Burnham IN10 manual Check low water cutoff steam only, Do not drain below gauge glass, Check Limit

2.Adjust thermostat to highest setting.

3.Check main burner flames. See Figure 56 or 57. Flame should have clearly defined inner cones with no yellow tipping. Orange-yellow streaks caused by dust should not be confused with true yellow tipping.

4.Adjust thermostat to normal setting.

G.Check thermostat operation. Raise and lower temperature setting to start and stop boiler operation.

H.Check ignition system shutoff. Gas valve should close and pilot and main burners extinguish.

1.Continuous Ignition (Standing Pilot): disconnect thermocouple from gas valve.

2.Electronic Ignition (EI): disconnect igniter/sensor cable from ignition module terminal "9".

I.Check low water cutoff (steam only).

1.Adjust thermostat to highest setting.

2.With boiler operating, open drain and slowly drain boiler.

CAUTION

Do not drain below gauge glass.

3.Main burners will extinguish when water level drops 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.

J.Check Limit.

1.Adjust thermostat to highest setting.

2.Steam: Observe pressure gauge. When pressure is indicated, adjust limit to setting below observed pressure. Main burners should extinguish.

WARNING

Failure to properly adjust gas input rate will result in over firing or under firing of the appliance. Improper and unsafe boiler operation may result.

3.Water: Observe temperature gauge. When temperature exceeds limit set point main burners should extinguish.

4.Adjust limit to setting above observed reading. Main burners should reignite.

5.Adjust thermostat to lowest setting. Adjust limit to desired setting.

K.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.

a.Models IN3-IN12 with Standing Pilot, IN3-IN9 with Hot Surface to Pilot and IN3-IN11 with Electronic Ignition. 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.

b.Model IN12 with Electronic Only.

i. Turn off gas valve not having pilot control.

ii. On gas valve with pilot control, adjust gas valve pressure regulator to obtain required manifold pressure, or if unattainable, highest pressure without forcing adjustment screw (turn adjustment screw counterclockwise to decrease manifold pressure, or clockwise to increase manifold pressure).

iii. Turn on gas valve not having pilot control. Adjust gas valve pressure regulator to obtain required manifold pressure. Manifold pressure may not change during initial turns of adjustment screw.

3.Clock gas meter for at least 30 seconds. Use Table

10 to determine gas flow rate in Cubic Feet per

Hour.

4.Determine Input Rate. Multiply gas flow rate by gas heating value.

5.Compare measured input rate to input rate stated on Rating Label.

a.Boiler must not be overfired. Reduce input rate by decreasing manifold pressure. Do not reduce more than 0.3 inch w.c. If boiler is still overfired, contact your Governale distributor or Regional

Office for replacement Gas Orifice.

b.Increase input rate if less than 98% of Rating Label input. Increase manifold gas pressure no more than 0.3 inch w.c. If measured input rate is still less than 98% of rated input:

i. Remove Main Burners per procedure in Section X: Service Instructions.

ii. Remove gas orifices. Drill one (1) drill size

larger (drill size is stamped on orifice).

iii. Reinstall gas orifices and main burners.

Measure input rate.

6.Recheck Main Burner Flame.

7.Return other gas-fired appliances to previous conditions of use.

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