Stulz C7000 - Page 74

74
➊
➋
➌
➍
➎
➏
➐
➑
➒a
➒b
EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR A/C UNITS
The corresponding commands:
Components/Cooling/Valves
HGBP-valve
In the first line you add the HGBP-valve to the configuration by entering "1".
With "0" you disable the valve.
➊
With the parameter "AOUT" you adjust the analog output of the proportional
signal for the HGBP-valve.
➋
The opening degree of the HGBP valve is controlled according to the air tem-
perature. If the actual temperature is below the setpoint, the opening degree
rises to the adjustable maximum opening degree. If the actual temperature
is above the setpoint, the opening degree falls to the adjustable minimum
opening degree.
A proportional factor
➍, an integral factor ➎ and a differential factor ➏ can be
adjusted for the precise control. In the third line you can adjust the control cycle
➌.
The pre-runtime serves to softstart the compressor. When compressor opera-
tion is requested, the HGBP valve opens and the compressor start is delayed
by the pre-runtime.
➐
The pre-opening is the valve opening degree to which the valve is opened
during the pre-runtime.
➑
In the last line you can set a minimum and a maximum opening for the HGBP
valve. The minimum opening
➒a limits the cooling capacity. The maximum
opening
➒b avoids a 100% short circuit of the refrigerant flow in case of a fully
opened HGBP valve. The compressor would operate in short circuit and trigger
an HP alarm.
In case of a dehumidification request the HGBP valve is instantly closed in
order to keep a 100% refrigerant mass flow available.
The maximum refrigerant mass flow is needed for the effect of passing under
the dew point by partial cut-off of the evaporator (Mini-Space without EC fan)
but also for fan speed reduction and dehumidification by the EEV (CyberAir
2/3).
Note for MiniSpace units
A/C units of the MiniSpace series are equipped with a mechanically controlled
HGBP valve (if this option has been selected).
For correct function the solenoid valve in the HGBP line must be configured,
see description for menu Config/dehumidification.
hgbp 1 conf 1
hgbp 1 aout 4
hgbp 1 concyc 3
hgbp 1 pfact 5
hgbp 1 ifact 5
hgbp 1 dfact 5
hgbp 1 pretime 10
hgbp 1 preopen 40
hgbp 1 min 20
hgbp 1 max 80
Config