Section 12. Electrical - Worcester Highflow 3.5 OF Installation And Servicing Instructions

2. HOT SUPPLY AND FLOW REGULATING
The appliance is fitted with a water flow regulator.
The maximum flow of domestic hot water available
through the appliance is limited to 1 5 litres/min. (3. 3
gall./min.).
NOTE: The flow regulator contained within the flow
regulator housing is plastic. Do not heat the housing during
soldering operations on adjacent joints, e.g. remove and
replace after soldering.
3. TAPS AND VALVES
Hot and cold taps and mixing valves used with this
appliance must be suitable for operating at ma1ns
pressure.
4. SHOWERS I FIXED HEAD TYPE)
No anti-syphonage arrangements are necessary.
5. SHOWERS (LOOSE OR FLEXIBLE HEAD TYPE!
If
a
loose head shower with flexible hose is to be used over
a bath. the hose must be fixed sothatthe head cannot fall
12.
ELECTRICAL
See Figs. 9,
10 and 1 1
NOTE: Switch off the mains supply before removing the
control box cover in order to gain access to the electrical
terminal strip.
(al Remove the cabinet top panel by snatching squarely
upwards.
(b) Release the five pozi-d rive screws securing the cover of
the electrical control box and remove.
ROOM AND FROST THERMOSTATS
If a room or frost thermostat is to be fitted, it should be wired
into the appliance terminal strip as shown in Fig. 8. One or both
of the blanking plugs should be removed from the electrical
cover and the cable passed through the hole. A Heyco cord
strain relief bush, packed separately with these instructions,
should be used to retain the cables at this point. The cables
should then be clipped into the cable retaining clip fixed to the
left hand side panel. Care should be taken that the cables are
clipped neatly into place.
MAINS WIRING
The method of connection to the appliance must facilitate the
complete isolation of the appliance, preferably via a 3 amp
fused three-pin plug and unswitched shuttered socket outlet,
both complying with the requirements of BS 1 363.
Alternatively connection may be made via a double pole
isolator with a contact separation of 3 mm in all poles and
supplying the boiler and system controls only.
Mains Cable: 0. 75 mm
2
(24 x 0.20 mm). Should the factory
fitted mains cable need to be replaced then the new cable must
be connected into the terminals marked live, Neutral and Earth
at the left hand side of the appliance terminal strip. The cable
should then be passed through the cable clamp located in the
9
closer than 13 mm (0. 5 in.} above the top edge of the bath
in order that the head is prevented from being immersed
·In bath water, or the shower must incorporate or be fitted
with an anti"syphonage device at the point of flexible hose
connection.
6. BIDETS
The supply of hot and cold mains water direct to a b1det
is permitted provided that the bidet is of the over- rim
flushing type. The outlet(s) should be shrouded and
unable to have any temporary hand helc spray attached.
No anti-syphonage arrangements are necessary
7. USE IN HARD WATER AREAS
If the appliance is used in any area where the temporary
hardness exceeds
200 ppm a 'Worcester ln-L1ne' scale
inhibitor (available from Worcester Engineer'1ng Co. Ltd.)
should be fitted into the cold supply to the appliance.
Installation should be strictly in accor-dance with the
requirements of the local water undertaking. An Isolating
valve to facilitate serv1cing may be incorporated.
left hand side of the electrical cover and clipped into the two
cable retaining clips fixed to the left hand side panel. Care
should be taken that the cable is clipped neatly into place. All
the external wiring shall comply wrth current lEE w1r1ng
regulations, and any local regulations wh1ch apply. The
appliance must be earthed.
SAFETY CHECK
In the event of an electrical fault after installatiOn of the
appliance, preliminary electrical system checks shall be carried
out (i.e. earth continuity, polanty and resistance to earth. etc., l
as described in the British Gas Multimeter Handbook.
Fig. 8. Room Thermostat and
Frost Thermostat Connections.
ROOM THERMOSTAT
CONNECTIONS
FROST THERMOSTAT CONNECTIONS
A SUITABLE 2-POLE
FROST THERMOSTAT
240¥- 50Hz
BOILER MAINS
SUPPLY
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