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
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.
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
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.
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