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Comp
Relay
CC
CCG
Off On
FP1 Low Temp
FP2 Low Temp
R
C
BR
BRG
Test
JW3
JW2
Thermostat Connections
The thermostat should be wired directly to the CXM/
DXM board as shown in Figure 15a. Consult the
Thermostat section for specific wiring.
Water Solenoid Valves
When using solenoid valves on ground water installa-
tions. Figure 17 illustrates a typical well water control
valve wiring. A slow closing valve may be required to
prevent water hammer. When using an AVM -Taco Slow
Closing valves on GT-S Series equipment the following
schematic should be utilized. The valve takes approxi-
mately 60 seconds to open (very little water will flow
before 45 seconds) and activates the compressor only
after the valve is completely opened by closing its end
switch. Only relay or triac based electronic thermostats
should be used with the AVM valve. When wired as
shown, the valve will operate properly with the following
notations:
1-The valve will remain open during a unit lockout.
2-The valve will draw approximately 25-35 VA through
the “Y” signal of the thermostat.
This can overheat the
anticipators of electromechanical thermostats.
Therefore only relay or triac based thermostats should be
used.
ELECTRICAL - LOW VOLTAGE
Figure 15a. Low Voltage Field Wiring.
Freeze Protection
The CXM/DXM control allows the field selection of
source fluid freeze protection points. The factory setting
of FP1 is set for water (30
°
F). In earth loop applications
jumper FP1- Antifreeze should be clipped as shown in
Figure 15b to change the setting to 10
°
F, a more suitable
temperature when using antifreezes in colder earth loops.
Figure 16. Accessory Wiring
Figure 17. Well Water AVM Valve Wiring
FCR
CRR
CCM PCB
HPS
LPS
Y
X
C
T
Thermostat Connection
See Thermostat section for Wiring
Details
C
A
L
R
O
Y
CRC
Grnd
L2
L1
T2
T1
CC
Antifreeze -
Brown
Well - Blue
Switch blue and brown freezestat wires on CCM-LPS when
using antifreeze in systems. Tape off remaining lead.
Figure 15b. Changing FP1-Freeze Protection
Setpoint
CXM PCB
Clip this FP1
jumper for anti-
freeze systems
Rev. 4/3/00 m
Accessory Connections
A terminal paralleling the compressor contactor coil have
been provided on the CXM/DXM control of the GT-S
line. "A" has been provided to control accessory devices,
such as water valves, electronic air cleaners, humidifiers,
etc.
This terminal should be used only with 24 volt
signals and not line voltage signals.
This signal oper-
ates with the compressor contactor. See Figure 16 or the
wiring schematic for details.
C
Genesis Series
C
Thermostat
Y
1
2
3
Y
AVM
Taco Valve
Heater Switch
CXM Control
