Danfoss EKE 1C User Manual

1.
2.
3.
4.
5.
1.
2.
3.
4.
Figure 83: Minimum S4/leaving media
Danfoss 80G8232.01
°C
S3
S4
S4 min
T
S3
T
S4
R
p0
T
S2
EEV
Dan
foss
80G365.10
“Warm” brine / water
“Cooled” brine / water
Electric expansion valve
Time
Plate heat
exchanger
S4 min

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 45: Minimum S4/leaving media parameter table
Parameter
Function
Description
N126
Min. S4 mode
0 = O | 1 = ON
N127
Min. S4 setpoint
Minimum S4 (media outlet) protection setpoint
Priority of Protection features:
To overcome conicts between dierent limiters, a priority function is implemented as follows:
Superheat close (it is always important to avoid liquid back to the compressor)
LOP (Low operating pressure)
HCTP (High condensing temperature protection)
Min. S4 (Minimum S4 temperature)
MOP (Maximum operating pressure)
As an example, if the pressure is low and at the same time the superheat is low. LOP control would like to open the
valve to raise the pressure. but SH close will decrease the ow to regain a safe superheat. In this case the LOP
demand is overruled by SH close. So, in the end if the conict still is active the mechanical low-pressure switch will
need stop the compressor.
6.3.3 Manual Mode
In the manual mode, the user can select actions based on signals from digital inputs DI2/DI3. In the manual mode
we can use 4 dierent options:
Manual OD from preset parameter via DI
Manual control of Relay
Manual control Valve
Manual Homing

NOTE:
Too often use of Manual Homing could wear out the valve. For normal operation use overdriving feature.
Manual OD When DI 2 is congured as Preset OD, the valve OD will be positioned as dened by valve OD parameter
[I078 - Preset OD].
Table 46: Manual OD
Digital input
O022 DI2
conguration
2 = Preset OD
O037 DI3
conguration (only in
EKE 1A)
2 = Preset OD
Manual Preset via DI
078 Preset OD
desired Valve OD %
When manual mode becomes active, the state of alarm output will remain the same and be transferred to the
parameter(s) for Manual relay DO1. When manual mode becomes inactive the actual state of Manual relay DO1 will
be the starting point for the next mode.
© Danfoss | Climate Solutions | 2022.06 BC398828796060en-000101 | 57
Superheat controller, Type EKE 1A, 1B, 1C, 1D

Danfoss EKE 1C Specifications

General

Brand	Danfoss
Model	EKE 1C
Category	Controller
Language	English