Operation Manual; Special Remarks; Troubleshooting - Hitachi RPIL-1.0UNE1NH Installation And Maintenance Manual

Special remarks

●
3 minutes protection after compressor stop
To protect compressor, it will be continue to be off for at least 3 minutes once it has stopped.
●
5 minutes protection
Compressor must run for
the room temperature reaches the setting temperature point unless you use remote controller to turn off the
unit (all indoor unit can be turned off by user).
●
Cooling operation
The fan of the indoor unit will never stop running in cooling operation. It
compressor stops working.
●
Heating operation
Heating capacity depends on external factors like outdoor unit temperature. Heating capacity might decrease
if outdoor ambient temperature is too low.
●
Anti-freezing function during cooling
When the temperature of the air from the indoor outlet is too low, the unit will run for some time under the fan
mode, to avoid frost or ice forming on the indoor heat exchanger.
●
Cold air prevention
In several minutes after the heating mode is started, the fan of the indoor unit will not run until the heat
exchanger of the indoor unit reaches a certain temperature to prevent cold draft.
●
Defrosting
When the outdoor temperature is too low, frost or ice may form on the outdoor heat exchanger, reducing
heating performance. When this happens, a defrosting system of the air conditioner will operate. At the same
time the fan in the indoor unit stops (or runs at a very low speed in some cases), to prevent cold draft. After
defrosting is over, the heating operation and fan speed restart.
●
Blowing out the residual heating air
When stopping the air conditioner in normal operation, the fan motor will run with low speed for a while to blow
out the residual heating air.
●
Auto re-start from of Power Break
When the power supply is recovered after power break, all presets are still effective and the air-conditioner will
run according to the previous setting.

Troubleshooting

CAUTION
1. If Trouble persists
If the trouble persists even after checking the following, contact your dealer and inform them of the
items.
(1) Unit Model Name
(2) Content of Trouble
2. No Operation
Check whether the SET TEMP is set at the correct temperature.
3. Not Cooling or Heating properly
Check for obstruction of air flow
Check if too many heating sources are located
Check if the air filter is clogged with dust.
Check if the doors or windows are open.
Check if the temperature condition is not within the operation range.
4. This is Not Abnormal
Odour from indoor unit
Unpleasant odour diffuses from indoor unit after a long period of time. Clean the air filter and panels
or allow a good ventilation.
Sound from Deforming Parts
During system start or stop, a sound might be heard. However, this is due to thermal
deformation of plastic parts. It is not abnormal.
Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat exchanger melts resulting in steam.
Dew on Air Panel
When the cooling operation continues for a long period of time under high humidity conditions, dew may
form on the air panel.
Refrigerant Flow Sound
While the system is being started or stopped, sound from the refrigerant flow may be heard.
at least 5 minutes once operational. In the 5 minutes, compressor will not stop even
in indoor and outdoor
continues to operate
units.
in the room.
3

Operation manual

even if the
following