Hitachi RAC-18G5, Service Manual

Page: 38 / 53

●
The air de  ector control operation shown below is done when the swing switch
is pressed or when the operation mode is changed.
●
The air de  ector control operation shown below is done when the operation
switch is turned off after the  lter sign lamp is lit.
Item
3-way AUTO (Swing)
Speci  cation
Cooling/
dehumidi-
fying
Air
blowing
direction
control
8
The same as cooling
●
dehumidifying
Other detailed speci  cations
1. When the room temperature starts to
increase within 3 minutes after thermo
OFF in ““cooling”” and fan speed ““AUTO””,
the fan speed changes L
A
M
A
H as
when thermo ON.
2. If ““cooling”” is selected during ““sensor
dehumidi  cation”” operation, the operation
continues as it is with the thermo ON.
The 3 minutes delay is not started. The
set temperature and fan speed depend
on the remote control signal.
It is same for ““cooling”” –– –– –– –– ““sensor
dehumidi
 cation””. It is same for ““AUTO””
sensor dehumidi  cation cooling ““sensor
dehumidi  cation”” ““cooling””.
3. The filter sign lights after 200 hours
operation of the room fan. The time is
cleared when the ““ (AUTO SWING)””
button is pressed while the device is on
““STANDBY MODE””.
4. If the operation is made by the nice
temperature reservation during the
sleep operation, the normal operation
continuously occurs, and for the advance
time, the temperature difference between
the set temperature without sleep shift and
““room temperature”” is used.
–– 41 ––
●
Operation starts in advance so that the room temperature reaches
the preset value at the set time.
●
The operation time is obtained as follows depending on the room
temperature when operation starts.
(1) Calculation method of the moved-up time.
Moved-up time (MT) = Moved-up time depending on the temperature
difference (OT) + compensation time (HT).
MT is at least 5 minute if OT is not zero.
Cooling
(MT) 00 ~ 60 min.
(OT) 00 ~ 60 min.
(HT) ––60 ~ 60 min.
Obtain OT (moved-up time depending on the temperature difference)
from the table below.
6
““NICE
TEMPERA-
TURE””
reservation
Cooling
Setting temp. –– Room temp. Time (min.)
00.00 –– 02.00 00
02.25 –– 05.00 15
05.25 –– 08.00 30
08.25 –– 11.00 45
11.25 –– 60
❈ The preset temperature value shown above does
not include any shift value.
(2) Compensation
1
The ““Attained”” state is monitored and a ““Not attained”” check is
done to revise the compensation time (HT).
““Attained”” monitor
Continuously monitored during ““NICE TEMPERATURE”” operation.
(Cooling)
When the room temperature < Set value + compensation shift,
it is regarded to be ““attained”” and 5 minutes are reduced from
the cooling compensation time.
““Not attained”” check
Performed once when the ““NICE TEMPERATURE”” timer is completed.
(Cooling)
When the room temperature > Set value + compensation shift
+1°C, it is regarded to be ““Not attained”” and 5 minutes are added
to the cooling compensation time.
❈
If the room temperature is within +1°C from the set value +
compensation shift, compensation is not done. Item
ON temperature
Thermostat operation (Thermostat relay)
power relay (°C)
Differential (°C)
Low-temperature defrosting
Cooling, sensor
dehumidi
 cation
(T1)
16 17.0
24 25.0
32 33.0
0.33
ON (°C) 2.0
Reset (°C) 9.0
Table 2 Sensor operation values
Item RAS-18G5
Automatic No
Circulator Yes
Operation switching Sensor dehumidi  cation Yes
Cooling Yes
Fan No
Temporary switch Yes (automatic)
Service switch Cooling Yes
Nice temperature reservation Yes
Defrosting Yes
Sleep circuit Yes
Heater operation at the time of sensor dehumidi  cation No
Automatic blowing direction Yes
Filter sign Yes
Wireless mode Cooling
Table 1 Speci  cations
RAS-18G5
Circulator
(When the
operation
switch is
turned off
after the
 lter sign
lamp
lights.)