Domestic Hot Water Circuit / Hard Water Warning / Expansion Tank - PENSOTTI PCI 34 Instruction Manual

3.5 Domestic Hot Water Circuit
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In order to prevent scaling and eventual damage to the D.H.W heat exchanger, the mains water supply must not
have a hardness rating of more than 7 grains/gal (120 ppm). It is nevertheless advisable to check the properties of
the water supply and install the appropriate treatment devices where necessary.
The cold water supply pressure at the inlet to the boiler must be between 7.25 psi (0.5 bar) and 87 psi (6 bar).
In areas with higher water inlet pressure a pressure reducing valve must be fitted before the boiler.
The frequency of the heat exchanger coil cleaning depends on the hardness of the mains water supply and the
presence of residual solids or impurities, which are often present in the case of a new installation. If the
characteristics of the mains water supply are such that require it to be treated, then the appropriate treatment
devices must be installed, while in the case of residues, an in-line filter should be sufficient.
Central heating circuit
In order to prevent scaling or deposits in the primary heat exchanger, the mains supply water to the heating circuit
must be treated according to the requirements of local standards.
This treatment is indispensable in the case where the circuit is frequently topped-up or when the system is often
either partially or fully drained.
In order to safeguard all waterside components the supplied Fernox Commissioning Kit Must be used in
its entirety.
Condensate drain
Refer to the city, town or municipality have jurisdiction for codes regarding the proper discharge of
.
condensate
The condensate drain flexible pipe supplied with the boiler must be connected to a proper condensate trap. The
condensate discharge into the drainage system is allowed providing a conde nsate trap (siphon) is installed.
Any condensate discharge pipe work external to the building (or in an unheated part of it) must be insulated to
protect against frost. Before switching the boiler On, check the correct condensate discharge.
Expansion Tank Capacity
Max. System Operating
INSTALLATION INSTRUCTIONS
Temperature (°F)
100
110
120
130
140
150
160
170
180
Maximum System Water
Content (Gals.)*
114
85
65
52
43
36
30
26
24
21