Maintenance - Nibe EMINENT E/CU/R 35 Installation And Maintenance Instructions Manual

GB

Maintenance

Maintenance
Safety valve
The safety valve (23) 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
(40) that provides extra corrosion protection. The anode
is used partly because it sacrifices itself for pores in the
enamel, partly because it uses itself depending on the
chemical composition of the water.
Check the anode within a year. Then 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 10mm the anode is
consumed and must be replaced.
If the anode has not been consumed after a few years,
it may be due to poor conductivity in the water and a
water analysis is recommended.
NOTE!
The anode is a consumable.
Replacing/checking the sacrificial anode
The anode can be replaced/checked, without the water
heater needing to be emptied, if there is a hot water
tap in the pipe system situated below the water heater's
highest point. If there is not a hot water tap or the wa-
ter heater is installed horizontally it must be drained, see
section "Draining".
1 Turn off the power to the water heater.
2 Open the shut off valve/ non-return valve by
turning the knob (22) clockwise until it bot-
toms.
3 Open the hot water tap mentioned above.
4 Remove the plastic cover (3) and the insulation
plug, see image.
5 The sacrificial anode (40) is unscrewed using
the 27 mm, or 24 mm, socket.
When replacing the anode in tight spaces, a chain an-
ode 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 according to the table, see "Technical data".
16
Emptying
Draining is through the safety valve overflow pipe and is
carried out as follows:
1 Turn off the power to the water heater.
2 Open the shut off valve/ non-return valve by
turning the knob (22) clockwise until it bot-
toms.
3 Turn the mixer valve (25) fully anticlockwise.
4 Open the safety valve by turning the knob (23)
slowly anticlockwise a quarter of a turn until it
is fixed in the raised position.
NOTE!
Water splashes may occur at the overflow pipe.
5 Remove the vent screw (45) and open the hot
water tap positioned lowest in the pipe system.
NOTE!
Hot water may squirt out of the air screw hole.
It can take a few minutes for draining to start.
To speed draining, air can be introduced via the vent
screw (45).
Keep the valves' positions after the above actions until
the water heater is to be used again.
A small amount of water may remain at the bottom of
the water heater after performing draining stages 1
NOTE!
The overflow pipe must be connected to
25
42
41
EMINENT
pos (43).
45
43
5.
–
22
23