LGB
LGB
LGB
LGB
LGB
Gas-Fired Boiler — Boiler Manual
Part Number 550-141-186/0703
24
Freeze protection
(when used)
1. Use antifreeze especially made for hydronic systems. Inhibited propylene glycol is
recommended.
2. 50% solution provides protection to about -30°F.
3. Local codes may require a back-flow preventer or actual disconnect from city water supply.
4. Determine quantity according to system water content. Boiler water content is listed on
back cover. Remember to add in expansion tank water content.
5. Follow antifreeze manufacturer's instructions.
Filling water boilers
1. Close manual air vents, drain cocks, and automatic air vent, if used.
2. Fill to correct system pressure. Correct pressure will vary with each application.
3. Open automatic air vent one turn, if used.
4. Starting on the lowest floor, open air vents one at a time until water squirts out. Close
vent.
5. Repeat with remaining vents.
6. Refill to correct pressure.
Water treatment
Continual fresh makeup 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 (below 7.0), consult local water treatment company.
7a
Final Adjustments — water boilers
Do not use petroleum-based cleaning or sealing compounds in boiler
system. Severe boiler damage will occur.
Do not use automotive, ethylene glycol or undiluted antifreeze. Severe
personal injury, death or substantial property damage can result.
