On 4/22/2011 10:48 AM, firstname.lastname@example.org wrote:
You still missed it. I read her later answer about the temperature. I
know the time lines get messed up sometimes but I don't hold it against
you. I did look around a bit for a service manual online but I'm not
going to spend $10.00 to prove a point on Usenet. At first, I didn't
know the temperature outdoors until the OP answered me. So I was
operating on a faulty assumption about ambient temperature. This time of
year, the temperatures around the country can vary quite a bit. It
may hit 90° around here today but it was in the low 50's last week.
When the refrigerant charge is low in a unit of any kind, it's going to
behave erratically just like me. ^_^
Ok, I'm cool with that and we can go back to being friends :)
In the hopes of helping Jan, here's a schematic I found which
is apparently for the same model, but smaller.
Kind of hard to read, but if you try you can make out most of it.
The part on the right is fairly easy to follow. Any thoughts?
On 4/22/2011 12:07 PM, email@example.com wrote:
I see the pressure switch for the condenser fan and under a low charge
condition with a warm outdoor temp, the condenser fan may go on and off.
The way a low ambient control,(the pressure switch) the symbol that
looks like a little bell is hung under a slash labeled "LAC", works is
the pressure in the condenser drops when the fan runs during cold
weather which will cause the pressure switch to open the circuit turning
the condenser fan off. When the pressure builds back up, the fan
comes back on. This ensures a pressure differential at the metering
device at the evaporator so the unit will operate properly. If you
understand this cycle, GROK what will happen during warm weather when
the Freon charge is low. The pressure switch is open because of low
pressure caused by low refrigerant and then builds as the compressor
runs until it becomes high enough to trip the pressure switch turning
the condenser fan on. The running fan causes the high side pressure to
drop thus tripping the pressure switch off which in turn cuts power to
the condenser fan and the cycle starts again. So you see, the fan will
cycle when pressure drops in cold weather or when the pressure increases
with a low Freon charge during warm weather. I hope I explained it well
The problem was the defrost unit (defrost indicator, defrost sensor,
whatever it is called). He had one of these on hand but used it
recently and had not received the replacement yet. So for the time
being he bypassed it, waiting for the part to come in.
On Wed, 27 Apr 2011 07:57:03 -0400, "Stormin Mormon"
Yes, and thank you all.
I think this was the cause of the problem that I had two years ago
when it was putting out hot air (not just room temp). Another repair
place came out 5 times, replaced several things, and never seemed to
get to the heart of it. I disconnected the heat strips at the
thermostat and at least that kept it from putting out hot air.
This guy said that it sounded like the defrost thing over the phone,
and he went right to it. I lowered the thermostat to make it come on,
it started that cycling, and with his electrical meter after two
cycles he said "that's it".
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