Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 49

Symbol explanation
Symbol Explanation
ACCT1
AC current sensor
ACCT2
DCL DC reactor
F01
F02
F03
F04
Fuse
F05
F06
F401
F402
MAIN BOX
LEV1, 3
Electronic expansion valve (Main circuit)
and
LEV2
Electronic expansion valve (Injection)
SUB BOX
MF1, 2 Fan motor
MS Compressor motor
PSH1 High pressure sensor
PSL1 Low pressure sensor
R1, R2 Electrical resistance
21S4a
4-way valve
21S4b
THL DC reactor temperature
Z22, 24, 25 Function setting connector
63H1 High pressure switch
72C Electromagnetic relay (Inverter main circuit)
TH1~4,
9~11, 21
MAIN BOX Thermistor
TH14, 15
Field-
<ELB1> Earth leakage breaker
supplied
Inside the control box (front view)
Fan
Rec board
Inverter board
R1
R2
Noise filter
Inverter board
TB1
Control terminal block 2
Display setting
Control board display
Preset water temperature
Current water temperature *2
High pressure/Low pressure
*1 Select an item to be displayed by setting the switches.
*2 The current water temperature will be displayed according to the selection on the preset
water temperature display option.
*3 If an error occurs, a 4-digit error code, from a list of error codes in the table at right will
blink on the board and remote controller display. ([Error code] and [Error source address]
appear alternately on the remote controller display.)
*4 Definition of symbols in the "Error reset" column
... Errors that can be reset regardless of the switch settings
... Errors that can be reset if the remote reset setting on the unit is set to "Enable"
(factory setting)
Errors that cannot be reset if the remote reset setting on the unit is set to "Disable"
... Errors that cannot be reset
... Errors that will be automatically reset after the cause of the error is removed
*5 Power failure can be detected only when the switch setting "Automatic recovery after
power failure" on the unit is set to "Disable." (The default setting is "Enable.")
*6 Depending on the system configuration, the unit may come to an abnormal stop when the
communication error lasts for 10 minutes or longer. In this case, the error needs to be
reset by setting either SWS1 on the unit (PCB) or remote operation switch.
*7 This error code will appear when multiple errors occur that are reset in different ways and
when one or more of these errors have not been reset.
This error can be reset by turning off and then back on the unit's power.
*8 Remove the cause of the error before resetting the error.
Resuming operation without removing the cause may burst the heat exchanger.
*9 [Error code] and [Detail code] appear alternately.
Refer to the Installation Manual for detail codes.
Control board
IO
board
Transmission
power board
Control terminal block 1
Control board SW setting *1
SW6-5: ON SW6-6: OFF
SW6-5: ON SW6-6: ON
SW5-10: OFF SW6-8: OFF
SW6-5: OFF SW6-9: OFF
SW6-6: OFF SW6-10: OFF
SW6-7: OFF
Error Codes
Error code
No.
(PCB *3)
A000
1 Unreset errors
4106
2 Power failure
A-P0
1102
3 Discharge temperature fault
AC61
1502
4 Compressor flooding
AdSH
2501
5 Water supply cutoff (Flow switch)
AFSA
1302
6 High pressure fault
AHP1
4102
7 Open phase
A471
0403
8 Serial communication error
1103
9 Shell temperature fault
1503
10 Heat exchanger freeze up
1505
11 Vacuum protection fault
4102
12 Open phase (T phase)
4106
13 Power supply fault
4115
14 Power supply frequency fault
4220 4225
, ,
15 Inverter bus voltage fault
4226
4230 4235
,
16 Inverter overheat protection fault
4236
4240 4245
,
17 Inverter overload protection fault
4246
4250 4255
,
18 IPM error (inclusive)/overcurrent relay trip *9
4256
5101
19 Discharge temperature thermistor error (TH1)
Compressor inlet temperature thermistor error
5102
20
(TH2)
5103
21 Shell temperature thermistor error (TH3)
Air-side heat exchanger refrigerant
5104
22
temperature thermistor error (TH4)
5109
23 Outside temperature thermistor error (TH9)
Inlet water temperature thermistor error
5116
24
(TH10)
Outlet water temperature thermistor error
5111
25
(TH11)
External water temperature thermistor error
5114 5115
26
,
(TH14, TH15)
Water-side heat exchanger refrigerant
5121
27
temperature thermistor error (TH21)
5201
28 High-pressure sensor fault
5202
29 Low-pressure sensor fault
5301 5305
30 ACCT•DCCT sensor fault/Circuit fault
,
6500
31 Communication error
6600
6603
Communication error
6606
32
(Simple multiple unit control)
6607
*6
6608
*6
6830
33 Address overlap
6831
34 Remote controller signal reception error 1
6832
35 Remote controller signal transmission error
6834
36 Remote controller signal reception error 2
7102
37 Incorrect setting of No.-of-connected-unit
7105
38 Address setting error
7113 7117
39 Model setting error
,
7130
40 Incompatible combination of units
49
Error reset *4
Unit side
Error type (PCB)
SWS1
*7
*5
*8
*9
*9
*9
( )
( )
( )
*9
Remote
controller
Operation
SW
( )
( )
( )