Tip & How-To about Carrier 38BRC036 Air Conditioner
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If your wondering how to check out your refrigeration
compressor;
Modern Compressors have two operations that have to work
together just to run. More items must be considered for them to work and work efficiently
in systems. The 2 areas that must work together are electrical and mechanical. Either
your compressor is broken inside or the motor and or start components are not
working properly.
Electrical
Ohm the compressor terminals to ground and across to
each other.
1. If any read anything to ground the compressor is bad. If
not go on to the next step.
2.Your readings between the compressor terminals should all
be different and you should have 1 low 1 medium and 1 high resistance reading.
Add the low and mid reading together and the sum should be
close to the highest reading. If it reads say 20% more or less then retest it a
couple of times to confirm your not slipping on the terminals. If you get only
2 readings don’t panic wait 24 hours for the motor to cool off for sure and
recheck it. If still no reading then your compressor motor is open. A new
compressor or replacement of the appliance is required. If you now get the 3
readings described make a diagram you feel comfortable with as to where the
wires go to each component before removing anything, then continue:
3 Assuming the above checks out: Get a new *Start relay *start
capacitor if so equipped relay *external overload and *run capacitor if it has
one. In other words everything that is external and attached to the wires or
terminals on the compressor or wiring per your diagram and replace them on to
the compressor. Then if it starts problem solved if it still does same thing
the compressor is bad (broken mechanically inside the compressor) and you have
to decide to replace compressor or replace the refrigerating compressor be it
AC or Refrigeration.
*May or May NOT have this component:
*Start Relay:
MOST 99.999…% of refrigerators of the household type have a
start relay of some kind and they vary in size shape and color. It plugs directly
onto the compressor. SOME AC units but not all have one and it is different.
These Resemble a box about 2”X2” X 3” with at least 3 terminals on it and these
3 terminals are marked 1, 2, & 5. Each of these will have at least 1 wire
on them and there may be other terminals (4 & 6) as well that can be used
with several wires on each.
* Start Capacitor
100% of AC and Commercial compressors that use a start relay (and remember some do not have one but those
that do…) and only some domestic refrigerators use a Start Capacitor. At least
2 wires going to a black (usually) cylinder which is the start capacitor. Start
Capacitors ALWAYS HAVE 2 or more Wires and ALWAYS HAVE TO HAVE A START RELAY.
*External Overload
MOST 99.9% of Household refrigerators, 80%+ of smaller
commercial refrigerators, and most 90% of window unit AC’s but almost no
central AC compressors Have an external overload. Those that do not have an
internal overload. These vary in size and color and description a basic one is
round 2 wires and generally black about quarter size USA AND IF USED ALWAYS
MOUNTED ON THE COMPRESSOR with the other wires and terminals there.
*Run Capacitor
Some domestic refrigerators (can be a small rectangular box)
medium and larger refrigeration and (99.999%... of all) AC central and Window units
have a compressor that requires a run capacitor. These type units also have a fan
motor that can require a run capacitor. These Capacitors always have at least 2
wires and often 3 or more if the capacitor also is wired to the fan motor.
.
If a compressor is tight due to linear expansion from heat a tip worth remembering
is as something cools it contracts, except for water at freezing. A few times I
have gotten a compressor to start after leaving it off for 6 to 12 hours then
retrying it. See the compressor unless left off for 6 to 12 hours and sometimes
as long as 24 hours may have expanded parts from heat. About 1/2 the time it is
ok after new start components are installed with a start capacitor and relay.
The other 1/2 the compressor will be ok for a day or 2 then stop again. A “hard
spot” in the movement of the internal parts in the compressor, and stopping on
this hard spot it can’t overcome the “tightness”.
If you follow most of these steps above you will arrive at a
correct diagnosis well over 90% of the time ( allowing for what is unusual or
for misunderstandings)
30 years of doing refrigeration and this has not changed..
Please rate me as high as you can and ask me to clarify
anything you don’t understand.
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