York S1-37323867001 1-Stage Defrost Module Control Kit YorkGuard VI

The York S1-37323867001 Yorkguard 1-Stage Defrost Module is an essential component of heat pump HVAC systems. In addition to being a defrost module, it controls the defrost cycle so that ice will not form on the outdoor coil during the heating operation when the weather is cold. This module also measures temperature and when the temperature is low, it turns the heat pump around to warm the outdoor coil to defrost it. This makes the heat transfer efficient and at the same time protects the unit from ice damage in case it builds up. The 1-stage means that the defrost control is basic, and it has only one position on or off.