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3P362438-5N English
14 .3 . Method for adding refrigerant
14 .3 .1 . Flow chart
Step 1
Calculate additional refrigerant charge amount: R (lbs. (kg))
B
A
C
Step 2+3
•
Close valves C and A
•
Open valve B to the liquid line
• Execute pre-charging amount: Q (lbs. (kg))
•
Disconnect the manifold from the suction gas line and the high/low pressure
gas line
R=Q
R<Q
R>Q
Step 4a
•
Close valve B
• Charging is finished
•
Fill in the amount on the additional refrigerant
charge label
•
Go to test run
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
Step 4b
Close valve B
R>Q
Step 5
Open all outdoor unit stop valves
Step 6
Proceed with automatic or manual charge
A: Automatic charge
(Not applicable in DOAS system)
B: Manual charge
Step 6a
•
Push BS2 once: “
888
”
•
Push BS2 for more than 5 seconds “
01
” pressure equalisation
Step 6b
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
Depending on ambient conditions, the unit will decide to perform automatic
charging operation in heating or cooling mode.
•
Open valve A
•
Charge remaining amount of refrigerant P (lbs. (kg))
R=Q+P
•
Close valve A
•
Push BS3 to stop manual charging
• Charging is finished
•
Fill in the amount on the additional refrigerant charge label
•
Go to test run
Continued on next page >>
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12/11/2019 11:24:22 AM