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 > Water dripping from New AC

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dcason

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Posted: 04/12/20 08:01am Link  |  Quote  |  Print  |  Notify Moderator

Hubby installed it last fall. Dometic Air conditioner. We are in VERY humid florida but it is mainly happening when we turn off the AC...water dripped out of the on/off switch on the AC. It is not happening all the time but it does when we turn it off....any ideas?
Donna


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rrupert

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Posted: 04/12/20 08:23am Link  |  Quote  |  Print  |  Notify Moderator

It sounds like the fins are frosting up. People suggest running the fan on high speed and making sure the air filter is clean.


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dcason

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Posted: 04/12/20 08:53am Link  |  Quote  |  Print  |  Notify Moderator

He has removed the filter, cleaned it just now and we are trying it without to see what that does. It was not that dirty but maybe dirty enough....
Thank you for you reply.
Donna

alfredmay

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Posted: 04/12/20 09:49am Link  |  Quote  |  Print  |  Notify Moderator

Make sure all the AC vents are fully open. Check the AC fins for ice just before AC shut down. If there is ice try raising the thermostat temo a few degrees.


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Posted: 04/12/20 10:00am Link  |  Quote  |  Print  |  Notify Moderator

Have him check that there is good separation between the output side of the AC and the return side while the cover Is off. If not a whole lot of cold air may be going directly up the return. Not good.

Is he sure the gasket is making a good seal between the AC unit and the roof?


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Old-Biscuit

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Posted: 04/12/20 10:15am Link  |  Quote  |  Print  |  Notify Moderator

Not raining so condensation is source of dripping

Could be Evap Coil Fins icing up then thawing
Which could be from dirty filter/dirty fins ---- A/C fan on Low speed
*Clean Evap Coil Fins, change air filter frequently, make sure fan is in AUTO

Could be Evap Coil drip tray drain holes obstructed
Which could be from crud/mold partially plugging drain holes
Which could be from overtightening the hold down bolts, crushing roof gasket & A/C Pan is now too close to RV Roof obstructing the drip pain drains
*Access Evap Coil Drip Pan drain holes under roof shrouds (Main cover and evap coil section sealed cover) and clean them
**Check that roof gasket is not over-compressed (should be roughly 1/2" distance between A/C Pan and roof line -- replace gasket if crushed)

Could be Evap Drip Pan drain holes are just too small to handle the High Humidity --- condensation is accumulating faster then drain holes can remove
While A/C is running the excess condensation is being sucked up by fan and blown into ducts --- then when fan stops a wave of condensation drips out
*When cleaning Evap Coil Drip Pan drain holes...enlarge them for higher flow thru them


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dcason

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Posted: 04/12/20 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

Not raining so condensation is source of dripping YES!

Could be Evap Coil Fins icing up then thawing NOPE
Which could be from dirty filter/dirty fins ---- A/C fan on Low speed
*Clean Evap Coil Fins, change air filter frequently, make sure fan is in AUTO

Could be Evap Coil drip tray drain holes obstructed MAYBE...he has yet to find them
Which could be from crud/mold partially plugging drain holes
Which could be from overtightening the hold down bolts, crushing roof gasket & A/C Pan is now too close to RV Roof obstructing the drip pain drains
*Access Evap Coil Drip Pan drain holes under roof shrouds (Main cover and evap coil section sealed cover) and clean them
**Check that roof gasket is not over-compressed (should be roughly 1/2" distance between A/C Pan and roof line -- replace gasket if crushed)

Could be Evap Drip Pan drain holes are just too small to handle the High Humidity --- condensation is accumulating faster then drain holes can remove THIS SOUNDS POSSIBLE.
While A/C is running the excess condensation is being sucked up by fan and blown into ducts --- then when fan stops a wave of condensation drips out
*When cleaning Evap Coil Drip Pan drain holes...enlarge them for higher flow thru them


We took the filter completely off and left it open. It is much better now without it on. He still needs to go up and find the drain holes to see what is up with that. Still a little water seeping out under the on dial over time but not the cascading water when we turned it off.
Thanks, old biscuit.
Donna

wolfe10

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Posted: 04/12/20 02:56pm Link  |  Quote  |  Print  |  Notify Moderator

If the unit has a freeze sensor, make sure it is correctly attached to the evaporator coils.


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wa8yxm

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Posted: 04/12/20 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

Two ideas. the FIRST is CLEAN the intake filters I have had that issue several times when I'm lazy about cleaning the intake filters and ONE time it was not so my first suggestion is CLEAN THE INTAKE filters. and I can tell you when the blower shuts off it is kind of "Niagra Falls" under the A/C. if that's the problem.. If you need to know why. ask.

Now the other problem.. For this you need to go up on the roof. Pull the shroud and do two things.> Clean everything (might as well since you are up there anyway This includes the condenser coils (On a Dometic I suspect the side that gets dirty is the fan side.. not easy to clean) inspect to see where the "Drip Lip" is (may be on one side or the other or the "Rear" (condenser) side of the A/C.

The one time it was not Dirty Filters the RV was not quite level. the drip lip on that unit was on the rear and I was nose down a couple inches. Lifting front fixed. but .. like that was one of several so I do not think that's it.

Icing of the fins can cause a slow drip drip that will go on for some time after you shut it off.. But not as likely to "Niagra Falls" type downpour.


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Old-Biscuit

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Posted: 04/12/20 05:51pm Link  |  Quote  |  Print  |  Notify Moderator

dcason wrote:

Old-Biscuit wrote:

Not raining so condensation is source of dripping YES!

Could be Evap Coil Fins icing up then thawing NOPE
Which could be from dirty filter/dirty fins ---- A/C fan on Low speed
*Clean Evap Coil Fins, change air filter frequently, make sure fan is in AUTO

Could be Evap Coil drip tray drain holes obstructed MAYBE...he has yet to find them
Which could be from crud/mold partially plugging drain holes
Which could be from overtightening the hold down bolts, crushing roof gasket & A/C Pan is now too close to RV Roof obstructing the drip pain drains
*Access Evap Coil Drip Pan drain holes under roof shrouds (Main cover and evap coil section sealed cover) and clean them
**Check that roof gasket is not over-compressed (should be roughly 1/2" distance between A/C Pan and roof line -- replace gasket if crushed)

Could be Evap Drip Pan drain holes are just too small to handle the High Humidity --- condensation is accumulating faster then drain holes can remove THIS SOUNDS POSSIBLE.
While A/C is running the excess condensation is being sucked up by fan and blown into ducts --- then when fan stops a wave of condensation drips out
*When cleaning Evap Coil Drip Pan drain holes...enlarge them for higher flow thru them


We took the filter completely off and left it open. It is much better now without it on. He still needs to go up and find the drain holes to see what is up with that. Still a little water seeping out under the on dial over time but not the cascading water when we turned it off.
Thanks, old biscuit.
Donna


Running W/O the filter is NOT the way to solve the issue.
W/O filter Evap Coil Fins will get dirtier/faster
Buy bag of filter material (ACE Hardware etc) and cut out replacements then FREQUENTLY change out --- wash/dry and reuse until they stretch out of shape.

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