PB Heat MI/MIH series manual Danger, Maintenance, E.Annually Before Start Of Heating Season

MAINTENANCE

E.ANNUALLY (BEFORE START OF HEATING SEASON)

DANGER

When servicing or replacing components, be absolutely certain that the following conditions are met:

●Water, gas and electricity are off.

●The boiler is at room temperature.

●There is no pressure in the boiler.

1.Check flueways and burners for cleanliness and clean if necessary. Use the following procedure if cleaning is required:

a.Refer to the Lighting/Operating Instructions in Figures 7.4 and 7.5 to properly turn off the gas to the boiler.

b.Turn off all electrical power to the boiler.

c.Remove burners and brush orifice spuds lightly using a soft bristle brush.

d.Remove the vent pipe, vent damper, top jacket panels and flue collector/draft diverter. Remove baffles on MIH models.

e.Brush flueways with wire brush.

f.To the extent possible, inspect inside of vent pipe and vent damper for obstructions in flow or vent damper movement. Remove or replace as necessary.

g.Re-install baffles on MIH models. When replacing the flue collector/draft hood, be certain that the blanket seal between the flue collector and top section makes a tight seal to prevent leakage of the products of combustion.

h.Re-install the top of the jacket, vent damper and vent pipe.

i.Re-install burners.

2.Inspect entire venting system for corrosion, support and joint integrity. Repair as necessary.

3.Check the pilot and main burner flame. See Figures

9.1and 9.2. The pilot should provide a steady flame enveloping 3/8″ to 1/2″ (1 cm to 1.2 cm) of the flame sensor. If required, adjust the pilot as stated in the gas valve manufacturer’s instructions or

paragraph 7.D. The main burner flame inner cone should be approximately 1-1/2″(4 cm) high and should have a very sharp, blue color characteristic.

Figure 9.1: Standing Pilot and Main Burner Flame

Figure 9.2: Intermittent Pilot and Main

Burner Flame

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