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26 Doc890/3456CV02B
The gas connection is made at the rear of the boiler.
Types R3401, R3402, the R3501 - R3505 and R3601 - R3605 are not suitable for immediate connec-
tion to a 100 mbar natural gas system (as option 100 mbar). The pressure of the gas sup-plied to
the unit must be reduced to 25 mbar for natural gas or 50 mbar for propane with the use of a gas
pressure regulator.
From type R3403, all boilers are suitable for gas supply pres sures of 100 mbar on natural gas.
The loss of pressure in the connecting pipes must be such that, at maximum boiler capacity, the
pressure must never fall below 18 mbar for natural gas or 50 mbar for propane.
5.3.2 Electrical connection
The electrical connections and provisions must comply with the applicable national and local
standards and regulations.
The units are wired in accordance with the electrical diagram supplied with the appliance.
w
The electrical connections, the terminals and the boiler pump relay are mounted in a separate
connection box behind the front panel (extrusion profi le, fi g. 4).
This front panel can be simply removed by pulling the lower edge of the panel forward. Behind
this panel are two cover plates which can be removed by unscrewing the M5 bolts. The terminal
strip with the connection clamps are mounted behind the lower cover plate.
The cables to be connected (power supply, control) enter the appliance via the rear of the unit,
and pass via the cable duct at the inner right hand side to the connection box at the front of the
unit. The connection box is provided with cable glands and connection terminals. The boiler pump
is provided with thermal protection and a pump relay.
control panel
transformer 230-24-25V
CXE/EM
mains filter
frequency converter
cable glands
boiler pump relay
terminal strip with
terminal functions
Fig. 16 Connection box
The appliance can be switched on and off with the switch on the control panel. The power supply
voltage cannot be removed from the boiler pump relay in this way.
x
The installer must fi t a mains isolator switch in the power supply to the unit within the boiler
room. This can be used to switch off the power to the unit for maintenance purposes or in the
event of a problem.
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