Taco SR502 User Manual

7
Two SR504/506 Switching Relays Connected Together
BOILER
H
N
A
AQUASTAT ON
DHW HEATER
TT T
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4
POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
JUMPER
TT T
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4
POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
JUMPER
DHW
HEATER
CIRCULATOR
OUTPUT
NOT
USED
PRIORITY
ON
PRIORITY
ON

Taco SR502 Specifications

General

Zones	2
Frequency	60 Hz
Relay Type	SPDT
Mounting	Wall mount
Input Voltage	120 VAC
Output Voltage	24 VAC
Enclosure Type	Plastic
Terminal Type	Screw terminal