Danfoss EKE 1A User Manual page 55

Superheat controller, Type EKE 1A, 1B, 1C, 1D
Figure 79: Lowest Operating
Compressor
start
Outdoor
temp
Lop setpoint
Table 42: Lowest Operating Pressure (LOP) Parameters
Parameter
N140
N141
N142
N131
Maximum Operating Pressure (MOP)
Maximum Operating Pressure (MOP) will make sure that the evaporating pressure (P0) is kept below the MOP
setpoint set by the user. This is achieved by lowering the flow in the expansion valve. When this mode is active this
Super heat reference will be higher, the controller will switch back to superheat control once the pressure Po is kept
on the MOP setpoint.This feature is helpful especially during startup During startup and pulldown to avoid overload
of the compressor.
Figure 80: Maximum Operating Pressure (MOP)
Temperature
re
© Danfoss | Climate Solutions | 2022.06
Valve is opening to
avoid Te going lower
Te evaporator temperature
OD
Superheat
Function
LOP function
LOP setpoint °C
LOP priority mode
LOP max. time
Room Temperature
temperature
Room temperature
Description
0 = Off | 1 = On, default Valve = Off
Lowest Operating Pressure setpoint.
Setpoint unit is saturated temperature in evaporator
In case of conflict between low pressure and SH close, LOP function can be set to
override SH close actions. (Could be needed for startup in low ambient tempera-
tures)
On: LOP can override low superheat
0 = Off | 1 = On, default= Of
 WARNING:
As default, controller will not be allowed to open the valve when the superheat is
low. If such feature is needed for a short time, parameter" N142 LOP priority
mode" can be set to ON. This will allow LOP to have higher priority than bringing
the superheat out of low superheat for the time defined in" N131 LOP max. time".
 WARNING:
A specialCare should be taking that compressor can handle this condition.
Maximum time for LOP to override SH close
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