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14
TROUBLESHOOTING
You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. board of the outdoor unit in addition to
using the check codes displayed on the wired remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check codes displayed on the wired remote
controller of the indoor unit are described in the Installation Manual of the indoor unit.
Verifying current abnormal status
1.
Check that DIP switch SW803 is set to OFF.
2.
Jot down the states of LED800 to LED804. (Display mode 1)
3.
Press SW800 for at least 1 second. The LED status changes to display mode 2.
4.
Check the code whose display mode 1 equals the LED states jotted down and display mode 2 equals the current
flashing status of LED800 to LED804 from the following table to identify the cause.
Verifying an abnormal state in the past although the abnormal state no longer occurs
1.
Set bit 1 of DIP switch SW803 to ON.
2.
Jot down the states of LED800 to LED804. (Display mode 1)
3.
Press SW800 for at least 1 second. The LED status changes to display mode 2.
4.
Find an error whose display mode 1 equals the LED states jotted down and display mode 2 equals the current
flashing states of LED800 to LED804 from the following table to identify the error.
• An outside air temperature (TO) sensor error can be checked only while it occurs.
EN-175
15
APPENDIX
[1] Existing piping
Work instructions
The existing R22 and R407C piping can be reused for
our digital inverter R32 product installations.
WARNING
Confirming the existence of scratches or dents on
the existing pipes and confirming the reliability of
the pipe strength are conventionally referred to the
local site.
If the specified conditions can be cleared, it is
possible to update existing R22 and R407C pipes to
those for R32 models.
Basic conditions needed to reuse existing
pipes
Check and observe the presence of three conditions in
the refrigerant piping works.
1.
Dry (There is no moisture inside of the pipes.)
2.
Clean (There is no dust inside of the pipes.)
3.
Tight (There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should not
be reused as they are. Clean the existing pipes or
exchange them with new pipes.
1.
When a scratch or dent is heavy, be sure to use new
pipes for the refrigerant piping works.
2.
When the existing pipe thickness is thinner than the
specified "Pipe diameter and thickness," be sure to
use new pipes for the refrigerant piping works.
• The operating pressure of R32 is high. If there is a
scratch or dent on the pipe or a thinner pipe is
used, the pressure strength may be inadequate,
which may cause the pipe to break in the worst
case.
- 88 -
* Pipe diameter and thickness (mm)
Reference
Wall thickness
outside diameter
Material
(mm)
(mm)
6.4
0.8
–
9.5
0.8
–
12.7
0.8
–
15.9
1.0
–
• In case the pipe diameter is Ø12.7 mm or less
and the thickness is less than 0.7 mm, be sure to
use new pipes for the refrigerant piping works.
3.
When the outdoor unit was left with the pipes
disconnected, or the gas leaked from the pipes and
the pipes were not repaired and refilled.
• There is the possibility of rain water or air,
including moisture, entering the pipe.
4.
When refrigerant cannot be recovered using a
refrigerant recovery unit.
• There is the possibility that a large quantity of dirty
oil or moisture remains inside the pipes.
5.
When a commercially available dryer is attached to
the existing pipes.
• There is the possibility that copper green rust has
been generated.
6.
When the existing air conditioner is removed after
refrigerant has been recovered.
Check if the oil is judged to be clearly different from
normal oil.
• The refrigerator oil is copper rust green in color:
There is the possibility that moisture has mixed
with the oil and rust has been generated inside
the pipe.
• There is discolored oil, a large quantity of residue,
or a bad smell.
• A large quantity of shiny metal dust or other wear
residue can be seen in the refrigerant oil.
7.
When the air conditioner has a history of the
compressor failing and being replaced.
• When discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture
of foreign matter is observed, trouble will occur.
EN-176
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