9
4.5 Vacuumizing
1)
The vacuum pump has the vacuum degree of less than -0.1MPa and the air displacement of more than 40L/min.
2)
It is unnecessary to vacuumize the outdoor unit. Don't open the check valves at the gas side and the liquid side of the outdoor unit.
3)
Make sure the vacuum pump can drop up to -0.1MPa within 2 hours; if it fails to drop up to -0.1MPa after 3 hours, check moisture or air leak.
4)
The vacuum pump must have a check valve.
After dropping up to -0.1MPa, the vacuum pump keeps on running for 20-60 minutes.
Connect the vacuum pump
Run the vacuum pump (above 2 hours)
Stop the vacuum pump
Remain vacuum (above 1h)
1. Close the valve of the pressure gauge;
2. Disconnect the pressure gauge and the vacuum
pump;
3.
Close the vacuum pump.
·
Don't use tools and measuring apparatus using in different refrigerants or directly contacting the refrigerant.
·
Don't exhaust air with refrigerant gas.
·
If the vacuum degree cannot reach -0.1MPa, recheck its leakage. If not, keep the vacuum pump on for 1-2h.
4.6
Refilling volume of refrigerant
The refilling volume of refrigerant (R410A) is calculated according to the diameter and length of the pipe at the liquid side of the indoor and outdoor units.
Note: The R410A refrigerant must be weighed by an electronic scale and filled in the liquid state.
!
NOTE
Diameters of pipe at the
liquid side (mm)
Refilling volume of refrigerant equal to the
length of 1m pipe (unit: kg)
φ6.35
0.023
φ9.52
0.0
4
0
4.7 Stop valve instructions
1)
It is closed when leaving the factory;
2)
Open the valve counterclockwise or close the valve clockwise with a 6mm socket head wrench;
3)
After completing the operation, tighten the valve cover;
4)
R410A special tool shall be used to vacuumize the valve and fill the refrigerant at the service entrance. Fill the refrigerant at the service entrance at the
gas side, and vacuumize the valve at the service entrance at the liquid side and the gas side simultaneously.
Vacuumizing
Refilling refrigerant
Service entrance
Valve stem
Valve cover
Opening direction
Opening direction
Gas side
Liquid side
Fig. 4-3 Stop Valve Instructions
Table 4-4 Refilling Volume of Refrigerant
