INSTALLATION INSTRUCTIONS
WATER SOURCE HEAT PUMP
Models:
GV27S3AA GV38S3AA
GV51S3AA
GV61S3AA
GV71S3AA
MIS-2615
Earth Loop Fluid Temperatures 25° – 110°
Ground Water Temperatures 45° – 75°
BMC, Inc.
Bryan, Ohio 43506
Manual:2100-666A
Supersedes:2100-666
Date:7-11-17
Page
1 of 37
CONTENTS
Getting Other Informations and Publications... 3
General Information................................................ 4
Water Source Nomenclature.................................. 4
Heater Package Nomenclature............................... 8
Application and Location....................................... 9
General............................................................... 9
Shipping Damage................................................. 9
Application.......................................................... 9
Location.............................................................. 9
Ductwork............................................................. 9
Filter................................................................. 10
Condensate Drain............................................... 12
Piping Access to Unit.......................................... 12
Wiring Instructions................................................ 14
General............................................................. 14
Control Circuit Wiring.......................................... 14
Wall Thermostat................................................. 14
Thermostat Indicators......................................... 14
Emergency Heat Mode........................................ 14
Ground Loop
(Earth Coupled Water Loop Applications)......... 16
Circulation System Design................................... 16
Start Up Procedure for Ground Loop System......... 17
Ground Water (Well System Applications)........ 19
Water Connections.............................................. 19
Well Pump Sizing............................................... 19
Start Up Procedure for Ground Water System........ 21
Water Corrosion.................................................. 21
Remedies of Water Problems............................... 22
Lake and Pond Installations................................. 22
Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Unit Dimensions................................ 7
Field Conversion to Left-Hand
Return............................................ 10
Filter Rack – GV Models................... 12
Condensate Drain and Piping
Access to Unit................................. 13
Thermostat Wiring............................ 15
Circulation System Design................ 16
Temperature and Pressure
Measurement................................... 18
Performance Model DORFC-1
Flow Center..................................... 18
Performance Model DORFC-2
Flow Center..................................... 18
Water Connection Components.......... 20
Cleaning Water Coil.......................... 22
Lake and Pond Installation............... 23
Component Location........................ 26
Control Panel................................... 26
Refrigerant Flow Diagrams................ 27
Manual2100-666A
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Sequence of Operation.......................................... 24
Blower............................................................... 24
Part Load Cooling............................................... 24
Full Load Cooling............................................... 24
Part Load Heating (No Electric Heat).................... 24
Full Load Heating (No Electric Heat).................... 24
Supplementary Electric Heat............................... 24
Emergency Heat Mode........................................ 24
Geothermal Logic Control.................................... 24
High Pressure Switch.......................................... 25
Low Pressure Switch........................................... 25
Flow Switch....................................................... 25
Evaporator Condensation Overflow........................ 25
Under and Over Voltage Protection....................... 25
Intelligent Reset................................................. 25
Alarm Output..................................................... 25
Pressure Service Ports......................................... 25
System Start Up................................................. 25
Quick Reference Troubleshooting Chart................. 30
Service...................................................................... 31
Service Hints..................................................... 31
Unbrazing System Components............................ 31
Compressor Solenoid.......................................... 31
Troubleshooting GE Endura Pro Series Motors....... 32
Accessories.............................................................. 34
Add-On GVDM-26 Pump Module Kit.................... 34
General............................................................. 34
Installation........................................................ 34
Ground Source Heat Pump
Performance Report.......................................... 35
Wiring Diagram................................................. 37
Figure
Figure
Figure
Figure
Figure
16A
16B
17 18 19 Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Pressure Tables.................................. 28
Pressure Tables................................ 29
Motor Connections........................... 32
Motor Connections........................... 33
Typical Pump Kit Connection
to Unit............................................ 34
Indoor Blower Performance................. 4
Flow Rates for Various Fluids.............. 5
Specifications.................................... 5
Water Coil Pressure Drop.................... 6
Electrical Specifications – Optional
Field-Installed Heater Packages.......... 8
Air Filter Table................................. 11
Control Circuit Wiring....................... 14
Wall Thermostat............................... 14
Constant Flow Valves........................ 19
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help with installing the heat
pump. They can usually be found at the local library
or purchased directly from the publisher. Be sure to
consult the 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 Residential .........ACCA Manual J
Winter and Summer Air Conditioning
Duct Design for Residential............... ACCA Manual D
Winter and Summer Air Conditioning and Equipment
Selection
Closed-Loop/Ground Source Heat Pump.......... IGSHPA
Systems Installation Guide
Grouting Procedures for Ground-Source.......... IGSHPA
Heat Pump Systems
Soil and Rock Classification for...................... IGSHPA
the Design of Ground-Coupled Heat Pump Systems
Ground Source Installation Standards............. IGSHPA
Closed-Loop Geothermal Systems................... IGSHPA
– Slinky Installation Guide
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 Refrigerating, 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
IGSHPA
International Ground Source
Heat Pump Association
490 Cordell South
Stillwater, OK 74078-8018
Manual2100-666A
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GENERAL INFORMATION
WATER SOURCE PRODUCT LINE NOMENCLATURE
G
V
38
S
3
A
Revision
Level
Black
E-Coated
Air Coil
Ground
Source
A
Electrical 230/208V 1-Phase
Vertical
C
C = Copper Water Coil (Closed Loop)
N = Cupronickel
(Open Loop)
Step
Capacity
38 = Nominal heating capacity in thousands @ 50° water - Full Load
Nominal cooling capacity in thousands @ 77° brine - Full Load
TABLE 1
Indoor Blower Performance (Rated CFM) 
Speed #1
Speed #2
Speed #3
Speed #4
Speed #5
m
Continuous
Airflow
n
Mild Weather
Operation in 1st
Stage Cooling
Mode (5-Min.)
o
Part Load
Operation
Airflow
p
-10%
Full Load
Airflow
(Optional)
q
Full Load
Airflow and
Electric Heat
Mode
MODEL
Motor
HP
k
Rated
ESP
l
MAX
ESP
GV27S3
1/3
0.15
0.50
500
650
800
900
1000
GV38S3
1/2
0.15
0.50
650
725
900
1175
1300
GV51S3
1/2
0.20
0.50
750
925
1150
1350
1500
GV61S3
3/4
0.20
0.50
800
1050
1300
1450
1600
GV71S3
3/4
0.25
0.50
875
1150
1450
1575
1750
 Motor will automatically step through the various airflows with thermostatic control.
 ESP = External Static Pressure (inches of water)
 Maximum allowable duct static
 Continuous airflow is the CFM being circulated with manual fan operation without any additional function occurring.
 Will occur automatically for first 5 minutes of Part Load Cooling Operation.
 Will occur automatically after five minutes of Part Load Cooling Operation.
 This is a field option for noisy installations to de-rate Full Load airflow (requires change in control panel).
 Will occur automatically with control signal input (will not be defeated for electric heat operation).
Manual2100-666A
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TABLE 2A
Rated Flow Rates for Various Fluids
MODELS
Various Fluids
GV27S
GV38S
GV51S
GV61S
GV71S
Flow rate required GPM fresh water j
7
9
12
15
16
Flow rate required GPM 15% Sodium Chloride
7
9
12
15
16
Flow rate required GPM 25% GS4
7
9
12
15
16
 Rated Flow
TABLE 2B
Optional Ground Water Flow Rates
MODELS
Fresh Water
GV27S
GV38S
GV51S
GV61S
GV71S
5
6
7
9
10
Optional Pump-N-Dump Flow Rates
TABLE 3
Specifications
MODEL
GV27S3AA*
GV38S3AA*
GV51S3AA*
GV61S3AA*
GV71S3AA*
Electrical Rating (60HZ/1PH)
230/208-1
230/208-1
230/208-1
230/208-1
230/208-1
253-197
253-197
253-197
253-197
253-197
19
24
32
40
44
#12
#10
#8
#6
#6
30
40
50
60
70
230/208
230/208
230/208
230/208
230/208
7.5/8.6
12.0/13.65
15.8/17.6
21.9/24.2
26.3/28.9
11.7
15.3
21.2
27.2
29.7
58.3/58.3
83/83
104/104
152.9/152.9
179.2/179.2
1/3 / 5 / ECM
1/2 / 5 / ECM
1/2 / 5 / ECM
3/4 / 5 / ECM
3/4 / 5 / ECM
1.5 / 1.6
2.5 / 2.95
2.8 / 3.0
3.8 / 4.1
4.1 / 4.2
3.16 / 4 / 11
3.16 / 4 / 11
5.33 / 3 / 11
5.33 / 4 / 11
5.33 / 5 / 10
Operating Voltage Range
Minimum Circuit Ampacity j
+Field Wire Size j
Delay Fuse Max. or Ckt. Bkr. j
COMPRESSOR
Volts
Rated Load Amps 230/208
Branch Ckt. Selection Current
Lock Rotor Amps 230/208
BLOWER MOTOR AND EVAPORATOR
Blower Motor - HP/Speed/Type
Blower Motor - Amps
Face Area Sq. Ft./Row/Fins Per Inch
+75°C copper wire
* C - for copper / N for Cupronickel water coil
 Heat pump only. Optional field-installed heaters are separate circuit.
Manual2100-666A
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TABLE 4
Water Coil Pressure Drop
Model
GV27S3
GPM
PSID
Ft. Hd.
3
0.1
0.23
4
0.5
5
GV38S3 / GV51S3
PSID
Ft. Hd.
1.15
0.9
2.08
1.2
2.77
1.4
3.23
6
1.7
3.92
2.3
5.31
7
2.3
5.31
3.2
8
3.1
7.15
9
4.1
9.46
GV61S3
PSID
Ft. Hd.
7.38
2
4.61
4.1
9.46
2.5
5.1
11.77
10
6.1
11
GV71S3
PSID
Ft. Hd.
5.77
2
4.61
3.2
7.38
2.4
5.54
14.07
3.9
9.00
2.8
6.46
7.1
16.38
4.7
10.84
3.4
7.84
12
8.2
18.92
5.5
12.69
3.9
9.00
13
9.4
21.69
6.4
14.76
4.5
10.38
14
10.6
24.45
7.3
16.84
5.2
12.00
15
8.1
18.69
5.9
13.61
16
9
20.76
6.7
15.46
17
9.9
22.84
7.4
17.07
8.4
19.38
18
Manual2100-666A
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Manual2100-666A
Page
7 of 37
C
S
T
G
R
27
55-5/8
48
C
Height
17-7/8
13-7/8
D
CONDENSATE
DRAIN LOCATION
K
L
17-7/8
13-7/8
E
Flange
Supply
Duct
WATER
CONNECTIONS
SEE
NOTE A
LEFT SIDE VIEW
32-5/8
GV51-71S3
26
B
A
27-5/8
Depth
Width
GV27-38S3
Units
Q
G
29-7/8
22-3/4
H
F
I
2-7/16
2-7/16
D
A
FRONT VIEW
TOP VIEW
7
6-7/8
J
H
1-1/2
1-1/2
NOTE A: PANELS ARE REVERSIBLE ALONG WITH
CONTROL PANELS FOR HEAT PUMP AND
ELECTRIC HEATER PACKAGE FOR BEST
INSTALLATION POSITION.
P
O
N
M
23-1/2
18
F
Height
Return
Width
L
32-1/4
31-5/8
UNIT
ELECTRICAL
ENTRANCE
J
M
1-5/8
1-5/8
N
O
3-1/2
3-1/4
P
B
CONDENSATE
DRAIN LOCATION
SEE
NOTE A
SEE
NOTE A
SUPPLY AIR
E
R
29-3/4
29-1/16
RIGHT SIDE VIEW
2-1/2
2-1/4
WATER
CONNECTIONS
FLOW CENTER
ELECTRICAL
ENTRANCE
OPTIONAL
HEATER
PACKAGE
ELECTRICAL
ENTRANCE
LOW
VOLTAGE
ENTRANCE
52-7/8
45-1/4
K
FIGURE 1
Unit Dimensions
Q
T
I
S
G
R
8-1/16
8-3/16
C
S
19-5/16
19-1/2
T
Y
15-5/16
15-1/2
REFRIGERANT
LOW-SIDE
SERVICE PORT
REFRIGERANT
HIGH-SIDE
SERVICE PORT
CONDENSATE
DRAIN LOCATION
R
DOMESTIC HOT WATER
HEAT EXCHANGER
WATER CONNECTIONS
LOW
VOLTAGE
ENTRANCE
RETURN AIR
FILTER RACK
26-13/16
25-13/16
U
V
V
9-7/8
7-3/8
W
X
W
25-5/8
23-1/8
BACK VIEW
U
2-1/16
2-1/16
X
MIS-2616 A
Y
30-7/16
25-7/16
Y
1-5/16
1-1/4
HEATER PACKAGE NOMENCLATURE
EH
3
GSV
A
A
14
C
Circuit Breaker
Nominal KW
240/208-1-60
Modification
Code
3 = 3 Ton
5 = 5 Ton
Electric
Heater
Ground Source Vertical
TABLE 5
Electrical Specifications – Optional Field-Installed Heater Packages
For Use
with
Models
GV27S3AA
GV38S3AA
GV51S3AA
GV61S3AA
GV71S3AA
Heater
Package
Model No.
Heater
Package
Volts/Phase
60 HZ
AMPS
KW
BTU
AMPS
KW
BTU
EH3GSVA-A05C
240/208-1
18.8
4.5
15,345
16.3
3.38
EH3GSVA-A09C
240/208-1
37.5
9.0
30,690
32.5
EH3GSVA-A14C
240/208-1
56.3
13.5
46,035
EH5GSVA-A09C
240/208-1
37.5
9.0
EH5GSVA-A14C
240/208-1
56.3
EH5GSVA-A18C
240/208-1
75.0
Heater Amps, KW and
Capacity @ 240 Volts
Heater Amps, KW and
Capacity @ 208 Volts
Minimum
Circuit
Ampacity
Maximum
Circuit
Breaker
Field
Wire
Size+
11,525
23.5
25
10
6.75
23,018
46.9
50
8
48.7
10.13
34,543
70.4
80
4
30,690
32.5
6.75
23,018
46.9
50
8
13.5
46,035
48.7
10.13
34,543
70.4
80
4
18.0
61,380
64.9
13.5
46,035
98.3
100
3
+ Based on 75F copper wire. All wiring must conform to National Electrical Code (latest edition) and all local codes.
Manual2100-666A
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APPLICATION AND LOCATION
GENERAL
Units are shipped completely assembled and internally
wired, requiring only duct connections, thermostat
wiring, 230/208 volt AC power wiring and water
piping. The equipment covered in this manual is
to be installed by trained, experienced service and
installation technicians.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
heat pump system should be carefully read before
beginning the installation. Note particularly any tags
and/or labels attached to the equipment.
While these instructions are intended as a general
recommended guide, they do not in any way supersede
any national and/or local codes. Authorities having
jurisdiction should be consulted before the installation
is made.
SHIPPING DAMAGE
Upon receipt of the equipment, the carton should be
checked for external signs of shipping damage. If
damage is found, the receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent.
APPLICATION
Capacity of the unit for a proposed installation should
be based on heat loss calculations made in accordance
with methods of the Air Conditioning Contractors of
America. The air duct system should be sized and
installed in accordance with Standards of the National
Fire Protection Association for the Installation of
Air Conditioning and Venting systems of Other than
Residence Type NFPA No. 90A and Residence Type
Warm Air Heating and Air Conditioning Systems NFPA
No. 90B.
LOCATION
The unit may be installed in a basement, closet or
utility room provided adequate service access is
ensured. The unit is shipped from the factory as a
right-hand return and requires access clearance of
2' minimum to the access panels on this side of the
unit. If unit is to be field converted to left-hand return
the opposite side will require access clearance of 2'
minimum.
Unit may be field converted to left-hand return by
removing two (2) screws that secure the control panel
cover, removing four (4) screws that hold the control
panel in place, laying the control panel down, sliding it
under the blower and re-securing the control panel on
the opposite side of the unit (see Figure 2 on page 10).
The two access doors from the right-hand return can
be transferred to the left-hand return side and the one
left-hand panel can be transferred to the right-hand
side.
Unit casing suitable for 0" clearance with 1" duct
clearance for at least the first 3' of duct. These
units are not approved for outdoor installation and
therefore must be installed inside the structure being
conditioned. Do not locate in areas subject to freezing
in the winter or subject to sweating in the summer.
Before setting the unit, consider ease of piping, drain
and electrical connections for the unit. Also, for units
which will be used with a field-installed heat recovery
unit, consider the proximity of the unit to the water
heater or storage tank. Place the unit on a solid base,
preferably concrete, to minimize undesirable noise and
vibration. DO NOT elevate the base pan on rubber or
cork vibration eliminator pads as this will permit the
unit base to act like a drum, transmitting objectionable
noise.
DUCTWORK
If the unit is to be installed in a closet or utility room
which does not have a floor drain, a secondary drain
pan under the entire unit is highly recommended.
DO NOT install the unit in such a way that a direct
path exists between any return grille and the unit.
Rather, insure that the air entering the return grille will
make at least one turn before entering the unit or coil.
This will reduce possible objectionable compressor and
air noise from entering the occupied space.
Design the ductwork according to methods given by
the Air Conditioning Contractors of America. When
duct runs through unconditioned spaces, it should be
insulated with vapor barrier. It is recommended that
flexible connections be used to connect the ductwork
to the unit in order to keep the noise transmission to a
minimum.
WARNING
Failure to provide the 1" clearance between
the supply duct and a combustible surface
for the first 3' of duct can result in a fire.
Manual2100-666A
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FIGURE 2
Field Conversion to Left-Hand Return
2
1
3
Panel removed for clarity.
Does not need removed
to change control panel location.
MIS-2617
1. Remove control panel fill plate.
2. Remove two screws securing control panel to unit.
3. Pass control panel through blower section rotating 180°.
4. Re-secure control panel on opposite side in same manner
as originally attached.
5. Move double doors to control panel side of unit.
FILTER
This unit must not be operated without a filter. It
comes equipped with 2" disposable filters, which
should be checked often and replaced if dirty.
Insufficient airflow due to undersized duct systems or
dirty filters can result in nuisance tripping of the high
or low pressure controls. Refer to Table 1 on page 4 for
correct airflow and static pressure requirements.
NOTE: The filter rack is installed on the unit as shipped
for right-hand return. If left-hand return is required,
remove the filter access door and screws holding the
filter rack to the unit (slide downward from underneath
unit top). Invert the filter rack 180° to move filter
Manual2100-666A
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access door to the other side of the unit, and reverse
the previous steps (see Figure 3).
NOTE: The duct attachment flanges will need to be
bent up using duck bill pliers or similar device, as the
unit is shipped with them collapsed.
Air Filters
Model
Filter Size
Quantity
GV27S
GV38S
20" x 25" x 2"
1
GV51S
GV61S
GV71S
16" x 25" x 2"
2
Manual2100-666A
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To convert filter rack to left-hand access
first remove filter rack door and filters.
Filter rack shipped for
right-hand access from factory.
Drawing
filter models
Drawingshows
showsdual
dual air
air filter
GV51S3,
61S3,
71S3.
GV27S3, 38S3
models GV51S1,61S1,71S1.
have
only one air
filter.
GV27S1,38S1
have
only one air filter.
Front of Unit
Left-hand access filter
rack installed.
FIGURE 3
Filter Rack – GV Models
MIS-2618 A
installed location.
Remove all screws
holding filter rack frame
to unit. Rotate filter rack
frame 180°
Filter rack channel on GV51S3, 61S3,
Filter rack
on to
GV51S1,61S1,71S1
71S3
doeschannel
not need
be rotated. Leave
does
not
need
to
be
rotated.
in factory-installed location. Leave in factory
CONDENSATE DRAIN
PIPING ACCESS TO UNIT
Drain lines must be installed according to local
plumbing codes. It is not recommended that any
condensate drain line be connected to a sewer main.
Water piping to and from the unit enters the unit
cabinet on either side of the unit. The connection
directly at the unit is a special double O-ring fitting
with a retainer nut that secures it in place. (It is the
same style fitting used for the flow center connection
on ground loop applications.) Enter in and out either
side of the unit in any combination as the installation
dictates. One side has both connections closed off
with a double O-ring plug seal with retaining caps. One
or both of these can be transferred to the opposite side,
depending upon installation requirements.
Determine where the drain line will run and then select
one of four locations for the condensate to exit the
unit casing (see Figure 4). There are knockouts in the
unit casing that can be selected for the condensate
exit. Internal of the unit, there is a clear flexible hose
with a termination fitting installed. When installed
properly, this hose will create a trap internal of the unit
and will remain serviceable if the drain system requires
cleaning or service. Supplied in the parts bag of the
unit is a 3/4" PVC male adaptor that will secure the
internal drain components to the sheet metal casing at
the location selected.
NOTE: This drain line will contain cold water and must
be insulated to avoid droplets of water from condensing
on the pipe and dripping on finished floors or the
ceiling below the unit.
Manual2100-666A
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NOTE: All double O-ring fittings require “hand
tightening only”. Do not use wrench or pliers as
retainer nut can be damaged with excessive force.
NOTE: Apply petroleum jelly to O-rings to prevent
damage and aid in insertion.
Various fittings are available to connect to the unit with
various materials and methods. These methods include
1" barbed fittings (straight and 90°), 1" MPT (straight
and 90°), and 1-1/4" hot fusion fitting (straight only)
(see Figure 4).
FIGURE 4
Condensate Drain and Piping Access to Unit
Desuperheater
Pump module connections
1/2" I.D. copper stub
Water in connection
MIS-2619 A
Water out connection
Condensate drain
access (4) locations
SUCTION
SERVICE
CONNECTION
DISCHARGE
SERVICE
CONNECTION
Manual2100-666A
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WIRING INSTRUCTIONS
GENERAL
WALL THERMOSTAT
All wiring must be installed in accordance with the
National Electrical Code and local codes. In Canada,
all wiring must be installed in accordance with the
Canadian Electrical Code and in accordance with
the regulations of the authorities having jurisdiction.
Power supply voltage must conform to the voltage
shown on the unit serial plate. A wiring diagram of the
unit is attached to the inside of the electrical cover.
The power supply shall be sized and fused according to
the specifications supplied. A ground lug is supplied in
the control compartment for equipment ground.
The following thermostat should be used as indicated,
depending on the application.
The unit rating plate lists a maximum circuit breaker
or fuse 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.
CONTROL CIRCUIT WIRING
The minimum control circuit wiring gauge needed to
ensure proper operation of all controls in the unit will
depend on two factors.
1. The rated VA of the control circuit transformer.
2. The maximum total distance of the control circuit
wiring.
Table 6 should be used to determine proper gauge of
control circuit wiring required.
TABLE 6
Control Circuit Wiring
Rated VA of Control
Circuit Transformer
50
Transformer
Secondary FLA
@ 24V
Maximum Total
Distance of Control
Circuit Wiring in Feet
2.1
20 gauge – 45
18 gauge – 60
16 gauge – 100
14 gauge – 160
12 gauge – 250
Example:
1. Control circuit transformer rated at 50 VA
2. Maximum total distance of control circuit wiring
85'
Per Table 6, minimum of 16 gauge wire should be used
in the control circuit wiring.
Manual2100-666A
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TABLE 7
Wall Thermostat
Thermostat
8403-060
(1120-445)
Predominant Features
3 stage Cool; 3 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover
THERMOSTAT INDICATORS
8403-060 (1120-445) Temperature/Humidity Control:
In heating or cooling, the display may be black
and light gray, or backlit in blue depending on
configuration. In the event of a system malfunction
such as a loss of charge or high head pressure, the heat
pump control board will issue a signal to the thermostat
causing the screen to be backlit in RED and the display
to read “Service Needed”. If this occurs, the control
will continue to function, but adjustments will not be
able to be made until the problem is corrected and the
fault device is reset.
EMERGENCY HEAT MODE
The operator of the equipment must manually place the
system switch in this mode. This is done when there is
a known problem with the unit.
When the 8403-060 (1120-445) Temperature/
Humidity Control is placed in the Emergency Heat
mode, the display will be backlit in RED to indicate
that service is needed. The display will remain backlit
in red until the mode is switched out of Emergency
Heat.
FIGURE 5
Thermostat Wiring
GROUND LOOP APPLICATIONS (when utilized with a flow center)
8403-060 (1120-445)
(See notes 1 & 2 below)
C
R
G
Y1
Y2
O
W2
W1/E
L
Unit 24V terminal strip
C
R
G
Y1
Y2
O
W
E
L
A
D/YO
GROUND WATER APPLICATIONS (when installed with recommended motorized valve with end switch)
8403-060 (1120-445)
(See notes 1 & 2 below)
C
R
G
Y1
Y2
O
W2
W1/E
L
Unit 24V terminal strip
C
R
G
Y1
Y2
O
W
E
L
C
W/Y
ES
ES
A
D/YO
A
D/YO
Bard part # 8603-033
Motorized valve with end switch
(part of Bard GVGWK-1 Ground Water Kit)
GROUND WATER APPLICATIONS (when installed with standard 2-wire solenoid valve)
8403-060 (1120-445)
(See notes 1 & 2 below)
C
R
G
Y1
Y2
O
W2
W1/E
L
Unit 24V terminal strip
C
R
G
Y1
Y2
O
W
E
L
Bard part #8603-006
Solenoid valve
1. Will need to be programmed for multi-stage heat pump
2. Will need to be configured to energize reversing valve for cooling mode
3. All wiring field supplied low voltage
MIS-2620 D
Manual2100-666A
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15 of 37
GROUND LOOP
(EARTH COUPLED WATER LOOP APPLICATIONS)
NOTE: Unit shipped from factory with 60 PSIG low
pressure switch wired into control circuit and must
be rewired to 45 PSIG low pressure switch for ground
loop applications. This unit is designed to work on
earth coupled water loop systems, however, these
systems operate at entering water (without antifreeze)
temperature with pressures well below the pressures
normally experienced in water well systems.
of head loss in 1/2" or 3/4" household plumbing. A
closed loop earth coupled heat pump system, however,
is separated from the pressure of the household supply
and relies on a small, low wattage pump to circulate
the water and antifreeze solution through the earth
coupling, heat pump and equipment room components.
CIRCULATION SYSTEM DESIGN
Equipment room piping design is based on years of
experience with earth coupled heat pump systems.
The design eliminates most causes of system failure.
The heat pump itself is rarely the cause. Most
problems occur because designers and installers forget
that a ground loop “earth coupled” heat pump system
is NOT like a household plumbing system.
Most household water systems have more than
enough water pressure either from the well pump of
the municipal water system to overcome the pressure
The small circulator keeps the operating costs of the
system to a minimum. However, the performance
of the circulator MUST be closely matched with the
pressure of head loss of the entire system in order
to provide the required flow through the heat pump.
Insufficient flow through the heat exchanger is one of
the most common causes of system failure. Proper
system piping design and circulator selection will
eliminate this problem.
The equipment supplier may provide a worksheet to
simplify heat loss calculations and circulator selection.
Refer to “Circulating Pump Worksheet” section.
FIGURE 6
Circulation System Design
PIPE TO GROUND LOOP
PIPE FROM
GROUND LOOP
PUMP
MODULE
WATER IN
WATER OUT
STRAIGHT BARBED
BRASS ADAPTERS
NOTE: APPLY PETROLEUM JELLY
TO O-RINGS TO PREVENT DAMAGE
AND AID IN INSERTION.
OPTIONAL VISUAL
FLOW METER
NOTE: IF USED
SUPPORT WITH A
FIELD-FABRICATED
WALL BRACKET
HOSE CLAMPS
1" FLEXIBLE HOSE
Manual2100-666A
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MIS-2621 B
START UP PROCEDURE FOR GROUND
LOOP SYSTEM
NOTE: If a charge problem is determined (high or
low):
1. Be sure main power to the unit is OFF at
disconnect.
A. Check for possible refrigerant leaks.
B. Recover all remaining refrigerant from unit and
repair leak.
C. Evacuate unit down to 29" of vacuum.
D. Recharge the unit with refrigerant by weight.
This is the only way to ensure a proper charge.
2. Set thermostat system switch to OFF and fan
switch to AUTO.
3. Move main power disconnect to ON. Except as
required for safety while servicing, DO NOT OPEN
THE UNIT DISCONNECT SWITCH.
4. Check system airflow for obstructions.
A. Move thermostat fan switch to ON. Blower
runs.
B. Be sure all registers and grilles are open.
C. Move thermostat fan switch to AUTO. Blower
should stop.
5. Flush, fill and pressurize the closed loop system as
outlined.
6. Fully open the manual inlet and outlet valves.
Start the loop pump module circulator(s) and
check for proper operation. If circulator(s) are
not operating, turn off power and diagnose the
problem.
7. Check fluid flow using a direct reading flow meter
or a single water pressure gauge; measure the
pressure drop at the pressure/temperature plugs
across the water coil. Compare the measurement
with flow versus pressure drop table to determine
the actual flow rate. If the flow rate is too low, recheck the selection of the loop pump module
model for sufficient capacity. If the module
selection is correct, there is probably trapped air or
a restriction in the piping circuit.
8. Start the unit in cooling mode by moving the
thermostat switch to cool. Fan should be set for
AUTO.
9. Check the system refrigerant pressures against the
cooling refrigerant pressure table in the installation
manual for rated water flow and entering water
temperatures. If the refrigerant pressures do not
match, check for airflow problem then refrigeration
system problem.
10.Switch the unit to the heating mode by moving the
thermostat switch to heat. Fan should be set for
AUTO.
11.Check the refrigerant system pressures against the
heating refrigerant pressure table in installation
manual. Once again, if they do not match, check
for airflow problems and then refrigeration system
problems.
Manual2100-666A
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FIGURE
7 7
FIGURE
Temperature and Pressure Measurement
Thermometer
Thermometer
NOTE: Slide retaining cap back to expose
double o-rings. Apply petroleum jelly to o-rings
NOTE:
Slide damage
retainingand
capaid
back
to expose
to prevent
in insertion
double o-rings. Apply petroleum jelly to o-rings
to prevent damage and aid in insertion
Dial face pressure guage
with guage adaptor
Dial face pressure guage
with guage adaptor
30
40
30 50
40
20
50
60
60
70
70
90
90
10
20
100
0
10
Retaining cap, hand tighten only
80
80
110
Retaining cap, hand tighten only
100
110
120
120
0
Pete's
P/T test plug
P/T
Pete's test plug
Test plug cap
Test plug cap
Barbed 90° adapter
Barbed 90° adapter
MIS-2622 A
MIS-2622 A
FIGURE
8 8
FIGURE
Performance
Model
DORFC-1
FlowFLOW
CenterCENTER
PERFORMANCE MODEL DORFC-1
35
30
Head (Feet)
25
20
15
10
5
0
0
5
10
15
20
25
30
35
Flow (GPM)
FIGURE
9 9
FIGURE
Performance
Model
DORFC-2
FlowFLOW
CenterCENTER
PERFORMANCE MODEL DORFC-2
70
60
Head (Feet)
50
40
30
20
10
0
0
5
10
15
20
Flow (GPM)
Manual2100-666A
Manual 2100-545
Page
Page 1818ofof37
38
25
30
35
GROUND WATER
(WELL SYSTEM APPLICATIONS)
NOTE: It is highly recommended on ground water
systems (pump & dump) that a cupronickel coaxial coil
is utilized on the source side of the system. Not doing
so may void the product warranty due to aggressive/
corrosive/highly oxygenated water attacking a copper
coaxial water coil.
TABLE 8
Constant Flow Valves
Part No.
NOTE: Unit shipped from factory with 60 PSIG low
pressure switch wired into control circuit for open loop
applications.
WATER CONNECTIONS
It is very important that an adequate supply of clean,
non-corrosive water at the proper pressure be provided
before the installation is made. Insufficient water,
in the heating mode for example, will cause the low
pressure switch to trip, shutting down the heat pump.
In assessing the capacity of the water system, it is
advisable that the complete water system be evaluated
to prevent possible lack of water or water pressure
at various household fixtures whenever the heat
pump turns on. All plumbing to and from the unit
is to be installed in accordance with local plumbing
codes. The use of plastic pipe, where permissible,
is recommended to prevent electrolytic corrosion
of the water pipe. Because of the relatively cold
temperatures encountered with well water, it is strongly
recommended that the water lines connecting the unit
be insulated to prevent water droplets from condensing
on the pipe surface.
Refer to piping shown in Figure 10 on page 20. Slow
open/close with End Switch (2), 24V, provides on/
off control of the water flow to the unit. Refer to the
wiring diagram for correct hookup of the valve solenoid
coil.
Constant Flow Valve (3) provides correct flow of water
to the unit regardless of variations in water pressure.
Observe the water flow direction indicated by the arrow
on the side of the valve body. Table 8 shows which
valve is to be installed with which heat pump.
Strainer (8) installed upstream of water coil inlet to
collect foreign material which would clog the flow valve
orifice.
Figure 10 shows the use of shutoff valves (4) and (5)
on the in and out water lines to permit isolation of the
unit from the plumbing system should future service
work require this. Globe valves should not be used as
shutoff valves because of the excessive pressure drop
inherent in the valve design. Instead use gate or ball
valves as shutoffs to minimize pressure drop.
*
Min. Available
Pressure PSIG
Flow Rate
GPM
GFV-5
15*
5
GFV-6
15*)
6
GFV-7
15*
7
GFV-9
15*
9
GFV-10
15*
10
The pressure drop through the constant flow valve will vary
depending on the available pressure ahead of the valve.
Unless minimum of 15 psig is available immediately
ahead of the valve, no water will flow.
Hose bib (6) and (7) and tees should be included to
permit acid cleaning the refrigerant-to-water coil should
such cleaning be required. See WATER CORROSION
on page 21.
Hose bib (1) provides access to the system to check
water flow through the constant flow valve to insure
adequate water flow through the unit. A water meter is
used to check the water flow rate.
WELL PUMP SIZING
Strictly speaking, sizing the well pump is the
responsibility of the well drilling contractor. It is
important, however, that the HVAC contractor be
familiar with the factors that determine what size
pump will be required. Rule of thumb estimates will
invariably lead to under or oversized well pumps.
Undersizing the pump will result in inadequate water
to the whole plumbing system, but with especially bad
results to the heat pump—NO HEAT/NO COOL calls
will result. Oversized pumps will short cycle and could
cause premature pump motor or switch failures.
The well pump must be capable of supplying enough
water and at an adequate pressure to meet competing
demands of water fixtures. The well pump must be
sized in such a way that three requirements are met:
1. Adequate flow rate in GPM.
2. Adequate pressure at the fixture.
3. Able to meet the above from the depth of the wellfeet of lift.
The pressure requirements put on the pump are
directly affected by the diameter of pipe being used,
as well as, by the water flow rate through the pipe.
The worksheet included should guarantee that the
well pump has enough capacity. It should also ensure
Manual2100-666A
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that the piping is not undersized, which would create
too much pressure due to friction loss. High pressure
losses due to undersized pipe will reduce efficiency
and require larger pumps and could also create water
noise problems.
FIGURE 10
Water Connection Components
MIS-2623 A
8
7
6
5
4
3
See page 19 for descriptions
for these reference numbers
Manual2100-666A
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2
1
START UP PROCEDURE FOR GROUND
WATER SYSTEM
1. Be sure main power to the unit is OFF at disconnect.
2. Set thermostat system switch to OFF and fan switch
to AUTO.
3. Move main power disconnect to ON. Except as
required for safety while servicing, DO NOT OPEN
THE UNIT DISCONNECT SWITCH.
4. Check system airflow for obstructions.
Move thermostat fan switch to ON. Blower runs.
A.
B. Be sure all registers and grilles are open.
C. Move thermostat fan switch to AUTO. Blower
should stop.
5. Fully open the manual inlet and outlet valves.
6. Check water flow:
A. Connect a water flow meter to the drain cock
between the constant flow valve and the
solenoid valve. Run a hose from the flow meter
to a drain or sink. Open the drain cock.
B. Check the water flow rate through constant flow
valve to be sure it is the same as the unit is
rated for. (Example: 5 GPM for a GV27S3.)
C. When water flow is okay, close drain cock and
remove the water flow meter. The unit is now
ready to start.
7. Start the unit in cooling mode by moving thermostat
switch to cool. Fan should be set for AUTO. Check
to see the solenoid valve opened.
8. Check the system refrigerant pressures against the
cooling refrigerant pressure table in the installation
manual for rated water flow and entering water
temperatures. If the refrigerant pressures do not
match, check for airflow problem that refrigeration
system problem.
9. Switch the unit to the heat mode by moving
thermostat switch to heat. Fan should be set for
AUTO. Check to see the solenoid valve opened
again.
10.Check the refrigerant system pressures against the
heating refrigerant pressure table in installation
manual. Once again, if they do not match, check
for airflow problems and then refrigeration system
problems.
NOTE: If a charge problem is determined (high or low):
A. Check for possible refrigerant loss.
B. Discharge all remaining refrigerant from unit.
C. Evacuate unit down to 29" of vacuum.
D. Recharge the unit with refrigerant by weight.
This is the only way to ensure proper charge.
WATER CORROSION
Two concerns will immediately come to light when
considering a water source heat pump, whether for
ground water or for a ground loop application: Will
there be enough water? And, how will the water quality
affect the system?
Water quantity is an important consideration and one
which is easily determined. The well driller must
perform a pump down test on the well according
to methods described by the National Well Water
Association. This test, if performed correctly, will
provide information on the rate of flow and on the
capacity of the well. It is important to consider the
overall capacity of the well when thinking about a water
source heat pump because the heat pump may be
required to run for extended periods of time.
The second concern, about water quality, is equally
important. Generally speaking, if the water is not
offensive for drinking purposes, it should pose no
problem for the heat pump. The well driller or local
water softening company can perform tests which will
determine the chemical properties of the well water.
Water quality problems will show up in the heat pump
in one or more of the following ways:
1. Decrease in water flow through the unit.
2. Decreased heat transfer of the water coil (entering
to leaving water temperature difference is less).
There are four main water quality problems associated
with ground water:
1. Biological Growth. This is the growth of
microscopic organisms in the water and will show
up as a slimy deposit throughout the water system.
Shock treatment of the well is usually required
and this is best left up to the well driller. The
treatment consists of injecting chlorine into the
well casing and flushing the system until all growth
is removed.
2. Suspended Particles in the Water. Filtering will
usually remove most suspended particles (fine
sand, small gravel) from the water. The problem
with suspended particles in the water is that it will
erode metal parts, pumps, heat transfer coils, etc.
So long as the filter is cleaned and periodically
maintained, suspended particles should pose no
serious problem. Consult with the well driller.
3. Corrosion of Metal. Corrosion of metal parts
results from either highly corrosive water (acid
water, generally not the case with ground water) of
galvanic reaction between dissimilar metals in the
presence of water. By using plastic plumbing or
dielectric unions, galvanic reaction is eliminated.
The use of corrosion resistant materials such as
the Cupronickel coil) through the water system will
reduce corrosion problems significantly.
Manual2100-666A
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4. Scale Formation. Of all the water problems, the
formation of scale by ground water is by far the
most common. Usually this scale is due to the
formation of calcium carbonate but magnesium
carbonate or calcium sulfate may also be present.
Carbon dioxide gas (CO2), the carbonate of calcium
and magnesium carbonate, is very soluble in
water. It will remain dissolved in the water until
some outside factor upsets the balance. This
outside influence may be a large change in water
temperature or pressure. When this happens,
enough carbon dioxide gas combines with
dissolved calcium or magnesium in the water and
falls out of solution until a new balance is reached.
The change in temperature that this heat pump
produces is usually not high enough to cause the
dissolved gas to fall out of solution. Likewise, if
pressure drops are kept to a reasonable level, no
precipitation of carbon dioxide should occur.
The following is a list of recommendations to follow
when installing this type of system:
A. A lake or pond should be at least 1 acre (40,000
square feet) in surface area for each 50,000 BTUs
of ground water heat pump capacity or have two
times the cubic feet size of the dwelling to be
heated (includes basement if heated).
B. The average water depth should be at least 4' and
there should be an area where the water depth is
at least 12' to 15' deep.
FIGURE 11
Cleaning Water Coil
REMEDIES OF WATER PROBLEMS
Water Treatment
Water treatment can usually be economically justified
for water loop systems. However, because of the large
amounts of water involved with a ground water system,
water treatment is generally too expensive.
Acid Cleaning the Water Coil or Heat Pump Recovery Unit
If scaling of the coil is strongly suspected, the coil can
be cleaned up with a solution of phosphoric acid (food
grade acid). Follow the manufacturer’s directions for
mixing, use, etc. The acid solution can be introduced
into the heat pump coil through hose bib A (see Figure
11). Be sure the isolation valves are closed to prevent
contamination of the rest of the system by the coil.
The acid should be pumped from a bucket into the
hose bib and returned to the bucket through the other
hose bib B. Follow the manufacturer’s directions for
the product used as to how long the solution is to be
circulated, but it is usually circulated for a period of
several hours.
Hose Bib (B)
Isolation Valve
Hose Bib (A)
MIS-2624 A
Pump
LAKE AND POND INSTALLATIONS
Lakes and ponds can provide a low cost source of water
for heating and cooling with a ground water heat pump.
Direct usage of the water without some filtration is not
recommended as algae and turbid water can foul the
water to refrigerant heat exchanger. Instead, there have
been very good results using a dry well dug next to the
water line or edge. Normal procedure in installing a
dry well is to backhoe a 15' to 20' hole adjacent to
the body of water (set backhoe as close to the water’s
edge as possible). Once excavated, a perforated
plastic casing should be installed with gravel backfill
placed around the casing. The gravel bed should
provide adequate filtration of the water to allow good
performance of the ground water heat pump.
Manual2100-666A
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C. If possible, use a submersible pump suspended in
the dry well casing. Jet pumps and other types of
suction pumps normally consume more electrical
energy than similarly sized submersible pumps.
Pipe the unit the same as a water well system.
D. Size the pump to provide necessary GPM for the
ground water heat pump. A 12 GPM or greater
water flow rate is required on all models when used
on this type system.
E. A pressure tank should be installed in dwelling to
be heated adjacent to the ground water heat pump.
A pressure switch should be installed at the tank
for pump control.
F. All plumbing should be carefully sized to
compensate for friction losses, etc., particularly if
the pond or lake is over 200' from the dwelling to
be heated or cooled.
K. Locate the discharge high enough above high
water level so the water will not back up and freeze
inside the drain pipe.
L. Where the local conditions prevent the use of a
gravity drainage system to a lake or pond, run
standard plastic piping out into the pond below the
frost and low water level.
WARNING
G. Keep all water lines below low water level and
below the frost line.
H. Most installers use 4" field tile (rigid plastic or
corrugated) for water return to the lake or pond.
I. The drain line discharge should be located at least
100' from the dry well location.
J. The drain line should be installed with a slope of
2" per 10' of run to provide complete drainage of
the line when the ground water heat pump is not
operating. This gradient should also help prevent
freezing of the discharge where the pipe terminates
above the frost line.
Thin ice may result in the vicinity of the
discharge line.
For complete information on water well systems and
lake and pond applications, refer to manual from the
distributor.
FIGURE 12
Lake and Pond Installation
WELL CAP
ELECTRICAL LINE
PITLESS ADAPTER
TO PRESSURE
TANK
WATER
SUPPLY LINE
GRAVEL FILL
12’
to
15’
LAKE
or
POND
WATER LEVEL
DROP
PIPE
15’ to 20’
DEEP
PERFORATED
PLASTIC CASING
SUBMERSIBLE
PUMP
Manual2100-666A
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SEQUENCE OF OPERATION
BLOWER
Blower functions are all automatic through the
thermostat control. (See Table 1 for the specific
airflows on each speed.) Motor control inputs are all
24 VAC with line power to motor being continuous.
On a call for “G” from the thermostat (call for manual
fan), speed tap #1 on the blower motor is energized.
On a call for “Y1” from the thermostat (heating or
cooling), speed tap #2 of the blower motor is energized
immediately. Simultaneously, the “Y1” tap of the
blower control board is also energized, and following 5
minutes, the blower control will power speed tap #3 of
the blower motor.
compressor contactor and blower motor on speed tap
#2 initially, then speed tap #3 after 5 minutes (see
BLOWER above).
FULL LOAD HEATING (No Electric Heat)
The system should already be in part load heating
operation prior to full load heating being energized.
Additionally, the thermostat completes a circuit from
“R” to “Y2”. This sends a signal to both the staging
solenoid on the side of the compressor and energizes
either tap #5 or tap #4 of the blower motor (see
BLOWER above).
SUPPLEMENTARY ELECTRIC HEAT
On a call for “Y2” operation from the thermostat
(heating or cooling), speed tap #5 will be energized
through the blower control board. The exception is a
jumper pin connection on the blower control board. It
comes from the factory by default jumpering pins #4
and #5 together to run the blower at nominal rated full
load airflow. If this is too noisy, this jumper can be
removed from pins #4/#5 to allow the full load airflow
to be reduced by 10% (see unit wiring diagram).
The system should already be in full load heating
operation (above). The thermostat completes a circuit
from “R” to “W2”, which energizes up to 9 KW of
electric heat (depending on heater package installed).
9 KW of electric heat is the limit when operating with
the heat pump and is controlled through the emergency
heat relay.
On any call for “W” (electric heat operation) from the
thermostat, speed tap #5 is always energized. (It is
not affected by the #4/#5 jumper on the blower control
board.)
When thermostat system switch is placed in
EMERGENCY HEAT MODE and the thermostat calls for
heat, it completes a circuit from “R” to “E” and from
“R” to “W2”. This will energize the heater package for
all available KW per the installed heater package. (The
call from “R” to “E” locks out compressor operation.)
The blower motor is automatically energized with this
function and will run on speed #5 (see BLOWER
above).
PART LOAD COOLING
When thermostat system switch is placed in COOL,
it completes a circuit from “R” to “O”, energizing
the reversing valve solenoid. On a call for cooling,
the thermostat completes a circuit from “R” to “Y1”,
which energizes the compressor contactor and blower
motor on speed tap #2 initially, then speed tap #3 after
5 minutes (see BLOWER above).
FULL LOAD COOLING
The system should already be in part load cooling
operation prior to full load cooling being energized.
Additionally, the thermostat completes a circuit from
“R” to “Y2”. This sends a signal to both the staging
solenoid on the side of the compressor and energizes
either tap #5 or tap #4 of the blower motor (see
BLOWER above).
PART LOAD HEATING (No Electric Heat)
When thermostat system switch is placed in HEAT, the
reversing valve solenoid is no longer energized. On a
call for part load heating, the thermostat completes
a circuit from “R” to “Y1”, which energizes the
Manual2100-666A
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EMERGENCY HEAT MODE
GEOTHERMAL LOGIC CONTROL
If the controller operates in normal mode, the green Status
LED blinks. This indicates that 24 volt power is applied
to the board and the controller is running in normal
operation.
On initial power up and call for compressor operation, a
5-minute delay + a random start delay of 0 to 60-second
is applied. After the random delay, the compressor relay
is energized (terminals CC and CCG). When the “Y” input
opens, the compressor de-energizes.
Water Solenoid – When “Y” signal is sent to Geothermal
Logic Control, the water solenoid output “A” terminal
will energize 10 seconds prior to “CC” output that starts
compressor.
Anti-Short Cycle Timer – After compressor shutdown or
power disruption, a 5-minute timer is applied and prevents
the compressor from operating.
HIGH PRESSURE SWITCH
(Terminals HP1 and HP2) Circuit will be proved as
“closed” prior to energizing “A” or “CC” terminals. If
pressure switch opens, compressor will go into soft lockout
mode and compressor operation will be terminated; green
fault light illuminated. Logic control will then go through
5-minute delay on break + random start sequence. If no
fault found on next run cycle, compressor will continue
operation. If fault reoccurs, hard lockout occurs, and fault
signal is sent to “L” terminal.
LOW PRESSURE SWITCH
(Terminals LP1 and LP2) Circuit will be proved as
“closed” prior to energizing “A” or “CC” terminals. The
conditions of the LP terminals will then be ignored for
the first 90 seconds after a demand for compressor
operation. Following this 90-second period, if pressure
switch opens, compressor will go into soft lockout mode
and compressor operation will be terminated; orange fault
light illuminated. The control board will then go through
a 5-minute delay on break + random start sequence. If
no fault found on next run cycle, compressor will continue
operation. If fault reoccurs, hard lockout occurs, and fault
signal is sent to “L” terminal.
FLOW SWITCH
(Terminals FS and FS2) Circuit will be proved as “closed”
prior to energizing “CC” terminal. If flow switch opens,
compressor will go into soft lockout mode and compressor
operation will be terminated; red fault light illuminated.
Logic control will then go through 5-minute delay on
break + random start sequence. If no fault found on next
run cycle, compressor will continue operation. If fault
reoccurs, hard lockout occurs and fault signal is sent to
“L” terminal.
NOTE: Jumper wire is factory installed.
EVAPORATOR CONDENSATE
OVERFLOW
(Terminals CO and CO2) This input operates when the
water level in the evaporator pan rises and completes a
signal across the terminals of the terminal block located
in the indoor coil drain pan; yellow fault light illuminates.
If fault clears, the logic control will go through 5-minute
delay + random start. If fault reoccurs, or didn’t clear the
first time after 30 seconds, the control will go into hard
lockout, and will energize the “L” output signal.
10% from nominal voltage. All four (4) LED fault lights
will flash when an under or over voltage condition occurs.
The over voltage protection can be disabled by removing
the O/V jumper.
INTELLIGENT RESET
The Geothermal Logic Control has an intelligent reset
feature after a safety control is activated. The controller
locks out the unit for 5 minutes; at the end of this period,
the controller checks to verify that all faults have been
cleared. If faults have been cleared, the controller restarts
the unit. If a second fault occurs, the controller will lock
out the unit until the unit is manually reset by breaking
“Y” signal from thermostat. The last fault will be kept in
memory after a full lockout; this is only cleared by cycling
the power.
ALARM OUTPUT
The “L” terminal has 24 volts applied when a hard lockout
occurs. This can be used to drive a fault light or a low
voltage relay.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on
all units so that the system operating pressures can be
observed. Pressure tables can be found later in the
manual covering all models. It is imperative to match the
correct pressure table to the unit by model number.
SYSTEM START UP
Step 1 – Close disconnect switch(es) and set the
thermostat to cool and the temperature to the
highest setting.
Step 2 – Check for proper airflow across the indoor coil.
Step 3 – Connect the service gauges and allow the unit to
run for at least 10 minutes or until pressures are
stable. Check pressures to the system pressure
table attached to the unit service panel.
Step 4 – Fill out Ground Source Heat Pump Performance
Report.
UNDER AND OVER VOLTAGE
PROTECTION
When an under or over voltage condition exists, the
controller locks out the unit. When condition clears,
the controller automatically releases the unit to normal
operation and the compressor restarts after the random
start and anti-short cycle timings are met. The under and
over voltage protection starts at plus or minus 20% from
nominal voltage and returns to operation at plus or minus
Manual2100-666A
Page
25 of 37
FIGURE 13
Component Location
LOW PRESSURE SWITCHES
EXPANSION VALVE
SUCTION SERVICE PORT
DISCHARGE SERVICE PORT
DESUPERHEAT COIL
HIGH VOLTAGE IN
FLOW CENTER
POWER
COMPRESSOR
WATER COIL
HIGH PRESSURE SWITCH
REVERSING VALVE
MIS-2625
FIGURE 14
Control Panel
TERMINAL
BLOCK
GROUND
BLOCK
CIRCUIT
BREAKER
TRANSFORMER
GEOTHERMAL LOGIC
CONTROL MODULE
RELAY
E. HEAT
PLUG
TERMINAL
STRIP
MIS-3858
COMPRESSOR
CONTACTOR
Manual2100-666A
Page
26 of 37
COMPRESSOR
CAPACITOR
BLOWER CONTROL
FIGURE 15
Refrigerant Flow Diagrams
Manual2100-666A
Page
27 of 37
Manual2100-666A
Page
28 of 37
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
Low Side
High Side
75° DB
62° WB
80° DB
67° WB
85° DB
72° WB
75° DB
62° WB
80° DB
67° WB
85° DB
72° WB
Return Air
Temperature
70° DB
70° DB
Model
GV27S3
GV38S3
GV38S3
GV27S3
Pressure
-47
254
Low Side
High Side
5°F
Low Side
High Side
Pressure
119
134
111
129
104
126
119
121
111
117
104
114
30°F
52
215
Low Side
High Side
Return Air
Temperature
--
5°F
116
154
108
149
101
145
128
143
119
138
111
135
30°F
Low Side
High Side
Model
Low Side
High Side
85° DB
72° WB
70° DB
Low Side
High Side
80° DB
67° WB
GV38S3
Low Side
High Side
75° DB
62° WB
70° DB
Low Side
High Side
85° DB
72° WB
GV27S3
Low Side
High Side
80° DB
67° WB
Pressure
Low Side
High Side
75° DB
62° WB
Return Air
Temperature
Pressure
Return Air
Temperature
Model
GV38S3
GV27S3
Model
54
261
50
258
10°F
124
149
115
144
108
140
125
138
116
133
109
130
35°F
58
228
49
265
10°F
120
170
112
164
104
160
132
159
123
153
115
150
35°F
62
269
59
265
15°F
129
164
120
159
112
155
130
154
121
149
113
146
40°F
64
241
58
274
15°F
124
185
115
179
108
175
135
175
126
169
118
165
40°F
69
276
68
273
20°F
133
180
124
174
116
169
136
171
126
165
118
161
45°F
70
255
66
282
20°F
128
201
119
194
111
189
139
191
130
184
121
180
45°F
77
284
77
280
25°F
138
195
129
189
120
184
141
188
132
182
123
177
50°F
75
268
75
291
25°F
132
216
123
209
115
204
143
206
133
200
124
195
50°F
139
247
130
239
121
233
151
238
140
230
131
224
60°F
143
263
133
254
125
248
154
254
144
246
134
239
65°F
147
278
137
269
128
262
158
270
147
261
137
254
70°F
149
300
139
290
129
283
159
292
148
282
138
275
75°F
151
322
140
311
131
304
160
314
149
304
139
296
80°F
152
344
142
333
132
324
161
336
150
325
140
317
85°F
87
294
92
308
35°F
93
308
100
316
40°F
98
321
109
325
45°F
104
334
117
333
50°F
112
343
125
343
55°F
121
352
134
353
60°F
148
226
137
218
128
213
152
221
142
214
133
208
60°F
152
241
142
233
132
227
158
238
147
230
137
224
65°F
157
257
146
248
137
242
163
255
152
246
142
240
70°F
158
278
147
269
138
262
164
276
153
267
143
260
75°F
160
299
149
289
139
282
166
298
154
288
144
280
80°F
161
321
150
310
140
302
167
319
155
309
145
301
85°F
84
291
86
287
30°F
92
299
95
294
35°F
99
306
104
302
40°F
107
314
113
309
45°F
114
321
122
316
50°F
123
329
131
325
55°F
131
337
140
334
60°F
PART LOAD HEATING — Fluid Temperature Entering Water Coil °F
143
210
133
203
124
198
147
205
137
198
128
193
55°F
PART LOAD COOLING — Fluid Temperature Entering Water Coil °F
81
281
83
299
30°F
FULL LOAD HEATING — Fluid Temperature Entering Water Coil °F
136
232
126
224
118
218
147
222
137
215
128
210
55°F
FULL LOAD COOLING — Fluid Temperature Entering Water Coil °F
FIGURE 16A Pressure Tables
140
345
149
342
65°F
163
342
151
331
141
322
168
341
156
329
146
321
90°F
129
361
142
363
65°F
154
366
143
354
134
345
162
358
151
346
141
338
90°F
148
353
158
351
70°F
164
364
153
351
143
343
169
362
157
350
147
341
95°F
137
370
150
373
70°F
155
388
145
375
135
365
163
381
152
368
142
358
95°F
157
361
167
360
75°F
166
385
154
372
144
363
170
384
158
371
148
362
100°F
145
379
158
383
75°F
157
410
146
396
137
386
164
403
153
389
143
379
100°F
165
369
176
369
80°F
167
406
155
393
145
383
171
406
159
392
149
382
105°F
154
388
167
393
80°F
159
432
148
417
138
407
166
425
154
410
144
400
105°F
174
377
185
377
85°F
168
428
157
413
146
403
172
427
160
413
150
402
110°F
162
397
175
403
85°F
160
454
149
438
139
427
167
447
155
432
145
421
110°F
FIGURE 16B Pressure Tables
FULL LOAD COOLING — Fluid Temperature Entering Water Coil °F
Return
Air
Temp.
Pressure
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
70°F
75°F
80°F
85°F
90°F
95°F
100°F
105°F
110°F
75° DB
62° WB
Low Side
High Side
104
141
106
157
109
173
112
189
115
205
117
221
120
236
123
252
125
268
127
289
128
309
129
330
130
351
132
371
133
392
134
413
135
433
80° DB
67° WB
Low Side
High Side
111
145
114
161
117
178
120
194
123
210
125
226
128
243
131
259
134
275
135
296
137
317
138
339
139
360
141
381
142
402
143
423
145
444
85° DB
72° WB
Low Side
High Side
119
150
122
167
126
184
129
201
132
217
135
234
138
251
141
268
144
285
145
307
147
328
148
350
150
372
151
394
153
416
154
438
156
460
75° DB
62° WB
Low Side
High Side
108
143
110
160
112
176
114
192
116
208
118
224
120
241
122
257
123
273
125
293
126
314
127
334
128
354
130
375
131
395
132
415
133
436
80° DB
67° WB
Low Side
High Side
116
147
118
164
120
180
122
197
124
214
126
230
128
247
130
263
132
280
133
301
135
322
136
343
137
363
139
384
140
405
141
426
143
447
85° DB
72° WB
Low Side
High Side
125
152
127
169
129
187
131
204
133
221
135
238
138
255
140
273
142
290
143
311
145
333
146
354
148
376
149
398
151
419
152
441
153
462
75° DB
62° WB
Low Side
High Side
110
175
111
186
112
197
113
209
115
220
116
231
117
243
118
254
119
265
119
286
119
307
120
328
120
348
120
369
121
390
121
411
121
432
80° DB
67° WB
Low Side
High Side
118
179
119
191
120
202
121
214
123
226
124
237
125
249
126
260
127
272
127
293
128
315
128
336
128
357
129
379
129
400
129
421
130
443
85° DB
72° WB
Low Side
High Side
127
185
128
197
129
209
130
221
132
233
133
245
134
257
135
269
137
282
137
304
137
326
138
348
138
370
138
392
139
414
139
436
139
458
Model
Return
Air
Temp.
Pressure
5°F
10°F
15°F
20°F
25°F
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
70°F
75°F
80°F
85°F
GV51S3
70° DB
Low Side
High Side
--
--
50
291
58
300
65
308
73
317
81
326
89
335
96
343
104
352
113
363
123
374
132
385
141
396
150
407
160
418
169
429
GV61S3
70° DB
Low Side
High Side
--
45
283
53
294
61
305
69
315
77
326
85
337
93
348
101
358
109
369
118
382
127
395
136
408
145
421
154
434
163
447
172
460
GV71S3
70° DB
Low Side
High Side
--
45
268
52
278
59
287
66
297
73
306
80
316
87
325
94
335
101
344
111
355
121
366
131
376
141
387
151
398
161
409
171
419
Model
Return
Air
Temp.
Pressure
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
70°F
75°F
80°F
85°F
90°F
95°F
100°F
105°F
110°F
75° DB
62° WB
Low Side
High Side
106
127
109
142
112
157
115
172
119
187
122
202
125
217
129
233
132
248
133
268
135
288
136
308
137
328
139
348
140
369
142
389
143
409
80° DB
67° WB
Low Side
High Side
113
130
117
146
120
161
124
177
127
192
131
208
134
223
138
239
141
254
143
275
144
295
146
316
147
337
149
357
150
378
152
399
153
419
85° DB
72° WB
Low Side
High Side
121
135
125
151
129
167
133
183
137
199
140
215
144
231
148
247
152
263
153
284
155
306
156
327
158
348
160
370
161
391
163
413
164
434
75° DB
62° WB
Low Side
High Side
108
136
111
150
114
165
117
179
120
194
123
209
126
223
129
238
132
253
133
273
134
293
135
312
136
332
137
352
138
372
139
392
141
412
80° DB
67° WB
Low Side
High Side
115
139
118
154
122
169
125
184
128
199
131
214
135
229
138
244
141
259
142
280
143
300
145
321
146
341
147
362
148
382
149
403
150
423
85° DB
72° WB
Low Side
High Side
124
144
127
159
131
175
134
190
138
206
141
221
145
237
148
253
152
268
153
289
154
311
155
332
157
353
158
374
159
395
160
417
162
438
75° DB
62° WB
Low Side
High Side
108
139
111
153
113
167
115
181
117
195
119
209
121
223
123
237
125
251
127
271
128
291
129
312
130
332
132
352
133
372
134
393
135
413
80° DB
67° WB
Low Side
High Side
116
143
118
157
121
172
123
186
125
200
127
214
130
229
132
243
134
257
135
278
137
299
138
320
139
340
141
361
142
382
143
403
145
424
85° DB
72° WB
Low Side
High Side
125
148
127
163
130
178
132
192
134
207
137
222
139
236
142
251
144
266
145
288
147
309
148
331
150
352
151
374
153
395
154
417
156
438
Model
Return
Air
Temp.
Pressure
GV51S3
70° DB
GV61S3
GV71S3
Model
GV51S3
GV61S3
GV71S3
GV51S3
GV61S3
GV71S3
FULL LOAD HEATING — Fluid Temperature Entering Water Coil °F
PART LOAD COOLING — Fluid Temperature Entering Water Coil °F
PART LOAD HEATING — Fluid Temperature Entering Water Coil °F
5°F
10°F
15°F
20°F
25°F
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
70°F
75°F
80°F
85°F
Low Side
High Side
--
49
264
57
273
65
281
73
290
81
298
89
307
97
315
105
324
113
332
123
342
132
351
142
361
151
370
161
380
170
389
180
399
70° DB
Low Side
High Side
--
49
261
58
271
66
281
75
291
83
301
92
311
100
321
109
331
117
341
126
351
135
362
144
372
153
382
162
392
171
403
180
413
70° DB
Low Side
High Side
--
47
258
55
267
64
277
72
286
80
295
88
304
97
314
105
323
113
332
123
341
132
351
142
360
151
369
161
378
170
388
180
397
LOW SIDE PRESSURE +/- 2 PSIG
HIGH SIDE PRESSURE +/- 5 PSIG
Tables based upon rated CFM (airflow) across the evaporator coil.
If incorrect charge suspected (more than +2 psig suction, +5 psig liquid), it is recommended refrigerant charge be reclaimed, system evacuated and charged
to serial plate quantity.
Manual2100-666A
Page
29 of 37
Loose Terminals
Faulty Wiring
Blown Fuse or Tripped Breaker
Power Failure
Low Voltage
Compressor Overload
Start Capacitor
Run Capacitor
Potential Relay
Thermostat
Low Voltage
Control Transformer
Loose Terminals
Faulty Wiring
Indoor Blower Relay
Discharge Line Hitting Inside of Shell
Contactor Coil
Excessive Operation Costs
Ice in Water Coil
Aux. Heat on I.D. Blower Off
Liquid Refrigerant Flooding Back
To Compressor
Reversing Valve Does Not Shift
Compressor Runs Continuously
– No Cooling
Liquid Refrigerant Flooding Back
To Compressor
Compressor Runs Continuously
– No Heating
Excessive Water Usage
High Compressor Amps
I.D. Coil Frosting or Icing
I.D. Blower Will Not Start
Suction Pressure Too Low
Motor Wingings Defective
Refrigerant Charge Low
Refrigerant Overcharge
Low Head Pressure
High Suction Pressure
Low Suction Pressure
Non-Condensables
Unequalized Pressures
Solenoid Valve Stuck Closed (Htg)
Solenoid Valve Stuck Closed (Clg)
Solenoid Valve Stuck Open (Htg or Clg)
Leaking
Plugged or Restricted Metering Device (Htg)
Water Coil
Scaled or Plugged Coil (CLg)
Water Volume Low (Htg)
Water Volume Low (Clg)
Scaled or Plugged Coil (Htg)
Rev.
Valve
Defective Valve or Coil
WATER COIL SECTION
Water
Solenoid
Refrigerant System
High Head Pressure
Pressure Controls (High or Low)
Compressor
Bearings Defective
Suction Pressure Too High
Control Circuit
Seized
Defective Contacts in Contactor
POWER SUPPLY
Air Volume Low
Motor Winding Defective
Fins Dirty or Plugged
Plugged or Restricted Metering Device (Clg)
Air Filters Dirty
Undersized or Restricted Ductwork
INDOOR SECTION
AUX.
Indoor Blower Motor
and Coil
Heat Gen.
Auxillary Heat Upstream of Coil
Line Voltage
Low Water Temperature (Htg)
QUICK
REFERENCE
TROUBLESHOOTING
CHART CHART
FOR WATER
AIR HEAT
QUICK
REFERENCE
TROUBLESHOOTING
FORTO
WATER
TOPUMP
AIR HEAT PUMP
Valve Defective
Head Pressure Too Low
Head Pressure Too High
Compressor Noisy
Thermostat Check Light
Lite-Lockout Relay
Compressor Off on High
Pressure Control
Compressor Off on Low
Pressure Control
Compressor Cycles on Overload
Compressor Will Not Run
No Power at Contactor
Compressor Will Not Run
Power at Contactor
Compressor "Hums"
But Will Not Start
Denotes common cause
Denotes occasional cause
Heating or Cooling Cycles
Cooling
Cycle
Manual 2100-537N
Page
46 of 54
Heating Cycle
Manual 2100-537G
Manual2100-666A
Page
44 of 52
Page
30 of 37
SERVICE
SERVICE HINTS
COMPRESSOR SOLENOID
1. Caution owner to maintain clean air filters at all
times and to not needlessly close off supply and
return air registers. This reduces airflow through
the system, which shortens equipment service life
as well as increasing operating costs.
(See Sequence of Operation on pages 24 and 25
for function.) A nominal 24-volt direct current coil
activates the internal compressor solenoid. The input
control circuit voltage must be 18 to 28 volt ac.
The coil power requirement is 20 VA. The external
electrical connection is made with a molded plug
assembly. This plug contains a full wave rectifier to
supply direct current to the unloader coil.
2. Check all power fuses or circuit breakers to be sure
that they are the correct rating.
UNBRAZING SYSTEM COMPONENTS
If the refrigerant charge is removed from a scroll
equipped unit by bleeding the high side only, it is
sometimes possible for the scrolls to seal, preventing
pressure equalization through the compressor. This
may leave low side shell and suction line tubing
pressurized. If the brazing torch is then applied to
the low side while the low side shell and suction line
contains pressure, the pressurized refrigerant and oil
mixture could ignite when it escapes and contacts
the brazing flame. To prevent this occurrence, it is
important to check both the high and low side with
manifold gauges before unbrazing.
This unit is equipped with an ECM motor. 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.
Compressor Solenoid Test Procedure – If it is suspected
that the unloader is not working, the following methods
may be used to verify operation.
1. Operate the system and measure compressor
amperage. Cycle the compressor solenoid on
and off at 10-second intervals. The compressor
amperage should go up or down at least 25%.
2. If Step 1 does not give the expected results, shut
unit off. Apply 18 to 28 volt ac to the solenoid
molded plug leads and listen for a click as the
solenoid pulls in. Remove power and listen for
another click as the solenoid returns to its original
position.
3. If clicks can’t be heard, shut off power and
remove the control circuit molded plug from
the compressor and measure the solenoid coil
resistance. The resistance should be 32 to 60
ohms depending on compressor temperature.
4. Next, check the molded plug.
WARNING
Both the high and low side of the scroll
compressor must be checked with
manifold gauges before unbrazing system
components. Failure to do so could cause
pressurized refrigerant and oil mixture to
ignite if it escapes and contacts the brazing
flame causing property damage, bodily harm
or death.
CAUTION
Voltage check: Apply control voltage to the plug wires
(18 to 28 volt ac). The measured dc voltage at the
female connectors in the plug should be around 15 to
27 vdc.
Resistance check: Measure the resistance from the end
of one molded plug lead to either of the two female
connectors in the plug. One of the connectors should
read close to 0 ohms, while the other should read
infinity. Repeat with other wire. The same female
connector as before should read zero, while the other
connector again reads infinity. Reverse polarity on the
ohmmeter leads and repeat. The female connector
that read infinity previously should now read close to 0
ohms.
Replace plug if either of these test methods does not
show the desired results.
Do not plug in or unplug blower motor
connectors while the power is on. Failure
to do so may result in motor failure.
Manual2100-666A
Page
31 of 37
TROUBLESHOOTING GE ENDURA PRO
SERIES ECM MOTORS
If the Motor Is Running
the range as listed on the unit serial plate. If
higher than allowed, additional duct work is
needed.
E. If the motor does not shut off at the end of the
cycle, wait
for any programmed
delays to time
1. It is normal for the motor to rock back and
forth X13-SERIES
™ MOTORS
TROUBLESHOOTING
GE
ECM2.3
out (no more than 90 seconds). Also make
on start up. Do not replace the motor if this is the
there is no call
for “Continuous
Fan”
onlyBard
problem
identified.
NOTE:
Models
PA13242; PA13302; PA13362-A, -B; PA13422-A,sure
-B, that
-C; PA13482-A,
-B, -C;
PA13602-A, -B,
-C
on
the
“G”
terminal.
contain
the
X13-Series
Motors.
2. If the system is excessively noisy, does not appear
If thetoMotor
Running
changeis speeds
in response to a demand (Heat,
1. Cool,
It is normal
for or
theis
motor
to rock
back and forth
on start
Other)
having
symptoms
during
theup.
Do not replace the motor if this is the only problem identified.
cycle such as tripping limit or freezing coil, check
2. If the system is excessively noisy, does not appear to change
the following:
speeds in response to a demand (Heat, Cool, Other), or is having
symptoms
the cycle
such as tripping
limit
freezing
A. during
Wait for
programmed
delays
to ortime
out.coil,
check the following:
a.
WaitEnsure
for programmed
to time
out. inputs are
B.
that thedelays
motors
control
b.Ensure
thatas
theshown
motors control
are wired to thewiring
factory
wired
in the inputs
factory-supplied
supplied wiring diagram to insure motor is getting proper
diagram to ensure motor is getting proper
control signals and sequencing.
control
signals
and sequencing.
c. Remove
the filter
and check
that all dampers, registers, and
grilles are open and free flowing. If removing the filters
C. Remove the filter and check that all dampers,
corrects the problem, clean or replace with a less restrictive
registers
andand
grilles
areblower
open wheel
and free
filter.
Also check
clean the
or coilflowing.
as
If removing the filters corrects the problem,
necessary.
d.Check
the external
staticwith
pressure
(totalrestrictive
of both supply
and
clean
or replace
a less
filter.
return)
insure that
are within
the ranges
as listed
the
Alsoto check
andyouclean
the blower
wheel
or on
coil
unitas
serial
plate. If higher than allowed, additional duct work
necessary.
is needed.
D. Check the external static pressure (total of
both supply and return) to ensure it is within
e.
does not
shut off at thedo
end
of the
cycle,
F.If the
If motor
the above
diagnostics
not
solve
thewait for
any programmed delays to time out (no more than 90
problem,
confirm
the
voltage
checks
in
seconds). Also make sure that there is no call for
the nextFan”
section
then continue with
“Continuous
on thebelow,
"G" terminal.
the
“Model
Endura
Prosolve
Communication
f. If the
above
diagnostics
do not
the problem, confirm the
voltage
checks in the next section below, then continue with
Diagnostics”.
the “Model X13 Communication Diagnostics”.
If the Motor Is Not Running
If the Motor is Not Running
1.1. Check
forproper
proper
voltage
and at
ground
at the
Check for
highhigh
voltage
and ground
the (L/L1)
(G) (N/
(L/L1) (G)at (N/L2)
the motor
(see
L2) connections
the motorconnections
(see Figure 10).at Correct
any voltage
issuesFigure
before proceeding
to the any
next step.
Theissues
X13 Motor
is voltage
17). Correct
voltage
before
specific.
Only the correct
applied
to thePro
proper
proceeding
to thevoltage
next should
step. be
The
Endura
motor
motor. Input voltage within plus or minus 10% of the nominal 230
is
voltage
specific.
Only
the
correct
voltage
should
VAC is acceptable.
be applied to the proper motor. Input voltage
2. If the motor has proper high voltage and ground at the (L/L1)
within
plus or minus
10% with
of the
230 VAC
(G) (N/L2)
connections,
then continue
the nominal
“Model X13
is acceptable.
Communication
Diagnostics”.
2. If the motor has proper high voltage and ground at
the (L/L1) (G) (N/L2) connections, then continue
with the “Model Endura Pro Communication
Diagnostics”.
FIGURE 17
Motor Connections
FIGURE 10
230VAC
LINE2
GROUND
230VAC
LINE1
↓
↓
L2 LINE
POWER
EARTH
GROUND
L1 LINE
POWER
NOTE: MOTOR IS CONSTANTLY
POWERED BY LINE VOLTAGE
Manual2100-666A
Page
32 of 37
Model X13 Communication Diagnostics
The X13 motor is communicated through 24 VAC low voltage
(Thermostat Control Circuit Wiring).
Endura
Pro Communication
Diagnostics
1.Model
Start with
unit wiring
diagram to confirm
proper
connections and voltage (see Figure 11).
The Endura Pro motor is communicated through 24
VAC low voltage (Thermostat Control Circuit Wiring).
1. Start with unit wiring diagram to confirm proper
connections and voltage (see Figure 18).
2. Initiate a demand from the thermostat and
check the voltage between the common and the
appropriate motor terminal (1-5). (“G” input
is typically on terminal #1, but refer to wiring
diagram!)
2. Initiate a demand from the thermostat and check the
voltage between the common and the appropriate motor
terminal (1-5). ("G" input is typically on terminal #1, but
refer
wiring
diagram!)
toA.
If the
low voltage communication is not
a. If thepresent,
low voltage
communication
not present,
check
the demandisfrom
the check
the demand
from the
thermostat.
Also
checkterminal
the
thermostat.
Also
check the
output
output terminal and wire(s) from the terminal strip or
and wire(s) from the terminal strip or control
control relay(s) to the motor.
relay(s) to the motor.
b. If the motor has proper high voltage as identified
above
not Running
#1),high
and proper
B.
If (Motor
the motor
has proper
voltagelow
asvoltage
to a identified
programmed
terminal,
and not
is not
operating,
theand
above
(Motor
Running
#1),
motor
is failed,
will require
replacement. terminal,
proper
lowand
voltage
to a programmed
and is not operating, the motor is failed, and
will require replacement.
FIGURE11
18
FIGURE
Motor Connections
24VAC Common
24VAC "R" Signal through
thermostat output.
24VAC Common
24VAC "R" Signal through
thermostat output.
Manual
Page
2100-467H
23 of 23
Manual2100-666A
Page
33 of 37
ACCESSORIES
ADD-ON GVDM-26 PUMP MODULE KIT
INSTALLATION
NOTE: This section applies only if a GVDM-26 pump
module is added. Refer to GVDM-26 instructions for
complete installation details.
1. Follow all local, state and national codes applicable
to the installation of the pump module kit.
GENERAL
This high efficiency water source heat pump series was
designed with a refrigerant to water heat exchanger
commonly know as a desuperheater coil factoryinstalled for ease in installing optional GVDM-26 pump
module kit. The addition of this optional kit allows for
heat recovery for hot water heating when connected
to a home water heater. The amount of annual hot
water supplied and thus additional energy cost savings
will depend on the amount of hot water usage and the
number of hours the heat pump operates. This pump
kit is suitable for potable water.
2. Follow the installation instructions received with
the GVDM-26 pump module kit.
3. Connect the water lines between the unit, pump
module kit and the water heater.
4. Pump power is 115V-60Hz 1-phase. A 6' 3-prong
cord is supplied. Pump control is accomplished by
18 gauge 3-wire connection (field supplied) from
pump module to the GV heat pump 24V terminal
strip.
NOTE: The GVDM-26 pump module can be installed
on adjacent surface or nearer to hot water storage tank
if that better facilitates the plumbing or electrical
connection.
FIGURE 19
Typical Pump Kit Connection to Unit
FILTER ASSEMBLY
DESUPERHEATER
PUMP MODULE
ATTACH TO UNIT
USING PROVIDED
SCREWS
INLET AND OUTLET TUBES
SUPPLIED WITH PUMP MODULE
MIS-2647 B
Manual2100-666A
Page
34 of 37
Ground Source Heat Pump Performance Report Date: ____________________ Technician: __________________________________________ Company Reporting: ________________________ Contact Phone: ____________________________ Owner’s Name: ____________________________ Owner’s Address: ___________________________ 1. Model/Serial Numbers: (For 3‐Pc. Geo‐Trio system, include coil/compressor/blower information) 
Model Number(s): ______________________________________________________________ 
Serial Number(s): _______________________________________________________________ 2. Accessory Information: 
Thermostat Mfgr. _____________________ Model/Part Number: ___________________ 
Flow‐Center* Mfgr. _____________________ Model/Part Number: ___________________ *if applicable 3. Open‐Loop Water Source Information: 
Where/how is water discharged ___________________________________________________ 4. Closed‐Loop Water Source Information: Horizontal Trenches Horizontally Bored Vertical Pond/Lake Other (Describe) ________________________________________________________________ 
Type of Antifreeze________________ % of Antifreeze __________ Freezepoint °F _________ 
Piping Material ____________ Diameter of Loop Pipe ______ Diameter of Header Pipe _____ 
Length of Loops ________ Pressurized/Non‐Pressurized Flow Center _____________________ 
If Horz. Trench: Loops per trench ____ L x W x D of trenches ___________________________ Total Number of Trenches ________ Total Number of Loops _______ 
If Horz. Bored: Avg. Depth of Bores ________ Grout was used (Y/N) ___________ Total Number of Bores ___________ Total Number of Loops ___________ 
If Vert. Bored: Depth of Bores __________ Grout was used (Y/N) ____________ Total Number of Bores ___________ Total Number of Loops ____________ 
If Pond/Lake: Approx. Acreage of Pond/Lake _______________ Depth of Loops __________ Style of Loops: (coils, mats, Lake Plates) ____________ Total Number of Loops _____ General Notes: ________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Manual2100-666A
Page
35 of 37
The following information is needed to verify performance of the system. Note: Before testing, disable desuperheater, auxiliary electric heat, and any ventilation equipment that may allow outdoor air into the system. Measurements should be taken after a minimum 10 min. run time to ensure “steady‐state” of operation. Temperature and pressure measurements should be taken with a single thermometer and pressure gauge to eliminate discrepancies between multiple devices. Fluid Data: 1st Stg. Cool 2nd Stg. Cool 1st Stg. Heat 2nd Stg. Heat 5. Entering Fluid Temperature °F
__________ __________ __________ __________ 6. Leaving Fluid Temperature °F
__________ __________ __________ __________ 7. Entering Fluid Pressure psi
__________ __________ __________ __________ 8. Leaving Fluid Pressure psi
__________ __________ __________ __________ 9. Pressure Drop through coil (psi) __________ __________ __________ __________
Using the specific model number and pressure drop, refer to Water Coil Pressure Drop Chart on page 6 to find gallons‐per‐minute flow through water coil. 10. GPM through coil
__________ __________ __________ __________ Air Data: 11. Dry Bulb Return Air Temp °F
12. Wet Bulb Return Air Temp °F
13. Dry Bulb Supply Temperature °F 14. Wet Bulb Supply Air Temp °F
15. Return Static Pressure “WC
16. Supply Static Pressure “WC
1st Stg. Cool __________ __________ __________ __________ __________ __________ 2nd Stg. Cool __________ __________ __________ __________ __________ __________ 1st Stg. Heat __________ __________ __________ __________ __________ __________ 2nd Stg. Heat __________ __________ __________
__________ __________ __________ Refrigerant Data:
1st Stg. Cool 2nd Stg. Cool 1st Stg. Heat 2nd Stg. Heat 17. Head Pressure psi
__________ __________ __________ __________ 18. Suction Pressure psi
__________ __________ __________ __________ 19. Liquid Line Temperature °F
__________ __________ __________ __________ Note: Liquid line temperature should be measure directly before metering device. 20. Suction Line Temperature °F
__________ __________ __________ __________ Note: Suction line temperature should be measured approximately 6” from compressor. Calculate the subcooling from line #17 and Line #19 (Typically 10°F to 30°F) 21. Coil Subcooling °F
__________ __________ __________ __________ Calculate the superheat from line #18 and Line #20 (Typically 6°F to 12°F) 22. Coil Superheat °F
__________ __________ __________ __________ Electrical Data:_
1st Stg. Cool 2nd Stg. Cool 1st Stg. Heat 2nd Stg. Heat 23. Voltage at Load Side of Contactor __________ __________ __________ __________
Note: Voltage must be within 197VAC to 253VAC (for 208V/230V), 414VAC to 506VAC (for 460V)
24. Amperage Draw of Compressor __________ __________ __________ __________
25. Amperage Draw of Blower Motor __________ __________ __________ __________
Note: consult Electrical Table on page 5 to compare against typical run load amps.
Manual2100-666A
Page
36 of 37
36
36
4
44
43
3
35
2
Black/White
1 36
B
A
5
4
3
28
Brown
Purple
2
Yellow/Red
28
1
28
41
5 pin plug for Indoor Blower Motor
40
9
6
4
7
3
1
44 FLOW CENTER
RELAY
18
36
27
Yellow/Red
39
Capacitor
Orange
4 pin plug for Indoor Blower Motor
Red
Black
Black/White
T1
T2
Contactor 22
Black
19
Capacitor
35/370
40/370
30/370
40/440
40/440
CO
42
Red
Black
Black
Red
27
L1
L2
45
Red
Model
GV27S
GV38S
GV51S
GV61S
GV71S
9
Yellow
46
Yellow/Red
Orange
HP1
Ground
Lug 23
2
4
Circuit Breakers
Blue
CO2
Terminal Block
3
PUSH
Black
37
PUSH
3
38
Red
Blue
Blue
Brown
26 Black/White
Red/White
26
STATUS
Red
Red
Red
25
C
COM
LP1
LP2
L2
L1
Yellow
Black
Blue
Blue
R
208V
Transformer 7
240V
8
1
2
7
FLOW
SWITCH
Low Pressure
Switch (Anti-freeze)
36
Black
6
Yellow
Yellow
Blue
36
Red
5
230V water circulating pump(s)
connected for direct control
from compressor contactor
Blue
Low Pressure
Switch (Water)
High Pressure Switch
Red
WSD
TEST
O/V
HP2
208/230-60-1
C
Red
A
High Speed
Solenoid
S
Compressor
R
O
GEOTHERMAL
LOGIC CONTROL
C1
Black
4
Blue
CC
Blue
L
C2
Black/White
R
R1
Brown/White
Y1
2
4
28
12
5
6
Purple
25
25
Emergency
Heat Relay 11
1
Black/White
3
12
34
Yellow/Brown
Black/White
C
R2
Blue/Black
CCG
FS1
FS2
Manual2100-666A
Page
37 of 37
30
12
3
Purple
40
28
30
Blue/Black
Brown
Yellow
Red/Yellow
Pink
Brown/White
Black/White
Gray
Gray
28
28
Red/Yellow
31
Blue/Black
Orange
Yellow
12
14
12
15
12
L
E
W
O
Y2
Y1
G
25
R
A
C
C
Low Voltage
Term. Strip
Class 2
Black/White
Cond. cverflow
Sensor
27
29
Blue/White
Blue/White
Reversing Valve
26
29
WARNING
DANGER
*ELECTRICAL SHOCK HAZARD
*DISCONNECT POWER BEFORE
SERVICING.
!
USE COPPER CONDUCTORS
ONLY SUITABLE FOR AT LEAST
75° C.
!
Low Voltage
High Voltage
Field
Optional
Wire Identification numbers
for Bard use only.
Factory
99
7 COND. = Yellow fault light illuminated when fault indicated.
8 Status = Green Status LED will blink in normal operation.
6 F.S. = Red fault light illumninated when fault indicated.
5 L.P.S = Orange fault light illuminated when fault indicated.
4 H.P.S = Green fault light illuminated when fault indicated.
4105-106 B
3 For -10% airflow in stage #2 operation move this jumper off of 4-5
For antifreeze applications change low pressure switch to yellow leads on
1 compressor control module "LPC" terminals
2 For 208V operation move this wire to 208V transformer tap
Black/White
Red/White
Blower Control 17
28
31
3 pin plug for Heater Package
12 3
2 1
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