Danfoss AK-CC 550A - Survey of functions - Part 4; Interval between defrost starts; Adaptive defrosting

18 Manual RS8FS402 © Danfoss 2016-03 AK-CC 550A
Interval between defrost starts
The function is zeroset and will start the timer function at each defrost start. When
the time has expired the function will start a defrost.
The function is used as a simple defrost start, or it may be used as a safeguard if the
normal signal fails to appear.
If master/slave defrost without clock function or without data communication is used,
the interval time will be used as max. time between defrosts.
If a defrost start via data communication does not take place, the interval time will be
used as max. time between defrosts.
When there is defrost with clock function or data communication, the interval time
must be set for a somewhat longer period of time than the planned one, as the
interval time will otherwise start a defrost which a little later will be followed by the
planned one.
In connection with power failure the interval time will be maintained, and when the
power returns the interval time will continue from the maintained value.
The interval time is not active when set to 0.
d03 Def Interval
(0=o)
Max. defrost duration
This setting is a safety time so that the defrost will be stopped if there has not already
been a stop based on temperature or via coordinated defrost.
(The setting is the defrost time if d10 is set to 0.)
d04 Max Def. time
Time staggering for defrost cut ins during start-up
The function is only relevant if you have several refrigeration appliances or groups
where you want the defrost to be staggered in relation to one another. The function is
furthermore only relevant if you have chosen defrost with interval start (d03).
The function delays the interval time d03 by the set number of minutes, but it only
does it once, and this at the very rst defrost taking place when voltage is connected
to the controller.
The function will be active after each and every power failure.
d05 Time Stagg.
Drip-o time
Here you set the time that is to elapse from a defrost and until the compressor is to
start again. (The time when water drips o the evaporator).
d06 DripO time
Delay of fan start after defrost
Here you set the time that is to elapse from compressor start after a defrost and until
the fan may start again. (The time when water is “tied” to the evaporator).
d07 FanStartDel
Fan start temperature
The fan may also be started a little earlier than mentioned under “Delay of fan start
after defrost”, if the defrost sensor S5 registers a lower value than the one set here.
d08 FanStartTemp
Fan cut in during defrost
Here you can set whether fan is to operate during defrost.
0: Stopped (Runs during pump down)
1: Running (stopped during "fan delay")
2: Running during pump down and defrost. After that stopped
d09 FanDuringDef
Defrost sensor
Here you dene the defrost sensor.
0: None, defrost is based on time
1: S5
2: S4
3: Sx. For application 1 to 8 and 10 defrosting is stopped when both S5 and S6 have
reached the set temperature (Both sensors must be located on the evaporator).
For application 9 defrosting is stopped individually on the two sections of S5 /
S5B
d10 DefStopSens.
Pumpdown delay
Set the time where the evaporator is emptied of refrigerant prior to the defrost.
d16 Pump dwn del.
Drain delay (only in connection with hotgas)
Set the time where the evaporator is emptied of condensed refrigerant after the
defrost.
d17 Drain del
Defrost on demand – aggregate refrigeration time
Set here is the refrigeration time allowed without defrosts. If the time is passed, a
defrost will be started.
With setting = 0 the function is cut out.
d18 MaxTherRunT
Delay on stop of heating in the drip tray
The time applies from the time the defrost stops by time or temperature to the time
the heating element in the drip tray needs to be disconnected.
d20 Drip Tray del
Adaptive defrosting
An adaptive defrosting is an extra defrost in addition to the scheduled defrosts or a
cancellation of a scheduled defrost.
Here the adaptive defrost is set for when it can come into operation if the need arises:
0: Never,
1: Never, but triggers an alarm in the case of icing up
2: Cancellation of day schedule is permitted. Night schedule is carried out
3: Cancellation of day schedule is permitted. Cancellation of night schedule is permit-
ted
4: All schedules are carried out + extra if it is registered that it is required.
(Reset: Temporary setting to 0 will reset the recorded values and start a new calcula-
tion of the evaporator air ow.)
d21 AD mode