64
LP-542 REV. 6.2.16
3. APS / BURNER OVERHEAT LIMIT / CONDENSATE BLOCK SWITCH
Figure 54 – APS / Burner Overheat Limit / Condensate Block Switch Error Analysis Tree
4. STORAGE / OP / CH OVERHEAT / EXHAUST OVERHEAT SENSORS
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.
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