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Evaporator freezing Art Todesco 07-10-2005
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Posted by Art Todesco on July 10, 2005, 5:10 pm


I have a question for you hvac guys.
Can a central AC A coil ice up from
reduced air flow in the condenser
(40-50% of the condenser matted up)? I
know this can happen from low airflow in
the evaporator. And I know it can
happen when the freon is low. If yes,
can you explain what happens to
pressures when it happens? Thanks,


Posted by Stretch on July 10, 2005, 1:08 pm


No.

With a restricted condensor coil, head pressure will go up, cooling
capacity and efficiency will go down, but the indoor coil will not
freeze from that. If your indoor coil freezes, there is another
problem.


Stretch



Posted by hvactech2 on July 10, 2005, 5:37 pm


wrote:

>I have a question for you hvac guys.
>Can a central AC A coil ice up from
>reduced air flow in the condenser
>(40-50% of the condenser matted up)? I
>know this can happen from low airflow in
>the evaporator. And I know it can
>happen when the freon is low. If yes,
>can you explain what happens to
>pressures when it happens? Thanks,

A partially plugged condenser will not cause a freeze up


Posted by TURTLE on July 13, 2005, 10:06 am


> wrote:
>
>>I have a question for you hvac guys.
>>Can a central AC A coil ice up from
>>reduced air flow in the condenser
>>(40-50% of the condenser matted up)? I
>>know this can happen from low airflow in
>>the evaporator. And I know it can
>>happen when the freon is low. If yes,
>>can you explain what happens to
>>pressures when it happens? Thanks,
>
> A partially plugged condenser will not cause a freeze up

This is Turtle.

The third NO in a row !

TURTLE




Posted by RP on July 17, 2005, 1:04 am




Art Todesco wrote:

> I have a question for you hvac guys. Can a central AC A coil ice up from
> reduced air flow in the condenser (40-50% of the condenser matted up)?
> I know this can happen from low airflow in the evaporator. And I know
> it can happen when the freon is low. If yes, can you explain what
> happens to pressures when it happens? Thanks,

Typically no, but it can happen, especially on window shakers. I
suppose from the unanimity of the other responses that most techs would
automatically assume either a solid restriction in the cap tube or
filter, or a loss of charge as the cause. After having cleaned the thing
up and rechecked it, and it is suddenly flying right, they naturally
assume that the blockage has dislodged itself, problem solved. They
might want to reconsider. Cap tubes don't typically clear themselves
because soap and water met the outside of them :)

TXV's can also go into an excessive hunting mode causing evap icing.
Excessive flashgas doesn't help matters.

I've seen both more than once, it doesn't get anymore straightforward
than that. But it isn't exactly a common occurrence.

hvacrmedic






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