Check Gas Valve; Check Water Flow - andrews SUPAflo EVO SF60 EVO Installation And Service Manual

Commissioning

Check gas Valve

Check water flow

Gas valve
Due to the length of the chimney
system draft or a resonance can oc-
cur. This draft can have a negative
impact on the ignition and stability
of the combustion. To reduce the
influence of the draft or to remove
the resonance the flue gas valve can
be adjusted. For this 10 positions
are available, several test on diffe-
rent flue gas valves positions are to
be executed to find the optimal po-
sition for the complete installation.
Water flow data
Nominal flow rate
ΔT at nominal flow rate
Δp at nominal flow rate
Check water flow
The water flow through the boiler
can be checked with two different
methods shown below.
ΔT measurement
Check the temperature difference
over the boiler (ΔT flow-return)
when the boiler is running on 100%
load. The nominal ΔT is 20K and
must be at least between 10K and
30K for secure boiler operation. An
indication of the actual flow rate can
be found with the following calcula-
tion (see table below for nominal
data):
qactual = (ΔTnominal / ΔTmeasured) * qnominal [m
Δp measurement
Check the pressure difference over
the boiler (Δp flow-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, ac-
tual Δp must be within:
1.0*Δpnom. ≤ ΔP ≤ 4.0*Δpnom.
An indication of the actual flow rate
can be found with the following cal-
culation (see table below for nomi-
nal data):
qactual = √(Δpmeasured / Δpnominal) * qnominal [m
SF61 SF62
[m /h]
6.1 8.1
3
[°C]
[kPa] 11.2 26.8
/h]
3
/h]
3
SUPAflo EVO
SF63 SF64 SF65
10.1 12.2 16.3
20
31.2 11.9 32.3
SF66 SF67
20.4 23.1
34.3 57.1
29
EN