24
25
6. Direct Connection
Note: Fasten the screw nuts with caution, to avoid damage to the valves or the piping
system.
For direct connection, the two ½ inch screw-in nipples and the ½ inch seals must be
screwed into the ½ inch union nuts of the hot-water and cold-water connectors. The
two ½ inch caps of the side outlets of the hot-water and cold-water connectors must
be removed and screwed onto the open end of the screw-in nipples. The hot-water and
cold-water connectors must then be screwed into the
3
/
8
inch union nut of the appli-
ance inlet and outlet pipe, together with the
3
/
8
inch seals.
For direct connection, it may be advisable to mount the appliance at a distance as illus-
trated alongside, using the spacer sleeves supplied. The two fixing holes near the lower
pipe connections are also to be professionally fixed with 6 mm dowels and screws.
The flared end of the pipes must be screwed into the ½ inch side outlets of the hot-
water and cold-water connectors with ½ inch union nuts and ½ inch seals. The holes
required for the pipes must then be opened of the housing with the aid of a blunt
implement.
Note: In case of direct connection, put the strainer into the cold water connection!
Load Shedding Relay
If further three-phase appliances are connected, a load shedding relay designed for
electronic instantaneous water heaters (Art no. 82250) can be connected to phase
conductor L2.
To change the operating mode, after making the electrical connection and the initial
operation call up the settings menu. Then select the point “Load shedding”. If the menu
item is grayed out, first activate the “Expert Mode” under Settings/Software.
You can set a value of 0, 1 or 2 bay tapping or .
The locking function must be activated then (see chapter “8. Initial operation” sub
point “Locking function”).
Value Description
0
Operation without load shedding relay, factory setting
1
Operation with normal load shedding relay
2
Operation with sensitive load shedding relay
Operating mode 1 must be selected first, thus to check the correct operation of the
load shedding relay at low appliance output (35 degree celsius setpoint and low water
flow rate). Mode “2” must be selected if the load shedding relay flickers.
7. Electrical Connection
Wiring Diagram
1. Electronic circuitry
2. Heating element
3. Safety pressure cut-out
4. Connecting terminal
5. Safety thermal cut-out
1
2
5
3
4
Structural Prerequisites
• The appliance must be installed via a permanent connection. Heater must be
earthed!
• The electric wiring should not be injured. After mounting, the wiring must not be
direct accessible.
• An all-pole disconnecting device (e.g. via fuses) with a contact opening width of at
least 3 mm per pole should be provided at the installation end.
• To protect the appliance, a fuse element with trigger characteristic C must be fitted
with a tripping current commensurate with the nominal current of the appliance.
Note: Installation work must only be conducted by an
authorised professional.
Please observe:
• e.g. VDE 0100
• The installation must comply with current IEC and national local regulations or any
particular regulations, specified by the local electricity supply company
• The rating plate and technical specifications
• The appliance must be earthed!
