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Posted by Red Green on June 24, 2008, 9:24 pm
>> Art wrote:
>>> Just had a tech check out one of my 3 HVAC systems. When the house
>>> was built the contractor switched outside units between the upstairs
>>> and basement so upstairs was too hot. I had them switch out the
>>> obviously wrong sized outside units. I asked them if anything
>>> inside had to be switched out and they swore everything was ok
>>> inside.
>>>
>>> Upstairs never cooled well but we were never used upstairs much
>>> until now.
>>> So I had someone come out today and told him the story. He says the
>>> metering unit orifice (piston) is too small upstairs and needs to be
>>> replaced with bigger one at a cost of $193 for the part and $533. I
>>> just called another guy to come in for a second opinion but I was
>>> wondering if the estimate sounds reasonable if indeed this is the
>>> problem.
>>> Thanks in advance for assistance.
>>
>> I have a few questions:
>> 1. What is the size (Tonnage) of the upstairs and basement condensing
>> units?
>> 2. What is the size (Tonnage) of the upstairs and basement evaporator
>> coils?
>> 3. Was the bid to replace the piston only or to replace the total
>> metering device?
>>
>> --
>> Moe Jones
>> http://www.MoeJones.info
>>
>>
>>
>
> I got some answers. Both inside units are idenditcal 2 ton units.
> Basement outside unit is 1.5 tons. Upstairs outside unit is 2 tons.
> According to the tech that was here today, it was common when my house
> was built 10 years ago to use an oversized inside unit to squeeze more
> efficiency out of the system on the small tonage outside unit.
>
> He washed outside coils and checked freon on all 3 systems. Basement
> was slightly low. Upstairs was way low, taking about 3 pounds of
> freon. None of these systems have been checked for8 years because the
> guy I had come in to check them when the house was 2 years old did
> nothing so I pretty much gave up on HVAC contractors. Plus we hadn't
> been using the upstairs much until this summer.
>
> The technician today's philosophy is (and I am sure many will
> disagree) is the first time he adds freon to a system that hasn't been
> serviced for such a long time, he will not try chasing down the leak
> because he probably won't be able to find it unless it just started
> leaking. He says if it warms up again upstairs, he will chase down
> the leak but he suspects it is the inside coil and he says carrier
> charges so much for that inside coil that I might be better off
> replacing the outside unit too.
>
> Right now things are plenty cool in the house.
>
>
> he says carrier
> charges so much for that inside coil
There was an old Carrier on one house I had that had coil problems. HVAC
guy said the cost of just the coil alone was about the installed cost,
parts & labor, of another brand.
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