2
R
24 VAC return
C
24 VAC common
G , G2, G3 low/medium/high fan
Y1
chilled water valve (4 pipe)
or hot/chilled water valve
(2 pipe)
Y2
2-staged cooling
The Thermostat Backplate
SCALE 1 : 1
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
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
