© 2006
GE ECM
by Regal-Beloit
- 33 -
Indoor Blower Motors
v0.2
Constant Fan
Installation
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This option is typically factory programmed to operate at 50% - 60% of the
cooling airflow per the manufacturer. Some OEM’s provide the ability to adjust
this setting for customer preference.
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The operation is selected by the consumer at the thermostat.
Benefits
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Continuous air circulation provides:
o
Efficient air filtration
o
Less stratification (the effect of warm air rising and cool air falling).
Remember that in the constant fan mode, this motor is extremely efficient operating
at around 60–90 watts. This is less than the typical household light bulb. A standard
induction motor in constant fan can operate between 400-700 watts.
In some climates constant fan is not recommended due to re-humidification.
Output Options
We have learned that this motor will maintain constant airflow by responding to
changes in duct pressure. Another feature is the use of output information that the
OEM can program for different options.
The most commonly used option is the CFM Demand (blink) Mode. An LED on the
interface or main control board will blink once per 100 CFM of the selected airflow.
- If viewing the indicator requires removing the blower access panel, remember
that RPM will be lower to maintain the selected CFM. However this will not
change the reading on the indicator since it is providing the selected CFM not the
actual CFM.
Another option is to use the limit mode. This function allows the OEM to use the
output signal as an indicator that motor is over or under speed. This information is
typically designed to indicate to the consumer when the filter is blocked by an alert
on the thermostat.
To determine the selected CFM, count the number of flashes between
pauses and multiply by 100 (unless programmed otherwise).
- If the system is in the cooling mode, and the indicator flashed 12
times, the selected CFM is 1200.