UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual page 66

!
D AN GER
Before servicing, turn off electrical power to
boiler at service swit ch. Close m anual gas valve
t o t urn gas supply OFF t o boiler. Failure t o
com ply will result in deat h or serious inj ury.
1 1 .4 Dra ining t he Boiler
• turn boiler off
• isolat e elect rical supply
• close boiler gas service cock
• allow boiler t o cool
• drain boiler t hrough onboard drain if available or
ext ernal drain valve.
1 1 .5 Dra ining t he H ea t ing Circuit
• Follow all st eps in 11.4.
• Close central heating flow and return valves.
• Connect suit able pipe t o drain point .
• Rout e it t o suit able cont ainer.
• Open drain t ap.
1 1 - 1 ELECTRODES
1 1 - GEN ERAL M AI N TEN AN CE AN D CLEAN I N G
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240013503 REV A, [ 03/ 15/ 2022]