Aps / Burner Overheat Limit / Condensate Block Switch; Storage / Op / Ch Overheat / Exhaust Overheat Sensors; Part 11 - Start-Up Preparation - Westinghouse WBRU 80W Series Installation, Start-Up And Maintenance Instructions

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3. APS / BURNER OVERHEAT LIMIT / CONDENSATE BLOCK SWITCH

Figure 54 – APS / Burner Overheat Limit / Condensate Block Switch Error Analysis Tree

Figure 55 – DHW / OP / CH Overheat / Exhaust Overheat Sensors Error Analysis Tree

PART 11 – START-UP PREPARATION

Thoroughly clean and flush any system that has used glycol before installing the boiler.

Do not use petroleum-based cleaning or sealing compounds in the boiler system. Damage to elastomer seals and gaskets in the

system could occur, resulting in substantial property damage.

Clean system to remove sediment*

1. You must thoroughly flush the system (without the boiler connected) to remove sediment. The high-efficiency heat exchanger can be

damaged by buildup or corrosion due to sediment.

2. For zoned systems, flush each zone separately through a purge valve. (If purge valves and isolation valves are not already installed,

install them to properly clean the system.)

3. Check return Y strainer. Remove and clean sediment and debris if necessary.

4. Flush system until water runs clean and you are sure piping is free of sediment.

*NOTE: It is recommended you clean heat exchanger at least once a year to prevent lime scale buildup. Follow the maintenance

procedure to clean the heat exchanger in this manual.

NOTE: BOILER FAILURE DUE TO IMPROPER WATER CHEMISTRY IS NOT COVERED BY WARRANTY.

WHL-032 REV. 6.2.16

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