SGN141S-1 R290 Self-Contained Low Height Open Refrigerated Display Cabinet Manual
July2021 Final Rev: 30A01 4
SERVICING, MAINTENANCE AND REFRIGERANT HANDLING
1. R290 is classified as flammable refrigerant of Class A3 according to ANSI/ASHRAE. It is a
highly flammable and very easy to ignite. It can burn with explosive impacts.
2. R290 in contact with air can cause a risk of fire or explosion in presence of open flames or
sparks generated by electrical equipment.
3. R290 (Propane) has no odour. Take extra cautions if a leak is suspected i.e. quarantine the
cabinet and call for a qualified refrigeration service technician to attend.
4. Servicing can be only performed by qualified personnel holding a valid certificate and
competence to work on and break into a R290 refrigeration circuit safely.
5. Service intervention must be carried out considering the mentioned above risk: do not use
electric tools and open flames.
6. Components which require substitution: - only use original spare parts for they have been
specifically approved for use with R290 (Propane) refrigerant.
7. The refrigerant circuit is hermetically sealed (closed loop) therefore refrigerant filling,
draining or substitution of some components is not possible without breaking the vacuum.
In such a case:
i. the substitution cannot be performed indoors at the customer’s premises.
ii. the cabinet should be moved to a controlled workshop environment
suitable for the type of repair where work can be conducted safely.
iii. In any case, work in confined spaces must be avoided. Work area can be in
the open or, alternatively, must be properly ventilated. Ventilation should be
able to safely disperse any released refrigerant and expel it safely externally
to the atmosphere.
8. While working on cabinet with R290 during which the refrigerant can be possibly released
to the surrounding space, all possible ignition sources, including cigaree smoking, must be
at least 10 metres away from the place of installaon, maintenance or disposal.
9. In case hot work is required (welding, brazing) best practice must always be applied. This
should require the following procedure to avoid risk of fire or explosion.
i. remove refrigerant safely
ii. purge the circuit (with inert gas)
iii. evacuate
iv. purge again with inert gas
v. open the circuit by cutting (or brazing)
vi. Operator must be properly skilled and authorized to perform hot works on
systems working with flammable refrigerants.
10. In order to reduce flammability hazards the installation of this appliance must
only be carried out by a suitably qualied person.
11. Always use appropriate Personal Protection (PPE) i.e. gloves, safety glasses, boots or shoes,
long pants, long-sleeve shirt, etc.
