Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1657

1-14  HEATING AND AIR CONDITIONING

•

Do not use the same vacuum pump for evacuating the R-

134a and R-12 systems interchangeably (The vacuum

pump hose fitting is a M10

×

1.5).

•

R-134a vacuum pumps must have a positive shutoff valve.

CAUTION
Never use the same vacuum pump for both R-134a and R-

12 systems, as cross contamination of compressor oil

may occur.

Refrigerant Recovery, Recycling and

Charging

•

R Avoid releasing the R-134a into the atmosphere.

Use the ACR

4

 (R-134a Refrigerant Recovery/Recycling/

Recharging/System) or equivalent to recover and recycle R-

134a.  Note that the ACR

4

 (or equivalent) is not

interchangeable between the R-134a and R-12 systems.

ACR

4

 (115V 60 Hz) : 5-8840-0629-0 (J-39500-A)

ACR

4

 (220-240V 50/60 Hz)

: 5-8840-0630-0 (J-39500-220A)

ACR

4

 (220-240V 50/60 Hz Australian model)

: 5-8840-0631-0 (J-39500-220ANZ)

HEATING AND AIR CONDITIONING  1-15

Refrigerant Leak Inspection

•

The flame type gas leak detector for the R-12 system

cannot be used with the R-134a system.

•

The electric leak detector for the R-12 cannot be used with

the R-134a system as the R-134a particles are far smaller

than the R-12 molecules and, therefore, may not be always

detected.  Use leak detectors designed exclusively for the

R-134a system.

1-16  HEATING AND AIR CONDITIONING

PRECAUTIONS FOR REPLACEMENT OR
REPAIR OF R-134a AIR CONDITIONING PARTS

There are certain procedures, practices and precautions that

should be followed when servicing air conditioning systems:

•

Keep your work area clean.

•

Always wear safety goggle and protective gloves when

working on refrigerant systems.

•

Beware of the danger of carbon monoxide fumes caused by

running the engine.

•

Beware of discharged refrigerant in enclosed or improperly

ventilated garages.

•

Always disconnect the negative battery cable and discharge

and recover the refrigerant whenever repairing the air

conditioning system.

•

When discharging and recovering the refrigerant, do not

allow refrigerant to discharge too fast; it will draw

compressor oil out of the system.

•

Keep moisture and contaminants out of the system.  When

disconnecting or removing any lines or parts, use plugs or

caps to close the fittings immediately.

Never remove the caps or plugs until the lines or

reconnecting the lines, use two wrenches to support the line

fitting, to prevent from twisting or other damage.

•

Always install new O-rings whenever a connection is

disassembled.

•

Before connecting any hoses or lines, apply new specified

compressor oil to the O-rings.

•

When removing and replacing any parts which require

discharging the refrigerant circuit, the operations described

in this section must be performed in the following sequence:

1) Using the ACR

4

 (R-134a Refrigerant Recovery/

Recycling/Recharging/System) or equivalent to

thoroughly discharge and recover the refrigerant.

ACR

4

 (115V 60Hz)

:5-8840-0629-0 (J-39500-A)

ACR

4

 (220-240V 50/60Hz)

: 5-8840-0630-0 (J-39500-220A)

ACR

4

 (220-240V 50/60Hz Australian model)

: 5-8840-0631-0 (J-39500-220ANZ)

2) Remove and replace the defective part.

3) After evacuation, charge the air conditioning system and

check for leaks.

HEATING AND AIR CONDITIONING  1-17

REPAIR OF REFRIGERANT LEAKS

Refrigerant Line Connections

Install new O-ring, if required. When disconnecting or

connecting lines, use two wrenches to prevent the connecting

portion from twisting or becoming damaged.

When connecting the refrigerant line at the block joint, securely

insert the projecting portion of the joint portion into the

connecting hole on the unit side and secure with a bolt.

Apply specified compressor oil to the O-rings prior to

connecting.

CAUTION:
Compressor (PAG) oil to be used varies according to

compressor model.  Be sure to apply oil specified for the

model of compressor.

O-rings must be fitted in the groove (1) of refrigerant line.

Insert the nut into union. First tighten nut by hand as much as

possible. Then, tighten nut to specified torque.

(Refer to "Special Parts Fixing Nuts and Bolts" in this section)