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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 follo-
wing 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 requi-
red). The nominal p for each boiler
type can be found in the table below,
actual p must be within:
0.35*Δp
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):
19


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