131 © STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR A/C UNITS
Additional operation
During additional operation both CW valves can be opened simultaneously. The PID parameters for both val-
ves can be differently set (menu C1).
If one or several of the following conditions are complied, the start temperatures of both valves are swapped:
1. A voltage is present at the digital input (menu C2, parameter DIN), 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 parameter "CW2-changeover" in menu C4.
4. Water temperature in circuit 1 is higher than parameter "GE-off". Valve 1 will be closed to the "value at swit-
ching" in this case.
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". Valve 1 will be closed to the "value at switching" in this case.
If condition 4 or 5 applies to circuit 2, the valve 2 is completely closed.
If none of the above listed conditions is true, the start temperatures of both valves are changed back.
The changeover is displayed by the parameter "State" in the menu C4 of the Config level and is output by a
freely adjustable digital output (menu C2, parameter DOUT).
If a dehumidification request and no condition for a swap of start temperatures exists, valve 1 is opened
100% to provide maximum cooling capacity for dehumidification.
If a dehumidification request and a condition for a swap of start temperatures exist, valve 2 is opened 100%
NOTICE
Using 2-way valves, the conditions 4 and 5 for the changeover must be avoided. This
can be achieved by setting the "GE-off" parameter sufficiently high and by setting
the parameter "Close over SP" to 0.
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