EQUATION EQ3-9K - Installation Procedure- Vacuuming; Piping vacuum method

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Installation Procedure- Vacuuming
Piping vacuum method: to use vacuum pump
1 - Detach the service port's cap of 3-way valve, the valve rod's cap for
2-way valve and 3-wav valves. and connect the service port into the
projection of charge hose (low) for gauge manifold.Then connect the
projection of charge hose (center) for gauge manifold into vacuum pump.
2 way valve
2 way valve
2 way valve
3 way valve
3 way valve
3 way valve
Service port
90° for 6 seconds
open
Close
Gauge manifold (R32)
Vacuum pump (R32)
Liquid stop valve
Gas stop valve
CAUTION
If the refrigerant of the air conditioner leaks, it is necessary to make all the refrigerant out. Vacuumize first, then charge
the liquid refrigerant into air conditioner according to the amount marked on the nameplate.
2 - Open the handle at low in gaugemanifold, and operate vacuum pump. If thes-
cale-moves of gause (low) reach vacuum condition in a moment, check the step
1 again.
3 - Vacuumize for over 15min. And check the level gauge which should read -0.1MPa
(-76 cm Hg) at low pressure side. After the completion of vacuumizing, close the
handle " Lo" in the vacuum pump.Check the condition of the scale and hold it for
1-2min. If the scale-moves back in spite of tightening, make flaring work again,
then return to the beginning of the step 3.
4 - Open the valve rod for the 2-way valve to an angle of anticlockwise 90 degree.
After 6 seconds, close the 2-way valve and make the inspection of gas leakage.
5 - No gas leakage? In case of gas leakage, tighten parts of pipe connection. lf lea-
kage stops, then proceed the step 6. If it does not stop gas leakage. discharge
whole refrigerants from the service port, After flaring work again and vacuu-
mize, fill up prescribed refrigerant from the gas cylinder.
6 - Detach the charge hose from the service port, open 2-way valve and 3-way.
Turn the valve rod anticlockwise until hitting lightly.
7 - To prevent the gas leakage, turn the service ports cap, the valve rodis cap for
2-way valve and 3-way's a little more than the point where the torque in-
creases suddenly.