Johnson Controls SABROE HeatPAC, Руководство по эксплуатации

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Operating manual - HeatPAC with reciprocating compressor
009332 en 2021.07
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Appendices
8.3 High-pressure float valve for cascade evaporator
The high-pressure float valve, pos. 1 in Fig. 26, is mounted directly on the condensing side of the cas-
cade evaporator to obtain a compact design and the lowest charge possible. The outlet (expansion line)
goes out the bottom and into a u-turn pipe.
The float valve has a turning mechanism, which opens up two nozzles while the liquid level rises in the
float valve housing. If the housing is empty of liquid, the valve will close but never seal tightly.
The volume of the cascade evaporator is very small, which makes it very sensitive to non-condensable
gasses.
To ensure optimal performance of the cascade evaporator, a by-pass (2 mm orifice), pos. 3 in Fig. 26, is
mounted around the float valve. The by-pass eliminates the risk of non-condensable gasses building up
at the condensing side of the cascade evaporator.
Fig. 26: High-pressure float valve for cascade evaporator
Pos. no. Designation Position during operation
1 HFI float valve Regulating
2 Service valve Open
3 2 mm orifice
4
Service/purge valve Closed
5
Service valve Open
3
2
4
4 5
1