Hitachi SET FREE Serie Manual De Instrucciones página 35

PIPING WORK AND REFRIGERANT CHARGE
Insulate the flare nut and union of the piping connection with
insulation.
Check to ensure that there is no gas leakage. If a large
refrigerant leakage occurs, it will cause difficulty with breathing
or harmful gases would occur if a fire was being used in the
room.
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N O T E
The gas staying at O-ring or screw part may make sound when removing
the cap of the spindle. However, it is not gas leakage.
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C A U T I O N
Do not apply an excessive force to the spindle valve after fully opening the
spindle. Otherwise, the spindle valve flies out due to refrigerant pressure.
At the test run, open fully the spindle valve, otherwise, the devices will be
damaged. (It is closed before shipment).
8.6 AUTOMATIC SIMPLE JUDGEMENT SYSTEM FOR REFRIGERANT AMOUNT
Perform the refrigerant amount check operation according to the automatic judgement function after the refrigerant charging work.
When the judgement result is excessive refrigerant, insufficient refrigerant or abnormal termination, find out the cause of abnormality
and perform the refrigerant amount check operation again.
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Procedure of refrigerant amount check operation
1 Reassemble all the cover except for the electrical control
box cover and service cover of No.1 unit.
2 Turn ON the power supply of indoor unit and outdoor unit in
the refrigerant cycle to perform the refrigerant amount check
operation. (Supply electrical power to the system 12 hours
before starting this check operation to warm the compressor
oil.)
3 Turn number 4 of DSW5 (PCB1) ON. The 7-segment display
will be indicated as follows:
4 Check the 7-segment display and press PSW1. The
outdoor fan and compressor will be in standby state and the
7-segment display will be indicated as follows:
The outdoor fan and compressor will be activated and the
7-segment display will be indicated as follows:
25 PMML0392B rev.1 - 07/2016
Caution for opening stop valve
1 Do not apply an excessive force after fully opening the
spindle. (Tightening Torque: < 5.0N.m).
2 Tighten securely the caps according to the properly
tightening torque each spindle valve is opened.
a. Operate the compressor in the cooling mode and charge
the additional refrigerant from the check joint of the liquid
stop valve (acceptable error must be within 0.5 kg). At
this time, keep the liquid stop valve slightly opened
b. After the refrigerant is charged, fully open the liquid stop
valve and the gas stop valve.
c. Calculate securely the additional refrigerant quantity for
charging. If the quantity of additional refrigerant is not
correct, it may cause compressor failure. The additional
refrigerant must be charged in a liquid condition.
d. Refrigerant charge from check joint of gas stop valve
may lead to compressor failure. Be sure to charge
refrigerant from the check joint of liquid stop valve.
The judgement takes 30 to 40 minutes. Refer to the table below
for the result indication.
When the judgement result is excessive refrigerant, insufficient
refrigerant or abnormal termination, find out the cause of
abnormality and perform the refrigerant amount check operation
again.
5 Turn OFF number 4 pin of DSW5 when the refrigerant
amount is sufficient. Wait for at least 3 minutes after turning
OFF number 4 pin of DSW5 OFF and then the outdoor unit
is ready to operate.
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N O T E
• This function is applicable when outdoor air temperature is 0 to 43ºC
DB and indoor air temperature is 10 to 32ºC DB.
• Operation check or condition check shall be performed by checking
the PCB1 for the outdoor unit. During the checking, do not remove the
front cover. Otherwise, the checking will not be conducted normally
due to pressure increase. For combination outdoor unit, the checking
shall be conducted at the unit A and so service covers for the other
unit (B, C or D) must be closed.