Mitsubishi Electric PUHY-(E)P300, Service Handbook, Page: 122 / 302

[
VIII
Test Run Mode ]
- 113 -
HWE07010 GB
CAUTION
Do not release the extracted refrigerant into the air.
CAUTION
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
ΠIf gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may
result in performance loss.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
Start
Put all indoor units in the test run mode
and run the units in cooling mode.
Has it been at least
30 minutes since
start up?
Note 3
Note 1
Does 8K [14 F] Tc-TH3 12K [22 F] hold true?
(Use the largest “Tc - TH3” value of the
OC, OS1, and OS2.)
Does the following hold true?
Tc-TH3 8K [14°F]
*Refer to the previous page for *Notes 1-4 in the chart.
Note 2
Note 2
Note 2
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.
Keep the unit running for 5 minutes after adjusting the
refrigerant amount to determine its adequacy.
Turn off SW4-3 on the OC.
Turn on SW4-3 on the OC.
Adjustment complete
Note 4
Has the initial start-up
mode been completed?
Gradually add refrigerant from
the service port on the low
pressure side.
Gradually add refrigerant from
the service port on the low
pressure side.
Keep the unit running for 5 minutes
after adjusting the refrigerant amount
and check(Tc-TH3)
Gradually add refrigerant from
the service port on the low
pressure side. Gradually draw out
refrigerant from the service
port on the low pressure side.
Does Tc-TH6 20K [36 F] hold true?
Is the TH4 value of the OC, OS1,
OS2 at or below 100 C [212 F]?
Has the operating frequency
of the compressor on the OC, OS1,
and OS2 become stable?
N
ote
1
Is the TH4 value of the OC, OS1,
OS2 at or below 95 C [203 F]
(Check this item on the unit whose “Tc – TH3” value was
used in the step above.)