Stulz C7000 - Page 143

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© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR A/C UNITS
Differential temperature control according to return air
Return air temp.
Fan speed
Config/components/air/
fan/special/more
Setpoint (return air or supply air)
This variant of differential temperature control can be used for A/C units with EC fans (e.g. Cyber Air).
With this control the fan speed is proportionally controlled according to the deviation of the return air tempe-
rature from the start temperature. Start temperature = setpoint + DTC start. The proportional range is deter-
mined by the parameter "DTC range". The PID factors for the fan are not considered. This control can also be
used in combination with supply air control, the DTC start parameter should be set bigger then (ca. 7K).
The following settings are necessary:
1. The parameter "DTC type" must be set on "return air" (command:
fan 1 dtctype 1).
By typing the command:
fan 1 dtctype 3 you can set a special form of differencial temperature control
according to return air. In case of failure of the return air temperature sensor the fan speed is increased to
n
max
.
2. Setting of the parameter "DTC start" (can also be left on "0").
3. Setting of the parameter "DTC range"
fan 1 dtcstart 0,2
fan 1 dtcband 1
fan 1 min 70
fan 1 nmax 95
fan 1 dtctype 1