Danfoss EKE 1A User Manual page 57

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Figure 73: High condensing temperature protection
Tc condenser
temperature
HCTP setpoint
SH
SH ref
 NOTE:
HCTP feature requires mounting pressure transducer Pc at compressor discharge line or getting its value via Bus
Table 51: High condensing temperature protection Parameters
Parameter Function
N133 High cond. temp. protection function
N134 High cond. temp. protection setpoint (converted from pressure
value from sensor Pc).
Minimum S4/leaving media (freeze protection)
This protection modes keeps the temperature of leaving media out of the evaporator (given by temperature sensor
S4) on or above of minimum temperature set by the user. This is achieved by lowering the ow 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 Temperature of leaving media goes above S4 min
Figure 74: Minimum S4/leaving media
S3
T
"Warm" brine / water
S4
T
"Cooled" brine / water
 NOTE:
An undershoot below the Min S4 is possible, so a frost protection is still needed to secure that the compressor is
stopped before the braze plate heater is destroyed by ice.
Table 52: Minimum S4/leaving media parameter table
Parameter
N126
N127
Priority of Protection features:
To overcome con icts between di erent limiters, a priority function is implemented as follows:
© Danfoss | Climate Solutions | 2024.08
If condenser is above HCTP
setpoint the massflow is
reduced giving less load on
condenser
During high condenser
temperature the SH will not
follow SH reference
p0 S2
R T
°C
S3
Plate heat
exchanger
S4
S4 min
S4 min
EEV
Electric expansion valve
Function
Min. S4 mode
Min. S4 setpoint
OD
Description
0 = O | 1 = ON
High condensing temperature protection setpoint unit is satura-
ted temperature in condenser.
Time
Description
0 = O | 1 = ON
Minimum S4 (media outlet) protection setpoint
BC398828796060en-000103 | 57