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07-31-2005, 03:55 AM
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#1
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Registered
Join Date: Oct 2000
Location: N.E.
Posts: 3,680
Sonic
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Air Conditioner question ???
I just installed air in my 35 Sonic. I'm having a problem where the aluminum fins on the retun side of the unit are freezing solid with ice after a couple hours of running.
Does anyone know what would cause this? a buddy of mine re-charged the unit to make shure it was good on freon. he also verified i had enough return flow getting to the unit.
any ideas??
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07-31-2005, 08:13 AM
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#2
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Registered
Join Date: Feb 2002
Location: Orlando
Posts: 1,954
just a filter
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Re: Air Conditioner question ???
could be a number of things....low charge , low airflow(restricted by something or dirty) , low return temp, or a combination of the above....after a few hours what is the temp of the cabin?
why did he check the charge?
Last edited by NASTY HABIT : 07-31-2005 at 08:15 AM.
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07-31-2005, 09:54 AM
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#3
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Rob
VIP Member
Join Date: Aug 2001
Location: Mississippi
Posts: 19,173
New shinny Peeroo
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Re: Air Conditioner question ???
Maybe a recycling switch. letting the the compressor not cut off making the condenser freeze up?
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07-31-2005, 10:25 AM
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#4
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Registered
Join Date: Oct 2000
Location: N.E.
Posts: 3,680
Sonic
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Re: Air Conditioner question ???
Quote:
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Originally Posted by NASTY HABIT
could be a number of things....low charge , low airflow(restricted by something or dirty) , low return temp, or a combination of the above....after a few hours what is the temp of the cabin?
why did he check the charge?
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last time i checked the digital thermostat before it froze, the temp was 77 (have it set for 73). The reason why we checked the charge was to rule out the low charge theory. And It was a bit low due to a small leak in a schrader valve. (this is a used unit). We put some pipe sealer around the cap and it seemed to hold. he left the gauges on there for 15 minutes and closed the hatch where it is mounted....and the pressure never dropped. So he said my return supply must be good or he would have seen a pressure drop after he closed the hatch.
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07-31-2005, 11:25 AM
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#5
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Registered
Join Date: Mar 2004
Location: Pasadena, MD
Posts: 26
'89 Sonic 42SS
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Re: Air Conditioner question ???
What kind of refrigerant is this system using and what were the pressures (both high and low side)?
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07-31-2005, 12:03 PM
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#6
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Registered
Join Date: Oct 2000
Location: N.E.
Posts: 3,680
Sonic
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Re: Air Conditioner question ???
the refrigerant is R22. I forget what the high side was, but the low side was 55 and he charged it up to 68. This is a 7k btu Marine Air unit.
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07-31-2005, 03:12 PM
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#7
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Platinum Member
 Platinum Member
Join Date: Oct 2000
Posts: 1,237
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Re: Air Conditioner question ???
Your talking like this is a split system.....or is it a package unit.
have any pics?
Last edited by enticer : 07-31-2005 at 03:27 PM.
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07-31-2005, 08:52 PM
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#8
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Registered
Join Date: Oct 2000
Location: N.E.
Posts: 3,680
Sonic
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Re: Air Conditioner question ???
Here is the website for the system.....
http://www.marineair.com/pdfs/vr.pdf
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08-01-2005, 09:28 AM
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#9
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Registered
Join Date: Jan 2001
Location: ST. Louis, MO, USA
Posts: 1,658
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Re: Air Conditioner question ???
Usually restricted air flow. Either clogged with dust/debris on the intake or kinked hose on the outlet. Also check to see if the fan is running at high speed.
Gary
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08-07-2005, 10:39 AM
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#10
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Registered
Join Date: Mar 2004
Location: Pasadena, MD
Posts: 26
'89 Sonic 42SS
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Re: Air Conditioner question ???
Sounds kind of odd to have the evaporator freeze up with a suction pressure of 68#. A 68# suction gives you a 40 degree evaporator coil. I can understand the 55# freezing up, that would be a 30 degree coil and moisture in the air would instantly freeze to the coil. Your suction pressure is dropping down below 58# for some reason. Are you sure that you do not have a refrigerant leak and you have lost some refrigerant again. How long does it run before it starts to freeze up. Does the cabin ever start to cool down?
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