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www.DaikinApplied.com 99 IM 893-10 • ROOFPAK SINGLEZONE UNITS
Variable Speed Scroll Compressor
WARNING
The compressor must only be used for its designed purpose(s)
and within its scope of application (refer to the Operating
Limits). Consult the Application Guidelines and datasheet
available from Danfoss.com. Under all circumstances,
the EN378 (or other applicable local safety regulations)
requirements must be fullled.
Daikin units with variable speed inverter compressor are
engineered with xed speed compressor(s) in such a way
that the unit delivers only the required energy to satisfy space
conditions and provides you with exceptional energy savings.
It improves comfort through precise temperature and humidity
control. Variable speed compressor enhances energy efciency
and capable of providing unit capacity modulation down to15%
and reduces compressor cycling and wear on compressor.
Daikin rooftop units with variable speed Inverter compressors
are provided with Internal Permanent Magnet (IPM) motors.
Compressors are designed to vary capacity by modulating
the speed of the scroll set. The speed ratio for the IPM
motor compressor is 4:1 (25 rps to 100 rps). Condenser fan
modulation and an oil management/monitoring system are
provided for reliable operation. The VFD compressor will
always be on the “lead” circuit and will be the rst one on and
last one off.
Figure 102: Compressor Nameplate Information
Figure 103: Compressor Components
A. Model number
B. Serial number
C. Refrigerant
D. Supply voltage to CDS303 frequency converter
E. Housing service pressure
F. Factory charged lubrication
G. Compressor frequency and MaxMust trip current
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