A SERVICE OF

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Manual 2100-537
I
Page 23 of 54
FIGURE 6
THERMOSTAT WIRING
Notes:
A
W2
Y1
NOTE: W1=FIRST STAGE AUX. HEAT
Heat Pump
in GTB1-A
Y2
R
B
Y2
W2
C
W1
CO
O
CO
Y1
L
C
W1
Optional Wiring
R
Y2
G
Thermostat
Tap Select Control
A
Optional
Sensor
1
3
Duct Heater
8403-060
3.) Motorized valve with or without end
Water Loop)
3 Stage Heat,
2 Stage Cool
A Coil Overflow
2
Optional
Water Loop)
White/Black
White
Green
(Use With Water/
Green/Red
Motorized Valve
Without End Switch
Motorized Valve
With End Switch
(Use with Water/
Black
A
Thermostat
A
B
Low Voltage Connection Diagram
B
O/B
Y2
L
G
Y1
ground water/water loop.
Field Installed Wiring
switch should be used when installing a
W2=SECOND STAGE AUX./EMERGENCY HEAT
C
R
Y1
G
L
O/B
Optional
W2
W1/E
C
R
1.) points connect when duct heater
not used.
2.) wire not used when motorized
valve with end switch is present.
NOTE: "O/B" TERMINAL
MUST BE PROGRAMMED
TO ENERGIZE IN COOLING
4117-102 C
Terminal Strip
in GTC*S2-D