Specifications

72 RK0YG302 © Danfoss 05/2007
Application
Here is a survey of the controller’s eld of application.
A setting will dene the relay outputs so that the controller’s inter-
face will be targetted to the chosen application.
Refrigeration control with one compressor
The functions are adapted to small refrigeration systems which
either may be refrigeration appliances or coldrooms.
The three relays can control the refrigeration, the defrost and the
fans, and the fourth relay can be used for either alarm function,
light control or rail heat control
• The alarm function can be linked up with a contact function
from a door switch. If the door remains open longer than al-
lowed there will be an alarm.
• The light control can also be linked up with a contact function
from a door switch. An open door will switch on the light and
it will remain lit for two minutes after the door has been closed
again.
• The rail heat function can be used in refrigeration or freezing
appliances or on the door’s heating element for frostrooms.
The fans can be stopped during defrost and they may also follow
a door switch’s open/close situation.
There are several other functions for the alarm function as well
as the light control, rail heat control and fans. Please refer to the
respective settings.
Hot gas defrost
This type of connection can be used on systems with hotgas
defrost, but only in small systems in, say, supermarkets – the
functional content has not been adapted to systems with large
charges. Relay 1’s change-over function can be used by the
bypass valve and/or the hotgas valve.
Relay 2 is used for refrigeration.
Must not be used together with PMLX and GPLX valves, unless a
time delay relay is installed, which ensures that the PMLX/GPLX
valve is closed completely before the hotgas is turned on.
1
2
3
4
S3 and S4 are temperature sensors. The application will determine
whether either one or the other or both sensors are to be used.
S3 is placed in the air ow before the evaporator. S4 after the
evaporator.
A percentage setting will determine according to what the control
is to be based. S5 is a defrost sensor and is placed on the evapora-
tor.
DI1 and DI2 are contact functions that can be used for one of the
following functions: door function, alarm function, defrost start,
external main switch, night operation, change of thermostat
reference, appliance cleaning, forced refrigeration or coordinated
defrost. See the functions in settings o02 and o37.
AK-CC 210