Mitsubishi Electric PUHY-200YMF-B Service Handbook page 90

2) Refrigerant adjustment in cooling season
1 Flow chart
Adjustment start
Cooling operations of all indoor units
in test run mode.
After compressor start, turn on
refrigerant amount adjustment switch
(SW2-4) of outdoor unit.
Operations status
stabilized?
Liquid level of accumulator
indicates AL=0?
Charge refrigerant from low pressure
service port little by little.
Liquid level changed from
AL=0 to AL=1?
Finish refrigerant.
Calculate adjustment (Wkg) as shown
in separate table.
Parameter:
frequency, low pressure, piping
length, outdoor unit capacity
Adjustment (W) minus?
Recover adjustment to refrigerant from
High pressure Ball valve (BV2) service
port by setting refrigerant recovering
time as a standard.
Turn off refrigerant amount adjustment
switch (SW2-4)
Adjustment finished.
* Valid for only 2 hours in the test run mode. All work must therefore be carried out
within 2 hours. Select the test run mode again if more than 2 hours is required.
* The coolant volume adjustment mode extends for 2 hours after SW2-4 is set to ON.
All work must therefore be carried out within 2 hours. Switch SW2-4 OFF → ON if
more than 2 hours is required.
–88–
for PURY-(P)200·250YMF-B
YES
NO
Recover refrigerant little by little from
low pressure service port.
Liquid level changed from
AL=1 to AL=0?
Finish refrigerant purge.
Replenish ajustment of refrigerant from
low pressure service port.