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Once installed, a higher or lower firing rate can be achieved by raising or lowering the manifold
pressure by +/- 0.3". Pressure changes can only be made when the burner is running. The typical
working manifold pressure for natural gas is 1.5 to 3.5 Inches of Water Column ("W.C.), or 1.0 to 3.0
"W.C. for propane. The maximum inlet pressure at the gas valve is 11 "W.C.; the minimum is 5 "W.C.
Refer to Chart 5 on page 9.
pressure drop when the system is running can reduce this greatly. Check the running pressure
to make sure there are no fluctuations in the pressure.
Clock the meter to determine the firing rate. The firing rate should be +/- 3% of the heat
exchanger manufacturers' specifications. Check the heat exchanger manual for further details.
The head is pre-set at the factory for OEM applications. Check your OEM manual for the proper
head setting for that oven. Using a combustion analyzer, check the CO
levels. Adjust the air as necessary (See below :)
Head
Adjustment
Turning the Air Adjustment dial clockwise opens the air shutter and increases the air; turning the air
adjustment dial counter-clockwise closes the air shutter and reduces the air.
Using a combustion analyzer, check the following readings:
If CO
is greater than 9.5% (O
2
If CO
is less than 8.8% (O
2
Carbon monoxide levels should be below 400 ppm; 100 ppm or less is ideal. Check local codes for
emissions requirements.
Note: if any adjustments are made, it is important to recheck the firing rate and combustion analysis.
LIGHTING INSTRUCTIONS
To light the SU-3/SU-4 Gas
Burner
1. Set the thermostat to the lowest
temperature
2. The control knob on the gas valve
should be in the "OFF" position for
at least five minutes.
3. Rotate the control knob counter-
clockwise to the "ON" position and
set the thermostat to the desired
temperature settings
Commissioning the Burner
NOTE: The static pressure of the system may be within norm, but the
Picture 6
Adjusting the Burner
<3.5%); Open Air Shutter
2
> 5%); Close Air Shutter
2
Reset, if Flame Lockout Occurs
1. Turn the thermostat off, or turn the main power off
2. Wait five minutes
3. Turn the main power on
1. Rotate the control knob on the gas valve to the "OFF"
position
2. Set the thermostat to the lowest temperature
(or O
) and carbon monoxide
2
2
To shut the burner off
12
Air
Adjustment
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