Hitachi RAC-90JP Instruction Manual page 8

Operation Instructions
●
Wiring
1. Method of connecting to air-conditioner:
1.1 Remove the front cover and electric box cover of the Indoor unit.
1.2 Connect the communication wire to the PCB of the Indoor unit (connector no: CN22)
1.3 Re-install the electric box cover and front cover, be careful don't clip the wire.
●
Abnormality
1. When abnormality occurs, there will be a display on the control panel indicating
"PRESS [ON/OFF] SWITCH TO RESTART"
2. Reset Button – when errors happen (the display is interfered by noise signal and system can't
operate). Please use a small pin to insert in the hole and press 3 seconds above, under power ON
status. Then it will return to its initial factory setting.
●
Power Failure
1. All the indications are OFF.
2. Once the unit is stop by power failure, the unit will not be started again although the power
recovers. Perform the starting procedures again.
3. In case of instantaneous power failure within 2 seconds the unit will be started again automatically.
◆ Troubleshooting
Unit does not start:
1. Is the main power source switch to the unit ON?
2. Is the main fuse normal?
Please contact your service center if the
problem is still not solved. Do not try to
repair the unit by yourself.
◆ Maintenance
1. Clean or replace the air filter.
2. Clean the cabinet with clean dry cloth.
3. Clean the condensate drain pan and the drain
piping.
4. Clean the condenser and evaporator coil. Call
your serviceman to do this type of work.
5. Check for abnormal sound and vibration. If you
find abnormal sound and vibration, stop the unit,
and contact your service center for proper
maintenance.
Switch the unit OFF before cleaning the air filter.
Poor cooling operation:
1. Are there any obstacles which hamper sufficient
air to the indoor unit and outdoor unit coil?
2. Check the temperature setting to make sure that it
is set at the desired temperature.
3. Check the air filter if it is dirty or clogged.
1 Turn the air
inlet open.
- 5 -
2
Removing
off air filter.