Zone Controls Wiring Guide

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
Off-Enable On-Control
Boiler Operation
Factory
Installed
Transformer
Pump
Outdoor
Sensor
H
N
Motor End Switch Motor End Switch
Boiler
Sensor
Supply
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
Pump
H
N
Power
Input
DHW
Circ.
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
PRIORITY
ZONE
JUMPER
3 & 4
ZVC 403 – 4
THREE ZONE
ZONE VALVE CONTROL
WHITE
BLACK
POWER IN
24 VAC
TO
CIRCULATOR
DRY
CONTACTS
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
THREE ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1 ZONE2
THERMOSTATS
(24 VAC)
SR 503-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XX
AB
C
RW
CRW
CRW
C
12
END SWITCH THERMOSTATS
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H NH NH NH NH NH
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
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE3 ZONE3
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
LED
INDICATORS
T
T
T
T
THREE ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1 ZONE2
THERMOSTATS
(24 VAC)
SR 503-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XX
AB
C
RW
CRW
CRW
C
12
END SWITCH THERMOSTATS
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H NH NH NH NH NH
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
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE3 ZONE3
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
LED
INDICATORS
T
T
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
Outdoor
Sensor
MASTER
SLAVE
See NOTE 1
See NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
61