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5.2.2
Electrical supply
22
The R18 series of water heaters are suitable for connection to a
25 mbar gas network.
The minimum supply pressure must never fall below 18 mbar.
With a lower gas pressure it is possible that the water heater
will not run at 100% capacity. At the same time the water heater
can be more prone to failures.
Adjust the burner pressure with a supply pressure of 20 mbar
before the water heater.
The product has to be installed by a recognised installer fully
according to the current national and local requirements, norms
and standards.
The water heater is wired according to the circuit diagram which
is supplied with the water heater. The water heater must be
protected by a 6 amp fuse.
The water heater must have an electrical supply voltage of 230
VAC. Do not cross connect 'live' and 'neutral'!
'Live' is connected to the terminal marked with "L" (brown), and
'neutral' is connected to the terminal marked with "N" (blue).
'Earth' is connected to the terminal " " (yellow/green).
Fig. 18 Electrical terminal block
External control
It is possible to externally control the unit. The following termi-
nals on the terminal block have the following functions:
1
1
-
2*
1
-
3
4
-
5*
6
-
No
M6
-
XU6 0 - 10 VDC control signal
32
-
No
A
-
No
For more information on the RWF40 see par. 2.3.2
* remove jumper.
18IP22B
common
up signal
down signal
enable
cascade signal (240 V)
external main gas valve
alarm signal (240 V)
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