Weil-McLain PER 550-141-396/0801 - Manual (Page 8)

Part number 550-141-396/0801 8
PER Series 3 Electric-Hydronic Boilers Installation Instructions
Operating instructions
Water treatment
Do not use petroleum-based cleaning or sealing compounds in boiler
system. Severe damage to boiler will result, causing substantial property
damage.
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.
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.
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 -30
° F.
Local codes may require a back-flow preventer or actual disconnect from city water supply.
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.