19
8.3.
Safety operation of flammable refrigerant
(1)
Qualification requirement for installation and maintenance man / Installation of Hydraulic
Unit:
All the work men who are engaging in the refrigeration system should bear the valid certification awarded by the
authoritative organization and the qualification for dealing with the refrigeration system recognized by this
industry. If it needs other technician to maintain and repair the appliance, they should be supervised by the
person who bears the qualification for using the flammable refrigerant.
It can only be repaired by the method suggested by the equipment’s manufacturer.
(2
) Installation notes:
- The unit is not allowed to use in a room that has running fire (such as firesource, working coal gas ware,
operating heater).
- It is not allowed to drill hole or burn the connection pipe.
- The unit must be installed in a room that is larger than the minimum room area. The minimum room area is
shown on the nameplate or following table a.
- Leak test is a must after installation.
(3) Maintenance
notes
:
Check whether the maintenance area or the room area meet the requirement.
- It’s only a
Check whether the maintenance area is well-ventilated.
-The continuous ventilation status should be kept during the operation process.
Check whether there is fire source or potential fire source in the maintenance area.
-The naked flame is prohibited in the maintenance area; and th “no smoking” warning board should be hanged.
nameplate.
Check whether the appliance mark is in good condition.
-Replace the vague or damaged warning mark.
llowed to be operated in the rooms that meet the requirement.
(4) Welding:
If you should cut or weld the refrigerant system pipes in the process of maintaining, please follow the steps as
below:
a. Shut down the unit and cut power supply
b. Eliminate the refrigerant
c. Vacuuming
d. Clean it with N2 gas
e. Cutting or welding
f. Carry back to the service spot for welding
The refrigerant should be recycled into the specialized storage tank.
Make sure that there isn’t any naked flame near the outlet of the vacuum pump and it’s well-ventilated.
(5) Filling the refrigerant:
Use the refrigerant filling appliances specialized for R32. Make sure that different kinds of refrigerant won’t
contaminate with each other.
The refrigerant tank should be kept upright at the time of filling refrigerant. Stick
the label on the system after filling is finished (or haven’t finished).Don’t overfilling.
After filling is finished, please do the leakage detection before test running; another time of leak detection should
be done when it’s removed.
Minimum
room
area
(m
2
)
Charge amount(kg)
≤1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
2.1
2.2
2.3
2.4
2.5
floor location
/
14.5 16.8 19.3
22
24.8 27.8
31
34.3 37.8 41.5 45.4 49.4 53.6
window mounted
/
5.2
6.1
7
7.9
8.9
10
11.2 12.4 13.6
15
16.3 17.8 19.3
wall mounted
/
1.6
1.9
2.1
2.4
2.8
3.1
3.4
3.8
4.2
4.6
5
5.5
6
ceiling mounted
/
1.1
1.3
1.4
1.6
1.8
2.1
2.3
2.6
2.8
3.1
3.4
3.7
4
