Midea MS11D-24HRN1 Сервис мануал онлайн [32/56] 624624

Neola On-off DM12-01.01.07en

32 Service manual

● Moisture in the refrigerant circuit may freeze and block capillary tubing.

● Water may lead to corrosion of parts in the refrigerant system.

Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested

and evacuated to remove gas and moisture from the system.

Gas leak check (Soap water method):

Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit

connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles

come out, the pipes have leakage.

1. Air purging with vacuum pump

1. Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and

3-way valves are set to the closed position.

2. Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..

3. Connect the charge hose of handle hi connection to the vacuum pump.

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

5. Operate the vacuum pump to evacuate.

6. Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If

the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If

the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage

points.

Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump.

Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum

pump).

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum

pump

Lo Hi

Handle Hi

Two-way valve

Manifold valve

Compound meter

Pressu

gauge

20Pa

Handle Lo

Charge hose

(Outdoor unit)

Three-way valve