Stulz S-Klima C7000 User Manual page 37

1 (CW)
Are the conditions ful-
filled for a fault change-
over for dual-fluid units?
N
CW standby manager
active?
N J
nmaxCW(DF) nmax zone
Actual T
air
EMERGENCY START?
(Overload function)
Are the conditions for START
SPEED fulfilled?
Is there a dehumidification request
with DEH.SPEED speed reduc-
Does the unit run with UPS
SPEED speed reduction in UPS
operation?
Is a filter alarm pending and must
the speed be increased by the
filter offset?
Is the minimum speed
kept?
Can a RED. SPEED speed re-
duction be performed due to the
non-request of air conditioning
technology functions within the
RED. TIME?
BA C7000 for EC Tower | EN | 01-2019 | 1000755
Components/
fans (part 3) - Determining the speed
Cooling priority
2 (DX/EC tower)
Are the conditions ful-
filled for a fault change-
over for dual-fluid
units?
J
N
nmax
Parameter
settings:
nmax: 100 %
nmaxCW: 90 %
> T +
setpoint
10 %
20 %
tion?
30 %
10 %
60 %
50 %
The following decision processes are ran through by the
0 (GE)
controller when calculating the speed.
The output speed nmax or possibly nmaxCW(DF) for
dual-fluid units is chosen according to the cooling priority
and the conditions for a fault change-over. (For details on
cooling priority, see page 28)
Afterwards, 4 queries are performed, which result in
successive speed reductions (or increases) being carried
out. To conclude, checks are carried out into whether the
minimum speed is adhered to and whether the conditions
for the RED. SPEED are fulfilled, which can bypass the
minimum speed as an individual reduction.
Example 1:
n = nmax
Assumption: Condition not
OK
n = nmax =100 %
Assumption: Condition OK
n = 100 % - 10 %
n = 90 %
Assumption: Condition OK
n = 90 % - 20 % * 90 %
n = 72 %
Assumption: Condition OK
n = 72 % - 30 %
n = 42 %
Assumption: Condition OK
n = 42 % + 10 %
n = 52 %
Condition not OK
because n < 60 %
so n = 60 %
Condition not OK
because of dehumidification
n = 60 %
Key:
Example 2:
n = nmaxCW(DF)
Assumption: Condition not
OK
n = nmaxCW 90 %
Assumption: Condition OK
n = 90 % - 10 %
n = 80 %
Assumption: Condition not
OK
n = 80 %
Assumption: Condition not
OK
n = 80 %
Assumption: Condition OK
n = 80 % + 10 %
n = 90 %
Condition OK
so n = 90 %
Assumption: Condition OK
n = 90 % - 50 % * 90 %
n = 45 %
Yes
Next step
No
37