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240012994 Rev. B [08/31/2020]
11-1 ELECTRODES
11 - GENERAL MAINTENANCE AND CLEANING
DANGER
Before servicing, turn o electrical power to boiler at
service switch. Close manual gas valve to turn gas
supply OFF to boiler. Failure to comply will result in
death or serious injury.
!
11.4 Draining the Boiler
• turn boiler o
• isolate electrical supply
• close boiler gas service cock
• allow boiler to cool
• drain boiler through onboard drain if available or
external drain valve.
11.5 Draining the Heating Circuit
• Follow all steps in 11.4.
• Close central heating ow and return valves.
• Connect suitable pipe to drain point.
• Route it to suitable container.
• Open drain tap.
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