Minimum Clearances - Viessmann VITODENS 242-F Technical Manual

Design information
Rated heat input
kW
24.7
30.5
34.9
Sizing recommendation, gas flow switch
In supply areas with H
IB
pliant with category I , determine a fictitious rated heat input. This
2N
fictitious rated heat input results from the rated heat input (Q
the appliance, multiplied by a factor of 1.14 (ratio H
this fictitious rated heat input to select the gas flow switch and
design the pipework to TRGI 2008 [or local regulations].

Minimum clearances

■ Space required in front of the Vitodens for maintenance:
Min. 700 mm
■ No maintenance clearances are required to the left or right of the
Vitodens.
■ In order to ensure a contact-proof design in accordance with the
Low Voltage Directive, install the boiler with its back flush to the
wall.
5
VIESMANN
46
(cont.)
Gas type Supply values
m 3
Natural gas E 2.61
Natural gas LL 3.04
LPG
Natural gas E 3.23
Natural gas LL 3.75
LPG
Natural gas E 3.86
Natural gas LL 4.49
LPG
below 8.6 kWh/m 3 and gas appliances com-
8.6/7.55). Use
IB
/h kg/h
1.93
2.38
2.85
Rated heating output
kW
11 to 19
) of
NB
26
35
The sizing recommendation for the gas flow switch does not negate
the requirement for sizing the pipework correctly.
Nominal diameter of the gas supply
pipe
DN 15 DN 20 DN 25
Max. possible pipe length in m
6 28 91
4 21 68
36 156 –
4 21 68
– 16 53
23 100 –
4 21 68
– 16 53
23 100 –
Gas flow switch
For natural gas
GS 4
GS 6
GS 10
VITODENS