Daikin VRVIII-Q Series Installation Manual Download

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11-2 Procedure of Adding Refrigerant charging

and check operation

WARNING

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.

CAUTION

• Make sure to use the protect tool (protective groves and gog-

gles) 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 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.

Note

•

If operation is performed within 12 minutes after the indoor 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 N·m.

•

See [Shutoff valve operation procedure] in chapter 11-1 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 prop-
erly 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”.

•

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 13)

•

The check operation cannot be performed in recovery or other
service modes.

<About re-charging of refrigerant>

•

When sizes and length of field pipings are certain, figure out the
re-charging amount of refrigerant by calculation method of refrig-
erant charging amount on the installation manual, then charge
according to “6-5. Example of connection”. (Check operation time
shall be shortened.)
Although there supposed to be no re-charging amount required
by calculation, it still occasionally needed to be re-charged
depending on the installation circumstances, etc.

•

In case of long pipings, but sizes and length of field pipings are not
certain, indication for re-charging of refrigerant is shown by out-
door unit LED and (for BRC1A52) on the remote controller.

Please see the remote controller indication list at “11-2 Procedure
of Adding Refrigerant charging and check operation”.

<Notes on check operation>

•

If operated within approx. 12 min. after turning on the indoor, BS
and outdoor units, H2P will light-on and compressor shall not start
its operation.
Please start the operation after confirming the proper indication of
LED according to “Check operation”.

•

For multi-connecting outdoor unit systems, operation of push-but-
tons and checks of LED indications shall be done at the parent
unit.
Outdoor unit to which indoor unit connection wires are connected
is the parent unit.

•

It may takes approx. 10 min. from turning on the operation till the
compressor actually starts operating. This is to equalize the
refrigerant condition, not a sign of malfunction of the system.

•

Indoor unit cannot be checked individually.
Please check at normal operation by remote controller after this
check operation.

•

Do not test operate while working on the indoor units.
Not only outdoor units but also indoor units are operated at the
check operation.

•

Please close all the outside panels except the one for electrical
components box while working.

•

Re-charging according to a check operation shall be done when
outdoor temperature is 0°C or higher, and indoor temperature is
10°C or higher.
If outdoor temperature is too low, it drops the temperature of
refrigerant tank and may not be able to charge.
If indoor temperature is too low, it may cause an excess of charg-
ing.

•

Close the outside panels except when operating the push-but-
tons, or installing the charging tube.

•

Sounds of refrigerant flow, activating of solenoid valves, etc. could
be from time to time louder during operation.

Make sure the following works are complete in accordance with
the installation manual.

Piping work

Wiring work

Air tight test

Vacuum drying

Installation work for indoor unit

Calculate the “additional charging amount” from the following.

additional