40
P
C70
2 2–St
age Boiler R
eset Contr
ol Connected T
o E
XP Zone V
alve Contr
ol
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
12
34
ZONE 1
12
34
ZONE 2
12
34
ZONE 3
12
34
ZONE 4
12
34
ZONE 5
12
34
ZONE 6
MODE
NORMAL
RESET
INDIRECT
W
ATER HEA
TER
AQUAST
AT
OR THERMOST
AT
PRIORITY
ZONE
2 WIRE ZONE V
A
LV
E
(NO END SWITCH)
TA
C
O
3 WIRE
ZONE
V
A
LV
E
1
2
3
JUMPER
3 & 4
MOTOR
END
SWITCH
THERMOSTAT
THERMOSTAT
THERMOSTAT
4 WIRE ZONE VALVE
(POWER OPEN, SELF CLOSING)
JUMPER 3 & 4
12
34
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
24 VAC
POWER IN
24 VAC
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
BOILER
#2
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC702
ST
AGE
1
ST
AGE
2
BOILER
#1
DHW
DEMAND
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
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
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
DHW CIRCULATOR TURNS ON
ONLY
WHEN PRIORITY ZONE CALLS.
DHW
CIRCULATOR
TT
T
