SiE-05C
Outdoor Unit Refrigerant System Diagrams
Functions PLUS Series
209
A. Compressor
A combination of scroll compressor enabling operation at 30 - 106 Hz by inverter and constant speed type
compressor for carrying out on/off control realizes capacity control in 19 steps, and carries out capacity
control for individual and linear control of indoor units. Compressors are equipped with an oil discharge
function for draining excess oil from the high pressure side.
B. Check valve
Prevents refrigerant from collecting in the constant speed type when operating the inverter type units only.
C. Check valve
Installed so that the inverter type’s oil discharge function functions properly.
D. Oil separator
Device which collected oil discharged from the compressor and returns it to the compressor via capillary
tubes. Also functions as reservoir for holding excess oil.
E. Solenoid valve (for low pressure protection) Y1S
Provides hot gas bypass to prevent low pressure from dropping radically for excessive defrost of load
reduction when the compressor starts.
F. Solenoid valve (for pressure equalization) Y4S
Balances high and low pressure when stopped.
G. Solenoid valve (for liquid injection) Y2S,Y3S
Controls liquid injection to prevent overheating.
H. Solenoid valve (for oil discharge control) Y5S
Discharges excess oil to other outdoor units during oil equalization operation.
I. Outdoor unit electronic expansion valve Y1E
Expansion valve for heating. Senses low pressure and temperature of outdoor unit heat exchanger outlets
and carries out overheating control.
J. High pressure sensor SENPH
Semiconductor pressure sensor for detecting outdoor unit high pressure.
K. Low pressure sensor SENPL
Semiconductor pressure sensor for detecting outdoor unit low pressure.
L. High pressure switches S1HP, S2HP
Switches trip when discharge pressure exceeds 27.5±0.5K, thus stopping operation.
SI-05C.BOOK Page 209 Monday, November 6, 2000 4:13 PM
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