Stulz C7000 - Cooling Water Circuit, Internal Components

77
➊
➋
➌
➍
➎
➏
➐
© STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR a/C UNITS
The corresponding commands:
Components/Cooling/Valves
G-valve
In the first line you add the G-valve to the configuration by entering "1". With "0"
you disable the G-valve.
➊
With the parameter "AOUT" you adjust the analog output of the proportional
signal for the G-valve.
➋
The pre-start serves to provide a sufficient flow for the heat absorbing medium
and to pre-cool the heat absorbing medium. When compressor operation is
requested, the G-valve opens and the compressor start is delayed by the pre-
start time.
➌
The pre-open value is the G-valve opening degree which should be obtained
during the pre-start time.
➍
The setpoint for the valve opening is entered in the fifth line. ➎ This setpoint is
relevant for DFC control only. The DFC control is described in the manual "GE
systems".
In the sixth line you can set a value for the valve opening
➏, which will be kept
during the sequencing stop in order to maintain a constant cooling water flow.
This measure avoids warming up the cooling water to ambient temperature.
In the seventh line you can set a start voltage
➐, which will be output on the
analog output. This voltage at least must be applied at the actuator so that the
actuator begins to move. It is the lower limit of the control voltage. This value
must be determined from the technical data of the actuator. The valve is still
closed when this voltage is applied. The maximum output voltage continues to
be 10V and corresponds to an opening of 100%.
5.4.4 Cooling water circuit, internal components
gvalve 1 conf 1
gvalve 1 aout 4
gvalve 1 pretime 30
gvalve 1 preopen 100
gvalve 1 opensp 70
gvalve 1 ows 31
gvalve 1 bias 1.4
Config