Daikin VRV X RXQ6-48ANR Series, Руководство по обслуживанию

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SiME341909EA Special Control
Part 4 Functions and Control 69
7.2 Oil Return Control
In order to prevent the compressor from running out of oil, the oil return control is conducted to
recover oil that has flowed out from the compressor to the system side.
Tc : High pressure equivalent saturation temperature
Te : Low pressure equivalent saturation temperature
Ts: Suction pipe temperature detected by thermistor R3T
Starting Conditions
 Oil return control is not conducted before 2 hours have elapsed from the activation of power
supply.
 After 2 hours have elapsed, oil return control starts when the following item meets the
reference value.
 Total amount of oil discharged from the compressor
(The total amount of oil discharged from the compressor is computed from Tc, Te, and
compressor loads.)
 Oil return control starts every 8 hours of cumulative operation of the compressor, even if the
reference value is not met.
Part Name
Electric
Symbol
RXQ6/8AR RXQ10/12AR RXQ14/16AR Function of Functional Part
Compressor 1 M1C
  
Capacity step PI control
Compressor 2 M2C — —

Inverter fan 1 M1F
  
TC control
Inverter fan 2 M2F —
 
Electronic expansion valve
(Injection)
Y2E
  
0 pulse
Electronic expansion valve
(Refrigerant auto charge)
Y4E
  
480 pulse
Solenoid valve (Oil return 1) Y3S
  
ON
Solenoid valve (Oil return 2) Y4S — —

Ending conditions
&
OR
· A lapse of 3 minutes.
· Ts1–Te < 3°C
· A lapse of 6 minutes
while the frequency
is more than that of
oil return control.
Indoor unit actuator Cooling oil return control
Fan Thermostat ON unit Remote controller setting
Non-operating unit OFF
Thermostat OFF unit Remote controller setting
Electronic expansion valve Thermostat ON unit Normal control
Non-operating unit 224 pulse
Thermostat OFF unit Normal control with forced thermostat
ON