Connect the power supply to the indoor and outdoor units in the same refrigeration cycle for the function to automatically
estimate the amount of refrigerant charged in the unit.
N O T E
• This function
is applicable when the outdoor temperature range is between 0 and 43 °C DB (DB: dry bulb) and
the indoor temperature is between 10 and 32 °C DB (DB: dry bulb).
• For RAS-(20-54)FSXN units, the indications, verifications and consultations of the seven-segment display
should be done on the main unit.
• The electricity supply to the outdoor unit must remain connected twelve hours prior to the test to heat up the
compressor oil.
Turn the DSW5 contact number four (on PCB1) to ON.
The seven-segment display on the unit will indicate:
Check the seven-segment display and press PSW1. The outdoor
unit fan and the compressor will start up. The display will indicate:
The function to automatically estimate the amount of refrigerant charged in the unit takes between 30 and 40 minutes to
make the necessary checks.
Check the result obtained with the following table:
Display indication Result Indications
Sufficient charge
The refrigerant charge is sufficient.
Turn the DSW5 contact number four (on PCB1) to OFF and carry out the test run.
Excessive charge
The refrigerant charge is excessive.
Calculate the refrigerant charge according to the length of the refrigerant pipes.
Collect the
charged refrigerant appropriately and charge the unit with correct amount of
refrigerant.
Insufficient charge
The refrigerant charge is insufficient.
Check whether the unit has been charged with additional refrigerant.
Calculate the refrigerant charge according to the length of the refrigerant pipes.
Charge the unit with the correct amount of refrigerant.
Abnormal completion
Locate the cause of the abnormal completion in line with the instructions below. Once the
cause of the abnormal completion has been solved, restart the check.
1. Is
the DSW5 contact number four (on PCB1) turned to ON before the power supply is
connected?
2. Are all indoor units ready and waiting before DSW5 contact number four (on PCB1) is
turned to ON?
3. Is the outdoor ambient temperature within the working ranges established (0 – 43 °C)? (In
some cases, when the number of indoor units connected exceeds the maximum number
recommended and the outdoor temperature is above 35 °C, the check cannot be made).
4. Is the total operating capacity ratio of the indoor units 30% or less?
5. Is DSW4 contact number four (forced compressor stoppage) turned to OFF?
3 Piping work and
refrigerant charge
62
SMGB0065 rev. 1 - 12/2010
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