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Author Topic: Heat Pump Dripping  (Read 392 times)

Jerry Emert

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Heat Pump Dripping
« on: October 09, 2019, 01:28:43 PM »
The heat pump has been dripping water inside over the last few nights.  Pulled the cover off the AC yesterday to check for junk in the pan and no clogs up there.  I do not think I have drains on the AC units.  They drain off the roof.  Replaced the rear AC a few months ago and couldn't find any drain lines there.  In the low 50s outside at night.  Ideas?  Thanks
Jerry, Chief USN Retired
2003 Patriot Thunder Lexington 40' 3 Slides
C-12 Ser#  2KS89983

Mike Shumack

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Re: Heat Pump Dripping
« Reply #1 on: October 09, 2019, 02:36:39 PM »
What is the humidity like in the coach?

Googling your problem - you're not alone. There are plenty of posts on this subject.
This is a common description of the heat pump operation:

There are two sets of coils in a heat pump, one is inside and one is outside. When in air conditioner mode, the heat pump pumps heat from inside to outside: the inside coil is cold (and has condensation on it) and the outside coil is hot. Many air conditioners provide a drain tube from this coil so no water drips inside the coach (mine just always drains onto the roof and drips all summer.)

When in heat mode, the cycle is reversed and it pumps heat from outside to inside. The outside coil gets cold and the inside coil gets hot. Now, any condensation is happening on the outside coil. This is a different drain pan than the one that collects the condensation when air conditioning. Either that pan doesn't have a drain tube, or it is plugged and the pan is overflowing.

That coil has outside air blowing over it and there is no filter. So dust and dirt can accumulate on it and then that dirt can be washed down by the condensate. So it doesn't take too much of a stretch of the imagination to say that a drain tube (if there is one) could get clogged.

So if you don't have a roof drain (and the drain opening from AC unit onto the roof is not clogged), the solution seems to be, to raise one end of the coach so the water runs off in a different direction.
Good luck
« Last Edit: October 09, 2019, 04:13:49 PM by Mike Shumack »
- Mike

'05 Beaver Patriot Thunder 525, Vicksburg, CAT C13, Allison 4000MH, HydraLift
Orlando, FL