Stulz Tel-Air-2 Series, Operating Instructions Manual

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E/0618/35A/21
Compressor
A reciprocating compressor is used for the TLx40 model with 400V/3Ph+N/50Hz power supply.
TLx40 with 230V/1Ph/50Hz power supply is provided with a rotary compressor. Scroll
compressors are used for all the other models.
Compressors are basically composed of an electric motor and a mechanical section which is
powered by this motor for pumping the refrigerant gas.
In reciprocating compressors the pumping unit consists of a piston which slides inside a cylinder
and which generates, depending on its phase, compression and aspiration.
In rotary compressors, the pumping unit consists of a rotor with sliding blades, inside a stator. As
the rotor turns, compression is obtained with space reduction between rotor, blades and stator.
In scroll compressors the pumping unit consists of two spirals positioned one inside the other.
One spiral is fixed while the other performs orbital motion which aspirates and compresses the
gas.
Condenser
This part allows the release of the heat of the coolant gas in the environment. It consists of an
exchange pack with copper piping and aluminium fins (suitable only for non-corrosive and non-
salty environments).
Filter dryer
This is a mixed mechanical/chemical filter and serves the purpose of filtering the coolant which
goes through it, at the same time eliminating humidity particles.
Thermostatic valve
This adapts coolant evaporation pressure, inside the evaporator exchanger, to the real thermal
load. This component is factory set during testing and must not be tampered with.
Evaporator
This is the part where the transfer of the heat, contained in the air in the shelter, to the coolant
gas takes place. It consists of copper pipes and aluminium fins (suitable only for non-corrosive
and non-salty environments).