REMEHA P 320 Service Manual download pdf (Page 11)

20/09/2011 - 300016243-001-D P 320

5.2 Important recommendations for connecting the boiler to the heating circuit

Installation must be carried out in accordance with the prevailing

regulations, the codes of practice and the recommendations in these

instructions.

`Minimum safety valve flowrate as a function of maximum boiler nominal output:

Minimum relieving capacity

Maximum gross boiler output

Example

Maximum boiler nominal output is 200 kW.

Minimum safety valve flowrate must be 1500 Kg/h

`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

Qn = flow in m

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: 30°C) ; The first stage must be set to a minimum of 50% of the

nominal stage

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REMEHA P 320 Service Manual Page 11