Taco SR502

63
iSeries-R
B
C
A
B
C
A
Supply
Sensor
NPZCHX 1 ZR
X
2
ZONE1 ZONE2 ZONE3
ZONE1 ZONE2 ZONE3
FUSE 1 AMP
24 VAC
POWER
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
SR 503
24 Volt
Transformer
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
Outdoor
Sensor
DHW
Circ.
A
DHW Aquastat
Thermostats
T
T
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
THREE ZONE ZONE VALVE CONTROL
ZVC 403
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
END
SWITCH
ZONE 1
TT
ZONE 2
TT
ZONE 3
TT
FUSE
(5 AMP MAX)
N/O N/CCOM
iValve, 4-Way Mixing Working with Zone Valve Control
iSeries-R
Factory
Installed
Transformer
POWER IN
Thermostats
T
T
Motor End Switch Motor
End Switch
Power
Input
Outdoor
Sensor
Boiler
Sensor
Supply
Sensor
Boiler
Sensor
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard