Beckett RWF40 CG15 Manuel D’Utilisation

The optional modulation linkage assembly has been 
designed as an economic means to adjust the damper 
and the butterfl y valve to maintain air to gas ratios. When 
the optional Modulation linkage assembly is supplied 
with the burner, initial adjustments will be made at the 
factory. To ensure optimum operation, minor additional 
adjustments must be made after the burner is fi red on a 
boiler.
 
The following adjustment will be pre-set at the factory, 
but may require minor adjustment at start-up:

The damper motor high fi re and low fi re cams will be 
preset.
The linkage between the damper and the butterfl y 
valve will be preset as illustrated in the manual.
The butterfl y valve shaft will be set to a nominal 
position.

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Referring to the appliance 
manufacturer’s literature, insure that 

all preliminary adjustments and calibrations required for 
the burner and appliance have been performed.

A) Prior to starting the burner

Verify that the damper motor high fi re and low fi re cam 
settings match the nameplate (Figure 1) or Table 3.
Examine the linkage for signs of damage.
Referring to the illustrations in Figures 11 or 12, 
verify that the linkage is installed as shown.
Prior to adjusting the burner, have available all the 
necessary test equipment.

A manometer to check pressures downstream 
of the gas pressure regulator; at the manifold 
pressure test connection and in the furnace 
A draft gauge to check breaching pressure 
A fl ue gas analyzer that can measure O2 (or 

CO2) and CO.

Adjust the gas pressure regulator to about ½” WC 
higher than the anticipated high fi re gas pressure 
(see Table 3).
To prevent the burner from modulating to high fi re, 
set the modulation controller to the manual control 
mode.  If necessary, refer to the manual supplied 
with the modulation controller. 

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