Pump Down Residual Operation - Daikin SkyAir RZQ200 · 250C7Y1B Service Manual

Outdoor Unit
2.4.5.3 Heating Operation High Outdoor Air Temperature Control
Under heating overload conditions, the outdoor unit fan is controlled to protect the compressor.
2.4.5.4 Discharge Pipe Temperature Protection Control
Controls discharge pipe temperature and compressor operation frequency to prevent compressor
internal temperature from abnormal rising.
[Inverter compressor]
operation
Tdi: Inverter compressor discharge pipe temperature (°C)

2.4.5.5 Pump Down Residual Operation

Conducts pump down residual operation when compressor stops to collect refrigerant in
evaporator for preventing liquid refrigerant from remaining in the evaporator.
[Contents of control]
Compressor:124Hz
Electronic expansion valve: 0 pls (fixed opening degree)
Solenoid valve for receiver gas purging (SVG): ON (open)
[Ending condition]
66
·
Hp-Lp<0.4MPa
·
OR
·
Compression ratio <1.8
&
·
Lp>0.98MPa
Tdi>105ºC
Prohibition of
Normal
compressor
frequency up
Tdi<105ºC
OR
Normal Operation
OR
Outdoor unit fan:
Down by one step
Tdi>110ºC
Compressor
frequency
-1 step/ 30 sec.
·
& ·
Compressor
frequency
60 seconds elapsed with residual operation
LP<0.27 MPa (when cooling)
LP<0.14 MPa (when heating)
·
Hp-Lp>0.8MPa
·
·
&
Compression ratio >2.6
·
Lp<0.59MPa
·
Tdi≥115ºC continues
for 10 min.
OR
·
Tdi≥135ºC
52Hz
Tdi>130ºC
62Hz
Function and Operation
SiBE26-701