85
➊
➋
➎
➊
➋
T/°C
© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR a/C UNITS
The corresponding commands:
Components/Cooling
Pump
The start temperature
➊ for the pump is entered as a positive difference to the
room temperature setpoint.
The corresponding hysteresis
➋ for the pump stop is only valid for pumps with
on/off-control as the glycol pump.
If the hysteresis is set zero, the pump is
switched on when a water request exists. The value for the start temperatur will
be ignored in this case.
G- or GCW unit
The pump is started and stopped depending on compressor operation.
With speed controlled compressors there may be an overruntime of compres-
sors after the unit has been stopped.
GE unit
Pump operation depends on G- and GE valve. It starts if at least one valve is
opened and stops when all valves are closed.
CW2 unit with DFC control
Pump operation depends on CW valve in the free cooling circuit (circuit 2).
CW unit (from version 6.78)
A pump which is configured in the C7000IOC is controlled depending on the
CW valve, although the chilled water is usually provided by a chiller which has
its own pumps.
The speed setpoint
➍ will only be used for the DFC control. For this a separate
manual (GE systems) exists.
Alarm parameter:
Alarm delay
➎
Glycol-pump
ON
OFF
setpoint
pump 1 start 0.1
pump 1 hys 0.7
pump 1 alarmdelay 6
Operate
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