Features Of This Model Series - Daikin RTSQ20PY1 Service Manual

Features of This Model Series

4. Features of This Model Series

This Model Series feature efficient heating operation conducted by adopting the "Two-stage
Compression System" at low outdoor temperatures.
<Two-stage Compression System>
This is a system to conduct efficient heating operation by two-stage compression with two
compressors connected in series.
The system is designed to separate gas and liquid with the "Gas & liquid separator"
incorporated in the function unit to bypass all gas refrigerants that do not contribute to
evaporation to the high-stage-side compressor on the high stage side, thus providing increased
evaporator efficiency.
Furthermore, since the high-stage-side suction gas temperature falls, radiation loss also
reduces to provide increased compressor efficiency.
New System
(At low outdoor temperatures)
Indoor unit
Function unit
Gas & liquid separator
Indoor unit
High-stage-side
compressor
Heating capacity
Indoor unit (condenser)
Expansion valve (1)
Gas & liquid separator
Increase capacity and COP.
Expansion valve (2)
Outdoor unit (evaporator)
Increase COP.
Evaporator capacity
Enthalpy
7
Outdoor unit
Low-stage-side
compressor
High pressure
High-stage-side
compressor
Compressor power input
Intermediate
pressure
Low-stage-side
compressor
Low pressure
Compressor power input
Conventional System
Outdoor unit
Indoor unit
Indoor unit
Compressor
Heating capacity
Indoor unit (condenser)
Expansion valve (1)
Outdoor unit (evaporator)
Evaporator capacity
Enthalpy
SiBE31-801_C
Radiation
loss
High
pressure
Low
Compressor
pressure
power input
General Information