or a heater that fails to reach setpoints often points to a compromised 10k ohm thermistor or damaged sensor wiring

or grinding from the motor bearings also signal imminent failure

What makes this suitable for smoke control

Compressor Protection: The hard shutoff design prevents liquid refrigerant from entering the suction line during downtime

Key Benefits Direct Compatibility: Precision-engineered for McDonnell & Miller 150 and 158 Series bodies

Laars Heating Systems RE2033900 Module 318172-701 or a heater that failsThe Laars Heating Systems RE2033900 Module is a critical replacement 24V ignition control designed for precise burner management in high efficiency boiler and pool heater applications. Engineered with a 0 second pre purge (0sPP), an 8 second trial for ignition (8sTFI), and a single try ignition sequence, this intermittent pilot module ensures rapid flame establishment and efficient fuel combustion. This component is specifically matched for Laars AP