Main Burner System; Main Burner Conditions - Pitco 20 Installation And Operation Manual

1.5.3 Main Burner System

For the burners to work the gas supply valve must be open and the main power switch must be on.
The main burner receives gas from the main gas supply through the thermostatically controlled valve.
When the thermostat is turned up the gas control valve opens. If you have a pilot light system, the
pilot will ignite the burners. The electronic ignition system will create a spark to ignite the gas. After
the burner system is operating, perform the burner adjustments in the following procedure. Figure
1-2 illustrates the different conditions possible for the main burner.
The tubes and baffles are
badly carbonized. Check
vent and adjust if necessary.
Check for heat tube or flue
blockage.
INSUFFICIENT FLOW
Have gas company check
incoming gas pressure.
Adjust manifold pressure as
described in 1.5.3.2.
INSUFFICIENT GAS PRESSURE
Figure 1-2 Main Burner Conditions
1-12
The flame seems to "lift off"
the face of the burner.
To correct adjust main
burner as described in
1.5.3.2.
EXCESSIVE FLOW
A soft, steady blue flame
should enter the heat tube
without touching the front
outside rim of the tube.
NORMAL FLOW