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Installation Instructions
1
The Thermostat Backplate
IMPORTANT: This thermostat requires both R (24 VAC Power) and C (24 VAC
Common) wires be connected to the backplate terminals to operate properly.
To remove the thermostat backplate:
Gently separate the display from the
base by pulling from the center.
Y2
RS
R
G
Y1
G3
W1
G2
C
H20
CK1
R
24 VAC return
C
24 VAC common
G , G2, G3
first/second/third stage fan
Y1
chilled water valve (4 pipe)
or hot/chilled water valve
(2 pipe)
Y2
larger flow 2nd chilled water
valve for special fancoil
application
W1
hot water valve (4 pipe) or
strip heat (2 pipe)
H20
2 pipe water temp sensor
(open = hot, closed = chilled)
CK1
Dry Contact
RS
wired remote 10K NTC
thermistor
