Instruction manual

4
1.3 Heater Suspension
1.3.1 First considerations
• Clearances from combustibles must be
maintained. (See figure 2)
• For ease of servicing there should be a
minimum clearance distance of 500mm
between the burners of the heating system
and the building wall. This measurement
can be reduced for perimeter type systems.
(See figure 1a).
• For ease of servicing and burner removal
minimum clearances should be maintained.
(See figure 1b and 1c). In exceptional
circumstances the burner lid may be slid
diagonally for removal thus reducing the
vertical distance.
• Ensure that the suspension is sufficiently
flexible to allow for thermal expansion.
1.3.2 Suspending the heater - General
1.3.2.1 The first support is always positioned at
the support lug suspension point on the end
vent burner combustion chamber.
1.3.2.2 Subsequent supports are placed
approximately 2.8m apart, including one at each
combustion chamber location. This gives a max-
imum load per support of 24kg.
1.3.2.3 A support must always be located at a
maximum distance of 2m from a tee or elbow
fitting.
1.3.2.4 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.
1.3.2.5 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.
Table 1. Minimum mounting heights
Model
Minimum Mounting
Heights (m)
NRV12LR
3.0m
NRV18LR
3.6m
NRV24LR
4.0m
NRV32LR
4.7m
NRV38LR
5.3m
NRV46LR
6.0m
(100mm MIN - Perimeter Systems)
A - Burner Tube
B - LR Burner
C - Optional Perimeter Reflector
D - Wall
Figure 1.a Overall Dimensions