Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 106

[ VII Control ]
Startup seq uence 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 (SW6-3 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 between -8 and
+3 Hz.
If the water temperature is controlled based on the external water temperature sensor reading or the inlet water temperature
(SW6-3 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 between -8 and +3 Hz.
(The above does not apply when the high-pressure and low-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 21 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.
- 25 - 20 - 10
Tw
35 40 100 120
Water
45 40 100 120
temperature
60 40 100 120
°C
70 40 100 120
HWE22020
" will appear on the LED monitor on the MAIN board.
（Maximum frequency of the compressor Hz）
Outside temp.
°C
0 5 7 10 15 20 25
120 110 106 101 86 76 74
120 112 108 108 92 77 75
120 120 120 113 106 79 77
120 120 120 120 113 107 80
"Energy-save/Maximum capacity" contact is OFF.
- 25
30 35 or above Tw
70 70 35 40
Water
72 71 45 40
temperature
75 73 60 40
°C
77 74 70 40
- 97 -
（Maximum frequency of the compressor Hz）
Outside temp.
°C
- 20 - 10
0 5 7 10 15
100 120 120 120 120 120 120
100 120 120 120 120 120 120
100 120 120 120 120 120 120
100 120 120 120 120 120 120
20 25 30 35 or above
120 120 120 120
120 120 120 120
120 120 120 120
120 120 120 120
GB