Data Sheet for Product

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Siemens Superheat Controller CE1N3372en_02
Smart Infrastrucutre 2022-02-16
Liquid cooler (shell-and-tube heat exchanger)
Parameter code
old
new
ΔT XP
30 K
30 K * 1,25 = 38 K
ΔT TN
65 s
65 s
MOP XP
20 k
50 K / 20K = 2,5 > 0,75
→ 50 K / 0,75 = 67 K or higher
MOP TN
40 s
40 s
[%] Valve Opening Degree (VO)
Time
[S]VD
Control Mode
VT
VO
Capacity control is accomplished by increasing the superheat. For this reason, a
reduction in capacity is always associated with a drop in the evaporation tempera-
ture. In the case of chillers with no frost protection additives or direct expansion air
coolers, there is thus a risk of icing under part load conditions.
In simulation mode, the valve can be opened for service purposes. The position
feedback signal and the values of pressure and temperature can be displayed.
Function
Parameter
Function-
Code
Factory
setting
Selectable
Range / step
Valve
manual valve opening
MAN EIV
0 V
0...10 V / 0.1 V
In simulation mode, the supervisory functions are active only if the operational sta-
tus signal D1 is present. For safety reasons, the normal control mode is automati-
cally resumed after 15 minutes.
At this mode a variable opening of the electronic injection valve can be enforced.
The default value is 5 V, which complies with a valve opening degree of 50 % and
allows a manual entering of any value between 0 and 10 V (increment 0.1 V).
In this mode, all current input and output variables of the superheat and capacity
control can be displayed.
Example
Icing
Simulation mode
[SIMU]
Parameter list
Important
Regulation mode