Viessmann VITODENS 242-F Technical Manual page 43

Installation accessories
Residual head of the integral circulation pump for the heating circuit with mixer
600 60
500 50
400 40
300 30
200 20
100 10
0 0
0 100 200
Flow rate in l/h
Calculating the transferable heating output (examples)
A maximum heating output of 14 kW can be transferred via the plate
heat exchanger in the assembly kit. To achieve balanced flow rates
between the regulated heating circuit (assembly kit) and the unregu-
lated heating circuit (radiator heating circuit), the pressure drop in the
assembly kit must be increased.
For this, the line regulating valve with flow indicator available as an
accessory can be fitted to the primary side of the plate heat exchanger,
i.e. between the flow and return. The nominal circulation water volume
of the boiler (see specification), minus the flow rate through the plate
heat exchanger in the assembly kit, results in the flow rate of the
unregulated heating circuit.
Example:
Vitodens 242-F, 5.2 -26 kW
■ Nominal amount of circulation water at ΔT 20 K: 1018 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 ≙ 9.3 l/min (to be set via the line regulating valve)
■ Flow rate of the unregulated heating circuit: 1018 l/h – 560 l/h =
458 l/h
Connection set for DHW circulation pump
Part no. 7514 916
For installation in the Vitodens
Comprising:
■ High efficiency circulation pump
■ Flow regulating valve
■ Pipe assembly with thermal insulation
Note
An additional AM1 or EA1 extension is required for connection to the
Vitotronic.
Safety assembly to DIN 1988
DN 15
VITODENS
(cont.)
Min.
300 400 500 600 700 800 900 1000 1100 1200
Comprising:
■ Shut-off valve
■ Non-return valve and test connector
■ Pressure gauge (part no. 7219 722 and 7265 023)
or
Pressure gauge connector (part no. 7351 842 and 7351 840)
■ Diaphragm safety valve
For on-site installation on finished walls
■ 10 bar (1 MPa)
Part no. 7219 722
■ a 6 bar (0.6 MPa)
Part no. 7265 023
For installation on unfinished walls in conjunction with the con-
nection set
■ 10 bar (1 MPa)
Part no. 7351 842
■ a 6 bar (0.6 MPa)
Part no. 7351 840
Valve/fittings cover
Part no. 7352 257
For connection set for installation on unfinished walls
Not for use in conjunction with filling facility
Max.
1300 1400
VIESMANN
5
43