Technical data

2. Installation ProCon HT 150 / HT 225
2.8 Electrical connection
Caution 230 V:
Make sure all electrical components are disconnected.
Follow the applicable VDE regulations .
The electrical connection must be checked by an
electrical specialist before connecting to the mains.
To make electrical connections, there is a terminal block on the back of the boiler .
The terminal block is protected with a cover plate against direct
contact. Remove the cover plate first . Install the cables on the
on the back of the appliance and connect them to the t erminal
block. After successful connection, replace cover plate.
Connect the sensor line, the external h eating circuit pump, the
domestic water charge pump and where necessary, L P B bus or
H1 pin directly to the t erminal block on the back of the boiler .
Fig 12: Terminal block for electrical connections
Fig 13: Terminal block layout for electrical connections
Legend: RU = Room unit
H1 = H1 Input (external switch contact )
BW = Domestic water temperature sensor
AF = Outdoor temperature sensor
BUS = Local Process Bus (LPB)
BW = Domestic water charge pump
HK = Heating circuit pump
N = Mains ground connection
L = Phas e mains connection
• H1 Input
Terminal H1 is an input that has a different function depending
on the selected setting. The terminal is open when the input is
not in use .
There are four functions available :
- Operation mode switch by phone e.g. for a vacation home)
- Minimum temperature requirement
- Generator lock
- Heat request
The functions of H1 input are described in detail in MBW RVA
47.320 instruction manual included in the scope of delivery .
• Domestic water temperature sensor
The storage tank sensor line is connected with a two-core cable
(interchangeable ) to the DW terminal . For resistance values, see
diagrams in Chap 7.2.
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