Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 174

Keep the unit running for 5 minutes after
adjusting the refrigerant amount to
determine its adequacy.
Note 1
Gradually add refrigerant from
the service port on the low
pressure side.
Keep the unit running for 5 minutes after adjusting the
refrigerant amount to determine its adequacy.
Gradually add refrigerant from
the service port on the low
pressure side.
CAUTION
Do not release the extracted refrigerant into the air.
CAUTION
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may
result in performance loss.
Start
SW2-4 ON
Put all indoor units in the test run mode
and run the units in cooling mode.
Has the initial start-up
mode been completed?
Has it been at least
30 minutes since
start up?
YES
Does the following hold true?
TH1 100 C [212 F]
YES
Has the compressor
operating frequency
stabilized?
Note 2
YES
Does the following hold true?
8K [14 F] Tc-TH5 12K [22 F]
YES
NO
Does the following hold true?
Tc-TH7 20K [36 F]
Note 3
YES
Note 1
NO
Does the following hold true?
TH11 95 C [203 F]
YES
Adjustment complete
SW2-4 OFF Note 4
- 165 -
YES
NO
*Refer to the previous page for *Notes 1-4 in the chart.
NO
NO
NO Gradually add refrigerant from
the service port on the low-
pressure side.
NO
NO
Keep the unit running for 5 minutes
after adjusting the refrigerant amount
and check(Tc-TH5)
Does the following hold true?
Tc-TH5 8K [14°F]
YES
Gradually add refrigerant from
the service port on the low
pressure side.
[ VIII Test Run Mode ]
Note 1
NO
Gradually draw out
refrigerant from the service
port on the low pressure side.