Stulz C7000 - Page 90

90
➊
➋
➌
➍a
➍b
➎
➏a
➏b
t/sec
➌
%
100
90
nMax
80
70
65
55
t/sec
➋
➊
100%
nmax
➐
EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR A/C UNITS
The corresponding commands:
Components/Air
Fan/special
With the parameter "START 100%"
➊ you adjust a time which must elapse
before the fan control begins. This way an airflow alarm is avoided which
could occur due to the fan inertia. During this time the fan is operated with
100% speed.
By the "PRERUN" parameter
➋ you adjust the delay for the inhibited start of
all components, except the glycol pump, in relation to the control start with
alarm monitoring. By different pre-runtimes for different units it is avoided
that the most current consuming components start simultaneously and over-
charge the power supply of the building.
The fan over-run time
➌, which you can adjust, serves to reject hot or cold air
in the A/C unit and avoids an accumulation of heat at the reheat or of cold at
the evaporator.
The over-run time begins, after all compressors are shut down.
If during a time which you adjust with "REDUCE TIME"
➍a no action (cooling,
heating, humidification, dehumidification) has been taken, the fan speed is
reduced by the percentage which you adjust with "REDUCE SPEED"
➍b.
The "FILTER OFFSET"
➎ is entered as a positive difference to the maximum
speed. If a filter alarm is released, the maximum speed will be increased by
the filter offset in order to overcome the higher resistance of a clogged filter.
If during the time until the dehumidification reduction comes into effect
➏a
a dehumidification request exists, the dehumidification is carried out by fan
speed reduction. This time delay allows to control the humidity by a dehumi-
dification by the expansion valve in the meantime. For units without electrical
expansion valve this parameter should be set to "0".
The "DEHUM.SPEED"
➏b is entered as a negative difference in % to the
maximum speed. This is the fan speed for the first way of dehumidification.
The "UPS SPEED"
➐ is also entered as a negative difference in % to the
maximum speed. Receiving a UPS-signal the controller will apply this reduced
speed for an emergency operation.
control
start
compon.
start*
fan
start
* start of all other control-relevant compo-
nents except the glycol pump, which can be
started earlier.
unit stop
Fan stop phase
fan stop
over-run due
to fan inertia
Filter offset
➎
Offset *
Reduced speed
➍b
Dehumidif. speed
➏b
UPS speed ➐
*this item refers to the previous page.
Speed levels
Fan start phase
fan 1 100 5
fan 1 pre 15
fan 1 after 20
fan 1 redtime 30
fan 1 redspeed 20
fan 1 filteroffset 15
fan 1 dehumtime 26
fan 1 dehum 25
fan 1 ups 35
Config