Vacuum pump vacuum operation _ in refrigeration system

in the operation of air conditioner vacuum, vacuum operation of separator than monolithic air conditioner ( Window machine) The vacuum operation is simple. Due to the split type air conditioner outdoor has two cut-off valve, so there is a maintenance port dedicated to vacuum, measuring the pressure of low voltage or high pressure cut-off valve and filling refrigerant, can be directly with the compound pressure gauge. Air conditioning has no special maintenance, so need a vacuum valve to welding pipe valves, in order to connected to the compound pressure gauge. The main introduction of split type air conditioning vacuum operation.

( 1) The whole system of pumping air into vacuum state, the use of two or three outdoor cut-off valve ( Cooling capacity is less than 7100 w, is less than 3 of the air conditioning is used only for low voltage, three-way valve, so only a single pump)

operation steps are as follows:

the compound pressure gauge in the middle of the tube is connected to the vacuum pump, valve with low pressure hose tee ( Dc valve) The connection.

open the compound pressure gauge of low-pressure LO; The valve make indoor and outdoor machine to connect fully.

open the vacuum pump, check whether the join point is enough to seal, and run the vacuum degree of vacuum pump system is less than 133 pa.

closed compound manometer in the middle of the hose valve and close the vacuum pump.

the middle tube from the vacuum pump and connect to the small fluorine on the bottle. Hose and compound pressure gauge is the connection status among small fluorine bottle valve slightly open, discharge the air hose between, between the hose connected to the compound pressure gauge is firm. Open the compound pressure gauge of high and low pressure valves, valve fully open small fluorine bottle and freon gas into the cooling system automatically.

( 2) The whole system vacuum aspiration, using the tee valve (outdoor Refrigerating capacity greater than 7100 w, 3 above, namely the low voltage side and high side) outdoor Use the tee valve) 。

the compound pressure gauge of the high pressure hose and high pressure the 3-way valve ( Fluid pipe cut-off valve) Low pressure hose connection, the compound pressure gauge connected to the low pressure tee valve ( Gas pipe cut-off valve) Hose and vacuum pump connection in the center.

open the compound pressure gauge of the high pressure and low pressure valve and the 3-way valve, make indoor and outdoor machine to connect fully.

open the vacuum pump. At the same time, check the connection points will be enough to seal, and run the vacuum degree of vacuum pump system is less than 133 pa.

closed compound pressure gauge of the high pressure and low pressure valves, close vacuum pump.

the middle tube from the vacuum pump and connect to the small fluorine on the bottle. Hose and compound pressure gauge is the connection status among small fluorine bottle valve slightly open, discharge the air hose between, between the hose connected to the compound pressure gauge is firm. Open the compound pressure gauge of the high pressure and low pressure valves, valve fully open the small bottle. Freon gas automatically into the refrigeration system.

( 3) The process of pumping air into vacuum state, outdoor outdoor use two or three stop valve ( Cooling capacity is less than 7100 w, the air conditioning is less than 3)