Bedienungsanleitung Midea MTBD-Serie Mono (Seite 19 von 29) (Englisch)

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installation manual

CAUTION

Flaring

Cut a pipe with a pipe cutter. (Refer to Fig.9-1)

Table 9-1

Insert a flare nut into a pipe and flare the pipe.

Fig.9-1

(mm)

Ø6.35/0.25in 8.3/0.327in 8.7/0.343in

Ø9.52/0.375in 12.0/0.472in 12.4/0.488in

Ø12.7/0.5in 15.4/0.606in 15.80.622in

Ø15.9/0.626in

Ø19.1/0.725in

18.6/0.732in 19.0/0.748in

22.9/0.902in 23.3/0.917in

R0.4~0.8

min max

Pipe gauge

Tightening torque

Flare dimensin A

Flare shape

97.2～118.6 N.m

(990～1210 kgf.cm)

(630～770 kgf.cm)

61.8～75.4 N.m

49.5～60.3 N.m

(504～616 kgf.cm)

32.7～39.9 N.m

(333～407 kgf.cm)

14.2～17.2 N.m

(144～176 kgf.cm)

9.1 Expel The Air

Fasten the nut

Put the connecting pipes at the proper position,

wrench the nuts with hands then fasten it with

two wrenches simultaneously. (Refer to Fig.9-2)

Fig.9-2

Too large torque will harm the bellmouthing and too small will

cause leakage. Please determine the torque according to

Table 9-1.

9. REFRIGERANT PIPE CONNECTION

Lean crude burr

Fig.8-2

10°

Fig.8-3

The branching pipe must be installed horizontally, error angle

of it should not large than 10°. Otherwise, malfunction will be

caused.

Correct Wrong

U-shaped branching pipe

Horizontal surface

A direction view

Use the vacuum pump which vacuum level lower than

-0.1MPa and the air discharge capacity above 40L/min.

The outdoor unit is not necessary to vacuum, don’t open the

outdoor unit gas and liquid pipe shut-off valves.

Make sure the vacuum pump could result as -0.1MPa or

below after 2 hrs or above operation. If the pump operated 3

hrs or above could not achieve to -0.1MPa or below, please

check whether water mix or gas leak inside of the pipe.

8.4 Vacuum with vacuum pump

CAUTION

8.5 Refrigerant amount to be added

Calculate the added refrigerant according to the diameter and

the length of the liquid side pipe of the outdoor/indoor unit

connection. The refrigerant is R410A.

Pipe size on

liquid side

Refrigerant to

be Added per meter

Φ6.35/0.25in

Φ9.52/0.375in

0.015kg/0.033lb

0.030kg/0.066lb

Table.8-4

Don’t mix up the different refrigerants or abuse the tools and

measurements which directly contact with refrigerants.

Don’t adopt refrigerant gas for air vacuuming.

If vacuum level could not get to -0.1MPa, please check whether

resulted by leakage and confirm the leakage site.If no leakage,

please operate the vacuum pump again 1 or 2 hrs.

Connect with vacuum pump

Perform the pump (last for 2 hrs or above)

When get the vacuum level

-0.1MPa, the pump should

keep running for 20-60 mins

Shut down the

vaccun pump

Place the vaccum state unused (1 hrs or above)

1. Close-off the valve of

vacuum meter.

2. Cut off the connection

between pressure meter

and vacuum pump.

3. Close the vacuum

pump.

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