Installation Considerations - Danfoss EKC 315A User Manual

Installation considerations

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.
Appendix 1
Interaction between internal and external start/stop functions
and active functions.
Internal Start/stop
External Start/stop (DI)
Refrigeration (DO2)
TQ actuator
Expansion valve relay
Temperature monitoring
Sensor monitoring
Appendix 3
If the flow of refrigerant is to be distributed to several expansion
valves, this can be accomplished by using AKV valves and EKC
controllers as slave modules.
Remember to open the functions in:
- EKC 315A's menu o09
- EKC 347's menu o09
EKC 315A
Off Off On On
Off On Off On
Off On
Standby tempera-
Regulating
ture
Off On
No Yes
Yes Yes
Manual RS8CS302 © Danfoss 07-2005
Danfoss wil not be responsible for any goods, or plant compo-
nents, damaged as a result of the above defects. It is the installer's
responsibility to check the installation thoroughly, and to fit 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 2
Cable length for the TQ actuator
The actuator must be supplied with 24 V a.c. ± 10%.
To avoid excessive voltage loss in the cable to the actuator, use a
thicker cable for large distances.
Wire cross section
Appendix 4
If there are two evaporators sharing the same suction line, the
signal from the pressure transmitter can be used by two control-
lers.
Cable length
11