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. Under all circumstances, the EN378 (or
other applicable local safety regulations) requirements
must be fulfilled.
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 to 20%
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 fans staging
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 22: Compressor Nameplate Information
Figure 23: 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
OM 920-6 • MICROTECH UNIT CONTROLLER 124 www.DaikinApplied.com
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