Installed within the system of heating and cooling units, an hvac pressure switch is a safety device. It monitors continuously the internal pressure of the system particularly the combustion area. The HVAC pressure switch opens and shuts off the operation of the HVAC system when it encounters certain conditions that may cause harm to the system. Commonly, the switches are tripped by clogged vents, dirty filters or dirty coils.
An HVAC pressure switch can either be manual or automatic. Similar to a light switch, a manual pressure switch needs to be physically flipped on and off by the homeowner. While, an automatic pressure switch immediately resets when it senses that the pressure is too high or too low. Without the support of homeowners, it directly turns off the system if the pressure is not stabilized, and keeps on recycling until the right pressure is reached.
Generally, pressure switches are categorized into two: hydraulic pressure switch and pneumatic pressure switch. For HVAC system application, pneumatic pressure switches are normally used. Production of these pressure switches are in respect to their HVAC units, and are mostly made by the same manufacturers.
HVAC Pressure Switch Replacement
Before anything else, make sure all the electrical power to the HVAC system is turned off. Remove first the compartment door and then, unhook the wires that connect to the pressure switch terminals. Next, remove the hose that joins the pressure switch to the pressure tap. Lastly, unscrew the pressure switch from the blower partition of the system. When attaching the HVAC pressure switch, simply perform the process in reverse.
For proper replacement, employ an HVAC contractor for the task. HVAC contractors can also carry out services such as cleaning, repair and installation of your HVAC pressure switch and other HVAC system parts.