Viessmann VITODENS 242-F Technical Manual page 28

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
Flow rate in l/h
Calculating the transferable heating output (examples)
The maximum heating output that can be transferred via the plate
heat exchanger of the assembly kit is 14 kW. For 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.
4
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 of the assembly kit, results in the
flow rate of the unregulated heating circuit.
Example:
Vitodens 222-F, 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. 7514306
For installation in the appliance
Components:
■ High efficiency circulation pump
■ Flow regulating valve
■ Pipe assembly with thermal insulation
Connection R ½ (male thread)
VIESMANN
28
(cont.)
Min.
200 300 400 500 600 700 800 900 1000 1100 1200
Note
Vitodens with loading cylinder or solar cylinder also requires an AM1
or EA1 extension for connection to the Vitotronic.
Safety assembly to DIN 1988
DN 15
Components:
■ Shut-off valve
■ Non-return valve and test connector
■ Pressure gauge
■ Diaphragm safety valve
For on-site installation on finished walls
■ 10 bar (1.0 MPa)
Part no. 7219722
■ a 6 bar (0.6 MPa)
Part no. 7265023
For installation on unfinished walls in conjunction with the con-
nection set
■ 10 bar (1.0 MPa)
Part no. 7351842
■ a 6 bar (0.6 MPa)
Part no. 7351840
Valve/fittings cover
Part no. 7352257
For connection set for installation on unfinished walls
Not for use in conjunction with filling facility
Max.
1300 1400
VITODENS