Installation Guide

56
3 Wire Thermostat Connected to TACO Non-Expandable Switching Relay
TO: "TT"
ON BOILER
H
N
120 VA
C
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
X X R W R W R W R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
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
Power Stealing Thermostat Wiring
May Need To Connect 1000 (1K) Ohm 1/2 Watt Resistor Between W and C
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
X X R W R W R W R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
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
2 WIRE POWER STEALING
THERMOSTAT
1000 Ohm (1K) 1/2 Watt Resistor
COM
R W
24
VAC
T T
THERMOSTAT
1000 Ohm (1K)
1/2 Watt Resistor