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 energizes the end switch relay. The green
light should always be on, indicating 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 satisfied. 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,
the end switch relay will be energized if any zone is in opera-
tion. When the switch is set to RESET, the end switch relay
will only be energized if priority zone is in operation.
The Taco Connection: Combine the reliability of the Taco
Zone Valves, Priority Zoning Circulators, Thermostats, and the
“00” family of circulators 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 instal-
lation and service.
Wiring
Diagram
Specifications:
PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURE
NUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC404 4 with Priority 120 VAC Input 40 VA 10
1
⁄
4
" 6
3
⁄
4
" 2
3
⁄
4
"
ZVC406 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 & ZVC406 Zone Valve Control
Features: External Indicator Lights
Switchable Priority
Simplified Wiring
Works with 2, 3, or 4-Wire Zone Valves
Compact Design
Fuse Protected
100% Factory Tested
Isolated End Switch
Extra Set of Dry Contacts
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
UL Approved
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.
Installation of
Optional System
and/or DHW Circulator
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