23
LED illuminates
with call for
heat.
LED illuminates
when end switch
closes.
ZONE #1
priority.
120 VAC output
to pumps.
System pump
(boiler pump)
status during
priority can be
changed with
jumper.
3 wire
communications
to expansion
board.
Power ON LED.
Dual labeled
T-stat terminals.
Compatible with
2, 3 and 4 wire
T-stats.
DHW (ZR/ZC)
closes only
during priority
call. Rated
for 120 VAC,
2 amps.
Master/Slave
jumper.
XX Closes for
heat demand
and DHW
demand. Rated
for 120 VAC
2 amps.
120 VAC input
power connection.
Zone valve
end switch
connection.
Zone valve motor
connections.
Transformer
connections.
