Modine 3H20634-2 Gas Fired Unit Heater Primary Air ControlGas Fired Unit Heater Primary Air Control (Modine 3H20634 2) ensures precise air intake modulation for efficient combustion in your heating system. This replacement part is designed for use on PD30 PD50 PD75 PD100 gas fired unit heaters, delivering reliable performance across the Modine lineup. As a key component of many industrial heating systems and Modine gas heater components, this air control supports durable operation, easy maintenance, and

This 1 inch nominal valve uses a diaphragm actuator paired with a proportional normally open positioner to deliver precise

Compact Programmer Module designed for industrial burner installations

Pressure ratings: 2 PSI (liquid propane)

Cleveland DFS-221-112 Air Pressure Sensing Switch is a SPDT fixed point pressure switch engineered for dependable air control in compact pneumatic systems

Consistent pressure control for predictable burner response

Optimized for compatibility with AO Smith heating systems

Trust the AO Smith K

The thermostatic element maintains comfortable room temperatures by automatically adjusting flow

This 1/2 HP

Stroke: 1-1/2 in

and durable components that resist wear in tough environments

rated 24 to 277 VAC at up to 10 A