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Subject Author Date
evaporator ice formation Vic Dura 06-29-2005
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Posted by Vic Dura on June 29, 2005, 8:02 am
Somebody mentioned several days ago that ice formation on an a
refrigeration evaporator can be caused by low freon (or perhaps air in
the system, I don't recall which). I've been wondering about that for
the past few days. Why would low freon or air in the system cause ice
formation? I'm just curious as to what the theory behind that is.

--
To reply to me directly, remove the CLUTTER from my email address.

Posted by Travis Jordan on June 29, 2005, 8:49 am
Vic Dura wrote:
> I'm just curious as to what the theory behind that is.

When the refrigerant charge is low the evaporator coil gets starved for
refrigerant and this results in reduced pressure at the inlet piston or
expansion valve, thus allowing the refrigerant to vaporize at a lower
temperature - below 32 degrees. At this point the first part of the
coil will freeze. Then, since ice is a fairly good insulator the
refrigerant will now travel further through the coil before encountering
an exposed surface. More ice forms and the process continues. Gradually
most or all of the evaporator coil will be covered with ice. This of
course blocks air flow through the coil.



Posted by Speedy Jim on June 29, 2005, 9:40 am
Travis Jordan wrote:
> Vic Dura wrote:
>
>>I'm just curious as to what the theory behind that is.
>
>
> When the refrigerant charge is low the evaporator coil gets starved for
> refrigerant and this results in reduced pressure at the inlet piston or
> expansion valve, thus allowing the refrigerant to vaporize at a lower
> temperature - below 32 degrees. At this point the first part of the
> coil will freeze. Then, since ice is a fairly good insulator the
> refrigerant will now travel further through the coil before encountering
> an exposed surface. More ice forms and the process continues. Gradually
> most or all of the evaporator coil will be covered with ice. This of
> course blocks air flow through the coil.
>
>
What a concise, helpful answer.
Thank you.

Jim

Posted by Vic Dura on June 29, 2005, 3:11 pm
On Wed, 29 Jun 2005 12:49:15 GMT, in alt.home.repair RE: Re:

>Vic Dura wrote:
>> I'm just curious as to what the theory behind that is.
>
>When the refrigerant charge is low the evaporator coil gets starved for
>refrigerant and this results in reduced pressure at the inlet piston or
>expansion valve, thus allowing the refrigerant to vaporize at a lower
>temperature - below 32 degrees. At this point the first part of the
>coil will freeze.

Ok, that makes perfect sense to me. Thanks for the clear explanation.

--
To reply to me directly, remove the CLUTTER from my email address.

Posted by Richard J Kinch on June 29, 2005, 2:19 pm
Vic Dura writes:

> Why would low freon or air in the system cause ice formation?

It does seem paradoxical, but it is true:

http://groups-beta.google.com/group/alt.home.repair/msg/0420eda678cc180f

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