Stulz C7000 - Operation Modes for CW2 Units

130 EN/06.2019/G57 © STULZ GmbH – all rights reserved
C7000 INSTRUCTIONS fOR a/C UNITS
6.4 Operation modes for CW2 units
In the menu C2 you can choose between two operating modes:
1. Changeover operation (parameter "Mode" : Separate)
2. Additional operation (parameter "Mode" : Added)
3. DFC control with CW2 units (parameter "Mode" : DFC)
Description, see GE systems manual.
4. DTC control of CW valve 1 (parameter "Mode": DTC)
Changeover operation
If one or several of the following conditions are complied, CW valve 2
is opened and CW valve 1 will be closed to the "value at switching" :
1. A voltage is present at the digital input (menu C2, parameter
DIN), which was assigned to the GE/CW valve.
2. DP 1025 is written with value "1" by a BMS.
3. DP 1025 is written with value "1" by inputting "1" for the parame-
ter "CW2-changeover" in menu C4.
4. Water temperature in circuit 1 is higher than parameter "GE-off".
5. Water temperature in circuit 1 is higher than the air temperature
setpoint, in case the parameter "Close over SP" (menu C1) has
been set "1".
If none of the above listed conditions is true, the control is switched
back from CW valve 2 to CW valve 1. CW valve 2 will be completely
closed.
The changeover is displayed by the parameter "State" in the menu
C4 of the Config level and is output by a freely adjustable digital out-
put (menu C2, parameter DOUT).
If a dehumidification request exists, the active valve will be opened
100% to provide maximum cooling capacity for dehumidification.
Config/Components/Cooling/
Valves/GE/CW valve (C1)
../CW-control/more (C3)
../CW-control (C2)
Config/Values/Misc. data/more
(C4)