Preliminary Burner Adjustment; Pressure Working Chart - Riello G900 Installation, Use And Maintenance Instructions

PRELIMINARY BURNER ADJUSTMENTS
STANDBY WAITING FOR CALL FOR HEAT
DO NOT ADJUST THIS SETTING FOR ANY
REASON!!!
The ST0 lever is factory set at zero and corresponds to
the closed air damper position during standby.
DO NOT ADJUST THIS SETTING FOR ANY REASON!
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 when the first stage gas valve gets permission to open and must be set approximately 5° 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 when the 2
lower than ST2 (Example: if ST2 is set at 30º then N3 should be set 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 1.2 inches water column in the combustion zone, you will be
able to obtain a maximum of 600 KBtu/h burner output.
PRESSURE WORKING CHART
Natural and Propane Gas
1.5
1.0
0.5
0
200 300
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.
2903341
nd
stage (Hi fire) position of the air damper and must be set at a higher degree setting
nd
stage (Hi fire) gas valve gets permission to open and it must be set approximately 5°
400 500 600
Input - KBTU/h
D7342
700 800
12 GB
S8978
900 1000