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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 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
= (∆T
/ ∆T
) * q
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:
0.35*Δp
≤ ∆P ≤ 1.75*∆p
nom
nom
cation of the actual flow rate can be
found with the following calculation (see
table below for nominal data):
q
= √(∆p
/ ∆p
) * q
actual
measured
nominal
Nominal flow
∆p at nom. flow
Nominal flow
∆p at nom. flow
Nominal flow
∆p at nom. flow
Nominal flow
∆p at nom. flow
All manuals and user guides at all-guides.com
3
[m
/h]
nominal
. An indi-
3
[m
/h]
nominal
Flow rate R3401 - R3405 at ∆T 20K
R3401
3
[m
/h]
28.5
[kPa]
46
Flow rate R3406 - R3410 at ∆T 20K
R3406
3
[m
/h]
51,6
[kPa]
58
Flow rate R3501 - R3505 at ∆T 20K
R3501
3
[m
/h]
26,4
[kPa]
37
Flow rate R3600SB - R3605SB at ∆T 20K
R3600SB
3
[m
/h]
24,7
[kPa]
48
R3402
R3403
R3404
31.6
37.0
41.8
53
36
R3407
R3408
R3409
56,1
64,1
72,1
91
60
130
R3502
R3503
R3504
30,8
34,9
39,0
25
30
R3601SB
R3602SB
R3603SB
27,6
32,2
36,5
56
38
R3405
46.8
43
50
R3410
80,1
165
R3505
43,0
35
40
R3604SB
R3605SB
40,8
45,0
45
53
60
29
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