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Problem with AC comressor fast cycling

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Problem with AC comressor fast cycling Hareti 02-21-2007
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Posted by on February 22, 2007, 6:27 pm

> wrote:
>
> >> You apparently attracted a sizeable contingent of the alt.hvac
> >> assholes quickly. Lucky you. You did do the right thing. I
> >> understand you were just trying to get a better understanding of what
> >> might be wrong.he language barrier is a bit of a problem for me
> >
> >Thanks James. The LPCO is working on it right now.
>
> For once and for all - I was FUCKING MAKING IT UP about an
> LPCO being a person !!!!! Geez ......
>
> > Once it's fixed
> >I'll post the results and maybe we'll all learn something. The
>
> Don't bother. The rest of us already know the answer.
>
>
> >language barrier is a bit of a problem for me right now since i'm in a
> >foreign country and th LPCO doesn't speak english so you'll have to
> >bear with me.
> >
> >I'd still like to know more about chiller control. As I understand it,
> >the thermostat controls a solenoid valve on the suction side of the
> >compressor. When this opens the suction side pressure rises and and
> >the low pressure cut out starts the compressor. Is this correct?
>
> No, but don't fret your little head over it.
>
>
> >So why is there this two stage control? Why not just let the
> >thermostat control the compressor directly? The expansion valve is
> >also thermostatically controlled and there is a high pressure cut out.
> >What is the purpose of using a solenoid valve on the suction side?
> >
> >Thanks, Hareti
> >
> >P.S. I've decided that for the rest of this thread LPCO will refer to
> >a Licensed Professional Contractor Obviously, as Steve suggested.
>
> ARRRGGGHHHH !!!!!
>
> That was ME that said that AND I WAS FUCKING JOKING !!!!!
>
> God you're dense .....

Like a block wall... geez....




Posted by DIDO on February 22, 2007, 5:25 pm
Hareti: what gas(refrigerant ) does your chiller uses
at what temperature does chiller suppose to operate
yes there is possibility that unit is cycling on/off
on pressure switch the problem is what could be causing it
to do that, your contractor should check following
compressors vale plates perhaps some valve reeds
could be cracked and pressure equalizing very rapid,
liquid line solenoid valve stuck in open position,
if unit is shouting down on high pressure and you are
saying that it has plenty of cooling "not necessarily"
check the water if is picking up heat you could have
dirty condenser and it need to be clean out



>> You apparently attracted a sizeable contingent of the alt.hvac
>> assholes quickly. Lucky you. You did do the right thing. I
>> understand you were just trying to get a better understanding of what
>> might be wrong.he language barrier is a bit of a problem for me
>
> Thanks James. The LPCO is working on it right now. Once it's fixed
> I'll post the results and maybe we'll all learn something. The
> language barrier is a bit of a problem for me right now since i'm in a
> foreign country and th LPCO doesn't speak english so you'll have to
> bear with me.
>
> I'd still like to know more about chiller control. As I understand it,
> the thermostat controls a solenoid valve on the suction side of the
> compressor. When this opens the suction side pressure rises and and
> the low pressure cut out starts the compressor. Is this correct?
>
> So why is there this two stage control? Why not just let the
> thermostat control the compressor directly? The expansion valve is
> also thermostatically controlled and there is a high pressure cut out.
> What is the purpose of using a solenoid valve on the suction side?
>
> Thanks, Hareti
>
> P.S. I've decided that for the rest of this thread LPCO will refer to
> a Licensed Professional Contractor Obviously, as Steve suggested.
>
>



Posted by Hareti on February 22, 2007, 8:14 pm
Thanks DIDO and ftwht for your input. Things are a lot clearer now.
The chiller uses R22 and works at 3-5 degrees C.

It's definitely not cutting out on high pressure because this has to
be reset manually.

I had a look again and the solenoid is indeed in the liquid line. So
does the solenoid valve make control of the chilling more positive? I
was thinking that if you controlled the chiller purely by starting and
stopping the compressor there would be a delay and waste of energy.
Without a valve, when the compressor stops the liquid would continue
passing through the expansion valve for a little while. Then when the
compressor starts again it would have to charge all the lines between
the compressor and expansion valve before actual chilling starts.
Using a solenoid valve stops the movement of refrigerant completely,
and allows chilling to start immediately the thermostat demands it.

The LPCO has gone home, back tomorrow to finish the job.


Posted by on February 22, 2007, 9:49 pm
wrote:

>Thanks DIDO and ftwht for your input. Things are a lot clearer now.
>The chiller uses R22 and works at 3-5 degrees C.
>
>It's definitely not cutting out on high pressure because this has to
>be reset manually.

        Manual reset HP cutout is VERY VERY common.


>The LPCO has gone home, back tomorrow to finish the job.

        Probably got tired of listening to your ass.


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Posted by Stormin Mormon on February 24, 2007, 9:29 pm
I suspect that the unit has a receiver. And that the compressor
runs until the suction side gets low enough. Figuring that the
solenoid is on the liquid refrigerant line, that would make sense
that the solenoid opens when the chilled water gets too warm.

As you say, the solenoid allows more instant action. The cooling
water warms up, the solenoid opens, and the cooling starts almost
immediately.

Please let us know what the repair guy finds.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

: Thanks DIDO and ftwht for your input. Things are a lot clearer
now.
: The chiller uses R22 and works at 3-5 degrees C.
:
: It's definitely not cutting out on high pressure because this
has to
: be reset manually.
:
: I had a look again and the solenoid is indeed in the liquid
line. So
: does the solenoid valve make control of the chilling more
positive? I
: was thinking that if you controlled the chiller purely by
starting and
: stopping the compressor there would be a delay and waste of
energy.
: Without a valve, when the compressor stops the liquid would
continue
: passing through the expansion valve for a little while. Then
when the
: compressor starts again it would have to charge all the lines
between
: the compressor and expansion valve before actual chilling
starts.
: Using a solenoid valve stops the movement of refrigerant
completely,
: and allows chilling to start immediately the thermostat demands
it.
:
: The LPCO has gone home, back tomorrow to finish the job.
:



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