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Tool Talk Discussion Forum

Air Conditioning unit Condenser

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MN Joe

12-04-2008 14:46:42




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IS it necessary to shut off the Power to the Out Side Condenser Unit, it has a small heater unit in that system, but why have it on in the Winter, just a waste of money for heating I'd say ...




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Bob

12-05-2008 20:36:34




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 Shut it off. in reply to MN Joe, 12-04-2008 14:46:42  
The only reason the compressor crankcase heater is necessary is to keep the compressor sump above ambient so the refrigerant doesn't pool there, which would break the compressor at startup. If you shut the main power off, there is no chance of a startup (by a "blem" turning the thermostat to "cool"), so NO problem.

In the spring, turn the main power on 12 to 24 hours BEFORE setting the system to "COOL".

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MN Joe

12-06-2008 03:38:55




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 Re: Shut it off. in reply to Bob, 12-05-2008 20:36:34  
Thanks, But how are you going to know the Heater is working ????? ?



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Guido

12-05-2008 06:45:00




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-04-2008 14:46:42  
Mn joe.
All refrigeration and a/c systems carry oil with the refrigerant 5% by volume. The oil is carried back to the compressor where a screen cathes it and it goes down to the bottom of the compressor.
Like a four cycle engine oil gets by the valves or piston rings with no harm to the system.
The heater is for keeping the compressor from liquid refrigerant. The conpressor is a vapor pump and liquid would distroy it.
Guido.

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MN Joe

12-05-2008 07:28:22




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 Re: Air Conditioning unit Condenser in reply to Guido, 12-05-2008 06:45:00  
So how do you know that the heater is Working ?? if you have to take the unit all apart to check that --- there should be some kind of easy check for the Working Heater you'd think ....



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Guido

12-05-2008 09:49:35




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-05-2008 07:28:22  
Hello Mn joe
One way to check the heater with the power off and check for continuity.
Or while the heater is on with an amp meater/probe. They are usually pretty reliable and an led would only indicate that power was reaching the unit. I know its frustrating how some units are disigned. They are like cars they all go down the road, but they are not the same.
My 2 cents. Guido.



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MN Joe

12-05-2008 11:18:35




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 Re: Air Conditioning unit Condenser in reply to Guido, 12-05-2008 09:49:35  
Guido --- If I installed a LED on the heater, I would put one on each end, that way I would know if the heater was getting juice -- to check the heater one day, and the next day it burns out is no use to me.

I have a Trane model TTX724A100A This is my second unit, cause the First one I had burned the heater out, and that made the unit go bad ---



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Guido

12-06-2008 08:39:19




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-05-2008 11:18:35  
Mn joe.
That would work for sure!
It would check power at both ends Makes sense . My thought was to put only on in the power in?
Guido.



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T_Bone

12-06-2008 00:33:32




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-05-2008 11:18:35  
Hi Joe,

You can also use a suction line accumulator for the same problem. Here all the refrigerant is returned to the accumulator first then vapor fed too the compressor. 100% mechanical effective at stopping liquid refrigerant flow.

The better units use this method as it cost about $150 extra if installed during a compressor replacement where as a can heater is $10 to the mfg.

A lamp in series with the can heater would also tell you at a glance if the heater was working or not. If the lamp or heater is not working the lamp would have not light.

T_Bone

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Crem

12-04-2008 20:48:30




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-04-2008 14:46:42  
Yes, turn it off. I always turned mine off after the cooling season but I forgot to do it this year. Thanks for the reminder. We need to save all of the energy that we can.



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Jiles

12-04-2008 17:33:26




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-04-2008 14:46:42  
No if you are referring to a heat pump.



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Tom from Buckeye Lake

12-04-2008 15:07:21




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 Re: Air Conditioning unit Condenser in reply to MN Joe, 12-04-2008 14:46:42  
Been shuting mine off during the winter for twenty years without problems. Just make sure you turn it back on at least one day before you turn the stat down next summer. The oil in the compressor has to warm up.



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T_Bone

12-04-2008 23:44:47




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 Re: Air Conditioning unit Condenser in reply to Tom from Buckeye Lake, 12-04-2008 15:07:21  
Hi Tom,

Some refrigeration evaporators carry oil thru them at minus 40�f on a continuous cycle with out any problems.

The can heater is too keep the compressor from flooding with liquid refrigerant.

T_Bone



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MN Joe

12-05-2008 02:56:45




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 Re: Air Conditioning unit Condenser in reply to T_Bone, 12-04-2008 23:44:47  
Thanks --- but how does anyone know if the heater is Working ????? ???? there is no way to tell unless you take the cover off the Condenser and look to see if it's working -- that seems like a lot of work just for a simple heater, these Engineers who make these things sure don't know common sense ....

what they should design is a running LED Light on the heater, that would make sense ...

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