HydraMaster

Single pole, single throw rocker switch .

The MAC vacuum control solenoids work in conjunction with the temperature controller to operate the exhaust diverter actuator. When not functioning properly the actuator won't open and the unit will often under perform in heating. There are two solenoids employed one as a primary and one as a secondary, it's recommended to change both at the same time.

Hydramaster: Crossfire 4.4 235 switch.