Specifications

43
PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE 7 AMP MAX
TT
TT TT TT TT TT
ZONE 6
OFF
ON
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
1234
ZONE 4
1234
ZONE 5
1234
ZONE 6
MODE
NORMALRESET
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
TACO
3 WIRE ZONE VALVE
1
2
3
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN, SELF CLOSING)
JUMPER
3 & 4
1234
MASTER
SLAVE
POWER
CONTROLS
PLUG-IN
CARDS
PRIORITY
TACO, INC ZVC406-EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6

SEE NOTE
EXPANSION
ZVC 406-EXP
SIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POWER IN
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
N/O COM
ZONE 6 RELAY
N/C
END
SWITCH
A
PUMP
END
SWITCH
B
BOILER
SYSTEM
CIRCULATOR
H
N
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE 7 AMP MAX
TT
TT TT TT TT TT
ZONE 6
OFF
ON
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
1234
ZONE 4
1234
ZONE 5
1234
ZONE 6
MODE
NORMALRESET
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
TACO
3 WIRE ZONE VALVE
1
2
3
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN, SELF CLOSING)
JUMPER
3 & 4
1234
MASTER
SLAVE
POWER
CONTROLS
PLUG-IN
CARDS
PRIORITY
TACO, INC ZVC406-EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6

SEE NOTE
EXPANSION
ZVC 406-EXP
SIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POWER IN
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
DRY
CONTACTS
N/O COM
ZONE 6 RELAY
N/C
END
SWITCH
A
PUMP
END
SWITCH
B
BOILER
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
BOILER
#2
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC702
STAGE
1
STAGE
2
BOILER
#1
DHW
DEMAND
24 VAC
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Normal
Priority Zone: On or Off
SWITCH SETTINGS
Master/Slave: Slave
Reset/Normal: Normal
Priority Zone: Off
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
MASTER
SLAVE
INDIRECT WATER HEATER
AQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHW
CIRCULATOR