Rendamax R3456 EVO, Manual, Page: 31 / 72

Hydraulic connection
Hydraulic connection into a system
Standard
Bypass
Hydraulic connection into a system
The R3456 EVO must be connected in
such a way, that a minimum flow rate of
30% of the nominal flow rate of R3500
EVO and R3600 EVO versions can be
ensured at all times, independent from
the flow rate in the secundary system.
This can be achieved by using one of
the following 3 possibilities:

Standard, with low loss header or
plate heat exchanger

Bypass, with integrated minimum flow
rate by Bypass pump*

Split System, with 2 return
connections for best possible
efficiency (warm and cold return)*
* only applicable in single boiler
installations
Standard
This is the most common way to
connect the boiler to the system. By
using a low loss header or plate heat
exchanger a minimum flow rate can be
ensured at all times, independent from
the flow rate in the secundary system.
The boiler pump is available as a speed
controlled version. The speed
controlled pump modulates the flow
rate in the primary system in parallel
with the burner load. This ensures the
lowest possible return temperature to
the boiler for high efficiency usage.
Details of the available pump kits can
be found in the chapter „Accessories“.
Bypass
In single boiler installations, the R3456
EVO can also be used without low loss
header or plate heat exchanger. For
this solution a bypass kit is available as
accessory to the standard boiler. The
bypass is connected between the flow
connection and the second return
connection of the boiler.
The performance of the bypass pump is
very low when the system flow rate is
high. As soon as the system flow rate
decreases, the bypass pump
performance increases to ensure a
minimum flow rate through the boiler.
The bypass pump does not transport
the water from the boiler into the
system. The system pump should
overcome the boiler resistance at
nominal flow rate to transport the
water from the boiler into the system
and vice versa.
Details of the available pump kits can
be found in the chapter „Accessories“.
Details to the 3 possibilities mentioned
above, can be found in the next
sections.
Bypass
Standard
30