19
3. Main burners and pilot burner will extinguish when
water level falls below low water cutoff (water
should still be visible in gauge glass). Verify limit,
thermostat or other controls have not shut off boiler.
4. Adjust thermostat to lowest setting. Refill boiler to
normal water line.
M.
Check limit.
1. Adjust thermostat to highest setting.
2. Observe pressure gauge. When pressure is indicated,
adjust limit to setting below observed pressure.
Main burners should extinguish.
3. Adjust limit to setting above observed pressure.
Ignition sequence should begin.
4. Adjust thermostat to lowest setting. Adjust limit to
desired setting.
N.
Check Vent Damper Operation.
Vent Damper must be
in open position when main burners are ignited.
O.
Adjust gas input rate to boiler (Natural Gas).
1. Adjust thermostat to highest setting.
2. Check manifold gas pressure. Manifold pressure
is listed on rating label. Adjust gas valve pressure
regulator as necessary (turn adjustment screw
counterclockwise to decrease manifold pressure, or
clockwise to increase manifold pressure). If pressure
can not be attained, check gas valve inlet pressure.
If less than minimum gas supply pressure listed on
rating label, contact gas supplier for assistance.
3. Clock gas meter for at least 30 seconds. Use Table 9
to determine gas flow rate in Cubic Feet per Hour.
Figure 20: Main Burner Flame
Table 9: Gas Flow Rate in Cubic Feet per Hour
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