18 Installation of the cascade controller
48
99E13331xx-mub-en - V08
2022/07
1.
Remove the white front panel of the controller (1).
2.
Then, remove the strain reliefs (2).
3.
After that, remove the sensor cables of the VFS/US sensors, of the PWM signal and the
temperature sensors from the controller circuit board plug connector (3).
4.
In the next step, unscrew the two screws to remove the intermediate level (4).
5.
Remove the strain relief on the 230 V level (5). Now, connect the cascade valve to the
output relay 1. If also a three-way valve for the improved stratification control in the storage
tank (return stratification) must be connected, use the output relay 2 of the server 1. Use a
duo wire end ferrule (twin wire end ferrule) for the crimping if two wires are meant to be
mounted below one screw terminal. Please note that the polarity is established as shown in
the following illustration.
