Hitachi FSXN Series Service Manual page 150

7 Test run
DSW5-4
< Procedure of refrigerant amount check operation >
ON
(1) Check that the power supply to all the indoor units is
disconnected.
(2) Place contact 4 of DSW5 (on PCB1 of the main outdoor unit) to
1 2 3 4 5 6
the ON position as shown in the picture.
The 7-segment display will indicate:
The refrigerant amount judgement is carried out automatically during cooling operation (this function is not available during
the heating operation).
Before starting, check the indoor and outdoor air temperature.
(3) Check the 7-segment display and press PSW1. The outdoor unit fan and the compressor will be activated. The display
will indicate:
The judgement takes between 30 and 40 minutes to carry out.
Check the data obtained against the following table.
When the result of the test is excessive refrigerant charge, insufficient refrigerant or abnormal termination, find the cause
of the abnormality and carry out the refrigerant amount check operation in the unit once again.
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SMGB0065 rev. 1 - 12/2010