Worcester 47 311 43, Инструкция по установке и обслуживанию

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circumstances a device to prevent scale formation can be fitted.
Installation of a scale inhibitor assembly should be in accordance
with the requirements of the local Water Company. An isolating
valve should be fitted to allow servicing. The water hardness
can be determined using a standard test paper or by reference
to the local Water Company.
9 Electrical
See Fig. 10.
9.1 MAINS SUPPLY.
230 V ~, 50 Hz, 180 watts.
External Fuse: 3A.
Internal Fuses: T2.5A, 250V and T2.0A, 250V.
9.2 It must be possible to completely isolate the appliance.
9.3 The following connection alternatives must be used:
A 3 amp fused three-pin plug and unswitched shuttered socket
outlet (both complying with the requirements of BS 1363) or a
double pole isolator with a contact separation of 3mm in all poles
and supplying the appliance and controls only.
9.4 The appliance must be earthed.
9.5 Mains Cable. 0.75mm2 (24 x 0.20mm) to BS 6500 Table
16.
9.6 The wiring between the appliance and the electrical
supply must comply with current IEE Wiring Regulations and
any local regulations, which apply.
9.7 If a room thermostat and/or external programmer are to
be fitted refer to Figs. 8 and 9. The devices must be suitable for
use with mains voltage.
9.8 Facia mounted programmers are available as optional
extras. Instructions are supplied with the programmer kits.
9.9 A time switch or programmer can be fitted externally to
the appliance (see Figs. 8 and 9).
9.10 The use of a frost thermostat is not recommended since
the boiler provides internal automatic protection, as long as the
mains switch on the boiler is in the on position. However, if frost
protection is necessary for the system, please contact the
Worcester Heat Systems Technical Helpline (0990) 266 241.
9.11 SAFETY CHECK.
After installation or in the event of an electrical fault the electrical
system shall be checked for short circuits, fuse failure, incorrect
polarity of connections, earth continuity and resistance to earth.
8 Hot Water Supply
8.1 The following are general requirements and, if necessary,
reference should be made to the local Water Company before
fitting the appliance.
8.2 MAINS COLD WATER INLET. Devices capable of
preventing the flow of expansion water must not be fitted unless
separate arrangements have been made.
8.3 The final 600mm of the mains cold water connection to
the appliance should be made in copper tube only.
8.4 The appliance is suitable for a mains pressure of up to
12 bar (180 lb/in2).
8.5 The appliance is fitted with a mains supply isolating valve.
8.6 The maximum domestic hot water flow rate is 13.0 litres/
min (±15%) (2.9 gallons/min).
8.7 In winter (when the mains inlet water temperature is
lower) a reduced flow rate at the taps may be required to achieve
the type of hot water delivery temperature available in warmer
weather.
8.8 It is suggested that long pipe runs to the taps or shower
should be insulated to prevent the rapid cooling of domestic hot
water after a tap or shower has been turned off.
8.9 Hot and cold taps and mixing valves used with this
appliance must be suitable for operating at mains pressure and
temperatures of 65°C.
8.10 No anti-syphonage arrangements are necessary except
for some loose head showers. See also Section 8.11 following.
8.11 Thermostatically controlled or pressure equalising
shower valves will guard against the flow of water at too high a
temperature.
8.12 The head of a loose head shower must not fall closer
than 25mm (1in) above the top edge of the bath to prevent its
immersion in bath water. Alternatively the shower must be fitted
with an anti-syphonage device at the point of the flexible hose
connections.
8.13 The supply of hot and cold mains water direct to a bidet
is permitted, (subject to local Water Company requirements),
provided that the bidet is of the over-rim flushing type. The
outlet(s) should be shrouded and unable to have any temporary
hand held spray attached. No anti-syphonage arrangements
are necessary.
8.14 As the control circuit limits the maximum temperature of
the Water to Water heat exchanger, there is normally no need
for water treatment to prevent scale accumulation. In exceptional
E081_027
Fig. 8 - 230 V room thermostat connections Fig. 9 - 230 V programmer connections