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Commissioning
32
Check water ow
Check water ow
The water ow through the boiler
can be checked with two di erent
methods shown below.
ΔT measurement
Check the temperature di erence
across the boiler (ΔT ow-return)
when the boiler is running on 100%
load. The nominal ΔT is 20K and must
be at least between 10K and 30 K
for
secure boiler opera on. An indica on
of the actual ow rate can be found
with the following calcula on (see
table below for nominal data):
Δp measurement
Check the pressure di erence over
the boiler (Δp ow-return) when the
boiler pump is running (burner on is
not required).
The nominal Δp for each boiler type
can be found in the table below,
actual Δp must be within:
1.0*Δpnom. ΔP 4.0*Δpnom.
An indica on of the actual ow rate
can be found with the following
calcula on (see table below for
nominal data):
q
actual
= (ΔT
nominal
/ ΔT
measured
) * q
nominal
[m
3
/h]
q
actual
= (Δp
measured
/ Δp
nominal
) * q
nominal
[m
3
/h]
Water ow data THISION L EVO
60 70 80 100 120 140
Nominal ow rate [m
3
/h] 2,4 2,8 3,2 4,0 4,8 5,6
ΔT at nominal ow rate [°C] 20
Δp at nominal ow rate [kPa] 15 18 22 7 911
30


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