Method For Adding Refrigerant - Daikin VRV IV REYQ72TATJ Series Installation Manual

14 .3 . Method for adding refrigerant

14 .3 . 1 . Flow chart
Step 1
Calculate additional refrigerant charge amount: R (lbs. (kg))
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
Step 4a
• Close valve B
• Charging is finished
• Fill in the amount on the additional refrigerant
charge label
• Go to test run
Step 6a
• Push BS2 once: "888"
• Push BS2 for more than 5 seconds " 01" pressure equalisation
Depending on ambient conditions, the unit will decide to perform automatic
charging operation in heating or cooling mode.
Continued on next page >>
3P362438-5N English
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
A: Automatic charge
(Not applicable in DOAS system)
A
B
C
R<Q
Step 4b
Close valve B
Step 5
Open all outdoor unit stop valves
Step 6
Proceed with automatic or manual charge
Step 6b
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
• 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
R>Q
R>Q
B: Manual charge
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