The orifice must be matched to the outdoor unit's capacity and manufacturer specifications to maintain balanced system pressures

EPDM is preferred for its superior heat and chemical resistance

facilitating safer diagnostic practices

Precision Balanced: Reduces stress on the motor shaft and bearings

Lennox 14W86 Defrost Thermostat 320788-704 The orifice must be matchedThe Lennox 14W86 Defrost Thermostat (MFR 100503 06) is a critical OEM replacement part engineered to maintain thermal efficiency in high performance heat pumps and refrigeration systems. This SPST sensing switch operates with a fixed 42F close and 70F open temperature differential, providing precision defrost cycle initiation to prevent harmful frost accumulation on the evaporator coils. Field tested for durability, the 14W86 features 60 inch lead