Hi guys, I've been working on a large packaged heat pump unit and I noticed the supply air was between 15-20C which is too low.
The bottom of the evaporator was heavily iced.
On the evaporator is a defrost stat that was fitted by the original installers at a later date.
The defrost stat has a bulb that sits in-between the coil and switches the 4way rv when ever it senses the set temp.
However I'm unsure as to what it should be set at.
It was originally set at 0C but if I leave it at that setting then the unit constantly goes on defrost (every 5 mins or so)
Could this defrost method work without a timer or is there something I'm missing.