28 | DEL SL electronic LCD www.stiebel-eltron.com
INSTALLATION
Preparations
Load shedding relay (LR 1-A)
The load shedding relay for installation in the distribution board
provides priority control for the instantaneous water heater when
other appliances, such as electric storage heaters, are simultane-
ously being operated.
ZTA 3/4 - central thermostatic valve
The thermostatic valve is for central premixing, for example on an
instantaneous water heater with solar thermal system.
Service monitor
Diagnostic unit for detecting faults in the appliance.
9. Preparations
Flush the water line thoroughly.
Taps/valves
Use suitable taps (see chapter "Appliance description/ Acces-
sories"). Open vented taps are not permissible.
A safety valve is not required.
Note
Never use the cross-piece to reduce the flow rate. The
cross-piece should only be used to shut off the appliance.
Permissible water pipe materials
- Cold water inlet pipe:
galvanised steel pipe, stainless steel pipe, copper pipe or
plastic pipe
- DHW outlet pipe:
stainless steel pipe, copper pipe or plastic pipe
!
Material losses
If plastic pipework systems are used, take into account the
maximum inlet temperature and the maximum permis-
sible pressure (see chapter "Specification/ Data table").
Flow rate
Ensure that the flow rate (see chapter "Specification/ Data
table", On) is sufficient for switching on the appliance.
Increase the mains water pressure if the required flow rate is
not sufficient with an open draw-off valve.
Flexible water connection lines
If the appliance is installed with flexible water connection
lines, ensure that the pipe bends do not become twisted.
Pipe bends have a bayonet fitting and are installed inside the
appliance.
Secure the back panel with an additional screw at the
bottom.
Appliance with adjustable connected load
The appliance DEL 18/21/24 SL electronic LCD is factory set to
21kW. For other outputs, proceed as follows:
Plug in the coding card according to the selected output; for
selectable output and fuse protection of the appliance, see
"Specification".
Tick the selected output on the type plate. Please use a ball-
point pen to do this.
9.1 Installation site
!
Material losses
Only install the appliance in rooms free from the risk of
frost.
Always install the appliance vertically and near the draw-off
point.
The appliance is suitable for undersink and oversink installations.
Note
Mount the appliance on a sufficiently load-bearing wall.
Undersink installation
1
2
D0000040728
1 Cold water inlet
2 DHW outlet
Oversink installation
1
2
D0000040736
1 Cold water inlet
2 DHW outlet
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