18 | Piping installation
Installer and user reference guide
98
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
Charging refrigerant
Step 5
Proceed with manual charge
Step 6
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
Step 7
• Open valve A
• Charge remaining amount of refrigerant P (kg)
R=Q+P
Step 8
• 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
Step 4
• Connect valve A to the refrigerant charge port (d)
• Open all outdoor unit stop valves
R>Q
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18.4.5 To charge refrigerant
Follow the steps as described below.
Pre-charging refrigerant
1 Calculate the additional amount of refrigerant to be added using the formula
mentioned in "To determine the additional refrigerant amount"[495].
2 The first 10 kg of additional refrigerant can be pre-charged without outdoor
unit operation.
If Then
The additional refrigerant amount is
smaller than 10kg
Perform steps 2+3.
The additional refrigerant charge is
larger than 10 kg
Perform steps 2~8.
3 Pre-charging can be done without compressor operation, by connecting the
refrigerant bottle to the service ports of the liquid and equalising stop valves
(open valve B). Make sure that valve A and all outdoor unit stop valves are
closed.
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