Function of VS 300
33
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
ZNR. 51203
66 130 E0
t
0min
t
0 max
Room temperature t [°C]
Low-pressure control
r
-35
-30
-25
-20
-15
-10
-5
-0
0 5 10 15 20 25 30 35
t
r max
t
rmin
t
0
Suction pressure
VS 300 low pressure control
t
0_max
, t
0_min
, t
r_min
and t
r_max
can be parameterised. The air humidity can also be factored in.
The pressure setpoint for actual control is determined from a conversion table contained in the software.
Conversion of t
0
to the corresponding pressure can be made for the following refrigerants:
R22, R502, R134a, R404A, R402A, R717, R1270, R507, R407C, R410A, R290, R744 (transcritical operation
not available), R407F, R422A, R422D, R408A, R407D, R407A, R427A, R438A, R512a, R170, R600, R600a,
R449A, R450A, R448A, R455A, R447B, R1234ze, R1233zd, R41234yf
4.3.11 Second setpoint – Setpoint increase/decrease
A second characteristic can be programmed for low-pressure control and can be activated by the internal week
timer or via a digital input of the controller. Setpoint increase/decrease allows better matching to night and week
end operation. Setpoint toggle is performed for the following values:
S Target temperature(s)
S Neutral zone
S Control constant
The polarity of digital input signals can be programmed (low or high active).
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