39
➌
➍
➎
➏
➐
➑
5 min.
S
fix
dS
S
var
a
b
© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR a/C UNITS
The corresponding commands:
Values
Air/Temperature
The controller offers the possibility to have start a standby unit when an
adjustable positive temperature difference to the air temperature setpoint is
achieved. This difference can be adjusted by the parameter "Overloadstart"
➌ .
The adjustment 0.0K disables this function.
When the temperature difference is obtained the A/C unit, so far as it is
defined as standby unit, will be started. The sequencing function is not influ-
enced by this. In order to use this function, a zone must be defined.
You can determine an integral factor
➍ for the air temperature control to avoid
a control discrepancy which is characteristic for P-controllers. In this case a
variable setpoint S
var, which is recalculated every 5 minutes is decisive for the
control. This variable setpoint is calculated by adding the setpoint alteration dS
to the previous setpoint.
The values for the integral factor can be varied between 0 and 10%. A low
value should be used to start with in order to prevent the control system from
oscillating. 2% are re commended and can stepwise be increased to find out
the limit of safe control.
actual value
time
Svar
n+1
= Svar
n
+ dS with
dS = (S
x - actual value ) x integral factor
sfix represents the fixed setpoint which is adjusted in the
menu Operate/values/air/temperature.
All combinations are possible.
Concerning the limit alarms "Room temperature too low ➎/too high ➏" and
Supply air temperature too low
➐/too high ➑" you can adjust:
a. common alarm release (1=yes).
b. alarm priority
load cool 2.5
integral 10
mintemp room
maxtemp room commonalarm 1
mintemp supply alarmprio 8
maxtemp supply
Config
Values/Air/Temperature
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