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Hi i have a wireless room thermostat i wish to fit to my potterton boiler can anyone advise me thanks

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There is a standard layout and names given to the relay / circuit . depending on the complexity (heat plus a/c plus Hea-tPump) gives three different "Circuits". They are not too complicated but remember this is electricity and needs to be respected.

Start with Basic Circuit ; Heat only in winter - The power source (24 volts ac in north america for furnace) . this connects to two wires to thermostat in center of house (ususally inside wall). Transformer (24v) is ON all the time that the furnace primary circuit is engaged.

This gives 24 volts (AC) across the terminals of the thermostat, when it is OPEN. (not calling for heat).

When the temperature in the room goes below the set point (temperature you want it to be), then the circuit CLOSES and this power drives the relay inside the furnace. With the circuit open, a little warming circuit fools the thermostat for a while, called the "Anticipator" setting, and prevents the sudden 2 minutes on 2 minutes off cycling of the furnace, as the temperature approaches the set point.

Once the "Anticipator" has timed out (warmed up enough) the warm air of the room tells the thermostat to Open the circuit and stop delivering heat to the room.

As long as the room stays at the temperature that was set, the furnace will not turn on

For the color(colour) of wires they should be different, black red, white, yellow etc. The terminals on the furnace have letters that match the colours Y, W, R G etc. These are matched to the function that is done (Heat, Fan, A/C etc).

Since you mention "boiler" this implies you have a hydronic (Water based boiler system)

There are additional Thermostats attached to the pipes that are connected to the circulation pump and control the pump on / off cycles, and also protects the boiler of over heating (never want the temperature over 200F or 90C).

Now, you mention that this a WIRELESS thermostat.

OK, so the Remote (has the battery in it) sends a radio signal to the receiver. The Receiver gets the signal, then CLOSES the HEAT circuit and the FAN circuit for Forced Air Home systems on 24VAC.

The Furnace fires up, and starts to circulate the heat, the circulation pump turns on once the boiler gets warm (50C??) and starts to deliver the heat to the RADIATORS in the upper floors.

The radiators deliver the heat to the AIR, and then the thermostat senses how warm it is, and sends another Radio Signal to the Main module (where the wires are), and stops sending the energy to the HEAT and AIR signals

It gets a little more complicated for the SUMMER / Air-Conditioning Season, as the FAN turns on, but the HEAT circuit is OFF, while the A/C circuit is ON while the temperature is too hot, untiil the cooling has done what it is supposed to do.

When the cooling is finished, then the fan stops, and the compressor (Outside?) shuts off, and a minute later the fan stops as well.

Hope this helps
[It gets even more complicated with a heat pump, but that is a different animal)

Posted on Feb 16, 2015

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In general-
wireless thermo has 2 units - room thermo and furnace rcvr.
if thermo is battery powered no wires to connect - if not needs 24V connected - then why do they call it wireless?
rcvr connects to same 4 wires as current therm except at the furnace - 24v power and 2 control lines
I can't remember the color code except red/black is +24v/common
but I have found them messed up by "professional" installers so u need to verify before connecting or go by the terminal labeling.

Posted on Dec 09, 2014

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