User Manual

11
Furnaces (continued): Atmospheric, Gas & Oil
Atmospheric Furnace
Draft
Verify proper
• Temperature Rise
• AC side Static Pressure
Drop across coils
Verify proper combustion:
• O2
• CO
• Stack Temp
• Efficiency
WHERE TO TEST (CONT.)
Natural Gas & Propane
Verify proper combustion:
• O2
• CO
• Stack Temp
• Vent Pressure
• Efficiency
Test
• Limit Switch
• Pressure Switch
Set Up
• Gas Pressure
Verify proper:
• Static Duct Pressure
• Temperature Rise
• AC side Static Pressure
Drop across coils
Oil Furnace
Verify proper combustion:
• O2
• CO
• Stack Temp
• Stack Draft
• Efficiency
Test & Verify:
• Smoke
Set Up
• Over Fire Draft
Verify proper
• Static Duct Pressure
• Temperature Rise
• AC side Static Pressure
Drop across coils
WHAT RESULTS ARE GENERALLY ACCEPTABLE
Atmospheric Gas Fired Burners
• Oxygen ................................ 7 to 9% O2
• Stack Temperature ..................... 325 to 500°F
• Draft (Water Column Inches) ............ -.02 to -.04wc”
• Carbon Monoxide (parts per million) ........... <100ppm
Gas Fired Power Burners
• Oxygen ................................ 3 to 6% O2
• Stack Temperature ..................... 275 to 500°F
• Stack Draft (Water Column Inches) ....... -.02 to -.04wc”
• Overfire Draft (Water Column Inches) ........... -.02wc”
• Carbon Monoxide (parts per million) ........... <100ppm
Oil Fired Burners (#2 Oil Fuel)
• Oxygen ................................ 4 to 7% O2
• Stack Temperature ..................... 325 to 600°F
• Stack Draft (Water Column Inches) ....... -.04 to -.06wc”
• Overfire Draft (Water Column Inches) ........... -.02wc”
• Carbon Monoxide (parts per million) ........... <100ppm
• Smoke .......... 0 (or manufacturer’s recommendation)
Positive Overfire Gas & Oil
• Oxygen ................................ 3 to 9% O2
• Stack Draft (Water Column Inches) ....... -.02 to -.04wc”
• Overfire Draft (Water Column Inches) .... +0.4 to +0.6wc”
• Carbon Monoxide (parts per million) ........... <100ppm
NOTE: Follow manufacture guidelines for the specific equipment being
serviced.
Typical Excess Air Level
O2% (measured) Excess Air %
Natural gas 3% 16.7%
Light Oil 5% 31%
Coal 8% 62%