Installation manual

Commissioning
Check water flow
17
q
actual
= (T
nominal
/ T
measured
) * q
nominal
[m
3
/h]
Water flow data
R601 R602 R603 R604 R605 R606 R607
Nominal flow rate [m
3
/h] 6.1 8.1 10.2 12.2 16.3 20.4 23.1
T at nominal flow rate [ºC] 20
p at nominal flow rate [kPa] 10 18 28 15 27 42 55
Check water flow
The water flow through the boiler can
be checked with two different methods
shown below.
T measurement
Check the temperature difference over
the boiler (T flow-return) when the
boiler is running on 100% load. The
nominal T is 20K and must be at least
between 15K and 25K for secure boiler
operation. An indication of the actual
flow rate can be found with the
following calculation (see table below
for nominal data):
q
actual
= (p
measured
/ p
nominal
) * q
nominal
[m
3
/h]
p measurement
Check the pressure difference over the
boiler (p flow-return) when the boiler
pump is running (burner on is not
required). The nominal p for each
boiler type can be found in the table
below, actual p must be within:
0.35*p
nom
 P  1.75*p
nom
. An
indication of the actual flow rate can be
found with the following calculation (see
table below for nominal data):