User Manual - Nibe Eminent Series User's And Installer's Manual

User manual

Maintenance
Safety valve
The safety valve (FL1) must be inspected regularly,
about 4 times a year, to prevent clogging. The check is
made by turning the safety valve's knob anticlockwise,
water should then flow through the overflow pipe. If
this does not happen, then the safety valve is defective
and must be replaced.
The safety valve sometimes releases a little water after
hot water has been used. This discharge is caused by
the expansion of cold water entering the water heater,
resulting in a pressure increase, whereby the safety
valve opens.
Sacrificial anode (only EMINENT-E)
The water heater is equipped with a magnesium anode
(FR2) that provides extra corrosion protection. The an-
ode is consumed partly because it sacrifices itself for
pores in the enamel and partly because it consumes
itself, depending on the chemical composition of the
water.
Check the anode within a year. Then check regularly,
in relation to its use. When the anode is new, it has a
diameter of approx. 21 mm. When this diameter has
reduced, in the most consumed area, to less than 10
mm, the anode is consumed and must be replaced.
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 anode is a consumable.
Replacing/checking the sacrificial anode
If there is a hot water tap in the pipe system situated
below the water heater's highest point, the anode can
be replaced/checked, without the water heater need-
ing to be emptied. If there is not a hot water tap or the
water heater is installed horizontally it must be drained,
see section "Draining".
Turn off the power to the water heater.
■
Open the shut off valve/non-return valve by turning
■
the knob (QM35) clockwise until it bottoms.
Open the hot water tap mentioned above.
■
Remove the plastic cover (QQ4) and the insulation
■
plug, see image.
The sacrificial anode (FR2) is unscrewed using a 27
■
mm, or 24 mm, socket wrench.
When replacing anodes in confined spaces, a chain
anode is available that only requires approx. 180 mm
space above the water heater. The chain anode can
only be used in vertically mounted water heaters and
must be cut to length according to the table, see
"Technical data".
Eminent
GB
19