Zonefirst SPRD-9 Damper Els PW 17895 Perform a resistance test using

Perform a resistance test using a multimeter set to Ohms at room temperature

it can monitor the pressure drop across filters or coils

the upper thermostat has likely failed to energize the first element or its high-limit reset has tripped due to an overheat condition

Compatible with high-precision Danfoss AKVA expansion valves and EV series solenoid bodies

making it a staple for technicians performing HVAC preventative maintenance or emergency repairs

Zonefirst SPRD-9 Damper Els PW 17895 Perform a resistance test usingThe Zonefirst SPRD 9 is a professional grade 9 inch round barometric static pressure regulating damper engineered for precise HVAC bypass management in multi zone systems. This mechanical, non electrical component utilizes a weighted counter balance arm to automatically relieve excessive static pressure as individual zone dampers close. When the air pressure in the supply plenum exceeds your calibrated setpoint, the damper blade opens to bypass air