On Sat, 04 Oct 2014 15:28:37 -0400, "Sir Gregory Hall, Esq."
wrote:

On Sat, 04 Oct 2014 07:34:51 +0700, wrote:

On Fri, 03 Oct 2014 10:38:12 -0400, "Sir Gregory Hall, Esq."
wrote:

On Fri, 03 Oct 2014 19:08:56 +0700, wrote:
On Thu, 02 Oct 2014 15:14:32 -0400, "Sir Gregory Hall, Esq."
wrote:

I can't figure it out. I keep having to let refrigerant out
of my Adler Barbour. It runs great with the suction-side
pressure set at 15 psi. But, every month or so it will
commence to cycle off and on after being off for the night.

I put a gauge on it and the suction side pressure is in the
beginning of the red range(55 psi). It turns on and the
compressor starts compressing, the pressure starts going
down but it only gets to about 45 psi until the compressor
*clicks off* and the voltage gauge goes up a volt or two
because the load comes off the circuit.

Then it turns itself off and back on and the compressor
starts to compress again and the pressure goes down to about
45 psi, then it cycles off again.

So, I let out some pressure until it only starts out around
45 psi and it will finally keep compressing until it draws
down the suction side to about 15 psi where it stabilizes.

So where does the extra pressure come from. I've had to
let out ten pounds of pressure about half a dozen times
this summer. I can understand leaks but this is ridiculous!

You have a closed system connected to a compressor. One side to the
suction side and the other to the pressure side. Think why the suction
side would be at a higher pressure, or conversely, why the low
pressure side is at a lower pressure in a properly operating system.

Since the two sides are able to equalize when the compressor
sits idle overnight the suction side and the compressed side
should be the same. So, when I measure the suction side at
startup and it shows 50 psi that means the compressed side
is also (temporarily) at 50. As the suction side pressure
decreases the compressed side increases.

So, if I measured pressure on the suction side in Jult after
it has sat idle all night it and it starts out being 30psi,
do tell why in August it will suddenly be reading 50psi on
the same suction side at start up?

As I said, it IS a closed system. If the system has been off for a
sufficient period the entire system should be the same pressure as the
refrigerant will be the same temperature throughout the system.

Then you start the system and the compressor sucks on one side and
blows on the other as it is a closed system why aren't the two sides
of the system still at the same pressure?

I fear you may suffer from reading comprehension problems, Bruce.

I understand what you just typed and the problem has nothing to
do with a system that's running and everything to do with a
system that has been turned off for the night.

In the morning, before starting, when the system is stabilized
so that suction side pressure equals compression side pressure
This is what I read on the suction side (i.e. it will be the
same on the compressed side).

July 38 psi
August 45 psi (so I let out five psi)
Sept. 60 psi (so I the let out 20 psi)

In other words, even though I let out pressure because
it gets so high that the compressor, when started for
the first time in the morning, cycles off and on because
of the high pressure cut-out circuit. That's why I have
to let out pressure so it will get about the business
of refrigerating.

So where does the excess pressure come from? And, don't
say water vapor as there will be no steam even if there
is water vapor when the system is cool and stabilized
in the morning.

I've been trying to get you to reason rather then just bitch and moan.
Think about why a totally closed system might have a significantly
different pressure for the suction and pressure sides of a compressor
when running and the same pressure on each side when the system is
shut down for a while.

You seem to be saying that your stabilized system pressure is high....
Have you checked the temperature of the system -- usually OAT and
looked at a temperature - pressure table to be sure that it isn't a
temperature problem?
--
Cheers,

Bruce in Bangkok