Basic Mode - Hitachi RAF-50FX8 Service Manual

BASIC MODE

MODEL RAF-50FX8
Operation mode
Fan Cooling
Basic operation of
start / stop switch
Off-timer
On-timer
Changes from "Hi" to "Med"
or "Lo" depending on room
temperature.
Auto
Temperature set
for cooling
Thermo judgment
Compressor
Hi
Med
Lo
1. Runs at "Hi" until first
thermo off after operation
is started.
2. Runs at "Lo" when thermo
is off.
Operates at "Hi" regardless of Set to "Ultra-Hi" when the
Hi
the room temperature. compressor runs at maximum
speed, and to "Hi" in other
modes.
Operates at "Med" regardless Same as at left.
Med
of the room temperature.
Lo Operates at "Lo" regardless of Same as at left.
the room temperature.
Operates at "Silent" regardless Same as at left.
Silent
of the room temperature.
Basic operation of Performs only fan operation at See page 63.
temperature controller the set speed regardless of
the room temperature.
Start / stop swith
Operation lamp
Hi
Med
Lo
Hi Med Lo
Sleep operation ･Same as at left.
Enters sleep operation after
･See page 67.
(with sleep button ON) set as on the left.
Action during sleep operation
silent (sleep) operation.
Dehumidifying
Start Stop Start
Start / stop switch
Operation lamp
Start / stop switch
Reserve switch
Cancel switch
Operation lamp
Timer lamp
Timer memory
(Off-timer during stop)
Start / stop switch
Reserve switch
Cancel switch
Operation lamp
Timer lamp
Timer memory
(Change in reserved time)
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).
Room temperature
When the compressor is running at maximum speed
during hot dash or when recovered from defrosting.
On On
Off
3' (Compressor stopped
forcibly for 3 minutes)
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℃).
Set to "Lo" in modes other than Set to "Ultra-Lo", "Lo", or "Stop" depending on
when the compressor stops. 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 "Silent" in modes other than
The fan speed is controlled by the heat
when the compressor stops.
exchanger temperature; the overload control is
executed as in the following diagram:
See page 71. See page 75.
･Same as at left. ･Same as at left.
･See page 71. ･See page 79.
Heating
Stop
(Change in reserved time)
(On-timer during operation)
In modes other than
left.
˚C
(TDTMPH) + (TDSFNP) + (TDSFLH)
TDTMPH
(TDTMPM) + (TDSFNP)
TDTMPM
(TDTMPL) + (TDSFNP)
TDTMPL
Heat exchanger
temperature
Hi or ultra-Hi
(fan speed set
to "auto")
Med
Lo
Heat exchanger temperature
KAFON
KAFOF
On On
Off
"Med" with overload
"Lo"
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 ≧ 22℃ ±3℃ : Cooling
･ Room temperature ＜ 22℃ ±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
−2℃
Heating
final preset temperature
･Same as at left.
･Performs the sleep operation of each operation mode.
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.
– 57 –
Auto
Room
temperature
Cooling
22℃
Heating
16℃ 27℃ Outdoor
temperature
Cooling
＋3℃