WATER SOURCE HEAT PUMPS
MODELS:
INSTALLATION
INSTRUCTIONS
GTB1-A
GTA3600UD1-A
GTA4860UD1-A
GTC36S1-ADCX
GTC48S1-ADCX
GTC60S1-ADCX
GTC36S1-ADNX
GTC48S1-ADNX
GTC60S1-ADNX
Blower Section
Coil Section
Coil Section
Compressor Section
Compressor Section
Compressor Section
Compressor Section
Compressor Section
Compressor Section
PATENT
PENDING
MIS-2830
Earth Loop Fluid
Temperatures 25° - 110°
Ground Water Temperatures 45° - 75°
BMC, Inc.
Bryan, Ohio 43506
Manual:
Supersedes:
File:
Date:
2100-537B
2100-537A
Volume I, Tab 8
07-20-10
Manual
Page
2100-537B
1 of 49
CONTENTS
Getting Other Informations and Publications ........ 3
General Information Geo-Trio (GT Series)
Water Source Nomenclature ................................... 4
"A" Coil, Blower & Compressor Sections ................. 4
Blower Conversion & Line Power Connect ............ 14
Application and Location
General ..............................................................
Shipping Damage ..................................................
Application .............................................................
Location ..............................................................
Ductwork ..............................................................
Filters
..............................................................
Condensate Drain ..................................................
Piping Access to Unit .............................................
17
17
17
17
17
18
18
18
Wiring Instructions
General .............................................................. 20
Control Circuit Wiring ............................................ 20
Wall Thermostats ................................................... 20
Ground Loop (Earth Coupled Water Loop Applications)
Note
.............................................................. 22
Circulation System Design .................................... 22
Start Up Procedure for Ground Loop System ........ 23
Ground Water (Well System Applications)
Note
.............................................................. 25
Water Connections ................................................ 25
Well Pump Sizing .......................................... 25 & 26
Start Up Procedure for Ground Water System ...... 27
Water Corrosion ............................................ 27 & 28
Remedies of Water Problems ................................ 28
Lake and/or Pond Installations ...................... 28 & 29
Desuperheater
Description ............................................................. 30
Location .............................................................. 30
Electrical Connection ............................................. 30
Figures
Figure 1A
Figure 1B
Figure 1C
Figure 1D
Figure 1E
Figure 2A
Figure 2B
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
GTA****UD1-A Dimensions ..................... 7
GTB1-A Dimensions ............................... 8
GTC**S1-D Dimensions .......................... 9
Assembled Upflow/Counterflow App. .... 10
Horizontal App. Dimensions ................... 11
Upflow & Counterflow Ducting Config. ... 12
Horiz. & Counterflow Ducting Config. .... 13
Blower Configuration ............................ 15
Blower Power Connections ................... 16
Optional Side Filter Rack ...................... 19
Thermostat Wiring ................................ 21
Circulation System Design .................... 22
Temperature & Pressure Measurement . 24
Perf. Model DORFC-1 Flow Ctr. ............ 24
Perf. Model DORFC-2 Flow Ctr. ............ 24
Water Connection Components ............ 26
Cleaning Water Coil .............................. 28
Lake or Pond Installation ...................... 29
Wiring Diagram ..................................... 32
Manual 2100-537B
Page
2 of 49
Installation Procedure - General ............................
Oper. of Heat Recovery Unit ..................................
Start Up & Checkout ..............................................
Maintenance ..........................................................
Control Board ........................................................
Sequence of Operation ..........................................
30
31
31
31
35
35
Sequence of Operation
Blower
..............................................................
Part Load Cooling ..................................................
Full Load Cooling ...................................................
Part Load Heating ..................................................
Full Load Heating ..................................................
Supplementary Electric Heat .................................
Geothermal Logic Controls ....................................
High Pressure Switch ............................................
Low Pressure Switch .............................................
Freeze Stat ............................................................
Condensate Overflow ............................................
Under/Over Voltage Protection ..............................
Intelligent Reset .....................................................
Alarm Output .........................................................
Pressure Service Ports ..........................................
System Start Up .....................................................
36
36
36
36
36
36
36
37
37
37
37
37
37
37
37
37
Service
Service Hints ......................................................... 42
Unbrazing System Components ............................ 42
Compressor Solenoid ............................................ 42
Troubleshooting GE ECM 2.3 Motors ............ 43 & 44
Troubleshooting Table ........................................... 45
Power Connector Table ......................................... 45
Ground Source Heat Pump
Performance Report .......................................... 46-47
Wiring Diagrams ................................................ 48-49
Figure 15A Desuperheater Single Tank System ......
Figure 15B Desuperheater Dual Tank System ........
Figure 16 Thermistor .............................................
Figure 17 Component Location .............................
Figure 18 Control Panel ........................................
Figure 19 Refrigerant Flow Diagrams ...................
Figure 20 Pressure Tables ....................................
Figure 21 Control Disassembly .............................
Figure 22 Winding Test .........................................
Figure 23 Drip Loop ..............................................
Figure 24 Control Connector Motor Half ...............
33
34
35
38
38
39
40
44
44
44
45
Tables
Table 1 Indoor Blower Performance .................... 4
Table 2 Flow Rates for Various Fluids ................. 5
Table 3 Specifications .......................................... 5
Table 4 Water Coil Pressure Drop ....................... 6
Table 5 Electrical Heat Specifications .................. 7
Table 6 Control Circuit Wiring ............................ 20
Table 7 Constant Flow Valves ........................... 25
Quick Reference Troubleshooting Chart ............... 41
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help you install the air
conditioner or heat pump. You can usually find these at
your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA
Air Conditioning Contractors of America
1712 New Hampshire Avenue
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI
American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
National Electrical Code ...................... ANSI/NFPA 70
Standard for the Installation .............. ANSI/NFPA 90A
of Air Conditioning and Ventilating Systems
Standard for Warm Air ...................... ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for 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
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
Ground Source Installation Standards ............. IGSHPA
Closed-Loop Geothermal Systems .................. IGSHPA
– Slinky Installation Guide
IGSHPA International Ground Source
Heat Pump Association
490 Cordell South
Stillwater, OK 74078-8018
Manual 2100-537B
Page
3 of 49
Geo-Trio™ GT Series Geothermal / Water Source Heat Pump Nomenclature
"A" Coil Section
GT
A
3600
Geo-Trio
UD
1
3600 (3 Ton)
4860 (4 & 5 Ton)
"A" = Coil Section
–
Option
Revision
Level
Series
A
Option
Blower Section
GT
B
1
Geo-Trio
–
A
Revision
Level
B = Blower
Section
A = 230 Volt 1-Phase
Option
Compressor Section
GT
C
36
Geo-Trio
S
1
–
A
S = Step Capacity
D
C
X
D = Desuperheater
X = Future
Use
Option
C = Compressor
Section
Nominal Capacity
Revision
Level
36 = 36K
48 = 48K
60 = 60K
A = 230 Volt 1-Phase
C = Copper Coil
N = Cupronickel Coil
TABLE 1
INDOOR BLOWER PERFORMANCE (RATED CFM) 1
MODEL
2
Rated
ESP
3
MAX
ESP
4
Continuous
Airflow
5
Mild Climate
Operation in
Part Load
Cooling
6
Part Load
Airflow
Full Load
Airflow
7
Electric Heat
Airflow
GTC36S1
0.15
0.60
600
700
850
1200
1300
GTC48S1
0.20
0.60
750
875
1075
1500
1600
GTC60S1
0.20
0.60
900
1050
1300
1800
1800
1
2
3
4
5
6
7
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.
Will occur automatically with control signal input.
NOTE: All values can be changed + 10% via the + adjustment dip switches on the tap select control inclusive in the
GTB1-A Blower Section (see instructions later in this manual, or on wiring diagram in blower section).
Manual 2100-537B
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TABLE 2
FLOW RATES FOR VARIOUS FLUIDS
MODELS
APPLICATION
GTC36S1
GTC48S1
GTC60S1
8
12
15
Ground Loop (15% Methanol, Propylene Glycol, etc.)
Ground Water
Water Loop (Cooling Tower)
6
7
9
9.2
12.1
14.3
TABLE 3
SPECIFICATIONS
MODEL
GTC36S1
GTC48S1
Electrical Rating (60HZ/1PH)
230/208-60-1
Operating Voltage Range
253-197 VAC
Minimum Circuit Ampacity
26.0
34.0
GTC60S1
38.0
+Field Wire Size
#8
#6
#4
Ground Wire Size
#10
#8
#6
++Delay Fuse or Circuit Breaker Max.
40
50
60
COMPRESSOR
Volts
230/208-60-1
Rated Load Amps (230/208)
Branch Circuit Selection Current
Locked Rotor Amps (230/208)
11.2 / 13.0
16.4 / 19.6
19.2 / 23.6
16.7
21.2
25.6
82 / 82
96 / 96
118 / 118
BLOWER MOTOR
Horsepower (ECM Motor)
3/4 Variable Speed
Volts
230/208-60-1
Motor Amps (Stage #2 @ Rated CFM)
3.4
4.3
4.4
FLOW CENTER (Based on DORFC-2)
Volts
230/208-60-1
Amps
2.14
2.14
2.14
DESUPERHEATER PUMP MOTOR
Volts
230/208-60-1
Amps
+75°C copper wire
0.15
0.15
0.15
++ HACR type circuit breaker
Manual 2100-537B
Page
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TABLE 4
WATER COIL PRESSURE DROP
Model
GPM
PSID
Ft. Hd.
3
0.1
0.23
4
0.5
5
GTC48S1
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
GTC60S1
PSID
Ft. Hd.
7.38
2
4.61
4.1
9.46
2.5
5.77
5.1
11.77
3.2
7.38
10
6.1
14.07
3.9
9.00
11
7.1
16.38
4.7
10.84
12
8.2
18.92
5.5
12.69
13
9.4
21.69
6.4
14.76
14
10.6
24.45
7.3
16.84
15
8.1
18.69
16
9
20.76
17
9.9
22.84
18
Manual 2100-537B
Page
6 of 49
GTC36S1
Manual 2100-537B
Page
7 of 49
3 5/16"
2 3/16"
17 5/8"
15 11/16"
2 3/16"
1 1/2"
30"
5 1/8"
3 1/2"
OVERFLOW
MAIN DRAIN
LIQUID CONNECTION
SUCTION CONNECTION
HORIZ. OVERFLOW K.O.
HORIZ. MAIN DRAIN K.O.
19 15/16"
22"
21 5/8"
13 5/8"
10 15/16"
7 1/4"
1 13/16"
CONDENSATE
OVERFLOW WIRES
2 3/4"
FIGURE 1A – GTA****UD1-A
A-COIL SECTION DIMENSIONS
27 15/16"
MIS-2818
FIGURE 1B – GTB1-A
BLOWER SECTION DIMENSIONS
16 3/8"
30"
13 1/4"
LOW VOLTAGE ENTRANCE
3 5/8"
22"
HIGH VOLTAGE K.O. FOR
REMOTE APPLICATIONS ONLY
1 1/4"
24 9/16"
18 13/16"
21"
15"
2 7/8"
3 5/16"
24"
MIS-2819
Manual 2100-537B
Page
8 of 49
1 1/2"
15 5/8"
OPTIONAL SIDE RETURN
OPENING ON BOTH SIDES
Manual 2100-537B
Page
9 of 49
2 1/2"
A
16 1/16"
12 1/4"
9 5/8"
1 7/8"
6 15/16"
1 3/4"
3"
B
WATER IN
LIQUID LINE
DESUPERHEATER
WATER OUT
DESUPERHEATER
WATER IN
SUCTION LINE
WATER OUT
22 1/16"
23 1/16"
30"
8"
4 13/16"
16 15/16"
1 15/16"
MODEL
GTC36S1
GTC48S1
GTC60S1
FIGURE 1C – GTC**S1-D
COMPRESSOR SECTION DIMENSIONS
DIM. B
4 1/8"
3 7/8"
3 3/4"
HIGH VOLTAGE OPTIONAL
FLOW CENTER WIRE ENTRANCE
HIGH VOLTAGE UNIT
POWER ENTRANCE
LOW VOLTAGE WIRE ENTRANCE
DIM. A
21"
20"
18 1/2"
MIS-2820
Manual 2100-537B
Page
10 of 49
15 5/8"
LEFT SIDE
24 9/16"
AIR
ENTRANCE
(UPFLOW ONLY)
27 7/8"
37 1/16"
51 1/4"
65 5/8"
55"
23 7/16"
"A"
46 1/16"
46 3/4"
REFRIGERANT
CONNECTIONS
FRONT
MODEL
GTC36S1
GTC48S1
GTC60S1
30 9/16"
33 1/4"
18 13/16"
28 15/16"
25 3/4"
37 7/8"
WATER IN
DESUPERHEATER
INLET
DESUPERHEATER
OUTLET
WATER OUT
OVERFLOW DRAIN OUTLET
RIGHT SIDE
24 9/16"
AIR
ENTRANCE
(UPFLOW ONLY)
LOW VOLTAGE
HIGH
VOLTAGE
LOW
VOLTAGE
LOW VOLTAGE
TOP
27 15/16"
TOP DUCT OUTLET FLANGE
MAIN DRAIN OUTLET
DIM. A
39 7/16"
40 15/16"
41 15/16"
SECURE SECTIONS TOGETHER
USING BOLT PART #1012-015
AND WASHER PART #1012-109
FIGURE 1D – ASSEMBLED UPFLOW / COUNTERFLOW APPLICATION DIMENSIONS
MIS-2821
15 5/8"
57 3/4"
19 15/16"
Manual 2100-537B
Page
11 of 49
7
27 8 "
Left Side View
Evaporator Opening
GTHZ1
Horizontal
Drain Pan
(Req'd)
7
19 8 "
Evaporator
Section
1
1
1
28"
32"
22 8 "
30"
1
12"
3
4"
1
31 4 "
Blower
Section
8"
43 8 "
3
Low Voltage
Entrance
1
3
1
28 8 "
21"
18 4 "
1
15"
Horiz. Support Bracket
32"
7
31 8 "
5
36 8 "
14"
Front View
1
38 2 "
Main Drain
Outlet
Overflow Drain
Outlet
Refrigerant
Connections
14"
3
High Voltage
Entrance
Low Voltage
Entrance
Top View
MIS-2824
Right Side View
1
17 8 "
Blower
Opening
24"
NOTE:
Requires
horizontal
drain pan kit
Model GTHZ-1
Evaporator and Blower in Horizontal Position
(Remote Compressor Section)
FIGURE 1E – HORIZONTAL APPLICATION DIMENSIONS
Manual 2100-537B
Page
12 of 49
Cond. Coil
Water In
Return
Desuper.
Water In
Desuper.
Water Out
3/8" Line Set
Cond. Coil
Water Out
7/8" Line Set
Main Drain
Secondary
Drain
Evap. Coil
Supply
Blower Air
Return
Blower in
Shipped Position
Return
Control Panel
Upflow
Position
Bottom return upflow and
top return counterflow filter
provision must be field
supplied
One FR23 (16 x 25 x 1) or
field supplied equivalent
required for upflow side
return installation
Air Filter Required
Cond. Coil
Water In
Desuper.
Water In
Desuper.
Water Out
3/8" Line Set
Cond. Coil
Water Out
7/8" Line Set
Main Drain
Secondary
Drain
Supply
Evap. Coil
Return
MIS-2828
Requires Switch #4 on Tap Select
Control to be Turned On.
NOTE:
Blower in
Alternate Position
Control Panel
Counterflow
Position
FIGURE 2A – UPFLOW & COUNTERFLOW DUCTING CONFIGURATIONS
Blower Air
Evap. Coil
<
>
Main Drain
Refrigerant
Secondary Drain Connections
Evap. Coil
Horizontal, Right Discharge
Blower in
Alternate Position
Blower Air
Supply
Blower in
Shipped Position
Return
Main Drain
Secondary
Drain
Return
Supply
Evap. Coil
Cond. Coil
Water In
Desuper.
Water In
Desuper.
Water Out
Cond. Coil
Water Out
Return
Blower Air
Return
Blower in
Shipped Position
Blower Air
NOTE: Requires horizontal
drain pan kit Model GTHZ-1
Refrigerant
Main Drain
Secondary Drain Connections
Supply
Horizontal, Left Discharge
Return
Return
Counterflow
Position
Refrigerant
Connections
MIS-2826
Model GTLID
Optional Top
Supply
Evap. Coil
Remote Condenser Section
Requires Switch #4
on Tap Select Control
to be Turned On.
NOTE:
Blower in
Alternate Position
Return
Main Drain
Secondary
Drain
Refrigerant
Connections
Upflow
Position
FIGURE 2B – HORIZONTAL & COUNTERFLOW DUCTING CONFIGURATIONS
Blower Air
Manual 2100-537B
Page
13 of 49
BLOWER CONVERSION FROM UPFLOW
TO COUNTERFLOW OR HORIZONTAL
RIGHT DISCHARGE
BLOWER LINE POWER CONNECTION
Following the directions on Figure 3 for counterflow and
horizontal right discharge, the indoor blower must be
removed and turned over in its mounting configuration.
The first is in “stacked” configurations, the blower can be
plugged into an electrical connection from the bottom of
the compressor (GTC**S1 Model Unit). This will work
for either upflow or counterflow applications. All
electrical sizing has been sized to accommodate this.
• Step 1
Remove both front service panels from the
GTB1-A.
• Step 2
Remove two screws securing blower at top
of GTB1-A (See Figure 3), and slide the
blower forward and out of the chassis.
• Step 3
Remove two screws from front fill plate on
bottom of GTB1-A, and slide both pieces of
metal forward and out of chassis.
• Step 4
Dip switch #4 on blower tap select control
must be turned “on”. (Refer to Wiring
Diagram 4117-100 on Page 48 of this
Manual.)
• Step 5
While turning on tap #4 above, adjust the
other taps accordingly for the tonnage of unit
being applied. (Again, refer to Wiring
Diagram 4117-100 on Page 48 of this
Manual.)
• Step 6
Turn blower over and slide into rails of
bottom rear of the GTB1-A front fill plate
that was removed in Step 3 above.
• Step 7
Remove bottom rear fill plate from bottom
front fill plate (discard rear), and resecure
front fill plate into unit base and front of
blower.
• Step 8
Replace GTB1-A front service doors after
making line and control voltage wiring
connections.
Manual 2100-537B
Page
14 of 49
Power connections for the GTB1-A can be made two
different ways.
The second is with “remote” blower (meaning separate
from the compressor section). Supplied in the GTB1-A is
an adaptor wire harness. On the right-hand side of the
GTB1-A chassis is a ½" electrical knockout. This harness
can be installed through this knockout with the supplied
strain relief into a standard electrical junction box (field
supplied). Electrical load sizing is included on the serial
plate of the GTB1-A for the required separate branch
circuit (See Figure 4).
Manual 2100-537B
Page
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MIS-2842 A
REMOVE BOTH
FRONT PANELS
1
5
4
REINSTALL
FRONT FILL PLATE
ROTATE BLOWER AND SLIDE
INTO BOTTOM OFFSETS
3
2
6
REINSTALL BOTH
FRONT PANELS
REMOVE (2) SCREWS FROM
FRONT FILL PLATE AND SLIDE
BACK FILL PLATE OUT OF CABINET
REMOVE (2) SCREWS
SECURING BLOWER
AND SLIDE BLOWER
OUT OF CABINET
FIGURE 3 – BLOWER CONFIGURATIONS
REINSTALL (2) SCREWS
SECURING BLOWER TO
FRONT FILL PLATE
DISCARD BACK
FILL PLATE
Manual 2100-537B
Page
16 of 49
PLUG BLOWER POWER
CONNECTOR INTO POWER
PLUG PROTRUDING THROUGH
CONDENSER BASE FOR BOTH
UPFLOW AND COUNTERFLOW
STACKED CONFIGURATIONS
FIGURE 4 – BLOWER POWER CONNECTIONS
MIS-2843
REMOVE SUPPLIED
WIRE HARNESS AND
STRAIN RELIEF BUSHING
FROM BLOWER POWER PLUG.
ROUTE WIRE HARNESS
THROUGH STRAIN RELIEF
AND INTO ELECTRICAL BOX
TO MAKE FIELD POWER
CONNECTION
MOUNT FIELD
SUPPLIED SINGLE
GANG ELECTRICAL
BOX ALIGNED OVER
HIGH VOLTAGE K.O.
APPLICATION AND LOCATION
GENERAL
LOCATION
The GT Series Geothermal Heat Pumps feature three
sections (GTA - Air Coil Section, GTB - Blower Section
and GTC - Compressor Section) which cover upflow
(bottom, right/left-side return), counterflow and horizontal
(left and right-hand discharge) applications.
The unit may be installed in a basement, closet, or utility
room provided adequate service access is ensured.
The individual sections are shipped internally wired,
requiring duct connections, thermostat wiring, 230/208 volt
AC power wiring, refrigerant line connections 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.
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 desuperheater 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
In applying a duct heater, refer to duct heater
installation instructions for minimum clearance to
combustible materials, maximum allowed inlet air
temperatures, and minimum air volume
requirements for KW usage.
Manual 2100-537B
Page
17 of 49
CAUTION
NEVER OPERATE MORE THAN 10KW STRIP HEAT WITH GEOTHERMAL HEAT PUMP
OPERATIONAL. USE ADDITIONAL KW STRIP HEAT BEYOND 10KW ONLY IN EMERGENCY
HEAT MODE.
TABLE 5
ELECTRICAL HEAT SPECIFICATIONS
F o r U se
With
All
GTC*S1
Models
240 Volts
Heater
P ackag e
Heater
P ackag e
8604-080
240/208-60-1
5.0
8604-081
240/208-60-1
9.8
8604-082
240/208-60-1
14.7
8604-083
240/208-60-1
19.2
KW
Amps
B TU H
Minimum
Circuit
Ampacity
Maximum
HACR
Circuit
Breaker
Field Wire
Siz e
+
208 Volts
B TU H
KW
Amps
20.8
17,065
3.75
18.0
12,799
26.0
30
#10
40.8
33,447
7.35
35.3
25,086
52.0
60
#6
61.2
50,171
11.0
52.9
37,543
76.6
80
#4
81.7
65,530
14.4
69.2
49,147
102.0
125
#1
+ Based upon 75°C copper wire. All wiring must conform to National Electric Code (Latest Edition) and all local codes.
FILTER
PIPING ACCESS TO UNIT
This unit must not be operated without a filter. 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 for correct airflow and static
pressure requirements (see Figure 5).
Water piping to and from the unit enters the unit cabinet on
the left 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.)
CONDENSATE DRAIN
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.
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.
NOTE: This drain line will contain cold water and must be
insulated to avoid droplets of water from compressor on
the pipe and dripping on finished floors or the ceiling
below the unit.
Manual 2100-537B
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18 of 49
Various fittings are available so you may then 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 7).
FIGURE 5
OPTIONAL SIDE FILTER RACK
24 9/16"
15 5/8"
FILTER FRAME
(2) SCREWS
MIS-2840
FILTER
FILTER DOOR
Manual 2100-537B
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WIRING INSTRUCTIONS
GENERAL
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 unit rating plate lists a “Maximum Time Delay Fuse”
or “HACR” type circuit breaker that is to be used with the
equipment. The correct size must be used for proper
circuit protection and also to assure that there will be no
nuisance tripping due to the momentary high starting
current of the compressor motor.
CONTROL CIRCUIT WIRING
The minimum control circuit wiring gauge needed to insure
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.
For low voltage connections, see Figure #6 on page 21.
There are multiple options based upon the type of
installation in regards to low voltage electrical connections
and what options are selected. These options include a
motorized valve or motorized valve with end switch for
ground water applications, and optional electric duct heater
connections.
NOTE: Review the “lettered triangles” and the
corresponding notes on the lower right-hand corner of
Figure #6. When options are not used, the wires will need
attached to the reference points accordingly.
Manual 2100-537B
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20 of 49
TABLE 6
CONTROL CIRCUIT WIRING
Rated VA of
Control Circuit
Transformer
50
Transformer
Secondary
F L A @ 24V
2.1
Maximum Total
Distance of
Control Circuit
Wiring in Feet
20 gauge
18 gauge
16 gauge
14 gauge
12 gauge
- 45
- 60
- 100
- 160
- 250
Example: 1. Control Circuit transformer rated at 50 VA
2. Maximum total distance of control circuit
wiring 85 feet.
From Table 6 minimum of 16 gauge wire
should be used in the control circuit wiring.
WALL THERMOSTAT SELECTION
The wall thermostat selection is important in that it needs
to be minimally 2-stage heat and 2-stage cool for
applications without electric heat.
For applications with electric heat, the thermostat will need
to minimally be 3-stage heat and 2-stage cool. The second
bank of electric heat (when equipped) should be wired
through a secondary relay for operation only in Emergency
Heat Mode, at which point compressor operation should be
disabled.
Manual 2100-537B
Page
21 of 49
NOTE: W1=FIRST STAGE AUX. HEAT
W2=SECOND STAGE AUX./EMERGENCY HEAT
Optional
Motorized Valve
With End Switch
(Use with Water/
Water Loop)
Y2
B
W1
W2
Y2
O
W1
W2
A
Optional Wiring
Field Installed Wiring
1
3
2
Y1
G
Y1
G
B
A
CO
CO
O
Y2
Y1
L
R
R
R
L
C
C
Black
Optional
Motorized Valve
Without End Switch
(Use With Water/
Water Loop)
Terminal Strip
in GTC*S1-D
C
A
Tap Select Control
in GTB1-A
Optional
Duct Heater
Green/Red
3 Stage Heat, 2 Stage Cool
Heat Pump Thermostat
A Coil Overflow
Sensor
4117-102 A
3.) Motorized valve with or without end
switch should be used when installing a
ground water/water loop.
2.) B wire not used when motorized
valve with end switch is present.
1.) A points connect when duct heater
not used.
Notes:
Green
Low Voltage Connection Diagram
White
FIGURE 6
THERMOSTAT WIRING
White/Black
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.
THE 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 of head loss in 1/2
inch or 3/4 inch 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.
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.
FIGURE 7
CIRCULATION SYSTEM DESIGN
PIPE FROM
GOUND LOOP
PIPE TO
GROUND LOOP
PUMP MODULE
STRAIGHT BARBED
BRASS ADAPTERS
OPTIONAL VISUAL
FLOW METER
NOTE: IF USED SUPPORT
WITH A FIELD FABRICATED
WALL BRACKET
HOSE CLAMPS
1" FLEXIBLE HOSE
WATER OUT
WATER IN
Manual 2100-537B
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MIS-2827
START UP PROCEDURE FOR GROUND
LOOP SYSTEM
1. Be sure main power to the unit is OFF at disconnect.
2. Set thermostat system switch to OFF, 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. Blowing
should stop.
5. Flush, fill and pressurize the closed loop system per
IGSHPA guidelines.
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.
NOTE: If a charge problem is determined (high or low):
A. Check for possible refrigerant leaks.
B. Recover all remaining refrigerant from unit and
repair leak.
C. Evacuate unit down to 29 inches of vacuum.
D. Recharge the unit with refrigerant by weight.
This is the only way to insure a proper charge.
Manual 2100-537B
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FIGURE 8
Thermometer
Dial face pressure guage
with guage adaptor
50
60
70
40
Retaining cap, hand tighten only
80
30
90
20
100
10
110
0
120
Pete's test plug
Test plug cap
Barbed 90° adapter
MIS-2622
FIGURE 9
PERFORMANCE MODEL DORFC-1 FLOW CENTER
35
30
Head (Feet)
25
20
15
10
5
0
0
5
10
15
20
25
30
35
Flow (GPM)
FIGURE 10
PERFORMANCE MODEL DORFC-2 FLOW CENTER
70
60
Head (Feet)
50
40
30
20
10
0
0
5
10
15
20
Flow (GPM)
Manual 2100-537B
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24 of 49
25
30
35
GROUND WATER
(WELL SYSTEM APPLICATIONS)
NOTE:
Unit shipped from factory with 60 PSIG low pressure
switch wired into control circuit for ground water
applications.
WATER CONNECTIONS
It is very important that an adequate supply of clean, noncorrosive 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, Figure 11. 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. Following is a table showing 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.
The figure 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, so as to minimize pressure drop.
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.
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.
TABLE 7
CONSTANT FLOW VALVES
Part No.
Min. Available
Pressure PSIG
Flow Rate
GPM
CFV-5
15 (1)
5
CFV-6
15 (1)
6
CFV-7
15 (1)
7
CFV-9
15 (1)
9
CFV-10
15 (1)
10
2. Adequate pressure at the fixture.
3. Able to meet the above from the depth of the
well-feet of lift.
(1) 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.
Manual 2100-537B
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25 of 49
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 in Manual 2100-078 should guarantee that the
well pump has enough capacity. It should also ensure 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 11
WATER CONNECTION COMPONENTS
NOTE:
Shown with Optional Top Kit for
Remote Condenser Applications
1
2
3
4
MIS-2825
5
6
7
8
See descriptions for these reference numbers on Page 25.
Manual 2100-537B
Page
26 of 49
SYSTEM START UP PROCEDURE FOR
GROUND WATER APPLICATIONS
1. Be sure main power to the unit is OFF at disconnect.
2. Set thermostat system switch to OFF, 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. 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: 6 GPM for a GTC36S1.)
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 the thermostat
switch to cool. Fan should be set for AUTO.
A. 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 and then refrigeration system
problem.
9. Switch the unit to the heat mode by moving the
thermostat switch to heat. Fan should be set for AUTO.
A. 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 inches of vacuum.
D. Recharge the unit with refrigerant by weight.
This is the only way to insure 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. These are:
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 your 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) or 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.
Manual 2100-537B
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27 of 49
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.
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 foot 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.
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 2 times the cubic feet
size of the dwelling that you are trying to heat (includes
basement if heated).
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.
B. The average water depth should be at least 4 feet and
there should be an area where the water depth is at least
12 to 15 feet deep.
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. Refer to the “Cleaning Water Coil”, Figure 12. The acid
solution can be introduced into the heat pump coil through the
hose bib A. 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.
FIGURE 12
CLEANING WATER COIL
HOSE BIB (A)
HOSE BIB (B)
PUMP
MIS-2836
Manual 2100-537B
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28 of 49
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 feet from the dwelling to be heated or
cooled.
G. Keep all water lines below low water level and below
the frost line.
H. Most installers use 4-inch 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
feet from the dry well location.
J. The drain line should be installed with a slope of 2
inches per 10 feet 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.
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, you can instead run
standard plastic piping out into the pond below the
frost and low water level.
WARNING
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 2100-078 available
from your distributor.
FIGURE 13
LAKE OR POND INSTALLATION
WELL CAP
ELECTRICAL LINE
PITLESS ADAPTER
TO PRESSURE
TANK
WATER
SUPPLY LINE
GRAVEL FILL
DROP
PIPE
15' to 20'
DEEP
WATER LEVEL
12'
to
15'
LAKE
or
POND
PERFORATED
PLASTIC CASING
SUBMERSIBLE
PUMP
Manual 2100-537B
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DESUPERHEATER
DESCRIPTION
The system is designed to heat domestic water using heat
recovered from a water source unit’s hot discharge gas.
LOCATION
Because of potential damage from freezing or
condensation, the unit must be located in a conditioned
space, therefore the unit must be installed indoors.
Locate the storage tank as close to the geothermal heat
pump and pump module as the installation permits. Keep
in mind that water lines should be a maximum of 25 feet
long measured one way. Also, the vertical lift should not
exceed 20 feet. This is to keep pressure and heat losses to
a minimum.
ELECTRICAL CONNECTION
The Desuperheater:
The desuperheater logic control with the remote thermal
sensors are built already hard-wired into the unit control
panel. 208/230-60-1 power for the desuperheater pump is
supplied with the same power as the compressor. The 24
volt signals needed are also tied in with the compressor call
signals.
WARNING
Never alter or plug factory installed pressure
relief valve on water heater or auxiliary tank.
INSTALLATION PROCEDURE –
GENERAL
Before beginning the installation, turn off all power
supplies to the water heater and unit, and shut off the main
water supply line.
TWO TANK – In order to realize the maximum energy
savings from the heat recovery system, it is recommended
that a second water storage tank be installed in addition to
the main hot water heater. Fossil fuel fired water heaters
must be a two-tank installation.
Tanks specifically intended for hot water storage are
available from water heater manufacturers (solar hot water
storage tanks). A well insulated electric water heater
without the electric heating elements will also make a
suitable storage tank.
The size of storage tank should be as large as space and
economy permit but in no event should it be less than onehalf of the daily water requirements for the occupants. As
a guide in estimating the daily family water requirements,
The Department of Energy recommends a figure of 16.07
gallons of hot water per day per individual. For example, a
family of four would require 64.3 gallons per day (4 x
16.07).
ONE TANK – The single hot water tank may be a new hot
water heater (sized to 100% of daily water requirements) or
the existing water heater in the case of a retrofit
installation. The existing water heater should be drained
and flushed to remove all loose sediment. This sediment
could damage the circulating pump. The bottom heating
element should be disconnected.
NOTE: Make sure water heater thermostats are set below
125° on One Tank Unit.
WATER PIPING – All water piping must adhere to all
state and local codes. Refer to piping diagrams for
recommended one and two tank installations. Piping
connections are 1/2 inch nominal copper plumbing.
A cleanable “Y” type strainer should also be included to
collect any sediment.
Manual 2100-537B
Page
30 of 49
DESUPERHEATER
OPERATION OF THE HEAT RECOVERY
UNIT
The pump module is a very simple device containing basic
controls and a circulating pump. Heat is transferred from
the hot refrigerant (discharge gas) to the cool water.
The operation of the Desuperheater Pump Module is
controlled first by the operation of the Geothermal Heat
Pump and secondly by internal controls within the Pump
Module. A low voltage signal from Thermostat “Y” is
connected to the desuperheater control board and acts as
the primary on/off switch for the circulating pump.
Also connected to this board is a temperature overlimit
device which shuts down the desuperheater once inlet
water has exceeded 125° so the water cannot create a scald
condition.
There are also two (2) thermistor sensors connected to the
control board. These thermistors are measuring and
controlling to ensure there is a positive heat differential
across the water being circulated. When operating in Part
Load Condition, there are certain conditions (Ground Loop
Temperatures versus Hot Water Temperatures) that
potential exists where heat could transfer from the hot
water into the refrigeration system instead of the
refrigeration system into the hot water. Through the
control board logic, these thermistors ensure there is at
least 2° positive differential between entering/leaving water
temperatures and will shut down the pump accordingly.
START UP AND CHECK OUT
Be sure all shut off valves are open and all power supplies
are on. Open a hot water faucet to permit any air to bleed
from the plumbing.
NOTE: The inherent design of this pump for maximum
efficiency means this pump is not self-priming. It is
imperative to check that the air has been adequately bled
from the system. There is a bleed-port built into the pump
module that can be utilized after the system water has been
fully restored. The bleed port is located directly above the
pump in the GTC compressor unit.
Turn ON the air conditioning system and verify the
circulating pump will operate. Feel the “Water to Unit”
and “Water from Water Heater” tubes for noticeable
difference in temperature. Turn OFF the system and verify
that the circulating pump stops.
NOTE: When checking the refrigerant operating pressures
of the ground source heat pump. The desuperheater must
be turned off. With the desuperheater operating a wide
variance in pressures can result, giving the service
technician the indication there is a charge problem when
the unit is operating correctly.
MAINTENANCE
CLEANING THE HEAT EXCHANGER – If scaling of
the coil is strongly suspected, the coil can be cleaned with a
solution of phosphoric acid (food grade acid). Follow the
manufacturer’s directions for the proper mixing and use of
cleaning agent.
Manual 2100-537B
Page
31 of 49
FIGURE 14
WIRING DIAGRAM
COMPRESSOR CONTACTOR SIGNAL
FROM GEOTHERMAL LOGIC CONTROL
3 AMP
FUSE
NC
1
2
OUTLET
N
PUMP OUTLET
C
NO
LINE VOLTAGE
DESUPERHEATER
PUMP PLUG
WATER SENSORS
CONTROL
LOGIC
INLET
TSTAT
POWER
L
BLACK
RED
C
24VAC
BLACK
C
R
RED
R
DESUPERHEATER
PUMP CONTROL
Y
GTC LOW VOLTAGE
TERMINAL STRIP
BLACK
BLACK
BLACK
BLACK
OVER TEMP. LIMIT
3
N
L
RED
RED
PUMP
MOTOR
RED
BLACK
MIS-2844
BI-METAL
TEMPERATURE
LIMIT
208/230-60-1
LINE POWER
Manual 2100-537B
Page
32 of 49
THERMISTOR
THERMISTOR
Manual 2100-537B
Page
33 of 49
EXISTING WATER HEATER
L.P., GAS, OIL, ELECTRIC
WATER HEATER FACTORY
INSTALLED HIGH PRESSURE
RELIEF VALVE
HOT WATER
TO HOUSE
HIGH PRESSURE
RELIEF VALVE
IN
WATER SOURCE UNIT
DRAIN
SHUTOFF
VALVES
STRAINER
OUT
OPTIONAL
CHECK VALVE
(PER CODES)
COLD WATER IN
OUT
IN
MIS-2831
DESUPERHEATER PUMP
SHIPPED DISCONNECTED
FROM FACTORY, CONNECT
3 PIN POWER PLUG TO
CONTROL PANEL
WHEN WATER STORAGE IS INSTALLED IN VERTICAL
POSITION, PIPING TO "IN" SIDE OF PUMP MUST BE
INSTALLED AT BOTTOM AS SHOWN.
ALL PLUMBING MUST CONFORM TO LOCAL CODES
NOTES: DO NOT OPERATE PUMP WITHOUT WATER LINES
CONNECTED AND WATER IN SYSTEM WITH SHUT OFF
VALVES OPEN.
FIGURE 15A – DESUPERHEATER SINGLE TANK SYSTEM
Manual 2100-537B
Page
34 of 49
OUT
ADDITIONAL HOT WATER
STORAGE TANK. NOT
ELECTRICALLY CONNECTED
DRAIN
EXISTING WATER HEATER
L.P., GAS, OIL, ELECTRIC
WATER HEATER
FACTORY INSTALLED
HIGH PRESSURE
RELIEF VALVES
HOT WATER
TO HOUSE
IN
IN
SHUTOFF VALVES
OPTIONAL
CHECK VALVE
(PER CODES)
OPTIONAL
BYPASS LOOP
COLD WATER IN
WATER SOURCE UNIT
DRAIN
SHUTOFF
VALVES
STRAINER
OUT
HIGH PRESSURE
RELIEF VALVE
OUT
IN
MIS-2832
DESUPERHEATER PUMP
SHIPPED DISCONNECTED
FROM FACTORY, CONNECT
3 PIN POWER PLUG TO
CONTROL PANEL
WHEN WATER STORAGE IS INSTALLED IN VERTICAL
POSITION, PIPING TO "IN" SIDE OF PUMP MUST BE
INSTALLED AT BOTTOM AS SHOWN.
ALL PLUMBING MUST CONFORM TO LOCAL CODES
NOTES: DO NOT OPERATE PUMP WITHOUT WATER LINES
CONNECTED AND WATER IN SYSTEM WITH SHUT OFF
VALVES OPEN.
FIGURE 15B – DESUPERHEATER DUAL TANK SYSTEM
DESUPERHEATER CONTROL BOARD
SEQUENCE OF OPERATION
The desuperheating control board will make a
determination whether or not to energize the pump
relay inclusive on the control board.
A. It will constantly monitor inputs from two
temperature sensors, Inlet & Outlet water sensors.
B. It will constantly monitor the Y signal.
C. Upon acknowledgment of Y signal, and following
two minutes, the control board will energize the
pump relay.
D. After 1½ minutes, based on temperature difference
between Outlet & Inlet sensors, and the presence of
Y signal, the following will take place:
1.) If temperature difference is greater than 3°F,
then the control will continue to energize pump
relay.
2.) If temperature difference is less than 3°F, then
the control will de-energize the pump relay.
3.) The control will next wait for 10 minutes
before repeating Step #1 (above).
E. The Over Temperature Limit Switch is placed in
series with the line voltage. Therefore, continuity
between L of line voltage and L of pump output is
forced broken when the Over Temperature Limit
Switch opens (see Wiring Diagram).
F. The 3-amp fuse is put in series with the R
connection to the board. Whenever the fuse is
blown, the control will lose power and
consequently, the relay will disengage.
Figure 16
THERMISTOR
TEMPERATURE F VS RESISTANCE R OF TEMPERATURE SENSOR
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
Manual 2100-537B
Page
35 of 49
SEQUENCE OF OPERATION
BLOWER
PART LOAD HEATING (No Electric Heat)
Blower functions are all controlled through 24 VAC input
signals from the control thermostat and 208/230 VAC
being supplied to the motor continuously.
When thermostat system is placed in HEAT, the reversing
valve solenoid is no longer energized. On a call for part
load heating, the thermostat completes a call from “R” to
“Y1” sending the signal to both the Tap Select Control
located in the blower compartment, and to the Geothermal
Logic Control located in the compressor section. The tap
select control uses the input signal versus the motor
program, and the dip switch settings to determine the
proper air volume rate to operate. The Geothermal Logic
Control verifies that the High Pressure Switch, the Low
Pressure Switch, and the Freeze Stat controls are all in the
“closed” position. It then energizes the “A” terminal
output to start the flow center (Ground Loop Applications)
or energizes the water solenoid (Ground Water/Water Loop
Applications.) Following 10 seconds of the “A” terminal
energization, the compressor contactor is energized.
The installer must be sure to configure the tap select control
board (located in blower compartment) based upon the
specific model application. By default, the tap select control
(located in the blower compartment), is shipped from the
factory to operate at the airflow ranges for the GTC60S1
model. Please see Wiring Diagram (Page 48) which details
the required dip switch changes required between models.
NOTE 1: On a call from only “G” from the thermostat (call
for manual fan), the blower will operate at a significantly
reduced airflow rate to allow for air circulation and filtration,
but at reduced power consumption and sound levels.
NOTE 2: There are ±10% adjustments that are enabled on
the tap select control that will allow you to increase or
decrease the air volume plus or minus 10%. Increasing the
air volume may help with some slightly increased capacity
and increased duct velocity if there is an air distribution
issue. Decreasing the air volume with help improve latent
capacity in a humid application, and will help to lower air
distribution sound levels. Please see Wiring Diagram
(Page 48) which details the required dip switch changes for
this adjustment.
FULL LOAD HEATING
The system should already be in Part Load Heating
operation prior to Full Load Heating being energized.
Additionally what happens, 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 sends a
signal to the Blower Tap Select Control in the blower
compartment to drive the blower to the proper CFM.
PART LOAD COOLING
SUPPLEMENTARY ELECTRIC HEAT
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” sending
the signal to both the Tap Select Control located in the
blower section and to the Geothermal Logic Control
located in the compressor section. The tap select control
uses the input signal versus the motor program, and the dip
switch settings to determine the proper air volume rate to
operate. The Geothermal Logic Control verifies that the
High Pressure Switch, the Low Pressure Switch, and the
Freeze Stat controls are all in the “closed” position. It then
energizes the “A” terminal ouput to start the flow center
(Ground Loop Applications) or energizes the water
solenoid (Ground Water/Water Loop Applications).
Following 10 seconds of the “A” terminal energization, the
compressor contactor is energized.
The system should already be in FULL LOAD HEATING
operation (above). The thermostat completes a circuit from
“R” to “W2”, which energizes the first bank of electric heat.
FULL LOAD COOLING
Anti-Short Cycle Timer – After compressor shutdown, or
power disruption, a 5-minute timer is applied and prevents
the compressor from operating.
The system should already be in Part Load Cooling
operation prior to Full Load Cooling being energized.
Additionally what happens, 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 sends a
signal to the Blower Tap Select Control in the blower
compartment to drive the blower to the proper CFM.
Manual 2100-537B
Page
36 of 49
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 5minute delay + a random start delay of 0 to 60-second is
applied. After the random delay, the compressor relay is
energized (Terminals CC & 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.
SEQUENCE OF OPERATION
HIGH PRESSURE SWITCH
(TERMINALS HP1 & 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 & 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.
FREEZE STAT (Optional Field Add-On
Option)
(TERMINALS FS & FS2) Circuit will be proved as
“closed” prior to energizing “A” or “CC” terminals. If
freezestat 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.
UNDER & 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 & over
voltage protection starts at plus or minus 20% from
nominal voltage and returns to operation at plus or minus
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
NOTE: Jumper wire is factory installed.
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.
CONDENSATE OVERFLOW
SYSTEM START-UP
(Terminals CO & CO2) This input operates when the
water level in the condensation 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.
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.
Manual 2100-537B
Page
37 of 49
FIGURE 17 — COMPONENT LOCATION
WATER COIL
LOW PRESSURE
SWITCHES
REVERSING
VALVE
HIGH PRESSURE
SWITCH
EXPANSION
VALVE
DESUPERHEATER
COIL
LOW VOLTAGE
FILTER/DRIER
COMPRESSOR
PUMP
UNIT HIGH VOLTAGE
PUMP MODULE
HIGH VOLTAGE
MIS-2838
FIGURE 18 — CONTROL PANEL
TERMINAL
STRIP
GEOTHERMAL
LOGIC CONTROL
DESUPERHEATER
CONTROL BOARD
COMPRESSOR
CONTACTOR
GROUND TERMINALS
PUMP MODULE
POWER CONNECTION
CIRCUIT BREAKERS
RELAY
PLUG
COMPRESSOR
CAPACITOR
MIS-2837
Manual 2100-537B
Page
38 of 49
FIGURE 19
Manual 2100-537B
Page
39 of 49
FIGURE 20
PRESSURE TABLES
Mo del
GTC 36S1
GTC 48S1
GTC 60S1
R eturn Air
Temperature P ressure 30°F
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
108
148
116
152
124
157
109
148
117
151
126
157
116
139
124
143
134
148
FU LL LOAD C OOLIN G — Fluid Temperature Entering Water C o il °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
111
163
118
167
127
173
111
162
119
166
128
172
117
154
125
158
134
163
113
177
121
182
130
188
113
176
121
181
130
187
117
169
125
173
134
179
116
192
124
196
133
203
115
191
123
196
132
203
117
183
125
188
135
195
118
206
126
211
136
219
117
205
125
211
134
218
117
198
126
203
135
210
121
221
129
226
139
234
119
220
127
226
137
233
118
213
126
219
135
226
123
235
132
241
142
250
121
234
129
240
139
249
118
228
126
234
135
242
126
250
134
256
144
265
122
249
131
255
141
264
118
243
127
249
136
258
128
264
137
271
147
280
124
263
133
270
143
279
119
257
127
264
137
273
129
286
138
294
148
304
125
285
134
292
144
302
120
278
129
285
138
295
129
309
138
317
149
328
127
306
135
314
145
325
122
298
130
305
140
316
130
331
139
340
149
351
128
328
137
336
147
348
123
318
132
326
142
337
131
353
140
362
150
375
129
349
138
358
148
371
125
338
134
347
144
359
10°F
15°F
20°F
25°F
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
52
252
44
258
46
273
59
262
52
270
54
282
66
272
60
281
62
292
72
282
68
293
70
301
79
292
76
304
78
310
86
302
84
316
86
319
93
312
92
327
94
329
99
322
100
339
102
338
106
332
108
350
110
347
117
342
119
361
118
357
129
353
129
372
126
366
140
363
140
383
134
376
95°F 100°F 105°F 110°F
131
376
140
385
151
399
130
371
139
380
149
393
127
358
135
367
145
380
132
398
141
408
152
422
131
392
140
402
151
416
128
378
137
388
147
402
132
420
142
431
152
446
132
413
141
424
152
439
130
398
139
409
149
423
133
442
142
454
153
470
133
435
142
446
153
462
131
419
140
429
151
444
70°F
75°F
80°F
85°F
151
373
150
394
142
385
162
383
161
405
150
395
174
394
171
416
158
404
185
404
182
427
166
414
FU LL LOAD H EATIN G — Fluid Temperature Entering Water C o il °F
Mo del
R eturn Air
Temperature P ressure 5°F
GTC 36S1
70° D B
GTC 48S1
70° D B
GTC 60S1
70° D B
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
45
242
36
247
38
264
PAR T LOAD C OOLIN G — Fluid Temperature Entering Water C o il °F
Mo del
GTC 36S1
GTC 48S1
GTC 60S1
R eturn Air
Temperature P ressure 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
116
130
124
133
134
138
119
131
128
135
137
139
127
122
135
125
145
130
119
144
127
148
136
153
121
146
130
149
140
155
127
137
136
141
146
146
121
159
129
163
139
168
123
160
132
164
142
170
127
152
136
156
146
161
123
173
132
177
142
184
125
174
134
179
144
185
127
167
136
171
147
177
126
188
134
192
144
199
127
189
136
193
147
200
128
182
137
187
147
193
128
202
137
207
147
214
129
203
139
208
149
215
128
197
137
202
147
209
130
216
139
222
150
230
132
217
141
223
151
230
128
212
137
217
148
225
133
231
142
237
153
245
134
231
143
237
154
246
129
227
138
233
148
241
135
245
144
252
155
261
136
246
145
252
156
261
129
242
138
248
148
257
135
265
144
271
155
281
137
266
146
273
157
283
130
262
139
269
149
278
135
284
145
291
155
301
137
287
147
294
158
305
131
282
140
289
150
299
135
303
145
310
156
321
138
308
148
316
159
327
131
302
141
310
151
320
135
322
145
330
156
341
139
328
149
337
160
348
132
322
141
330
152
342
R eturn Air
Temperature P ressure 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
35
247
31
238
38
247
46
256
43
247
48
257
57
264
54
257
58
268
68
273
66
266
68
278
80
288
77
281
79
294
91
296
89
291
89
305
102
305
100
300
99
315
111
317
109
311
109
326
120
328
117
322
119
336
131
337
129
332
129
347
143
346
140
341
140
357
154
354
152
351
150
368
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
75° D B
62° WB
80° D B
67° WB
85° D B
72° WB
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
95°F 100°F 105°F 110°F
135
341
145
349
156
362
140
349
150
358
161
370
133
342
142
351
153
363
136
360
145
369
156
382
141
370
151
379
162
392
134
362
143
371
154
384
136
379
145
389
156
402
142
390
152
400
163
414
134
382
144
392
155
405
136
398
145
408
156
422
143
411
153
421
164
436
135
402
145
412
156
426
70°F
75°F
80°F
85°F
165
363
163
360
160
378
176
372
175
370
170
389
188
381
186
379
181
399
199
389
198
389
191
410
PAR T LOAD H EATIN G — Fluid Temperature Entering Water C o il °F
Mo del
GTC 36S1
70° D B
GTC 48S1
70° D B
GTC 60S1
70° D B
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
Low S i de
Hi gh Si de
23
238
20
228
27
236
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.
Manual 2100-537B
Page
40 of 49
Manual 2100-537B
Page
41 of 49
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 Overcharge
Refrigerant Charge Low
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)
Scaled or Plugged Coil (CLg)
Water Volume Low (Htg)
Water Volume Low (Clg)
Fins Dirty or Plugged
Plugged or Restricted Metering Device (Clg)
Motor Winding Defective
Air Volume Low
AUX.
INDOOR SECTION
Indoor Blower Motor
Heat Gen.
and Coil
Air Filters Dirty
Water Coil
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
Control Circuit
Seized
Suction Pressure Too High
Defective Contacts in Contactor
POWER SUPPLY
Undersized or Restricted Ductwork
Line Voltage
Low Water Temperature (Htg)
QUICK REFERENCE TROUBLESHOOTING CHART FOR WATER TO 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
Heating Cycle
Auxillary Heat Upstream of Coil
SERVICE
SERVICE HINTS
COMPRESSOR SOLENOID
1. Caution owner to maintain clean air filters at all times.
Also, not to 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 36 & 37 for function.)
A nominal 24-volt direct current coil activates the internal
compressor solenoid. The input control circuit voltage must
be 18 to 28 volts 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.
ECM MOTOR
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.
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
Do not plug in or unplug blower motor
connectors while the power is on. Failure
to do so may result in motor failure.
Manual 2100-537B
Page
42 of 49
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 percent.
2. If step one does not give the expected results, shut unit
off. Apply 18 to 28 volts 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.
Voltage check: Apply control voltage to the plug wires (18
to 28 volts 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 zero 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 zero ohms.
Replace plug if either of these test methods does not show
the desired results.
TROUBLESHOOTING GE ECM 2.3™ MOTORS
CAUTION:
Symptom
Cause/Procedure
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.
• 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
Symptom
Cause/Procedure
Motor rocks slightly
when starting
• This is normal start-up for ECM
• “Hunts” or “puffs” at
high CFM (speed)
• Does removing panel or filter reduce
“puffing”?
- Reduce restriction
- Reduce max. airflow
Motor won’t start
• No movement
• Check blower turns by hand
• 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
Motor oscillates up
load & down while being
tested off of blower
Motor starts, but
runs erratically
• Varies up and down
or intermittent
• Check for loose or compliant motor mount
• Make sure blower wheel is tight on shaft
• Perform motor/control replacement check
• It is normal for motor to oscillate with no
on shaft
• Check line voltage for variation or “sag”
• 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
• 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
• Air noise
Evidence of Moisture
• Motor failure or
Check
malfunction has occurred
and moisture is present
• Replace motor and Perform Moisture
• Evidence of moisture
present inside air mover
• Perform Moisture Check
Do
Don’t
• Check out motor, controls,
wiring and connections
thoroughly before replacing
motor
• Orient connectors down so
water can’t get in
- Install “drip loops”
• Use authorized motor and
model #’s for replacement
• Keep static pressure to a
½"
minimum:
- Recommend high
efficiency, low static filters
- Recommend keeping filters
clean.
- Design ductwork for min.
static, max. comfort
- Look for and recommend
ductwork improvement,
where necessary
• Automatically assume the motor is bad.
• Locate connectors above 7 and 4 o’clock
positions
• Replace one motor or control model # with
another (unless an authorized replacement)
• Use high pressure drop filters some have
H20 drop!
• Use restricted returns
• 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?
Manual 2100-537B
Page
43 of 49
TROUBLESHOOTING GE ECM™ MOTORS CONT’D.
Replacing ECM Control Module
To replace the control module for the GE variable-speed indoor blower
motor you need to take the following steps:
1. You MUST have the correct replacement module. The controls are
factory programmed for specific operating modes. Even though they look
alike, different modules may have completely different functionality.
USING THE WRONG CONTROL MODULE VOIDS ALL PRODUCT
WARRANTIES AND MAY PRODUCE UNEXPECTED RESULTS.
2. Begin by removing AC power from the unit being serviced. DO NOT
WORK ON THE MOTOR WITH AC POWER APPLIED. To avoid
electric shock from the motor’s capacitors, disconnect power and wait at
least 5 minutes before opening motor.
3. It is not necessary to remove the motor from the blower assembly, nor
the blower assembly from the unit. Unplug the two cable connectors to the
motor control assembly. There are latches on each connector. DO NOT
PULL ON THE WIRES. The plugs remove easily when properly
released.
4. Locate the screws that retain to the motor control bracket to the
sheet metal of the unit and remove them. Remove two (2) nuts that
retain the control to the bracket and then remove two (2) nuts that
retain sheet metal motor control end plate. Refer to Figure 21.
5. Disconnect the three (3) wires interior of the motor control by
using your thumb and forefinger squeezing the latch tab and the
opposite side of the connector plug, gently pulling the connector. DO
NOT PULL ON THE WIRES, GRIP THE PLUG ONLY. Refer to
Figure 21.
6. The control module is now completely detached from the motor.
Verify with a standard ohmmeter that the resistance from each motor
lead (in the motor plug just removed) to the motor shell is >100K
ohms. Refer to Figure 22. (Measure to unpainted motor end plate.) If
any motor lead fails this test, do not proceed to install the control
module. THE MOTOR IS DEFECTIVE AND MUST BE
REPLACED. Installing the new control module will cause it to fail
also.
7. Verify that the replacement control is correct for your
application. Refer to the manufacturer's authorized replacement list.
USING THE WRONG CONTROL WILL RESULT IN
IMPROPER OR NO BLOWER OPERATION. Orient the control
module so that the 3-wire motor plug can be inserted into the socket in
the control. Carefully insert the plug and press it into the socket until
it latches. A SLIGHT CLICK WILL BE HEARD WHEN
PROPERLY INSERTED.
8. Reverse the steps #5, 4, 3 to reconnect the motor control to the
motor wires, securing the motor control cover plate, mounting the
control to the bracket, and mounting the motor control bracket back
into the unit. MAKE SURE THE ORIENTATION YOU SELECT
FOR REPLACING THE CONTROL ASSURES THE
CONTROL'S CABLE CONNECTORS WILL BE LOCATED
DOWNWARD IN THE APPLICATION SO THAT WATER
CANNOT RUN DOWN THE CABLES AND INTO THE
CONTROL. DO NOT OVERTIGHTEN THE BOLTS.
9. Plug the 16-pin control plug into the motor. The plug is keyed.
Make sure the connector is properly seated and latched.
10. Plug the 5-pin power connector into the motor. Even though
the plug is keyed, OBSERVE THE PROPER ORIENTATION. DO
NOT FORCE THE CONNECTOR. It plugs in very easily when
properly oriented. REVERSING THIS PLUG WILL CAUSE
IMMEDIATE FAILURE OF THE CONTROL MODULE.
11. Final installation check. Make sure the motor is installed as follows:
a. Motor connectors should be oriented between the 4 o’clock
and 8 o’clock positions when the control is positioned in its
final location and orientation.
b.Add a drip loop to the cables so that water cannot enter the
motor by draining down the cables. Refer to Figure 23.
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 22
Figure
4
Winding Test
Figure 21
Figure
3
Control Disassembly
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 235
Figure
Drip Loop
ECM
2.3/2.5
Motor Connector
(3-pin)
Connector Orientation
Between 4 and 8 o'clock
Control Connector
(16-pin)
Power Connector
(5-pin)
Hex-head Screws
Manual 2100-537B
Page
44 of 49
Back of
Control
Drip Loop
TROUBLESHOOTING GE ECM™ MOTORS CONT’D.
MODE of OPERATION
Thermostat 24 VAC
Inuput Signals
Pin #1
OFF
Continuous
Blow er
Part Load
Cooling
Full Load Cooling
Part Load
Heating
—
"G"
"G", "Y1", "O"
"G", "Y1", "Y2", "O"
"G", "Y1"
Full Load
Heating
Full Load Heating +
Electric Heat Stage #1
Emergency Heat
Mode
"G", "Y1", "Y2" "G", "Y1", "Y2", "W1" "G", "E", "W1", "W2"
24 VAC "C" (Common) Signal, Always Energized
Pin #2
X
Pin #3
24 VAC "C" (Common) Signal, Always Energized
Pin #4
Delay Tap Profiles, Varied Half-Wave Signals Based Upon Settings
Pin #5
Cool Tap Select Tables, Varied Half-Wave Signals Based Upon Settings (Tonnage)
Pin #6
X
X
X
X
Pin #7
Adjustment Tap Profiles, Varied Half-Wave Signals Based Upon Settings
Pin #8
DC Volts "-" Output in Direct Correlation to CFM
Pin #9
X
X
X
X
Pin #10
Future Use; Not Currently Programmed for Function
Pin #11
Heat Tap Select Tables, Varied Half-Wave Signals Based Upon Tonnage
Pin #12
24 VAC Hot "R" Signal, Always Energized
Pin #13
X
Pin #14
X
Pin #15
Pin #16
X
X
X
X
X
X
X
X
DC Volts "+" Output in Direct Correlation to CFM
FIGURE 24
CONTROL CONNECTOR MOTOR HALF
9
1
10 11 12 13 14 15 16
2
3
4
5
6
7
POWER CONNECTOR *
8
PWB HEADER
PIN
1
MIS-2839
POWER CONNECTOR
MOTOR HALF
1
2
3
4
AMP 1-350945-0
Description
2
Jumper Pin 1 to Pin 2 for
120VAC Line Input Only **
3
Chassis Ground
4
AC Line
5
AC Line
*
Suggested mating connector
Housing — AMP 350809-1
Contact — AMP 350537-1
**
WARNING — Applying 240VAC line input with
PIN 1 to PIN 2 jumper in place will permanently
damage unit!
5
Manual 2100-537B
Page
45 of 49
GROUND SOURCE HEAT PUMP
PERFORMANCE REPORT
This performance check report should be filled out by installer and retained with unit.
DATE
1.
TAKEN BY:
UNIT:
Mfgr
Model No.
S/N
THERMOSTAT:
Mfgr
Model No.
P/N
2.
Person Reporting
3.
Company Reporting
4.
5.
Installed By
User’s (Owner’s) Name
Address
6.
Unit Location
Date Installed
WATER SYSTEM INFORMATION
7.
Open Loop System (Water Well)
A.
8.
Closed Loop System
If Open Loop where is water discharged?
The following questions are for Closed Loop systems only
A.
Closed loop system designed by
B.
Type of antifreeze used
C.
System type:
D.
Pipe material
E.
Pipe Installed:
1. Horizontal
No. pipes in trench
2. Vertical
Manual 2100-537B
Page
46 of 49
% Solution
Series
Parallel
Nominal Size
Total length of pipe
ft
Depth bottom pipe
ft
Total length of bore hole
ft
THE FOLLOWING INFORMATION IS NEEDED
TO CHECK PERFORMANCE OF UNIT.
Cooling
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
FLUID SIDE DATA
Entering fluid temperature
Leaving fluid temperature
Entering fluid pressure
Leaving fluid pressure
Pressure drop through coil
Gallons per minute through the water coil
Liquid or discharge line pressure
Suction line pressure
Voltage at compressor (unit running)
Amperage draw at line side of contactor
Amperage at compressor common terminal
* Suction line temperature 6” from compressor
* Superheat at compressor
* Liquid line temperature at metering device
* Coil subcooling
INDOOR SIDE DATA
Dry bulb temperature at air entering indoor coil
Wet bulb temperature of air entering indoor coil
Dry bulb temperature of air leaving indoor coil
Wet bulb temperature of air leaving indoor coil
* Supply air static pressure (packaged unit)
* Return air static pressure (packaged unit)
Other information about installation
Cooling
24.
25.
26.
27.
28.
29.
30.
** Heating
F
F
PSIG
PSIG
PSIG
GPM
PSIG
PSIG
V
A
A
F
F
F
F
** Heating
F
F
F
F
WC
WC
** When performing a heating test insure that 2nd stage heat is not activated
* Items that are optional
Manual 2100-537B
Page
47 of 49
208/230-60-1
3
4
GREEN
BLACK
2
RED
1
4-PIN UNIT
7 POWER PLUG
7 5-PIN MOTOR
POWER PLUG
1
Indoor
Blower
Motor
2
3
RED
BLACK
1
4
5
MODEL
1
2
OFF
OFF
ON
OFF
OFF
ON
5
6
OFF
OFF
ON
OFF
OFF
ON
7
7
240V
7
208V
COM
ADJUSTMENT TAPS
NONE "+10%" "-10%" NONE
3
4
OFF
OFF
ON
OFF
OFF
ON
ON
ON
NOTE: SWITCH #4 MUST BE TURNED
ON WHEN BLOWER IS CONVERTED TO
COUNTERFLOW OR HORIZONTAL
RIGHT DISCHARGE
16-PIN BLOWER
CONTROL PLUG
7
3
9
C
8
12 CIRCUIT
BREAKER
3A
R
RED/WHITE
BLACK/WHITE
10
RED/WHITE
GTC60S1 GTC48S1 GTC36S1
TRANSFORMER
DIP
SWITCH #
9
8
BLACK/WHITE
BROWN
BLACK/WHITE
GRAY
BLUE/BLACK
YELLOW
BLACK
YELLOW/BLACK
11
16-PIN BLOWER
CONTROL PLUG
ON
OFF
11 10
9
ECM 2
CONTROL
BLUE
14 13 12
1
PURPLE/WHITE
15
2
3
RED
4
RED/WHITE
5
RED/YELLOW
16
PURPLE
6
ORANGE
7
YELLOW/RED
8
FIELD CONNECTIONS TO THERMOSTAT
AND CONDENSING SECTION
1
Manual 2100-537B
Page
48 of 49
FOR 208V OPERATION,
MOVE THIS RED WIRE
TO 208V TRANSFORMER
TAP
4117-100 B
24
25
C
High Speed
Solenoid
S
N
RED
40
40
L
31
34
RED
35
21
BLUE
36
26
21
CC
A
O
L
Y
R
C
35
35
13
R1
C2
3
2
1
GRAY
GRAY
BLACK
37
RED
RED
BLUE
BLUE
BLUE
BLUE
HIGH PRESSURE
SWITCH
RED
RED
208/230-60-1
LINE POWER
FIELD
CONNECTED
STATUS
CO2
CO
FS2
FS
LP2
LP1
HP2
HP1
27
1
4 F.S. = Red fault light illumninated when fault indicated.
6 Status = Green Status LED will blink in normal operation.
At lock out status LED is ON.
LOW PRESSURE
SWITCH (ANTI-FREEZE)
YELLOW
YELLOW
4-PIN BLOWER
POWER PLUG LOW PRESSURE
38
SWITCH (WATER)
4
29
6
5
4
3
2
C1
22
GRAY
3 L.P.S = Orange fault light illuminated when fault indicated.
12
CAPACITOR
40
39
SCREW TO TAB 14
38
38
COMPRESSOR
CONTACTOR 11
GROUND
19 LUG
BLACK/
WHITE
R2
GEOTHERMAL
LOGIC CONTROL
8
WSD
TEST
O/V
GRAY
27
BLACK/WHITE
RED/WHITE
LOW VOLTAGE 3
TERMINAL STRIP
20
BLACK
CCG
RED
40
40
39
OPTIONAL
230V WATER CIRCULATING PUMP(S)
CONNECTED FOR DIRECT CONTROL
THRU GEOTHERMAL LOGIC CONTROL
BLACK
B
A
21
9
6
4
7
3
1
YELLOW
23
BLUE/WHITE
5 COND. = Yellow fault light illuminated when fault indicated.
33
30
17
43
FLOW CENTER
RELAY 10
18
OUT
OUT
IN
IN
25
BROWN/WHITE
BLUE
2 H.P.S = Green fault light illuminated when fault indicated.
24
32
RED
BLACK
Y
24
YELLOW/RED
T ' STAT
24
OVERTEMP
LIMIT
RED
LINE VOLTAGE
BLUE/WHITE
3
PUSH
3
PUSH
3
23
DESUPERHEATER
CONTROL 6
BLACK
BLACK
RED
RED
4 LABEL
CIRCUIT 9
BREAKER
Compressor
R
40
BLACK/WHITE
30
29
BLACK
N
RED
RED
I
C
R
BLACK
28
20
BLACK/WHITE
RED/WHITE
1 FOR ANTIFREEZE LOOP APPLICATIONS, CHANGE
LOW PRESSURE SWITCH TO YELLOW LEADS
ON LPC TERMINALS OF GEOTHERMAL LOGIC
CONTROL BOARD
REVERSING
VALVE
35
WATER
TEMPERATURE
LIMIT 18
BLACK
GREEN
WHITE
DESUPERHEATER
PUMP MOTOR
THERMISTOR
THERMISTOR
3-PIN PLUG
YELLOW
PINK
17
DESUPERHEATER
TEMP. SENSORS
3
2
1
BLUE
BLACK/WHITE
BLACK/WHITE
BLACK
WATER SENSORS
22
BLUE
BROWN/WHITE
BLACK/
WHITE
T1
T2
YELLOW/RED
YELLOW
RED
BLACK
L1
L2
1
RED
RED
PUMP OUTPUT
BLACK
GREEN
POWER
Manual 2100-537B
Page
49 of 49
L1
S
C
99
Low Voltage
3-AMP
CIRCUIT BREAKER
N
PUMP
OUTPUT
Factory
Field
WARNING
L2
Optional
4117-101 B
USE COPPER CONDUCTORS
ONLY SUITABLE FOR AT LEAST
75° C.
!
24 VAC FROM AIR HANDLING UNIT
LOW
PRESSURE
SWITCH
HIGH
PRESSURE
SWITCH
LIMIT
THERMISTOR
THERMISTOR
L2
Compressor
Contactor
Wire Identification numbers
for Bard use only.
High Voltage
*ELECTRICAL SHOCK HAZARD
*DISCONNECT POWER BEFORE
SERVICING.
DANGER
COMPRESSOR
CONTACTOR
FS2
FS
LP1
LP2
L
CO
L
CO
HP2
Y
CCG
T2
7
COMPRESSOR
STAGING SOLENOID
Y1
CC
4
REVERSING VALVE SOLENOID
GEOTHERMAL C1
LOGIC
HP1
CONTROL
COG
C
IN
OUT
OVER-TEMP
LIMIT
A
COG
C
Compressor
R
N
LINE
VOLTAGE
DESUPERHEATER
LOGIC CONTROL
4-PIN BLOWER
POWER PLUG
FLOW CENTER RELAY
3-PIN PLUG
IN
DESUPERHEATER
LOGIC
OUT
CONTROL
Y
R
3
4
DESUPERHEATER
PUMP MOTOR
3
FLOW CENTER
TERMINAL BLOCK
Capacitor
T1
6
2
2
R1
!
L1
Compressor
Contactor
9
1
1
A
Y2
O
E
R
I
PUMP
OUTPUT
FLOW CENTER RELAY
3-AMP
CIRCUIT BREAKER
L
LINE
VOLTAGE
DESUPERHEATER
LOGIC CONTROL
208/230-60-1 POWER SOURCE
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