Nibe VPA 300/200 series Installateurhandbuch Seite 20

GB
Service
Safety valve (not supplied)
The water heater's safety valve sometimes releases a
little water after hot water usage. This is because the
cold water, which enters the water heater to replace
the hot water, expands when heated causing the
pressure to rise and the safety valve to open.
The function of the safety valves must be regularly
checked, about four times a year, to prevent clogging.
Sacrificial anode (only VPA 300/200-E E)
The water heater is equipped with a magnesium anode
that provides extra corrosion protection. Wear to the
anode is partly by sacrificing itself for pores in the
enamel and partly by sacrificial consumption due to
the chemical composition of the water.
Check the consumption of the anode within a year and
then regularly thereafter. When the anode is new it
has a diameter of 21 mm. When the diameter has re-
duced in its most used area to below 10 mm, the anode
is consumed and must be replaced. When replacing
anodes in confined spaces, there is a chain anode
available that only requires about 180 mm space above
the water heater.
If there is no anode consumption after a few years, this
could be due to poor conductivity in the water and
analysis of the water is recommended.
NOTE
The sacrificial anode is a consumable part! For
special water qualities, a direct current anode
is recommended.
20
Emptying
The water heater
The water heater is emptied through the siphon in the
cold water connection. To provide an air supply, a hot
water tap in the system can be opened and a pipe
coupling on the hot water side can be loosened.
Heating system
Empty the double-jacketed space through the siphon
in the docking connection, out to the outer heat source.
The air nipple can be opened to supply air if necessary.
Consideration must be taken of the entire heating
system before the double-jacketed space is emptied.
Accessories
Anode, DC
Part no. 034 208
Immersion heater IU31-IU311
Connection box K11
Part no. 018 893