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Topic: A/C Drips Condensation (Read 317 times) previous topic - next topic

A/C Drips Condensation

Our front A/C unit drips condensation from the vent just behind the filter.  Our system is ducted.  The unit cools well and has been serviced by myself and then by two RV service techs.  Drain pan and line appear clean and unrestricted.  We only see the condensation just after the unit shuts off, not during the time the fan is running.  The quantity of water that leaks when the fan shuts off makes me think the drain pan is full and the fan is keeping the water blown back and when the fan stops, the water overflows.  Pan appears level and installed properly. 
Any suggestions or advice, things to try?
Thanks!
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4

Re: A/C Drips Condensation

Reply #1 –
After further investigation, I do not believe the water is coming from the evaporator coil.  Pulled outside cover off and there is evidence of moisture below where the fan shaft enters the evaporator side plenum.  Cannot tell if moisture originated outside the plenum or from the inside.  Will try and find that out.
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4

Re: A/C Drips Condensation

Reply #2 –
Bill,

We had the "water drip" from our old Dometic DuoTherm Penguin units (now retired).  I posted a couple long-winded posts about how I solved our problem.  Link below.  If you have a different model roof unit, then my solution may or may not be applicable.

Penguin A/C Water Drip Fix

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: A/C Drips Condensation

Reply #3 –
Thanks Chuck.  Pictures are worth a thousand words.  I believe I have located the leak location.  I have ordered a new shroud and when it comes in I will also take some pictures of the area I believe is the problem and the fix.  Still haven't nailed down exactly where the water is coming from.  It is not dripping near the evaporator coil.  Will keep posted on progress.
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4

Re: A/C Drips Condensation

Reply #4 –
I have found that if you have the fan not shut off when the thermostat shuts off the compressor that you will not have the drip.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins
 

Re: A/C Drips Condensation

Reply #5 –
What I found.  Very small cracks in top of shroud could have been letting a small amount of water into the condenser compartment where it pooled against the wall that separates the condenser and evaporator coils, where it leaked through into the return air area.  I found where the seal between the two was compromised and dripping water.  Pretty much every morning, we have a thick layer of dew on anything and everything that could seep through the shroud.  Maybe the source of the water, maybe not.  I sealed the area between the two compartments, put on a new shroud and installed fresh foam that seals between the shroud and condenser coils.  It has not dripped water sense.  It is very humid here and rained all day yesterday so maybe problem solved.  Thanks for all your responses. 
Bill and Joyce, The House2 and Dashboard Pig III
2000 U320 4210 CAI (The House2)
Build # 5733
2019 F150 King Ranch FX4