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Part Number 550-110-639/0703
16
EG, PEG, EGH GAS-FIRED BOILERS — SERIES 4 — BOILER MANUAL
Final adjustments
7
Filling water systems
1. Close manual air vents, drain cock, and automatic
air vent, if used.
2. Fill to correct system pressure. Correct pressure will
vary with each application. Residential systems are
often designed for 12 pounds of cold fill pressure.
3. Open automatic air vent one turn, if used.
4. Open manual water feed valve.
a) Starting on lowest floor, open air vents one at a time
until water squirts out. Close vent.
b) Repeat with remaining vents.
5. Close manual water feed valve when correct boiler
pressure is reached.
6. If purge valve is used - located in the return piping
above isolation valve:
a) Connect hose to purge valve.
b) Close isolation valve. Open purge valve.
c) Open hand water feed valve and allow system to purge
all air. If system has more than one circuit, purge each
circuit separately by opening each balancing valve one
at a time.
d) Close purge valve and water feed valve cock.
e) Open isolation valve.
f) Fill system to correct pressure.
Filling steam boilers
1. Do not fill (except for leakage tests) until boiler is
ready to be fired.
2. Fill to normal waterline, halfway up gauge glass.
3. Boiler water pH 7.0 to 8.5 is recommended.
4. Follow skimming procedure.
Water treatment
Do not use petroleum-based cleaning or
sealing compounds in boiler system. Severe
boiler damage will occur.
Continual fresh make-up water will reduce boiler life.
Minerals can build up in sections, reducing heat transfer,
overheating cast iron, and causing section failure.
In hard water areas or low pH conditions (less than 7.0)
consult local water treatment company.
Freeze protection (when used):
Use antifreeze especially made for hydronic systems.
Inhibited propylene glycol is recommended.
Do not use automotive, ethylene glycol or
undiluted antifreeze. Severe personal injury,
death or substantial property damage can
result.
50% solution provides protection to about -30°F.
Local codes may require back-flow preventer or actual
disconnect from city water supply.
Determine quantity according to system water content.
Boiler water content is listed on page 27. Remember to
add in expansion tank water content.
Follow antifreeze manufacturer’s instructions.