P
Peter Martinez
New to the forum:
I have an oil-fired central heating system with one thermostat in the house which controls the boiler and pump. I have tried fitting TRVs to some of the radiators but they "fight" the main thermostat - the TRVs could all be off with the boiler/pump still running. I wish to replace the TRVs with electrically-operated valves, each with a separate thermostat in the same room. Ideally auxiliary switches on the valves will be wired so that the pump/boiler runs if ANY room is cold but shuts down if all rooms are warm.
I say "electrically operated" because I am not sure what is the right name for these things. "Thermostatic radiator valve", or "motorised radiator valve", but they don't seem to have motors in them, just a wax cylinder like in a TRV, but with a heater as well.
The Honeywell MT-4 device seems suitable. I think I can just replace the TRVs with these, but I am not sure which type I need. The cylinder in the present TRVs expands when hot, pressing a button on the radiator fitting to turn it OFF. I want the replacement to turn the radiator ON when I apply 230v to it's heater.
Question: Does this mean I need a NC (normally closed) type of valve (such as the Honeywell MT4-230S-NC)?
Another question: I need the auxiliary switch to be ON when the radiator is ON, i.e. when the valve is OPEN. My electrical training tells me that's a "normally open" switch so you can see why I am confused. Does the auxiliary switch come ON three minutes after 230v is applied to the device?
Any other advice would be most welcome.
Peter
I have an oil-fired central heating system with one thermostat in the house which controls the boiler and pump. I have tried fitting TRVs to some of the radiators but they "fight" the main thermostat - the TRVs could all be off with the boiler/pump still running. I wish to replace the TRVs with electrically-operated valves, each with a separate thermostat in the same room. Ideally auxiliary switches on the valves will be wired so that the pump/boiler runs if ANY room is cold but shuts down if all rooms are warm.
I say "electrically operated" because I am not sure what is the right name for these things. "Thermostatic radiator valve", or "motorised radiator valve", but they don't seem to have motors in them, just a wax cylinder like in a TRV, but with a heater as well.
The Honeywell MT-4 device seems suitable. I think I can just replace the TRVs with these, but I am not sure which type I need. The cylinder in the present TRVs expands when hot, pressing a button on the radiator fitting to turn it OFF. I want the replacement to turn the radiator ON when I apply 230v to it's heater.
Question: Does this mean I need a NC (normally closed) type of valve (such as the Honeywell MT4-230S-NC)?
Another question: I need the auxiliary switch to be ON when the radiator is ON, i.e. when the valve is OPEN. My electrical training tells me that's a "normally open" switch so you can see why I am confused. Does the auxiliary switch come ON three minutes after 230v is applied to the device?
Any other advice would be most welcome.
Peter