DE GB
13
Description of the appliance
model:
Hydrex 18, 21, 24 kW
model:
Elex 18, 21, 24 kW
model Elex/ Hydrex 18, 21, 24 kW
The flow control valve accommodates changes in water pressure and thus maintains a
fairly constant temperature. The valve limits the flow to increase the temperature of the
supplied water.
If the selected outflow temperature is not reached when the tap is fully opened, then the
water flow through the unit exceeds the capacity of the heater (18, 21 or 24 kW). In this
case, the flow should be reduced with the hot water valve. There is a danger of scalding
at outflow temperatures exceeding 43°C.
This unit is intended for use with shower heads with a low pressure loss. Mixer taps and ther-
mostatic mixer taps should be of a design compatible with instantaneous water heaters
with flow control.
Fittings for vented systems should not be used!
Suggestion:
To ensure that the minimum flow (switch-on flow) of a water-pressure operated instanta-
neous water heater is reached, the pressure loss (head loss) of the heater, fittings, shower
head, shower hose and piping should all be considered when installing the unit.
Typical pressure losses at a shower water flow of approx. 10 l/min.
Mixer tap: 0.4 - 0.8 bar
•
Thermostatic mixer tap: 0.3 - 0.5 bar
•
Shower head: 0.3 - 1.5 bar.
•
The power controller automatically selects one of the two power settings (blue = econo-
my; red = nominal power), depending on the flow.
Blue (Economy): for sinks, bidets and showers (approx. 50° C). At this setting the units ope-
rates at approximately 2/3 power.
Red (Full power): for kitchen sinks (washing-up), baths and intensive cleaning (approx. 70°
C). At this setting the unit operates at full power.
The unit has push-buttons to switch it on and off, and arrow keys (
↑
↓
) to adjust the hea-
ting . Blue: decrease heating performance, red: increase heating performance.
For sinks, bidets and showers (approx. 50° C). At this setting the units operates at approxi-
mately 2/3 power.
For kitchen sinks (washing-up), baths and intensive cleaning (approx. 70° C). At this setting
the unit operates at full power.
Without a temperature limiter, high temperatures may be reached at draw-off points.
Keep children away from the draw-off points. Danger of scalding!
The unit should be isolated from the electricity supply before any work is done on live
components.
Remove the fuses or isolate the unit in another way.
The main water valve should be closed before any work is done on the water pipe.
If the water supply is interrupted, e.g. due to maintenance on the mains water supply,
then the following steps should be undertaken before returning the unit to operation:
1. Remove the fuses or isolate the unit in another way.
2. Open a hot water valve connected to the unit until the air is vented from both the unit
and the cold water supply pipe.
3. Replace the fuses or reconnect the supply.
This unit requires a 400 V, three-phase supply. If the electrical installation does not meet
these requirements then it will need to be modified. This should be done by a qualified
electrical installer, in accordance with the relevant regulations (IEEE, etc.).
