Looking for a wee bit of help with a new room stat I’ve just bought.
I’m looking to replace an antiquated Honeywell mech. stat with a Honeywell DT200 (Digital).
I’ve discovered that the original has 4 wires, two red, two blue (2 two core cables). The two blue wires are connected to the same pole – no problem.
The reds, however, are connected to two different poles. There is also a pole on the stat that has no wires connected.
I suspect that one cable is connected to the boiler and the other to the pump (although I guess it could be the motorised valve!!??).
The heating system is pretty old and has only one such valve and no rad stat, trad boiler etc.
The original stat must be about 25 years old and seems to pre date the wheel and model numbers as there is nothing on it! (Other that Honeywell)
(It’s a gold coloured rectangular box and is made in England – back when such things were made in the UK!!)
The new stat DT200 boosts “two wire install” with a 3rd connector quite obviously covered up. None of the wiring diagrams I’ve seem use this 3rd pole.
Does anyone have any ideas. Any help greatly appreciated.
I’m looking to replace an antiquated Honeywell mech. stat with a Honeywell DT200 (Digital).
I’ve discovered that the original has 4 wires, two red, two blue (2 two core cables). The two blue wires are connected to the same pole – no problem.
The reds, however, are connected to two different poles. There is also a pole on the stat that has no wires connected.
I suspect that one cable is connected to the boiler and the other to the pump (although I guess it could be the motorised valve!!??).
The heating system is pretty old and has only one such valve and no rad stat, trad boiler etc.
The original stat must be about 25 years old and seems to pre date the wheel and model numbers as there is nothing on it! (Other that Honeywell)
(It’s a gold coloured rectangular box and is made in England – back when such things were made in the UK!!)
The new stat DT200 boosts “two wire install” with a 3rd connector quite obviously covered up. None of the wiring diagrams I’ve seem use this 3rd pole.
Does anyone have any ideas. Any help greatly appreciated.
