AAON SB-018 - Manual (Page 28)

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During startup, it is necessary to perform
routine checks on the performance of the
unit. This includes checking of the air flow,
the air filters, condenser water flow and
refrigerant charge.
Supply Fans
SB Series units are equipped with direct
drive backward curved plenum supply fan
assemblies that deliver the air volume
specified according to unit size and job
requirements.
Figure 5 - SB Series Supply Fan
Supply Fan Airflow Adjustment
Supply fan Electronically Commutated
Motors (ECM) speed adjustment may be
required at startup for airflow adjustment.
With WattMaster controls supply fans are
controlled directly from the controller with a
0-10 VDC signal.
With customer provided field installed
controls the supply fans can be controlled
with either a factory installed potentiometer
or with a 0-10 VDC signal provided by the
controller.
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING