63
➎
➎a
➎b
© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR a/C UNITS
The corresponding commands:
You can set a minimum runtime for the compressor by a command. The mini-
mum runtime is entered in seconds.
Scroll compressors are equipped with an ASTP (advanced scroll temperature
protection), which consists of a mechanical protection against an excessive
hotgas temperature.
If the ASTP triggers, the compressor motor runs without compressing refriger-
ant (i.e. running idle). The ASTP is automatically reset.
To record this event in the event log, you must apply and configure a sensor for
the condensation pressure and another one for the evaporation pressure and
set values for the ASTP threshold and the ASTP hysteresis in the menu beside.
The ASTP threshold represents a pressure difference between the condensa-
tion pressure and the evaporation pressure. For R407C, in normal operation
this difference amounts to 10 - 12 bar (R410A → 15 - 25 bar).
If the pressure difference is smaller or equal to the ASTP threshold
➌, the event
„Compressor # ASTP“ is generated.
If the pressure difference rises to the value ASTP threshold + ASTP hysteresis
➍, the event „Compressor # no ASTP“ is generated.
The low pressure alarm can be managed in a way to avoid a premature and
unnecessary service intervention.
If the LP switch releases, the compressor is stopped and restarted after the
compressor pause has elapsed. The LP alarm is inhibited during the winter
start delay. This way the controller tries to bypass temporary LP alarms.
You can limit the number of compressor restarts in "RESTARTS"
➎ within a time
space you can adjust in the left column of the fifth line to avoid an LP alarm. You
can define the time space in the right column of the same line
➎b.
If after the maximum number of restarts, the LP switch still triggers, the LP
alarm is released and the compressor is definitely switched off. Using the
optional evaporation pressure sensor you can adjust in the medium column of
the same line a threshold
➎a which marks the lower limit for the permissible
pressure range.
comp 1 minruntime 300
comp 1 wac epmintries 6
comp 1 wac epmin 4.6
comp 1 wac epminint 2
.../more
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