Taco ZVC405

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 ZVC405 Specifications

General

Zones	5
Voltage	24VAC
Input Voltage	120VAC
Transformer	40 VA
Priority Zone	Yes
Switching	SPDT
Relay Type	Electromechanical
Control Signal	24 VAC
Housing Material	Plastic

Summary

Switching Relays - Single Zone Wiring

SR501 Switching Relay Wiring

Diagrams for typical and alternative wiring of the SR501 switching relay.

Switching Relays - Oil Boiler Wiring Safety Notice

SAFETY NOTICE

Important safety warnings regarding power sources for oil boilers.

How to correct the wiring

Guidance on correcting wiring to prevent boiler activation issues.

Switching Relays - NON EXP Connected Together with Priority

SR502503 Switching Relay Controlling Another SR502503 Switching Relay

Switching Relays - EXP Connected Together with Priority

SR501-EXP Switching Relay Controlling Another SR504506 Switching Relay

Switching Relays - Multiple Indirect Hot Water Heaters

2 Indirect Water Heaters with Priority Connected to Standard Switching Relays

Switching Relays - EXP Connected To Reset Controls (PC700, 702 & 705)

PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay

Wiring diagram for PC700 boiler reset control with SR501-EXP.

SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay

Wiring diagram for SR501-EXP and PC700 with an existing switching relay.

PC700 Boiler Reset Control Connected to EXP Switching Relay

Wiring diagram for PC700 boiler reset control with an EXP switching relay.

PC702 2-Stage Boiler Reset Control Connected to EXP Switching Relay

Wiring diagram for PC702 2-stage boiler reset control with EXP relay.

PC705 Variable Speed Pump Injection Control Connected to EXP Switching Relay

Wiring diagram for PC705 variable speed pump control with EXP relay.

Zone Valve Controls - NON EXP Connected Together with Priority

2 ZVC404406 Connected Together with Priority

2 EXP Zone Valve Controls Connected Together with System Pump

Zone Valve Controls - EXP Connected Together with Priority

2 EXP Zone Valve Controls Connected Together with DHW Pump

Zone Valve Controls - Connected To Reset Controls (PC700, 702 & 705)

PC700 Boiler Reset Control Connected To EXP Zone Valve Control

Wiring diagram for PC700 boiler reset control with EXP zone valve control.

PC702 2-Stage Boiler Reset Control Connected To EXP Zone Valve Control

Wiring diagram for PC702 2-stage boiler reset control with EXP zone valve control.

PC705 Variable Speed Pump Injection Control Connected To EXP Zone Valve Control

Wiring diagram for PC705 pump injection control with EXP zone valve control.

Low Water Cutoffs and Electric Water Feeders

Wiring for Boilers with Honeywell Control Center Model R8285 or Equivalent

Wiring Taco LN and LTA-2 Series Low Water Cutoffs Using Burner Circuit Power Source

Wiring Taco LT Series (1 st generation, -1) Low Water Cutoffs Using Burner Circuit Power Source

Wiring Taco LF Series Low Water Cutoffs Using Burner Circuit Power Source

Aquastat Wiring

Aquastat Wiring to Honeywell L8124 A & C or Equal

Aquastat Wiring to Honeywell L8124 E or Equivalent

Instruction Sheets

Instruction Sheet SR501 Switching Relay

Instruction sheet for the TACO SR501 Switching Relay.

Instruction Sheet SR501-EXP Switching Relay

Instruction sheet for the TACO SR501-EXP Switching Relay.

Instruction Sheet SR504 & SR506 Switching Relay

Instruction sheet for TACO SR504 and SR506 Switching Relays.

Instruction Sheet ZVC403 & ZVC405 Zone Valve Control

Instruction Sheet ZVC404 & ZVC406 Zone Valve Control

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