GEA Purger Betriebsanleitung Seite 24

INSTALLATION UND BETRIEBSVORBEREITUNG
MONTAGE DES GERÄTS
selected properly, filled with liquid refrigerant thus trapping non-condensables in
the condenser, so non-condensables cannot reach the receiver when the plant is
running. Consequently, every pos-sible NC trap should be purged individually. It
is not allowed to make one common purge line as the pressures on the outlet of
all condensers will be equalized, making the liquid traps useless. Each purge
valve has to be provided with a non servo working solenoid valve (e.g. Hansen
HS6). It should be installed close to the purge lo-cation to prevent condensation
in the purge line up stream. The solenoid valves should be sequentially opened.
The NC-purger must be positioned as high as the highest available purge point
and connected to the liquid side of the high pressure receiver, again to prevent
pressure balancing of the individual condensers. If the latter is unpractical, a con-
densate drain to the low pressure separator could be made, the position of the
NC-purger is then completely free of choice. In case of DX systems the NC-pur-
ger condensate drain should be connected to one of the evaporator injections
after the thermostatic expansion valve (TXV). If this evaporator can be switched
off, the NC-purger condensate line should be switched off as well
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01.11.2021