When you work on a heat pump system and you want to test defrost there are so many different test procedures to follow to test the board and.
2 ton Carrier 38YXA heat pump. Balance point set at 40*F Defrost thermostat closes contacts 30*F plus or minus 3*F Defrost thermostat opens.
Checking the Defrost Control Board HVAC Training - Defrost Control And connect a jumper across the defrost thermostat terminals on the control board.
A heat pump's outdoor unit will begin to frost and ice up somewhere aro. boards) the defrost board sends a signal to the defrost thermostat to test for icing.
In this HVAC Heat Pump Defrost Video I go over the pivotal role that the DFT Defrost Limit Sensor has in making sure that defrost cycle.
On heat pump units, when in the heating mode, the reversing valve defrost thermostat to be closed when the defrost board checks it, the board Field Testing.