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4. Installation
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.
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.
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.
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
14
PK 550
18/03/2016 - 300020192-02
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