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INSTALLATION AND OPERATION MANUAL
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5.1.1. OPERATION PROCEDURE FOR COOLING, HEATING, DRY AND FAN OPERATIONS
” Before operation:
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Turn on the electrical power supply to the system approximately 12 hours before start-up after a long shutdown. Do not start the
system immediately after connecting the power supply, because the compressor may be damaged if it is not sufficiently heated.
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Make sure the outdoor unit is not covered with ice or snow. If it is, remove the ice or snow with warm water (no hotter than 50°C).
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If the water temperature is over 50°C, the plastic parts may be damaged.
1. Turn on the power supply.
Three vertical lines will appear on the liquid crystal display, with the indication A/C or VENTI.
2. Press the MODE switch.
By repeatedly pressing the MODE switch, the indication changes from COOL, through HEAT, DRY to FAN, in that order (in the case
of cooling-only models, COOL, DRY and FAN).
(The figure shows when the "COOL" mode setting is selected).
3. Press the RUN/STOP switch.
The RUN indicator (red) lights up. The system starts automatically.
NOTE:
Setting temperature, fan speed and air louver direction.
The setting is memorized after the first time and does not require resetting every day. When the setting needs be changed, refer to
the section "Setting the Temperature, Fan Speed and Air Louver Direction".
4. Switch OFF (STOP)
Press the RUN/STOP switch again. The RUN indicator (red) is OFF. The system is automatically stopped.
NOTE:
The fan may continue operating for approximately 2 minutes after the heating operation is stopped.
5.1.2 SETTING THE TEMPERATURE, FAN SPEED AND AIR LOUVER DIRECTION
” DO NOT touch the OK switch.
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The OK switch is used only for servicing.
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If the OK switch is pressed by mistake and the mode is changed from operation to check mode, press the OK switch again for
approximately 3 seconds, wait 10 seconds and then press again.
−
The mode will change back to normal.
” Setting the temperature
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Set the temperature by pressing the TEMP or switch.
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The temperature increases 1°C when the switch is pressed (max 30°C).
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The temperature decreases 1°C when the switch is pressed (min. 19°C for COOL, DRY and FAN modes; min. 17°C for HEAT
mode). (The figure shows the temperature set to 28°C).
” Setting Fan Speed
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Press the FAN SPEED switch.
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When the FAN SPEED switch is pressed repeatedly, the indication changes from HIGH to MEDIUM to LOW, in that order.
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For normal operation, set the fan speed to HIGH.
(The figure shows the fan speed set to MED.)
NOTE:
In the DRY mode, the fan speed automatically changes to LOW, and cannot be altered (however, the indication shows the current
setting).
” Setting the swing louver direction
Press the SWING LOUVER switch: the louver begins to swing. Pressing the switch again fixes the position of the swing louver.
Pressing the switch repeatedly stops and swings the louver successively.
” Fixed position
The indication shows the air flow direction.
” Automatic swing position
The indications move continuously corresponding to the louver swing.
NOTE:
In the heating operation, the louver angle changes automatically.
5.1.3. OPERATION PROCEDURE FOR VENTILATION
This function is available only when the total heat exchanger is connected.
If the procedures below are performed when the total heat exchanger is not connected, the NO FUNCTION indication blinks for 5 seconds.
” Ventilation
Press the VENTI switch
By repeatedly pressing the VENTI switch, the indication changes from A/C through VENTI and A/C+VENTI, in that order.
(The figure shows the A/C + VENTI setting).
NOTE:
Contact your distributor or HITACHI dealer for detailed information.
If the mode is changed to VENTI during individual operation of the air conditioner, the air conditioner will stop. If the mode is changed
to A/C during individual operation of the total heat exchanger, the total heat exchanger will stop.
5.1.4. OPERATION PROCEDURE FOR AUTOMATIC COOLING/HEATING OPERATION
The automatic cooling/heating operation must be set using the optional function. Contact your distributor or HITACHI dealer for more
detailed information. This function enables the operation mode (cooling or heating) to be changed automatically according to the
temperature difference between the set temperature and the suction air temperature.
If the suction air temperature exceeds the set temperature by 3°, the operation changes to COOL mode. If it is 3°C lower than the set
temperature, the operation changes to HEAT mode.
NOTE:
If the heating operation is set at the LOW fan speed, the protective devices will often cause the system to stop. In this case, set the
fan speed to HIGH or MED.
If the outside temperature is over approximately 21°C, the heating operation is not available.
The temperature difference between the cooling and heating operations is quite considerable when this function is used. This function
cannot therefore be used for air conditioning a room where accurate control of temperature and humidity is required.
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CAUTION
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08/07/2010 9:20:11
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