Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 154

[6-3 Evaluating and Adjusting Refrigerant Charge ]
Keep the unit running for 5 minutes after
adjusting the refrigerant amount to
determine its adequacy.
Note 2
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.
For information about Notes 1 through 4 in the flowchart, refer to items 1) through 4) on the previous page.
CAUTION
Do not release the extracted refrigerant into the air.
BS_06_E
Start
Turn on SW4 (922) on the OC.
Put all indoor units in the test run mode
and run the units in cooling mode.
Has the initial start-up
mode been completed?
YES
Has it been at least
30 minutes since
start up?
YES
Is the TH4 value of the OC
at or below 100°C [212°F]?
N 1
ote
YES
Has the operating frequency
of the compressor on the OC
become stable?
Note 3
YES
Does 8°C [46.4°F] ≤ Tc-TH3 ≤ 12°C [53.6°F] hold true?
(Use the largest "Tc - TH3" value of the
OC, OS1, and OS2.)
Note 1
YES
NO
≥
Does TH2-Te 10°C [50°F] hold true?
(Check this item on the unit whose "Tc – TH3" value was
used in the step above.)
Note 1
YES
Note 2
NO
Is the TH4 value of the OC
at or below 95°C [203°F]
YES
Adjustment complete
Turn off SW4 (922) on the OC.
Note 4
YES
NO
NO
NO
Gradually add refrigerant from
NO
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-TH3)
Does the following hold true?
<
Tc-TH3 8°C [46.4°F]
YES
Gradually add refrigerant from
the service port on the low
pressure side.
Note 2
NO
Gradually draw out
refrigerant from the service
port on the low pressure side.
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chapter 6 -