4.4. Duo
ä Caution!
Connect the water heater supply via an external timer to use off-
peak tariff electricity (variable rate plan).
ä Caution!
Use a multi-core power cable (minimum H05VVF) 4 x 2.5 mm²,
with wire end ferrules.0
a) Connect the power cable to the terminal block in accordance
with the following instructions:
Colour Function
Green/yellow Earth
Black Live off-peak
Brown Live peak
Blue Neutral
b) Secure the strain relief by tightening the two screws.
c) Replace the closing cap on the heater.
ä Caution!
Do not turn on the power to the appliance yet. Only do so when
this is expressly required during commissioning.
• Filling and first use on page 22.
4.5. Electrical diagram
Mono Mono-plus
Mono-3 Duo
3 ~400 V
3 ~230 V
(5250 W)
L1 L2 L3
Thermostat
(adjustable)
Safety
thermal cut-
out
Boost timer
20