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Posted by JonG on May 24, 2008, 1:09 pm
Hi all-
I have a question concerning my old (1993)Trane 1400XL. As it's gotten
hotter out it seems to be running longer, and not blowing quite as cool as I
remember it being this time last year. It normally has a duct temp of 55-58,
but it will now rise up to 61-63 during the peak of the day (about 95
outside). Being I was in the trade eons ago,and still having some of my
equipment, I decided to hook my gauges to it and see where it was at. The
high side was around 225, the low around 80, and the superheat fell right in
the middle of the chart for the unit (10 degrees). Just as I went to remove
the gauges I heard a buzzing that sounded like a relay. The moment the
buzzing started the superheat reading fell to within 2 degrees which is
obviously outside the acceptable range. After a few minutes the buzzing
stops and the superheat reading goes back to normal. It seems to repeat this
cycle every 5-10 min day or night. My question is- is this normal for this
unit or may I have a problem?
PS- Before you guys hammer me for being a DIY'er, I have no intentions of
doing anything further myself. If this operation is not normal I will be
calling Trane out next week.
TIA,
Jon
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Posted by Noon-Air on May 24, 2008, 1:13 pm
> Hi all-
> I have a question concerning my old (1993)Trane 1400XL. As it's gotten
> hotter out it seems to be running longer, and not blowing quite as cool as
> I remember it being this time last year. It normally has a duct temp of
> 55-58, but it will now rise up to 61-63 during the peak of the day (about
> 95 outside). Being I was in the trade eons ago,and still having some of my
> equipment, I decided to hook my gauges to it and see where it was at. The
> high side was around 225, the low around 80, and the superheat fell right
> in the middle of the chart for the unit (10 degrees). Just as I went to
> remove the gauges I heard a buzzing that sounded like a relay. The moment
> the buzzing started the superheat reading fell to within 2 degrees which
> is obviously outside the acceptable range. After a few minutes the buzzing
> stops and the superheat reading goes back to normal. It seems to repeat
> this cycle every 5-10 min day or night. My question is- is this normal for
> this unit or may I have a problem?
> PS- Before you guys hammer me for being a DIY'er, I have no intentions of
> doing anything further myself. If this operation is not normal I will be
> calling Trane out next week.
Is it a TXV system??
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Posted by JonG on May 24, 2008, 1:37 pm
> Is it a TXV system??
Yes it is a TXV system.
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Posted by Steve on May 24, 2008, 1:40 pm
>> Is it a TXV system??
> Yes it is a TXV system.
Its probably undercharged.... look for 10 - 14 degrees SC... if thats the
case, then you have a leak somewhere.
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Posted by on May 24, 2008, 1:47 pm
>Hi all-
>I have a question concerning my old (1993)Trane 1400XL. As it's gotten
>hotter out it seems to be running longer, and not blowing quite as cool as I
>remember it being this time last year. It normally has a duct temp of 55-58,
>but it will now rise up to 61-63 during the peak of the day (about 95
>outside). Being I was in the trade eons ago,and still having some of my
>equipment, I decided to hook my gauges to it and see where it was at. The
>high side was around 225, the low around 80, and the superheat fell right in
>the middle of the chart for the unit (10 degrees). Just as I went to remove
>the gauges I heard a buzzing that sounded like a relay. The moment the
>buzzing started the superheat reading fell to within 2 degrees which is
>obviously outside the acceptable range. After a few minutes the buzzing
>stops and the superheat reading goes back to normal. It seems to repeat this
>cycle every 5-10 min day or night. My question is- is this normal for this
>unit or may I have a problem?
>PS- Before you guys hammer me for being a DIY'er, I have no intentions of
>doing anything further myself. If this operation is not normal I will be
>calling Trane out next week.
>TIA,
>Jon
Heat pump or AC only ?
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> I have a question concerning my old (1993)Trane 1400XL. As it's gotten
> hotter out it seems to be running longer, and not blowing quite as cool as
> I remember it being this time last year. It normally has a duct temp of
> 55-58, but it will now rise up to 61-63 during the peak of the day (about
> 95 outside). Being I was in the trade eons ago,and still having some of my
> equipment, I decided to hook my gauges to it and see where it was at. The
> high side was around 225, the low around 80, and the superheat fell right
> in the middle of the chart for the unit (10 degrees). Just as I went to
> remove the gauges I heard a buzzing that sounded like a relay. The moment
> the buzzing started the superheat reading fell to within 2 degrees which
> is obviously outside the acceptable range. After a few minutes the buzzing
> stops and the superheat reading goes back to normal. It seems to repeat
> this cycle every 5-10 min day or night. My question is- is this normal for
> this unit or may I have a problem?
> PS- Before you guys hammer me for being a DIY'er, I have no intentions of
> doing anything further myself. If this operation is not normal I will be
> calling Trane out next week.