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RB SERIES ENGINEERING GUIDE
Inside the RB Series cont.
Blower Motor and Housing
High efficiency low rpm galvanized direct drive blower featuring
3 speed permanently split capacitor (PSC) motor, 5-Speed ECM
motor, and optional Variable Speed ECM blower motor. The
Variable Speed ECM motor is controlled directly through the unit's
microprocessor control. The lower rpm blower also reduces air
noise. All PSC and 5-Speed ECM motors have speed selection
terminal strip on the motor for easy speed change. All motors are
vibration isolated to reduce noise. Horizontal units can be field
converted from end to side discharge as well.
NOTE: 460V 5-Speed ECM blower motor does not require a
neutral wire.
5-Speed ECM Constant Torque Motors
The 5-Speed ECM is a ‘Constant Torque’ ECM motor and delivers
airflow similar to a PSC but operates as efficiently as an Variable
Speed ECM motor. Because it’s an ECM motor, the 5-Speed
ECM can ramp slowly up or down like the Variable Speed ECM
motor. There are 5 possible speed taps available on the 5-Speed
ECM motor with #1 being the lowest airflow and #5 being the
highest airflow. These speed selections are preset at the time of
manufacture and are easily changed in the field if necessary.
5-Speed ECM Benefits:
- High efficiency
- Soft start
- 5 speeds with up to 4 speeds on-line
- Built in logic allows air flow to change with G, Y1, Y2
and W signals
- Super efficient low airflow continuous blower setting (G)
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