Wiring Guide
58
3 Wire Thermostat Connected to TACO Non-Expandable Switching Relay
TO: "TT"
ON BOILER
H
N
120 VAC
INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNH NH
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
BOILER
JUMPER
T
T
T
THERMOSTATS
T
3 WIRE
THERMOSTAT
COM
570 Zone Valve Connected to TACO Switching Relay
T
1
2
3
24 VAC
TRANSFORMER
THERMOSTAT
120 VAC INPUT
THREE ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2
ZONE 3
PRIORITY
ZONE1 ZONE2
ZONE3
PRIORITY
SR 503-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
120 VAC
ZR
HHNHNHNH NH
ZONE 2
POWER
ZONE 1
ZONE 3
LED
INDICATORS
ZONE 3
PRIORITY
OFF
ON
TO: "TT" ON AQUASTAT
CONTROL
24 VAC
COM
JUMPER