1143
Model Code Page
83. Air conditioner
1. 1. 1994
6000--8750 831 1
15. 5. 1993
Maintenance, fault tracing and
repairs
Safety precautions
Important! If the air conditioner system must be opened, this
work must be done by an expert who knows refrigeratingsys-
tems.
--- Thepressure of the refrigerant is always greater than itsnor-
mal boiling point. If piping is split,the refrigerantwillevaporate
or boil very rapidly.
---Uncontrolled escape of refrigerant must be avoided. The
refrigerants Freo n 12 and R134a are non---flammable, non---
toxic (except when in c ontact with a flame) and non---corros-
ive (except in co ntac t with water).
--- Never attempt to empty the system by loosening a connec-
tion. Slow emptying without danger can only be carried out
using a manifold gauge set.
--- You should be very carefulwhen handling refrigerant. It can
freeze the skin or the eyes on direct contact . Never handle
refrigerant without wearing safety goggles, as well as gloves.
--- Do not empty the system in a room where there is a flame.
Decomposition of R12 gives phosgene gas which is deadly.
The same precautions must be taken if you are looking for
leaks. Refrigerant R134a and open flame form poisonous and
stimulating compounds ( e.g. hydrofluoric acid)
--- Never weld or clean with steam near a filled system: excess
pressure may be created with possible leakage.
--- If it is necessary to retighten a connection, use two
spanners for tightening, so as to prevent distortion which may
give rise to leakage.
--- Do not store refrigerant in the sun or close to a source of
heat.
--- Avoid subjecting the bottle to impact. Do not carry the
bottle in the passenger compartment of a vehicle.
In the event of an accident, proceed as follows:
--- If you get refrigerant in your eyes, wash them carefully with
a solution of mineral oil, and continue to wash them carefully,
with a solution of boric acid and water (1 teaspoonful of acid,
diluted in a quarter of a cup of water). Cont act a doctor
immediately.
Important! Never wash you eyes with pure water because
refrigerant+water causes corrosive acid.
--- Freezing caused by liquid refrigerant can be treated by pro-
gressively thawing the injured area with cold water and then
applying a dry skin cream. Contact a doctor immediately.
Maintenance
--- Before switching on the air conditioner, ensure that win-
dows and doors are properly closed. If for any reason the cab
cannot be completely closed, the air recycling system must
be switched off. If these recommendations are not observed,
there is a risk of blockage at the evaporator and risk of dam-
age to the compressor.
--- Check externally the drier, condenser and hoses (if the
evaporator or expansion valve for any reason should be
checked, the cab roof and the evaporator housing cover must
be removed). All impurities (and ice on evaporator) cause
malfunctions. Check also occasionally the tightness of the
compressor belts.
--- Check regularly through the drier inspection glasses mois-
ture and refrigerant filling in the system (see next page).
--- Always when the system has leaked and it has been
opened and specially if brown or yellow colour can be seen
in the drier inspection glass or if the moisture indicator has
changed its colour, the drier should be changed. Also if the
heat fuse has melted (not heat fuse if refrigerant R134a), the
drier must be changed.
--- From the bott om of the evaporator housingthere are drawn
three drain hoses through which the condensing water flows
away from the housing. This prevents icing on the evaporator.
--- In order to keep the system in good condition, we recom-
mend to operate the system for several minutes each month
in order to lubricate all the components, since the compressor
oil can get mixed with the refrigerant.
--- When restarting the compressor, specially if it has not oper-
ated for some time, proceed in the follo wingmanner to ensure
lubrication right from the first rotations of the compressor:
. Switch on the electromagnetic clutch by switching the fan
on and moving the temperature switch to cold.
. Crank over the tractor engine for a few seconds with the fuel
stop button out.
. Then push in the fuel stopbutton, start the engine and allow
to idle slowly for several minutes.
A simple functional check:
a) Startthe engine and adjustengine revs to 1500 r/min.Turn
the fan switch to max speed and select the max cooling effect
with the temperature switch (compressor starts).
b) Check temperature of different components:
--- Low pressure hoses, compressor inlet hose should be cold
when touched by hand.
--- Compressor outlet hose, condenser, drier and every high
pressure hose should be warm when touched by hand
Note! Expansion valve and evaporator are accessible only
after removing the cab roof. The thermostatic temperature
switch is accessible after removing the roof panel in the cab.
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