Aiwa -09CHSRINV/TP11 Service Manual page 26

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It is necessary to choose the place where the inlet and outlet air of the indoor unit is even.
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It is necessary to avoid the places where there are other electrical products, power switch plugs and
sockets, kitchen cabinet, bed, sofa and other valuables right under the lines on two sides of the indoor unit.
Special tools:
Tool Name
Mini Vacuum Pump
Filling Device
Leak Detector
Concentration
Detector
Pressure Gauge
Fire Extinguisher
Maintenance
1). Inspections before maintenance.
(1) Inspection of maintenance environment
 There should be no leaked refrigerant in the room before operation.
 It is only allowed to operate in a room which meets the area requirement on the nameplate.
 It is necessary to make the room keep a continuous ventilation state at the time of maintenance.
 The room in the maintenance should be free from fire or welding, smoking, drying oven or any other goods
temperature higher than 370℃ (R290)/548℃ (R32) which easily produces fire.
 During the maintenance, it is necessary to ensure that any person's any mobile phone or any electronic
product with radiation in the room is powered off.
 The maintenance area should be equipped with a drying powder or carbon dioxide fire extinguisher and
that such fire extinguisher can work.
(2) Inspection of maintenance equipment
 Check the maintenance equipment is applicable to the refrigerant or not and it is only allowed to use the
professional equipment recommended by the air conditioner manufacturer.
 Check the refrigerant leak detector whether has been calibrated. The set maximum alarm concentration
Air Conditioner Service Manual
It should be an explosion-proof vacuum pump; can ensure certain precision and its
vacuum degree should be lower than 10Pa.
It should be a special explosion-proof filling device; have certain precision and its
filling deviation should be less than 5g.
It should be calibrated regularly; and its annual leak rate should not exceed 10g.
A) The maintenance site should be equipped with a fixed-type combustible
refrigerant concentration detector and connected to a safeguard alarm system;
its error must be not more than 5%.
B) The installation site should be equipped with a portable combustible refrigerant
concentration detector which can realize two-level audible and visual alarm; its
error must be not more than 10%.
C) The concentration detectors should be calibrated regularly.
D) It is necessary to check and confirm the functions before using the concentration
detectors.
A) The pressure gauges should be calibrated regularly.
B) The pressure gauge used for Refrigerant 22 can be used for Refrigerants R290
and R161; the pressure gauge used for R410A can be used for Refrigerant 32.
It is necessary to carry fire extinguisher(s) when installing and maintaining an air
conditioner. On the maintenance site, there should be two or more kinds of dry
powder, carbon dioxide and foam fire extinguishers and that such fire extinguishers
should be placed at stipulated positions, with eye-catching labels and in handy
places.
Requirement(s) for Use
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