Wahl Bach 18kW User Manual page 22

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3. USER MANUAL
Description of the appliance Digital
The devices with electronic control (Digital 18, 21, 24kW) are intended for use in unvented
systems, to heat cold water to DIN 1988 and to supply one or more draw-off points.
Operation
The integrated flow control valve accommodates changes in water pressure and thus main-
tains a fairly constant temperature.
If the selected outflow temperature is not reached when the tap is fully
opened, then the water flow through the device exceeds the capacity
of the device (18, 21 or 24kW). In this case, the flow should be reduced
with the hot water valve. There is a danger of scalding at outflow tem-
peratures exceeding 43°C.
This unit is intended for use with shower heads with a low pressure
loss. Mixer taps and thermostatic mixer taps should be of a design
compatible with devices with flow control.
Fittings for vented systems should not be used!
Suggestion: T o ensure that the minimum flow (switch-on flow) of a water-pressure operated
device is reached, the pressure loss (head loss) of the device, fittings, shower head, shower
hose and piping should all be considered when installing the device.
Typical pressure losses at a shower water flow of approx. 10L/min.
• Mixer tap: 0.4 - 0.8bar
• Thermostatic mixer tap: 0.3 - 0.5bar
• Shower head: 0.3 - 1.5bar.
Model Digital 18, 21, 24kW
The electronically-regulated continuous-flow water heater with automatic performance ad-
justment keeps the outflow temperature constant. This takes place irrespective of the feed
temperature, up to the performance limit. The hot water outflow temperature is infinitely
variable.
If you have the digital instantaneous water heater:
• The appliance shall have a control panel
• with a display that is able to continuously monitor the level you have set
• there are also push-buttons to switch the appliance on and off, and the
arrows can be used to increase or decrease the temperature levels.
Without a temperature limiter, high temperatures may be reached
at draw-off points. Keep children away from the draw-off points.
Danger of scalding!
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