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APC INROOM ACPSC3000 Provozní pokyny Strana 77

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77InRoom Controller - Operating Instructions
➑
➒
n > f • ( )
100
100 - nMax
Q5
Display
Service
The corresponding commands:
The numbered callouts refer to the corres-
ponding passages in the descriptive text.
nMax / %
n - units
f = 1 f = 2 f = 3
60 3 5 8
65 3 6 9
70 4 7 10
75 4 8 12
80 5 10 15
85 7 14 20
90 10 20 30
2. CW Standby Management
The CW standby management can be car-
ried out with CW units and Dualfluid units
with CW cooling priority. The basic idea is
to share the heat load permanently with as
many units as possible in order to reduce
the fan speed of all units and thus to save
energy. As a result, the provided standby
units must constantly take part in the cooling
process. The total airflow is below the maxi
-
mum airflow possible and is equalled in case
of failure of one or more units by increasing
the fanspeed of the remaining units.
Use "MAXFANSPEED"
➑ to adjust the fan speed which is to be kept in the zone
when all units are running. Use CW-ENERGY-SAVE
➒ to enable the CW-standby
management and to turn on all standby units of the zone. Both parameters are
related to the zone and only need to be adjusted at one unit of the zone.
The table beside displays how many units in
a zone are necessary to keep the total airflow
at the indicated fan speed in the left column,
when "f" units have failed.
This correlation is represented by the follo
-
wing formula.
A cooling unit is switched off as a defective unit if a valid alarm occurs at this unit,
in the same way as in the sequencing.
When a Dualfluid unit changes over to DX operation due to a fault like a water
temperature exceeding the GE-off limit (see page 71), this unit applies the nMaxDX
fan speed which is higher than the MAXFANSPEED of the CW standby manage
-
ment.
The fan speed of the other units is not affected by this.
zone 1 nmax 85
zone 1 cwmode 1
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