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Wiring Guide

ManualsBrandsTaco ManualsHeating Supplies4 Zone Switching Relay w/ Priority
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SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
TO: "TT" ON BOILER
DHW HEATER
CIRCULATOR
Note: If Zone Control comes on without a call for heat,
reverse Reset Override input (1 & 2) wires on SR501-EXP.
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
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
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
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
THERMOSTATS
T
T
T
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
ZONE VALVE SYSTEM
CIRCULATOR
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
MASTER
PRIMARY SYSTEM
CIRCULATOR
(Optional)
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O N H
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
WR
X1A2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
Connecting a DHW Heater to an Existing Heating Only Zone Valve Control
Using an SR501-EXP and PC700 Boiler Reset Control
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
DHW HEATER
CIRCULATOR
TO: "TT" ON BOILER
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
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
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
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
THERMOSTATS
T
T
T
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
ZONE VALVE SYSTEM
CIRCULATOR
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O N H
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
WR
X1A2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
18