Service Manual
Installation and Maintenance
42
Welding
1. 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 N
2
gas
e. Cutting or welding
f. Carry back to the service spot for welding
2. Make sure that there isn’t any naked flame near the outlet of the vacuum pump and it’s well-ventilated.
3. The refrigerant should be recycled into the specialized storage tank.
Filling the refrigerant
1. Use the refrigerant filling appliances specialized for R32. Make sure that different kinds of refrigerant won’t contaminate
with each other.
2. The refrigerant tank should be kept upright at the time of filling refrigerant.
3. Stick the label on the system after filling is finished (or haven’t finished).
4. Don’t overfilling.
5. After filling is finished, please do the leakage detection before test running; another time of leak detection should be done
when it’s removed.
Safety instructions for transportation and storage
1. Please use the flammable gas detector to check before unload and open the container.
2. No fire source and smoking.
3. According to the local rules and laws.
Maintenance notes
1. Check whether the maintenance area or the room area meet the requirement of the nameplate.
It’s only allowed to be operated in the rooms that meet the requirement of the nameplate.
2. Check whether the maintenance area is well-ventilated.
The continuous ventilation status should be kept during the operation process.
3. Check whether there is fire source or potential fire source in the maintenance area.
The naked flame is prohibited in the maintenance area; and the “no smoking” warning board should be hanged.
4. Check whether the appliance mark is in good condition.
Replace the vague or damaged warning mark.
