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7. Working principle
The cooling unit applies the theory of phase-transition cooling this way: the gaseous refrigerant
is expelled out of the compressor,in high temperature and high pressure,enters into
condenser，cooled forcibly and liquefied in modest temperature and still high pressure， then
goes through the throttling devices such as capillary or expansion valve to become liquid in
lower temperature and lower pressure when it flows into evaporator， afterwards， it returns
to the condenser by phasechange absorbing the heat of inside enclosure. This reciprocating
circulation guarantees the reliable working environment.
8. Maintenance/care
As the maintenance-free cooling device， the unit has been strictly tested before ex.
Factory and all performance passed the international certification. The fan of ball bearing
has a lifespan up to 30，000 hour. The filter mesh is recommended to use in case of
dense dusts and clean at twice every month.
Turn off the power if the cooling unit is kept long not for use.
The power must be switched off in the period of maintenance/care.
9. Quality warranty
All the cooling units in normal use (Refer to 4. Safety notes) shall be granted with a
year of free maintenance. During the valid warranty， the faulty unit will be returned to
factory or handled on the site for repairs.
The product is only limited to the purpose of cooling down the enclosure; otherwise
Leizig shall take on no responsibility for the losses caused by any misconnection to
power or incorrect operations (see regular operations). Electrical circuit drawings.
Low pressure
liquid
Low pressure
bapor
Temperature
sensing pack
Expasion valve/capillary
High pressrue
liquid
High pressrue
vapor
Evaporator
Compressor
Condenser
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