Horstmann Electronic 7 Installation Instructions page 2

1) Resetting The Unit
Sometimes electronic equipment can become scrambled or frozen. To overcome this you should
reset the unit.
This can be achieved by holding down the buttons marked "BOOST, MINUS, PLUS & SELECT"
si-multaneously.
The clock should now be adjusted to the correct time of day by following section 2 below
2) Setting Time Of Day
Adjust the hour The minutes
Press the
by pressing will now flash.
green "SET"
the white To adjust the
button until the
"MINUS" or minutes you
indicator on the
"PLUS" buttons. need to once
left hand side
 Once you are  again press the
of the screen is
happy with the "MINUS" or
next to "CLOCK".
hour selected, "PLUS" buttons.
press the blue
"SELECT" button.
3) Setting Off-Peak Heating Periods
The hour will now
flash for the 1st on
time, this can be
adjusted by pressing
Press the green SET
the "MINUS" and
button until the
"PLUS" buttons. Once
indicator on the left
 
you are happy with the
hand side of the screen
hour you have selected
is next to "OFF PEAK
press the "SELECT"
PROGRAMME"
button
The hour will be
Use the "MINUS" and "PLUS" buttons to adjust the hour.
flashing on the 2nd
When you are happy with the hour selected then press
on time, if this is not
the "SELECT" button which shall now take you to the

required then press
minutes. Press the "MINUS" and "PLUS" buttons to SELECT
the green "SET" button
the minutes you require and once you are happy with the
which will take you
minutes press the "SELECT" button.
back to the main
screen.
If your electricity tariff offers multiple off peak periods then the 2nd and 3rd off peak periods should
be set up by repeating the above procedure. Should you not require any further off-peak settings
ensure that the remaining periods are set at the same time. For example; 2nd on 12:00pm – 2nd
Off 12:00pm; 3rd On 12:00pm – 3rd Off 12:00pm (These are de-fault settings).
5
4) Default Time Settings
DEFAULT TIMES
1st ON 1st OFF
2:15am 7:15am
After re-setting the unit the off-peak heating times will revert back to the default factory settings,
these are shown above, however if you wish to change these times please proceed as instructed in
the SETTING OFF-PEAK HEATINGS PERIODS part of this manual (3).
5) Completing The Installation
Once you are To assemble the controller to its mounting box, first push the connectors numbered 1-5 into the
happy with the
corresponding numbered terminal as shown in Fig.1
time selected,
Carefully offer the controller to the box and secure with the fixing screws, ensuring the wiring does
press the blue
not become damaged.
"SELECT" button,
Switch on the mains supply and put the rocker switch in the TIMED position.
 this will now
6) Questions
take it back
to the "RUN"
(Q) There is no display on the screen?
position on the
(A) Ensure there is mains supply getting to the unit and that the battery switch on the rear of the
left hand side of
unit is in either the GMT/BST or GMT ONLY position.
the screen.
(Q) The display has become frozen?
(A) This could be due to local electrical interference. Using the RESET procedure in this manual may
rectify the fault.
(Q) How do I change the back-up battery?
This will then make (A) The back-up battery is integral to the unit and will save the settings for at least two years if the
the minutes flash,
power is disconnected. The battery is NOT replaceable and any attempt to remove it will invalidate
which can be adjusted
the warranty.
by pressing the
Specification
"MINUS" and "PLUS"
13A 230V AC 50Hz
buttons as required.
Suitable for immersion heaters up to 3kw
Once you are happy
with the minutes, Type 1 control; Type 1B disconnection
press the "SELECT"
Live Parts - Enclosed
button to take you to
Pollution degree 2
the 1st off time
Shock protection - Class 1
Contacts - Micro disconnection
Class A software
Impulse rating = 4000v
Battery Reserve - approximately 2 years total power disconnection
Size - 170mm x 115mm x 60mm (excluding rocker switch)

South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP
6
2nd ON 2nd OFF 3rd ON 3rd OFF
12:00am 12:00am 12:00am 12:00am
Horstmann Controls Limited
Tel: 0117 9788 773 Fax: 0117 9788 701
E-mail: sales@horstmann.co.uk
Web site: www.horstmann.co.uk
Leaflet number NP0083080000 – Issue 2
Electronic 7 Installation Instructions
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 IEE 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.
TIMED
RUN
AM
CLOCK
BOOST PROGRAMME
ISOLATE
OFF PEAK PROGRAMME
MAINS
BEFORE
OPENING
OR
SERVICING
IMMERSION
HEATER(S) SET MINUS PLUS
OFF
SWITCHED
OUTPUT
TIMED
.
SUMMER
WINTER
TIMED BOOST
SELECT
1