Detailed Service Procedures
Controls requiring annual service:
Follow instructions to blowdown cutoff on page 4. Also refer to instructions from cutoff manufac- turer 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:
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