English
16
For those doing pipe work
1.
Make sure piping size is correct.
See “
6-1 Selection of piping material and Refrigerant branch-
ing kit
”.
2.
Make sure insulation work is done.
See “
8-2 Pipe insulation
”.
3.
Make sure there is no faulty refrigerant piping.
See “
6. REFRIGERANT PIPING
”.
9.
ADDITIONAL REFRIGERANT
CHARGE AND CHECK OPERATION
The outdoor unit is charged with refrigerant when shipped from the
factory, but depending on the size and length of the piping when
installed, it may require additional charging.
For charging the additional refrigerant, follow the procedure in this
chapter.
And then carry out the check operation.
Warning
Electric Shock Warning
•
Make sure to close the EL. COMPO. BOX (both outdoor unit
and function unit) lid before turning on the power.
•
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.
(Refer to figure 32)
•
Use an insulated rod to operate the push buttons via the EL.
COMPO. BOX’s inspection door.
(Refer to figure 32)
There is a risk of electric shock if you touch any live parts, since
this operation must be performed with the power on.
(Refer to figure 32)
1.
Inspection door
2.
EL. COMPO. BOX
3.
[Service precautions] label (upper)
4.
[Service precautions] label (lower)
5.
Outdoor unit
6.
Function unit
7.
EL. COMPO. BOX lid
8.
LED (H1~8P)
9.
Push button (BS1~5)
10.
Lift the protruding part to open the inspection door.
Caution
•
Make sure to use the protect tool (protective groves and gog-
gles) 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.
•
Due to a danger of liquid hammer, the refrigerant must not be
charged over the allowable maximum amount when charging the
refrigerant.
Note
•
If operation is performed within 12 minutes after the indoor, out-
door and function 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.
•
Be careful when connecting the charge hose. 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.
•
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 expan-
sion 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.
•
See [Shutoff valve operation procedure] in chapter 9-1 for details
on how to handle shutoff valves.
•
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.
•
Make sure to perform the check operation after installation. Oth-
erwise, 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 10)
•
The check operation cannot be performed in recovery or other
service modes.
9-1 Before working
[About the refrigerant tank]
Check whether the tank has a siphon pipe before charging and place
the tank so that the refrigerant is charged in liquid form.
(See the figure below.)
Note
•
Always use the proper refrigerant (R410A). If charged with the
refrigerant containing an improper material, it may cause an
explosion or accident.
•
R410A is a mixed refrigerant, so charging it as a gas will cause
the refrigerant composition to change, which may prevent normal
operation.
[Shutoff valve operation procedure]
When operating the shutoff valve, follow the procedure instructed
below.
Note
•
Do not open the shutoff valve until “
8-3 Checking of device and
installation conditions
” are completed. If the shutoff valve is left
open without turning on the power, it may cause refrigerant to
buildup in the compressor, leading insulation degradation.
•
Be sure to use the correct tools.
The shutoff valve is not a back-seat type. If forced it to open, it
might break the valve body.
(Refer to figure 33)
•
When using a service port, use the charge hose.
•
After tightening the cap, make sure no refrigerant gas is leaking.
With siphon pipe
Other tanks
Stand the tank upright and charge.
(The siphon pipe goes all the way inside,
so the tank does not need be put
upside-down charge in liquid form.)
Stand the tank upside-down and charge.
01_EN_3P201178-10P.fm Page 16 Wednesday, September 2, 2009 11:10 AM
