Model G3B Gas burner — Instruction manual
MNG3B Gas 041015
14
5. Perform Checkout Procedures • Fill Out Certificate
Make final burner adjustments
Check for leaks in gas piping
❏
Smell around burner to make sure there is no gas leak in near-burner
piping. Verify integrity of gas line joints between combination gas
valve and burner gas inlet tapping using soap suds mixture. Verify
gas piping is fully supported, independently of burner.
Check for leaks from burner components
❏
Smell around burner to make sure there is no leakage from the burner
inlet air tube, blower housing or air tube. Verify burner is properly
supported and flange is securely tightened.
If you detect leakage from any burner component, immediately
close the main manual gas valve. Use a soap suds mixture to
determine leakage location. Replace burner if leakage cannot
be corrected by properly securing components. You may have
to restart the burner several times during leakage testing
since the control will lockout when flame is not detected.
Failure to correct leakage problems could result in severe
personal injury, death or substantial property damage.
Check/adjust gas valve outlet pressure
❏
With burner running, check manometer reading for combination gas
valve outlet pressure. Adjust valve regulator if necessary so the
reading is 3.5 inches w.c. for either natural gas or propane gas.
Inspect flame
❏
Look at flame through appliance observation port. The flame should
be a soft blue with well-defined orange and yellow tips for natural
gas, or well-defined yellow tips for propane gas. (If you make air or
gas pressure changes later, inspect the flame again.)
Check the firing rate
❏
Natural gas only — Turn off all other gas appliances connected to
the gas meter. Use a stopwatch to time the number of seconds for a
flow of one cubic foot of gas (two revolutions for a one half cubic foot
per revolution dial, for example). You will also need to know the gas
heat content in Btu per cubic foot. Determine the actual input from:
INPUT = (3600 x Btu per cubic foot) ÷ (number of seconds for one cubic
foot), for firing rate in Btuh. For example, for 1050 Btu per cubic foot
natural gas, with meter timed at 30.2 seconds for one cubic foot of
gas: INPUT example = (3600 x 1050) ÷ (30.2) = 125,200 Btuh. Firing
rate should be within ± 5% of rated input for the appliance. Adjust
the combination gas valve pressure regulator if necessary to obtain
the correct firing rate. Valve outlet pressure must not be lower than
3.2 inches w.c. nor higher than 3.8 inches w.c.
❏
For propane gas, contact your propane supply for procedure to verify
firing rate.
Make final burner adjustments
(continued)