Check Water Flow - Rendamax R3400 Betriebs- Und Installationshandbuch

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