Preliminary Burner Adjustment; Pressure Working Chart - Riello Two stage operation forced draught natural gas/propane burner Installation & Operating Manual

PRELIMINARY BURNER ADJUSTMENTS
STANDBY WAITING FOR CALL FOR HEAT
DO NOT ADJUST THIS SETTING FOR ANY
REASON!!!
The ST0 lever is set at the factory and corresponds
to the air gate shut position of zero on the.
st
1 STAGE (LOW FIRE) AIR DAMPER SETTING
The ST1 lever controls the first stage position of the air damper and must be set at a higher degree setting than
the ST0 Lever.
Lever N5 controls the opening of the first stage gas Valve and it must be set approximately 5º lower than ST1.
(Example: if ST1 is set at 20º then N5 should be set at approximately 15º).
nd
2 STAGE (HI FIRE) AIR DAMPER SETTING
The ST2 lever controls the 2
than the ST1 Lever.
Lever N3 controls the opening of the 2
ST2. (Example: if ST2 is set at 30º then N3 should beset at approximately 25º).

PRESSURE WORKING CHART

The chart below shows effects of pressure in the combustion zone on the minimum/maximum burner outputs.
In this example, with a maximum operating pressure of 1.0 inches water column in the combustion zone, you will
be able to obtain a maximum of 615 KBtu/h burner output.
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
40 60 100
205 311
Any change from zero (0) pressure in the combustion zone will affect the KBtu output of the burner. To supply the
required input to the appliance, manifold pressure will have to be adjusted to compensate for this condition.
3245
nd
stage (Hi fire) position of the air damper and must be set at a higher degree setting
nd
stage (Hi fire) gas valve and it must be set approximately 5º lower than
140 180 220
472 615 751
D7342
PRESSURE WORKING CHART
Natural and Propane Gas
kW/h
260
KBtu/h
888
GB
11