Taco SR501 User Manual

5
SR502/503 Switching Relay Controlling Another SR502/503 Switching Relay
SR 503
24 VAC
POWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
120 VOLT CIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
JUMPER
N P ZC H X ZR
1
X
2
ZONE 2
POWER
ZONE 1
ZONE 3
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
TT T
SR 503
ZONE1 ZONE2 ZONE3
24 VAC
POWER
FUSE 1 AMP
120 VOLT
CIRCULATORS
ZONE1 ZONE2 ZONE3
120 VAC POWER
JUMPER
N P ZC H X ZR
1
X
2
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
T
A
T
BOILER
H
N
SLAVE
MASTER
AQUASTAT
ON DHW
HEATER
ZONE 2
POWER
ZONE 1
ZONE 3
DHW
HEATER
CIRCULATOR
PRIORITY ON
VIA JUMPER
PLACEMENT
PRIORITY OFF
VIA JUMPER
PLACEMENT

Taco SR501 Specifications

General

Model	SR501
Category	Control Unit
Input Voltage	120 VAC
Frequency	60 Hz
Switch Type	SPDT
Enclosure Rating	NEMA 1
Type	Relay
Operating Temperature	0°C to 40°C
Relay Output	24 VAC