Bedienungsanleitung Midea Mission - 27 (Seite 8 von 8) (Englisch)

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TEST RUNNING

Perform the electric safe check after completing installation:

1. Grounding work

After finishing grounding work, measure the grounding resistance by visual detection and

grounding resistance tester. Make sure the grounding resistance is less than 4 .

2. Electrical leakage check (performing during test running)

During test operation after finishing installation, the serviceman can use the electroprobe

and multimeter to perform the electrical leakage check. Turn off the unit immediately if

leakage happens. Check and find out the solution ways till the unit operate properly.

A: Lo packed valve B: Hi packed valve

C and D are ends of indoor unit connection.

CAUTION

Indoor unit

check point

Outdoor unit

check point

Cover

Fig.22

Electrical safety check

Gas leak check

1. Soap water method:

Apply a soap water or a liquid neutral detergent

on the indoor unit connections and outdoor unit

connections by a soft brush to check for leakage

of the connecting points of the piping. If bubbles

come out, it indicates that the pipes have leakage.

2. Leak detector

Use the leak detector to check for leakage.

TEST RUNNING

3.Safety and leakage check

Perform test operation after completing gas leak check at the flare nut connections and

electrical safety check.

Check that all tubing and wiring have been properly connected.

Check that the gas and liquid side service valves are fully open.

1. Connect the power, press the ON/OFF button on the remote controller to turn the unit on.

2. Use the MODE button to select COOL, HEAT, AUTO and FAN to check if all the functions

works well.

3. When the ambient temperature is too low(lower than 17 C), the unit cannot be controlled by

the remote controller to run at cooling mode, manual operation can be taken. Manual

operation is used only when the remote controller is disable or maintenance necessary.

Hold the panel sides and lift the panel up to an angle until it remains fixed with a clicking

sound.

Press the Manual control button to select the AUTO or COOL, the unit will operate under

Forced AUTO or COOL mode(see User Manual for details).

4. The test operation should last about 30 minutes.

When relocate the unit to another place,

perform evacuation using vacuum pump.

Make sure the refrigerant added into the air

conditioner is liquid form in any case.

(Not applicable to the units adopt freon R22 )

Open the valve stem until it hits against the

stopper. Do not try to open it further.

Securely tighten the valve stem cap with a

spanner or the like.

Valve stem cap tightening torque (See

Tightening torque table in previous page ).

Outdoor

unit

Indoor

unit

Refrigerant

Flare nut

Stopper

Cap

Valve body

Packed valve

Half union

Gas side

Liquid side

Valve stem

Fig.19

Fig.20

2.When Using the Vacuum Pump

(For method of using a manifold valve, refer

to its operation manual.)

1. Completely tighten the flare nuts, A, B, C, D,

connect the manifold valve charge hose to a

charge port of the low-pressure valve on the

gas pipe side.

2. Connect the charge hose connection to the

vacuum pump.

3. Fully open the handle Lo of the manifold valve.

4. Operate the vacuum pump to evacuate. After

starting evacuation, slightly loose theflare nut

of the Lo valve on the gas pipe side and

check that the air is entering(Operation noise

of the vacuum pump changes and a

compound meter indicates 0 instead of minus)

5. After the evacuation is complete, fully close

the handle Lo of the manifold valve and stop

the operation of the vacuum pump. Make

evacuation for 15 minutes or more and check

that the compound meter indicates

-76cmHg (-1x10 Pa).

6. Turn the stem of the packed valve B about

45 counterclockwise for 6~7 seconds after

the gas coming out, then tighten the flare nut

again. Make sure the pressure display in the

pressure indicator is a little higher than the

atmosphere pressure.

7. Remove the charge hose from the Low

pressure charge hose.

8. Fully open the packed valve stems B and A.

9. Securely tighten the cap of the packed valve.

Fig.21

Caution in handling the packed valve

Manifold valve

Compound meter

-76cmHg

Handle Lo

Handle Hi

Charge hose

Vacuum pump

Pressure gauge

Low pressure valve

OUTDOOR UNIT INSTALLATION

Manual control

button

AUTO/COOL

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