Enclosure thermostats are small models specifically designed for use in specialist electronic and IT settings, including control cabinets.
Modern processors and circuitry can generate a lot of heat. Enclosure thermostats are primarily focused on cooling, helping to regulate these environments and maintain safe temperatures, preventing the build-up of excessive heat, humidity and condensation.
There are four varieties:
- Small - ideal for electronic devices with very limited space
- Mechanical - these are focused on controlling air temperature in control cabinets and enclosures
- Dual - these combine two thermostats in one for heating and cooling control
- 24 VDC - these are focused on diverting 24-Volt electrical loads
Mechanical and Bimetallic Thermostats
Mechanical thermostats typically contain levers made of two metals laminated together. These expand in response to temperature change at different rates. The end of the lever will touch a fixed contact point when the temperature falls, triggering the activation of the heating system. When the temperature rises again, the lever moves away from the contact point, shutting off the heater.
Thanks to that internal lever, these wired models are also known as bimetallic or bimetal thermostats. Mechanical thermostats are less precise than electronic and smart models which deploy sensors. They cannot normally be set to a precise preferred temperature. Instead, the user specifies a range. A particular room might be a few degrees above or below the ideal temperature.
They may no longer be cutting edge tech, but bimetallic or mechanical models still have a place. They are inexpensive and ideal for those who want a very simple, on-off device - in an HVAC system or control panel, for example. They are also a good choice in environments prone to power surges such as buildings that are directly connected to generators. Electronic models, by contrast, can be seriously damaged by power surges.
KSD or KSD 301 thermostats are miniature bimetallic thermostats used in boilers, electric resistors, and heat exchangers.
Hysteresis thermostats are a specialist type designed to create a lag between environmental inputs and the response generated by an HVAC system. This is useful in certain climates and at particular times of the year, especially if both air conditioning and heating systems are connected to the same system.