Product Overview
Table Of Contents
© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 48
17.5 Delta temperature
reference
EKE 1A 1B 1C
Applicable
-
Note:
It is must to use media temp in
S3 sensor to enable this
feature.
It is only available on EKE 1B
and 1C.
Can only be used for air
cooled system with Finn and
tube evaporator.
With Delta temperature control function. it is it possible to regulate the superheat SH with extra
information such as evaporator pressure Pe and media temperature S3. Delta temperature is based on
the fact that most evaporators has a good eciency if the SH reference is set to be 0.65 multiplied by
temperature dierence from inlet temperature to evaporating temperature.
The advantage in using this regulation is that the the controller can regulate in a quicker response to
load changes.
The regulation senses the load situation and is much better to respond to changes such as cut in and
cut out of capacity steps, condenser fan steps and starting with empty or full evaporators.
SH reference is calculated as a ratio between the media temperature and evaporator temperature. This
reference mode is only possible if media temperature (S3) sensor is available.
Evaporator temperature is calculated by knowing pressure and refrigerant.
The behavior is dened by 2 parameters:
• SH reference mode: mode selector between the dierent SH reference modes
• SH ratio: SH reference = ratio* (S3-T0)
EEV
TT
P
S2
Danfoss
80G348.10
SH = S2 - T0
Where to use
Delta temperature is useful when big variations in inlet temperature can be foreseen (ex. Heat pumps
running on ambient air). Also variation in suction pressure due stage controlled compressor will be
compensated.
Parameter Function Description
R102 Operation mode 0 = SH Control
N021 SH reference mode 3 =Delta temp
N009 SH max. value
N010 SH min. value Note: Value must be >0.5K higher than SH close value ,if N117=1
N116 SH ref. delta temp factor
Note: this value should be between 0.4 and 0.1. Lower value may ood the
compressor where as higher values will result in low eciency
N117 SH close function 0 = O | 1 = On, default = 1
N119 SH close setpoint default value =2 K (recommended)
Danfoss
80G354.10