Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 47
17.3 Fixed reference Fixed reference is normally uses in systems where the load and the operating condition of the unit
is stable . This can also be used in systems that periodically on/o the unit in a short run time for
example process chiller that maintains the outlet media temperature to a specic set point .
Where to use:
This feature can be used where load conditions and operation is stable or can be use in those ON/OFF
units i.e short cycling operation condition
Parameter Function Description
R102 Operation mode 0 = SH Control
N021 SH reference mode 0 = Fixed Superheat
N107 SH max. value
This value corresponds to SH max. = SH min. Note: must be >0.5K higher than
SH close value, if N117=1
N117 SH min. value 0 = O | 1 = On, default = 1
N119 Stability default value =2 K (recommended)
EKE 1A 1B 1C
Applicable
17.4 Load AP
LoadAP will adjust reference to be higher if load is higher. Load is indicated by the OD of valve.
LoadAP is a kind of preprogrammed MSS curve. This method will give a robust SH reference and
can in many case be the best t for systems.
This form of regulation is similar to the thermostatic valve where the spring force can be adjusted to
keep the SH (superheat) in the stable region to the right of the curve.
The advantage over the thermostatic valve is that there are two settings to dene the operating curve.
Danfoss 84B1489.10
100
%
Superheat
Qo
Unstable region
(wet)
Min. SH Max. SH
10 %
90 %
Stable
region (dry)
Danfoss
LoadAP
Δ Temp = S3 - Te
EEV
TT
P
S2
Danfoss 80G348.10
Δ Temp = S3 - Te
In Load ap application, SH reference follows a dened curve as shown in the diagram. This two point
curve is dened by SH max and SH min. These two values must be selected in such a way that the
curve is situated between the MSS curve and the curve for average temperature dierence ΔTm
(temperature dierence between media temperature and evaporating temperature). Setting
example: SH close = 4, SH min = 6 and SH max =10 K.
This make the regulation more stable compare to MSS because it does not seek a usability as the
adaptive control does.
Where to use
LoadAP feature is advantageous compare to MSS in application having parallel evaporators with
common suction line because the loadAP controls the opening based on the actual amount of SH.
The MSS mode adjusts based on the SH above or below the setpoint.
Parameter Function Description
R102 Operation mode 0 = SH Control
N021 SH reference mode 1 = LoadAp
N009 SH max. value
SH max. denes the reference for OD between 90-100% SH max. must
greater than or equal to SH min.
N010 SH min. value
SH min denes the SH reference for OD between 0 and 10 %.
Note: SH min. value must be >0.5K higher than SH close value ,if N117=1
N117 SH close function 0 = O | 1 = On, default = 1
N119 SH close setpoint default value =2 K (recommended)
EKE 1A 1B 1C
Applicable