Hitachi RAC-50YH7, Service Manual

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Notes:
1. Condition for entering Cool Dashed Mode: When fan is set at ‘Hi’ or ‘Auto’ Mode or when the fan speed is changed to ‘Hi’ or ‘Auto’ during cooling operation and temperature difference
between indoor temperature and setting tempe SHIFTC has a corresponding compressor rpm (calculated value in Table 2) larger than CMAX.
2. Cool Dashed will release when: (i) a maximum 25 minutes is elapsed after Cool Dashed Mode was started; (ii) room temperature less than cooling setting tempe SHIFTC - 1°C,
then maximum Cool Dashed time will be revised to 20 minutes; (iii) Thermo OFF (the compressor does not go through the steady speed period but it starts by fuzzy control).
3. During Cool Dashed operation, Thermo OFF temperature = setting tempe SHIFTC - 3°C. After Thermo OFF, operation continues in fuzzy control.
4. The compressor minimum ‘ON’ time and ‘OFF’ time is 3 minutes.
5. During normal cooling mode, CMAX will be maintained until 60 minutes when room temperature less than CLMXTP and no time constrain when room temperature is CLMXTP and above.
6. If the fan speed set to ‘Med’ mode by remote control, maximum compressor rpm = CJKMAX.
7. If the fan speed set to ‘Lo’ mode by remote control, maximum compressor rpm = CBEMAX.
8. If the fan speed set to ‘Silent’ mode by remote control, maximum compressor rpm = CSZMAX.
9. During Cool Dashed, when room temperature reaches setting temperature - 1°C, compressor rpm = actual rpm x DWNRATEC.
Table 2 TCMAX
1.66 2300
2.00 2300
2.33 2300
2.66 2800
3.00 2800
3.33 2800
3.66 3300
4.00 3300
4.33 3300
4.66 3800
5.00 3800
6.00 4300
6.33 4300
6.66 4800
7.00 4800
7.33 4800
7.66 5300
8.00 5300
8.33 5300
8.66 5800
9.00 5800
9.33 5800
9.66 6300
10.00 6300
10.33 6300
10.66 6800
11.00 6800
Temperature
difference
Calculated compressor
rpm