Q:

How is Honeywell zone valve wiring used?

A:

Quick Answer

Honeywell zone valve wiring is used for hydronic or hot water heating systems. The wiring causes each thermostat to call for heat. The zone valve fully opens, causing the end switch to connect another pair of wires that turn the circulator pump to the boiler.

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Full Answer

Honeywell zone valve wiring setups typically have a separate zone valve that is installed in the pipe leading to and from each zone. Zone valves are located where the water is cooler, since the valves work more favorably in cooler temperatures.

Every zone valve is regulated by its own individual thermostat. The end switches located in each zone valve control the central burner and circulator. When the water system calls for heat, the valve begins to open. After fully opening, the end switch makes contact, which causes the aquastat relay to retract, outsetting the circulator and burner. If at any point the circulator control and high limit switches close, the circulator and burner start up again.

The switches within the wiring setup are wired in parallel directions to ensure that when the zone calls for heat, the circulator and burner are still powered. When the system is properly regulated, the circulator and burner then shut down.

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