Air flow switch protects preheater from overheating
Dangerous overheating would occur in this gas-fueled air preheater if the blower fails or the air flow is obstructed. To protect against this condition, a Model 530 air flow switch wired to the gas supply solenoid valve will close the valve if the air flow fails. A normally closed solenoid valve is specified to provide for fail-safe operation of this protective system. Where hazardous ambient conditions exist, a Series V4 Flotect® explosion proof flow switch can also be used.