Code +030220811- rel. 1.0 – 26.04.2007
10
3.2 Positioning with external pressure probe
If there is the need to simplify the inspection and replacement of the pressure probe, or to share the reading of the
probe between master and slave utilities (for multiplexed showcases with controllers that support this function), the
pressure probe can be installed outside of the showcase and away from the temperature probe. This is possible
only where there is no device that alters the pressure, creating a pressure drop in the section that separates
the two probes (in particular, the liquid/gas exchanger that is often installed downstream of the evaporator).
3.3 Positioning for reverse-cycle heat pumps (E
2
V in bi-
directional operation)
In this case, the pressure and temperature probes should be installed in the common suction branch (low pressure)
in the refrigerant circuit.
Given the reduced distance between the point where the superheat is measured and the compressor, the control
settings and the superheat set point will need to be calibrated to safe values.
Fig. 3.c
Fig. 3.d
installation
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