Doc No. 700070 Page 7 of 56
Suspending the heater - General
The first support is always positioned at the support lug
suspension point on the end vent burner combustion
chamber.
Subsequent supports are placed approximately 2.8m apart,
including one at each combustion chamber location. This
gives a maximum load per support of 24kg.
A support must always be located at a maximum distance
of 2m from a tee or elbow fitting.
Except for the combustion chamber support lug suspension
points, suspension support brackets are installed to support
the tube section which is then covered with reflectors.
Tail pipe hangers are installed for the tube section which
will be without reflectors.
If there are any doubts as to the strength or suitability of
roof steelwork to which heaters are to be suspended, please
refer to a Consultant, Architect or owner of the building.
The manifold should be supported by chain, stainless steel
flexible wire, or other flexible means from the roof
structure to allow movement caused by thermal
expansion. The maximum distance between supports is
1.5m for horizontal runs.
Wall bands are not load bearing and give lateral support
only. If used, wall bands should be fitted every 3m on
vertical runs to ensure the system is rigidly held. The system
should be braced immediately below passing through
the roof line to ensure the flashing does not suffer lateral
pressures.
Table 1. Minimum mounting heights
The recommended mounting heights for Nor-Ray-Vac ‘M’
heaters are given in the table below.
Recommended Mounting Height (m)
Model
Horizontal
NRV24M
4.0M
NRV32M
4.7M
NRV38M
5.7M
NRV46M
6.0M
fig. 1.a Overall dimensions
A
Burner Tube
B
Burner
C
Optional Perimeter Reflector
D
Side wall
