Alarko HARMONY - D, Инструкции по установке и обслуживанию, Страница: 48 / 72

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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 fitted.
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
flow 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
flushing bidet subject to Local Water Company requirements.
• In all mains pressure systems, the flow 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 flow 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 beneficial.
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.