Instruction manual

23
Instructions for the installer
3.14 - MIXING HEADER AND PLATE HEAT EXCHANGER
In order to ensure correct boiler operation it is necessary to
use a mixing header which guarantees:
- the separation and collection of circuit dirt
- optimal air venting
- hydraulic de-coupling of the two hydraulic circulation
circuits
- balancing of the circuits
A suitably sized plate heat exchanger has the advantage of
separating the two circuits (primary and secondary), permit-
ting the installation of the boiler in an industrial design.
Perdita di carico lato acqua
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 55000
Q : portata acqua (l/h)
perdita di carico (mmh2O)
PK348X 2S
Q: water flow rate (l/h)
Pressure losses (mmH2O)
WATER SIDE PRESSURE LOSSES
3.13 - FROST PROTECTION
If the flow temperature (measured at global flow NTC) falls
below 7°C, the system pump circulates water around the
water circuit and all the heat modules will operate at
minimum output.
Note: The anti-freeze solution must be compatible with the
materials used on the entire heating system and tolerable
with aluminium alloys.
WARNING:
If the boiler has remained unused for a long
period, and you notice the presence of
frost (temperatures of < 3°C), do NOT fire
the boiler. Fire the boiler only of you know
that an anti-freeze solution has been
added in the proper percentage to the
primary circuit.