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Doc890/3456CV02B 29
35 - 36 Calorifi er temperature sensor*. After a suitable sen sor has been connected it will
be automatically re cognised when the power supply voltage is switched on. The
terminals 34 - 35 must not be intercon nected. The purpose of this function, in
comparison with the calorifi er thermostat, is to make possible a night time tem-
perature reduction and an anti- legionel la switching (only with BME, E6 or KKM).
37 - 38 External infl uence (2 - 10 VDC = +10°C - +90°C)*. At voltages below 2 V the
boiler will switch to “con stant supply temperature operation”.
39 - 40 Output capacity signal*. This signal provides infor mation for a capacity display.
0-100 % = 0-10 VDC. The maximum current is 0.5 mA. For higher currents or long
connecting wires (›5 m) the use of a signal ampli er is recommended.
41 - 42 Bus connection.
43 - 44 Primary boiler pump control (0-10 Vdc) (not applica ble for R3400 series boilers)
y
* In order to avoid faults caused by inductive currents, static electricity or high frequency sig-
nals, the use of screened cables is necessary.
5.3.3 Water connections
The appliance must be installed by a recognised installer in accordance with the applicable na-
tional and local specifi cations and regulations. The fl ow and return connec tions are made at the
rear of the unit.
Supports for water connections
It is recommended that the fl ow and return pipes be properly supported. This will avoid damage
through overloading (weight) and simplifi es maintenance.
Fig. 17 Support
The R3400/R3500/R3600 units are constant water fl ow appli ance and are suitable for use in both
open vented (non-pres surised) systems and sealed (pressurised) systems provided the minimum
pressure requirements, as per table 14, are met. The unit is fi tted with a boiler pump as standard
and which guarantees the required water circulation throu gh the boiler. The capacity and working
head of the pump is suf cient to overcome both the resistance of the boiler and some resistance
offered by the system.
w
The boiler pump is however not a system pump
If the resistance of the system exceeds the available working head, the boiler will be shut down
by the fl ow switch. In order to prevent this happening, the length and diameter of the primary
pipework between the boiler and the low velocity header must be chosen such that the remaining
working head of the pump (see table 12) will not be exceeded.
It is recommended that manually operated valves be fi tted between the water connections and
the installation.
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