Appendix 3
Adaptive superheat
Regulation is here based on the evaporator’s load by means of
MSS search (MSS = lowest permissible superheat).
(The superheat reference is lowered to the exact point where
instability sets in).
The superheat is limited by the settings for min.and max.
superheat.
Accidental damage, poor installation, or site conditions, can give
rise to malfunctions of the control system, and ultimately lead to a
plant breakdown.
Every possible safeguard is incorporated into our products to
prevent this. However, a wrong installation, for example, could still
present problems. Electronic controls are no substitute for normal,
good engineering practice.
Danfoss wil not be responsible for any goods, or plant
components, damaged as a result of the above defects. It is the
installer's responsibility to check the installation thoroughly, and
to t the necessary safety devices.
Particular attention is drawn to the need for a “force closing” signal
to controllers in the event of compressor stoppage, and to the
requirement for suction line accumulators.
Your local Danfoss agent will be pleased to assist with further
advice, etc.
Appendix 1
Interaction between internal and external start/stop functions
and active functions.
Appendix 2
If there are two evaporators sharing the same suction line,
the signal from the pressure transmitter can be used by two
controllers.
Internal Start/stop Off Off On On
External Start/stop (DI) Off On Off On
Refrigeration (DO2) Off On
Sensor monitoring Yes Yes
Installation considerations
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