Refrigerant evaporator leaking

Posted by Christopher Finke on May 31, 2007, 9:38 pm

I have a Lennox central air system in my house (installed about 20
years ago), and just this season, puddles of water have started to
appear underneath the refrigerant evaporator. The strange thing is
that it appears that it only happens after the A/C shuts off, not
while it is running. We'll run it for hours with no water appearing,
but then we shut it off and overnight, a couple liters of water appear
around the base of the furnace and evaporator.

I checked the hose that drains the pan that the water collects in, and
it is clear. I tried pouring over a gallon of water straight into the
bottom of the evaporator, and it all drained just fine.

Any ideas as to what the problem could be? We're wondering if it
might be related to another problem we have - one of our outdoor
faucets will spray water out of it about 10 seconds after you turn it
off, kind of like the pressure is building up after the water stops
running. Is it possible that something similar is happening with the
water that is supplied to the A/C? What might cause it?

Chris

Posted by =?ISO-8859-1?Q?Tekkie=AE?= on May 31, 2007, 9:52 pm

Christopher Finke wrote:

> I have a Lennox central air system in my house (installed about 20
> years ago), and just this season, puddles of water have started to
> appear underneath the refrigerant evaporator. The strange thing is
> that it appears that it only happens after the A/C shuts off, not
> while it is running. We'll run it for hours with no water appearing,
> but then we shut it off and overnight, a couple liters of water appear
> around the base of the furnace and evaporator.
>
> I checked the hose that drains the pan that the water collects in, and
> it is clear. I tried pouring over a gallon of water straight into the
> bottom of the evaporator, and it all drained just fine.
>
> Any ideas as to what the problem could be? We're wondering if it
> might be related to another problem we have - one of our outdoor
> faucets will spray water out of it about 10 seconds after you turn it
> off, kind of like the pressure is building up after the water stops
> running. Is it possible that something similar is happening with the
> water that is supplied to the A/C? What might cause it?
>
> Chris
>

It's old - it's incontinent - let it
out...

Posted by Noon-Air on May 31, 2007, 9:55 pm

Sounds messy

> I checked the hose that drains the pan that the water collects in, and
> it is clear. I tried pouring over a gallon of water straight into the
> bottom of the evaporator, and it all drained just fine.

yup

> Any ideas as to what the problem could be? We're wondering if it
> might be related to another problem we have - one of our outdoor
> faucets will spray water out of it about 10 seconds after you turn it
> off, kind of like the pressure is building up after the water stops
> running. Is it possible that something similar is happening with the
> water that is supplied to the A/C? What might cause it?

Several things can cause it, first is not having it services regularly.

Posted by on May 31, 2007, 10:11 pm

wrote:

>>I have a Lennox central air system in my house (installed about 20
>> years ago), and just this season, puddles of water have started to
>> appear underneath the refrigerant evaporator. The strange thing is
>> that it appears that it only happens after the A/C shuts off, not
>> while it is running. We'll run it for hours with no water appearing,
>> but then we shut it off and overnight, a couple liters of water appear
>> around the base of the furnace and evaporator.

>Sounds messy

>> I checked the hose that drains the pan that the water collects in, and
>> it is clear. I tried pouring over a gallon of water straight into the

Hose ???

>> bottom of the evaporator, and it all drained just fine.

>yup

Tee hee :-) Is there some kind of trap in that answer ? Tee
hee :-)

>> Any ideas as to what the problem could be? We're wondering if it
>> might be related to another problem we have - one of our outdoor
>> faucets will spray water out of it about 10 seconds after you turn it
>> off, kind of like the pressure is building up after the water stops
>> running. Is it possible that something similar is happening with the
>> water that is supplied to the A/C? What might cause it?

>Several things can cause it, first is not having it services regularly.

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Posted by Christopher Finke on May 31, 2007, 9:56 pm

> The strange thing is that it only leaks after the A/C shuts off.

I've just confirmed this. When I shut off the A/C after it ran for
about 2 hours, a puddle of water immediately started coming out from
under the unit. It was also accompanied by a faint hissing sound,
kind of like tire slowly deflating. The hissing sound stopped at
about the same time the puddle stopped growing.

Chris

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