Combi Boiler Room Thermostat Wiring

This guide shows you how to wire up a thermostat watch this and other related films here.

Combi boiler room thermostat wiring.

This is my video on how to wire a nest learning thermostat with a combi boiler it s super simple once you know the set up. A 2 wire thermostat is connected between line and the switched line terminal on the boiler. The thermostats can keep the room within less than one degree of the preset temperature. The choice will depend on the boiler.

This is the same switching arrangement however here a 3 wire thermostat is used which requires a neutral connection. Here are all the products i used. Also covers volt free contacts and why mains voltage must not be connected t. The boiler will have a terminal which activates the boiler when mains voltage is applied to it typically labelled sl or switched line.

The boiler only operates if both the programmer and thermostat are on. Here the neutral is shown from the boiler however it could be provided via the programmer if this is more convenient. The circulator pump for the central heating is normally an intergral part of the boiler so no additional wiring is required. These boilers require a mains voltage thermostat which can have 2 or 3 wires.

There are two main types 2 wire and 3 wire. A wireless thermostat is a digital device that can tell you the temperature of its surroundings. It does this using electronic sensors and can communicate with the boiler to provide the ideal room temperature for yourself. For those boilers which have a programmer or timer built in the only other device required is a room thermostat.