SECTION
15
Technical Information SR501 Switching Relay THERMOSTAT
THERMOSTAT
TYPICAL WIRING
ALTERNATIVE WIRING
SR501 1 ZONE SWITCHING RELAY
R W T T
SR501 1 ZONE SWITCHING RELAY
24 VAC
R W T T
COM
15
24 VAC COM
technical information
POWER T STAT
POWER T STAT
120 VAC INPUT
120 VAC INPUT
4 4 6 6 5 N H 3 N/O N/C N/C N/O
4 4 6 6 5 N H 3 N/O N/C N/C N/O
JUMPER
JUMPER TO: ZC TO: ZR
TO: TT ON BOILER
TO: 120 VAC POWER
TO: 120 VAC POWER
CIRCULATOR
CIRCULATOR
technical tips
SR504 & SR506 Switching Relay THERMOSTATS
THERMOSTATS
COLD START BOILER APPLICATION
TANKLESS COIL BOILER APPLICATION
24 VAC POWER
24 VAC POWER
SR503
SR503
ZONE1 ZONE2 ZONE3
ZONE1 ZONE2 ZONE3
THREE ZONE SWITCH RELAY WITH OPTIONAL PRIORITY FUSE 1 AMP
N
P
ZC
THREE ZONE SWITCH RELAY WITH OPTIONAL PRIORITY POWER ZONE 1 ZONE 2 ZONE 3
H
X2 X1 ZR ZONE1 ZONE2 ZONE3
FUSE 1 AMP
N
JUMPERS
F.W. Webb Heating Catalog
H
X2 X1 ZR ZONE1 ZONE2 ZONE3
TO: 120 VAC POWER (NEUTRAL)
TO: 120 VAC POWER (HOT)
TO: “TT” ON AQUASTAT CONTROL
ZC
JUMPERS
TO: 120 VAC POWER (NEUTRAL)
TO: “TT” ON AQUASTAT CONTROL
P
POWER ZONE 1 ZONE 2 ZONE 3
TO: 120 VAC POWER (HOT) 120 VOLT CIRCULATORS
TO: “ZC” ON AQUASTAT CONTROL
120 VOLT CIRCULATORS
TO: “ZR” ON AQUASTAT CONTROL
F.W. Webb Company
279