Taco SR501 User Manual

11
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON OFF
PRIORITY
120V RELAY
FUSE 1 AMP
ZONE 1 ZONE 2 ZONE 3 ZONE 4
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
TT T
BOILER
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON OFF
PRIORITY
120V RELAY
FUSE 1 AMP
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
TT T
H
N
T
DHW
CIRCULATOR
JUMPER
R
W
T
T
COM
24
VAC
N/O N/C N/C N/O
NH3
44
5
6
6
SR501
POWER T STAT
120 VAC INPUT
1 ZONE SWITCHING RELAY
AQUASTAT ON
DHW HEATER
A
T
MASTER
SLAVESLAVE
REMOVE
JUMPER
REMOVE
JUMPER
PRIORITY OFF
PRIORITY OFF
24 VAC POWER
24 VAC POWER
SR501 Switching Relay Controlling 2 SR504/506 Switching Relays

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