10
R
W
C
T
T
com
power
zone
transformer
N LL
RELAY 1
C N/O N/C C N/O N/C
RELAY 2
CalefÞ!
single zone relay
4-wire zone valve
4-wire zone valve
4-wire zone valve
R W
24 VAC
T
T
R
W
R
W
End switch wires
L
N
A2 - Multiple thermostats
Hydronic diagram is for illustration purposes only and could be missing system components.
