Before Operation; Special Remarks; Trouble Shooting - Hitachi RPIL-1.0PNN1DH Installation & Maintenance Manual

Special Remarks

●
3-minute protection after compressor stop
To protect compressor, it will be off continuously for at least 3 minutes once it has stopped.
●
5 - minute protection
Compressor must run for at least 5 minutes once it has operated. During the 5 minutes, compressor will
not stop even that the room temperature reaches the set temperature point unless you use remote controller
to turn off the unit (all indoor units can be turned off by user).
●
Cooling operation
The fan of the indoor unit will never stop running in cooling operation. It continues to operate even if the
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
ventilating mode, to avoid frost or ice forming on the indoor heat exchanger.
●
Cold air prevention
During 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, the 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 the fan speed resume.
●
Blowing out the residual heating air
When stopping the air conditioner in normal operation, the fan motor might run with low speed for a while to
blow out the residual heating air .
Auto restart from 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.

Trouble Shooting

CAUTION
If the trouble still exists even after checking the following, contact your
items.
1. If Trouble still exists
(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 in outdoor or indoor units.
Check if there are too many heating sources in the room.
Check if the air filter is clogged with dust.
Check if the doors or windows are open.
Check if the temperature condition is 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 starting or stopping, 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 can
form on the air panel.
Refrigerant Flow Sound
While the system is being started or stopped, the refrigerant flow sound may be heard.
dealer
4

Before Operation

and inform them of the following