8 Troubleshooting
Installation and operation manual
24
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
7.3.2
To perform a test run (7-LEDs display)
1
Make sure all field settings you want are set; see
"6.1 Making
field settings" on page 20
.
2
Turn ON the power to the outdoor unit and the connected
indoor units.
3
Turn ON the (remote) operation switch of the outdoor unit.
4
Check the sight glass of the outdoor unit. If the refrigerant is
NOT in sealing state, charge extra refrigerant, but do NOT
exceed 10% of the determined additional refrigerant amount
(see
"5.5.2 To determine the additional refrigerant amount" on
page 15
).
b
a
c
d
O
Sealing state (= sufficient refrigerant)
X
Insufficient refrigerant
a
Sight glass
b
Full of liquid
c
A little foam in the liquid
d
A lot of foam in the liquid
5
Check if the indoor unit blows cold air, and the room/showcase
temperature decreases.
6
Turn OFF the (remote) operation switch of the outdoor unit.
CAUTION
Do NOT turn OFF power by disconnecting the power
supply directly.
Possible consequence:
▪ The auto restart function of the unit might automatically
resume
operation
after
the
power
supply
is
reconnected.
▪ Compressor malfunction.
7
Check the test operation results on the outdoor unit 7‑LEDs
display.
Completion
Description
Normal
completion
Abnormal
completion
Refer to
"7.3.3 Correcting after abnormal
completion of the test run" on page 24
to take
actions for correcting the abnormality. When
the test operation is fully completed, normal
operation is possible.
7.3.3
Correcting after abnormal completion of
the test run
The test operation is only completed if no malfunction occurs. In
case of a malfunction, perform correcting actions as explained in the
error code table (see Error codes: Overview). Carry out the test
operation again and confirm that the abnormality is properly
corrected.
INFORMATION
When a malfunction occurs, X3M outputs a caution (C/C1)
or warning (C/W1) signal, and the H2P LED on the main
PCB lights up.
7.3.4
Operating the unit
Once the unit is installed and test operation of outdoor unit and
indoor units is finished, the operation of the system can start.
8
Troubleshooting
8.1
Solving problems based on error
codes
INFORMATION
When a malfunction occurs, X3M outputs a caution (C/C1)
or warning (C/W1) signal, and the H2P LED on the main
PCB lights up.
You can display the error codes of the 3 latest malfunctions by using
the push buttons and 7‑LEDs display (see
"6.1.3 Field setting
components" on page 20
). Error codes consist of 2 characters
(example: E3).
After solving the problem, reset the malfunction by turning OFF and
ON the operation switch, and retry operation.
8.1.1
To display the error codes of the latest
malfunctions
#
Action
Display
1
Start from the default
situation.
2
Select mode 1.
BS1
[1×]
3
Select a malfunction.
("X×" depends on the
setting that you want
to select.)
BS2
[X×]
Possible malfunctions:
[1‑14] Latest malfunction:
[1‑15] 2nd last malfunction:
[1‑16] 3rd last malfunction:
4
Display the
first
character
of the error
code.
BS3
[1×]
Possible characters:
E:
H:
F:
J:
L:
P:
U:
5
Display the
second
character
of the error
code.
BS2
[1×]
Possible characters:
1:
2:
3:
4:
5:
6:
7:
8:
9:
A:
C:
6
Quit mode 1.
BS1
[1×]
Summary of Contents for LRMEQ3BY1
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