andrews SH60, User Manual

Page: 16 / 48

Hydraulic connection
Hydraulic connection into a system
Standard
Bypass
16
Hydraulic connection into a system
The R600 must be connected in such a
way, that a minimum flow rate of 30%
of the nominal flow rate can be ensured
at all times, independent from the flow
rate in the secundary system. This can
be achieved by using one of the follo-
wing 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 connecti-
ons for best possible efficiency (warm
and cold return)
* only applicable in single boiler instal-
lations
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
standard 3-step or a speed controlled
version. The speed controlled pump
mudulates 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 R600
can also be used without low loss hea-
der 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 con-
nection 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 perfor-
mance 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
from the boiler into the system and
vice versa.
Details of the available pump kits can
be found in the chapter „Accessories“.
Bypass
Details to the 3 possibilities mentioned
above, can be found in the next secti-
ons.
Standard