Wiring Guide
iSeries-R
B
C
A
B
C
A
Supply
Sensor
H
N
Power
Input
C R
24 VAC
POWER INPUT
SENSOR
COMMON
BOILER
SUPPLY
OUTDOOR
POWER
GREEN
SENSOR
ERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
DHW
Circ.
iValve, 3-Way Mixing Working with SR502/503 Switching Relay with DHW Priority
24 Volt
Transformer
C R
24 VAC
POWER INPUT
SENSOR
COMMON
BOILER
SUPPLY
OUTDOOR
POWER
GREEN
SENSOR
ERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
M
M
H
N
iValve, 4-Way Mixing Working with Zone Valve Control
iSeries-R
Factory
Installed
Transformer
T
T
Motor
End Switch
Motor
End
Switch
Power
Input
Outdoor
Sensor
Boiler
Sensor
Supply
Sensor
Boiler
Sensor
THREE ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2
ZONE 3
PRIORITY
ZONE1
ZONE2
ZONE3
PRIORITY
SR 503-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
120 VAC
ZR
HHNHNHNH NH
ZONE 2
POWER
ZONE 1
ZONE 3
LED
INDICATORS
ZONE 3
PRIORITY
OFF
ON
24 VAC
COM
24 Volt
Transformer
Outdoor
Sensor
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
PRIORITY
ZONE
JUMPER
3 & 4
ZVC 403 – 4
THREE ZONE
ZONE VALVE CONTROL
POWER IN
24 VAC
TO
CIRCULATOR
N/O
COM
N/C
PUMP END
SWITCH
FUSE
5 AMP
ZONE 3 PUMP
END SWITCH
THERMOSTATS (24VAC)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
POWER
LED
INDICATORS
ZONE 1 ZONE 2 ZONE 3
ISOLATED
XX
RW
RW RW
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
XX
ZONE 3
PRIORITY
OFF
ON
NOTE 2: When a circulator is
used on the priority zone
instead of a zone valve,
jumper 3 and 4 of the
priority zone.
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
CCC
See NOTE 1
T
T
24 VAC
WHITE
BLACK
THERMOSTATS
(24VAC)
INDIRECT
WATER HEATER
AQUATSTAT OR
THERMOSTAT
See NOTE 2
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
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