I have just moved into a house with Central Air Conditioning. The main
electrical breaker was shut off for the winter as recommended. How long
after you switch it back on, should one wait till he decides to use it.
There are certain theories from 20 minutes to 24 hrs, I know it is to
energies the capacitor but I would like other opinions.
Any help would be appreciated.
Actually, you know incorrectly. Capacitors charge instantly. What is the
concern is the crankcase heater, and refrigerant liquid diluting the
24 hours is a good figure.
Since the last folks were moving out, they may have neglected the maint.
Might want to call a HVAC company to come out and do the maint. Clean the
coils, check the freon, etc.
This is Turtle.
Just about every brand condensers I have ever installed had on the paper work
this. Wait 24 hours with power on before operating when you have had the 220
power off for more than 24 hours. So wait 24 hour and be sure.
Huh? I think someone had been smoking something
before they made up those theories. What do you
think flipping the main breaker energizes? Hint:
nothing. Nothing happens to your A/C until the
thermostat turns it on. So, by the time you flip
the main switch and walk to the thermostat to turn
it will be just fine. Maybe you are thinking
about the length of time you should wait after
moving a refrigerator/freezer before plugging it in.
Not so fast....
If a unit has a crankcase heater, it is energized all of the time. It is
connected to the line side of the contactor. In other words, even when the
unit is not running, the crankcase heater IS. (As long as there is power to
Yeah I forgot about crankcase heaters because my
AC doesn't have one. Where I am you don't turn
the AC on unless it gets warm, so a crankcase
heater is useless and is pretty much a wasted
option. Even if you have a crankcase heater the
overide switch turns it off when the temperature
rises above a certain point. I suppose they are
useful in places where you use the AC at lower
temperatures as a dehumidifier.
This is Turtle
I would not call them a waisted option. I have seen people turn on the cooling
mode in freezing weather outdoors and Blow the valve plates out of their piston
compressor and cost them $700.00 to $1,000.00 by not having one. It keeps the
compressor warm even when your not thinking about it. I would not turn one off
because turning it back on could be a problem in cool or freezing weather, but
not too much in hot weather. There is not too much of the problem when turning
on the power on to operate it but during cold spells it keeps the compressor
warm to be able to start in those cold times without busting the valve plates in
the compressor. The real good of having one comes diuring the whole years when
your using it. Then you have to concider Heat pumps and the compressor running
in cold weather. That little cost of that crank case heater is worth it.
Didn't know it would be quite that violent. I
understand the need for a crankcase heater for a
heat pumps because they operated at much lower
temperatures. But operation of a central AC
shouldn't be needed until the ambient temperature
rises above 70 F, and anyone that turns one on
when the temp is less than 60 degrees (assuming it
isn't needed for humidity reduction) should be
shot for general wastefulness. Here, we don't
turn on an AC until maximum daily temp gets above
80 degrees because low night time temperatures
reduce the need for cooling.
I don't know what the standard cutout temperature
(temperature that turns off the crankcase heater)
is, but I would imagine it would be lower than any
temperature I would likely turn the AC on.
This is turtle.
You know about the cause and problem that can happen when cranking the
compressors in freezing weather with not crank case heater running on it but
there is 100 of thousands of operator of HVAC thermostats that have not a clue
as to blowing the valve plates of a compressor by turning it on in freezing
weather. The statement about the crank case heater is for the unknowing and not
to the knowing.
I realize that Turtle, I just get cranked a bit
about some of the extra features and go tilting at
wind mills. Most consumers are so dumb that the
manufacturer have no choice but to include all
sorts of extras to keep the consumer from
destroying the product. As one adds more and more
of these features, however, the more complicated
it becomes, the more break downs and failure that
occur, and the greater the cost of the product.
This is Turtle.
Crank Case heater is a old time item to have because they were on the 1950's
models of system then when I was a kid. They saved compressors then just like
today. These Crank case heater are really a item to save compressor today but
mostly in the North where you get minus number on the thermometer readings.
There is a lot of bull on systems today but the crank case heater is still a
good one to have to save compressors.
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