Connecting a thermostat to a gas boiler

The most modern and technologically advanced models of gas boilers are equipped with a thermostat. This device allows you to determine the temperature and humidity in the room, and, based on the measurement results, regulates the power of the boiler. When the temperature rises, the boiler power is turned off, and when the temperature is too low, it turns on. This function is especially beneficial in cases where a gas meter is installed - turning off the equipment allows you to reduce its consumption. In addition, the use of such devices allows you to maintain a comfortable microclimate in the room, preventing the air from overheating.

How to connect a thermostat to a gas boiler

If you have an old or simply too simple model of gas appliances, you may need to connect the thermostat yourself. This is not difficult to do, the main thing is to follow the instructions and check the documents for the gas boiler itself and the equipment connected to it.

Required tools and materials

One of the main advantages of connecting a thermostat to a gas boiler is that it does not require any special tools or special skills. Everything that is needed to install a thermostat on a gas boiler is part of the basic equipment set.You will need a technical passport of the gas boiler and documents for the thermostat to check the diagrams and make sure they are compatible. You will also need a regular screwdriver, a tester to determine the voltage in the electrical network, as well as tools for installing the device on a wall indoors. In some cases

Important! The complete set of tools depends on the equipment model and installation location. Whichever one you choose.

Important connection points

The most important point is choosing the sensor model you need. Thermostats come in three types: mechanical, electromechanical and electronic. The first two types are installed directly into the system and measure the temperature of the coolant. Older models of gas equipment can be equipped with such devices. Their installation is not only difficult, but also impractical. If you want to install a thermostat for your heating system, it is better to choose a modern electronic model. It connects to the boiler and determines the temperature not of the water in the system, but of the air in the heated rooms. The comfortable temperature in such devices can be set through the settings. If the set threshold is exceeded, the device gives a signal to the boiler and turns off its operation.

In order for the thermostat to measure the actual temperature and humidity in the room, you must adhere to the following rules when installing it:

• The installation height of the regulator should be slightly less than a person’s height, from one and a half meters to 1.7 meters.
• The device must be installed at a distance of at least a meter from heating devices and any equipment that heats up during operation, as well as from fans and air conditioners - all this will distort the readings of the device.
• The effect of drafts or ventilation on the regulator should be minimized.
• The sensor must be located in a heated room - otherwise its readings will be underestimated.

Important! If you have heated floors in your house, it is best to purchase a model of a temperature control device that has an additional temperature sensor installed near the floor. It detects the air temperature in the lower zone and provides more accurate readings.

Step-by-step instructions for connecting a thermostat to a gas boiler

Installing a thermostat on a gas boiler can be divided into two stages: installing the device itself on the wall in the room and connecting it to the heating boiler.

The device should be installed on a wall in accordance with the instructions supplied with it. When the thermostat is fixed at the required height, it is necessary to lay a wire from it to the boiler. When laying wires, you can use both open and closed methods. When connecting the control device to heating equipment, proceed in the following order:

• One end of the cable is connected to the regulator contacts marked NO and COM. On wireless models, the connection terminals can be found in the relay block.
• The marking and location of connection of the second end of the wires can be found in the instructions for the gas boiler.
• The connectors and gas control board can be accessed by removing or sliding the front panel.
• There may be a jumper between the terminals required for connection. It should be removed, but not thrown away.
• Connect the other end of the wire connected to the thermostat to the terminals.
• If the thermostat is wireless, a three-wire power cable with a ground loop must be connected to the second relay box.

Important! If the markings on the thermostat differ from the standard ones, you can find the necessary terminals using a tester. The circuit between the terminals you need must be open.

It is also important to remember that some heating equipment models do not work with thermostats. They have a gas valve installed that responds only to mechanical influences, so electrical adjustment of the operation of such a heating boiler is impossible. Most often, these are non-volatile models of gas equipment.