Horstmann electronic 7 Installation Manual

The Horstmann Electronic 7 is an advanced water heating control, which can be
programmed to take advantage of cheap night-rate electricity, so that there is a tank
of hot water available for the morning.
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A
SUITABLY QUALIFIED PERSON AND IN ACCORDANCE WITH THE CURRENT
EDITION OF THE IET WIRING REGULATIONS.
WARNING : ISOLATE MAINS SUPPLY. BEFORE COMMENCING INSTALLATION
ENSURE THE UNIT IS PROPERLY EARTHED.
The Electronic 7 is supplied with its own surface mounting box, which can also be
mounted over a single or double gang flush wall box. It should NOT be mounted on
an unearthed metal surface. Means of disconnection from the supply having at least
3mm contact separation in both poles must be incorporated in the fixed wiring.
Horstmann recommends a separate fused circuit from the consumer unit (24 Hour
supply) protected by a 15 amp HRC fuse or, preferably, a 16 amp MCB. In some
cases immersion heater failure can damage the ELECTRONIC 7. Installation of a
100 mA RCD will provide additional protection for the unit. If the ELECTRONIC 7 is
to be connected to a ring main then the spur feeding the controller should be
protected in the same way.
Electronic 7
Installation Instructions
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