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8. Electrical installation
WARNING: THIS EQUIPMENT MUST BE EARTHED.
All electrical wiring must be carried out by a competent person and in accordance with the
current I.E.E. Wiring Regulations.
A suitable “Earthing” point is provided on the cylinder
pedestal directly below the immersion heater (see Fig 1)
The control equipment supplied will ensure that the cylinder functions safely. From an economic
and convenience point of view, it is intended that these controls operate in conjunction with
other control packages for example Honeywell “S”,“W” or “Y” plan systems, which incorporate
a programmable time clock etc.
8.1.The immersion heater
-A 3kW 230v 50Hz immersion heater is pre fitted to the cylinder at
the factory. It should be wired in accordance with the instructions given in Fig 7. The cable
MUST be routed through the strain relief bush. We recommend that the control thermostat is set
at 60 C, the high limit trip is factory set at 85 C. The immersion heater conforms with EEC
Directive 76/889 for radio interference and complies with BS 800:1977.
WARNING:
Never fit an immersion heater without a thermal cut-out.
8.2.The indirect temperature controller
-The control and high limit thermostat for use with
indirect systems is supplied separately with the unvented hot water safety kit. It should be fitted
into the sensor pocket in the cylinder (see Fig 1 for position). The control thermostat has an
adjustment range between 30 C and 90 C, however it is recommended this it be set to 60 C
WARNING:
The manual re-set high limit thermostat
MUST NOT
under any circumstances be
bypassed. This is pre-set to 80 C and to prevent nuisance tripping the control thermostat should
always be at least 15 C below this.
8.3. The 2 port valve -
To prevent gravity circulation when the boiler switches off, the 2 port
motorised valve supplied with the unvented hot water kit MUST be fitted in the primary flow
pipe to the cylinder and wired in accordance with Figs 2,3,or 4 (depending on system design), to
comply with current legislation.
