Detailed Service Procedures; Cleaning Boiler Flue Ways; General Description Of Control Operation - Weil-McLain WTGO 4 Series Manual

WTGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —

Detailed service procedures

Figure 25
Thoroughly clean flue ways between
all pins at all angles Start on top of
boiler, finish from the bottom

Cleaning boiler flue ways

Make sure all electrical connections to
boiler are turned off and wait until boiler
is warm, not hot, before cleaning. 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. Dis-
connect 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 flue ways and clean up
between the sections to reach pins left uncleaned
in Step #5.
7. Once the flue ways 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 combus-
32
SERVICE TECHNICIAN ONLY — read and follow completely.
tion 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 col-
lector hood on top of boiler. Secure with hardware from Step #2.
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, remove
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.
Water relief valve
Provides discharge if boiler pressure exceeds 30 psig.
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.
Circulator
Circulator provides forced water circulation through boiler and piping system.
Pressure-temperature gauge
Provides reading of boiler pressure and temperature. Maximum boiler
pressure is 50 psig, maximum water temperature 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.
Tankless water heater
Weil-McLain tankless heater ratings are based on 200°F boiler water tem-
perature. To get rated output, set tankless heater control to 200°F. Control
can be adjusted to meet system hot water requirements.
Expansion tank
As water heats up, it expands. Tank provides a place for increased water volume.
May be open, closed, or diaphragm-type. If relief valve opens frequently, expan-
sion tank may be water-logged. Drain tank and re-establish proper air cushion.
1. Open-type — Located above highest radiator or baseboard unit, usu-
ally in the attic or closet. Has a gauge glass and overflow pipe to drain.
2. Closed-type — Welded gas tight and located above boiler. Tank is par-
tially filled with water, leaving an air cushion for expansion.
3. Diaphragm-type — Welded gas tight with a rubber diaphragm to separate
air from water. Tank must be located near boiler before inlet to circulator.
An air vent must be installed in air vent tapping on boiler when this type
of tank is used. This eliminates air in system. Normal cold water fill pres-
sure is 12 psig. Tank pressure may be checked with an air pressure gauge.
Boiler Manual
Maintain a gas-tight seal to avoid possible flue gas leakage
and carbon monoxide emissions, which can lead to severe
personal injury or death.
Part number 550-142-332/0421