68
11.6 Draining the Boiler
• Turn boiler off
• Isolate electrical supply
• Close boiler gas service cock
• Allow boiler to cool
• Drain boiler through onboard drain (item 19 page 7) or
external drain valve.
Draining the Heating Circuit
• Follow all steps in 11.6.
• Close central heating flow and return valves.
• Connect suitable pipe to drain point.
• Route it to suitable container.
• Open drain tap.
11 - GENERAL MAINTENANCE AND CLEANING
DANGER
Before servicing, turn off 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.
!
11-1 Electrodes
1
1/8"
+/-
1/16
(4 mm +/-0.5 mm)
A
B
C
1 3/8" +/- 1/8"
(10 mm +/- 1 mm)
P/N 240011664, Rev. E [09/15/2017]
