Mitsubishi Electric CAHV-P500YB-HPB Service Handbook page 96

[ VII Control ]
Startup sequence rotation
-2- Initial control
When the power is turned on, the initial processing of the microcomputer is given top priority.
During the initial processing, processing of the operation signal is suspended and is resumed after the initial processing is
completed.
(Initial processing involves data processing by the microcomputer and initial setup of the LEV opening. This process takes up
to two minutes.)
During the initial processing "
Initial Control
-3- Compressor frequency
The upper limit of frequency during the first 30 seconds of operation is 48 Hz.
The upper limit of frequency during the first 90 seconds of operation is 60 Hz.
If the water temperature is controlled based on the outlet water temperature (SW3-3 is set to OFF.), for 90 seconds after the
startup, the compressor will be controlled every 30 seconds so that the frequency fluctuation will be kept within ± 5 Hz.
If the water temperature is controlled based on the external water temperature sensor reading or the inlet water temperature
(SW3-3 is set to ON.), for 90 seconds after the startup, the compressor will be controlled every 30 seconds so that the fre-
quency fluctuation will be kept within ± 10 Hz.
(The above does not apply when the high-pressure is suppressed to protect the system or when the defrost operation is in
progress.)
The amount of frequency change is controlled to approximate the target value that are determined based on the temperature
difference between the current and the preset water temperatures.
The minimum operating frequency is 30 Hz.
The maximum frequency will be determined based on the relationship between the water temperature and the outside tem-
perature as well as the ON/OFF status of the Energy-save/Maximum capacity contact.
(The values not on listed in the table are interpolated.)
"Energy-save/Maximum capacity" contact is ON.
− 20 − 15 − 5
35 100 100 100
Water
45 100 100 100
temperature
60 100 100 100
°C
70 100 100 100
HWE15070
" will appear on the LED monitor on the MAIN board.
（Maximum frequency of the compressor Hz）
Outside temp.
°C
0 5 10 15 20 25 30
100 77 65 57 53 49 46
100 82 69 60 55 51 48
100 88 76 69 63 58 53
100 95 84 75 68 62 57
"Energy-save/Maximum capacity" contact is OFF.
− 20 − 15
35 or above
43 35 100 100
Water
44 45 100 100
temperature
49 60 100 100
°C
50 70 100 100
- 89 -
（Maximum frequency of the compressor Hz）
Outside temp.
°C
− 5
0 5 10 15 20 25
100 100 100 91 85 81 76
100 100 100 94 88 83 78
100 100 100 100 93 87 81
100 100 100 100 96 90 83
30 35 or above
71 66
73 67
75 69
77 71
GB