28
6.4 Installation for the first time
Air and moisture in the refrigerant system have undesirable effects as below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
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
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-0
.1M
Pa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve
Summary of Contents for MOC-09CFN1-BS0W
Page 1: ...9ASUL A1 1211 SERVICE MANUAL MIDEA AIRCONDITIONER DC INVERTER SPLIT WALL MOUNTED TYPE...
Page 17: ...15 MS9A 18HRDN1 MP0W MS9A 18CRDN1 MS0W MS9A 18HRDN1 MS0W MS9A 24HRDN1 MP0W...
Page 18: ...16 MS9A 09HRDN1 BQ0W MS9A 12HRDN1 BS0W B...
Page 19: ...17 MS9A 24CRDN1 MP0W...
Page 20: ...18 MS9A 24HRDN1 MS0W...
Page 22: ...20 MOC 12CRDN1 MS0W MOC 12HRFN1 MS0W...
Page 23: ...21 MOF 18HDN1 MP0W MOF 18CRFN1 MS0W...
Page 24: ...22 MOF 18HRFN1 MS0W MOG 24HDN1 MP0W...
Page 25: ...23 MOC 09HFN1 BQ0W MOC 12HFN1 BS0W MOF 24HDN1 MP0W...
Page 26: ...24 MOG 24HDN1 MS0W MOF 24CDN1 MP0W...
Page 58: ...56 E4 Reserved function...
Page 72: ...70...