Taco SR501 User Manual

Radiant Mixing Block Connected to Zone Valve Control with System Pump Wired off the RMB
Radiant Mixing Block Connected to 2 EXP Switching Relays with DHW Pump
Supply
Sensor
Boiler
Sensor
M
M
H
N
Com Sup
Boil
Out Heat
Dem
Com Com
Boiler
Sys
Ret
RMB
Back of Control
Power
Input
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
FU S E
(5 AMP MAX)
N/O N/CCOM
POWER IN
Off-Enable On-Control
Boiler Operation
Factory
Installed
Transformer
Pump
Outdoor
Sensor
Thermostats
T T
H
N
Motor End Switch Motor End Switch
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
SR503-EXP
FUSE 1 AMP
24 V AC
POWER
ON
OFF
ZON E 3
PRIORITY
RESET NORMAL
POWER CONTROL
INTERFAC E
MASTER
SLAVE
1 234
EXPANSION
PLUG-IN CARDS
ZONE3ZONE2ZONE1
INPUT120 VOLT CIRCULAT ORS
POWERZONE3ZONE2ZONE1
ZRZC
END
SWITCH
XX
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
SR503-EXP
FUSE 1 AMP
24 V AC
POWER
ON
OFF
ZON E 3
PRIORITY
RESET NORMAL
POWER CONTROL
INTERFAC E
MASTER
SLAVE
1 234
EXPANSION
PLUG-IN CARDS
ZONE3ZONE2ZONE1
INPUT120 VOLT CIRCULATORS
POWERZONE3ZONE2ZONE1
ZRZC
END
SWITCH
XX
Boiler
Sensor
Supply
Sensor
Outdoor
Sensor
H
N
ComSup
Boil
Out Heat
Dem
Com Com
Boiler
Sys
Ret
RMB
Back of Control
Off-Enable On-Control
Boiler Operation
Power Cord
A
Pump
N
Thermostats
T
T
Thermostats
T
T
H
N
Power
Input
DHW
DHW
Circ.
Aquastat
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
58

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