R3400 Technical data - Rendamax

Rendamax
The connection to the drain must be arranged such that there is an open connection under the
condensate discharge point on the appliance (see fig. 23). In addition, the discharge pipe must be
fitted with a trap (U-bend) in accordance with the applicable regulations.
Ensure that the distance between the condensate discharge point of the boiler trap and the drainage
pipe is at least 5 mm. This provides the required open connection and simplifies any subsequent
maintenance activities and inspections.
Fig. 23
Condensate discharge
5.4 Hydraulic system
5.4.1 General
Although it is not the intention to provide a complete handbook covering the most divergent
hydraulic systems, the data is more extensive than would generally be provided in the case of
conventional central heating boilers.
The R3400/R3500/R3600 units are low water content boilers for which the water flow rates must
be within minimum and maxi mum values.
Table 12 - 14 lists the required relationship between the three parameters Q (water flow), P (pressure)
and t (temperature) at maximum capacity. Because of the high flow rate, the appli ance is
less sensitive to water hardness. Therefore, the water hardness may not exceed 250 ppm with a
supply temperature of 80°C (see 5.4.5 Water quality).
5.4.2 Water flow
5.4.2.1 Flow rate and resistance
The rate of water flow through the appliance must never fall below the required minimum (otherwise
the water flow switsch will be activated and the appliance will be shut down). The use of
valves, non-return valves, systems in which several appli ances are connected to a common transport
system, etc., must not interfere with the required water circulation.
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