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RS8HP102 © Danfoss 2018-09
AK-CC 750A
Configuration - continued
1. Go to Configuration menu
2. Select Defrost function
3. Set functions
Definition of defrost functions
Example:
The settings are shown here in the
display.
If the controller’s internal defrost
schedule is used to start defrost,
the start times must be set using
the everyday user interface. See
page 65.
3 -
Defrost control
Select whether you want the controller to control defrost.
Defrost type
Choose a defrost method (electric / natural / hot gas or warm
brine)
Adaptive defrost
The function can be set to: "Not used"/"Monitor ice"/"Permit
cancellation of defrost for day (Skip day)"/"Skip day/
night"/"Full adaptive defrost".
Min. time between defrosts
Set how often defrosting is allowed.
Pc signal for AD (Adaptive defrost)
Choose which signal is to be followed: an internal signal (Lo-
cal) or a signal via data communications (Network).
Defrost schedule
Choose which schedule is to be followed: an internal sched-
ule or an external schedule from the system unit
Defrost start via DI
Select whether defrost should start when a signal is received
on a DI input
Max. defrost interval between defrosts
Defrost is started at the set interval if it is not started using
other methods (manual start, weekly schedule, network, DI).
If defrost is started using a schedule, “Max. interval” should be
set to a value greater than the longest period between two
defrosts in the schedule.
Fan run during defrost
Specify whether the fans should be on during defrost.
Defrost stop method
Define whether defrost is to be concluded with:
• Time, Temperature individual in each section or Tempera-
ture common for all sections
Defrost term sensor
Select the sensor that you want to give the signal for defrost
stop
Stop temperature A, B, C, D
Set the temperature at which defrost should stop
Max. defrost time
Defrost will stop after this period, even if the defrost tem-
perature has not been reached
Min. defrost time
Defrosting
cannot
be stopped until the set time has expired.
The setting has higher priority than "Max. defrost time"
Pump down delay
Time delay before defrost when the fluid injection stops and
the evaporator is emptied of liquid
Hot gas delay
Delay time before opening of hot gas valve
Drip off delay
Time delay after defrost to allow water droplets to drip off
the evaporator before refrigeration is restarted
Drain delay
Delay in which the drain valve is kept open in order to ensure
pressure equalisation
Fan delay
Maximum permitted fan delay following defrost
Fan start temperature
The fans will start when the temperature at the defrost sen-
sor falls below this value.
Drip tray heater
Set whether there is to be heating in the drip tray
Drip tray heater delay
Set heating time (time from the point at which defrost stops )
Max. Hold time
Maximum hold time that the controller will wait for the signal
to restart refrigeration (used with coordinated defrost)
Show advanced adaptive defrost
All settings for this function are expert settings.
Note!
If the injection is controlled with a analog signal to a 3rd
party valve the setting "Adaptive defrost" is not recom-
mended.
