Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 71

(3) Refrigerant amount adjustment
Adjustment starts.
Start cooling operation of all indoor
units in a test run mode. Note 1
Has the
compressor been
operated for more than
30min?
Was the operation
condition stabilized?
The high pressure
> 13kg/cm 2 G?
Operate for 5 minutes after adjusting the refrigerant and make a judgement.
= <
TH1 115˚C?
Are all indoor
units SHs more
than 6deg?
Is the LEV opening
degree stable when SH
Operate for 5 minutes after adjusting the refrigerant and make a judgement.
= <
5deg SC11?
Note 2
Operate for 5 minutes after adjusting the refrigerant and make a judgement.
= < = <
10 SC16 30deg?
Note 3
Operate for 5 minutes after adjusting the refrigerant and make a judgement.
= <
TH1 110˚C?
Adjustment completed.
Fill refrigerant little by little from the
low-pressure side service port.
< 6deg?
Fill refrigerant little by little from the
low-pressure side service port.
Retrieve the refrigerant little by little
30deg < SC16? from the low-pressure side service
port.
Fill refrigerant little by little from the
low-pressure side service port.
Fill refrigerant little by little from the
low-pressure side service port.
YES
NO
Note 1) As the refrigerant volume can not be adjusted in the heating mode,
retrieve the refrigerant, evacuate air and then fill the specified
volume of refrigerant if it is necessary to adjust the refrigerant
volume in the winter season.
Stop the refrigerant volume adjustment
and retrieve the refrigerant. After
evacuating air, fill the specified volume
of refrigerant.
Note 2) SC11 : Liquid refrigerant sub-cool for BC controller inlet
Note 3) SC16 : Liquid refrigerant sub-cool for BC controller outlet
–70–
Is the
thermostat turned
on/off in order for the indoor
unit to prevent from
frosting?