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4.4.3
Hydraulic connection of the heating circuit
Water flow in the boiler
The water flow in the boiler when the burner is operating must
correspond with the following formulae:
- Nominal water flow Qn = 0.86 Pn/20.
- Minimum flow Qmin = 0.86 Pn/45 (this flow also corresponds with
the minimum recycle flow in the boiler).
- Maximum water flow Qmax = 0.86 Pn/5.
3
Qn = flow in m
/h
Pn = Nominal output (full boiler output) in kW.
Connect the flow controller to the terminal blocks UV in the
control panel KSF CE.
Connect the flow switch to Q between terminals SK1 and SK2
on the KSF ISR control panel.
Operation in cascade
After stopping the burner:
- Timeout required before the order to close a 2 way valve: 3 min.
- Switch a possible shunt pump (located between the boiler and a
butterfly valve) off via the end of run contact of the butterfly valve.
Minimum safety valve flowrate as a function of maximum boiler nominal output
Minimum relieving capacity
Maximum gross boiler output
Unit
(a) = kW
(b) = lb/h
(c) = MBtu/h
(d) = Kg/h
16
Operation with 2-stage burner
- The water temperature in the boiler is maintained at 50°C or more;
The first stage must be set to a minimum of 30% of the nominal
stage.
- Operation at modulated low temperature (minimum outlet
temperature: 40°C); The first stage must be set to a minimum of
50% of the nominal stage.
Refer to the installation and service manual for the KSF CE
control panel.
Operation with modulating burner
- The water temperature in the boiler is maintained at 50°C or more:
The burner can modulate down to 30% of the nominal stage.
- Operation at modulated low temperature (minimum outlet
temperature: 40°C); The burner can modulate down to 50% of the
nominal stage.
Refer to the installation and service manual for the KSF ISR
control panel.
Example:
Maximum boiler nominal output is 800 kW.
Minimum safety valve flowrate must be 2600 Kg/h.
There must be no total or partial closing mechanism
between the boiler and the safety valves (France: DTU -
65.11, § 4.22 - NF P 52-203).
NXR5i
17/04/2012 - 300029103-001-01
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