Daikin VRV III REMQ120PBTJ, Engineering Data

Page: 85 / 130

EDUS391004-N Installation
Installation of Outdoor Units 85
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 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 Branch Selector 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.
NOTE
• 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 below.
• 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 8.48 to 10.3 ft · lbf.
• 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.
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 13)
• The check operation cannot be performed in recovery or other
service modes.
11-2-1 Procedure of Adding Refrigerant charging
1.
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 BS, indoor unit
2.
Calculate the “additional charging amount” using “How to calculate
the additional refrigerant to be charged” in
“6-5 Example of
connection” .
3.
Open the valve B ( See the figure 29 . The valve A, C and the liquid
pipe, suction gas pipe, HP/LP gas pipe, equalizer pipe shutoff
valves must be left closed), and charge the refrigerant of the
“additional charging amount” from the liquid side shutout valve
service port.
(Refer to figure 29)
1. Measuring device
2. R410A tank (with siphon)
3. Charge hose
4. Refrigerant charge port
5. HP/LP gas pipe shutoff valve
6. Suction gas shutoff valve
7. Liquid pipe shutoff valve
8. Valve A
9. Valve B
10. Valve C
11. Outdoor unit
12. To BS, indoor unit
13. Field pipings
14. Refrigerant flow
15. Shutoff valve
16. Service port
4.
If the “additional charging amount” was charged fully, close the
valve B and go to step 6.
If the “additional charging amount” was not charged fully, close the
valve B and go to step 5.
5.
Perform the refrigerant charging following [Automatic refrigerant
charging operation procedure] as shown below. And charge the
remaining refrigerant of the “additional charging amount”.
NOTE
• For performing the automatic refrigerant charging operation, the
push button on the PC-board (A1) of outdoor unit are used. (See
figure 28.)
And the refrigerant are charged from the refrigerant charge port via
the valve A. (See figure 30.) For operating the push button and
opening or closing the valves, follow the procedure.
• During Automatic refrigerant charging operation, the system will
select charging mode (cooling mode or heating mode) by the
temperature condition as follows.
When charging in cooling mode, the system will stop operation
when the required amount of refrigerant is charged.
During charging in heating mode, a person must manually close
valve A and stop operation.
Beforehand, check the remaining refrigerant that is needed to
charge based on the “additional charging amount” in step 2 and
the charged amount in step 3.
• The refrigerant will be charged about 66 lb in one hour at outdoor
temp. 86°F DB (about 26 lb at outdoor temp. 32°F DB).
• During Automatic refrigerant charging operation, you can stop the
operation forcedly by pushing MODE button (BS1).
(Refer to figure 30)
1. Measuring device
2. R410A tank (with siphon)
3. Charge hose
4. Refrigerant charge port
5. HP/LP gas pipe shutoff valve
6. Suction pipe shutoff valve
7. Liquid pipe shutoff valve
8. Valve A
9. Valve B
10. Valve C
11. Outdoor unit
12. To BS, indoor unit
13. Field pipings
14. Refrigerant flow when charging
15. Shutoff valve
16. Service port
H1P H2P H3P H4P H5P H6P H7P
h h i h h h h
Outdoor temp. : 32˚F DB ~ 109˚F DB
Indoor temp. :
50˚F DB ~ 90˚F DB
Less than above range
Cooling mode
Heating mode
3P215731-12R