Mitsubishi Montero 1987 Manuel de service télécharger pdf (Page 272)

COllector

can

2OUO315

24-36

AIR-CONDITIONING-Service

Adjustment Procedures

D&ARG,NG THE SYSTEM

Since the air conditioning refrigerant system is pressurized, it will

be necessary to completely discharge the system (in a well ven-

tilated area) before replacing any refrigerant component. The pro-

cedure is as follows:

(1) Install manifold gauge set. Make sure the gauge set valves are

closed before attaching the hoses to the refrigerant system.

(2) Install a long hose to the manifold gauge set connector. Run

this hose to the oil collector can near a shop exhaust system.

A good oil collector can may be made from a large empty

coffee can with a plastic top. Slit the plastic top in the form of

a Y to make an entrance for the refrigerant hose and an exit for

the gas.

(3) Open the compressor discharge and suction line pressure

valves and blow the refrigerant into the oil collect can. Watch

to make sure the hose does not blow out of the collector can.

(4) When the system has been completely discharged, measure

the amount of oil collected in the can. The amount of oil mea-

sured should be added to the refrigerant system before it is

re-charged. Add new oil-discard the used oil.

Caution

It is important to have the correct amount of oil in the refrig-

erant system.

Too little oil will provide inadequate compressor lubrication and

cause a compressor failure. Too much oil will increase discharge

air temperature.

When a 6P148 compressor is installed at the factory, it

contains 110 c.c. (3.7 U.S.fl.oz., 3.9 Imp.fl.oz.) of refrigerant oil.

While the air conditioning system is in operation, the oil is

carried through the entire system by the refrigerant. Some of

this oil will be trapped and retained in various parts of the

system.

When the following system components are changed, it is nec-

essary to add oil to the system to replace the oil being removed

with the component.

Compressor - 4Occ (1.4 U.S.fl.oz., 1.4 Imp.fl.oz.)

Condenser - 30 cc (1.0 U.S.fl.oz., 1.1 Imp.fl.oz.)

Evaporator - 60 cc (2.0 U.S.fl.oz., 2.1 Imp.fl.oz.)

Piping - 10 cc (.3 U.S.fl.oz., .4 Imp.fl.oz.)

Receiver drier - 0 cc (0 U.S.fl.oz., 0 Imp.fl.oz.)

EVACUATING THE SYSTEM

2OUO31

Whenever the system has been opened to the atmosphere, it is

absolutely essential that the system be evacuated or “vacuumed”

to remove all the air and moisture. Air in the refrigerant system

causes high compressor discharge pressures, a loss in system

performance, and oxidation of the compressor oil into gum and

varnish. Moisture in the refrigerant system can cause the expan-

sion valve to malfunction. Under certain conditions, water can

react with the refrigerant to form destructive acids. It is necessary

to adhere to the following procedure to keep air and moisture out

of the system.

(1) Install manifold gauge set. Make sure the gauge set valves are

closed before attaching the hoses to the refrigerant system.

(2) Discharge the system if the manifold gauge set indicates pres-

sure in the system.

(3) Connect a long test hoses from gauge set manifold center

connection to vacuum pump.

(4) Open both manifold gauge set valves.

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Mitsubishi Montero 1987 Manuel de service Page 272

Commentaires sur ces manuels

Mitsubishi Montero 1987 Manuel de service Page 272

Commentaires sur ces manuels

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