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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
WATER HEATER
AQUASTAT
OR THERMOSTAT
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
TACO
3 WIRE ZONE VALVE
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 CONTOL
WITH OPTIONAL PRIORITY
24 VAC
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
TO CIRCULATOR
OR BOILER
AQUASTAT RELAY
DRY
CONTACTS
N/O COM
ZONE 6 RELAY
N/C
END
SWITCH
A
BOILER
END
SWITCH
B
PUMP
TO CIRCULATOR
OR BOILER
AQUASTAT RELAY
Operation/External Diagnostics:
When any thermostat calls for
heat, the appropriate zone valve is energized and the yellow light goes
on. When the zone valve is fully open, the red light goes on and ener-
gizes the end switch relays. The green light should always be on, indi-
cating that power is connected.
Priority Operation:
When zone 6 is switched to the priority setting
and is actuated, all other zones will stop operation until zone 6 is sat-
isfied. When zone 6 is not switched to priority, all zones will operate
independently.
Note:
When a circulator is used on the priority zone
instead of a zone valve, jumper 3 and 4 of the priority zone.
Mode Operation:
When the mode switch is set to NORMAL, both end
switch relays will be energized if any zone is in operation. When the
mode switch is set to RESET, the end switch relay “A” will only be ener-
gized when the priority zone is in operation. The end switch relay “B”
will be energized when any zone is in operation
Power Input:
Connect 120 volt ac power input to leads on trans-
former. Neutral to white wire. Hot to black wire.
Expansion Connections:
Set the expansion switch to MASTER on the
zone valve control that has the designated priority zone or is utilizing
the PowerPort options. Set all other daisy chained controls to SLAVE.
Connect thermostat wire (18-22 gauge) between terminals 1, 2, 3, 4 on
the master control to the corresponding 1, 2, 3, 4 on the SLAVE control(s).
Controls may be daisy chained up to 20 zones using any combination
of Switching Relay -EXP or Zone Valve -EXP controls.
The Taco Connection:
Combine the reliability of the Taco Zone Valves,
Priority Zoning Circulators, Thermostats, and the “00” family of circula-
tors with the advanced features of the Taco Zone Controls to achieve
total system integration. No matter the application, Taco now provides
the products to maximize system performance while simplifying both
installation and service.
Wiring
Diagram
Specifications:
PRODUCT
NUMBER
TRANSFORMER
MAX OUTPUT
DIMENSIONS OF ENCLOSURE
NUMBER
OF ZONES
VOLTAGE
AT 24 VAC
WIDTH
HEIGHT
DEPTH
ZVC404-EXP 4 with Priority
120 VAC I
n
put
80 VA
11
3
⁄
4
"
7
1
⁄
2
"
3
"
ZVC406-EXP 6 with Priority
120 VAC I
n
put
80 VA
11
3
⁄
4
"
7
1
⁄
2
"
3
"
All
Zo
n
e Valve Co
n
trols are relay type DPDT a
n
d have a si
n
gle phase
m
otor rati
n
g per zo
n
e
of
1
⁄
6
hp (5A) @ 120 VAC.
Instruction Sheet
ZVC404-EXP & ZVC406-EXP Zone Valve Control
Features:
External Indicator Lights
Plug-In PowerPort Cards
Switchable Priority
Simplified Wiring
Add-On Power Controls
Works with 2, 3, or 4-Wire
Zone Valves
UL Approved
Fuse Protected
100% Factory Tested
Isolated End Switch
Expandable to 20 Zones
Extra Set of Dry Contacts
Contractor Friendly PC
Board Layout
Universal Thermostat
Compatibility
Sturdy Screw Connections
Extended 3 Year Warranty
Made in the USA
Warning:
Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. Failure to follow this instruction can result in personal injury or death and/or property
damage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with
5 in.lbs. max torque.
Do it Once. Do it Right.
TACO, INC.
, 1160 Cranston Street, Cranston, RI 02920
Telephone: (401) 942-8000
FAX: (401) 942-2360.
TACO (Canada), Ltd.
, 6180 Ordan Drive, Mississauga, Ontario L5T 2B3.
Telephone: 905/564-9422.
FAX: 905/564-9436.
Visit our web site at:
http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
N/O COM N/C
TT
BOILER
HOT
NEUTRAL
120 VAC
(See Note)
SYSTEM
CIRCULATOR
DHW
CIRCULATOR
END
SWITCH
A
BOILER
END
SWITCH
B
PUMP
Installation of
Optional System
and/or DHW Circulator