A.O. Smith BFC - 28 - Manual (Page 87)

Water-side maintenance
Release R.1.3 UK 87
s
12.3 Water-side mainte-
nance
12.3.1 Introduction
The following steps should be carried out on the water side:
1.
Checking the anodes .
2. Descaling and cleaning the tank .
3. Cleaning condensation water discharge .
12.3.2 Checking the anodes
Timely replacement of the anodes extends the service life of the appliance. The
appliance’s anodes must be replaced as soon as they are 60% or more used up
(take this into consideration when determining the maintenance frequency).
1. Loosen the anodes using suitable tools.
2. Check the anodes, and if necessary, replace them.
12.3.3 Descaling and cleaning the tank
Scale and lime buildup prevent effective conduction of the heat to the water.
Periodic descaling prevents buildup of these deposits. This increases the
service life of the appliance, and also improves the heating process. Take the
rate of scale formation into account when deciding on maintenance frequency.
1. Remove the cover plate 1 on the outer jacket. See Figure 12.6 .
2. Undo the bolts.
3. Remove the cover and the gasket.
4. Inspect the tank and remove any contamination.
5. Remove the scale using Borcoil
(1) .
6. Close the cleaning opening.
Use a new rubber gasket for this.
12.3.4 Cleaning condensation water discharge
It is essential to clean the condensation water discharge and siphon, to prevent
blockages.
12.4 Gas-side mainte-
nance
12.4.1 Introduction
The following steps should be carried out on the gas side:
1.
Cleaning the burner .
2. Cleaning the orifice .
3. Finalising maintenance .
12.4.2 Cleaning the burner
1. Detach the burner.
2. Remove all contamination present on the burner.
3. Fit the burner.
Figure 12.6 Cleaning opening
IMD-0080
1
1. A.O. Smith recommends the use of Borcoil, as the composition of this material is known to us.
Borcoil can be ordered from A.O. Smith.