..........................................9
Figure 9 Side Drain ..............................................10
Figure 10 Optional Rear Drain ...............................10
Figure 11 Rear Drain (Top View)............................ 11
Figure 12 Unit Mounting......................................... 11
Figure 13 Removing Locking Screws
From Wheels .........................................12
Figure 14 Component Location..............................13
Figure 15 Thermostat Plug Terminals ....................14
Figure 16 Thermostat Wiring Diagram "E" Option 15
Figure 16A Thermostat Wiring Diagram "X" Option16
Figure 16B Thermostat Wiring Diagram "F" Option17
Figure 17 Fresh Air Damper Removal....................21
Figure 18 QERV Removal......................................22
Figure 19 Dehumidification Mode Circuit ...............25
Figure 20 Cooling Mode Circuit..............................26
Figure 21 Heat Pump Control Board......................27
Figure 22 Fan Blade Setting ..................................30
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 ..........................................14
Table 5 Troubleshooting ......................................28
Table 6 Temperature vs Resistance of
Temperature Sensor................................29
Table 7 Fan Blade Dimensions............................30
Table 8 Suction Line Temperatures .....................30
Table 9 Indoor Blower Performance ....................30
Table 10 Cooling Pressure ....................................31
Table 11 Heating Pressure ....................................32
Table 12 Optional Accessories ..............................33
Start Up
Description of Standard Equipment ..........................18
Optional CFM ............................................................18
Important Installer Note.............................................18
Phase Monitor ...........................................................18
Three Phase Scroll Compressor Start Up
Information ................................................................18
Service Hints .............................................................19
Mist Eliminator Service................................................1
Vent Options..............................................................20
Sequence of Operation .............................................23
Optional Climate Controls Sequence
of Operation ..............................................................23
Refrigerant Tube Schematic for Reheat Coil.............24
Pressure Service Ports .............................................25
Defrost Cycle.............................................................27
Troubleshooting
Solid State Heat Pump Control Troubleshooting
Procedure..................................................................29
Checking Temperature Sensor..................................29
Fan Blade Setting Dimensions..................................30
Refrigerant Charge....................................................30
Pressure Charts ...................................................31-32
Optional Accessories ................................................33

Manual 2100-380
Page 1
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 AirConditioning ContractorsofAmerica
1712 New Hampshire Avenue
Washington, DC 20009
Telephone: [phone]
Fax: [phone]
ANSI AmericanNationalStandardsInstitute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE AmericanSociety ofHeating,Refrigeration,
andAir ConditioningEngineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA NationalFireProtection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

Manual 2100-380
Page 2
TABLE 1
FACTORYBUILT-INELECTRICHEATTABLE
sledoM AD242HQ AD203HQBD242HQBD203HQCD242HQCD203HQ
AD263HQ AD224HQ AD284HQ BD263HQ BD224HQ BD284HQ CD263HQ CD224HQ CD284HQ
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 MODEL NOMENCLATURE
QH 36 2 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 - Low Ambient Control
Q - Outdoor Thermostat
R - Low Ambient Control &
Outdoor Thermostat
COIL OPTIONS
X - Standard
CLIMATE CONTROL OPTIONS
X - None
E - Electronic/Prog/Man/Auto/Humidistat
F - Electronic/Non Prog/Man/Auto/
Humidistat/6 hour timer
MODEL NUMBER |
QH - QT EC Model
CAPACITY |
24 - 2 Ton
30 - 2-1/2 Ton
36 - 3 Ton
42 - 3-1/2 Ton
48 - 4 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
R - Energy Recovery Ventilator w/Exhaust
P - Commercial Ventilator - Motorized w/Exhaust
Power Return
V - Commercial Ventilator - Motorized w/Exhaust
Spring Return
E - Economizer - Fully Modulating 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
QT EC Series General Information

Manual 2100-380
Page 3
ELECTRICALSPECIFICATIONS Continued onPage4 TABLE2A
Q
R
S
T
U
Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.
These “Minimum Circuit Ampacity”values are to be used for sizing the field power conductors. Refer to the National Electric Code
(latest revision), article 310 for power conductor sizing. CAUTION: When more than one field power conductor circuit is run
through one conduit, the conductors must be derated. Pay special attention to Note 8 of Table 310 regarding Ampacity
Adjustment Factors when more than three conductors are in a raceway.
Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.
TABLE 2
ELECTRICALSPECIFICATIONS
SLEDOM
DETAR &STLOV SESAHP
TIUCRICELGNISTIUCRICLAUD
.ON DLEIF REWOP STIUCRIC
l
MUMINIM TIUCRIC YTICAPMA
j
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
k
DLEIF REWOP ERIW EZIS
k
DNUORG ERIW EZIS
l
MUMINIM TIUCRIC YTICAPMA
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
k
DLEIF REWOP EZISERIW
k
DNUORG EZISERIW
TKCATKCBTKCATKCBTKCATKCBTKCATKCB
Z0AD242HQ 50AD 01AD 1-802/032 1
12RO1
227427 030508 01
8
4
0101
8
----22 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0BD242HQ 60BD 90BD 3-802/032 1
1
1
715344 025354 21
8
8
210101 ------ ------ ------ ------ ------ ------ ------ ------
Z0CD242HQ 60CD 90CD 3-064 1
1
1
8
7122
510252 412101 412101 ------ ------ ------ ------ ------ ------ ------ ------
Z0AD203HQ 50AD 01AD 1-802/032 1
12RO1
429447 530508 8
8
4
0101
8
----42 ----05 ----03 ----05 ----01 ----
8
----01 ----01
Z0BD203HQ 60BD 90BD 21BD
3-802/032
1
1
1
1
81635445 52045406 01
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD203HQ 60CD 90CD 21CD
3-064
1
1
1
1
9
813272
51025203 412101
8
41210101 -------- -------- -------- -------- -------- -------- -------- --------
Z0AD263HQ 50AD 01AD
m 51AD
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
Z0BD263HQ 60BD 90BD
n 51BD
3-802/032
1
1
1
1
32140525 03540506 01
8
8
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD263HQ 60CD 90CD
n 51CD
3-064
1
1
1
1
11024262 51020303 41010101 41010101 -------- -------- -------- -------- -------- -------- -------- --------

Manual 2100-380
Page 4
TABLE2A
ELECTRICALSPECIFICATIONS
(continuedfromPage3)
Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.
Based on 75° C copper wire. All wiring must conform to the National Electrical Code and all local codes.
These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electric
Code (latest revision), article 310 for power conductor sizing. CAUTION: When more than one field power conductor
circuit is run through one conduit, the conductors must be derated. Pay special attention to Note 8 of Table 310 regarding
Ampacity Adjustment Factors when more than three conductors are in a raceway.
Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.
Q
R
S
T
U
LEDOM
DETAR &STLOV ESAHP
TIUCRICELGNISTIUCRICLAUD
.ON DLEIF REWOP STIUCRIC
l
MUMINIM TIUCRIC YTICAPMA
j
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
k
DLEIF REWOP ERIW EZIS
k
DNUORG ERIW EZIS
l
MUMINIM TIUCRIC YTICAPMA
j
MUMIXAM LANRETXE ROESUF TIUCRIC REKAERB
k
DLEIF REWOP EZISERIW
k
DNUORG EZISERIW
TKCATKCBTKCATKCBTKCATKCBTKCATKCB
Z0AD224HQ 50AD 01AD
m 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
Z0BD224HQ 60BD 90BD
n 51BD
3-802/032
1
1
1
1
42342525 03540506 01
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD224HQ 60CD 90CD
n 51CD
3-064
1
1
1
1
61520303 02520303 21010101 21010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0AD284HQ 50AD 01AD
m 51AD
1-802/032
1
12RO1 2RO1
63166868 0607 001 001 8
6
3
3
01
8
6
6
--636363 --520505 --060606 --520505 --
8
8
8
--01
8
8
--010101 --010101
Z0BD284HQ 50BD 01BD
n 51BD
3-802/032
1
1
1
1
62443535 04050606 8
8
6
6
01010101 -------- -------- -------- -------- -------- -------- -------- --------
Z0CD284HQ 60CD 90CD
n 51CD
3-064
1
1
1
1
41327272 51520303 41010101 41010101 -------- -------- -------- -------- -------- -------- -------- --------

Manual 2100-380 Page 5
FIGURE 1
UNITDIMENSIONS
MIS-1572

Manual 2100-380
Page 6
SHIPPINGDAMAGE
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
REMOVALOF UNITFROMSKID
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
FIGURE2
AIRSEALUNDER QT
EC UNIT
MIS-1008
Air Seal

Manual 2100-380
Page 7
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.
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. 4-1/2 in. This provides enough
clearance to install the duct work. See Figure 6.
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 1 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.
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.
FIGURE 4
UNITONAPPLIANCECART
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 2100-380
Page 8
FIGURE 6
DUCTEDAPPLICATION
MIS-1574
FIGURE 5
INSTALLATIONWITHFREEBLOWPLENUM
CEILING
8 FT. - 6 IN.
MINIMUM RECOMMENDED
CEILING HEIGHT
8 FT. - 4 IN.
FLOOR
MIS-1573
SUSPENDED
CEILING FIXED CEILING DUCT
DUCT FLANGE
8 FT. - 7 IN.
MINIMUMRECOMMENDED
CEILING HEIGHT
7 FT. - 2 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 2100-380
Page 9
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.
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.
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.
FIGURE 7
SUPPLYDUCTCONNECTIONS
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 2100-380
Page 10
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.
CONDENSATEDRAIN
There are two drain connections on the unit. The side
drain is located on the bottom right side of the unit.
The rear drain is an optional drain, and is located on the
right lower rear panel of the unit. The rear 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.
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. When the
rear drain is used, the plug must be removed and
installed in the side drain. 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.
FIGURE 9
SIDEDRAIN(SIDEVIEW)
QTEC UNIT
MIS-976
FIGURE 10
OPTIONALREARDRAIN
PLUG SIDE DRAIN
MIS-975

Manual 2100-380
Page 11
MIS-1061
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
UNITMOUNTING
BOTTOM
TRIM PIECE BOTTOM TRIM
EXTENSION
MOUNTING
BRACKET
SIDE TRIM
(2 PCS.)
SIDE TRIM
(2 PCS.)
MIS-1576
CABINET
SIDEPANEL
ENLARGED VIEW OF MOUNTING
BRACKET SHOWING SLEEVE TO
CABINET ATTACHMENT
MOUNTINGBRACKET
#8 SCREW
PROVIDED
(LIGHTCOLOR)
WALL
SLEEVE
#10HEX
HEADSCREW
PROVIDED
MIS-977
WATER TRAP
FIGURE 11
REARDRAIN (TOPVIEW)
WALL (MAXIMUM 10”
FORREARDRAIN)
COUPLINGSNOT
SHOWN BUT
RECOMMENDED
FOREASEOF
REMOVABILITY
FORSERVICE.
SLEEVE
DRAIN LINE
WALL BRACKET
UNIT

Manual 2100-380
Page 12
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 11).
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
REMOVESCREWSFROM
WHEELSBEFOREROLLING
INTOPLACE
FIGURE 13
REMOVINGLOCKINGSCREWSFROMWHEELS

Manual 2100-380
Page 13
The standard climate control option is a remote
thermostat connection terminal block. See Figure 16A
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. Compatible for use
with Energy Recovery Ventilator or Economizer.
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. Compatible for use
with Energy Recovery Ventilator or Economizer.
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
rewopdleifehttaderusaemebdluohsegatlovehT:ETON gnitarepositinuehtelihwdnatinuehtnitniopnoitcennoc .)noitidnocgnitarepoegarepmamumixam(daolllufta
MIS-1577
DEHUMIDIFICATION
CONTROL
THERMOSTAT
& HUMIDISTAT
CONTROL
ELECTRIC
HEATERS
CIRCUIT
BREAKERPANEL
&CONTROLS
INDOOR
BLOWER
REMOTE
THERMOSTAT
TERMINAL
BLOCK
SIDE FIELD WIRE
ENTRANCE
LOWER
CONTROL
PANEL
FIGURE 14
COMPONENTLOCATION

Manual 2100-380
Page 14
tatsomrehTesabbuSserutaeFtnanimoderP
810-3048 )4201N478T( 010-4048 )1621476Q( )2(looC/taeHcitamotuA noitisoPrevoegnahC
430-3048 )08-49F1( A/N looC/taeHelbamargorP cinortcelE
830-3048 )A006H( A/NtatsidimuH
240-3048 )0701G1158T( A/N looC/taeH/otuA/launaM elbammagorP-noN cinortcelE
TABLE4
WALLTHERMOSTATSANDSUBBASECOMBINATIONS
MIS-1285
THERMOSTATPLUGTERMINALS
P2 AND P4
(VIEWEDFROM PINEND)
BLOWERMOTOR
LOWVOLTAGEPLUG
(VIEWEDFROM PINEND)
FIGURE 15

Manual 2100-380 Page 15
4102-015
FIGURE 16
THERMOSTATWIRINGDIAGRAM
“E”THERMOSTATOPTION
DEHUMIDIFICATIONMODULE

Manual 2100-380
Page 16
4102-016
FIGURE 16A
REMOTETHERMOSTATWIRINGDIAGRAM
“X”THERMOSTATOPTION
DEHUMIDIFICATIONMODULE

Manual 2100-380 Page 17
FIGURE 16B
REMOTETHERMOSTATWIRINGDIAGRAM
“F”THERMOSTATOPTION
DEHUMIDIFICATIONMODULE
4102-014

Manual 2100-380
Page 18
START UP
DESCRIPTION OF STANDARD
EQUIPMENT
Solid State Electronic Heat Pump Control
Provides efficient 30 minute defrost cycle. A thermistor
sensor and speed up terminal for service along with a 10
minute defrost override are standard on the electronic
heat pump control.
High / Low Pressure Switch
Provides refrigerant circuit high pressure and loss of
charge protection. Includes lockout circuit that is
resettable from room thermostat.
Five Minute Compressor Time Delay
Provides short cycle protection for the compressor
which extends compressor life. Built into the electronic
heat pump control as standard.
Service Light
One service light indicates when service is required.
• Check System – detects high or low pressure
switch operation for compressor protection.
OPTIONAL CFM (QH362, QH422, AND
QH482 ONLY)
These units are shipped from the factory set to operate
at the optional CFM level shown in Table 9. This
provides lower operating sound levels for non-ducted,
free discharge applications. This CFM level will reduce
the system capacity performance by approximately 2%
at the same energy efficiency.
Rated CFM is required for ducted applications for
maximum performance rating. To obtain full CFM on
these models, connect jumper wire as follows:
1. Disconnect all power to the unit. Failure to do so
may result in damage to the motor.
2. Remove Return Air access panel.
3. Remove Filter Rack.
4. Unplug Service Lights and Thermostat Options.
(See Figure 3.)
5. Remove upper door.
6. Remove inner control panel cover.
7. Add pink jumper wire (provided) to terminals
5 and 6 on the terminal board.
8. Reverse steps to reassemble.
IMPORTANT INSTALLER NOTE
For improved start-up performance, wash the indoor
coil with a dishwasher detergent.
PHASE MONITOR
All units with three phase scroll compressors are
equipped with a 3 phase line monitor to prevent
compressor damage due to phase reversal.
The phase monitor in this unit is equipped with two
LEDs. If the Y signal is present at the phase monitor
and phases are correct the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
If a fault condition occurs, reverse two of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
THREE PHASE SCROLL COMPRESSOR
START UP INFORMATION
Scroll compressors, like several other types of
compressors, will only compress in one rotational
direction. Direction of rotation is not an issue with
single phase compressors since they will always start
and run in the proper direction.
However, three phase compressors will rotate in either
direction depending upon phasing of the power. Since
there is a 50-50 chance of connecting power in such a
way as to cause rotation in the reverse direction,
verification of proper rotation must be made.
Verification of proper rotation direction is made by
observing that suction pressure drops and discharge
pressure rises when the compressor is energized.
Reverse rotation also results in an elevated sound level
over that with correct rotation, as well as, substantially
reduced current draw compared to tabulated values.
Verification of proper rotation must be made at the
time the equipment is put into service. If improper
rotation is corrected at this time there will be no
negative impact on the durability of the compressor.
However, reverse operation for oven one hour may
have a negative impact on the bearing due to oil pump
out.
NOTE: If compressor is allowed to run in reverse
rotation for several minutes the compressor’s
internal protector will trip.