Weil-McLain 80 Make final adjustments continued, Skim steam boilers, Freeze protection when used

• Installation • Start-Up • Maintenance • Parts

16 Make final adjustments (continued)

Figure 35 Flue damper assembly, typical

Skim steam boilers:

Determine if water treatment is needed (water boilers only):

Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to system components can result, causing substantial property damage.

Continual make-up water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating cast iron and causing section failure.

For unusually hard water areas or low pH conditions (less than 7.0) consult local water treatment company.

Freeze protection (when used):

1.Use antifreeze especially made for hydronic systems. Inhibited propylene glycol is recommended.

Do not use automotive, ethylene glycol or undiluted antifreeze. Severe personal injury or death can result.

2.50% solution provides protection to about -30°F.

3.Local codes may require back-flow preventer or actual disconnect from city water supply.

Clean all newly installed steam boilers to remove oil. Failure to properly clean can result in violent water level fluctuations, water passing into steam mains, or high maintenance costs on strainers, traps and vents. Skim boiler only. Do not clean old piping or leaks can occur.

Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to system components can result, causing substantial property damage.

1.Remove 1½" plug from skim tapping tapping “A” – Figure 28, page 29). Provide 1½" skim piping from tapping to floor drain (pipe to side of boiler).

2.Raise waterline to midpoint of skim piping.

3.Fire burner to maintain temperature below steaming rate during skimming process.

4.Feed in water to maintain water level. Cycle burner to prevent rise in steam pressure.

5.Continue skimming until discharge is clear. This may take several hours.

6.Drain boiler. While boiler is warm but not hot, flush all interior surfaces under full pressure until drain water runs clear.

7.Remove skim piping. Re-insert plug at boiler skim tapping.

8.Close drain cock. Fill with fresh water to normal water line. Start burner and steam for 15 minutes to remove dissolved gases. Stop burner.

9.Check traps and air vents for proper operation.

4.Determine quantity according to system water content. Boiler water content is listed on page 34. Percent of solution will affect sizing of heat distribution units, circulator and expansion tank.

5.Follow antifreeze manufacturer's instructions.

Check boiler for gas-tight seal:

Boiler must be sealed gas-tight to prevent possible flue gas leakage and carbon monoxide emissions, resulting in severe personal injury or death.

1. Remove boiler jacket side and top panels.

The boiler contains ceramic fiber and fiberglass materials. Use care when handling these materials per instructions on page 38 of this manual. Failure to comply could result in severe personal injury.

2.Start burner. Observe all sealing points and chalk mark any not gas-tight.

3.To seal all chalk-marked areas:

a.use silicone sealant on section flueways.

b.check gaskets and sealing rope placement.

4.Reinstall all jacket panels.

Part No. 550-141-935/0602 33