Stulz C7000 - Page 142

142
➊
➋
➌
➍
DT/K
➊
➋
n
max
n
min
0 DT
0
DT
0
+ DT
t
➍
➌
EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR a/C UNITS
Fan control
Fan speed is controlled in dependance on the temperature difference
between return air and supply air temperature. A return air and a supply
air sensor is assigned to each fan. The control parameters which are set
for fan 1 are valid, however, for all three fans.
The control range can be subdivided into three sections, which are
defined by two adjustable parameters.
The parameter "DTC start" (DT
0
) ➊ marks the begin of PID control.
Below this temperature difference between return air and supply air the
fan runs with the speed n
min
.
If T
return air
- T
supply air
< DT
0
then n
fan
= n
min
The parameter "DTC range" (DT
t
) ➋ sets the range of the PID control.
Above the sum of start difference and gradient the fan runs with the
speed n
max
.
If T
return air
- T
supply air
> DT
0
+ DT
t
then n
fan
= n
max
Operate/Components/Air/
Fan
In the PID control zone, so if DT
0
< T
return air
- T
supply air
< DT
0
+ DT
t
the fan speed stays in the range between n
min
and n
max
.
Config/Components/Air/Fan/
General
Fan speed
Zone of
PID-control
Curve characteristic
with plain P-control
We recommend, not to use the following fan functions with the differen-
tial temperature control:
- reduction according to temperature
- reduction according to time
- dehumidification speed
- emergency operation
The parameter "DTC type" in the menu "Config/components/air/fan/
special/more" must be set on "difference".
Command: fan 1 dtctype 0
fan 1 dtcstart 10
fan 1 dtcband 5
fan 1 min 30
fan 1 nmax 95