Installing wireless thermostat

[Perpetuelle]

Can anyone please give me an idiot's guide to installing a Honeywell CMT927 stat. My boiler is a Main Combi Eco with an electro mechanical timer. The boiler is three years old.

I have TRV's in all rooms except the bathroom and I have read differing comments re moving the thermostat from room to room depending on which room you're in or whether it should remain in one room and remove the TRV in that room or turn up to maximum setting. It's so confusing, what do others think - leave in one room or move around accordingly; remove TRV or turn up to max?

I'd appreciate any advice as I'm not savvy with electrics and will get someone more competent to do the work.

Many thanks in advance.

 

[Aragorn84]

The room containing the thermostat should have its TRV set to full, otherwise the stat cant do its job....

Personally i'd suggest putting it in your main living area where you spend most of the time, and use the TRV's on the other rads around the house to get the rest of the house comfortable.


In some cases, you may have to slightly shut back the radiator in the main living area, if you find that room reaches the setpoint and shuts off the boiler before the rest of the house is warm enough.


If you have multiple rooms occupied you might find it more effective to put it in a hallway and leave the TRV's to control the temperature in each room.

 

[ericmark]

Much depends on the software used in the boiler. Some boilers are quite clever and have anti-cycle software this tests the return water after set time and if it returns hot increases the time before if fires again and if it returns cold decreases the time.

This relies on "ALL" radiators having thermostatic valves and a spring loaded bypass valve so once all thermostatic valves are closed the water just returns to boiler hot which closes it down.

The software comes in many flavours and in some cases a thermostat placed so morning sun will warm it is used to stop the heating system firing up on what promises to be a warm summers day. The other use of a thermostat is to cool the house but not switch central heating completely off when out at work. There are thermostats now which instead of simple on/off change the trigger temperature at different times of the day.

What seems odd installers still fit central heating with one radiator without TRV even though the boiler is designed to have all radiators with thermostatic valves. So it becomes a problem working out what system is in place.

So I like for the word anti-cycle to work out is it should or should not have all TRV's.

 

[Perpetuelle]

The room containing the thermostat should have its TRV set to full, otherwise the stat cant do its job....

Personally i'd suggest putting it in your main living area where you spend most of the time, and use the TRV's on the other rads around the house to get the rest of the house comfortable.


In some cases, you may have to slightly shut back the radiator in the main living area, if you find that room reaches the setpoint and shuts off the boiler before the rest of the house is warm enough.


If you have multiple rooms occupied you might find it more effective to put it in a hallway and leave the TRV's to control the temperature in each room.