Manual Inventor V6MCRI32-18WiFiR (page 27 of 148) (English, German)

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Page 27 

 Page 26 

Air Evacuation

Safety Precautions

CAUTION

• Use a vacuum pump with a gauge reading

lower than -0.1MPa and an air discharge

capacity above 40L/min.

• The outdoor unit does not need vacuuming.

DO NOT open the outdoor unit’s gas and

liquid stop valves.

• Ensure that the Compound Meter reads

-0.1MPa or below after 2 hours. If after

three hours of operation and the gauge

reading is still above -0.1MPa, check if

there is a gas leak or water inside the pipe.

If there is no leakage, perform another

evacuation for 1 or 2 hours.

• DO NOT use refrigerant gas to evacuate

the system.

Evacuation Instructions

Before using manifold gauge and vacuum pump,

read their operation manuals to familiarize

yourself with how to use them properly.

Manifold Gauge

Compound gauge

-76cmHg

Low pressure valve High pressure valve

Charge hose Charge hose

Vacuum pump

Pressure gauge

Low pressure valve

Fig. 8.1

1. Connect the charge hose of the manifold

gauge to service port on the outdoor unit’s

low pressure valve.

2. Connect another charge hose from the

manifold gauge to the vacuum pump.

3. Open the Low Pressure side of the manifold

gauge.Keep the High Pressure side closed.

4. Turn on the vacuum pump to evacuate the

system.

5. Run the vacuum for at least 15 minutes, or

until the Compound Meter reads -76cmHG

(-1x105Pa).

6. Close the Low Pressure side of the manifold

gauge, and turn off the vacuum pump.

7. Wait for 5 minutes, then check that there has

been no change in system pressure.

NOTE: If there is no change in system pressure,

unscrew the cap from the packed valve (high

pressure valve). If there is a change in system

pressure, there may be a gas leak.

8. Insert hexagonal wrench into the packed valve

(high pressure valve) and open the valve by

turning the wrench in a 1/4 counterclockwise

turn. Listen for gas to exit the system, then

close the valve after 5 seconds.

Flare nut

Cap

Valve body

Valve stem

Fig. 8.2

9. Watch the Pressure Gauge for one minute to

make sure that there is no change in pressure.

The Pressure Gauge should read slightly higher

than atmospheric pressure.

10.Remove the charge hose from the service port.

11.Using hexagonal wrench, fully open both the

high pressure and low pressure valves.

OPEN VALVE STEMS GENTLY

When opening valve stems, turn the hexagonal

wrench until it hits against the stopper.

DO NOT try to force the valve to open further.

12.Tighten valve caps by hand, then tighten it

using the proper tool.

 Page 27 

Note On Adding Refrigerant

CAUTION

• Refrigerant charging must be performed after wiring, vacuuming and the leak test.

• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system.

Doing so can damage or impact the unit’s function.

• Charging with unsuitable substances may cause explosions or accidents. Ensure that the

appropriate refrigerant is used.

• Refrigerant containers must be opened slowly. Always use protective gear when charging

the system.

• For the R290 or R32 refrigerant model, make sure the condtions within the area have been

made safe by control of ammable material when the refrigerant added into air conditioner.

• DO NOT mix refrigerants types.

Some systems require additional charging depending on pipe lengths. The standard pipe length

varies according to local regulations. For example, in North America, the standard pipe length is

7.5m (25’) In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be

charged can be calculated using the following formula:

Liquid Side Diameter

R32 : (Total pipe length -

standard pipe length)x

12g(0.13oZ)/m(ft)

(Total pipe length -

standard pipe length)x

24g(0.26oZ)/m(ft)

(Total pipe length -

standard pipe length)x

40g(0.42oZ)/m(ft)

φ6.35(1/4”) φ9.52(3/8”) φ12.7(1/2”)

R22

(orice tube in the indoor unit):

(Total pipe length -

standard pipe length)x

30g (0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)x

65g(0.69oZ)/m(ft)

(Total pipe length -

standard pipe length)x

115g(1.23oZ)/m(ft)

R22

(orice tube in the outdoor unit):

(Total pipe length -

standard pipe length)

x15g(0.16oZ)/m(ft)

(Total pipe length -

standard pipe length)

x30(0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)

x60g(0.64oZ)/m(ft)

(Total pipe length -

standard pipe length)

x65g(0.69oZ)/m(ft)

R410A:

(orice tube in the indoor unit):

(Total pipe length -

standard pipe length)

x30g(0.32oZ)/m(ft)

(Total pipe length -

standard pipe length)

x65g(0.69oZ)/m(ft)

(Total pipe length -

standard pipe length)

x115g(1.23oZ)/m(ft)

R410A:

(orice tube in the outdoor unit):

(Total pipe length -

standard pipe length)

x15g(0.16oZ)/m(ft)

(Total pipe length -

standard pipe length)

x30g(0.32oZ)/m(ft)

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