How Do Electronic Thermostats Work In HVAC System?

What Is Electronic Thermostats and How Do They Work In HVAC System?

A communicating electronic thermostat in HVAC system is a device that can measure temperature and send out the result of the measurement; means a thermostat basically switches the heating system on and off accordingly. 

It detects by sensing the air temperature, switches on when the heating of air temperature falls below the thermostat setting, and switches off when the set temperature has reached.  


This is typically found in larger buildings as a means of regulating the central heating / cooling system, per room or per area.


By spinning a room thermostat to a higher setting which will not build the heat in the room. 


How speedily the room heats up depending on the design of a heating system. For example, the size of a boiler and radiators. 


Rotating a room thermostat to a lower setting will result, the room can controlled at a lower temperature and saves energy. 


The heating system doesn’t work if the time switch or programmer switch is off.
Move the mouse over a button inside the tabbed menu:

1: ELECTRONIC THERMOSTAT: T901

The T901 series proportional thermostats are microcomputer based, proportional and integral (PI) devices with one contact time proportioning output. They can be used with most relays and actuators that are compatible with on/off control signals. The thermostats also contain two dip switch to adjust the parameters :

Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T901 Series applications guide from the link below:

2: ELECTRONIC THERMOSTAT: T920

The T920 series thermostats are microcomputer-based, proportional and integral (PI) devices with one analog 0 to 10 Vdc output. They can be used with most controlled devices in the HVAC industry that are compatible with this signal. A typical application would be to control an analog VAV or valve actuator. The thermostats also contain three dip switch to adjust the parameters :

Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T920 Series applications guide from the link below:

3: ELECTRONIC THERMOSTAT: T921

The T921 series thermostats are microcomputer-based, proportional and integral (PI) devices with one analog 0 to 10 Vdc output & one contact output. They can be used with most controlled devices in the HVAC industry that are compatible with those signals A typical applications would be to control an analog actuator on a VAV box with an electric duct heater reheat stage. The thermostats also contain four dip switch to adjust the parameters :


Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T921 Series applications guide from the link below:

4: ELECTRONIC THERMOSTAT: T926

The T926 series thermostats are microcomputer-based, proportional and integral (PI) devices with two analog 0 to 10 Vdc outputs. They can be used with most controlled devices in the HVAC industry that are compatible with those signals. A typical applications would be to control an analog actuator on a VAV box with an electric duct heater with an SCR power control. The thermostats also contain 4 dip switch which adjust the parameters :


Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T926 Series applications guide from the link below:

5: ELECTRONIC THERMOSTAT: T950

The T950 series thermostats are microcomputer-based, proportional and integral (PI) devices with one floating (incremental) output. It can be used with most controlled devices in the HVAC industry that are compatible with this signal. A typical applications would be to control a floating VAV or valve actuator. The thermostats also contain three dip switch adjust the parameters :

Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T950 Series applications guide from the link below:

6: ELECTRONIC THERMOSTAT: T951

The T951 series thermostats are microcomputer-based, proportional and integral (PI) devices with one floating (incremental) output & one contact output. It can be used with most controlled devices in the HVAC industry that are compatible with those signals. A typical application would be to control a floating actuator on a VAV box with an electric duct heater reheat stage. The thermostats also contain five dip switch to adjust the parameters :


Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T951 Series applications guide from the link below:

7: ELECTRONIC THERMOSTAT: T900

The Unistat series offers exceptional value and versatility in most room and supply temperature control applications. By combining advanced PI control algorithms with microprocessor based electronics, it is possible to provide precise temperature control that rivals DDC performance at prices most often associated with electro-mechanical or pneumatic controls.


Download the full winiring Schematic Diagram for ELECTRONIC THERMOSTAT: T900 Series applications guide from the link below:
































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