Design Information Regarding 13. 1 Snow Load And Wind Load Zones; Installation 13. 2 Distance From The Edge Of The Roof; Routing Pipework; Equipotential Bonding/Lightning Protection Of The Solar Thermal System - Viessmann VITOSOL 100-F SV Technical Manual

Design information regarding installation
13.1 Snow load and wind load zones
The collectors and the fixing system must be designed in such a way
that they can withstand any snow and wind loads that may occur.
EN 1991, 3/2003 and 4/2005, differentiates between various snow and
wind load zones for every country in Europe.
13.2 Distance from the edge of the roof
Observe the following for installation on pitched roofs:
■ If the distance from the top edge of the collector array to the ridge of
the roof is greater than 1 m, we recommend installing a snow guard.
Note
If structural verification is required in the case of roof integration with
flashing frame and side flashing, observe the deviation on
page 127.
■ Never install collectors close to roof overhangs where snow is likely
to slide off. If necessary, install a snow guard.
Note
The additional loads due to accumulated snow on collectors or snow
guards must be taken into account in the structural calculations for
the building.
Certain parts of the roof are subject to special requirements:
■ Corner area A: limited on two sides by the end of the roof
■ Edge area B: limited on one side by the end of the roof
See the figures below.
13

13.3 Routing pipework

During the design phase, ensure the pipes are installed descending
from the collector. This ensures better steam expulsion characteristics
in the solar thermal system as a whole in the event of stagnation. The
thermal load exerted on all system components is reduced (see
page 152).

13.4 Equipotential bonding/lightning protection of the solar thermal system

Connect the solar circuit pipework with an electrical conductor in the
lower part of the building in accordance with VDE [or local] regulations.
The integration of the collector system into a new or existing lightning
protection facility or the provision of local earthing must only be carried
out by authorised personnel, who should take the site conditions into
account.
VIESMANN
108
A
B
A
B
The minimum width (1 m) of corner and edge areas must be calculated
in accordance with DIN 1055 and must be observed.
Allow for increased wind turbulence in these areas.
Note
For the calculation of clearances on flat roofs, the Viessmann "SOL-
STAT" calculation program is available at www.viessmann.com.
Note
Snow and wind load information in this technical guide rules out instal-
lation of collectors in the corner and edge areas described.
VITOSOL