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Part number 550-142-330/0421
11
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual
HOMEOWNERandSERVICETECHNICIAN—readandfollowcompletely.
Operation
SGO with float-type low water cutoff
1. If burner does not fire, check for:
•Switch on boiler or additional shut-off switches turned
off.
•Fuses or breaker switch tripped.
•Thermostat set below room temperature.
•Fuel valves turned off.
•Not enough oil in tank to supply burner.
•No water in gauge glass.
2. Correct problems found in Step #1. If burner does not fire,
press reset button on burner primary control only once.
Repeated presses will deposit oil in combustion chamber.
Burner must never be fired when oil is in combus-
tion chamber. Immediately call qualified service
technician.
3. If burner still does not fire, call qualified service technician.
Figure3 SGO boiler with float-type low water cutoff (see Figure 4, page 12 for probe-type low water cutoff)
Gauge glass
Steam relief valve
(on back of boiler)
Tankless heater
control
located
in tankless
heater plate
(sizes 3-5)
or in tapping in
back section
(sizes 6-9)
Float-type
Low water cutoff
Pressure
control
Pressure
gauge
Burner
primary
control
Service
switch
On boiler
Reset button
on burner
primary
control
Burner
disconnect
plug
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