Taco ZVC404

TACO ZONE CONTROLS WIRING GUIDE
Pages
Switching Relays – Single Zone Wiring 2 – 2
Switching Relays – Oil Boiler Wiring Safety Notice 2 3– 4
Switching Relays – N
ON EXP Connected Together with Priority 5 – 11
Switching Relays – EXP Connected Together with Priority 12 – 14
Switching Relays – Multiple Indirect Hot Water Heaters 15 – 16
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 17 – 28
Zone Valve Controls – N
ON EXP Connected Together with Priority 29 – 34
Zone Valve Controls – EXP Connected Together with Priority 35 – 38
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 39 – 46
Hydro Air Fan Controls (HAFC 101 & 201) 47 – 51
Specialty Thermostat and Zone Valve Wiring 52 – 56
Radiant Mixing Block 57 – 58
X-Pump Block 59 – 61
iSeries Mixing Valves 62 – 63
Low Water Cutoffs and Electric Water Feeders 64 – 79
Aquastat Wiring 80 – 86
Instruction Sheets 87 – 97
Standard Terms and Definitions – 98
Cross Reference 99 – 100
Do it once.
Do it right.
© Taco Catalog No. 100-9.0 Effective Date: July 1, 2010
Supersedes Date: July 1, 2007

Taco ZVC404 Specifications

General

Model	ZVC404
Type	Zone Valve Control
Voltage	120V AC
Number of Zones	4
Enclosure Type	Plastic
Terminal Type	Screw terminals
Compatibility	2-wire or 3-wire zone valves
Transformer	40VA
Power Consumption	6VA (standby)
Operating Temperature	0 to 40°C (32 to 104°F)

Summary

TACO Zone Control Product Overview

Safety Notices

Checking and Correcting Power Sources

Guide on checking for two power sources and correcting wiring for safety.

PC700 Boiler Reset Control Integration

PC700 Connected to SR501-EXP Switching Relay

Wiring diagram showing PC700 connected to an SR501-EXP switching relay.

PC700 Boiler Reset Control to EXP Switching Relay

Wiring Diagram for PC700 to SR504-EXP

Wiring diagram illustrating PC700 connected to an SR504-EXP switching relay.

PC700 Boiler Reset Control to 2 EXP Switching Relays

Wiring Diagram for PC700 to two SR504-EXP

Wiring diagram showing PC700 connected to two SR504-EXP relays.

PC705 Variable Speed Pump Injection Control to EXP Zone Valve Control

Wiring Diagram for PC705 to ZVC406-EXP

Wiring diagram showing PC705 connected to a ZVC406-EXP zone valve control.

PC700 Boiler Reset Control to 2 EXP Zone Valve Controls

Wiring Diagram for PC700 to two ZVC406-EXP

Wiring diagram showing PC700 connected to two ZVC406-EXP controls.

Radiant Mixing Block (RMB)

Radiant Mixing Block, Single Zone

Wiring diagram for a single zone Radiant Mixing Block.

X - Pump Block (XPB)

X - Pump Block, Single Zone

Wiring diagram for a single zone X-Pump Block.

iSeries Mixing Valve

iValve, 2-Way Injection, Single Zone

Wiring diagram for iValve 2-way injection, single zone.

Taco LN and LTA-2 Series Low Water Cutoffs

Using Burner Circuit Power Source

Wiring diagram for LN/LTA-2 LWCOs using burner circuit power.

Using Power Source Other Than Burner Circuit

Wiring diagram for LN/LTA-2 LWCOs using an alternate power source.

Taco Low Water Cutoff Replacement Guide

Taco LF Series LWCO Wiring Cross Reference

120 VAC Models with 120 VAC Burner Circuits

Cross-reference for 120VAC LF LWCOs with 120VAC burner circuits.

120 VAC Models with 24 VAC Burner Circuits

Taco LWCO & Electric Water Feeder Cross Reference

Aquastat Wiring Diagrams

Honeywell L8124 A & C or Equivalent

Aquastat Wiring Diagrams (Continued)

Honeywell L8124 G & L or Equivalent

Honeywell L8124 A & C or Equivalent (Switched Relay)

Honeywell L8124 M or Equivalent

Honeywell L8124 G & L or Equivalent (Switched Relay)

Honeywell L8124 M or Equivalent (Switched Relay)

SR501 Switching Relay Instruction Sheet

Wiring Diagrams and Operation

Provides wiring diagrams, operation, power, and jumper instructions.

SR502 & SR503 Switching Relay Instruction Sheet

SR504 & SR506 Switching Relay Instruction Sheet

SR501-EXP Switching Relay Instruction Sheet

SR503-EXP, SR504-EXP & SR506-EXP Switching Relay Instruction Sheet

Wiring Diagrams and Jumper Placement

Provides wiring diagrams, jumper placement, power input, and expansion connections.

ZVC404-EXP & ZVC406-EXP Zone Valve Control Instruction Sheet

ZVC404 & ZVC406 Zone Valve Control Instruction Sheet

Wiring Diagrams and Installation

Provides wiring diagrams, installation, and diagnostic info for ZVC404/406 controls.

TACO Zone Controls Cross-Reference

TACO Zone Controls Cross-Reference (Continued)