251
LD
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
definition
Failure description Remarks
33-0 21
EEPROM
(AT24C04)
failure
EEPROM communication failure
Once
confirmation,
Unresumable
33-1 21 EEPROM data check failure(model code, check sum etc.)
33-2 21
EEPROM data check failure(data beyond limit, reverse sequence
etc.)
34-0 22
Discharging temp. over
heat protection (Tdi)
Tdi / Td1≥130°C (E). Stop and alarm if it is over the set value for 2
secs continuously at interval of 25msec.
Resume automatically if the discharging temp. is 10 degree lower
than the alarm condition after stopped for 3 mins.
Four times an hour, failure confirmed.
Once
confirmation,
Unresumable
35-0 23 4WV reversing failure
Reversion is successful if the following condition is satisfied for
continuous 10 secs after 4WV is electrified for 3 mins.
If not satisfied, protect and stop.
(Tao>-10°C,
β
=0.60; Tao≤-10°C,
β
=0.40)
* 4WV OFF restart after 3 mins
* Thermo. OFF for 2 times continuously, Error and stop
Once
confirmation,
Unresumable
35-1 23 4WV reversing failure
Master unit checks heating mode operation. If some slave units’
4WV still can’t electrified after starting up for 20 mins, failure 35-1
is shown.
36 24
Oil temp. sub-cooling
protection (Toili)
Normally in operation (excluding startup, deforest, oil return, remains,
stop), detect Toil < CT+10°C for continuous 5 mins, stop and alarm.
Resume automatically after 170 secs; Lock if alarming three times an
hour.
The same as Td sub-cooling protection
Once
confirmation,
Unresumable
& this outdoor compressor runs normally
& Tdp-Tdef1≥10°C
Tdp-Tdef2≥10°C
Pd-Ps≥
β
MPa
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