Ch 6 page 29
ELECTRICAL SYSTEM
SHOP MANUAL
Always wear eye and hand protection when working on an A/C system or compressor. Liquid
refrigerant can cause frostbite and / or blindness.
Do not discharge R134a into the atmosphere. Even though its ozone
depletion potential is zero, it does have global warming potential. Re-
covery and recycling are mandated by the clean air act. Use recovery
equipment designated only for R134a. Never introduce another
refrigerant into the R134a equipment.
WARNING
R134a gas properties:
Solid phase - Melting point: 1.1013bar -101°C
Liquid phase - Liquid density: (1.013bar and 25°C) 1206kg/m³
Boiling point: (1.013bar) : -26.55°C
It’s imperative to install a new lter receiver drier after opening of the air conditioning circuit !
WARNING
Liquid phase
Receiver/drier
Expansion valve
Liquid phase inlet
Evaporator
Vapour phase
Compressor
Vapour phase
Condenser
Vapour phase outlet
Liquid phase
Regulation controll
Prior to the inspection:
• Check that the air inlets are not blocked by any residues.
• Check that the cab air louvers are opened to avoid evaporator freeze.
• With the automatic slack adjuster, check the compressor drive belt movement and ten-
sion: A too high tension: early wearing of the compressor bearings
A too low tension: early wearing of the belt
AIR CONDITIONING CONTROL
Commands must be set as follows:
· Air recirculation at maximum
· Temperature setting at minimum
· A/C symbol ON
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