Daikin ERQ Series Service Manual page 113

Test Operation
1.2.4.2 Procedure of Adding Refrigerant Charging and Check Operation
Warning
Caution
Note:
<About refrigerant charging>
<About check operation>
1. Make sure the following works are complete in accordance with the installation manual.
2. Calculate the "additional charging amount" using the installation manual.
104
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.
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 AHU.
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 AHU and outdoor units are turned on,
H2P will be lit on and the compressor will not operate.
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 1.2.4.1 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. If the tank is left with the valve open, the amount of refrigerant
which is properly charged may be off the point. More refrigerant may be charged by any
remaining pressure after the machine is stopped.
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".
The check operation cannot be performed in recovery or other service modes.
Piping work
Wiring work
Air tight test
Vacuum drying
Installation work for AHU
ESiEN09-06 A
Test Operation