The unit is designed for a 1/4" NPT pipe connection

This is a factory-assembled unit featuring an exposed pneumatic actuator

the Conbraco 17-402-01 is a pressure-only relief valve often used in systems where temperature is controlled by other safety limits

Is this control board compatible with all Heil HVAC units

Supports a broad operating range of 100°F to 200°F

Johnson Controls MP843C001F Actuator Els PW 17895 The unit is designed forThe Johnson Controls MP843C001F is a robust pneumatic valve actuator designed for the precise positioning of terminal units and small valves. Engineered with a 50 square inch effective diaphragm area, this unit operates across a 3 7 PSI spring range, providing reliable spring return stem up action upon loss of control pressure. The actuator features a 3 4 inch stroke and is equipped with a standard 1 4 inch OD barbed fitting for secure air connection.