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Additional refrigerant charge
9.5 AUTOMATIC SIMPLE JUDGEMENT SYSTEM FOR REFRIGERANT AMOUNT
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 check-
ing, 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.
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 abnor-
mality and perform the refrigerant amount check operation again.
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.)
Judgement result indication
7-segment Indication
Sufficient
refrigerant
Excessive
refrigerant
Insufficient
refrigerant
Abnormal
termination
N O T E
The 7-segment indication during the check operation may be changed to the protection control code by the activation of protection con-
trol. However, it is normal. As for the protection control code, refer to the sheet attached to the inside of the outdoor unit service cover.
55
PMML0294A_rev.2_02-2014.indb 55
Result
The refrigerant amount is sufficient.
•
Turn the pin number 4 of DSW5 OFF and perform the test run.
The refrigerant amount is excessive.
•
Calculate the additional refrigerant amount according to the piping length. Collect the refrigerant using a
collector and charge the correct refrigerant amount.
The refrigerant amount is insufficient.
•
Check if the additional refrigerant has been charged.
•
Calculate the additional refrigerant amount according to the piping length and charge the refrigerant.
Find out the cause of abnormal termination as shown below. After resolved the cause of abnormal termi-
nation, restart the check operation.
1
Is number 4 pin of DSW5 ON before turning on the power supply?
2
Are all indoor units ready and waiting, before turned ON number 4 pin of DSW5?
3
Is the outdoor ambient temperature within the applicable range (0 to 43ºC DB). (In some cases, when
the connected indoor unit number exceeds the recommended number and the outdoor ambient tem-
perature exceeds 35ºC DB, this check operation cannot be performed.)
4
Is the total indoor units operation capacity 30% (indoor units capacity ratio) or less?
5
Is the pin number 4 of DSW4 (compressor forced stoppage) OFF?
PMML0294A rev.2 - 07/2014
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-seg-
ment display will be indicated as follows:
The outdoor fan and compressor will be activated and the 7-seg-
ment display will be indicated as follows:
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 abnor-
mality 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 num-
ber 4 pin of DSW5 OFF and then the outdoor unit is ready to
operate.
Remarks
14/07/2014 12:28:32
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