Honeywell replacement valve heads are used when the motorised motor head of a 2 port or 3 port Honeywell valve fails. The good thing about these heads is if the valve body itself is still in good working order then the motor head can be replaced without having to drain the heating system and re-inhibit the water with extra time and expense. If you want to learn about motorised valves and the systems they belong to just watch these instructional videos below:
Only certain valve heads can be replaced by not draining the system. They are identified by a small round bump on the cover.
How to remove and install a new motor head:
1. Electrically isolate all components in the heating system but do not remove the wires for the old head yet. They help with a straight swap.
2. Remove the metal cover of the Motor head by loosening the single screw.
3. Locate the two screws that hold the motor head to the valve body and unscrew them.
4. Lay the old head to one side and fit the new motor head using the two screws attached.
5. Now change the remove each wire from the old head and replace straight away with the same colour wire of the new head. If you are replacing a 2 port valve head, electrically isolate the white wire. This is only needed for a 3 port valve to signal which outlet is open. The wires are: brown – live supply from thermostat or programmer, blue – neutral, green and yellow – earth, orange – permanent live to be switched, grey – wire used to signal to boiler and pump on 2 and 3 port valves, white – wire used to signal boiler and pump in 3 port valve only. (to be used in conjunction with grey wire)
6. Turn up the thermostat in the room and test the operation of the valve. If you have an assistant, they can operate the thermostat or programmer while you rest your finger on the motor arm (pictured) you should feel the valve motor open.
If you are waiting for a new valve head to arrive, you can manually operate these valves using the metal arm on the side. They can be latched open for draining down or filling the heating system on other jobs.