Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 194

[ VIII Test Run Mode ]
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.
CAUTION
Do not release the extracted refrigerant into the air.
CAUTION
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
ŒIf gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may
result in performance loss.
HWE09080
Start
Turn on SW4-3 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, OS
at or below 100°C [212°F]?
N 1
ote
YES
Has the
operating frequency
of the compressor on the OC, OS
become stable?
Note 3
YES
Does SH ≥ 5K [41ºF] hold
true for all indoor units?
YES
Keep the unit running for 5 minutes after adjusting the
refrigerant amount and check(Tc-TH3)
5K[41°F] ≤ SC11?
Note 2
YES
NO
Does 10 ≤ SC16 ≤ 30K [86ºF]
hold true?
Note1
YES
Note 2
NO
Is the TH4 value of the OC, OS
at or below 95°C [203°F]?
YES
Adjustment complete
Turn off SW4-3 on the OC.
Note 4
- 185 -
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
Has the indoor unit
LEV opening stabilized?
Note 2
YES
Note 2
NO
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)
NO
Does 10K [50ºF] > SC16
hole true?
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.
GB