12
Trobleshooting
Possible Causes
Air Condition Will Not Operate
The power switch is released.
Power supply failure.
The fuse is burnt.
It doesn't reach the setting time for starting up.
Unit Doesn't Start When Pressing ON/OFF Button
It is not four minutes after switch off.
Room temperature is lower than the setting
temperature under cooling mode or higher
than setting temperature under heating mode.
The Wind Blowing Out, But The Cooling / Heating Effect Is Bad
Mistakes in temperature setting.
The air filter is blocked by dust.
The air inlet or outlet of machine is blocked.
Turn the air conditioner on in very hot room.
Cooling capacity is insufficient.
The doors or windows are open.
Noise or vibration
The ground is not level or not flat enough.
WARNING
For maintenance or scrap, please contact
authorized service centers.
Maintenance by unqualified person may
cause dangers.
Feed air conditioner with R290 refrigerant,
and maintain the air conditioner in strictly
accordance with manufacturer's requirements.
The chapter is mainly focused on special
maintenance requirements for appliance with
R290 refrigerant. Ask repairer to read after-
sales technical service handbook for detailed
information.
Qualification requirements of maintenance
personnel
1. Special training additional to usual refrig-
erating equipment repair procedures is
required when equipment with flammable
refrigerants is affected. In many countries,
this training is carried out by national train-
ing organisations that are accredited to
teach the relevant national competency
standards that may be set in legislation.
Solution
Switch on the power.
Wait for the recovery of power supply.
Replace the fuse by professional.
Wait or reset the original setting.
Wait four minutes.
Reset the setting temperature.
Set a proper temperature, setting temperature
should be lower than ambient temperature.
Clean the air filter.
Remove the obstruction.
Allow additional time to remove stored heat
from walls ,ceiling, floor and furniture.
Reconfirm the required cooling / heating.
capacity with your dealer.
Close the doors and windows.
Place the unit on a flat, level ground if pos-
sible.
The achieved competence should be doc-
umented by a certificate.
2. The maintenance and repair of the air
conditioner must be conducted according
to the method recommended by the manu-
facturer. If other professionals are needed
to help maintain and repair the equipment,
it should be conducted under the supervi-
sion of individuals who have the qualifica-
tion to repair AC equipped with flammable
refrigerant.
Inspection of the Site
Safety inspection must be taken before main-
taining equipment with R290 refrigerant to
make sure the risk of fire is minimized. Check
whether the place is well ventilated, whether
anti-static and fire prevention equipment is
perfect.
While maintaining the refrigeration system,
observe the following precautions before
operating the system.
Operating Procedures
1. General work area:
All maintenance staff and others working
in the local area shall be instructed on the
nature of work being carried out. Work
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