Check Water Flow - elco THISION L 50 Notice D'installation Et D'emploi

Commissioning

Check water flow

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 10K and 20K 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 = (∆T / ∆T
actual nominal measured
∆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:
1.0*Δp ≤ ∆P ≤ 4.0*∆p
nenn
cation of the actual flow rate can be
found with the following calculation (see
table below for nominal data):
q = √(∆p / ∆p
actual measured nominal
Nominal flow rate
∆T at nominal flow rate
∆p at nominal flow rate
3
) * q [m /h]
nominal
. An indi-
nenn
3
) * q [m /h]
nominal
Water flow data
TH-L 50 TH-L 65
3
m /h 1.9 2.6
K
kPa 9 16
TH-L 85 TH-L 100 TH-L 120
3.4 4.0 4.8
20
29 15 22
TH-L 145
5.6
34
17