Hitachi RAS-70YH7 Service Manual page 47

Notes:
(1) Condition for entering into Hot Dashed mode. When fan set to "Hi" or "Auto mode" and i) Indoor temperature is lower than 18°C, and ii) outdoor temperature is lower than
10°C, and iii) Temperature difference between indoor temperature and set temperature has a corresponding compressor rpm (calculated value in Table 3) larger than WMAX.
(2) Hot Dashed will release when i) Room temperature has achieved the set temperature + SFTDSW. ii) Thermo off.
(3) During Hot Dashed operation, thermo off temperature is set temperature (with shift value) +3°C. After thermo off, operation continue in Fuzzy control mode.
(4) Compressor minimum "ON" time and "OFF" time is 3 minutes.
(5) During normal heating mode, compressor maximum rpm WMAX will maintain for 120 minutes if indoor temperature is higher than 18°C. No time limit constrain if indoor
temperature is lower than 18°C and outdoor temperature is lower than 2°C.
(6) During Hotkeep or Defrost mode, indoor operation lamp will blink at interval of 3 seconds "ON" and 0.5 second "OFF".
(7) When heating mode starts, it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNEOF + 0.33°C.
(8) When fan is set to "Med" or "Lo", compressor rpm will be limited to WBEMAX.
(9) In "Ultra-Lo" fan mode, if indoor temperature is lower than 18°C, indoor fan will stop. If indoor temperature is higher than 18°C + 0.33°C, fan will continue in "Ultra-Lo" mode.
During Hotkeep or Defrost mode, fan will continue in "Ultra-Lo" mode.
(10) During Hot Dashed or outdoor temperature is lower than –5°C, compressor rpm is WMAX2.
(11) During Hot Dashed, when room temperature reaches set temperature + SFTDSW compressor rpm is actual rpm x DWNRATEW.
Table 3 Δ TWMAX
Temperature Calculated
difference compressor rpm
1.66 1965 min –1
2 2135 min –1
2.33 2300 min –1
2.66 2465 min –1
3 2635 min –1
3.33 2800 min –1
3.66 2965 min –1
4 3135 min –1
4.33 3300 min –1
4.66 3465 min –1
5 3635 min –1
5.33 3800 min –1
5.66 3965 min –1
6 4135 min –1
6.33 4300 min –1
6.66 4465 min –1
7 4635 min –1
7.33 4800 min –1
7.66 4965 min –1
8 5135 min –1
8.33 5300 min –1
8.66 5465 min –1
9 5635 min –1
9.33 5800 min –1
9.66 5965 min –1
10 6135 min –1
10.33 6300 min –1
10.66 6465 min –1
11 6635 min –1
Notes:
1. See the data in Table 1 on page 47
for each constant in capital letters
in the diagrams.
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