Mitsubishi Electric CAHV-P500YA-HPB, Service Handbook

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[
VII
Control ]
- 80 -
HWE10060 GB
Startup sequence rotation
-2- Initial control
ΠWhen the power is turned on, the initial processing of the microcomputer is given top priority.
ΠDuring 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.)
Œ During the initial processing ” ” will appear on the LED monitor on the MAIN board.
Initial Control
-3- Compressor frequency
ΠThe upper limit of frequency during the first 30 seconds of operation is 48 Hz.
ΠThe upper limit of frequency during the first 90 seconds of operation is 60 Hz.
ΠIf 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.
Œ
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.)
ΠThe 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.
ΠThe minimum operating frequency is 30 Hz.
ΠThe 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.
（ Maximum frequency of the compressor Hz ）
°C
− 15 − 5 0 5 10 15 20 25 30 35 or above 35 or above
°C
35 100 100 100 77 65 57 53 49 46 43
45 100 100 100 82 69 60 55 51 48 44
60 100 100 100 88 76 69 63 58 53 49
70 100
− 20
100
100
100
100 100 100 95 84 75 68 62 57 50
"Energy-save/Maximum capacity" contact is OFF.
（ Maximum frequency of the compressor Hz ）
− 15 − 5 0 5 10 15 20 25 30
35 100 100 100 100 91 85 81 76 71 66
45 100 100 100 100 94 88 83 78 73 67
60 100 100 100 100 100 93 87 81 75 69
70 100
− 20
100
100
100
100 100 100 100 100 96 90 83 77 71
Water
temperature
°C
Water
temperature
Outside temp.
°C
Outside temp.