Danfoss EKC 202 Manual page 10

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 inter-
val 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.
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 will be the defrost time if d10 is selected to be 0)
Time staggering for defrost cutins 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 first defrost taking place when voltage is connected to the controller.
The function will be active after each and every power failure.
Drip-off 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 off the evaporator).
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).
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 another allowable value than the one set here.
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
Defrost sensor
Here you define the defrost sensor.
0: None, defrost is based on time
1: S5
2: Sair
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.
Defrost on demand – S5 temperature
The controller will follow the effectivity of the evaporator, and via internal calculations and
measurements of the S5 temperature it will be able to start a defrost when the variation of the
S5 temperature becomes larger than required.
Here you set how large a slide of the S5 temperature can be allowed. When the value is passed,
a defrost will start.
The function can only be used in 1:1 systems when the evaporating temperature will become
lower to ensure that the air temperature will be maintained. In central systems the function
must be cut out.
With setting = 20 the function is cut out
If you wish to see the temperature at the S5 sensor, push the controller's lowermost button.
If you wish to start an extra defrost, push the controller's lowermost button for four seconds.
You can stop an ongoing defrost in the same way
10 Manual RS8DZ602 © Danfoss 08-2010
d03 Def Interval
(0=off )
d04 Max Def. time
d05 Time Stagg.
d06 DripOff time
d07 FanStartDel
d08 FanStartTemp
d09 FanDuringDef
d10 DefStopSens.
d18 MaxTherRunT
d19 CutoutS5Dif.
Defrost temp.
Def Start
Here you can start a manual defrost.
Hold After Def
Shows ON when the controller is
operating with coordinated defrost.
Defrost State
Status on defrost
1= pump down / defrost
EKC 202