Hitachi RAD-25NH7 Service Manual page 41

Heating set temperature
(remote control set temperature
(+))
Dash period
Fan speed set to "auto"
Start
Start/stop switch
Thermo judgment
Max. 3 min.
Defrost signal
Preheating released
Preheating judgment
Ultra-Hi
30sec. 30sec.
Hi
Indoor fan
Med
10sec.
Lo
Ultra-Lo
Operation lamp
1 min.
WMAX2
Max.
(WMAX)
NOTE (11)
Rating
(WSTD)
Wtd
3000
WMIN
0
ultra Hi
Outdoor fan
Reversing valve (heating "on" model)
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.
Basic Heating Operation
Stop Start Stop
Thermo
OFF
30sec. 30sec. 30sec. 30sec.
10sec. 10sec.
15sec.
Control by
Control by Control by
heat exchanger temperature heat exchanger temperature heat exchanger temperature
15sec. 15sec. 15sec.
Lo Hi Hi
150sec. Delay 150sec. Delay
18˚C
Start
Thermo OFF
Preheat released
30sec. 30sec. 30sec. 30sec.
10sec.
15sec.
Control by Control by
10sec. heat exchanger temperature heat exchanger temperature
3min.
15sec.
Hi
Hi
Table 3
Temperature
Stop
Thermo
OFF
15sec.
15sec.
150sec. Delay
Notes:
1. See the data in Table 1 on
∆
TWMAX
Calculated
difference compressor rpm
–1
1.66 1965 min
–1
2 2135 min
2.33 2300 min –1
2.66 2465 min –1
–1
3 2635 min
3.33 2800 min –1
3.66 2965 min –1
4 3135 min –1
–1
4.33 3300 min
4.66 3465 min –1
5 3635 min –1
5.33 3800 min –1
–1
5.66 3965 min
6 4135 min –1
6.33 4300 min –1
–1
6.66 4465 min
7 4635 min –1
7.33 4800 min –1
7.66 4965 min –1
–1
8 5135 min
8.33 5300 min –1
8.66 5465 min –1
9 5635 min –1
–1
9.33 5800 min
9.66 5965 min –1
10 6135 min –1
–1
10.33 6300 min
10.66 6465 min –1
11 6635 min –1
page 43 for each constant in
capital letters in the diagrams.
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