Adaptive method (with compatible Danfoss evaporator
controllers)
Adaptive rail heat is a feature that groups together a collection
of compatible evaporator controllers that receive signals of
the current calculated dew point from an installed dew point /
temperature sensor. The installed humidity / temperature sensor
connects to the AK-SM (via I/O) and the resulting calculated dew
point value is sent to the connected evaporator controllers. By
controlling rail heat according to the actual dew point measured
in the store, significant energy savings can be achieved. The
following section highlights how to configure active rail heat via
the Danfoss AK-CC550 evaporator controller (which has the ability
to utilize calculated dew point over the communications bus).
Select ‘Yes’ to the question line ‘Use Adaptive Rail heat’, and (in
this example) select ‘
Calculated Dewpoint
’ as the dewpoint
method. Upon answering these questions the AK-SM will
automatically build sensor points to allow for the humidity and
temperature sensors to be defined. As the diagram below shows,
the EMHS3-1 sensor has humidity and temperature wired in to an
AK I/O module, the points at which these sensors are connected
can then be added under the sensor page (Configuration-
>Control->Refrigeration-Addresses)
EMHS3-1 Humidity &
Temperature sensor
Rail Heat Relay
AK I/O modules
Controller bus
Calculated Dew point
sent to controllers on bus
Rail Heat Relay
When using the EMHS3-1 sensor the humidity &
temperature output will be connected to AK I/O.
Use the ‘Addresses’ tab to locate the sensor sub-
tab, where the appropriate board & point can be
set (in line with the physical connections on the
AK I/O)
01-1.3
01-1.4
38
User Guide
Lit. no.
USCO.PI.R1.E1.02 © Danfoss 07-2013
AK-SM
850