Daikin VRV III REYQ8PY1 Service Manual page 169

Test Operation
1.2.5.2 Procedure of Adding Refrigerant Charging and Check Operation
Warning
Caution
Note:
158
Electric Shock Warning
Make sure to close the EL. COMPO. BOX lid before turning on the power when performing
the refrigerant charging operation.
Perform the setting on the PC board (A1P) of the outdoor unit and check the LED display
after the power is on via the inspection door which is in the EL. COMPO. BOX lid.
EL. COMPO. BOX
Use an insulated rod to operate the push buttons via the EL. COMPO. BOX's inspection door.
There is a risk of electric shock if you touch any live parts, since this operation must be
performed with the power on.
Make sure to use the protect tool (protective groves and goggles) when charging the
refrigerant.
Due to a danger of liquid hammer, the refrigerant must not be charged over the allowable
maximum amount when charging the refrigerant.
Do not perform the refrigerant charging operation under working for the BS and indoor unit.
When opening the front panel, make sure to take caution to the fan rotation during the
working.
After the outdoor unit stops operating, the fan may keep rotation for a while.
If operation is performed within 12 minutes after the BS, indoor and outdoor units are turned
on, H2P will be lit on and the compressor will not operate.
Check the LED display indicate as shown [Display of normal system] in chapter 1.2.5.2.1.
In order to ensure uniform refrigerant distribution, it may take up to around 10 minutes for the
compressor to start up after the unit starting operating. This is not a malfunction.
The refrigerant charge port is connected to the piping inside the unit.
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 11.5 to 13.9 Nm.
See [Shutoff valve operation procedure] in chapter 1.2.5.1 for details on how to handle
shutoff valves.
When done or when pausing the refrigerant charging operation, close the valve of the
refrigerant tank immediately.
The refrigerant charge port of this product have 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 which is 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.
About these problems check by test run after the check operation is completed. (See
chapter 1.2.6)
The check operation cannot be performed in recovery or other service modes.
Lift the protruding part to
open the inspection door
Inspection door
EL. COMPO. BOX lid
LED
(H1~8P)
Push button(BS1~5)
Si37-701
Inspection door
Test Operation