INSTALLATION INSTRUCTIONS
Q-TECTM SERIES
PACKAGED HEAT PUMP
Models:
Q24H3DA Q30H3DA Q36H3DA Q42H3DA Q48H3DA Q60H3DA
Q24H3DB Q30H3DB Q36H3DB Q42H3DB Q48H3DB Q60H3DB
Q24H3DC Q30H3DC Q36H3DC Q42H3DC Q48H3DC Q60H3DC
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual No.:
2100-653A
Supersedes:2100-653
Date:10-11-17
Page
1 of 44
CONTENTS
Getting Other Information and Publications.......... 3
Q-TEC Series General Information............................. 4
Q-TEC Model Nomenclature....................................... 4
Shipping Damage...................................................... 7
Unit Removal from Skid............................................. 7
Handling Unit After Removal from Skid....................... 8
General.................................................................... 8
Minimum Installation Height...................................... 8
Duct Work.............................................................. 10
Filters.................................................................... 10
Fresh Air Intake...................................................... 11
Service Light........................................................... 11
Condensate Drain.................................................... 11
Optional Rear Drain Kits.......................................... 11
Installation................................................................... 18
Mounting the Unit................................................... 18
Wiring – Main Power............................................... 19
Wiring – Low Voltage............................................... 19
Optional Climate Controls Sequence of Operation....... 19
Low Voltage Connections.......................................... 20
General.................................................................. 21
Start Up......................................................................... 27
R-410A Refrigerant: General.................................... 27
Topping Off System Charge...................................... 27
Safety Practices...................................................... 27
Description of Standard Equipment........................... 28
Optional CFM (Q36H3D, Q43H3D, Q48H3D
and Q60H3D Only).................................................... 28
Important Installer Note........................................... 28
Phase Monitor......................................................... 28
Three Phase Scroll Compressor Start Up Information.. 28
Service Hints.......................................................... 29
Mist Eliminator Service............................................ 29
Vent Options........................................................... 30
Sequence of Operation............................................. 33
Refrigerant Tube Schematic for Reheat Coil............... 34
Pressure Service Ports............................................. 35
Defrost Cycle.......................................................... 36
Troubleshooting.......................................................... 38
Solid State Heat Pump Control................................. 38
Checking Temperature Sensor................................... 39
Troubleshooting ECM™ Blower Motors...................... 40
Fan Blade Setting Dimensions.................................. 42
R-410A Refrigerant Charge...................................... 42
Figures
Figure 1 Unit Dimensions........................................ 6
Figure 2 Air Seal Under Q-TEC Unit.......................... 7
Figure 3 Removal of Unit from Skid.......................... 7
Figure 4 Unit on Appliance Cart............................... 8
Figure 5 Installation with Duct Free Plenum.............. 9
Figure 6 Ducted Application..................................... 9
Figure 7 Supply Duct Connections.......................... 10
Figure 8 Filter Location......................................... 10
Figure 9 Optional Side Drain (Side View)................. 12
Figure 10 Standard Rear Drain................................. 12
Figure 11 Rear Drain (Top View)............................... 12
Figure 12AOptional Rear Drain Kit............................ 13
Figure 12BOptional Rear Drain Kit............................ 14
Figure 12COptional Rear Drain Kit............................ 15
Figure 12DOptional Rear Drain Kit............................ 16
Figure 13AUnit Mounting – Method 1........................ 17
Figure 13BUnit Mounting – Method 2........................ 17
Figure 14 Removing Locking Screws from Wheels...... 18
Figure 15 Component Location................................. 19
Figure 16 Thermostat Plug Terminals........................ 21
Figure 17 Thermostat Wiring Diagram "X" Option....... 22
Figure 18 T-Stat Diagram "X" Opt. & Demand Vent......... 23
Figure 19 Thermostat Wiring Diagram "E" Option...... 24
Figure 20 T-Stat Wiring Diagram "I" Option............... 25
Figure 21 T-Stat Wiring Diagram "J or K" Opt. .......... 26
Figure 22 Fresh Air Damper Removal........................ 31
Figure 23 QERV Removal......................................... 32
Figure 24 CO2 Controller.......................................... 33
Manual2100-653A
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2 of 44
Figure
Figure
Figure
Figure
Figure
Figure
Figure
25
26
27
28
29
30
31
Q-TEC Dehum. Mode Circuit Diagram........ 34
Q-TEC Cooling Mode Circuit Diagram......... 35
Defrost Control Board............................... 37
Control Disassembly................................. 41
Winding Test............................................ 41
Drip Loop................................................ 41
Fan Blade Setting.................................... 42
Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Factory Built-In Electric Heat....................... 4
Electrical Specifications.............................. 5
Operating Voltage Range............................ 19
Wall Thermostats and Controls.................... 21
Troubleshooting......................................... 38
Temp. vs Resistance of Temp. Sensor.......... 39
Fan Blade Dimensions............................... 42
Subcooling at Liquid Line.......................... 42
Indoor Blower Performance........................ 42
Cooling Pressure....................................... 43
Heating Pressure....................................... 44
Dehum. Relay Logic Board......................... 44
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help when installing the air
conditioner or heat pump. They can usually be found
at a local library or can be purchased directly from the
publisher. Be sure to consult the most current edition
of each standard.
National Electrical Code...................... ANSI/NFPA 70
Standard for the Installation.............. ANSI/NFPA 90A
of Air Conditioning and Ventilating Systems
Standard for Warm Air....................... ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for .......................ACCA Manual J or
Winter and Summer Manual N
Air Conditioning
Low Pressure, Low Velocity............. ACCA Manual D or
Duct System Design Manual Q
Winter and Summer Air Conditioning
For more information, contact these publishers:
ACCA
Air Conditioning Contractors of America
1712 New Hampshire Avenue
Washington, DC 20009
Telephone: (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
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
Manual2100-653A
Page
3 of 44
Q-TEC Series General Information
Q-TEC MODEL NOMENCLATURE
Q
36
H
MODEL
NUMBER
3
D A
KW
0Z - 0KW
05 - 5KW
06 - 6KW
09 - 9KW
10 -10KW
12 -12KW
15 -15KW
HEAT
PUMP
REVISION
CAPACITY
24 - 2 Ton
30 - 2½ Ton
36 - 3 Ton
43 - 3½ Ton
48 - 4 Ton
60 - 5 Ton
10
DEHUMIDIFICATION
REHEAT CYCLE
X
X
X
FILTER OPTIONS
X - 1" Fiberglass
(Standard)
F - 2" Fiberglass
P - 2" Pleated
VOLTS & PHASE
A - 230/208/60/1
B - 230/208/60/3
C - 460/60/3
X
COIL OPTIONS
X - Standard
1 -Phenolic coated
evaporator*
2 -Phenolic coated
condenser
3 -Phenolic coated
evaporator & condenser coil*
COLOR
V - Platinum w/Slate
Front (Vinyl)
X - Beige paint
4 - Gray paint
*and reheat if applicable
X
INTERNAL
CONTROLS
X - Standard
•High Pressure Switch
•Low Pressure Switch
•Compressor Control
Module w/Time Delay
E - Low Ambient Control
Q - Outdoor Thermostat
R - Low Ambient Control
& Outdoor Thermostat 
CLIMATE CONTROL OPTIONS
X - None j
E - Electronic/Prog/Humidistat 
I - Electronic/Prog/Humidistat/CO2 
J - CS9BE-THO (BACnet IP or Ethernet)
K - CS9BE-THOC w/CO2 (BACnet IP or Ethernet)
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/Independent Intake & Exhaust Control
NOTE: 



X
If “X” control option is selected, thermostat and humidistat, if applicable, or DDC control system must be field supplied.
8403-060 Thermostat
8403-060 Thermostat & 8403-067 CO2 Controller
Not available with "X" control option, and for all other climate control options is a single sensor that functions with unit-mounted
thermostat.
TABLE 1
Factory Built-In Electric Heat
(See Table 2 for Available Electric Heat by Unit Model)
At 240V 
Nominal
KW
KW
1-Ph
Amps
5.0
5.0
20.8
6.0
6.0
9.0
9.0
10.0
10.0
12.0
12.0
15.0
15.0
3-Ph
Amps
At 460V k
KW
17,065
3.75
18.0
14.4
20,478
4.50
12.5
15,359
6.0
7.2
20,478
5.52
6.9
18,840
21.7
30,717
6.75
18.7
23,038
9.0
10.8
30,717
8.28
10.4
28,260
34,130
7.50
28.9
40,956
9.00
36.1
51,195 11.25
54.1
BTUH
KW
3-Ph
Amps
BTUH
KW
3-Ph
Amps
BTUH
12,799
36.1
 These electric heaters are available in 230/208V units only.
 These electric heaters are available in 480V units only.
Manual2100-653A
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3-Ph
Amps
At 480V 
BTUH
41.7
62.5
At 208V 
1-Ph
Amps
25,598
25.0
30,717
12.0
14.4
40,956 11.04
13.9
37,680
31.2
38,396
15.0
18.0
51,195 13.80
17.3
47,099
TABLE 2 – Electrical Specifications
MODEL
Q24H3DA0Z
A05
A10
Q24H3DB0Z
B06
B09
Q24H3DC0Z
C06
C09
Q30H3DA0Z
A05
A10
Q30H3DB0Z
B06
B09
B12
Q30H3DC0Z
C06
C09
C12
Q36H3DA0Z
A05
A10
 A15
Q36H3DB0Z
B06
B09
 B15
Q36H3DC0Z
C06
C09
 C15
Q43H3DA0Z
A05
A10
 A15
Q43H3DB0Z
B06
B09
 B15
Q43H3DC0Z
C06
C09
 C15
Q48H3DA0Z
A05
A10
 A15
Q48H3DB0Z
B06
B09
 B15
Q48H3DC0Z
C06
C09
 C15
Q60H3DA0Z
A05
A10
 A15
Q60H3DB0Z
B09
 B15
Q60H3DC0Z
C09
 C15
Rated Volts
& Phase
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
No.
Field
Power
Circuits
1
1
1 or 2
1
1
1
1
1
1
1
1
1 or 2
1
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1 or 2
1
1
1
1
1
1

Minimum
Circuit
Ampacity
22
47
72
17
35
44
10
19
23
27
52
77
19
38
47
56
13
22
26
31
29
55
79
82
21
39
48
52
13
22
27
27
31
57
81
81
26
44
53
53
13
22
27
27
37
62
87
87
28
47
56
56
16
25
29
29
42
67
92
92
32
59
59
16
31
31
Single Circuit


Maximum
Field
External
Power
Fuse or Ckt.
Wire Size
Brkr.
30
50
80
20
35
45
15
20
25
35
60
80
25
40
50
60
15
25
30
35
40
60
80
90
30
45
50
60
15
25
30
30
45
60
90
90
35
50
60
60
15
25
30
30
50
70
90
90
40
50
60
60
20
25
30
30
60
80
100
100
45
60
60
20
35
35
10
8
4
12
8
8
14
12
10
8
6
4
10
8
8
6
14
10
10
8
8
6
4
4
10
8
8
6
14
10
10
10
8
6
4
4
8
8
6
6
14
10
10
10
8
6
3
3
8
8
6
6
12
10
10
10
8
4
3
3
8
6
6
12
8
8

Ground
Wire
 Minimum
Circuit
Ampacity
Dual Circuit

 Maximum
Field Power
External Fuse or
Wire Size
Ckt. Breaker

Ground
Wire Size
Ckt. A
Ckt. B
Ckt. A
Ckt. B
Ckt. A
Ckt. B
Ckt. A
Ckt. B
22
50
30
50
10
8
10
10
27
50
30
50
10
8
10
10
29
32
50
50
45
45
50
50
8
8
8
8
10
10
10
10
31
33
50
50
45
45
50
50
8
8
8
8
10
10
10
10
37
37
37
25
50
50
50
50
50
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
42
42
42
25
50
50
60
60
60
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
10
10
8
12
10
10
14
12
10
10
10
8
10
10
10
10
14
10
10
10
10
10
8
8
10
10
10
10
14
10
10
10
10
10
8
8
10
10
10
10
14
10
10
10
10
8
8
8
10
10
10
10
12
10
10
10
10
8
8
8
10
10
10
12
10
10
Maximum size of the time delay fuse or 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.
mMaximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heating only.
nMaximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heating only.
NOTE: Reference Form 7960-582 for dehumidification model performance information.
Manual2100-653A
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FIGURE 1
Unit Dimensions
Manual2100-653A
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SHIPPING DAMAGE
FIGURE 2
Air Seal Under Q-TEC Unit
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 forklift since the air seal under the unit
could be damaged (see Figure 2).
The shipping brackets on each side of the unit must be
removed and discarded (see Figure 3-A). The return air
grille panel can be removed to provide a place to hold
the unit. The unit can be slid forward on the skid until
the front wheels hang over the edge of the skid (see
Air Seal
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
B Front wheels over edge
C Front wheels on floor
Manual2100-653A
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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
FIGURE 4
Unit on Appliance Cart
Q-TEC Unit
(Right Side)
back to be rolled through the door. Be careful when
setting the unit back up to keep from damaging the
unit.
GENERAL
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.
The unit is designed for use with or without duct work.
For use without duct work, Plenum Box QPB42 is
recommended.
These instructions explain the recommended method
to install the air cooled self-contained unit and the
electrical wiring connections to the unit.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly “Start
Procedure” and any tags and/or labels attached to the
equipment.
While these instructions are intended as a general
recommended guide, they do not supersede any
national and/or local codes in any way. Authorities
having jurisdiction should be consulted before the
installation is made. See page 3 for information on
codes and standards.
Size of unit for a proposed installation should be based
on heat loss calculation made according to methods
of Air Conditioning Contractors of America (ACCA).
The air duct should be installed in accordance with
the Standards of the National Fire Protection Systems
of Other Than Residence Type, NFPA No. 90A, and
Residence Type Warm Air Heating and Air Conditioning
Systems, NFPA No. 90B. Where local regulations are
at a variance with instructions, installer should adhere
to local codes.
MINIMUM INSTALLATION HEIGHT
The minimum installation height of the unit with a Free
Blow Plenum is 8' 6". This provides enough clearance
for the plenum to be removed (see Figure 5).
Strap
Appliance
Cart
Compressor
Manual2100-653A
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The minimum installation height for ducted
applications is 8' 4½". This provides enough clearance
to install the duct work (see Figure 6).
FIGURE 5
Installation with Duct Free Plenum
FIGURE 6
Ducted Application
Manual2100-653A
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DUCT WORK
Any heat pump is more critical of proper operating
charge and an adequate duct system than a straight air
conditioning unit. All duct work must be properly sized
for the design airflow requirement of the equipment.
Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing. All duct work or
portions thereof not in the conditioned space should
be properly insulated in order to both conserve energy
and prevent condensation or moisture damage. When
duct runs through unheated spaces, it should be
insulated with a minimum of one inch of insulation.
Use insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect
the duct work to the equipment in order to keep the
noise transmission to a minimum.
The Q-TEC series heat pump has provision to attach a
supply air duct to the top of the unit. Duct connection
size is 12" x 20". 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 airflow up to the maximum ESP shown in Table 9.
However, for quiet operation of the air system, the duct
static should be kept as low as practical, within the
guidelines of good duct design.
FILTERS
Two 1" throw away filters [(1) 16x16 and (1) 16x20]
are supplied with each unit. The filters slide into filter
brackets (see Figure 8).
The filters are serviced from the inside of the building
by opening the hinged door. This door is attached by
one torx screw and one locking latch.
The internal filter brackets are adjustable to
accommodate 2" filters. The tabs for the 1" filters
must be bent down to allow the 2" filters to slide in
place.
FIGURE 8
Filter Location
Supply duct
(field supplied)
Attachment
screws (field
supplied)
Filters
Room side of
Q-TEC unit
Duct flange provided
with unit
NOTE: Unit cabinet, supply air duct and duct free
plenum are approved for “0” clearance to
combustible material.
The Q-TEC series heat pumps are designed for use with
free return (non-ducted) and either free blow with the
use of QPB Plenum Box or a duct supply air system.
The QPB and QPBHW Plenum Box mounts on top
of the unit and has both vertically and horizontally
adjustable louvers on the front discharge grille.
Manual2100-653A
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Return Air Grille
FRESH AIR INTAKE
This unit is equipped with a fresh air damper assembly.
The damper blade is locked in the closed position
when the unit is shipped from the factory. To allow
the damper to operate, remove the two plastic locking
pins, one on each end of the blade. This will allow
for maximum fresh airflow. The damper blade will
now open when the indoor blower is operating. If less
than maximum fresh airflow is required, re-insert 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 page 30.
The rear drain can be used with wall thickness of up
to 10" where a water trap can be installed between the
unit and the interior wall (see Figure 10). The trap
cannot extend beyond the edge of the unit or it will
interfere with the wall mounting bracket. The drain
can be routed through the floor or through the wall. If
the drain is routed through the wall, the drain line must
be positioned such that it will not interfere with the
sleeve flange or the grille (see Figure 11). If the drain
is to be routed through an unconditioned space, it must
be protected from freezing.
OPTIONAL REAR DRAIN KITS
An optional rear drain kit, Bard Model QCDS48A, is
also available for these products. The optional rear
drain kit offers multiple benefits that include the
following:
•
Allows unit to be rolled away from the sleeve
without having to disconnect any hard plumbing
connections.
•
Allows indoor coil condensate to be easily
connected to rear drain box while bypassing the
outdoor coil drain pan. This aids in minimizing
the potential for biological growth to occur by
minimizing the standing water and exposing it to
warm temperatures.
SERVICE LIGHT
See Figures 12A, 12B, 12C and 12D.
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 drain box permanently mounts onto the wall sleeve
and is then either piped directly outdoors, or can be
piped vertically. The Q-TEC unit is then equipped with
fittings on the rear of the unit that slide into the drain
box as it is wheeled towards the wall 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.
CONDENSATE DRAIN
There are two drain connections on the unit. The rear
drain is the primary drain, and is located on the right
lower rear panel of the unit. The optional side drain is
located on the bottom right side of the unit. The side
drain is shipped with a plug installed.
The side drain requires a water trap for proper drainage
(see Figure 9). The drain can be routed through the
floor or through the wall. If the drain is to be routed
through an unconditioned space, it must be protected
from freezing. The drain line must be able to be
removed from the unit if it is necessary to remove the
unit from the wall. When the side drain is used, the
plug must be removed and installed in the rear drain
outlet.
NOTE: Models equipped with a refrigerant subcooler
in the lower drain pan may experience a 2-3% decrease
in cooling performance and efficiency when the indoor
condensate is routed around the outdoor coil drain
pan/subcooler assembly. Unit rated performance and
efficiency are with the indoor condensate routed to the
outdoor coil pan.
There is also a heated version of the rear drain box
available (Model #QCDS48H) for installation in
northern climates where freezing may occur.
NOTE: Additional circuit needed for drain heater.
Manual2100-653A
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FIGURE 9
Optional Side Drain (Side View)
FIGURE 10
Standard Rear Drain
Q-TEC UNIT
FIGURE 11
Rear Drain (Top View)
Drain Line
Wall (maximum
10" for rear drain)
Sleeve
Couplings not
shown but
recommended
for ease of
removability for
service
Wall
Bracket
Water
Trap
Unit
Manual2100-653A
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Manual2100-653A
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DRAIN BOX
CAULK AROUND TUBE
OVERFLOW TUBE
WALL SLEEVE
FIGURE 12A
MIS-2469
FIGURE 12B
PLUG INSTALLED IN
SIDE Q/Tec DRAIN
REAR DRAIN CONNECTION IN
Q/Tec PRODUCT
IMPORTANT!
3/4" PLASTIC PIPE NIPPLE
SUPPLIED WITH DRAIN BOX KIT
(APPLY TEFLON TAPE TO
THREADS)
1/2" SLIP X 1/2" SLIP X 3/4" NPT
TEE SUPPLIED WITH DRAIN BOX KIT
(TIGHTEN THREADS SO TEE IS
HORIZONTAL TO FLOOR)
MIS-2470
Manual2100-653A
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FIGURE 12C
REMOVE KNOCK-OUT FOR
INDOOR DRAIN HOSE CONNECTOR
(If Used)
MIS-2471
Manual2100-653A
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15 of 44
FIGURE 12D
DRAIN HOSE FROM INDOOR
DRAIN PAN.
MOVE HOSE FROM ATTACHMENT IN
LOWER DRAIN PAN AND SLIDE ONTO
DRAIN BOX BARB FITTING, SECURING
WITH SUPPLIED CLAMP IF OUTDOOR
PAN IS BYPASSED. ( WILL REDUCE RISK
OF ALGAE GROWTH IN THE OUTDOOR
PAN BUT AT A SLIGHT COOLING
PERFORMANCE REDUCTION OF 2-3% )
MIS-2472
Manual2100-653A
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16 of 44
FIGURE 13A
Unit Mounting – Method 1
Side Trim
(2 PCS.)
Enlarged view of mounting bracket showing
sleeve to cabinet attachment
Side Trim
(2 PCS.)
Mounting Bracket
Wall
Sleeve
#8 Screw
Provided
(Light Color)
Mounting
Bracket
Cabinet Side
Panel
#10 Hex
Head Screw
Provided
Bottom Trim
Piece
Bottom Trim
Extension
FIGURE 13B
Unit Mounting – Method 2
Return Grille
Sleeve
Washer
Stud
Nut
Condenser
Door (Removed)
Lower Control Panel
MIS-2689
Manual2100-653A
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INSTALLATION
MOUNTING THE UNIT
When installing a Q-TEC unit near an interior wall on
the left side, a minimum of 8" is required but 12" is
preferred.
When installing a Q-TEC unit near an interior wall
on the right side, a minimum of 18" 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".
This clearance is required to allow for the attachment of
the unit to the sleeve and side trim pieces to the wall.
This unit is to be secured to the wall sleeve with
mounting brackets provided. The unit itself, the supply
duct and the free blow plenum are suitable of “0”
clearance to combustible material.
Following are the steps for mounting the Q-TEC.
For reference see Figure 13A for external mounting
bracket or 13B for internal bolt secured bracket
(recommended).
1. Attach mounting brackets to the wall sleeve with
screws provided. Either use external mounting
bracket (Fig. 13A) or internal bolt bracket (Fig. 13B).
2. Position the unit in front of the sleeve with the
condenser section toward the sleeve.
3. Remove the locking screws from the wheels (see
Figure 14).
4. Roll the unit into the sleeve. Make sure to check
both sides of the unit as it is being rolled to keep it
centered in the sleeve. Also check the alignment
to the mounting brackets. This unit must be level
from side to side. If adjustments are necessary,
shim up under the rollers with sheets of steel or
any substance that is not affected by moisture.
5. Make sure the gasket on the rear of the unit is
touching the sleeve across the top and down both
sides. This is a rain water seal.
6. Secure the mounting brackets to the unit with the
screws provided, #10 hex head sheet metal screws
(Figure 13A), or use nut and washer to secure
sleeve (Figure 13B).
7. Bottom trim extensions are provided for use when
wall is less than 14" but greater than 10.5". 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. They may
be cut to suit the ceiling height or overlap the unit
side trim. There is sufficient length to trim up to a
10' 2" ceiling.
NOTE: If the exterior wall thickness is between 5" to
10.5", a side trim extension piece kit, model QSTX42, is available.
FIGURE 14
Removing Locking Screws from Wheels
Remove screws from wheels
before rolling into place
Manual2100-653A
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WIRING – MAIN POWER
Refer to the unit rating plate and/or Table 2 for wire
sizing information and maximum fuse or 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 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.
FIGURE 15
Component Location
Side Field
Wire Entrance
Electric
Heaters
Unit
Mounted
Thermostat
Location
Remote
Thermostat
Terminal
Block
Indoor
Blower
Dehumidification
Control
Circuit Breaker
Panel and
Controls
Lower
Control
Panel
The field wiring connections are located behind the
top and hinged panel in the circuit breaker panel (see
Figure 15).
WIRING – LOW VOLTAGE
230/208V, 1 Phase and 3 Phase Equipment Dual
Primary Voltage Transformers
All equipment leaves the factory wired on 240V tap.
For 208V operation, reconnect from 240V to 208V tap.
The acceptable operating voltage range for the 240 and
208V taps are as noted in Table 3.
TABLE 3
Operating Voltage Range
TAP
RANGE
240V
253 – 216
208V
220 – 197
NOTE: The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
The standard climate control Option X is a remote
thermostat connection terminal block. See Figure
17 or Figure 18 for wiring diagram. Compatible
thermostats are listed in Table 4.
Climate control Option E is an electronic,
programmable thermostat with humidistat. The
subbase of the thermostat is factory wired to the front
panel of the unit. See Figure 19 for wiring diagram.
Compatible for use with energy recovery ventilator.
This unit has a refrigerant reheat circuit that is
controlled by a 3 way valve.
When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced.
The 3 way valve directs hot discharge gas into a
separate desuperheating condenser circuit that reheats
the conditioned air before it is delivered to the room.
When the humidistat is satisfied, the system switches
back to normal air conditioning mode.
If the thermostat calls for cooling during
dehumidification mode, the call for cooling takes
precedence over the dehumidification and the unit will
cool until the thermostat is satisfied. Once the call for
cooling is satisfied, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in
the dehumidification mode, the electric heaters will
energize and the evaporator airflow will return to the
heating airflow. When the thermostat is satisfied,
Manual2100-653A
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the electric heaters will turn off and the airflow will be
reduced and the system will continue to dehumidify until
humidistat is satisfied.
dehumidification and the unit will cool until the thermostat
is satisfied. Once the call for cooling is satisfied, the unit
may continue to dehumidify.
If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.
If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will energize
and the evaporator airflow will return to the heating airflow.
When the thermostat is satisfied, the electric heaters will
turn off and the airflow will be reduced and the system will
continue to dehumidify until humidistat is satisfied.
Climate control Option I is an electronic, programmable
thermostat with humidistat and a CO2 controller. The
subbase of the thermostat and CO2 controller are factory
wired to the front panel of the unit. See Figure 20 for
wiring diagram. This unit has a refrigerant reheat circuit
that is controlled by a 3 way valve.
If the unit is running in heat pump mode and the
humidstat calls for dehumidification, the dehumidification
mode takes precedence over the heat pump heating mode.
The unit will not return to the heating mode until 2nd
stage heating is called for.
On Option J Models only, the CO2 sensor in the controller
will energize the vent option and the ID blower when the
room CO2 levels rise over set level. Default CO2 setpoint is
950 ppm.
When the humidity is above the setpoint of the
humidistat, the compressor circuit and the 3 way valve
are energized and the evaporator airflow is reduced. The
3 way valve directs hot discharge gas into a separate
desuperheating condenser circuit that reheats the
conditioned air before it is delivered to the room. When
the humidistat is satisfied, the system switches back to
normal air conditioning mode.
NOTE: On Option X, field-provided means to control
ventilation must be used if any of the motorized
ventilation options are installed.
If the thermostat calls for cooling during dehumidification
mode, the call for cooling takes precedence over the
dehumidification and the unit will cool until the thermostat
is satisfied. Once the call for cooling is satisfied, the unit may continue to dehumidify.
If the thermostat calls for heat when the unit is in the
dehumidification mode, the electric heaters will energize and
the evaporator airflow will return to the heating airflow. When
the thermostat is satisfied, the electric heaters will turn off
and the airflow will be reduced and the system will continue
to dehumidify until humidistat is satisfied.
If the unit is running in heat pump mode and the
humidistat calls for dehumidification, the
dehumidification mode takes precedence over the heat
pump heating mode. The unit will not return to the
heating mode until 2nd stage heating is called for.
The CO2 controller will energize the vent option and the
ID blower when the room CO2 levels rise over set level.
Default CO2 setpoint is 950 ppm. See Figure 24.
Climate control Options J & K are an electronic,
programmable thermostat, humidistat and CO2 controller
"J" model only) with BACnet, MS/TP or Ethernet
connections.
When the humidity is above the setpoint of the humidistat,
the compressor circuit and the 3-way valve are energized
and the evaporator airflow is reduced. The 3-way valve
directs hot discharge gas into a separate desuperheating
condenser circuit that reheats the conditioned air before it is
delivered to the room. When the humidistat is satisfied, the
system switches back to normal air conditioning mode.
If the thermostat calls for cooling during dehumidification
mode, the call for cooling takes precedence over the
Manual2100-653A
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LOW VOLTAGE CONNECTIONS
FOR DDC CONTROL
Fan Only
Cooling Mode
Heat Pump Heating
2nd State Heating
(if employed)
Ventilation
Dehumidification
Emergency Heat
Energize G
Energize Y, G
Energize Y, G, B
Energize G, W2, Y, B
Energize G, O1
Energize 4
Energize B, W2, E, G
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage circuit.
The “R” terminal is the hot terminal and the “C” terminal
is grounded.
“G” terminal or pin 6 of P2 is the fan input. If the climate
control option is abandoned and connections are made
directly to P2 pin 6 of P2 must be energized for proper
operation.
“Y1” terminal or pin 7 of P2 is the compressor input.
“W1” terminal or pin 8 of P2 is the fist stage heat.
“R” terminal or pin 10 of P2 is 24 VAC hot.
“C” terminal or pin 11 of P2 is 24 VAC grounded.
Terminal “1” or pin 4 of P2 is the dehumidification circuit.
Terminal “2” or pin 12 of P2 is the dehumidification
circuit. A contact must connect terminals 1 and 2.
“W2” terminal or pin 9 of P2 is second stage heat (if
equipped). If the unit is equipped with an optional
hot water coil plenum box or electric heat these will be
energized by this terminal.
“F” terminal of pin 5 of P2 is the ventilation input.
This terminal energizes any factory installed ventilation
option.
NOTE: For total and proper control using DDC, a total
of 7 controlled outputs are required (6 if no
ventilation system is installed). For proper
system operation under Emergency Heat
conditions where the compressor needs to
be deactivated, the B-W2-E outputs need to
be energized. Removing the Y (compressor)
signal alone turns the compressor off, but does
not activate the additional circuitry embedded
in the heat pump for proper and complete
operation.
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.
TABLE 4
Wall Thermostats and Controls
Thermostat
Predominant Features
8403-067
Carbon Dioxide Sensor with LCD for Sensor Readings
8403-060
(1120-445)
3 stage Cool; 3 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover
8403-081
(VT8650U5500B)
2 stage Cool; 2 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional, Auto or Manual changeover
with Humidity and Occupancy Sensor, BACnet
CSB9E-THO
3 stage Cool; 3 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover with Humidity Control
BACnet MS/TP or Ethernet Connection
CSB9E-THOC
3 stage Cool; 3 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover with CO2 and Humidity
Control
BACNet MS/TP or Ethernet Connection
FIGURE 16
MIS-1285
Manual2100-653A
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Manual2100-653A
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1
A
G
Y1
SC
G
Y1
C
L
C
L
8
5
6
17
7
9
12
1
4
3
4
Black/White
C
2
Red/White
R
L
Brown
Blue
Yellow
Orange
Brown/White
Purple/White
W2
W1
B
Y1
Y
G
O1
Red/Yellow
Red/White
5
E
Black/White
6
12
11
10
9
8
7
6
Brown
Blue
Yellow
Orange
1 Black/White
2 Red/White
3
4
5
Plug #4
E TO W2 ON LOW VOLTAGE TERMINAL BLOCK
2 JUMPER
WHEN USING 8403-081 TSJDT WITH 15KW HEAT
1 FACTORY INSTALLED JUMPER
Low Voltage
8403-060
Thermostat 8403-081 Term. Block
Thermostat
R
W2
W2
R
SC
B
O/B
D/YO
A
SC
W1/E
D
W1/E
"J" CS9BE-THO
"K" CS9BE-THOC
Brown/White
Purple/White
Red
Black/White
Red/White
Freeze
Protect Tstat
Bard Part #8408-038
A2
D
B
Y
C
R
RAT
W2
G
YO
TWV
A1
W
BK
E1
G1
RV
L
E1
L
Relay Logic Board
Dehumidification Wiring Diagram
With "X" Thermostat Option
Black/White
Red/White
Return Air
Thermostat
Pink
3
12
11
10
9
8
7
6
1
2
3
4
5
4102-063 C
2
Red/White
Brown
Blue
Yellow
Orange
Brown/White
Purple/White
Red/Yellow
Black
Plug #2
FIGURE 17
Remote Thermostat Wiring Diagram
“X” Thermostat Option
2
1
Red/White
Black/White
W2
R
C
O/B
W2
R
C
L
9
8
7
6
17
Low Voltage
Term. Block
L
W1
B
Blue
Yellow
Orange
12
11
10
9
8
7
6
Brown
Blue
Yellow
Orange
1 Black/White
2 Red/White
3
4
5
Plug #4
Brown/White
Purple/White
Red
2 JUMPER E TO W2 ON LOW VOLTAGE TERMINAL BLOCK WHEN
USING 8403-081 THERMOSTAT WITH UNIT WITH 15KW OF HEAT
1 FACTORY INSTALLED JUMPER
8403-060
8403-081 Thermostat
Thermostat
5
Brown
Y
Y1
3
Y1
G
G
4
Brown/White
4
O1
A
Purple/White
Red/Yellow
Red/White
5
E
12
Black/White
2
Black/White
Red/White
Freeze
Protect Tstat
Bard Part #8408-038
A2
D
B
Y
C
R
RAT
W2
G
YO
TWV
A1
W
BK
E1
G1
RV
L
E1
L
Relay Logic Board
Red/White
Return Air
Thermostat
Pink
Black/White
Dehumidification Wiring Diagram
With "X" Thermostat Option
And Demand Ventilation
6
W1/E
Red/White
D/YO
6
5
TEMP-OUT 4
CO2-OUT 3
24 VAC
Optional
CO2 Controller
Bard Part #8403-067
2
12
11
10
9
8
7
6
1
2
3
4
5
MIS-2690 E
3
Red/White
Brown
Blue
Yellow
Orange
Brown/White
Purple/White
Red/Yellow
Black
Plug #2
FIGURE 18
Remote Thermostat Wiring Diagram
“X” Thermostat Option and Demand Ventilation
Manual2100-653A
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Manual2100-653A
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Brown/White
Orange
Yellow
Blue
Brown
Red/White
Black/White
G
Y1
B
W2
R
C
L
Purple/White
A
Red/Yellow
D/YO
W1/E
8403-060
Thermostat
12
11
10
9
8
7
6
5
4
3
2
1
Plug #4
Brown
Blue
Yellow
Orange
Red/White
Black/White
Brown/White
Purple/White
Red
Black/White
Red/White
Freeze
Protect Tstat
Bard Part #8408-038
A2
W2
D
B
Y
C
R
RAT
YO
A1
G
TWV
BK
E1
L
W
RV
G1
E1
L
Relay Logic Board
FIGURE 19
Unit Mounted Thermostat Wiring Diagram
“E” Thermostat Option
Black/White
Red/White
Return Air
Thermostat
Pink
Dehumidification Wiring Diagram
With "E" Thermostat Option
2
12
11
10
9
8
7
6
1
2
3
4
5
4102-064
3
Red/White
Brown
Blue
Yellow
Orange
Brown/White
Purple/White
Red/Yellow
Black
Plug #2
Wiring Diagram
With "I" Thermostat Option
FIGURE 20
Unit Mounted Thermostat Wiring Diagram
“I” Thermostat Option
CO2 Controller
Bard Part #8403-067 2
1
3
TEMP-OUT
4
1
5
Black/White
CO2-OUT
Red/White
2
Red/White
24 VAC
Brown/White
6
8403-060 4
Thermostat
W1/E
Red/Yellow
D/YO
Purple/White
A
Plug #4 3
1
2
3
4
5
6
G
Orange
Y1
Yellow
B
Blue
8
W2
Brown
9
R
Red/White
10
C
Black/White
11
L
7
12
4102-066 B
Manual2100-653A
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Manual2100-653A
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Brown/White
Orange
Yellow
SC
G
Y1
Red/White
Black/White
R
C
L
Brown
W2
SC
B
Blue
Purple/White
A
SC
Red/Yellow
D
W1/E
"J" CS9BE-THO"
K" CS9BE-THOC
12
11
10
9
8
7
6
5
4
3
2
1
Plug #4
Brown
Blue
Yellow
Orange
Red/White
Black/White
Brown/White
Purple/White
Red
Black/White
Red/White
Freeze
Protect Tstat
Bard Part #8408-038
A2
W2
D
B
Y
C
R
RAT
YO
A1
G
TWV
BK
E1
L
W
RV
G1
E1
L
Relay Logic Board
FIGURE 21
Unit Mounted Thermostat Wiring Diagram
“J” or "K" Thermostat Option
Black/White
Red/White
Return Air
Thermostat
Pink
Dehumidification Wiring Diagram
With "E" Thermostat Option
2
12
11
10
9
8
7
6
1
2
3
4
5
4102-079
3
Red/White
Brown
Blue
Yellow
Orange
Brown/White
Purple/White
Red/Yellow
Black
Plug #2
START UP
These units require R-410A refrigerant and
Polyol Ester oil.
GENERAL
1. Use separate service equipment to avoid cross
contamination of oil and refrigerants.
2. Use recovery equipment rated for R-410A
refrigerant.
3. Use manifold gauges rated for R-410A (800
psi/250 psi low).
4. R-410A is a binary blend of HFC-32 and HFC125.
5. R-410A is nearly azeotropic—similar to R-22 and
R-12. Although nearly azeotropic, charge with
liquid refrigerant.
6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot
withstand this higher pressure.
7. R-410A has an ozone depletion potential of zero,
but must be reclaimed due to its global warming
potential.
8. R-410A compressors use Polyol Ester oil.
9. Polyol Ester oil is hygroscopic; it will rapidly absorb
moisture and strongly hold this moisture in the oil.
REMEMBER: When adding R-410A refrigerant, it
must come out of the charging cylinder/tank as a liquid
to avoid any fractionation, and to insure optimal system
performance. Refer to instructions for the cylinder that
is being utilized for proper method of liquid extraction.
WARNING
Failure to conform to these practices
could lead to damage, injury or death.
SAFETY PRACTICES
1. Never mix R-410A with other refrigerants.
2. Use gloves and safety glasses. Polyol Ester oils
can be irritating to the skin and liquid refrigerant
will freeze the skin.
3. Never use air and R-410A to leak check; the
mixture may become flammable.
4. Do not inhale R-410A—the vapor attacks
the nervous system, creating dizziness, loss
of coordination and slurred speech. Cardiac
irregularities, unconsciousness and ultimate death
can result from breathing this concentration.
10.A liquid line dryer must be used—even a deep
vacuum will not separate moisture from the oil.
5. Do not burn R-410A. This decomposition
produces hazardous vapors. Evacuate the area if
exposed.
11.Limit atmospheric exposure to 15 minutes.
6. Use only cylinders rated DOT4BA/4BW 400.
12.If compressor removal is necessary, always plug
compressor immediately after removal. Purge with
small amount of nitrogen when inserting plugs.
7. Never fill cylinders over 80% of total capacity.
TOPPING OFF SYSTEM CHARGE
9. Never heat cylinders above 125°F.
If a leak has occurred in the system, Bard
Manufacturing recommends reclaiming, evacuating
(see criteria above), and charging to the nameplate
charge. If done correctly, topping off the system
charge can be done without problems.
10.Never trap liquid R-410A in manifold sets, gauge
lines or cylinders. R-410A expands significantly
at warmer temperatures. Once a cylinder or line is
full of liquid, any further rise in temperature will
cause it to burst.
8. Store cylinders in a cool area, out of direct
sunlight.
With R-410A, there are no significant changes in the
refrigerant composition during multiple leaks and
recharges. R-410A refrigerant is close to being an
azeotropic blend (it behaves like a pure compound
or single component refrigerant). The remaining
refrigerant charge, in the system, may be used after
leaks have occurred and then “top-off” the charge by
utilizing the pressure charts on the inner control panel
cover as a guideline.
Manual2100-653A
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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 Pressure Switch
Provides refrigerant circuit high pressure protection.
Includes lockout circuit that is resettable from room
thermostat.
Compressor Control Module
Provides short cycle protection for the compressor
which extends compressor life, as well as high and low
pressure switch monitoring and alarm functions.
Service Lights
One service light indicates when service is required.
•
Check System – detects high or low pressure
switch operation for compressor protection.
OPTIONAL CFM (Q36H3D, Q42H3D,
Q48H3D AND Q60H3D 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 coil cleaner.
Manual2100-653A
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PHASE MONITOR
All units with three phase scroll compressors are
equipped with a three 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 even 1 hour may have a negative impact on
the bearing due to oil pump out.
All three phase scroll compressors used in the Q-TEC
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.
SERVICE HINTS
1. Caution user to maintain clean air filters at all
times and to not needlessly close off supply air
registers. This may reduce airflow 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 again, 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.
g. Remove screws that attach the duct work to
the unit flanges.
7. Annual maintenance is required to ensure 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 to the 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 below.
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 re-installed.
This unit is equipped with four rollers mounted
to the base. For ease in pulling unit out from
the wall, it may be desirable to remove the
bottom service door, which requires removal of
the return air panel. Grip the front flange of
the base pan and pull straight out.
Manual2100-653A
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VENT OPTIONS
Q-TEC Energy Recovery Ventilator (Option)
Barometric Fresh Air Damper (Standard)
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 22).
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 23).
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.
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.
Manual2100-653A
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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.
FIGURE 22
Fresh Air Damper Removal
Mounting Screw
Manual2100-653A
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31 of 44
FIGURE 23
QERV Removal
Power
Connectors
Mounting Screws
Lower Blower Assembly
Blower Connector
Front Fill
Manual2100-653A
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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 the 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 (thus eliminating pressure
equalization noise except during defrost), are available
and dependent on the thermostat used.
The first option uses an “Auto” option. A circuit is
completed for R-W1 and R-Y on each heating “on”
cycle, 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 makes, starting indoor blower motor.
Reheat Circuit – There is a small capillary tube inserted
between the reheat coil return line and suction line
that will prevent liquid from accumulating in the reheat
coil when it is inactive. This drain does not affect the
normal operation of the system.
There is a check valve located in the reheat coil
return line. It has a soft spring to hold the ball on the
seat. This will make the method of checking the ball
freedom with a magnet difficult. Refer to Figures 25
and 26 for the location of the check valve and drain
back capillary.
When the system is operating in the dehumidification
mode, the suction pressure will be reduced by 4 to 8 psig
and the discharge pressure will be reduced by 19 to 22
psig.
Return Air Thermostat – In dehumidification mode if
the return air temperature is lower than 65°, the return
air thermostat closes and brings on stage one electric
heat to maintain 65°.
High/Low Pressure Control provides protection for the
compressor. In the event system pressures go above
600 PSI or below 15 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 bypass timer should be set to 120 seconds. This
is to assure there is no nuisance tripping of the lowpressure control during startup in heating mode under
cold weather conditions.
FIGURE 24 – CO2 Controller (Factory set to 950 ppm)
PRESS UP AND DOWN
ARROWS TO ENTER
CONFIGURATION MODE
USE ARROWS TO SELECT
SETTING. PUSH MIDDLE
BUTTON TO CHANGE.
CONTROLLER WILL
SHOW SET.
NOTE: MENU
JUMPER MUST
BE SET TO "ON"
TO CHANGE ANY
SETTINGS WITH
THE FRONT BUTTONS.
TO LOCK THE CO2
CONTROLLER MOVE
JUMPER TO "OFF" AFTER
IT HAS BEEN CONFIGURED
Settings Recommended Default
RON
1000
1000
ROF
950
950
DSP
C
CT
UNI
US
US
COL
Not Used
COH
Not Used
TOL
Not Used
TOH
Not Used
See Instrution with Controller
BAR For High Altitude Installations
CAL
Used for Field Calibration
MIS-3326
Manual2100-653A
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33 of 44
REFRIGERANT TUBE SCHEMATIC FOR
REHEAT COIL
Figure 25 shows the refrigerant gas flow through the
reheat coil during the dehumidification mode.
When the unit is in standard cooling (Figure 26) or
heating mode, the reheat coil is inactive.
FIGURE 25
Q-TEC Dehumidification Mode Circuit Diagram
Manual2100-653A
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FIGURE 26
Q-TEC Cooling Mode Circuit Diagram
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.
WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result
in eye injuries or refrigerant burns!
To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.
This unit employs high-flow Coremax valves instead of
the typical Shrader type valves.
Manual2100-653A
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DEFROST CYCLE
The defrost cycle is controlled by temperature and time
on the solid state heat pump control.
When the outdoor temperature is 32°F or below,
defrosting of the coil is required. This coil temperature
is sensed by the coil temperature sensor mounted near
the bottom of the outdoor coil. Once coil temperature
reaches 30°F or below, the coil temperature sensor
sends a signal to the control logic of the heat pump
control and the defrost timer will start accumulating
run time.
After 30, 60 or 90 minutes of heat pump operation 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 temperature 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 8 minutes.
The heat pump defrost control board has an option of
30, 60 or 90-minute setting. By default, this unit is
shipped from the factory with the defrost time on the
30 minute pin. If circumstances require a change to
another time, remove the jumper from the 30-minute
terminal and reconnect to the desired terminal. Refer
to Figure 27.
There is a cycle speed up jumper on the control. This
can be used for testing purposes to reduce the time
between defrost cycle operation without waiting for
time to elapse.
Use a small screwdriver or other metallic object,
or another ¼" 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 terminals.
Otherwise the timing will remain accelerated and
run through the 1-minute minimum defrost length
sequence in a matter of seconds and will automatically
terminate the defrost sequence.
Manual2100-653A
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36 of 44
There is an initiate defrost jumper (sen jump) 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
¼" 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.
Low Pressure Switch Bypass Operation – The control
has a selectable (SW1) low pressure switch bypass set
up to ignore the low pressure switch input during the
first (30, 60, 120 or 180 seconds) of “Y” operation.
After this period expires, the control will then monitor
the low pressure switch input normally to make sure
that the switch is closed during “Y” operation.
High Pressure Switch Operation – The control has a
built-in lockout system that allows the unit to have the
high pressure switch trip up to two times in 1 hour and
only encounter a “soft” lockout. A “soft” lockout shuts
the compressor off and waits for the pressure switch to
reset, which at that point then allows the compressor
to be restarted as long as the 5-minute short cycle
timer has run out. If the high pressure switch trips a
third time within 1 hour, the unit is in “hard” lockout
indicating something is certainly wrong and it will not
restart itself.
There is also a 5-minute compressor time delay
function built into the HPC. This is to protect the
compressor from short cycling conditions. The board’s
LED will have a fast blink rate when in the compressor
time delay. 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.
FIGURE 27
Defrost Control Board
LOW PRESSURE BYPASS TIMER SWITCH
(FACTORY SETTING 120 SECONDS)
SW SW
1
2 TIME (SEC)
OFF OFF
30
ON OFF
60
OFF ON
120*
ON ON
180
OFF
ON
ACCUMULATED RUN TIME SELECTOR
(FACTORY SETTING 30 MIN.)
MIS-2684 A
Manual2100-653A
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TROUBLESHOOTING
SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE
3. Turn thermostat blower to “auto” position. Indoor
blower should stop. NOTE: Many models have a
1-minute blower time delay on “off” command;
wait for this to time-out.
NOTE:A thorough understanding of the defrost
cycle sequence is essential. Review that
section found earlier in this manual prior to
troubleshooting the control.
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.
1. Turn on AC power supply to unit.
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.
2. Turn thermostat blower switch to “fan on”;
the indoor blower should start. (If it doesn’t,
troubleshoot indoor unit and correct problem.)
TABLE 5
Troubleshooting
Sympton
Compressor
will not start
(heating or
cooling)
Description, Check & Possible Causes
What & How to Check/Repair
1. Check for LED illumination.
Is there an LED illuminated on the board (flashing)?
Yes = go to Step #2; No = go to Step #3
2. Check for error codes.
Is the LED flashing a Code?
Yes = go to Step #4; No = go to Step #8
3. Check for power at board.
Is there 24 volts AC between R and C?
Yes = go to Step #13; No = go to Step #9
4. Check codes.
What code is blinking?
Code "1", go to Step #6; Code "2", go to Step#7; Fast Blink, go to Step #5
5. Compressor delay active.
Check for proper operation; if still needed, go back to Step #1.
Wait for 5 minute delay or jump board's "speed up pins".
6. Low pressure fault.
Check wiring circuit and unit pressures.
7. High pressure fault.
Check wiring circuit and unit pressures.
8. Check for Compressor input signal.
Is there 24 volts AC between Y and C?
Yes = go to Step #10; No = go to Step #11
9. No power to board.
The unit either does not have unit voltage, the transformer is bad or the unit wiring is incorrect.
10. Check for Compressor output signal.
Is there 24 volts AC between CC & C?
Yes = go to Step #12; No = go to Step #13
11. No "Y" compressor input signal.
Check thermostat wiring, incorrect phase of unit (see section on Phase Monitor), and finally unit wiring.
12. No "CC" compressor output signal.
Check compressor contactor for proper operation and finally check compressor.
13. Faulty board.
Replace defrost board.
Check across fan relay on heat pump control. (Com-NC)
Replace heat pump control.
Fan outdoor
Heat pump control defective
motor does
not run
Motor defective
(cooling or
heating except
during defrost) Motor capacitor defective
Check for open or shorted motor winding. Replace motor.
Check capacitor rating. Check for open or shorted capacitor. Replace capacitor.
Reversing
Heat pump control defective
valve does not
energize
(heating only) Reversing valve solenoid coil defective
Check for 24V between RV-C and B-C.
1. Check control circuit wiring.
2. Replace heat pump control.
Check for open or shorted coil.
Replace solenoid coil.
Unit will not
go into defrost Temperature sensor or heat pump control defective
(heating only)
Disconnect temperature sensor from board and jumper across "SPEEDUP" 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.
2. If unit does not go through defrost cycle, replace heat pump control.
Unit will not
come out of
Temperature sensor or heat pump control defective
defrost
(heating only)
Jumper across "SPEEDUP" terminal.
This should cause the unit to come out of defrost within one minute.
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.
LED Blink Codes
Blink
Function
Blink
Function
Slow
Normal function (1.0 sec on/1.0 sec off)
2
High pressure switch failure/“Soft” Lockout
Fast
Compressor Delay timer active (0.1 sec on/0.1 sec off)
3
Defrost mode active
Low pressure switch failure
4
High pressure switch failure/“Hard” Lockout
1
Manual2100-653A
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CHECKING TEMPERATURE SENSOR
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the
heat pump control.
1. Disconnect temperature sensor from board and
from outdoor coil.
2. Use an ohmmeter to measure the resistance of the
sensor. Also use ohmmeter to check for short or
open.
5. If sensor is out of tolerance, shorted, open or reads
very low ohms, it should be replaced.
3. Check resistance reading to chart of resistance use
sensor ambient temperature. (Tolerance of part is
±10%.)
TABLE 6
Temperature (F) vs Resistance (R) of Temperature Sensor
F
-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
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
R
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
72910
70670
68507
66418
64399
62449
60565
58745
F
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
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
R
56985
55284
53640
52051
50514
49028
47590
46200
44855
43554
42295
41077
39898
38757
37652
36583
35548
34545
33574
32634
31723
30840
29986
29157
28355
27577
26823
26092
25383
24696
24030
23384
22758
22150
21561
20989
20435
19896
F
53.0
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
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
R
19374
18867
18375
17989
17434
16984
16547
16122
15710
15310
14921
14544
14177
13820
13474
13137
12810
12492
12183
11883
11591
11307
11031
10762
10501
10247
10000
9760
9526
9299
9077
8862
8653
8449
8250
8057
7869
7686
F
89.0
90.0
91.0
92.0
93.0
94.0
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
R
7507
7334
7165
7000
6840
6683
6531
6383
6239
6098
5961
5827
5697
5570
5446
5326
5208
5094
4982
4873
4767
4663
4562
4464
4367
4274
4182
4093
4006
3921
3838
3757
3678
3601
3526
3452
Manual2100-653A
Page
39 of 44
TROUBLESHOOTING ECM™ BLOWER MOTORS
Symptom
CAUTION:
Disconnect power from unit before removing or replacing
connectors, or servicing motor. To avoid electric shock
from the motor’s capacitors, disconnect power and wait at
least 5 minutes before opening motor.
Symptom
Cause/Procedure
Motor rocks slightly• This is normal start-up for ECM
when starting
Motor won’t start• Check blower turns by hand
• No movement
• Check power at motor
• Check low voltage (24 Vac R to C) at motor
• Check low voltage connections
(G, Y, W, R, C) at motor
• Check for unseated pins in connectors on motor harness
• Test with a temporary jumper between R - G
• Check motor for tight shaft
• Perform motor/control replacement check
• Perform Moisture Check
• Motor rocks, but won’t start
• Check for loose or compliant motor mount
• Make sure blower wheel is tight on shaft
• Perform motor/control replacement check
Motor oscillates up
& down while being
tested off of blower
• It is normal for motor to oscillate with no
load on shaft
Motor starts, but
runs erratically
• Varies up and down
• Check line voltage for variation or “sag”
or intermittent
• Check low voltage connections
(G, Y, W, R, C) at motor, unseated pins in
motor harness connectors
• Check “Bk” for erratic CFM command (in
variable-speed applications)
• Check out system controls, Thermostat
• Perform Moisture Check
• “Hunts” or “puffs” at
high CFM (speed)
• Does removing panel or filter reduce
“puffing”?
- Reduce restriction
- Reduce max airflow
• Stays at low CFM
despite system call
for cool or heat CFM
• Check low voltage (Thermostat) wires and
connections
• Verify fan is not in delay mode; wait until
delay complete
• “R” missing/not connected at motor
• Perform motor/control replacement check
• Stays at high CFM
• “R” missing/not connected at motor
• Is fan in delay mode? - wait until delay time
complete
• Perform motor/control replacement check
• Blower won’t shut off
• Current leakage from controls into G, Y or W?
Check for Triac switched thermostat or solidstate relay
Excessive noise
• Air noise
• Determine if it’s air noise, cabinet, duct or
motor noise; interview customer, if necessary
• High static creating high blower speed?
- Is airflow set properly?
- Does removing filter cause blower to slow
down? Check filter
- Use low-pressure drop filter
- Check/correct duct restrictions
Manual2100-653A
Page
40 of 44
Cause/Procedure
• Noisy blower or cabinet• Check for loose blower housing, panels, etc.
• High static creating high blower speed?
- Check for air whistling through seams in
ducts, cabinets or panels
- Check for cabinet/duct deformation
• “Hunts” or “puffs” at• Does removing panel or filter reduce
high CFM (speed)
“puffing”?
- Reduce restriction
- Reduce max. airflow
Evidence of Moisture
• Motor failure or malfunction has occurred
and moisture is present
• Evidence of moisture present inside air mover
Do
• Replace motor and Perform Moisture Check
• Perform Moisture Check
Don’t
• Check out motor, controls,• Automatically assume the motor is bad.
wiring and connections
thoroughly before replacing
motor
• Orient connectors down so • Locate connectors above 7 and 4 o’clock
water can’t get in
positions
- Install “drip loops”
• Use authorized motor and • Replace one motor or control model # with
model #’s for replacement another (unless an authorized replacement)
• Keep static pressure to a • Use high pressure drop filters; some have ½"
minimum:
H20 drop!
- Recommend high
• Use restricted returns
efficiency, low static filters
- Recommend keeping filters
clean.
- Design ductwork for min.
static, max. comfort
- Look for and recommend
ductwork improvement,
where necessary
• Size the equipment wisely • Oversize system, then compensate with low
airflow
• Check orientation before • Plug in power connector backwards
inserting motor connectors • Force plugs
Moisture Check
• Connectors are oriented “down” (or as recommended by equipment
manufacturer)
• Arrange harness with “drip loop” under motor
• Is condensate drain plugged?
• Check for low airflow (too much latent capacity)
• Check for undercharged condition
• Check and plug leaks in return ducts, cabinet
Comfort Check
•
•
•
•
•
•
Check proper airflow settings
Low static pressure for lowest noise
Set low continuous-fan CFM
Use humidistat and 2-speed cooling units
Use zoning controls designed for ECM that regulate CFM
Thermostat in bad location?
TROUBLESHOOTING GE ECM™ MOTORS CONT’D.
Replacing ECM Control Module
To replace the control module for the GE variable-speed indoor blower
Replacing
ECM
Control
Module
motor you need
to take
the following
steps:
To 1.
replace
the control
module
forreplacement
the GE variable-speed
blower
You MUST
have the
correct
module. Theindoor
controls
are
motor
need to take
the following
steps:
factoryyou
programmed
for specific
operating
modes. Even though they look
1.You
MUST have
the may
correct
module.functionality.
The controls
alike, different
modules
havereplacement
completely different
are
factory
programmed
for specific MODULE
operating modes.
Even PRODUCT
though
USING
THE
WRONG CONTROL
VOIDS ALL
they
look alike, different
modules
may have
completely different
WARRANTIES
AND MAY
PRODUCE
UNEXPECTED
RESULTS.
functionality.
2. Begin by removing AC power from the furnace or air handler being
USING
CONTROL
MODULE
VOIDS
ALLAC
PRODUCT
serviced.THE
DOWRONG
NOT WORK
ON THE
MOTOR
WITH
POWER
WARRANTIES
PRODUCE
UNEXPECTED
RESULTS.disconnect
APPLIED. To AND
avoidMAY
electric
shock from
the motor’s capacitors,
2.Begin
removing
power before
from the
furnace
or air handler
power andbywait
at least AC
5 minutes
opening
motor.
being
WORK
ON THEthe
MOTOR
WITHtheAC
POWER
3. Itserviced.
is usuallyDO
not NOT
necessary
to remove
motor from
blower
APPLIED.
To avoid electric
shock from
the
capacitors,
assembly. However,
it is recommended
that
themotor’s
whole blower
assembly,
disconnect
power
and waitfrom
at least
5 minuteshandler.
before opening
with the motor,
be removed
the furnace/air
(Follow motor.
the
3.It
is usually procedures).
not necessary
to remove
thecable
motor
from thetoblower
manufacturer’s
Unplug
the two
connectors
the motor.
assembly.
However,
it isconnector.
recommended
that the
whole
There are latches
on each
DO NOT
PULL
ON blower
THE WIRES.
assembly,
with theeasily
motor,
be properly
removedreleased.
from the furnace/air handler.
The plugs remove
when
(Follow
the manufacturer’s
procedures).
4. Locate
the two standard
¼" hex headUnplug
bolts atthe
the two
rearcable
of the control
connectors
motor.
are latches
on each
connector.
DO to
housing (at to
thethe
back
end ofThere
the control
opposite
the shaft
end). Refer
NOT
PULL
THE these
WIRES.
easily
properly
Figure
24. ON
Remove
twoThe
boltsplugs
fromremove
the motor
andwhen
control
assembly
released.
while holding the motor in a way that will prevent the motor or control
4.Locate
the
two the
standard
¼"removed.
hex headIfbolts
at the rear
of the
from falling
when
bolts are
an ECM2.0
control
is being
control
(at the
back
end of the
control
opposite
the shaft
replacedhousing
(recognized
by an
aluminum
casting
rather
that a deep-drawn
end).
Refer
tohousing
Figure 28.
Remove these
two only
boltsthe
from
the bolts.
black steel
can
the electronics),
remove
hex-head
motor
and REMOVE
control assembly
while holding SCREWS.
the motor in a way that
DO NOT
THE TORX-HEAD
will5.prevent
the motor
or is
control
fromoffalling
when attachment
the bolts are
The control
module
now free
mechanical
to the
removed.
If an ECM2.0
is being
by an
motor endshield
but is stillcontrol
connected
by a replaced
plug and (recognized
three wires inside
aluminum
rather
that
deep-drawn
black
steel
canplug
housing
the control.casting
Carefully
rotate
thea control
to gain
access
to the
at
the
electronics),
onlyWith
the hex-head
DO NOT
REMOVE
the control
end ofremove
the wires.
thumb andbolts.
forefinger,
reach
the
THE
SCREWS.
latch TORX-HEAD
holding the plug
to the control and release it by squeezing the
5.The
control
module
is now
free
mechanical
the
latch tab
and the
opposite
side of
theofconnector
plugattachment
and gently to
pulling
motor
endshield
is still connected
bycontrol.
a plug and
the plug
out of thebut
connector
socket in the
DO three
NOT wires
PULL
inside
theWIRES.
control. GRIP
Carefully
rotate
theONLY.
control to gain access to the
ON THE
THE
PLUG
plug
the
control
end of
Withdetached
thumb and
6. at
The
control
module
is the
nowwires.
completely
fromforefinger,
the motor.
reach
holding
the plugthat
to the
control and
release
it by
Verify the
withlatch
a standard
ohmmeter
the resistance
from
each motor
squeezing
latch
and
the opposite
side ofshell
theisconnector
lead (in the the
motor
plugtab
just
removed)
to the motor
>100K ohms.
plug
gently25.
pulling
the plug
out of the
connector
socket
in the
Referand
to Figure
(Measure
to unpainted
motor
end plate.)
If any
control.
NOT
ONnot
THE
WIRES.
GRIPtheTHE
PLUG
ONLY.
motor leadDO
fails
thisPULL
test, do
proceed
to install
control
module.
6.The
control module
is now completely
detached
from the motor.
THE MOTOR
IS DEFECTIVE
AND MUST
BE REPLACED.
Verify
withthe
a new
standard
ohmmeter
thatcause
the resistance
from each
Installing
control
module will
it to fail also.
motor
lead (in
plug just
removed)
to theformotor
7. Verify
thatthe
themotor
replacement
control
is correct
your shell is
>100K
ohms.
Refer
29. (Measure
to unpainted
motor
application.
Refer
to to
theFigure
manufacturer's
authorized
replacement
list.
end
plate.)
any motorCONTROL
lead fails this
test,RESULT
do not proceed
to
USING
THEIf WRONG
WILL
IN
install
the control
module.
THE MOTOR
IS DEFECTIVE
AND
MUST
IMPROPER
OR NO
BLOWER
OPERATION.
Orient the
control
BE
REPLACED.
the new
it to in
module
so that theInstalling
3-wire motor
plugcontrol
can be module
inserted will
into cause
the socket
fail
also.
the control.
Carefully insert the plug and press it into the socket until
7.Verify
the replacement
is correct
forWHEN
your
it latches.that
A SLIGHT
CLICK control
WILL BE
HEARD
application.
to the manufacturer's
replacement
Finish installing authorized
the replacement
control per
PROPERLY Refer
INSERTED.
list.
WRONG
CONTROL
one ofUSING
the threeTHE
following
paragraphs,
8a, 8bWILL
or 8c.RESULT IN IMPROPER
OR8a.
NOIFBLOWER
OPERATION.
the control(control
moduleinsocast
REPLACING
AN ECMOrient
2.0 CONTROL
that
the 3-wire
motor
plug on
canthe
beback
inserted
socket
the
aluminum
can with
air vents
of theinto
can)the
WITH
ANinECM
control.
Carefully
insertcontaining
the plug and
it into
the socket
untilin
2.3 CONTROL
(control
blackpress
potting
for water
protection
it
latches.
A SLIGHT
CLICK
WILL
BE HEARD
WHENofPROPERLY
black
deep-drawn
steel case
with
no vents
in the bottom
the can),
installing
theplastic
replacement
per one
the
INSERTED.
locate the twoFinish
through-bolts
and
tab that control
are packed
withofthe
three
following
paragraphs,
or 8c.
replacement
control.
Insert 8a,
the 8b
plastic
tab into the slot at the perimeter
8a.
IF open
REPLACING
2.0the
CONTROL
(control
in inside
cast of the
of the
end of theAN
canECM
so that
pin is located
on the
aluminum
vents
thesoback
of the
ANtab
ECM
perimeter ofcan
the with
can. air
Rotate
theoncan
that the
tab can)
insertsWITH
into the
2.3
CONTROL
(control
containing
black Using
potting
water
protection
locater
hole in the
endshield
of the motor.
thefortwo
through-bolts
in
black deep-drawn
steel case
with no
ventsthe
in the
bottom
of the
provided
with the replacement
control,
reattach
can to
the motor.
can),
the two through-boltsPROVIDED
and plastic tab
that THE
are packed
THE locate
TWO THROUGH-BOLTS
WITH
with
the replacement
control.
Insert the plastic
tab into theTHAN
slot at
REPLACEMENT
ECM
2.3 CONTROL
ARE SHORTER
the
the open end REMOVED
of the can soFROM
that the
pin ECM
is located
THEperimeter
BOLTS of
ORIGINALLY
THE
2.0
on
the insideAND
of the
perimeter
of the IF
can.
Rotate the
can so that
CONTROL
MUST
BE USED
SECURE
ATTACHMENT
the
inserts
into theTO
tabTHE
locater
hole inIS
theTO
endshield
of the
OF tab
THE
CONTROL
MOTOR
BE ACHIEVED.
motor.
Using
the two through-bolts
provided with the replacement
DO NOT
OVERTIGHTEN
THE BOLTS.
control, reattach the can to the motor.
THE TWO THROUGH-BOLTS PROVIDED WITH THE
REPLACEMENT ECM 2.3 CONTROL ARE SHORTER THAN THE
BOLTS ORIGINALLY REMOVED FROM THE ECM 2.0 CONTROL
AND
MUST2100-522B
BE USED IF SECURE ATTACHMENT OF THE
Manual
CONTROL
TO of
THE
Page
36
38MOTOR IS TO BE ACHIEVED.
DO NOT OVERTIGHTEN THE BOLTS.
8b. IF REPLACING AN ECM 2.3 CONTROL WITH AN ECM 2.3
CONTROL, the plastic tab and shorter through-bolts are not needed. The
8b.
IF REPLACING
ANinECM
CONTROL
WITH AN
ECMSURE
2.3 THE
control
can be oriented
two 2.3
positions
180° apart.
MAKE
CONTROL, the plastic
and shorter
are THE
not needed.
ORIENTATION
YOUtab
SELECT
FORthrough-bolts
REPLACING
The control can
be oriented
in CONTROL'S
two positions 180°
apart.
MAKE
CONTROL
ASSURES
THE
CABLE
CONNECTORS
SURE THE
ORIENTATION
YOU SELECTIN
FOR
REPLACING
THE
WILL
BE LOCATED
DOWNWARD
THE
APPLICATION
SO
CONTROL
ASSURES
THE CONTROL'S
CABLE
WILL
THAT
WATER
CANNOT
RUN DOWN
THECONNECTORS
CABLES AND
INTO
BE LOCATED
DOWNWARD
IN THE
WATER
THE
CONTROL.
Simply orient
theAPPLICATION
new control toSO
theTHAT
motor's
endshield,
CANNOT
RUN
AND INTO THETHE
CONTROL.
insert
bolts,
and DOWN
tighten.THE
DOCABLES
NOT OVERTIGHTEN
BOLTS.
Simply orient the new control to the motor's endshield, insert bolts,
8c. IF REPLACING AN ECM 2.0 CONTROL WITH AN ECM 2.0
and tighten. DO NOT OVERTIGHTEN THE BOLTS.
CONTROL (It is recommended that ECM 2.3 controls be used for all
8c. IF REPLACING
AN control
ECM 2.0
CONTROL
WITHtoAN
2.0
replacements),
the new
must
be attached
theECM
motor
using
CONTROL
(It identical
is recommended
ECM with
2.3 controls
be used
for all
through
bolts
to those that
removed
the original
control.
DO
replacements),
the new THE
control
must be attached to the motor using
NOT
OVERTIGHTEN
BOLTS.
through bolts identical to those removed with the original control. DO
9. Reinstall the blower/motor assembly into the HVAC equipment.
NOT OVERTIGHTEN THE BOLTS.
Follow the manufacturer's suggested procedures.
9.Reinstall the blower/motor assembly into the HVAC equipment.
10. Plug the 16-pin control plug into the motor. The plug is keyed.
Follow the manufacturer's suggested procedures.
Make sure the connector is properly seated and latched.
10. Plug the 16-pin control plug into the motor. The plug is keyed.
11. Plug the 5-pin power connector into the motor. Even though the
Make sure the connector is properly seated and latched.
plug is keyed, OBSERVE THE PROPER ORIENTATION. DO NOT
11. Plug THE
the 5-pin
power connector
into the
motor.
Even
though
FORCE
CONNECTOR.
It plugs
in very
easily
when
properly
the plug isREVERSING
keyed, OBSERVE
THE
PROPER
ORIENTATION.
DO NOT
oriented.
THIS
PLUG
WILL
CAUSE IMMEDIATE
FORCE
THE
CONNECTOR.
It
plugs
in
very
easily
when
properly
FAILURE OF THE CONTROL MODULE.
oriented. REVERSING THIS PLUG WILL CAUSE IMMEDIATE
12. Final installation check. Make sure the motor is installed as follows:
FAILURE OF THE CONTROL MODULE.
a. Unit is as far INTO the blower housing as possible.
12. Final
installation
sure the
motoror
is covering
installed vent
as holes.
b.Belly
bands arecheck.
not onMake
the control
module
follows:
c. Motor connectors should be oriented between the 4 o’clock and 8
a.o’clock
Unit is as
far INTO
the the
blower
housing
as possible.
positions
when
blower
is positioned
in its final
b.location
Belly bands
not on the control module or covering vent
and are
orientation.
holes.
d.Add
a drip loop to the cables so that water cannot enter the motor
c.by
Motor
connectors
should
be oriented
the 4 o’clock
draining
down the
cables.
Refer tobetween
Figure 26.
and 8 o’clock positions when the blower is positioned in its
The installation is now complete. Reapply the AC power to the HVAC
final location and orientation.
equipment and verify that the new motor control module is working
d.Add a drip loop to the cables so that water cannot enter the
properly. Follow the manufacturer's procedures for disposition of the old
motor by draining down the cables. Refer to Figure 30.
control module.
The installation is now complete. Reapply the AC power to the HVAC
equipment and verify that the new motor control module is working
properly. Follow the manufacturer's procedures for disposition of the
old control module.
Figure
28
Figure
24
Figure
3
Control Disassembly
Figure
Figure 29
Figure
425
Winding Test
Motor Connector
(3-pin)
Only remove
From Motor
Hex Head Bolts Push until
Latch Seats
Over Ramp
Circuit
Board
Motor
ECM 2.0
Motor OK when
R > 100k ohm
Note:
Use the shorter
bolts and
alignment pin
supplied when
replacing an
ECM 2.0
control.
Figure
Figure
26
Figure30
5
Drip Loop
Motor Connector
(3-pin)
ECM
2.3/2.5
Back of
Control
Connector Orientation
Between 4 and 8 o'clock
Control Connector
(16-pin)
Power Connector
(5-pin)
Hex-head Screws
Drip Loop
Manual2100-653A
Page
41 of 44
FAN BLADE SETTING DIMENSIONS
R-410A 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.
This unit was charged at the factory with the quantity
of refrigerant listed on the serial plate. AHRI capacity
and efficiency ratings were determined by testing with
this refrigerant charge quantity (see Table 8).
FIGURE 31
Fan Blade Setting
The following pressure tables show nominal
pressures for the units. Since many installation
specific situations can affect the pressure readings,
this information should only be used by certified
technicians as a guide for evaluating proper system
performance. They shall not be used to adjust charge.
If charge is in doubt, reclaim, evacuate and recharge
the unit to the serial plate charge.
TABLE 8
Subcooling at Liquid Line
TABLE 7
Fan Blade Dimensions
MODEL
DIMENSION A
(INCHES)
All
Q**H3D
Models
.750
MODEL
RATED
CFM
95°F OD
TEMPERATURE
82°F OD
TEMPERATURE
Q24H3D
800
23 - 25
22 - 24
Q30H3D
1000
23 - 25
23 - 25
Q36H3D
1200
19 - 21
17 - 19
Q43H3D
1200
16 - 18
15 - 17
Q48H3D
1400
19 - 21
19 - 21
Q60H3D
1550
22 - 24
22 - 24
TABLE 9
Indoor Blower Performance
Rated
ESP

Max. ESP

Rated CFM

Optional
CFM

Continuous
CFM
CFM @
Max. ESP
Dehum.
CFM
Q24H3D o
.10
0.5
800
N/A
800
700
800
Q30H3D
.15
0.8
1000
N/A
1000
910
1000
Q36H3D
.15
0.8
1200
1000
1000
1175
1000
Model
Q43H3D
.15
0.8
1200
1000
1000
1175
1000
Q48H3D
.15
0.8
1400
1100
1100
1175
1250
Q60H3D
.20
0.5
1550
1250
1100
1400
1250
NOTE: These units are equipped with a variable speed (ECM) indoor motor that automatically adjust itself to maintain approximately
the same rate of indoor airflow in both heating and cooling, dry and wet coil conditions and at both 230/208 or 460 volts.
jMaximum ESP (inches WC) shown is with 1" thick disposable filter (reduced by .2 for 2" filter).
kRated CFM for ducted applications – required for maximum performance rating. To obtain full CFM on models Q36H3D, Q43H3D, Q48H3D
and Q60H3D connect the pink jumper wire (provided) to terminal #G2 and #Y on the low voltage terminal block located in the circuit breaker
box.
lOptional 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.
mContinuous fan CFM is the total air being circulated during continuous fan mode.
nIndoor airflow during periods of high humidity when system is operating under control of optional humidistat for maximum humidity reduction.
oModel Q24H3D – when operating on 2nd stage heating the indoor air will increase to 1000 CFM.
Manual2100-653A
Page
42 of 44
TABLE 10
Cooling Pressure
(All Temperatures in Degrees F)
MODEL
Q24H3D
Q30H3D
Q36H3D
Q43H3D
Q48H3D
Q60H3D
RETURN
AIR
TEMP.
PRESSURE
75 DB
62 WB
 AIR TEMPERATURE ENTERING OUTDOOR COIL
75°
80°
85°
90°
95°
100°
105°
110°
115°
120°
Low Side
High Side
122
369
121
378
121
391
121
407
122
426
122
449
123
474
125
503
128
535
131
565
80 DB
67 WB
Low Side
High Side
130
378
129
388
129
401
129
417
130
437
131
460
132
486
134
516
137
549
140
579
85 DB
72 WB
Low Side
High Side
135
391
134
402
134
415
134
432
135
452
136
476
137
503
139
534
142
568
145
598
75 DB
62 WB
Low Side
High Side
129
337
129
358
130
378
131
401
132
425
133
449
135
475
136
502
137
530
138
559
80 DB
67 WB
Low Side
High Side
138
346
138
367
139
388
140
411
141
436
142
461
144
487
145
515
147
544
148
573
85 DB
72 WB
Low Side
High Side
143
358
143
380
144
402
145
425
146
451
147
477
149
504
150
533
152
563
153
593
75 DB
62 WB
Low Side
High Side
130
318
131
342
132
368
133
393
134
419
135
446
136
473
137
501
138
529
139
559
80 DB
67 WB
Low Side
High Side
139
326
140
351
141
377
142
403
143
430
144
457
145
485
147
514
148
543
149
573
85 DB
72 WB
Low Side
High Side
144
337
145
363
146
390
147
417
148
445
149
473
150
502
152
532
153
562
154
593
75 DB
62 WB
Low Side
High Side
125
332
126
354
127
377
128
402
129
428
131
456
132
486
134
517
135
549
137
583
80 DB
67 WB
Low Side
High Side
134
341
135
363
136
387
137
412
138
439
140
468
141
498
143
530
144
563
146
598
85 DB
72 WB
Low Side
High Side
139
353
140
376
141
401
142
426
143
454
145
484
146
515
148
549
149
583
151
619
75 DB
62 WB
Low Side
High Side
123
345
124
371
125
397
125
423
126
449
127
476
128
502
130
528
131
556
133
582
80 DB
67 WB
Low Side
High Side
132
354
133
381
134
407
134
434
135
461
136
488
137
515
139
542
140
570
142
597
85 DB
72 WB
Low Side
High Side
137
366
138
394
139
421
139
449
140
477
141
505
142
533
144
561
145
590
147
618
75 DB
62 WB
Low Side
High Side
122
353
122
375
123
398
124
421
125
446
127
471
128
497
130
525
132
552
133
581
80 DB
67 WB
Low Side
High Side
130
362
131
385
132
408
133
432
134
457
136
483
137
510
139
538
141
566
142
596
85 DB
72 WB
Low Side
High Side
135
375
136
398
137
422
138
447
139
473
141
500
142
528
144
557
146
586
147
617
Low side pressure ± 4 psig
High side pressure ± 10 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.
When the system is operating in the dehumidification mode, the suction pressure will be reduced by 4 to 8 psig and the discharge
pressure will be reduced by 19 to 22 psig.
Manual2100-653A
Page
43 of 44
TABLE 11
Heating Pressure
(All Temperatures in Degrees F)
MODEL
RETURN
AIR
PRESSURE
TEMP.
AIR TEMPERATURE ENTERING OUTDOOR COIL
0
5
10
15
20
25
30
35
40
45
50
55
60
Q24H3D
70
Low Side
High Side
35
273
42
284
49
295
56
307
62
318
69
329
76
340
83
351
89
362
96
374
103
385
110
396
116
407
Q30H3D
70
Low Side
High Side
39
286
43
290
48
295
53
301
59
308
65
317
72
326
80
336
88
347
96
360
106
373
115
388
126
403
Q36H3D
70
Low Side
High Side
16
168
26
194
36
217
46
238
56
257
65
274
73
288
82
301
89
311
97
318
104
324
111
328
117
329
Q43H3D
70
Low Side
High Side
24
300
34
295
44
293
54
294
63
296
71
301
78
308
85
317
91
328
97
342
102
358
106
376
110
396
Q48H3D
70
Low Side
High Side
19
250
29
264
38
277
47
290
55
302
63
313
71
324
79
335
86
345
93
355
99
364
105
373
111
381
Q60H3D
70
Low Side
High Side
24
247
32
258
40
269
48
279
56
289
63
298
70
307
76
315
83
232
89
330
95
337
100
344
105
350
TABLE 12
Dehumidification Relay Logic Board
Inputs to Board
NOTES
G
Y
Cooling Mode Unoccupied
1
X
X
Cooling Mode Occupied
1
X
X
B
W2
1st Stage Heating Occupied
2
X
X
X
2
X
X
X
2nd Stage Heating Occupied
3
X
X
X
X
3
X
X
X
X
Emergency Heat
X
Dehumidification Unoccupied
4
D
RAT
X
2nd Stage Heating Unoccupied
4
Outputs From Board
A1
X
1st Stage Heating Unoccupied
Dehumidification Occupied
E1
X
X
X
X
X
Fan Only Occupied
X
Fan Only Unoccupied
X
X
BK
YO
X
X
X
X
X
X
W
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5
X
X
X
A2
TWV
X
X
X
E1
X
X
5
X
RV
X
X
X
Dehumidification w/RAT Closed
G1
X
X
X
X
5
5
X
X
X
X
NOTES:
1. Cooling takes precedence over dehumidification. A cooling call will cancel dehumidification.
2. Dehumidification takes precedence over first stage heating.
3. A second stage heating call cancels dehumidification.
4. The relay logic board has a jumper on it to choose between full-time dehumidification and occupied dehumidification only. With
the jumper in the 1-2 position dehumidification is available full-time. With the jumper in the 2-3 position dehumidification is
available only when the room is occupied. The room is considered occupied when the A1 terminal is energized.
5. These outputs will be energized if the jumper is in the full time dehumidification position. They will be off if the jumper is in the occupied dehumidification only position.
Manual2100-653A
Page
44 of 44
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