Hitachi RAS-2-HVNP Service Manual page 241

8. Troubleshooting
41
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- Abnormality indication will appear when the protection device is activated during compressor operation at cooling
(see Note), with the outdoor unit evaporation temperature higher than 55 °C AND the compressor-top temperature
higher than 95 °C.
Outdoor unit evaporation thermistor
90
80
74
70
60
56
Thermistor
50
Resistance
43
(kΩ)
40
33
30
26
20
20
10
0
-15 -10 -5 0 5 10
Ambient Temperature (
Ambient and Evaporating Temp. Thermistor Characteristics
for Outdoor Unit
227
SMGB0079 rev.0 - 01/2013
Cooling Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP and RAS-3HVNC
16 12.5
10
8
5.3
3.6
15 20 25 30 35 40 45 50 55 60
C)
o
Top of compressor thermistor
R25=200kΩ
B=3920K
2.5
Temperature (ºC)
Thermistor resistance characteristics
8