Mitsubishi Electric PURY-P120, Service Handbook

Page: 184 / 411

[
VIII
Test Run Mode ]
- 175 - HWE09130 GB
YES
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?
5°C[9
㩩
F]≤SH on all indoor units.
Has the LEV opening been stabilized
on all indoor units ?
NO
Does the following hold true?
SC11
㧨
5°C[9°F]
YES
NO
Does the following hold true ?
5°C[9°F]≤SC11≤15°C[27°F]
㧔
on the BC
㧕
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 on SW4-3 on the OC.
Adjustment complete
Turn off SW4-3 on the OC.
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 amout
to determine its adequacy.
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.
Is the TH4 value of the OC and OS
at or below 100°C [212°F]?
Has the operating frequency
of the compressor on the OC and OS
become stable?
Does the following hold true ?
TH4≤95°C[203 㩩 F] on the OC and OS
Does the following hold true ?
15°C[27°F]≤SC16 㧔 on the BC 㧕
Operation of the Refrigerant Amount Adjust Mode
When the unit is the refrigerant amount adjust mode, the LEV on the
indoor unit does not open as fully as it normally does during cooling
operation to secure subcooling.
Note
1) SW4-3 on the OS is invalid, and the unit will not go into the refrigerant
amount adjust mode.
2) There may be cases when the refrigerant amount may seem adequate
for a short while after starting the unit in the refrigerant amount adjust
mode but turn out to be inadequate later on (when the refrigerant
system stabilizes).
3) High pressure must be at least 2.0MPa[290psi] to enable a proper
adjustment of refrigerant amount to be made.
4) Refrigerant amount adjust mode automatically ends 90 minutes after
beginning.
When this happens, by turning off the SW4-3 and turning them back on,
the unit will go back into the refrigerant amount adjust mode.
CAUTION
Do not release the extracted refrigerant into the air.
CAUTION
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
Œ
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may
result in performance loss.