59
Condenser Fan Electronically
Commutated Motor (ECM) Startup
The fan cycling option uses a fan cycle switch
to switch between one of the discrete speed
inputs (see
Table 19) on the motor thus cycling between
two preset speeds based upon discharge
pressure of the unit. By connecting 24VAC
to a single or combination of the yellow,
white, or orange wires, the motor will run at
the discrete speeds in
Table 19.
With Customer Provided Unit Controls or
AAON Condenser Head Pressure Module is
used for variable speed control of the motor
to maintain a head pressure. The motor is
factory wired to the PWM outputs of the
AAON Condenser Head Pressure Module.
See AAON literature for further information.
(https://www.aaon.com/Controls)
Note
High voltage wires out of the motor:
Black & Brown - 1 Phase Line Voltage
Green - Ground
Low control voltage wires out of the motor:
Blue - Common
Yellow - Variable Speed Control
Table 19 - ECM Condenser Fan Cycling Options
VFD Controlled Condenser Fan Startup
With Customer Provided Unit Controls the
VFD’s are factory provided and factory
programmed. VFD’s receives input from
pressure transducers on each refrigerant
circuit and vary the fan speed based on the
pressure inputs to maintain a discharge
(head) pressure. Standard pressure setpoint is
340 psi for standard air-cooled systems and
400 psi for modulating hot gas reheat air-
cooled systems.
With the AAON Condenser Head Pressure
Module is used to maintain a discharge
pressure. The VFD is factory wired to the
outputs of the AAON Condenser Head
Pressure Module. See AAON literature for
additional information.
(https://www.aaon.com/Controls).
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