Hitachi RAS-3HVRNME-AF, Installation And Operation Manual, Page: 17 / 40

17
PMML0205A rev.4 - 11/2012
ENGLISH
5 AUTOMATIC CONTROLS
The system is equipped with the following functions.
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THREE MINUTE GUARD
The compressor remains off for at least 3 minutes once it
has stopped. If the system is started within approximately 3
minutes after it has stopped, the RUN indicator is activated.
However, the cooling operation or the heating operation
remains off and does not start until after 3 minutes has
elapsed.
Operation may stop for 6 minutes maximum to protect
compressor.
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FROST PREVENTION DURING COOLING OPERATION
When the system is operated in a low temperature room,
the cooling operation may be changed to fan operation for a
while to avoid frost formation on the indoor heat exchanger.
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AUTOMATIC RESTART AFTER POWER FAILURE
If the power supply is interrupted for short periods of time
(up to 2 seconds) the Remote Control switch will retain the
settings and the unit will restart when the power is restored
(optional function).
If Automatic Restart is required after periods of lost power
supply in excess of 2 seconds please contact your distributor.
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SLOW AIR CONTROL DURING HEATING OPERATION
When the compressor is stopped while the thermostat is
OFF, or the system is performing the automatic defrosting
operation, the fan speed is set at the slow position.
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AUTOMATIC DEFROSTING CYCLE
When the heating operation is stopped by pressing RUN/
STOP switch, frosting on the outdoor unit is checked and the
defrosting operation may be performed for the maximum of
10 minutes.
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PREVENTION OF OVERLOAD OPERATION
When the outdoor temperature is too high during heating
operation, heating operation is stopped due to activation of
the outdoor thermistor until the temperature becomes low.
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HOT START DURING HEATING OPERATION
To prevent cold air discharge, the fan speed is controlled
from the slow position to the set position according to the
discharge air temperature. At this time the lover is fixes
horizontally.
6 BASIC TROUBLESHOOTING
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CAUTION:
When you smell or white smoke occurs from the unit, stop the
system and contact your contractor.
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THIS IS NOT ABNORMAL
−
Sound from deforming Part
During system starting or stopping, and abrading
sound might be heard. However, this is due to thermal
deformation of plastic parts. It is not abnormal.
−
Refrigerant Flow Sound
While the system is being started or stopping, sound from
the refrigerant flow may be heard.
−
Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat
exchanger is melted, resulting in making steam.
−
Dew on Cabinet
When the cooling operation continues for a long period of
timer (higher than 27°C DB/80% R.H.), dew can form on
the cabinet.
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NO OPERATION
Check whether the SET TEMPERATURE is set at the correct
temperature.
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NOT COOLING WELL OR HEATING WELL
−
Check the units to make sure that there are no outside air
flow obstructions or water flow obstructions inside.
−
Check the level of the room’s heat load from other sources.
−
Check if the water filter is clogged with dust.
−
Check if the doors and windows are opened or closed.
−
Check if the temperature condition is within the operating
range.
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IF TROUBLE STILL REMAINS...
If the trouble still remains even after checking the above
items, contact your service contractor and inform the
following data:
−
Unit Model Name
−
Content of Trouble
−
Alarm Code nº. on LCD Controller
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NOTE:
Except for a long period of shutdown, keep the main switch ON,
since the oil heater is energised when the compressor is stopped.
AUTOMATIC CONTROLS