Weil-McLain 550-141-826/1201 - Manual (Page 30)

SERVICE TECHNICIAN ONLY — read and follow completely.
Detailed service procedures
Cleaning boiler flueways
Make sure all electrical connections to boiler are turned
off and wait until boiler is warm, not hot, before clean-
ing. Failure to do so will result in severe personal injury,
death or substantial property damage.
1. Top flue boilers -remove breeching and jacket top panel.
Rear flue boilers - remove jacket top panel.
2. Remove flue collector hood, saving hardware for reassembly.
3. Shut off oil valves. Arrange drip pans under the areas of oil piping
that will be disconnected. Disconnect oil line at burner so that you
can swing open the door completely.
4. Line combustion chamber floor with newspaper to catch any soot
that will be loosened in the cleaning process.
5. Starting at the top of the boiler, use a wire flue brush to thoroughly
clean between all pins at all angles. Be careful not to damage side
walls of rear refractory.
6. Move to the bottom of the flueways and clean up between the
sections to reach pins left uncleaned in step #5.
7. Once the flueways are cleaned, carefully remove the paper from
the floor of the combustion chamber.
8. Verify sealing rope around flue area is intact. Visually check condition and
position of insulation in combustion chamber floor, and the refractories
at the rear of boiler and in the burner mounting door. Replace any parts
as necessary.
9. Close burner mounting door and tighten nut securely. Place flue
collector hood on top of boiler. Secure with hardware from step #2.
Maintain a gas-tight seal to avoid possible flue gas leak-
age and carbon monoxide emissions, which can lead to
severe personal injury or death.
10. Check breeching for sooting and clean if necessary. Install jacket
top panel and breeching.
11. Reconnect oil line and all electrical connections.
General description of control operation
Automatic air vent
Air is released when cap is unscrewed one turn. If air vent leaks, re-
move small cap on top of vent, push in stem of valve and then release
to clean valve seat. Screw cap completely on, then unscrew one turn.
Temperature limit control
If high boiler water temperature occurs, control shuts down burner, but
allows circulator to run as long as there is a call for heat. Limit should
be set higher than temperature needed for the system.
Maximum limit setting is 220°F.
Figure 21 Thoroughly clean flueways between all pins
at all angles. Start on top of boiler, finish from
the bottom.
Water relief valve
Provides discharge if boiler pressure exceeds 30 psig.
Circulator
Circulator provides forced water circulation through boiler
and piping system.
Pressure-temperature gauge
Provides reading of boiler pressure and temperature. Maxi-
mum boiler pressure is 50 psig, maximum water tempera-
ture is 220°F. Temperature will vary according to system
and daily heating demands. The range will be from room
temperature up to limit control setting.
Part number 550-141-826/1211 30
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Boiler Manual