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4.5 Hydraulic connections
4.5.1
Regulations
Installation must be carried out in accordance with the prevailing
regulations, the codes of practice and the recommendations in these
instructions.
France: Heating installations must be designed and constructed in
such a way as to prevent the return of water from the heating circuit
and products put into it into the drinking water network located
upstream; the installation must not be in direct relation with the
drinking water network (Article 16-7 of the departmental health
Directive).
4.5.2
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
(see chapter: Technical characteristics)
3
Qn = flow in m
/h
Pn = Nominal output (full boiler output) in kW.
- 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
- Example of calculation:
Pn = 93,4 kW
Qn = 0,86 x 93,4 : 20 = 4 m
Qmax = 0,86 x 93,4 : 5 = 16 m
4.5.3
Hydraulic connection of the water circuit for domestic use
See: Domestic hot water calorifier instructions
4.5.4
Water discharge connection (Sludge removal)
A tapped Ø Rp 2 1/2 hole with a plug has been provided on the
bottom of the front of the boiler.. Fit a 1/4 turn valve (not supplied) on
the opening to remove the sludge.
Sludge removal leads to the draining of large quantities of water, so
remember to refill the system after the operation.
In the case of installation on an old network, we strongly
recommend carrying out "desludging" and careful rinsing of the
installation before you install the new boiler. Install a sludge
decanting pot on the return pipe, very close to the boiler.
22
3
/h
3
/h
When these installations are fitted with a filling system connected to
the drinking water network, they comprise a CB disconnector
(disconnector for zones with non-controllable pressure differences)
which satisfy the functional requirements of the NF P 43-011
standard.
Water flow rate in the heat pump condenser :
- Nominal water flow / Maximum water flow: 1/3 of the boiler's water
flow rate
- Minimum water flow : 1/10 of the boiler's water flow rate
Operation in cascade
After stopping the burner:
- Timeout required before the order to close a butterfly 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
GTU C 330
07/04/2009 - 300016152-001-C
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