Hitachi RAC-25NX2, Service Manual

Page: 58 / 151

57
1.33˚
C.
SFTDSW
0.66˚
C.
Fan speed set to " auto "
1 min.
Basic Heating Operation
Start
Stop Stop Stop Start Start
Thermo
OFF
Thermo
OFF
Heating set temperature
(remote control set temperature
(+))
Start/stop button
Thermo judgment
Indoor fan
Ultra-Hi
Hi
Med
Lo
Ultra-Lo
Operation lamp
Max.
Rating
3000
0
Compressor speed
Outdoor fan
Reversing valve (cooling " on " model)
Thermo OFF
Dash period
TWMAX
Wtd
Defrost signal
Preheating judgment
30sec. 30sec.
10sec.
15sec. 15sec.
15sec. 15sec. 15sec.
10sec.
15sec.
15sec.
3min.
Max. 3 min.
Preheating released
Control by
heat exchanger temperature Control by
heat exchanger temperature
15sec.
Control by
heat exchanger temperature Control by
heat exchanger temperature Control by
heat exchanger temperature
18˚C
10sec.
30sec. 30sec.
10sec.
30sec. 30sec. 30sec. 30sec. 30sec. 30sec.
10sec.
Preheat released
WMIN
(WSTD)
(WMAX)
NOTE (10)
WMAX2
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 tempe 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 outdoor temperature is
lower than 4°C.
(6) During Hotkeep or Defrost mode, indoor operation lamp will blink at interval of 0.5 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 “Lo”, compressor rpm will be limited to WBEMAX. When fan is set to
" Med " , compressor rpm will be limited to WJKMAX.
(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, when room temperature reaches set tempe SFTDSW compressor rpm is actual rpm x DWNRATEW.
Temperature
Calculated
difference
compressor rpm
1.66°C 2200 min
–1
2.00°C 2600 min
–1
2.33°C 3000 min
–1
2.66°C 3400 min
–1
3.00°C 3800 min
–1
3.33°C 4200 min
–1
Table 3 Compressor rpm
Notes:
1. See the data in Table 1-Table 2 on
page 47 & 49 for each constant in
capital letters in the diagrams.
(with shift value)