14
English
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 BS and indoor unit.
•
When opening the front panel, make sure to take caution to the fan rota-
tion during the working.
After the outside unit stops operating, the fan may keep rotation for a while.
NOTE
•
If operation is performed within 12 minutes after the BS, indoor and
outside 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 start-
ing 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 refrig-
erant 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, nomal 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. Other-
wise, the malfunction code “U3” will be displayed and normal opera-
tion 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 ser-
vice 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.
Outside 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-bord (A1) of outside 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 open-
ing or closeing the valves, follow the procedure.
•
During Automatic refrigerant charging operation, the system will
select charging mode (cooling mode or heating mode) by the tem-
perature 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.
Outside unit
12.
To BS, indoor unit
13.
Field pipings
14.
Refrigerant flow when charging
15.
Shutoff valve
16.
Service port
[Automatic refirgerant charging operation procedure]
NOTE
•
The marks of LED mean as follows.
h
: OFF
i
: ON
j
: Blinking
∗
: OFF, ON or Brinking
(1) Open the liquid pipe, suction gas pipe and HP/LP gas pipe shutoff
valves. (The valve A~C must be closed. See figure 30.)
(2)
•
Close the EL. COMPO. BOX (1) lid and all front panel except on the
EL. COMPO. BOX (1) side. (*1) And turn the power to the outdoor
unit and all connected BS, indoor units. (*2)
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
