PER Series 3
Operating instructions
Water treatment
Do not use
Eliminate all leaks. Continual fresh makeup water will reduce boiler life. Minerals can build up in section, 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. Boiler water pH of 7.0 to 8.5 is recommended.
Freeze protection (when used)
See WARNING on page 2 for important information regarding glycol hazard.
Do not use automotive, ethylene glycol or undiluted antifreeze. Severe personal injury, death or substantial property damage can result.
Use antifreeze especially made for hydronic systems. Inhibited propylene glycol is recommended.
50% solution provides protection to about
Local codes may require a
Determine quantity according to system water content. Boiler water content is listed in the Ratings table on page 13. Remember to add in expansion tank water content.
Filling the system with water
Never apply power to the boiler unless the boiler is filled with water.
1.Close manual air vents, drain cocks, and automatic air vent, if used.
2.Fill the boiler and system to an initial pressure of about 12 pounds per square inch.
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.
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