Description
The HTP 91498 Blocked Vent Pressure Limit Switch is a safety control module used to monitor venting conditions and detect blocked or restricted exhaust flow within combustion systems. It responds to changes in air pressure by sending a signal to the control circuit when proper venting conditions are not met. This component is commonly used in boilers, water heaters, and other HVAC systems where safe exhaust airflow is required for operation. Installed in the vent sensing line, it verifies draught conditions during system startup and normal running cycles.
