Viessmann Vitodens 200-W B2HE, Technical Manual

Page: 66 / 156

Calculating the transferable heating output (examples)
The sub-mounting kit is equipped with an integral balancing valve.
This allows the flow rate via the plate heat exchanger to the regula-
ted heating circuit to be restricted as required.
The max. heating output that can be transferred via the plate heat
exchanger of the sub-mounting kit is 14 kW. To achieve balanced
flow rates between the regulated heating circuit (sub-mounting kit)
and the unregulated heating circuit (radiator heating circuit), the
pressure drop in the sub-mounting kit must be increased. The inte-
gral balancing valve is used for this purpose.
For accurate adjustment of the flow rates, a flow indicator (available
as an accessory) can be installed in the flow line of the unregulated
heating circuit. The nominal circulating water volume of the boiler
(see specification), minus the flow rate through the plate heat
exchanger of the sub-mounting kit, results in the flow rate of the
unregulated heating circuit.
Example:
Vitodens 200-W, 1.9 - 25 kW
■ Nominal circulating water volume at ΔT 20 K: 1076 l/h
■ Heating output for regulated heating circuit (assumed): 13 kW
■ Resulting flow rate, primary side, plate heat exchanger at ΔT 20 K:
560 l/h
■ Flow rate of unregulated heating circuit (to be adjusted via the bal-
ancing valve): 1076 l/h – 560 l/h = 516 l/h
Mounting frame
Mounting frame
For gas condensing system boiler
Part no. ZK04308
Comprising:
■ Fixings
■ Valves/fittings, heating flow/heating return
■ Boiler drain & fill valve
■ Air vent valve
■ Pressure gauge
■ Gas shut-off valve with thermally activated safety shut-off valve
Wall clearance 90 mm
Connections (male thread)
Gas shut-off valve R ¾
Heating flow/heating return R ¾
Mounting frame
For gas condensing system boiler
Part no. ZK04921
Comprising:
■ Fixings
■ Valves/fittings, heating flow/heating return with pipe bend
■ Boiler drain & fill valve
■ Air vent valve
■ Pressure gauge
■ Gas shut-off valve
Wall clearance 90 mm
Connections
Gas shut-off valve (male thread) R ¾
Heating flow/heating return (ex-
ternal diameter) Ø mm 20
Mounting frame
For gas condensing combi boiler
Part no. ZK04922
Comprising:
■ Fixings
■ Valves/fittings, heating flow/heating return
■ Valves/fittings, cold water/DHW
■ Boiler drain & fill valve
■ Air vent valve
■ Pressure gauge
■ Gas shut-off valve with thermally activated safety shut-off valve
Wall clearance 90 mm
Connections (male thread)
Gas shut-off valve R ¾
Heating flow/heating return R ¾
Cold water/DHW R ½
Installation accessories
(cont.)
66
VIESMANN
VITODENS
7
5853906