Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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< Judgment Result Indication >
7-segment Indication Result Remarks
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Refrigerant
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* Turn No.4 pin of DSW5 OFF and perform Test Run.
Excessive
Refrigerant
The refrigerant quantity is excessive.
* Calculate the additional refrigerant quantity according to the piping length. Collect
the excess refrigerant and charge with the correct amount of refrigerant.
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Refrigerant
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* Check if the additional refrigerant has been charged.
* Calculate the additional refrigerant quantity according to the piping length and
charge the refrigerant.
NOTE:
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In that case, standard additional refrigerant quantity is 1.1 lb (0.5kg) per one time.
Abnormal
Termination
Find out the cause of abnormal termination as shown below. After resolving the
cause of abnormal termination, restart the check refrigerant quantity operation.
(1) Was the No.4 pin of DSW5 ON before the power supply was turned ON?
(2) Are all indoor units ready and waiting, before the No.4 pin of DSW5 is turned ON?
(3) Was the outdoor ambient air temperature within the acceptable range (32 to
109
o
F DB (0 to 43
o
C DB)?
(In some cases, when the connected indoor unit number exceeds the
recommended number and the outdoor ambient air temperature exceeds 95
o
F
DB (35
o
C DB), this check refrigerant quantity operation cannot be performed.)
(4) Is the indoor ambient air temperature within the acceptable range (50 to 90
o
F DB
(10 to 32
o
C DB)?
(5) Is the total indoor units operation capacity ratio 30% (indoor units capacity ratio), or less?
Especially, if the indoor ambient air temperature is 15% or less, the total indoor unit
operation capacity will be 30% (indoor units capacity ratio) or less and if this is the
case, sometimes this refrigerant quantity check cannot be performed.
(6) Is switch No.4 pin of DSW4 (compressor-forced stoppage) OFF?
(1) Refrigerant quantity check operation can be performed using the automatic judgment function after
completing refrigerant charging, but depending on the installation and conditions, the result may be
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with the refrigerant amount calculated in the previous section regardless of this automatic judgment
function result.
< Procedure of Refrigerant Quantity Check Operation >
(a) Reassemble all cover except for the electrical control box cover and service cover of Unit A.
(b) Turn ON the power supply of indoor unit and outdoor unit in the refrigerant system to perform the
refrigerant quantity check operation. (Apply power to the outdoor unit(s) at least 12 hours prior to
operation of the system for preheating of the compressor oil.)
(c) Turn ON the No.4 pin of DSW5 (PCB1).
The 7-segment display will be indicated as follows.
(d) Check the 7-segment display and press PSW1. The outdoor fan and compressor will be in standby
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The outdoor fan and compressor will activate and the 7-segment display will indicate as follows:
(2) Judgment takes 30 to 40 minutes. Refer to the table below for results.
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out the cause of irregularity and perform the refrigerant quantity check again.