Taco SR501 User Manual

34
2 ZVC404/406 Connected Together with Priority
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODE
NORMAL RESET
FUSE (3 AMP MAX)
ZONE 1
TT
TT TT TT
ZONE 4 PRIORITY
OFF
ON
N/O COM
N/C
ZONE 4 RELAY
DRY
CONTACTS
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
THERMOSTAT
THERMOSTAT
THERMOSTAT
1234
ZONE 3
MOTOR
END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
POWER
END
SWITCH
EXTRA
END
SWITCH
MAIN
24
VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1234
ZONE 4
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODE
NORMAL RESET
FUSE (3 AMP MAX)
ZONE 1
TT
TT TT TT
ZONE 4 PRIORITY
OFF
ON
N/O COM
N/C
ZONE 4 RELAY
TO BOILER AQUASTAT RELAY
DRY
CONTACTS
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
THERMOSTAT
THERMOSTAT
THERMOSTAT
1234
ZONE 3
MOTOR
END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
POWER
END
SWITCH
EXTRA
END
SWITCH
MAIN
24
VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
BOILER
H
N
A
AQUASTAT ON
DHW HEATER
PRIORITY
ON
PRIORITY
ON
TO BOILER
AQUASTAT RELAY
ZVC 404
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
1234
ZONE 4
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
TTT
TTT

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