Johnson Controls WEL17A-600R Well Assm 321894-708 This high-reliability low voltage bypass

This high-reliability low voltage bypass switch allows service technicians or property owners to manually override the set points of an outdoor thermostat (OT)

We recommend replacing the internal check valve rubber if the device fails its annual backflow test or if you observe constant dripping from the relief valve vent

Operating on a 24V 50Hz power supply

and specific NH3 adapters

the MT50-3VI features a large internal free volume that provides superior resilience against liquid slugging

Johnson Controls WEL17A-600R Well Assm 321894-708 This high-reliability low voltage bypassJohnson Controls WEL17A 600R 3 4" Well Assm 1 2"ID 10 7 16"