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electrical Connections
Special Applications
High Efficiency Constant Fan Operation
The Evergreen IM will automatically operate a fixed high efficiency low
constant fan airflow without a (G) fan connection to the Low Voltage
SIGNAL (speed) taps. When the HVAC System receives a 24VAC (G)
command from the thermostat to the fan controls, they will send 115VAC
to the High Voltage SIGNAL connection(s). If the motor receives voltage on
the High Voltage SIGNAL connection(s) with no voltage on the Low Voltage
SIGNAL connections, the motor will operate at the special high efficiency
low constant fan airflow automatically. See the Sequence of Operation
section on page 28 for more information.
Increasing Constant Fan Airflow
If more airflow is desired during constant fan operation there are two options.
option 1:
Connect any of the Low Voltage SIGNAL (speed) taps on the
motor not being used by a heating or cooling demand to the 24VAC
constant fan (G) thermostat demand.
option 2:
If the speed desired for constant fan is currently being used by
a heating or cooling demand, use the special Y-adapter to connect any
24VAC thermostat demand and the 24VAC constant fan (G) thermostat
demand to the same motor speed. only the meD-HI and loW speeds can
be used with the y-adapter. If HI or meD-loW is currently being used by a
heating or cooling thermostat demand, another speed will have to be used
for the 24VAC constant fan (G) thermostat demand.
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Evergreen IM manual 01-13.indd 16
2/13/13 11:12 AM
