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Posted by on September 3, 2007, 10:28 pm
> I got a 2nd opinion and found out there was no filter drier in the air
> handler and I'm told that really screwed the system. Could this be
> true? Full details below.
Could be, be many systems out in the field have no filter/drier and they
operate just fine.
I'm not agreeing that one shouldn't be installed, but not having one isn't
the root cause of your problems.
> -I spoke with the owner of the company that installed and has been
> servicing the unit. He says one of his techs felt the TXV valve was
> bad but they worked with Bryant over the phone who said the reversing
> valve was bad based on the data given. He said it would be close to
> $1000 to replace both and I should call Bryant and bitch to see what
> they'd do since the unit is only 14 months old.
Call Bryant????? Why?????
The parts are still under the 5 yr manufacture's warranty!
If the installing HVAC company won't work with you on the installation of
the warranted parts (on a 14 month old system), they'd never get another
dime from me!
Most competent, honest contractors would be happy to work with you, as
problems like this is very unusual and don't happen all that often. If it
does, they need training!
> -I called a new hvac company for a 2nd opininon. They sent a tech
> out. He measured the refrigerant psi for the lines attached to the
> condenser. He noted the pressure was climbing from 200 to almost 400
> psi, at which point the release valve kicked in and it would soon
> start all over again. He had eventually gotten the pressure stable
> and said he believed there was contamination in the line and the issue
> was now fixed (although I found no change later on). This is the info
> he gave me on what he did:
There was contamination, yet he didn't charge the unit with new refrigerant?
I smell more incompetence and bullshit!
> -found system overcharged
> -found system heat pressure raising to 450psi from 210
> -pumped system down, inspected piston at liquid line at condenser &
> screen at condenser. Found a small chunk of possibly brazing rod
> -flushed nitrogen through lineset to make sure there was good flow
> -pulled system into deep vacuum
> -recovered some of refrigerant to proper charge
> -system working properly
> -suction & liquid pressure steady
> - 10 degree superheat LO 80
> -12 degree subcooling Hi 200
> -18 degree delta T - compressor amps 10.1
Means little without complete details.
AT
CT
IWB
RLA
> I called the company back and they sent out another guy. He energized/
> de-energized the reversing valve using heat and cooling but it did not
> help.
Wow, another genius...
> He had been looking at the air handler and says there's no filter
> drier installed and now the system needs to be cleaned out, txv
> replaced, filter drier installed and we mostly likely don't have a
> filter drier on our other system (although that one's been functioning
> ok).
Which proves my point of it's not really required for proper operation.
However, it's there for protection!
> I looked at the documentation for this unit and the filter drier is
> listed under optional equipment but another page says it is suggested
> in all field-connected split-system heat pumps. Can the absence of
> this filter really cause the issue? If so, is this a major mis-step
> of the installers to not put it in?
Cause the issue, No.
Should it be installed, Yes.
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