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 Input 80 VA 11
3
⁄
4
" 7
1
⁄
2
" 3"
ZVC406-EXP 6 with Priority 120 VAC Input 80 VA 11
3
⁄
4
" 7
1
⁄
2
" 3"
All
Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone
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.
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