DORCHESTER DR-FC 25, Installation, Commissioning And Maintenance Instructions

Page: 93 / 98

Water-side maintenance
Instruction Manual DR-FC 93
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 heater .
3. Cleaning condensate discharge .
12.3.2 Checking the anodes
Timely replacement of the anodes extends the service life of the water heater.
The water heater’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 heater
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 water heater, 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 heater and remove any contamination.
5. Remove the scale using a suitable chemical cleaner.
6. Close the cleaning opening.
Use a new rubber gasket for this.
12.3.4 Cleaning condensate discharge
It is essential to clean the condensate 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.
12.4.3 Cleaning the orifice
1. Detach the orifice.
2. Remove all contamination present in the orifice.
Figure 12.6 Cleaning opening
IMD-0080
1