Specifications
4
The compressor continuously draws refrigerant vapour
from the evaporator at a rate set by the amount of guide
vane opening or the compressor rotation speed.
After the condensing phase the liquid refrigerant passes
through the orifices into the FLASC chamber (flash
subcooler - see figure below).
Passing over these orifices a part of the liquid refrigerant
flashes to vapour. By coming into contact with the
entering condenser water tubes (colder) this vapour is
recondensed and the liquid refrigerant is collected in a
chamber where a float valve forms a liquid seal to prevent
the FLASC chamber vapour from entering the evaporator.
This device allows subcooling of the liquid refrigerant
entering the evaporator, resulting in an enthalpy gain and
improved unit energy efficiency.
The motor and the lubricating oil are cooled by liquid
refrigerant taken from the bottom of the condenser vessel
(at the level of the float chamber – see figure below). Flow
of refrigerant is maintained by the pressure differential that
exists due to compressor operation. The flow is split between
motor cooling and oil cooling systems..
If the machine includes a factory-installed variable-frequency
drive (19XRV), the motor and oil cooling system is the
same as for the base machines. In this case the liquid
refrigerant used for the motor and oil cooler also supplies
a cooling heat exchanger in the variable-frequency drive
cabinet.