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2.5.2 Descaling
Calcium precipitation depends on the water properties and the hot water demand. In
addition, calcium precipitation in the tanks increases at high water temperatures. A clean
out opening is located at the front for inspecting and descaling the tank. The clean out
opening can be reached via the cover plate on the outer jacket of the tank. Empty the tank
before opening the clean out opening. Descaling must be carried out with suitable
descaling agents, which can be ordered form A.O. Smith distributors.
To ensure that the clean out cover is watertight, the flange gasket should be replaced after
every inspection.
2.6 Spare parts
It is important to mention the tank type, model and full serial number when
ordering spare parts. The spare parts can be determined on the basis of these
numbers.
3. FOR THE END USER.
Warning
An accredited installer must install the tank and perform start up of the system.
3.1 Filling the tank
1. Check if drain valve is closed (if mounted).
2. Open the cold-water tap to the heater and all hot-water outlets in order to bleed all air
from the system. The heater is filled when cold water runs out of all outlets.
3. Close all taps at the hot-water outlet points. The tank is now under (water mains)
pressure. At this pressure the pressure relief valve must not release any water.
3.2 Start up of the system.
1. Check if the heater is filled with water and that the primary system is ready.
2. Set the controls on the primary circuit t of the boiler to the required sanitary water
temperature.
3. Open boiler supply and return valves (if installed)
3.3 Shutting down
For longer periods
1. Close the cold-water tap.
2. If there is any risk of frost damage, drain the tank completely.
3.4 Maintenance
The pressure relieve valve must be tested regularly by opening test lever for some
seconds. The water must run out in a full jet. Close lever again, making sure it sets
properly and the valve is not leaking. Check if the drainpipe is open. It is recommended
to arrange for a maintenance contract with the installer.
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