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6 7
Class
Name Classification of instructions
Personnel Qualification
Requirements
A
Professional
Maintenance
Personnel
Personnel, such as installers
and maintenance supervisors,
who are required to install,
repair, and weld the
refrigeration system for
flammable refrigerant products.
Hold A class A certificate
issued by the competent
authority, available online.
B
Regular
contacts
personnel
1. Personnel who do not need to
open the refrigeration system
of combustible refrigerant
products, such as relevant
personnel of transportation
enterprises and general
maintenance personnel of
product after-sales
department, etc
2. Installation and maintenance
personnel of conventional
refrigerant products.
Hold a Class B certificate
issued by the competent
authority, available online.
C
(The
enterprise
internal)
Develop,
design
and test
personnel
Combustible refrigerant system
design personnel, supervision
personnel.
1. Master the skills and
knowledge of basic safety
welding and safety protection
level of combustible
refrigerant:
2. Familiar with product
development process and
capable of design:
3. Qualification certification/
recognition shall be
conducted by the institution
where you work.
• Personnel with class A certificate can carry out the operation of class B personnel;
• Class A and Class B personnel shall be trained and certified by the industry management
institution designated by the state;
• C type personnel should participate in the company's internal organization of professional
training, obtain internal issued certification or accreditation qualifications.
Tooling names Use requirement
Small vacuum
pump
Explosion-proof vacuum pump: ensure a certain accuracy, vacuum degree
should be less than 10 Pa.
Filling
equipment
Special explosion-proof charging equipment: with certain accuracy, the
charging amount deviation is less than 5 g.
Leak detector Regular calibration: annual leakage rate is not higher than 10 g.
Concentration
detector
A) The maintenance site shall be equipped with A fixed combustible
refrigerant concentration detector, which shall be connected to the safety
protection alarm system: its error must be guaranteed not to be higher
than 5%.
B) The installation site shall be equipped with portable combustible
refrigerant concentration detector, which can realize two-level acousto-
optic alarm: its error must be guaranteed not to be higher than 10%.
C) Regular calibration.
D) Function check and confirmation shall be carried out before use.
Pressure
gauge
A) The pressure gauge shall be calibrated regularly
B) R290 and R161 refrigerant can use the pressure gauge of R22, R32
refrigerant can use the pressure gauge of R410A.
Fire
extinguisher
Carry a fire extinguisher during installation and maintenance. There should
be at least two kinds of dry powder, carbon dioxide and foam extinguishers
in the maintenance site, and they should be placed in the prescribed
position with eye-catching signs and accessible places.
• The installation site should be in a well-ventilated condition.
• The sites for installing and maintaining an air conditioner using Refrigerant R32 should be free
from open fire or welding smoking, drying oven or any other heat source higher than 548°C
which easily produces open fire.
• When installing an air conditioner, it is necessary to take appropriate anti-static measures such
as wear anti-static clothing and or gloves.
• 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.
• lf the indoor unit suffers refrigerant leak during the installation, all the personnel should go out
till the refrigerant leaks completely for 15 minutes. lf 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.
• lt is necessary to choose the place where the inlet and outlet air of the indoor unit is even.
• lt 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, and also prevent mechanical damage from occurring.
1. REPAIRS TO SEALED COMPONENTS
• During repairs to sealed components, all electrical supplies shall be disconnected from the unit
being worked on prior to the removal of sealed covers and other parts (if any). If it is necessary
to have an electrical supply connected to the unit during servicing, then a permanently operating
form of leak detection shall be located at the most critical point to warn of a potentially
hazardous situation.
• Particular attention shall be paid to the following to ensure that when working on electrical
components, the casing is not altered in such a way that the level of protection is affected. This
shall include damage to the cables, an excessive number of connections, terminals not made to
the original specification, damage to seals, incorrect fitting of glands, etc. Ensure that the unit is
mounted securely. Ensure that the seals or sealing materials have not been degraded to a point
that they no longer serve the purpose of preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer’s specifications.
INFORMATION FOR QUALIFICATION OF WORKERS
All operators or refrigeration system maintenance personnel shall have a valid certificate issued
by an industry-recognized evaluation body to certify that they are qualified for the safe disposal
of refrigerant agents as recognized by the industry;
• Maintain and repair the equipment only in accordance with the method recommended by the
equipment manufacturer. If other professionals are required to assist in the maintenance and
repair of equipment, do so under the supervision of personnel qualified to use combustible
refrigerants.
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