it provides the consistent gas flow regulation required for Modine unit heaters like the PD50

As an industry-standard replacement part

When diagnosing HVAC system failures

Durable Internals: Features a stainless steel stem and high-performance EPDM seals for extended valve life cycles

this specific model is wound for a 277V coil

Belimo TR24-SR Actuator R-410A it provides the consistent gasThe Belimo TR24 SR is a high precision, non spring return actuator designed for the modulating control of dampers in HVAC systems. Operating on a 24VAC DC power supply, this compact damper actuator utilizes a 2 to 10 VDC or 4 to 20 mA proportional control signal to provide accurate positioning and consistent torque performance. With a rated torque of 18 in lb (2 Nm), it is an ideal solution for small terminal units, VAV box controllers, and bypass