Stulz Tel-Air-2 Series, Operating Instructions Manual

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measuring instruments must be periodically calibrated;
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check work procedures before starting the job. Check the wiring diagram and get an overall
picture of how the system is structured.
It is necessary, while maintenance is being done:

for the maintenance person to be aware of which circuits are under high voltage;

no resistance measurements must be made on live circuits;

use only one hand when testing live circuits;

ground the terminals of the instrument before measuring live circuits;

always strictly comply with the suggestions mentioned above.
Maintenance can be held to be terminated when all components have been reinstalled and the
unit has its original appearance.
10.4 Safety standards to comply with when working on refrigeration circuits
The refrigerant used for this machine can be dangerous if it is not properly used. Several
precautions must be taken when handling this substance:

never release, store or use the refrigerant near open flames. The refrigerant is non-toxic.
Contact with flames causes combustion which generates toxic gases that can corrode metal
surfaces;

never expose the eyes to contact with the refrigerant since it can reach temperatures of
-40°C;

never expose the skin to contact with the refrigerant. If this happens then the damaged part
must be treated using the same procedures used in combination with frostbite and freezing;

avoid high concentrations of refrigerant since these can cause suffocation. In this case the
person must be evacuated from the room and undergo artificial respiration;

avoid brazing or welding in the presence of refrigerant vapours;

do not place gas heating equipment or electrical radiators in places where refrigerant vapours
may be present;

do not smoke;

do not overheat gas cylinders; do not exceed the refrigerant gas limit indicated on the
technical data plate;

the cooling system must be handled with care as it may contain acids as a result of motor
burn-out. Therefore, protective gloves, goggles and clothing must be worn;

eliminate pressure from the entire cooling system before brazing or welding. Welding when
the circuit is under pressure is extremely dangerous due to the risk of the piping rupturing and
molten material being projected by the refrigerant gas pressure.