68
➄
➃
3
t/min
A
B
➏
➐
T/K
B
A
EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR A/C UNITS
The corresponding commands:
Start phase
After the compressor was started because the start temperature has been
reached, it first runs 3 minutes with a fixed speed of 50 revolutions / s (3000
rpm).
If actual temperature value < setpoint + start temperature
➏ - hysteresis ➐,
the compressor runs with minimum speed for an adjustable time lapse.
If actual temperature value > setpoint + start temperature - hysteresis,
PID-control for the compressor gets active.
With low thermal load, especially with supply air control it may happen that the
air temperature is so low after the initial stage, that the compressor would be
turned off again. To avoid such an on/off operation, you can adjust a time
➃, in
which the compressor runs with a fixed minimum speed (20 rev/s, 1200 rpm).
If the temperature is still too low at the end of the specified time, the compres-
sor is switched off. However, should the temperature rise within this time onto
the set point, PID control for the compressor is activated.
Dehumidification
For a dehumidification request, the speed of the compressor is increased and
is controlled in the range between "pmax" (upper limit) and "cmswd" (lower
limit).
low.
If actual temperature value < setpoint + start temperature
➏ - hysteresis ➐,
the compressor runs with minimum speed for an adjustable time lapse.
If actual temperature value > setpoint + start temperature - hysteresis,
PID-control for the compressor gets active.
To equally avoid an on/off pulsing you can adjust a time
➄, in which the com-
pressor runs with a fixed minimum speed.
Here also, the compressor is switched off when the temperature is still too low
at the end of the specified time and the PID control is enabled, if the tempera-
ture rises within the time onto the set point.
The compressor speed will never pass under minimum speed (20 rev/s,
1200 rpm) during PID control.
For each refrigerant circuit a high pressure alarm can be configured, see menu
Config/values/refrigerant/HP management.
By these commands you can limit the power of the speed
controlled compressor.
The minimum/maximum power is entered in %.
for the EC compressor you can set a minimum speed for
dehumidification.
Start speed
Min. speed
control range
PID control
SP
Maximum speed
control range
PID control
Maximum speed
Start speed
Min. speed
Start phase - temperature dependant
Start phase - time dependant
icc 1 lowafterdehumi 240
icc 1 pmin 19
icc 1 pmax 80
icc 1 cmswd 20
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