Commissioning
Check water flow
15
q
actual
= (
∆
T
nominal
/
∆
T
measured
) * q
nominal
[m
3
/h]
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*
Δ
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):
Water flow data
TH-L 65
TH-L 85
TH-L 100
TH-L 120
TH-L 145
Nominal flow rate
[m
3
/h]
2.6 3.4 4.0 4.8 5.6
∆
T at nominal flow rate
[ºC]
20
∆
p at nominal flow rate
[kPa]
16
29
15
22
34
