Technical data

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• Asthemaximumtemperatureofthesecondary(water-to-water)heat
exchanger is limited by the control circuit, there is normally no need
for water treatment to prevent scale accumulation. In exceptional cir-
cumstancesadevicetopreventscaleformationcanbetted.
4.3.2.1 Showers, Bidets, Taps and Mixing Valves
• Hotandcoldtapsandmixingvalvesusedinthesystemmustbe
suitable for operating at mains pressure.
• Thermostatically controlled shower valves will guard against the
owofwaterattoohighatemperature.
• Ifusingapressureequalizingvalve,setthedomestichotwatertem-
perature control knob to the maximum (hottest) position.
• Hotandcoldmainsfedwatercanbesupplieddirecttoanover-rim
ushingbidetsubjecttoLocalWaterCompanyrequirements.
• Inallmainspressuresystems,theowofwaterfromindividualtaps
will vary with the number of outlets operated simultaneously and
with the cold water mains supply pressure to the property. Flow
balancing of water draw-off circuits (e.g. via using ‘Ball-o-Fix’ type
valves)isrecommendedtoavoidexcessivereductioninowtoindi-
vidual outlets. For further information and advice contact the boiler
supplier.
4.3.2.2 Water Quality
If the appliance is installed in a hard water area, say over 150 ppm tem-
poraryhardness,theuseofanin-linescaleinhibitormaybebenecial.
Consult the water supplier in the case of doubtfulness.
4.3.2.3 Water Pressure
Whilst the boiler will operate at a low water inlet pressure, to obtain the
full boiler output 0.2 bar dynamic inlet pressures will be required.