Bard | QH422 | Specifications | Bard QH422 Specifications

Bard QH422 Specifications
INSTALLATION
INSTRUCTIONS
QTEC SERIES
PACKAGED HEAT PUMP
Models:
QH243
QH302
QH362
QH422
QH482
QH602
MIS-1554
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914 . . . Moving ahead, just as planned.
Manual:
Supersedes:
File:
Date:
2100-420E
2100-420D
Vol II Tab 14
06-02-04
© Copyright 2004
CONTENTS
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
Low Voltage Connections ........................................... 14
Start Up
Description of Standard Equipment ............................... 19
Optional CFM (QH361QH421and QH481 Only) ............ 19
Important Installer Note .................................................. 19
Phase Monitor ................................................................ 19
Three Phase Scroll Compressor Start Up
Information ................................................................ 19
Service Hints .................................................................. 20
Mist Eliminator Service .................................................. 20
Vent Options .................................................................. 21
Sequence of Operation .................................................. 24
Optional Climate Controls Sequence
of Operation .............................................................. 24
Pressure Service Ports .................................................. 24
Defrost Cycle ................................................................. 25
Troubleshooting
Solid State Heat Pump Control Troubleshooting
Procedure ...................................................................... 27
Checking Temperature Sensor ...................................... 27
Fan Blade Setting Dimensions ...................................... 28
Refrigerant Charge ........................................................ 28
Pressure Charts ...................................................... 29 - 30
Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
i
Unit Dimensions .......................................... 5
Air Seal on Bottom of Unit ........................... 6
Removal of Unit From Skid ......................... 6
Unit on Appliance Cart for Moving ............... 7
Installation With Free Blow Plenum ............ 8
Ducted Application ....................................... 8
Supply Duct Connections ............................ 9
Filter Location .............................................. 9
Side Drain .................................................. 10
Optional Rear Drain ................................... 10
Rear Drain (Top View) ............................... 11
Unit Mounting ............................................ 11
Screws in Wheels of Unit .......................... 12
Component Location ................................. 13
Thermostat Plug Terminals ........................ 15
Thermostat Wiring Diagram "X" Option .... 16
Thermostat Wiring Diagram "A" Option .... 17
Thermostat Wiring Diagram "D" Option ... 18
Fresh Air Damper Removal ....................... 22
QERV Removal ......................................... 23
Heat Pump Control Board ......................... 24
Low Pressue Control Bypass Timer ........... 25
Fan Blade Setting ...................................... 28
Tables
Table 1
Table 2
Table 2A
Table 3
Table 4
Factory Built-In Electric Heat Table .............. 2
Electrical Specifications ................................ 3
Electrical Specifications ................................ 4
Operating Voltage Range ........................... 13
Wall Thermostats and Subbase
Combinations .............................................. 15
Table 5 Troubleshooting .......................................... 26
Table 6 Temperature vs Resistance of
Temperature Sensor ................................... 27
Table 7 Fan Blade Dimensions ............................... 28
Table 8 Super Heat at Compressor ......................... 28
Table 9 Indoor Blower Performance ........................ 28
Table 10 Cooling Pressure ........................................ 29
Table 11 Heating Pressure ........................................ 30
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.
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA
Air Conditioning Contractors of America
1712 New Hampshire Avenue
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI
American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
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
ASHRAE American Society of Heating, Refrigeration,
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400
Fax: (404) 321-5478
NFPA
National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: (800) 344-3555
Fax: (617) 984-7057
Manual 2100-420
Page 1
QTEC Series General Information
QTEC MODEL NOMENCLATURE
QH
36
2 – A
MODEL NUMBER |
QH - QTEC Model
CAPACITY |
24 - 2 Ton
30 - 2-1/2 Ton
36 - 3 Ton
42 - 3-1/2 Ton
48 - 4 Ton
60 - 5 Ton
REVISION |
SPECIAL UNITS |
L - Low Ampacity Circuit
VOLTS & PHASE |
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
10
X
KW
0Z - 0KW
05 - 5KW
06 - 6KW
09 - 9KW
10 - 10KW
12 - 12KW
15 - 15KW
X
X
X
FILTER OPTIONS
X - 1 Inch Fiberglass
(Standard)
F - 2 Inch Fiberglass
P - 2 Inch Pleated
X
COIL OPTIONS
X - Standard
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
COLOR OPTIONS
V - Platinum w/Slate
Front (Vinyl)
4 - Gray paint
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
X
CLIMATE CONTROL OPTIONS
X - None
A - Electronic/Non Prog/Man C/O
D - Electronic/Prog/Man/Auto
TABLE 1
FACTORY BUILT-IN ELECTRIC HEAT TABLE
Models
QH243-A
QH302-A
QH362-C
QH422-C
QH482-C
QH602-C
QH302-C
240V-1 208V-1 240V-1 208V-1 240V-1 208V-1
480V-3
480V-3
240V-1 208V-1 240V-1 208V-1
480V-3
KW
B TU H
B TU H
B TU H
B TU H
5.0
16,380 12,290
B TU H
B TU H
QH302-B
QH362-B
QH422-B
QH482-B
QH602-B
QH243-C
B TU H
QH243-B
QH362-A
QH422-A
QH482-A
QH602-A
B TU H
B TU H
B TU H
B TU H
B TU H
B TU H
16,380 12,290
6.0
20,500
15,360
20,500
20,500
20,500
15,360
20,500
9.0
30,700 23,000 30,700 23,000
30,700
30,700
30,700 23,000
30,700
10.0
15,360 20,500
32,670 24,570
12.0
15.0
Manual 2100-420
Page 2
32,670 24,570
41,000
30,700
41,000
49,150
36,860 49,150
36,860
49,150
TABLE 2
ELECTRICAL SPECIFICATIONS
SINGLE CIRCUIT
3
MODELS
RATED
VOLTS &
PHASES
1
DUAL CIRCUIT
2
3
2
2
1
MINIMUM
MAXIMUM
CIRCUIT
EXTERNAL FIELD
AMPACITY
NO.
FUSE OR POWER GROUND
MINIMUM
FIELD
CIRCUIT
CIRCUIT
WIRE
CKT CKT
WIRE
POWER
SIZE
A
B
SIZE
CIRCUITS AMPACITY BREAKER
2
MAXIMUM
EXTERNAL
FIELD
FUSE OR
POWER
CIRCUIT
BREAKER WIRE SIZE
CKT
A
CKT
B
GROUND
WIRE SIZE
CKT CKT CKT CKT
A
B
A
B
QH243-A0Z
-A05 230/208-1
-A10
1
1
1 OR 2
22
47
72
30
50
80
10
8
4
10
10
8
--22
--50
--30
--50
--10
--8
--10
--10
QH243-B0Z
-B06 230/208-3
-B09
1
1
1
17
35
44
20
35
45
12
8
8
12
10
10
----
----
----
----
----
----
----
----
QH243-C0Z
-C06
-C09
1
1
1
8
17
22
15
20
25
14
12
10
14
12
10
----
----
----
----
----
----
----
----
QH302-A0Z
-A05 230/208-1
-A10
1
1
1 OR 2
24
49
74
35
50
80
8
8
4
10
10
8
--24
--50
--30
--50
--10
--8
--10
--10
QH302-B0Z
-B06
230/208-3
-B09
-B12
1
1
1
1
18
36
45
54
25
40
45
60
10
8
6
6
10
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH302-C0Z
-C06
-C09
-C12
1
1
1
1
9
18
23
27
15
20
25
30
14
12
10
8
14
12
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH362-A0Z
-A05
230/208-3
-A10
4 -A15
1
1
1 OR 2
1 OR 2
29
54
79
82
45
60
90
90
8
6
4
4
10
10
8
8
--29
32
--50
50
--40
40
--50
50
--8
8
--8
8
--10
10
--10
10
QH362-B0Z
-B06
230/208-3
-B09
5 -B15
1
1
1
1
23
41
50
52
30
45
50
60
10
8
8
6
10
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH362-C0Z
-C06
-C09
5 -C15
1
1
1
1
11
20
24
26
15
20
30
30
14
10
10
10
14
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
460-3
460-3
460-3
! 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.
ELECTRICAL SPECIFICATIONS CONTINUED ON PAGE 4 TABLE 2A
Manual 2100-420
Page 3
TABLE 2A
ELECTRICAL SPECIFICATIONS
(Continued)
SINGLE CIRCUIT
3
MODEL
RATED
VOLTS &
PHASE
1
DUAL CIRCUIT
2
MAXIMUM
NO.
EXTERNAL FIELD
MINIMUM
FIELD
FUSE OR POWER
CIRCUIT
POWER
WIRE
CIRCUIT
CIRCUITS AMPACITY BREAKER
SIZE
2
GROUND
WIRE
SIZE
3
1
2
2
MINIMUM
CIRCUIT
AMPACITY
MAXIMUM
EXTERNAL
FUSE OR
CIRCUIT
BREAKER
FIELD
POWER
WIRE SIZE
GROUND
WIRE SIZE
CKT CKT
A
B
CKT
A
CKT
B
CKT
A
CKT
B
CKT
A
CKT
B
QH422-A0Z
-A05
230/208-1
-A10
4 -A15
1
1
1 OR 2
1 OR 2
33
58
83
83
50
60
90
90
8
6
4
4
10
10
8
8
--33
33
--50
50
--40
40
--50
50
--8
8
--8
8
--10
10
--10
10
QH422-B0Z
-B06
230/208-3
-B09
5 -B15
1
1
1
1
24
43
52
52
30
45
50
60
10
8
6
6
10
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH422-C0Z
-C06
-C09
5 -C15
1
1
1
1
16
25
30
30
20
25
30
30
12
10
10
10
12
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH482-A0Z
-A05
230/208-1
-A10
4 -A15
1
1
1 OR 2
1 OR 2
36
61
86
86
60
70
100
100
8
6
3
3
10
8
6
6
-36
36
36
-25
50
50
-60
60
60
-25
50
50
-8
8
8
-10
8
8
-10
10
10
-10
10
10
QH482-B0Z
-B06
230/208-3
-B09
5 -B15
1
1
1
1
26
44
53
53
40
50
60
60
8
8
6
6
10
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH482-C0Z
-C06
-C09
5 -C15
1
1
1
1
14
23
27
27
15
25
30
30
14
10
10
10
14
10
10
10
-----
-----
-----
-----
-----
-----
-----
-----
QH602-A0Z
-A05
230/208-1
-A10
4 -A15
1
1 or 2
1 or 2
1 or 2
45
70
95
95
60
90
110
110
8
6
2
2
10
8
6
6
-45
45
45
-25
50
50
-60
60
60
-25
50
50
-8
8
8
-10
8
8
-10
10
10
-10
10
10
QH602-B0Z
-B09 230/208-3
5 -B15
1
1
1
34
60
60
45
70
70
8
6
6
10
10
10
----
----
----
----
----
----
----
----
QH602-C0Z
-C09
5 -C15
1
1
1
17
30
30
25
35
35
10
8
8
10
10
10
----
----
----
----
----
----
----
----
!
"
#
$
%
460-3
460-3
460-3
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.
Manual 2100-420
Page 4
Manual 2100-420
Page 5
FIGURE 1
UNIT DIMENSIONS
FIGURE 2
AIR SEAL UNDER QTEC UNIT
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
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.
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
Air Seal
MIS-1008
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.
FIGURE 3
REMOVAL OF UNIT FROM SKID
Hold Skid Down
A Shipping Brackets
Manual 2100-420
Page 6
B Front Wheels Over Edge
C Front Wheels On Floor
MIS-1007
HANDLING UNIT AFTER REMOVAL
FROM SKID
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.
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.
FIGURE 4
UNIT ON APPLIANCE CART
QTEC UNIT While these instructions are intended as a general
(Right Side)
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.
STRAP
APPLIANCE
CART
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.
COMPRESSOR
MIS-1555
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.
Manual 2100-420
Page 7
FIGURE 5
INSTALLATION WITH FREE BLOW PLENUM
CEILING
8 FT. - 6 IN.
MINIMUM RECOMMENDED
CEILING HEIGHT
8 FT. - 5 IN.
MIS-1574
FLOOR
FIGURE 6
DUCTED APPLICATION
20 IN.
MINIMUM
SUSPENDED
CEILING
FIXED CEILING
DUCT
DUCT FLANGE
12 IN.
MINIMUM
2 IN. MINIMUM
FROM DUCT FLANGE
TO DUCT BOTTOM
7 FT. - 4 IN.
UNIT HEIGHT
8 FT. - 7 IN.
MINIMUM RECOMMENDED
CEILING HEIGHT
8 FT. - 4.5 IN.
MINIMUM REQUIRED
INSTALLATION HEIGHT
FLOOR
Manual 2100-420
Page 8
MIS-1573
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 QTEC 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.
FIGURE 7
SUPPLY DUCT CONNECTIONS
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 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.
SUPPLY DUCT
TO BE FIELD
SUPPLIED
FIGURE 8
FILTER LOCATION
ATTACHMENT
SCREWS TO
BE FIELD
SUPPLIED
FILTERS
ROOM SIDE OF
QTEC UNIT
MIS-978
DUCT FLANGE
PROVIDED WITH
UNIT
NOTE: Unit cabinet, supply air duct and free blow
plenum are approved for “0” clearance to
combustible material.
The QTEC 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.
RETURN AIR
GRILLE
MIS-1575
Manual 2100-420
Page 9
FRESH AIR INTAKE
CONDENSATE DRAIN
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.
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.
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.
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.
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
SIDE DRAIN (SIDE VIEW)
FIGURE 10
OPTIONAL REAR DRAIN
PLUG SIDE DRAIN
QTEC UNIT
MIS-975
Manual 2100-420
Page 10
SERVICE LIGHT
FIGURE 11
REAR DRAIN (TOP VIEW)
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.
DRAIN LINE
WALL (MAXIMUM 10”
FOR REAR DRAIN)
SLEEVE
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.
COUPLINGS NOT
SHOWN BUT
RECOMMENDED
FOR EASE OF
REMOVABILITY
FOR SERVICE.
WALL BRACKET
WATER TRAP
UNIT
MIS-977
FIGURE 12
UNIT MOUNTING
SIDE TRIM
(2 PCS.)
SIDE TRIM
(2 PCS.)
ENLARGED VIEW OF MOUNTING
BRACKET SHOWING SLEEVE TO
CABINET ATTACHMENT
MOUNTING BRACKET
WALL
SLEEVE
#8 SCREW
PROVIDED
(LIGHT COLOR)
MOUNTING
BRACKET
CABINET
SIDE PANEL
#10 HEX
HEAD SCREW
PROVIDED
MIS-1576
BOTTOM
TRIM PIECE
MIS-1061
BOTTOM TRIM
EXTENSION
Manual 2100-420
Page 11
INSTALLATION INSTRUCTIONS
MOUNTING THE UNIT
When installing a QTEC unit near an interior wall on the
left side, a minimum of 8 inches is required; 12 inches is
preferred.
When installing a QTEC 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 QTEC, 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.
FIGURE 13
REMOVING LOCKING SCREWS FROM WHEELS
REMOVE SCREWS
FROM WHEELS
BEFORE ROLLING
INTO PLACE
Manual 2100-420
Page 12
MIS-1018
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
UNIT
MOUNTED
THERMOSTAT
LOCATION
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
OPERATING VOLTAGE RANGE
TAP
RANGE
240V
253 – 216
208V
220 – 187
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).
FIGURE 14
COMPONENT LOCATION
ELECTRIC
HEATERS
there will be no nuisance tripping due to the momentary
high starting current of the compressor motor.
SIDE FIELD WIRE
ENTRANCE
REMOTE
THERMOSTAT
TERMINAL
BLOCK
INDOOR
BLOWER
DEHUMIDIFICATION
CONTROL
(OPTIONAL)
CIRCUIT
BREAKER PANEL
& CONTROLS
LOWER
CONTROL
PANEL
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, nonprogrammable 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 CS2000
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 CS2000 (or other field
provided means to control ventilation) must be
used if any of the motorized ventilation options
are installed.
MIS-1577
Manual 2100-420
Page 13
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.
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.
LOW VOLT AGE CONNECT IONS FOR
DDC CONT ROL
Fan Only
Energize G
Cooling Mode
Energize Y, G
Heat Pump Heating
Energize Y, G, B
2nd Stage Heating
(if employed)
Energize G, W2
Ventilation
Energize G, O1
Emergency Heat
Energize B, W2, E
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 2100-420
Page 14
TABLE 4
WALL THERMOSTATS AND SUBBASE COMBINATIONS
Thermostat
S u b b ase
Predominant Features
8407-017
(T874R1129)
8404-009 Heat or Cool
(Q674L1181) No Auto
8403-018
(T874N2024)
8404-010 Automatic Heat / Cool
(Q6741261) Changeover Position
8403-049
(1F93-380)
N/A
Manual / Auto / Heat / Cool
Programmable
8403-042
(T8511G1070)
N/A
Manual / Auto / Heat / Cool
Non-Programmable Electronic
FIGURE 15
THERMOSTAT PLUG TERMINALS
P2 AND P4
(VIEWED FROM PIN END)
BLOWER MOTOR
LOW VOLTAGE PLUG
(VIEWED FROM PIN END)
MIS-1285
Manual 2100-420
Page 15
FIGURE 16
REMOTE THERMOSTAT WIRING DIAGRAM
“X” THERMOSTAT OPTION
24VAC HOT
COMPRESSOR
REVERSING VALVE
2ND STAGE HEAT
BLOWER
EMERGENCY HEAT
24VAC COMMON
VENTILATOR OR DAMPER
NOTE: On option X or A the CS2000 (or other field
provided means to control ventilation) must be
used if any of the motorized ventilation options
are installed.
Manual 2100-420
Page 16
FIGURE 17
UNIT MOUNTED THERMOSTAT WIRING DIAGRAM
“A” THERMOSTAT OPTION
NOTE: On option X or A the CS2000 (or other field
provided means to control ventilation) must be used
if any of the motorized ventilation options are
installed.
4102-021A
Manual 2100-420
Page 17
FIGURE 18
UNIT MOUNTED THERMOSTAT WIRING DIAGRAM
“D” THERMOSTAT OPTION
4102-022C
Manual 2100-420
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 Lights
One service light indicates when service is required.
• Check System – detects high or low pressure
switch operation for compressor protection.
OPTIONAL CFM (QH362, QH422, QH482
AND QH602 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. Open return air service panel
3. Open inner control panel cover
4. Locate low voltage terminal strip. There is a pink
jumper wire with both ends attached to terminal
marked “G2”. Move one end of this jumper to
terminal “Y”.
5. 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 and the
compressor contactor is allowed to energize.
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.
All three phase scroll compressors used in the QTEC
series are wired identically internally. As a result, once
the correct phasing is determined for a specific system
or installation, connecting properly phased power leads
to the same Fusite terminal should maintain proper
rotation direction. The direction of rotation of the motor
may be changed by reversing any two line connections
to the unit.
Manual 2100-420
Page 19
SERVICE HINTS
1. Caution user to maintain clean air filters at all
times. Also, not to needlessly close off supply air
registers. This may reduce air flow through the
system, which shortens equipment service life as
well as increasing operating costs and noise
levels.
2. Switching to heating cycle at 75°F or higher
outside temperature may cause a nuisance trip of
the remote reset high pressure switch. Turn
thermostat off, then on to reset the high pressure
switch.
3. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode
before trying to diagnose any reported service
problems.
4. Check all power fuses or circuit breakers to be
sure they are the correct rating.
5. Periodic cleaning of the outdoor coil to permit
full and unrestricted airflow circulation is
essential.
6. Some service requires the need to remove the unit
from the wall including replacement of the indoor
coil and/or the outdoor coil. Also servicing the
outdoor fan motor or fan blade will require
removing the unit from the wall if the unit is
installed at a height that is not easily accessible
from the outside of the building.
In order to remove the unit from the wall the
following procedure must be used:
a. Turn off power to the unit at the remote
location. Some units may have more than one
power supply.
b. Disconnect field wiring at unit terminal block
and remove from unit.
c. Disconnect condensate drain.
d. Remove the lower skirting around the unit.
e. Remove wall mounting brackets from wall on
each side of the unit.
f. If unit is attached to duct work, remove upper
cabinet extension by removing the top center
screw only from the cabinet side panel.
Manual 2100-420
Page 20
g. Remove screws that attach the duct work to
the unit flanges.
This unit is equipped with four rollers
mounted to the base. For ease of pulling unit
out from the wall, you may want to remove
the bottom service door which requires
removal of the return air panel, and grip the
front flange of the base pan then pull straight
out.
7. Annual maintenance is required to make sure that
all of the systems are functioning properly.
a. Check to make sure that the drains are not
obstructed in any way.
b. Remove any debris in the condenser section of
the unit.
c. Inspect and clean mist eliminator as described
below.
d. Inspect and wash outdoor coil as necessary.
MIST ELIMINATOR SERVICE
A mist eliminator is supplied with the wall sleeve. The
mist eliminator is constructed of an aluminum frame
and mesh. The mist eliminator is located in the top
section of the wall sleeve and can be removed from the
inside of the building without removing the unit from
the wall. This requires that the ventilation package must
be removed.
It is recommended that the mist eliminator be inspected
annually and serviced as required. The mist eliminator
can be inspected from the outside of the building by
looking through the outdoor grille. The mist eliminator
can be serviced from the outside by using a vacuum
cleaner. The outdoor grille must be removed. Use the
vacuum to remove dirt and debris from the surface of
the mist eliminator. If additional cleaning is required,
the mist eliminator will have to be removed from the
sleeve.
The ventilation package will have to be removed to gain
access tot he mist eliminator. If the blank off plate
option is used, it is not necessary to service the mist
eliminator. The steps necessary to remove each of the
vent options are listed on the following pages.
The mist eliminator can be cleaned by washing with
soap and water. The excess water should be shaken off
the mist eliminator before it is reinstalled.
VENT OPTIONS
QTEC R ENERGY RECOVERY VENTILATOR
(Option)
BAROMETRIC FRESH AIR DAMPER
(Standard)
Before starting, make sure that the power has been
turned off. The return air grille panel must be removed.
The energy recovery ventilator (QERV) can be seen
after the panel has been removed. To gain access to the
mist eliminator, the QERV must be removed. See
Figure 20.
Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
fresh air damper assembly can be seen on the back of
the unit. See Figure 19.
1. The fresh air damper is attached to the back of
the unit with one screw on either side of the
assembly. Both of the screws must be removed.
1. The front fill plate of the QERV must be removed.
There is one screw on either side of the plate.
Remove these screws and remove the plate.
2. Once the mounting screws are removed, tilt the
assembly down and lift it out.
2. On either side of the QERV there are mounting
screws that hold the QERV in place. Remove
both of these screws.
The mist eliminator can be seen through the opening.
The mist eliminator must be raised up and the bottom
can be pulled toward the front of the unit.
COMMERCIAL ROOM VENTILATOR (Option)
Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
commercial room ventilator (CRV) can be seen after
the panel has been removed. The CRV must be
removed to gain access to the mist eliminator.
1. The two mounting screws in the front of the
CRV must be removed.
2. The power connectors for the CRV (located on
the right side of the unit) must be disconnected.
Squeeze the tabs on the sides of the connector
and pull straight out. Unplug both of the
connectors.
3. Slide the CRV straight out of the unit.
3. Underneath the heat recovery cassette there is a
power connector for the lower blower assembly.
To disconnect this plug, the tabs on both sides of
the plug must be squeezed to release the plug.
While squeezing the tabs, pull the plug out of the
socket.
4. The QERV is plugged into the unit in the right side
of the unit. Both of these plugs must be
disconnected to remove the QERV. Squeeze the
tabs on the sides of the connector and pull
straight out.
5. Slide the QERV assembly straight out of the unit,
being careful not to let the cassette slide out of
the QERV.
The mist eliminator can be seen through the opening in
the back of the unit. The mist eliminator must be raised
up and the bottom can be pulled toward the front of the
unit and removed.
The mist eliminator can be seen through the opening in
the back of the unit. The mist eliminator must be raised
up and the bottom can be pulled toward the front of the
unit and removed.
Manual 2100-420
Page 21
FIGURE 19
FRESH AIR DAMPER REMOVAL
MOUNTING SCREW
MIS-1627
Manual 2100-420
Page 22
FIGURE 20
QERV REMOVAL
POWER
CONNECTORS
MOUNTING SCREWS
LOWER BLOWER
ASSEMBLY POWER
CONNECTOR
FRONT FILL
MIS-1039
Manual 2100-420
Page 23
SEQUENCE OF OPERATION
Cooling – Circuit R-Y makes the thermostat pull in the
compressor contactor starting the compressor and
outdoor motor. The G (indoor motor) circuit is
automatically completed on any call for cooling
operation, or can be energized by manual fan switch on
subbase for constant air circulation.
Heating – A 24V solenoid coil on reversing valve
controls heating cycle operation. Two thermostat
options, one allowing “Auto” change over from cycle to
cycle and the other constantly energizing solenoid coil
during heating season and thus eliminating pressure
equalization noise except during defrost, are to be used
on “Auto” option, a circuit is completed for R-W1 and
R-Y on each heating “on” cycle, energizing reversing
valve solenoid and pulling in compressor contactor
starting compressor and outdoor motor. R-G also makes
starting indoor blower motor. Heat pump heating cycle
now in operation.
The second option has no “Auto” change over position,
but instead energizes the reversing valve solenoid
constantly whenever the system switch on subbase is
placed in “Heat” position, the “B” terminal being
constantly energized from R. A thermostat demand for
heat completes R-Y circuit, pulling in compressor
contactor starting compressor and outdoor motor. R-G
also make starting indoor blower motor.
High / Low Pressure control provides protection for the
compressor. In the advent system pressures go above
450 PSI or below 3.5 PSI in either cooling or heating
mode the compressor will be stopped. This will activate
the red light located in the control panel. The lockout
circuit will hold compressor off line. When the system
problem is corrected, the unit operation can be restored
by turning of the main power supply off and then back
on, or reset the room thermostat. The low pressure
control has a bypass to eliminate nuisance lockout on
cold start up.
The bypas timer should be set to 200 seconds, and this is
to assure there is no nuisance tripping of the lowpressure control during startup in heating mode under
cold weather conditions. See Figure 22.
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
The Climate Control Option A is an electronic, nonprogrammable manual or auto changeover thermostat.
The thermostat may be manually set to heat or cool
mode. The thermostat will maintain the temperature set
on the thermostat in the mode in which it is set.
The Climate Control Option D is an electronic,
programmable thermostat. The thermostat can be set in
the heat, cool or automatic mode. When the thermostat
is sent in the heat mode, it can heat only to maintain the
temperature set on the thermostat. When the thermostat
is set in the cool mode, it can cool only to maintain the
temperature set on the thermostat. When the thermostat
is set in the automatic mode, the thermostat can change
automatically to the heat or cool modes to maintain the
temperature set on the thermostat.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on all
units so that the system operating pressures can be
observed. Pressure curves can be found later in the
manual covering all models on both cooling and heating
cycles. It is imperative to match the correct pressure
curve to the unit by model number. Upper and lower
service doors must be attached to obtain proper reading.
FIGURE 21
HEAT PUMP CONTROL BOARD (HPC)
MIS-973
Manual 2100-420
Page 24
DEFROST CYCLE
The defrost cycle is controlled by temperature and time
on the solid state heat pump control. (Refer to Figure
19.)
When the outdoor temperature is in the lower 40° F
temperature range or colder, the outdoor coil
temperature is 32° F or below. This coil temperature is
sensed by the coil sensor mounted near the bottom of
the outdoor coil. Once coil temperature reaches 30° F
or below, the coil sends a signal to the control logic of
the heat pump control and the defrost timer will start.
After 30 minutes at 30° F or below, the heat pump
control will place the system in the defrost mode.
During the defrost mode the refrigerant cycle switches
back to the cooling cycle, the outdoor motor stops,
electric heaters are energized, and hot gas passing
through the outdoor coil melts any accumulated frost.
When the temperature rises to approximately 57° F, the
coil sensor will send a signal to the heat pump control
which will return the system to heating operations
automatically.
If some abnormal or temporary condition such as a high
wind causes the heat pump to have a prolonged defrost
cycle, the heat pump control will restore the system to
heating operation automatically after 10 minutes.
There are three settings on the heat pump control – 30
minute, 60 minute and 90 minute. Models are shipped
wired on the 30 minute setting for greatest operating
economy. If special circumstances require a change to
another time, remove wire connected to terminal 30 and
reconnect to desired terminal. Refer to Figure 21. The
manufacturer’s recommendation is for 30 minute defrost
cycles.
There is a cycle speed up jumper on the control. This
can be used to reduce the time between defrost cycle
operation without waiting for time to elapse.
FIGURE 22
LOW PRESSURE CONTROL BYPASS TIMER
Use a small screwdriver or other metallic object, or
another 1/4 inch QC, to short between the SPEEDUP
terminals to accelerate the HPC timer and initiate
defrost. Be careful not to touch any other terminals with
the instrument used to short the SPEEDUP terminals. It
may take up to 10 seconds with the SPEEDUP terminals
shorted for the speedup to be completed and the defrost
cycle to start.
As soon as the defrost cycle kicks in remove the
shorting instrument from the SPEEDUP terminal.
Otherwise the timing will remain accelerated and run
through the 1- minute maximum defrost length sequence
in a matter of seconds and will automatically terminate
the defrost sequence.
There is an initial defrost jumper (sen jmp) on the
control that can be used at any outdoor ambient during
the heating cycle to simulate a 0° coil temperature. This
can be used to check defrost operation of the unit
without waiting for the outdoor ambient to fall into the
defrost region.
By placing a jumper across the SEN JMP terminals (a
1/4 inch QC terminal works best) the defrost sensor
mounted on the outdoor coil is shunted out and will
activate the timing circuit. This permits the defrost
cycle to be checked out in warmer weather conditions
without the outdoor temperature having to fall into the
defrost region.
In order to terminate the defrost test the SEN JMP
jumper must be removed. If left in place too long the
compressor could stop due to the high pressure control
opening because of high pressure condition created by
operating in the cooling mode with outdoor fan off.
Pressure will rise fairly fast as there is likely no actual
frost on the outdoor coil in this artificial test condition.
There is also a 5 minute compressor time delay function
built into the HPC. This is to protect the compressor
from short cycling conditions. In some instances it is
helpful to the service technician to override or speed up
this timing period, and shorting out the SPEEDUP
terminals for a few seconds can do this.
MIS-1917
Manual 2100-420
Page 25
TROUBLESHOOTING
TABLE 5
TROUBLESHOOTING
Sympton
Compressor
contactor does not
energize
(cooling or heating)
Fan outdoor motor
does not run
(cooling or heating
except during
defrost)
Reversing valve
does not energize
(heating only)
Unit will not go into
defrost
(heating only)
Unit will not come
out of defrost
(heating only)
Manual 2100-420
Page 26
Possible Cause
What to Check
How to Check or Repair
Control circuit wiring
Check for R connection at unit, and Run R connection to outdoor unit to
24V between R-C.
power heat pump control.
Compressor lock out
1) Check for 24V between L1-C
on heat pump control.
1) If no voltage between L1-C turn
thermostat off and on again to reset
high pressure switch.
2) Check across high pressure
switch.
2) If high pressure switch is open and
will not reset, replace high pressure
switch.
Compressor short cycle
protection
Check for 24V between CC-C and If no voltage between CC-C jumper
Y-C on heat pump control.
speed up terminal and within 10
seconds power should appear between
CC-C. Remove speed up jumper after
10 seconds.
Heat pump control
defective
Check all other possible causes.
Manual 2100-034
Replace heat pump control.
Contactor defective
Check for open or shorted coil
winding.
Replace contactor.
Motor defective
Check for open or shorted motor
winding.
Replace motor.
Motor capacitor
defective
Check capacitor rating. Check for Replace capacitor.
open or shorted capacitor.
Heat pump control
defective
Check across fan relay on heat
pump control
(Com-NC)
Replace heat pump control.
460V models only –
outdoor motor relay
defective
Check relay for 24V to relay coil
when compressor contactor is
energized, and that contacts are
closing properly.
Replace relay.
Reversing valve solenoid Check for open or shorted coil.
coil defective
Replace solenoid coil.
Heat pump control
defective
Check for 24V between
RV-C and B-C.
1) Check control circuit wiring.
2) Replace heat pump control
Temperature sensor or
heat pump control
defective
Disconnect temperature sensor
from board, and jumper across
speed up terminals and sen jmp
terminals. This should cause the
unit to go through a defrost cycle
within one minute.
1) If unit goes through defrost cycle,
replace temperature sensor.
Temperature sensor or
heat pump control
defective
Jumper across speed up
terminals. This should cause the
unit to come out of defrost within
one minute.
2) If unit does not go through defrost
cycle, replace heat pump control.
1) If unit comes out of defrost cycle,
replace temperature sensor.
2) If unit does not come out of defrost
cycle, replace heat pump control.
SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE
CHECKING TEMPERATURE SENSOR
1. Disconnect temperature sensor from board and
from outdoor coil.
1. Turn on AC power supply to indoor and outdoor
units.
2. Use an ohmmeter and measure the resistance of
the sensor. Also use ohmmeter to check for short
or open.
2. Turn thermostat blower switch to “fan on” – the
indoor blower should start. (If it doesn’t,
troubleshoot indoor unit and correct problem.)
3. Turn thermostat blower to “auto” position.
Indoor blower should stop.
3. Check resistance reading to chart of resistance
use sensor ambient temperature. (Tolerance of
part is ± 10%.)
4. Set system switch to “heat” or “cool”. Adjust
thermostat to call for heat or cool. The indoor
blower, compressor and outdoor fan should start.
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the
heat pump control.
NOTE: If there was no power to 24 volt transformer,
the compressor and outdoor fan motor will not
start for 5 minutes. This is because of the
compressor short cycle protection.
5. If sensor is out of tolerance, shorted, open, or
reads very low ohms then it should be replaced.
TABLE 6
TEMPERATURE (F) VS RESISTANCE (R) OF TEMPERATURE SENSOR
F
R
F
R
F
R
F
R
F
R
-25.0
-24.0
-23.0
-22.0
-21.0
-20.0
-19.0
-18.0
-17.0
-16.0
-15.0
-14.0
-13.0
-12.0
-11.0
-10.0
-9.0
-8.0
-7.0
-6.0
-5.0
196871
190099
183585
177318
171289
165487
159904
154529
149355
144374
139576
134956
130506
126219
122089
118108
114272
110575
107010
103574
100260
97064
93981
91008
88139
85371
82699
80121
77632
75230
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
72910
70670
68507
66418
64399
62449
60565
58745
56985
55284
53640
52051
50514
49028
14590
46200
44855
43554
42295
41077
39898
38757
37652
36583
35548
34545
33574
32634
31723
30840
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.0
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
29986
29157
28355
27577
26823
26082
25383
24696
24030
23384
22758
22150
21561
20989
20435
19896
19374
18867
18375
17989
17434
16984
16547
16122
15710
15310
14921
14544
14177
13820
65.0
66.0
67.0
68.0
69.0
70.0
71.0
72.0
73.0
74.0
75.0
76.0
77.0
78.0
79.0
80.0
81.0
82.0
83.0
84.0
85.0
86.0
87.0
88.0
89.0
90.0
91.0
92.0
93.0
94.0
13474
13137
12810
12492
12183
11883
11591
11307
11031
10762
10501
10247
10000
9760
8526
9299
9077
8862
8653
8449
8250
8057
7869
7686
7507
7334
7165
7000
6840
6683
95.0
96.0
97.0
98.0
99.0
100.0
101.0
102.0
103.0
104.0
105.0
106.0
107.0
108.0
109.0
110.0
111.0
112.0
113.0
114.0
115.0
116.0
117.0
118.0
119.0
120.0
121.0
122.0
123.0
124.0
6531
6383
6239
6098
5961
2827
4697
5570
5446
5326
5208
5094
4982
4873
4767
7663
4562
4464
4367
7274
4182
4093
4006
3921
3838
3757
3678
3601
3526
3452
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
Manual 2100-420
Page 27
FAN BLADE SETTING DIMENSIONS
REFRIGERANT CHARGE
Any service work requiring removal or adjustment in
the fan and/or motor area will require that the
dimensions in Table 7 be checked and blade adjusted in
or out of the motor shaft accordingly.
The correct system R-22 charge is shown on the unit
rating plate. Optimum unit cooling performance will
occur with a refrigerant charge resulting in a Super Heat
as shown in Table 8. If correct charge is in doubt,
recover the refrigerant and recharge per the charge on
the unit rating plate.
FIGURE 23
FAN BLADE SETTING
TABLE 8
SUPER HEAT AT COMPRESSOR
MODEL
MIS-983
TABLE 7
FAN BLADE DIMENSIONS
MODEL
DIMENSION A
(INCHES)
QH243
QH302
QH362
QH422
QH482
QH602
.750
.750
.750
.750
.750
.750
RATED
C FM
95°F OD
82°F OD
TEMPERATURE TEMPERATURE
QH243
800
16 - 18
14 - 16
QH302
1000
16 - 18
15 - 17
QH362
1200
16 - 18
14 - 16
QH422
1200
19 - 21
16 - 18
QH482
1400
23 - 25
22 - 24
QH602
1550
7 - 9
13 - 15
TABLE 9
INDOOR BLOWER PERFORMANCE
1
2
3
Optional
C FM
4
Continuous
C FM @
C FM
Max. ESP
Rated ESP
Max. ESP
Rated CFM
.10
0.5
800
800
700
QH302
.15
0.8
1000
1000
910
QH362
.15
0.8
1200
1000
1000
1175
QH422
.15
0.8
1200
1000
1000
1175
QH482
.15
0.8
1400
1100
1100
1175
QH602
.20
0.5
1550
1250
1250
1400
Model
QH243
5
NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjust itself to
maintain approximately the same rate of indoor air flow in both heating and cooling, dry and wet coil
conditions and at both 230/208 or 460 volts.
1
2
3
4
5
Maximum ESP (inches WC) shown is with 1” thick disposable filter (reduced by .2 for 2” filter).
Rated CFM for ducted applications – required for maximum performance rating. To obtain full CFM on models QH362, QH422,
QH482 and QH602 connect the pink jumper wire (provided) to terminal #G2 and #Y on the low voltage terminal block located in
the circuit breaker box.
Optional CFM – the unit is shipped from the factory set to operate at the optional CFM level shown. This provides lower operating
sound levels for non-ducted, free discharge applications. This reduces system capacity performance by approximately 2% at the
same energy efficiency.
Continuous fan CFM is the total air being circulated during continuous fan mode.
Models QH242 – when operating on 2nd stage heating the indoor air will increase to 1000 CFM.
Manual 2100-420
Page 28
TABLE 10
COOLING PRESSURE
(ALL TEMPERATURES IN DEGREES F)
MODEL
QH243
QH302
QH362
QH422
QH482
QH602
R E TU R N
AIR
TEMP.
PR ESSU R E
1 AIR TEMPERATURE ENTERING OUTDOOR COIL
75
80
85
90
95
100
105
110
115
75 D B
62 WB
Low S i de
High Side
73
195
73
199
74
214
76
229
77
244
79
259
80
274
81
289
83
304
80 D B
67 WB
Low S i de
High Side
78
203
78
204
79
219
80
234
82
250
84
264
85
280
87
296
88
312
85 D B
72 WB
Low S i de
High Side
84
121
84
213
85
228
86
244
88
259
89
274
91
290
93
305
94
320
75 D B
62 WB
Low S i de
High Side
75
226
75
202
76
242
77
258
78
273
79
319
80
303
81
319
82
335
80 D B
67 WB
Low S i de
High Side
80
228
80
233
81
248
82
264
83
280
84
296
85
311
86
327
87
343
85 D B
72 WB
Low S i de
High Side
86
238
86
240
87
257
88
273
89
290
90
306
91
323
92
339
93
356
75 D B
62 WB
Low S i de
High Side
74
212
74
215
75
233
76
251
77
269
78
287
79
305
80
323
81
341
80 D B
67 WB
Low S i de
High Side
79
219
79
220
80
239
81
257
82
276
83
294
84
312
85
331
86
350
85 D B
72 WB
Low S i de
High Side
85
223
85
228
86
247
87
267
88
286
89
305
90
324
91
343
92
363
75 D B
62 WB
Low S i de
High Side
71
246
71
248
72
264
73
281
74
299
75
318
76
339
77
362
79
385
80 D B
67 WB
Low S i de
High Side
75
251
76
243
77
270
78
288
79
307
80
327
81
349
82
371
83
395
85 D B
72 WB
Low S i de
High Side
82
261
82
262
83
279
84
298
85
318
86
330
87
361
88
384
90
409
75 D B
62 WB
Low S i de
High Side
69
221
71
237
72
252
72
270
73
287
74
305
75
323
75
343
76
363
80 D B
67 WB
Low S i de
High Side
75
228
76
244
76
260
77
276
78
294
79
312
80
331
80
351
81
372
85 D B
72 WB
Low S i de
High Side
81
237
82
252
82
269
83
285
84
304
85
323
86
342
86
363
87
385
75 D B
62 WB
Low S i de
High Side
69
244
70
260
71
277
72
294
73
313
74
332
75
352
76
372
77
393
80 D B
67 WB
Low S i de
High Side
74
250
75
267
76
284
77
302
78
321
79
341
80
361
81
382
82
403
85 D B
72 WB
Low S i de
High Side
77
259
78
276
79
294
80
313
81
332
82
353
83
374
84
395
85
417
Low side pressure ± 2 psig
High side pressure ± 5 psig
Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct
operating charge being in the system, the charge should be removed, system evacuated and recharged to
serial plate instructions.
!
75° F outdoor temperature condenser fan motor is running on low speed.
Manual 2100-420
Page 29
TABLE 11
HEATING PRESSURE
(ALL TEMPERATURES IN DEGREES F)
MODEL
R E TU R N
AIR
TEMP.
PR ESSU R E
AIR TEMPERATURE ENTERING OUTDOOR COIL
0
5
10
15
20
25
30
35
40
45
50
55
60
QH243
70
Low S i de
High Side
7
147
12
155
17
164
23
172
28
33
181 189
39
198
44
206
50
215
55
224
60
232
65
240
71
249
QH302
70
Low S i de
High Side
16
157
20
163
24
169
28
175
33
180
41 45
193 199
49
205
54
58
211 217
62
222
67
228
QH362
70
Low S i de
High Side
13
147
17
153
21 25
159 164
30
34
171 176
38
182
42
188
46
194
51 55
200 206
59
63
211 217
QH422
70
Low S i de
High Side
13
18
161 168
22
174
26
180
31 35
187 193
39
199
44
206
48
212
53
218
57
225
61 65
231 237
QH482
70
Low S i de
High Side
11 15
154 160
20
167
24
173
29
180
38
192
42
199
47
206
52
213
56
219
60
225
65
232
QH602
70
Low S i de
High Side
21
21 22
162 166 170
23
175
25
28
181 187
41 46
208 216
53
225
60
234
68
244
Refer to notes following Table 10
Manual 2100-420
Page 30
37
187
33
186
31 36
193 200
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