TECHNICAL ASSISTANCE SERVICE
43
ONLY FOR
g
NK MODELS
The storage cylinder should be serviced once a year to
check the condition of the internal parts and the magne-
sium anode, as well as for cleaning purposes.
Perform the following operations before beginning any
cleaning:
- Remove the top panel (1)
- Close the shut-off cocks for the domestic hot water cir-
cuit
- Connect a plastic hose to the hose union and empty
the storage cylinder through the storage cylinder drain
cock
- Pull the sensors out of their sockets
- Remove the screws (2) fixing the bracket (3) to the
casing
- Remove the screws (4) fixing the flange (5) in place,
and remove the flange
- Clean inside the domestic hot water cylinder and
remove any residues through the access hole
- Check the magnesium anode (6) for wear and replace
it if necessary
- Check the condition of the seal (7)
- Check the condition of the sensor holders (8).
Replace all removed components in the opposite order.
b
Push the domestic hot water temperature sensor
(1) into the shorter sensor holder and the TB sto-
rage cylinder thermostat (2) into the longer sensor
holder. Take care to push the sensors all the way
into their sockets. The socket for the TB thermostat
sensor has a raised lip above the surface of the
cap.
NOTE
Tighten the fixing nuts, proceeding diagonally around
the flange to apply pressure uniformly around the seal.
1
2
6
3
4
5
8
7
1
2
CLEANING THE STORAGE CYLINDER
