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6.1 Inspection and confirmation before debugging
1. Check and make sure the refrigerating pipeline and communication line
connecting with the indoor and air-conditioning units are connected with
the same refrigerating system. Otherwise, some running faults occur.
2. The power supply voltage is within the rated voltage of ±10%.
3. Check and make sure the power supply line and the control line are
correctly connected.
4. Before power-on, make sure there is no short circuit.
5. Check if all units have passed 24-hour nitrogen pressure-maintaining
(40kgf /cm²) test.
6. Make sure the debugged system is fully vacuumized, dried and filled
with the refrigerant as specified.
6.2 Preparation before debugging
1. Calculate the refilling volume of refrigerant for each set of units according to the length of on-site liquid pipe.
2. Prepare the required refrigerant.
3. Prepare the system plan, system piping diagram and control wiring diagram.
4. Mark the set address codes on the system plan.
5. Turn on the power supply switch of the air-conditioning unit in advance, and make sure it is power-on for more
than 12 hours, so that the heater heats the compressor oil.
6. Fully open air pipe check valve, liquid pipe check valve and oil balance valve of the air-conditioning unit. If they
are fully opened, the machine may be damaged.
7. Check if the power supply phase sequence of the air-conditioning unit is correct.
8. Check if all dialing switches of the indoor and air-conditioning units are set according to the technical require-
ments of the product.
6.3 Filling of names of connecting systems
When the multiple indoor units are arranged, in order to distinguish the connecting systems of indoor and air-condi-
tioning units, all systems shall be named respectively and recorded on the nameplate on the electronic control box
cover of the air-conditioning unit.
6.4 Precautions against refrigerant leak
1. The refrigerant of the air conditioner is harmless and nonflammable.
2. The room for the air conditioner shall have an appropriate space. In case of refrigerant leak, it cannot go beyond
the critical concentration. In addition, necessary measures can be taken.
3. The critical gas concentration harmless to the human body is 0.3 kg/m³.
4. Confirm the critical concentration according to the following steps and take corresponding measures.
a. Calculate the filling volume of refrigerant (A[kg])
Volume of refrigerant = filling volume of refrigerant before delivery (see the nameplate) + refilling volume of
refrigerant corresponding to the length of pipe
b. Calculate the indoor volume (B [m³]) (by the minimum volume)
c. Calculate the refrigerant concentration:
6. Trial Run
Fig. 6-1 Filling of Names of Connecting Systems
A[kg]
≤ Critical concentration:0.3[Kg/m³]
B[m³]
18
Indoor unit type
Room name
Example: 2nd floor, first system, indoor (A)
Remark: -2F-1A
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