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Part number 550-142-330/0421
39
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual
SERVICETECHNICIANONLY—readandfollowcompletely.
❏ Service. . . . . . . . . .
Gaugeglass
Normal waterline is halfway up gauge glass. Clean when needed.
1. Close lower gauge cock.
2. Open pet cock.
3. Open lower gauge cock and allow a small amount of water to
flush out through open pet cock.
4. Close pet cock.
5. Open lower gauge cock.
Boiler pressure must be low to eliminate potential
of severe burns.
If gauge glass breaks, close both gauge cocks. Replace
gauge glass. Do not replace with thin glass tubing.
Failure to comply could cause severe personal injury,
death or substantial property damage.
❏ Check/test. . . . . . . . . .
Boilerwaterline
Normal waterline is halfway up gauge glass.
Limitcontrols
Inspect and test the boiler limit control. Verify operation by turn-
ing control set point below boiler pressure. Boiler should cycle off.
Return dial to original setting.
Lowwatercutoffs
Probe-type low water cutoff (see below)
Clean and test probe-type low water cutoff for proper operation.
Remove, inspect and clean the low water cutoff at least annually
before testing. Refer to low water cutoff manufacturer’s instruc-
tions in envelope assembly provided with boiler.
1. Turn off power to boiler and wait 5 minutes.
2. Drain water to bottom of gauge glass.
3. Turn on power.
4. Set thermostat to call for heat. Red neon lamp on lower water
cutoff should light.
5. Wait 5 minutes. Boiler should not fire.
6. Refill boiler to correct waterline. Red lamp should go off.
7. Wait 5 minutes. Boiler should fire.
8. Return thermostat to normal setting.
❏ Check/test. . . . . . . . . .
Float-type low water cutoff (when provided by others
— see below)
Clean and test float-type low water cutoff (when provided by
others) to clear float chamber of sediment.
1. Open blow down valve at bottom control.
2. Drain water into a bucket.
Scald potential. Boiler pressure must be low to avoid
the potential of severe burns from steam.
3. Check float-type low water cutoff for proper operation:
a. Turn operating control to call for heat.
b. Before water gets hot, drain to bottom of gauge glass.
Boiler should shut off after water level lowers a few inches.
c. Refill boiler to correct waterline. Boiler should come back on.
❏ Check monthly
Venting system
Visually inspect all parts or the flue gas venting system for
any signs of blockage, leakage or joints or deterioration of the
piping. Notify your qualified service technician at once if you
find any problem.
Failure to inspect the vent system as noted above and
have it repaired by a qualified service technician can
result in vent system failure, causing severe personal
injury or death.
Service and maintenance (continued)
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