目录.p65

(1) Refrigerant system with normal function.

Meter reading

Low pressure end:

0.15-0.25Mpa

High pressure end:

1.37-1.57Mpa

(2) Water in cooling system.

Air conditioner--Refrigerant

When cooling system is

working, the pressure in low

pressure end changes to

vacuum or normal periodically.

Water vapor enters refrigerant

system, and freezes on the ex-

pansion valve, the system

stops cycle in short time, when

ice melts, it returns to normal

again.

(1)Change the condenser.

(2)Remove water in pipeline

with method of taking out

vacuum repeatedly.

(3)Fill applicable new

refrigerant.

zDryer locates at full humidity

state.

zWater vapor of refrigerant

freezes on the outlet orifice

of expansion valve to ob-

stacle freezing cycle.

Phenomenon Possible reason Diagnose Method

(3) Lack refrigerant

Situation: too cold periodically, then lose cooling degree.

zThe pressure of high and low

pressure end is low.

zThere is air bubble on

window.

zRefrigerant leaks.

Some part of refrigerant system

leaks.

(1)Check it with leakage

measurer, if necessary, re-

pair it.

(2)Fill refrigerant to applicable

quantity.

(3)If meter pressure reading is

0, after checking and repair-

ing leaking position, take out

vacuum.

zRefrigerant in system lacks.

zCooling degree is not

enough.

Phenomenon Possible reason Diagnose Method

State: lack refrigerant

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