Hitachi RAS-18CH7 Service Manual page 44

Operation starts in advance so that the room temperature reaches
G
the preset value at the set time.
The operation time is obtained as follows depending on the room
G
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 1 minute if OT is not zero.
Heating
(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.
Heating
Setting temp. – Room temp. Time (min.) Setting temp. – Room temp. Time (min.)
00 – 01.00 00
01.25 – 03.00 10
03.25 – 07.00 20
07.25 – 10.00 30
10.25 – 13.00 40
13.25 – 16.00 50
16.25 – 19.00 60
"NICE
19.25 – 22.00 60
TEMPERA-
22.25 –
10
TURE"
❈ The preset temperature value shown above does not
reservation
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.
(Heating)
When the room temperature < Set value + compensation shift, it
is regarded to be "attained" and 5 minutes are reduced from the
compensation time.
(Cooling)
When the room temperature < Set value + compensation shift, it's
operated same as above.
"Not attained" check
Performed once when the "NICE TEMPERATURE" timer is completed.
(Heating)
When the room temperature < Set value + compensation shift 1°C,
it is regarded to be "Not attained" and 5 minutes are added to the
compensation time.
(Cooling)
When the room temperature > Set value + compensation shift
+1°C, it's operated same as above.
❈ If the room temperature is within +1°C from the set value +
compensation shift, compensation is not done.
Cooling
Air
00 ~ 60 min.
blowing
8
00 ~ 60 min.
direction
control
–60 ~ 60 min.
Cooling
00.00 – 02.00 00
02.25 – 05.00 15
05.25 – 08.00 30
08.25 – 11.00 45
11.25 – 60
Item
Operation switching
Temporary switch
Service switch
Nice temperature reservation
Defrosting
Sleep circuit
Heater operation at the time of sensor dehumidification
Automatic blowing direction
Filter sign
Wireless mode
Item
Thermostat operation (Thermostat relay)
Low-temperature defrosting
G The air deflector control operation shown below is done when the swing switch
is pressed or when the operation mode is changed.
G The air deflector control operation shown below is done when the operation
switch is turned off.
Specification
Item
3-way
Cooling/
dehumidi-
Up
fying
Down Down
❈ Swing start direction
Heating
(When the
operation
switch is
turned off
Automatic
shut
operation)
Table 1 Specifications
Automatic
Heating
Sensor dehumidification
Cooling
Fan
Cooling
Table 2 Sensor operation values
ON temperature
Cooling, sensor
dehumidification
power relay (°C)
Differential (°C)
(T1)
Other detailed specifications
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 ¡ M ¡ H as
AUTO (Swing)
when thermo ON.
2. If "cooling" is selected during "sensor
Up
dehumidification" 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
The same as cooling dehumidifying dehumidification". It is same for "AUTO"
G
sensor dehumidification cooling "sensor
dehumidification" "cooling".
3. The filter sign lights after 100 hours
operation of the room fan. The lamp goes
out when the POWER SWITCH set to
OFF and ON again.
4. After the failure mode is started (indicator
lamp flickering), rapid mode changing
cannot be done.
5. If the operation is made by the nice
temperature reservation during the sleep
operation,
continuously occurs, and for the advance
RAS-18CH7/RAS-24CH7
time, the temperature difference between
the set temperature without sleep shift
Yes
and "room temperature" is used.
Yes
Yes
Yes
Yes
Yes (automatic)
Yes
Yes
Yes
Yes
No
Yes
Yes
Heat and Cool wireless
RAS-18CH7/RAS-24CH7
16 17.6
24 25.6
33.6
0.33
ON (°C) 4.0
Reset (°C) 12.0
the normal operation
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