General Description

GENERAL DESCRIPTION









New Air Conditioning System With R134a

Refrigerant R12 (CFC12), previously used in automobiles air conditioning systems is believed to contribute towards the depletion the earth's ozone layer. The ozone layer help to protect us against the harmful ultraviolet rays of the sun.

A newly developed refrigerant, R 134a (HFC 134a), does not the destroy the ozone layer.





Precautions For Servicing R134a Air Conditioners.

1. Use of new refrigerant R134a.
The very different characteristics of refrigerants R134a and R12 have determined the design of their respective air conditioning systems. Under no circumstances allow R12 to enter an R134a system, or vice versa, because serious damage could occur.





2. Compressor oil used in conventional R12 air conditioning systems cannot be used in R134a air conditioning systems.
Always use genuine Toyota R134a air conditioning oil ND-OIL 8, made expressly for use with R134a.





If even a small amount of the wrong oil is changed, it will result in clouding of the refrigerant.
A large amount will cause the compressor to seize up.





3. Use of proper 0-rings and seals. 0-rings and seals used for conventional R12 air conditioning systems cannot be used for R134a air conditioning systems.
Always use genuine Toyota R134a system 0-rings and seals for R134a air conditioning systems.





If 0-rings and/or seals for R12 air conditioning systems are used by mistake in the connections of an R134a air conditioning system, the 0-ring and seals will foam and swell resulting in leakage of refrigerant.









4. Securely tighten the connecting parts to prevent leaking of refrigerant gas.

- Apply a few drops of compressor oil to 0-ring fittings for easy tightening and to prevent leaking of refrigerant gas.

CAUTION: Apply only ND-OIL 8 compressor oil

- Tighten the nuts using 2 wrenches to avoid twisting the tube.

- Tighten the 0-ring fittings or the bolted type fittings to the specified torque.

5. Insert a plug immediately in the disconnected parts to prevent the ingress of moisture and dust.

6. Do not remove plug from new parts until immediately before installation.





7. Discharge gas in new compressor from charging valve before installing it.
If the gas in the new compressor is not discharged first, compressor oil will spray out with gas when the plug is removed.