View Full Version : Defrost scheme

22-09-2009, 04:34 PM
Can anybody tell me what is the best method (least cost and most reliable!!) to defrost a water-to-air source heat pump? Thae heat pump is packaged and not split.

I know of one way to use a reversing valve; heat the frosted air coil (make it condenser) and then switch back to heating mode once the ice is melted.

Is there any other way (not electrical defrost) ?

22-09-2009, 11:27 PM
Err, no; not simpler.

mad fridgie
23-09-2009, 10:02 AM
Hot gas defrost, inject hot vapour after expansion device,

23-09-2009, 10:06 AM
Is that heat pump also used for cooling?