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Subject Author Date
AC testing corndogking 03-18-2007
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Posted by on March 18, 2007, 9:39 pm
I need to measure the energy consumption of installed residential AC
units (condensing unit only) for a research project. We anticipate
that many times the home owners will not be home when we show up to
make the measurements, and the system will not be running.
In these situations, we have been considering applying 24 VAC to the
condensing unit contactor to start the unit for 30 seconds or so , so
we can make a measurement.
Are we likely to cuase any harm with this procedure? Perhaps heat pump
units that have a electrically operated control valve that wouldn't be
in the proper position?
Thanks for your help.


AppliancePartsPros.com, Inc.
Posted by CJT on March 18, 2007, 9:49 pm
corndogking@yahoo.com wrote:

> I need to measure the energy consumption of installed residential AC
> units (condensing unit only) for a research project. We anticipate
> that many times the home owners will not be home when we show up to
> make the measurements, and the system will not be running.
> In these situations, we have been considering applying 24 VAC to the
> condensing unit contactor to start the unit for 30 seconds or so , so
> we can make a measurement.
> Are we likely to cuase any harm with this procedure? Perhaps heat pump
> units that have a electrically operated control valve that wouldn't be
> in the proper position?
> Thanks for your help.
>
Do you have the homeowners' permission? If so, perhaps you could
arrange a time when they would be home to make your measurements.
If not, perhaps you should consider another project.

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Posted by Noon-Air on March 18, 2007, 9:54 pm

>I need to measure the energy consumption of installed residential AC
> units (condensing unit only) for a research project. We anticipate
> that many times the home owners will not be home when we show up to
> make the measurements, and the system will not be running.
> In these situations, we have been considering applying 24 VAC to the
> condensing unit contactor to start the unit for 30 seconds or so , so
> we can make a measurement.
> Are we likely to cuase any harm with this procedure? Perhaps heat pump
> units that have a electrically operated control valve that wouldn't be
> in the proper position?
> Thanks for your help.

Exactly what measurements are you trying to get?? How is this data going to
be used??

You do realize that any amperage draw readings will not stabilize or be
correct unless the system is correctly charged, and operating properly.
With heat pumps, you can't just jump the contactor and expect it to run
correctly, because it won't.
With the new high efficiency heat pumps and condensers with ECM motors,
jumping the contactor won't even make the fan come on, and with a 2 stage
compressor, only one stage will be energized.




Posted by on March 18, 2007, 9:55 pm

> I need to measure the energy consumption of installed residential AC
> units (condensing unit only) for a research project. We anticipate
> that many times the home owners will not be home when we show up to
> make the measurements, and the system will not be running.


Why wouldn't they be home?
Why would you be measuring their units?


> In these situations, we have been considering applying 24 VAC to the
> condensing unit contactor to start the unit for 30 seconds or so , so
> we can make a measurement.


I see you want to make a service call after your little 'trial and error'
testing.


> Are we likely to cuase any harm with this procedure?


Yep, you sure are... I'd look into what happens when you connect two
transformer outputs together.


> Perhaps heat pump
> units that have a electrically operated control valve that wouldn't be
> in the proper position?
> Thanks for your help.


I'd suggest that you NOT start messing with things you DO NOT understand.
Unless, you have money that you want to spend to repair/replace the things
you blow up in your testing.





Posted by danger on March 18, 2007, 10:46 pm
Yup, I would break both your legs if I ever caught you near my A/C.

Unless the fan is moving air accross the evaporator, inside the house, your
gonna cause
the low side pressure to drop and the lineset and evaporator to freeze.

You think a 30sec cycle will show you anything? It won't.


-Canadian Heat


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