A.O. Smith DRE PLUS, Installation, User And Service Manual

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10 Maintenance
The water heater needs maintenance at least once a year. The maintenance interval is
determined by the water quality, the average operation hours each day and the set water
temperature.
To determine the correct interval, A.O. Smith recommends to do a system check three
months after installation.
Note
Do maintenance to maintain an effective and efficient transfer of heat to the water. This
significantly increases the service life of the water heater.
Note
When needed, spare parts can be ordered. To be sure that you receive the correct spare
parts, look at the data plate for the full serial number and the water heater model. Use
this information when you order the spare parts.
Do the following maintenance activities:
•
Preparation (see 10.1)
• Water-side maintenance (see 10.2)
• Performance check (see 10.3)
• Finalization (see 10.4)
10.1 Preparation
Isolate the water heater from the mains before you start maintenance tasks.
10.2 Water-side maintenance
To do water side maintenance:
•
Inspect the anode (see 10.2.1)
• Descale the tank
10.2.1 Inspect the anode
The life cycle of the anode is determined by the quality and the quantity of the water that
flows through the water heater. Inspect the anode at least once a year to make sure that
the tank is protected against corrosion.
To inspect the anode:
1.
Close the stop valve in the cold water supply.
2. Open the nearest hot water tap to reduce the water pressure in the water heater.
3. Use a wrench to loosen the anode.
4. Take the anode out of the water heater.
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