AAON RN-140 - Manual (Page 81)

81
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
WattMaster Unit Controls the
WattMaster Condenser Head Pressure
Module is used to maintain a discharge
pressure. The VFD should be factory wired
to the outputs of the WattMaster Condenser
Head Pressure Module. See WattMaster
literature for additional information.
(http://www.orioncontrols.com).
With JENEsys Unit Controls the controller
directly modulates the VFD to maintain a
discharge pressure.