Hitachi RAC-25NX2, Service Manual

Page: 48 / 151

Start Stop Start Stop
Start / stop switch
Operation lamp
Start / stop switch
Reserve switch
Cancel switch
Operation lamp
Timer lamp
Timer memory
(Off-timer during stop) (Change in reserved time)
Start / stop switch
Start / stop button
Reserve switch
Reserve button
Cancel switch
Cancel button
Operation lamp
Operation lamp
Timer lamp
Timer lamp
Timer memory
Timer memory
OFF OFF OFF OFF ON ON ON ON
(On-timer during operation) (Change in reserved time)
(Off -> On timer) (Off -> On timer) (On -> Off timer) (On -> Off timer)
during operation
during stop
BASIC MODE
MODEL RAF- 25 NX2
Operation mode
Basic operation of
start / stop switch
Fan Cooling Dehumidifying Heating Auto
Off-timer
On-timer
Off On
On Off timer
T
imer functions
Fan speed mode (indoor fan)
Auto
Operates at "Hi" regardless of
the room temperature.
Operates at "Lo" regardless of
the room temperature.
Operates at "Silent" regardless
of the room temperature.
Performs only fan operation at
the set speed regardless of
the room temperature.
Enters sleep operation after
set as on the left.
Action during sleep operation
silent (sleep) operation.
Operates at "Med" regardless
of the room temperature.
Hi
Med
Lo
Silent
Basic operation of
temperature controller
Sleep operation
(with sleep button ON)
Changes from "Hi" to "Med"
or "Lo" depending on room
temperature.
1. Runs at "Hi" until first
thermo off after operation
is started.
2. Runs at "Lo" when thermo
is off.
Set to "Ultra-Hi" when the
compressor runs at maximum
speed, and to "Hi" in other
modes.
Same as at left.
Same as at left.
Same as at left.
Set to "Lo" in modes other than
when the compressor stops.
Set to "Silent" in modes other than
when the compressor stops.
･
Same as at left.
･
See page 67.
See page 63.
･
Same as at left.
･
See page 71.
･
Same as at left.
･
See page 79.
･
Same as at left.
･
Performs the sleep operation of each operation mode.
See page 71.
Set to "Ultra-Lo", "Lo", "Med", "Hi", "Ultra-Hi" or "Stop" depending on the room
temperature and time.
Set to "Stop" if the room temperature is 18
℃
in the "Ultra-Lo" mode other
than during preheating (cooling is recovered at 18.33
℃
).
Set to "Ultra-Hi" when the compressor is running at maximum speed during
hot dash or when recovered from defrosting.
Set to "Ultra-Lo", "Lo", "Med" or "Stop" depending on the room temperature and time.
Set to "Stop" if the room temperature is 18
℃
in the "Ultra-Lo" mode other than during
preheating (cooling is recovered at 18.33
℃
).
See page 75.
Notes:
1. The speed set of rotaion for the fan motor in each operation mode are as shown in Table 1.
2. The set room temperatures in the diagram include the shift values in Table 2.
Room temperature
1
℃
0.66
℃
1.33
℃
Temperature set
Thermo judgment
for cooling
Compressor
Hi
Med
Lo
On On
Off
3' (Compressor stopped
forcibly for 3 minutes)
Start / stop swith
Operation lamp
Fan speeds
Hi
Hi
Med
Med
Lo
Lo
Set to "Ultra-Lo", "Lo", or "Stop" depending on
the room temperature and time.
Set to "Stop" if the room temperature is 18
℃
in the "Ultra-Lo" mode other than during
preheating (cooling is recovered at 18.33
℃ ).
The fan speed is controlled by the heat
exchanger temperature; the overload control is
executed as in the following diagram:
Heat exchanger temperature
KAFON
KAFOF
"Med" with overload
"Lo"
On
On
Off
– 4 7 –
Operating mode is judged by room temperature and outdoor temperature.
(1) Judging by outdoor temperature
･ Operating mode is judged by outdoor temperature.
Only when the mode is not restricted by this judgment, the judgment by room temperature in the
next paragraph will be performed.
(a) Outdoor temperature
≧ 27 ℃ : Restricted to cooling
(b) Outdoor temperature ≦ 16 ℃ : Restricted to heating
(2) Judging by room temperature
Operating mode at start up is judged (Initial judgment)
(a) Conditions for judgment (any of the followings)
･
When auto operation is started after 1 hour has elapsed since the operation was stopped.
･ When auto operation is started after the previous manual mode operation.
･ When the operating mode is switched to auto while operating at manual mode.
(b) Judging method
･ Room temperature ≧ 25 ℃ 3 ℃ : Cooling
･ Room temperature ＜ 25 ℃ 3 ℃ : Heating
※
(
3 ℃ is the fine adjustment value from the remote controller.
Judging operating mode change during operation (Continuous judgment)
(a) Conditions for judgment (any of the followings)
･ The mode is reviewed at every interval time.
･
When auto operation is started again before 1 hour has elapsed since the operation was
stopped.
(b) Judging method
･ Judge by setting the hysteresis on the final preset temperature.
The final preset temperature is the actually targeted preset temperature which is the sum of
the basic preset temperature and each type of shift value (e.g. 3
℃
by remote controller,
preset temperature correction value, powerful shift value, etc.).
[Currently cooling]
･
Room temperature
≦
Final preset temperature
−
2
℃
Change to heating
･
Room temperature
＞
Final preset temperature
−
2
℃
Continue cooling
[Currently heating]
･ Room temperature ≧ Final preset temperature ＋ 3 ℃ Change to cooling
･
Room temperature
＜
Final preset temperature
＋
3
℃
Continue heating
Cooling
Heating
16 ℃ 27 ℃
25
℃
Outdoor
temperature
Room
temperature
Heating
Cooling
＋
3
℃
− 2 ℃
final preset temperature
Set to "ultra-Lo", "Lo", "Med", "Hi", "ultra-Hi" or "stop" depending on the room temperature,
time and heat exchange temperature. Set to "stop" if the room temperature is 18˚C in the
"ultra-Lo" mode other than during preheating (cooling is recovered at 18.33˚C).
When the compressor is running at maximum speed
during hot dash or when recovered from defrosting.
In modes other than
left.
TDTMPH
TDTMPM
TDTMPL
(TDTMPH) + (TDSFNP) + (TDSFLH)
(TDTMPM) + (TDSFNP)
(TDTMPL) + (TDSFNP)
˚C
Lo
Med
Hi or ultra-Hi
(fan speed set
to "auto")
Heat exchanger
temperature
(
(
(