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8.5
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 ou
the cause of abnormality 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 be performed 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 No.4 of DSW5 (PCB1) ON.
7-segment Display
(4) Check the 7-segment display and press PSW1.
The outdoor fan and compressor will be activated and the 7-segment display will be indicated the
following figure
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
Judgement Result Indication
7-segment
Result
Indication
Sufficien
Refrigerant
Excessive
Refrigerant
Insufficient
Refrigerant
Abnormal
Termination
(5) Turn No.4 of DSW5 OFF when the refrigerant amount is sufficient
Wait 3 minutes (at least) after turning No.4 of DSW5 OFF and then the outdoor unit is ready to operate.
NOTE:
The 7-segment indication during the check operation may be changed to the protection control code by
the activation of protection control, however it is normal. As for the protection control code, refer to the
sheet attached to the inside of the outdoor unit service cover.
NOTE:
1. Emissions of the fluorocarbons are prohibited
2. In case of disposal and maintenance of this product, collection of fluorocarbons is required
3. Regarding the fluorocarbon, the specification label or refr erant label attached to the product should
be followed. After the additional refrigerant charge, record the total refrigerant (= refrigerant before
shipment + additional refrigerant in the field) in the refrigerant label
50
The refrigerant amount is sufficient
' Turn No.4 of DSW5 OFF and perform 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 termination, restart the check operation.
(1) Is No.4 pin of DSW5 ON before turning on the power supply?
(2) Are all indoor units ready and waiting, before turned ON No.4 pin of DSW5?
(3) Is the outdoor ambient temperature within the applicable range (-5 to 43
(In some cases, when the connected indoor unit number exceeds the
recommended number and the outdoor ambient temperature exceeds 35
this check operation cannot be performed.)
(4) Is the total indoor units operation capacity 30% (indoor units capacity ratio) or
less?
(5) Is No.4 of DSW4 (compressor forced stoppage) OFF?
Remarks
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