Product Overview - Vaillant VWL Series Operating Instructions Manual

3.3

Product overview

3.3.1 Product design
6
5
4
1 Unit mounting bracket
2 Expansion vessel
3 Hydraulic block
0020291544_01 Hydraulic Station Installation and maintenance instructions
1
2
3
4 Electronics box with
control PCB
5 Control for the indoor
unit
6 Electronics box with
power supply PCB
Product description 3
3.3.2 Design of the hydraulic block
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9
8
7
6
1 Manometer
2 Expansion relief valve
3 Building circuit return
4 Building circuit flow
5 Domestic hot water
cylinder return
3.3.3 Underside of the product
1 Drain for expansion
relief valve
2 Building circuit return
3 Building circuit flow
4 Domestic hot water
cylinder flow
1
2
5 4 3
6 Domestic hot water
cylinder flow
7 Prioritising diverter
valve (heating cir-
cuit/cylinder charging)
8 Electric back-up heater
9 Safety cut-out
10 Automatic air vent
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2
3
4
5
6
7
5 Domestic hot water
cylinder return
6 Heating return, to the
heat pump
7 Heating flow, from the
heat pump
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