Bedienungsanleitung Midea MUED-Serie (Seite 12 von 25) (Englisch)

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installation manual

2. Closing stop valve

Remove the cap and turn the valve clockwise with the

hexagon wrench.

Securely tighten the valve until the shaft contacts the

main bodyseal.

Make sure to tighten the cap securely.

For the tightening torque, refer to the table below.

Table 7-3

Tightening torque N M (Turn clockwise to close)

Stop

Valve size

Shaft (valve body)

Cap

(Valve lid)

Ø6.35

Hexagonal

wrench 4 mm

Ø9.52

Ø12.7

Ø15.9

Hexagonal

wrench 6 mm

Hexagonal

wrench 6 mm

Ø19

Maintenance nut

35～40

23～27

18～22

13.5～16.5 5～7

7～9

9～11

11～13

11.5～13.9

Additional Refrigerant Charge

7.2

Refrigerant cannot be charged until field wiring has been

completed.

Refrigerant may only be charged after performing the leak

test and the vacuum pumping.

When charging a system, care shall be taken that its

maximum permissible charge is never exceeded, in view of

the danger of liquid hammer.

Charging with an unsuitable substance may cause

explosions and accidents, so always ensure that the

appropriate refrigerant is charged.

Refrigerant containers shall be opened slowly.

Always use protective gloves and protect your eyes when

charging refrigerant.

NOTE

CAUTION

If a negative result is gotten for R from Table 7-4, no

refrigerant needs to be added nor removed.

Additional refrigerant will be twice of R from Table 7-4 if

the indoor unit installed throttle assembly.

The outdoor unit is factory charged with refrigerant. Calculate

the added refrigerant according to the diameter and the

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

connection.(suitable for throttle outdoor unit)

Fig.7-9

Using the vacuum pump

Loosen and remove the maintenance nuts of stop valves A

and B, and connect the charge hose of the manifold valve to

the service port of stop valve A. (Be sure that stop valves A

and B are both closed)

Connect the joint of the charge hose with the vacuum pump.

Open the Lo-lever of the manifold value completely.

Turn on the vacuum pump. At the beginning of pumping,

loosen the maintenance nut of stop valve B a little to check

whether the air comes in (the sound of the pump changes,

and the indicator of compound meter turns below zero). Then

fasten the maintenace nut.

When the pumping has finished, close the Lo-lever of the

manifold valve completely and turn off the vacuum

pump.Make pumping for 15 minutes or more and check that

the compound meter indicates -76cmHg(-1X10 Pa)

Loosen and remove the cap of stop valves A and B to open

stop valve A and B completely, then fasten the cap.

Disassemble the charge hose from the service port of stop

valve A, and fasten the nut.

Fig.7-8

Fig.7-7

Always use a charge hose for service port connection

After tightening the cap, check that no refrigerant leaks

arepresent.

service port

cap

maintenance nut

Stop valve

Gas side

Liquid side

hexagon holeshaftseal

Outdoor

unit

Indoor

unit

CAUTION

Pressure meterMulti-meter

-76 cmHg

Lo-lever

Charge hose Charge hose

Vacuum pump

Hi-lever

Manifold valve

8. CONNECT THE DRAIN PIPE

Install the drainpipe of the indoor unit

The outlet has PTI screw bread, Please use sealing materials

and pipe sheath(fitting) when connecting PVC pipes.

Table 7-4

Liquid tube(mm) R410A R22

Ø6.35

Ø9.52

Ø12.7

Ø15.9

Ø19

0.022kg/m×(L-5)

0.011kg/m×(L-5)

0.060kg/m×(L-5)

0.030kg/m×(L-5)

0.110kg/m×(L-5)

0.060kg/m×(L-5)

0.170kg/m×(L-5)

0.085kg/m×(L-5)

0.250kg/m×(L-5)

0.125kg/m×(L-5)

0.030kg/m×(L-5)

0.015kg/m×L

0.065kg/m×(L-5)

0.030kg/m×L

0.115kg/m×(L-5)

0.060kg/m×L

0.190kg/m×(L-5)

0.095kg/m×L

0.290kg/m×(L-5)

0.145kg/m×L

orifice in the indoorunit

orifice in the outdoorunit

orifice in the indoorunit

NOTE:The number of bends is up to the length of the max

height drop.Usually for each 10m need a bend.

NOTE:the table above refer to the liquid tube.

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