20
EN
KEN002VAC
v1• 11.11.2020
SPECIAL TOOLS
4. It is necessary to choose the site convenient for installation or maintenance wherein the air inlets and outlets of
the indoor and outdoor units should be not surrounded by obstacles or close to any heat source or combustible
and/or explosive environment.
5. If the indoor unit suffers refrigerant leak during the installation, it is necessary to immediately turn off the valve
of the outdoor unit and all the personnel should go out till the refrigerant leaks completely for 15 minutes. If
the product is damaged, it is a must to carry such damaged product back to the maintenance station and it is
prohibited to weld the refrigerant pipe or conduct other operations on the user‘s site.
6. It is necessary to choose the place where the inlet and outlet air of the indoor unit is even.
7. 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.
Tool name
Requirement(s) for Use
Mini Vacuum Pump
It should be an explosion-proof vacuum pump; can ensure certain precision and its vacuum
degree should be lower than 10Pa.
Filling Device
It should be a special explosion-proof filling device; have certain precision and its filling
deviation should be less than 5g.
Leak Detector
It should be calibrated regularly; and its annual leak rate should not exceed 10g.
Concentration Detector
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.
Pressure Gauge
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.
Fire Extinguisher
It is necessary to carry fire extinguisher(s) when installing and maintaining an air conditi
-
oner. 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.
