Daikin RXYQ96PYDN Service Manual page 98

SiUS34-801A_b
10.2.5.3Procedure of Adding Refrigerant charging
1. Make sure the following works are complete in accordance with the installation manual.
2. Calculate the additional charging amount using How to calculate the additional refrigerant
3. Open the valve B (See the figure 30. Valves A, and C, and the liquid pipe, suction gas pipe,
VRVIII R-410A Heat Pump 60Hz
When the unit is shipped from the factory, the unit's internal piping is already charged with
refrigerant, so be careful when connecting the charge hose.
After adding the refrigerant, make sure to close the lid of the refrigerant charging port.
The tightening torque for the lid is 8.48 to 10.3 ft · lbf.
See [Shutoff valve operation procedure] in chapter 10.2.5.1 for details on how to handle shutoff
valves.
When finished, or when pausing the refrigerant charging operation, close the valve of the
refrigerant tank immediately.
The refrigerant charge port of this product has an electric expansion valve.
The valve will be closed at end of refrigerant charging. However the valve will be opened on
operation after refrigerant charging (check operation, normal operation, etc.).
If the tank is left with the valve open, the amount of refrigerant properly charged may be off the
point.
Make sure to perform the check operation after installation. Otherwise, the malfunction code
[U3] will be displayed and normal operation cannot be performed.
And the failure of [Check of miswiring] may also cause abnormal operation. Performance may
drop due to the failure of [Judgment of piping length].
Check operation must be performed for each refrigerant piping system.
Checking is impossible if plural systems are being done at once.
The individual problems of indoor units can not be checked.
Check these problems with a test run after the check operation is completed. Refer to Chaper
13.
The check operation cannot be performed in recovery or other service modes.
Piping work
Wiring work
Airtight test
Vacuum drying
Installation work for BS, indoor unit
to be charged in Example of connection on page 529.
HP/LP gas pipe, and equalizer pipe shutoff valves must be left closed), and charged with the
refrigerant of the additional charging amount from the liquid side shutout valve service port.
Charge hose
Measuring
device
R-410A tank (with siphon)
: Field pipings
: Refrigerant flow
High side equalizer pipe shutoff valve
Outside unit A
Gas pipe shutoff valve
Low side equalizer pipe shutoff valve
Liquid pipe shutoff valve
Refrigerant charge port
Valve A
Valve B
Valve C
Test Operation
Outside unit B
: Shutoff valve
Indoor unit
( : Service port)
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