Daikin VRV IV+ Installation And Operation Manual page 27

14.4.4 To charge refrigerant: Flow chart
For more information, see "To charge
Pre-charging refrigerant
Step 1
Calculate additional refrigerant charge amount: R (kg)
Step 2+3
• Open valves C, D and B to the liquid and equalising line
• Charge the equalising line to maximally 0.05 MPa, then close valve C and
disconnect its connection to the manifold. Continue pre-charging through
the liquid line only
• Execute pre-charging amount: Q (kg)
R=Q
Step 4a
• Close valves D and B
• Charging is finished
• Fill in the amount on the additional
refrigerant charge label
• Input the additional refrigerant amount via
setting [2-14]
• Go to test run
Charging refrigerant
<< Continuation of previous page
Step 5
• Connect valve A to the refrigerant charge port (d)
• Open all outdoor unit stop valves
Step 6
Proceed with automatic or manual charge
Step 6a
• Push 1x BS2: "888"
• Push BS2 for more than 5 seconds "t01" pressure equalisation
Depending on ambient conditions, the unit will decide to perform autocharge
operation in heating or cooling mode.
Continued on next page >>
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546220-1C – 2020.10
refrigerant" [ 4 28].
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
R>Q
Automatic charge
p < p >
A B
N2 R410A
R<Q
Step 4b
Close valves D and B
p < p >
A
R410A
Step 6b
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
• Open valve A
• Charge remaining amount of refrigerant P (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
• Input the additional refrigerant amount via setting [2-14]
• Go to test run
14 Piping installation
D
C
R>Q
Continued on next page >>
d
Manual charge
Installation and operation manual
27