EKC 315A
Manual RS8CS302 © Danfoss 07-2005
11
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.
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 1
Interaction between internal and external start/stop functions
and active functions.
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
Cable length
Internal Start/stop
Off
Off
On
On
External Start/stop (DI)
Off
On
Off
On
Refrigeration (DO2)
Off
On
TQ actuator
Standby tempera-
ture
Regulating
Expansion valve relay
Off
On
Temperature monitoring
No
Yes
Sensor monitoring
Yes
Yes
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
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.