37
COMMISSIONING AND MAINTENANCE
MODEL 355 - 370 - 475 - 485
1
Terminal board panel and pipes cover panel
1
1
MODEL 355 - 370 - 475 - 485
1
Signal panel
2
Terminal board for centralized control (accessory)
3
Wire retainer
4
Power supply connection terminal board
5
Connection terminal board with indoor unit
A
1
2
3
4
5
D
E
B
C
C1
C2
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
L
N
1
Display
2
Signal led
3
Microswitch
1
2
3
•
Proceed as follows to access the filters:
—
check chapter "Electrical connection"
p. 30
The operation of the unit is signed through the LEDs:
On:
correct operation
Off:
lack of communication with the indoor unit
Faults are indicated by a flashing code displayedon the display:
9
During normal operation, the display indicates the frequen-
cy work of the compressor.
Code
Description
1
External unit microprocessor fault
2
Power module fault
4
Communication error between main board and power module
5
Overload power module
6
Wrong supply voltage ot the power module
8
Overheat protection for compressor discharge
Refrigerant loss
Outdoor temperature too high
9
Fan motor malfunction
10
Defrost temperature sensor failure
11
Suction probe fault
12
External air probe fault
13
Discharge temperature sensor failure
15
Communication error between outdoor and indoor unit
16
Lack of refrigerant
17
4-way valve malfunction
18
Deviate from the normal for the compressor
20
Internal unit anti-freeze protection
21
Internal unit overload
23
Overload power module
24
Compressor start error
25
Protection against overcurrent
26
Reset MCU
27
Power supply modul fault
28
Liquid probe circuit A fault
29
Liquid probe circuit b fault
30
Liquid probe circuit C fault
31
Liquid probe circuit D fault
32
Gas probe circuit A fault
33
Gas probe circuit b fault
34
Gas probe circuit C fault
35
Gas probe circuit D fault
36
Gas probe circuit E fault
38
Temperature probe module malfunction
Power failure
39
Heat exchanger probe fault
40
Liquid probe circuit E fault
42
High pressure switch operation
43
Low pressure switch operation
44
High pressure protection
Refrigerant overload
Fan motor malfunction
45
Low pressure protection
Lack of refrigerant
Heat exchanger freezing
Fan motor malfunction
In the presence of operating abnormalities, the unit is secured
and blocked.
9
Safety block can occur randomly.
9
Wait for at least 10 minutes before restarting the unit.
9
If the fault occurs again, an accurate check of the device
components is required. Contact
R
Technical Support
Service.
9
Indoor units with display signal faults with an alphanumeric
code. Consult the matching outdoor unit instruction booklet
for the installer.
Summary of Contents for AARIA MULTI 250 P
Page 39: ......
