Danfoss EKC 202D User Manual

EKC 202D Manual RS8EE202 © Danfoss 08-2010 9
Defrost Defrost control
The controller contains a timer function that is zeroset after each defrost start.
The timer function will start a defrost if/when the interval time is passed.
The timer function starts when voltage is connected to the controller, but it is dis-
placed the rst time by the setting in d05.
If there is power failure the timer value will be saved and continue from here when
the power returns.
This timer function can be used as a simple way of starting defrosts, but it will always
act as safety defrost if one of the subsequent defrost starts is not received.
The controller also contains a real-time clock. By means of settings of this clock and
times for the required defrost times, defrost can be started at xed times of the day.
If there is a risk of power failure for periods longer than four hours, a battery module
should be mounted in the controller.
Defrost start can also be accomplished via data communication, via contact signals or
manual start-up.
All starting methods will function in the controller. The dierent functions have to be
set, so that defrosts do not ”come tumbling” one after the other.
Defrost can be accomplished with electricity, hotgas or brine.
The actual defrost will be stopped based on time or temperature with a signal from a
temperature sensor.
Defrost method
Here you set whether defrost is to be accomplished with electricity, gas, brine or
"non".
During defrost the defrost relay will be cut in.
(*) ”refrigeration relay” is active during defrost)
d01 Def. method
0 = non
1 = El
2 = Gas *)
3= Brine *)
Defrost stop temperature
The defrost is stopped at a given temperature which is measured with a sensor (the
sensor is dened in d10).
The temperature value is set.
d02 Def. Stop Temp
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.
d04 Max Def. time
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 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-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 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 another allowable value than the one
set here.
d08 FanStartTemp

Danfoss EKC 202D Specifications

General

Brand	Danfoss
Model	EKC 202D
Category	Controller
Language	English