What does the end switch do on a zone valve?
End switches in each zone valve control the central circulator and the burner. On a call for heat, the valve is opened. When it reaches the fully open position, the end switch “makes” (makes contact), causing the aquastat relay to pull in, starting the circulator and the burner.
What are the wires on a zone valve?
Yellow wire connections at the zone valve: the pair of yellow wires on a zone valve are the zone valve motor actuator control. One yellow wire connects to the C terminal on the low voltage transformer. The second yellow wire connects to a “heat on” wire from the room thermostat.
How do I know if my zone valve is not working?
To test if your zone valve is working, switch off demand for your hot water (you can do this via the timer – set Hot Water to Off). Now create demand for central heating – turn up the thermostat and make sure the timer is set to ‘On’ or ‘Continious’.
What are the yellow wires in a zone valve?
At HONEYWELL ZONE VALVE INSTRUCTIONS we describe how the red and yellow wires for a zone valve are usually connected: One yellow wire connects to the C terminal on the low voltage transformer. The second yellow wire connects to a “heat on” wire from the room thermostat.
Where should zone valves be placed?
The zone valve needs to be positioned after the boiler and circulator of the central heating system. They can be located either on the hot side (before the hot water goes into the zone) or on the cold side (after the water goes throughout the building).
Should zone valves return or supply?
Install zone valves on the supply side of zone circuits to block upward gravity flow. Install a swing check valve on the return side of each zone to block the return side. The latter is necessary because buoyancy forces try to establish two-way flow in the return pipe.
Can you leave a zone valve on manual?
Leaving the valve in the manual position will not harm the boiler, but you will always have heating as the boiler maintains its temperature for the hot water.
What position should zone valve be in?
Otherwise, this wiring is in series with the valve on/off signal. The zone valve needs to be positioned after the boiler and circulator of the central heating system. They can be located either on the hot side (before the hot water goes into the zone) or on the cold side (after the water goes throughout the building).