14 Piping installation
Installation and operation manual
23
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P546223-1C – 2021.11
14.4.4
To charge refrigerant: Flow chart
"14.4.5 To charge refrigerant"
Pre-charging refrigerant
Step 1
Calculate additional refrigerant charge amount: R (kg)
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
Step 2
• Open valves C and B to the liquid line
• Execute pre-charging amount: Q (kg)
Step 3a
• Close valves C and B
• Charging is finished
• Fill in the amount on the additional
refrigerant charge label
• Go to test run
Step 3b
Close valves C and B
R=Q
R>Q
R<Q
Continued on next page >>
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R410A
N2
C
A
B
