Weil-McLain SGO Series, Maintenance And Service Manual

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11
Detailed Service Procedures
Controls requiring annual service:
FLOAT -TYPE LOW WATER CUTOFF:
Follow instructions to blowdown cutoff on page 4.
Also refer to instructions from cutoff manufac-
turer in envelope assembly provided with boiler.
PROBE -TYPE LOW WATER CUTOFF:
Cutoff must be removed and inspected and
cleaned annually. Refer to cutoff manufacturer's
instructions in envelope assembly provided with
boiler.
STEAM RELIEF VALVE:
Check operation of steam relief valve. Follow
instructions on label fastened to relief valve.
Scald potential. Do not check
operation of relief valve unless discharge piping
has been installed according to Boiler Manual.
If piping is not in place, a qualified service
technician must properly install piping.
GAUGE GLASS:
To clean glass:
1. Close lower gauge glass cock and carefully
open petcock below glass to blow water and
sediment out of glass by steam pressure.
2. Slowly open lower gauge glass cock and allow
a small amount of water to flush out through
the open petcock.
3. Close petcock and fully open lower gauge cock.
The water level should immediately rise to its
proper level.
4. If gauge glass breaks, close off both gauge
cocks and loosen glass retaining nuts to
remove gauge glass. Do not use thin glass
tubing as a replacement.
General description of control operation:
LOW WATER CUTOFF:
Shuts down boiler if there is a low water condi-
tion.
STEAM RELIEF VALVE:
Provides discharge if boiler pressure exceeds 15
psig.
PRESSURE LIMIT CONTROL:
If high steam pressure occurs, control shuts
down burners until pressure drops. Limit should
be set higher than design pressure of system. Op-
erating control can be set at 5 psig and
adjusted to comfort level. Normal operation is
usually less than 5 psig. At certain times the
system may operate under vacuum conditions.
GAUGE GLASS:
Indicates boiler water level. Cold fill water level
should correspond to line stamped on boiler
jacket. When boiler operates, water level will fluc-
tuate.
PRESSURE GAUGE:
Provides reading of boiler pressure. Maximum
boiler pressure is 15 psig.
TANKLESS WATER HEATER:
Weil-McLain tankless heater ratings are based on
200
0 F boiler water temperature. To get rated out-
put, set tankless heater control to 200 0 F. Control
can be adjusted to meet system hot water require-
ments.
Part No. 550-141-830/1202