Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Service Handbook

Page: 110 / 204

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(17) Emergency response operating mode
The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when the
compressors (No. 1, No. 2) break down, making it possible to carry out a trouble reset using the remote control.
1) Starting the Emergency Operation Mode
1
Trouble occurs (Display the trouble code root and trouble code on the remote control).
2
Carry out trouble reset with the remote control.
3 If the trouble indicted in 1 above is of the kind that permits emergency operation (see the table below), initiate a
retry operation.
If the trouble indicated in
1
above is of the kind where emergency operation is impossible (see the table below),
restart operation after carrying out the previous trouble reset (without entering the emergency operation mode).
4
If the same trouble is detected again during the retry operation in
3
above, carry out trouble reset once more
with the remote control, then try emergency operation starting corresponding to the contents of the trouble.
Table Emergency Operation Mode Patterns and Trouble Codes for which Emergency Operation is Possible or Impossible
Codes for which emergency operation is
possible.
Serial transmission trouble 0403
VDC sensor/circuit trouble 4200
Breaking of overcurrent 4210
Bus voltage trouble 4220
Radiator panel overheat
protection
4230
Overcurrent protection 4240
Cooling fan trouble 4260
Thermal sensor trouble
(Radiator panel)
5110
IDC sensor/circuit trouble 5301
Overcurrent protection
Error codes other than those at right.
Emergency Mode
Pattern
When a No. 1
Compressor Failure
Occurs
When No. 2
Compressor Failure
Occurs
Constant capacity
unit
Error (stop)
Trouble Codes for which
Emergency Operation is
Impossible
Trouble codes other than
those at left.
(a)High pressure/ low-
pressure pressure
error
1302
(b)Reverse phase error
4103
(c) Communication error
No communication with
variable capacity unit
(d)Constant capacity unit
power-off and LEV2
open
(e)Oil equalization circuit
irregularity 1559
Action
Emergency Operation with the
No. 2 and No. 3 Compressor
* After the retry operation, even if
there is a different trouble code
detected within <Inverter
Trouble> at left, press the button
and after resetting, start the unit
by emergency operation.
[Example]
4250
→
Reset
→
Retry
→
4240
→
Reset
→
Emergency
operation
Emergency Operation with the
No. 1 and No. 3 Compressor
Emergency response operation
with the variable capacity unit only
(No. 1 and No. 2 compressor).
Failed Compressor External temp. (TH6) Model 600 - 750 Notes
No.1 TH6 20
°
C (cooling) or heating
×
60 ~ 70 % No.2 + No.3 Compressors on
TH6 < 20
°
C (cooling)
×
45 ~ 55 % No.2 Compressor only
No.2 TH6 20
°
C (cooling) or heating
×
65 ~ 75 % No.1 + No.3 Compressors on
TH6 < 20
°
C (cooling)
×
45 ~ 55 % No.1 Compressor only
No. 3 Don’t care
×
80 ~ 90 % No.1 + No.2 Compressors on
Caution
During emergency operation, only
×
marked percentage of indoor units can be operated during emergency operation.
In case, more than
×
marked percentage of indoor units are operated, over than the percentage of indoor units
would be on the stand-by mode.