Stulz C7000 - Page 65

65
➊
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© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR a/C UNITS
The corresponding commands:
Values/Miscellaneous Data
For A/C units with EC compressor (ICC) and two refrigerant circuits a quick
start function
➊ can be set.
The enabled quick start function is effective for on/off compressors after
the unit start immediately after switching on the operating voltage (also for
restart after power failure). (not for removal of a stop condition, e.g. local stop,
sequencing stop etc.).
Description of the quick start function:
Independent from the EC compressor start, also the on/off compressor(s)
of the second refrigerant circuit is(are) started according to its (their) start
value(s) and stopped according to its (their) hysteresis value(s), to achieve a
high cooling capacity fast.
Once the EC compressor (ICC) has completed its start-up phase, the on/
off compressors are started and stopped again in dependency of the EC
compressor.
The quick start function has priority over the compressor start delay that is
described in the following.
For units with free cooling a compressor start delay
➋ can be set.
The compressor start delay is effective for all compressors after the unit start
immediately after switching on the operating voltage (also for restart after
power failure). (not for removal of a stop condition, e.g. local stop, sequencing
stop etc.), if free cooling is possible.
In this way, the controller tries to avoid a compressor start and to achieve a
cooling by water instead.
It is also possible to block the start of on/off compressors by a digital input.
The digital input can be adjusted via the following command:
Compressor characteristics at unit start
dxstart quickstart 1
dxstart delaybyfc 180
comp 1 blockdin 9
Config