User manual A.O. Smith ST 3000

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2.3 Commissioning  
.3.1 Filling the tank  
. Check if any installed drain valve is closed.  
. Open the cold-water supply valve to the heater  
. Open 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.  
. Close all hot water taps  
.3.2 Start up  
Check if the heater is filled with water and that the primary system is ready. Open water  
supply and return valves.  
.4 Shutting down  
For longer periods:  
. Close the cold-water tap.  
. If there is any risk of frost damage, drain the tank completely.  
.5 Maintenance  
The heater must be checked and cleaned regularly (at least once a year) by an accredited  
installer, so that correct operation is guaranteed.  
.5.1 Anodes  
The life of the anode is determined by the quality and quantity of the water flowing  
through the heater. Therefore, we recommend the anodes to be checked regularly –  
preferably simultaneously with an internal inspection of the glass-lined tank. In order to  
determine the frequency of replacement of the anode, the waterside of the boiler must be  
checked three months after installation. The anodes must be replaced, if more than 60%  
has dissolved at any point on their length.  
. Close the cold-water inlet tap.  
. Relieve pressure from the heater completely by opening a hot water tap.  
. Remove the insulation package.  
. Unscrew and inspect the anode. Replace when used for more than 60 %.  
. Replace the anode. Attention: the anode must be in contact with the metal tank. If  
the tank and the anode are electrically isolated, the anode cannot function. This  
could have a negative effect on the life of the tank.  
. Assemble everything in reverse order.  
. Fill the heater as described in par. 2.2.1.  

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