283P362438-3H 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 nished
• 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
B: Manual charge
Step 6a
• Push BS2 once: “888”
• Push BS2 for more than 5 seconds “
01” pressure equalisation
Step 6b
Activate eld setting [2-20]=1
Unit will start manual refrigerant charging operation.
Depending on ambient conditions, the unit will decide to perform autocharge
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 nished
• Fill in the amount on the additional refrigerant charge label
• Go to test run
Continued on next page >>
01_EN_3P362438-3H.indb 28 1/14/2015 10:20:20 AM
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