Stulz C7000 - Page 76

76
➊
➋
➌
➍
➎
➏
➐
➑
EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR A/C UNITS
The corresponding commands:
Components
Cooling/Conden. fan/more
The condenser fan speed is controlled by the condensation pressure.
You can set two setpoints for the condensation pressure in the menu "Ope-
rate/values/refrigerant". A setpoint for mixmode and another setpoint for DX
mode = summer mode.
As long as the condensation pressure is lower than
the setpoint, the condenser fan runs with minimum
speed.
By reaching the setpoint the control accordimg to
PID parameters begins.
In the second Config menu you can adjust the follo-
wing parameters:
➊. Proportional factor
➋. Integral factor
➌. Differential factor
The control cycle
➍ in which the fan speed is calculated can be adjusted in
seconds in the fourth line. The control swiftness is hereby determined.
To avoid a drastical change you can adjust a maximum control correction
➎ for
each control cycle.
Corresponding to the recommendation of the fan manufacturer a minimum
speed
➏ can be set in the sixth line.
The prerun time serves to avoid an accumulation of hot air at the condenser,
after a longer period of inactivity. When compressor operation is requested the
condenser fan starts and the compressor start is delayed by the pretime.
➐
The prerun speed is the speed by which the condenser fan runs during the pre-
run time.
➑
Condenser fan
speed
Minimum speed
time
Condensation
pressure
Setpoint
PID control
time
cond 1 pid cp 40
cond 1 pid ci 2
cond 1 pid cd 0
cond 1 concyc 1
cond 1 maxc 10
cond 1 min 10
cond 1 pretime 10
cond 1 prespeed 100
Config