18
4 Installation
4
.1 Preparation prior to installation
Check burner’s rating plate and capacity graph
u Check the burner type and rating.
u The burner rating must be within the operating range of the heating appliance. The
ratings given on the burner plate are the minimum and maximum possible firing rates
of the burner. See the capacity graph in chapter 3.4.4.
Check the installation space
u Ensure sufficient space for the burner installation and maintenance.
u Ensure sufficient fresh air supply to the burner - if required, install air ducting.
Preparing the heating appliance
The refractory 3 must not protrude beyond the front edge of the combustion head. The
refractory can take a conical shape (min 60°). Refractory may not be required on boilers
with water-cooled fronts, unless the manufacturer gives other instructions.
The gap 4 between the flame tube and the refractory must be filled with resilient
insulation material (do not make solid).
Heat exchangers with deep refractories or thick doors, or heat exchangers with reverse
flame combustion chambers may require a combustion head extension. Head extensions
of 3-7/8” (100 mm), 7-7/8” (200 mm) and 11-3/4” (300 mm) are available. The
dimension 2 changes accordingly with the used head extension.
45°
6-3/4”
(170 mm)
M8
5-1/8”
(130 mm)
60°
5-3/8”
(135 mm)
4-3/4”
(120 mm)
2
1
4
3
1 Boiler plate
2 5-1/2” (140 mm)
3 Refractory
4 Gap
Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
83055116 • 1/2016-05
18
83055116 • 1/2016-05
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