Dunkirk XEB II Series, Installation, Operation & Maintenance Manual

28

Burners

Beginning of heating season visually check pilot end main 

burner 

fl

 ames.  See Figures 14, 15 & 16 Pages 26 & 27.

Safety Relief Valve

Test safety relief valve for proper operation.  Refer to valve 

manufacturer’s instructions packaged with relief valve.

Expansion Tank (Non-diaphragm)

Tank may become waterlogged, or may receive excess 

of air. Frequent automatic opening of safety relief 

valve indicates water logging. High boiler temperature 

accompanied by unusually low radiation unit temperature 

(and “knocking”) indicates excess air in tank.
To correct:

1. 

Close valve between boiler and tank. Drain tank until 

empty. 

2. 

Check all tank plugs and 

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 ttings. Tighten as necessary. 

3. 

Open valve between boiler and tank. Water will rise to 

normal height in tank if you have automatic 

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 ll valve 

(otherwise, manually re

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 ll system).

Boiler Flue Passages

Recommend following checked annually by quali

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 ed service 

agent. 

• 

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 ue passages 

• burner adjustment
• operation of controls

Before start of each season (or whenever system has been 

shut down for some time) recheck whole system for leaks 

and recheck boiler and vent pipe for leaks. Replace or patch 

any boiler seals that are faulty. Before start of each season

(or whenever system has been shut down for some time) 

recheck the whole system for leaks . . . and recheck the 

boiler and vent pipe for leaks. Replace or patch any boiler 

seals that are faulty.

Vent Pipe

Venting and piping should be checked at least monthly. If 

vent piping shows any sign of leaking, replace immediately. 

Water System

If system is to remain out of service during freezing 

weather, always 

drain it 

completely (water left in to freeze 

will crack pipes and/or boiler).   

Cleaning Your Boiler And Burners

Flue passages between sections should be examined yearly 

and cleaned if necessary. 
To clean: 

• Remove burners, pilot, and vent pipe.
• Remove top and front jacket panels. 
• Remove two screws attaching intermediate front panel 

to left and right side jacket panels. 

• Remove control panel as a unit. 
• Remove draft diverter and intermediate front panel.
• Carefully remove cerafelt gasket strips. 
• Clean passageways between sections with 

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 exible 

handle wire brush. Remove dirt from bottom of boiler 

and from between sections by vacuuming. 

• Verify all 

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 ame ports in burners are open and clear. 

Shake out or blow out all loose dirt in burners. 

• Reseal seams between adjacent sections as necessary 

with 400

°

 F RTV silicone sealant. 

• Reassemble all parts. 
• Verify tightness of pilot connections and condition of 

burner 

fl

 ames after reassembly. See Figures 15 and 16. 

• Verify vent pipe connections to chimney are secure and 

no obstructions are present. 

Blower

Blower motor features permanently lubricated ball bearing 

construction. Lubrication is not required. 

Circulator Pump Isolation Valves

Operate isolation valves in circulator pump 

fl

 anges manu-

ally once or twice per year to prevent valves from becom-

ing stuck in open position 
Rotate valves from open position to closed position and 

back to open position.

Low Water Cutoff(s)

Inspect 

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 eld sourced low water cutoffs annually or 

as recommended by low water cutoff manufacturer.  

Flush 

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 oat type low water cutoff(s) per manufacturer’s 

instructions.

Housekeeping

• Keep boiler area clear and free from combustible 

materials, gasoline and other 

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 ammable vapors and 

liquids.

• Keep boiler area clear of debris and other materials 

obstructing 

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 ow of combustion and ventilation air.

MAINTAINING YOUR BOILER