Horstmann Electronic 7 User Manual

The simple instructions in this user guide are designed to help you with programming and operation
of the unit.

LCD Display: The LCD display allows the user to view the current time and set programme times.
Indicators: Illuminated indicators give a visual feedback to the user indicating the status of the
programmes or boost operation.
Key:
1 – Timed display indicator
2 – LCD Display
3 – Boost Button
4 – Switched Output control
Manual Boost:
To use the manual boost, press the “BOOST” button on the unit which will then boost your tank for
1 hour and then switch off.

THE BOOST WILL NOT OPERATE OR WILL BE CANCELLED DURING TIMED HEATING PERIODS

Switched Output

In the “OFF” position the electrical supply to the immersion
heater(s) is disconnected even though the clock, display and
indicator lights continue to operate. In the “TIMED” position the
over-night immersion heater will be switched on and off at
the programmed switch-time settings, at other times the boost
facility is available.

Time Display

The Electronic 7 is fitted with an automatic clock that is pre-set on manufacture and should not
normally require any adjustments by the user.

The summer/winter setting is automatically selected and will automatically change.

This is indicated on the screen next to the appropriate setting.

Therefore no adjustment is needed to be made by the user for the summer/winter clock change.

Should a minor correction to the clock be necessary or if the unit has been reset then see the
section on setting the clock.

On installation the installer will have selected whether the Electronic 7 will switch at GMT times
throughout the year or whether the timings need to alter as the clocks change.

For example:

GMT/BST – Switching time will be changed by one hour. In the GMT/BST mode the clock display will
match the actual switching time.

GMT ONLY – Switching will always take place at GMT times (summer and winter). Although the
clock display will show the correct time.

Setting Time Of Day

BOOST

TIMED

OFF

TIMED

ELECTRONIC 7

SWITCHED
OUTPUT

SET

MINUS PLUS SELECT

RUN

ISOLATE
MAINS
BEFORE
OPENING
OR
SERVICING
IMMERSION
HEATER(S)

SUMMER

WINTER

TIMED BOO ST

CLOCK

BOOST PROGRAMME

OFF PEAK PROGRAMME

AM

Setting Off-Peak Heating Periods

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 “BOOST, MINUS, PLUS & SELECT” simultaneously.

The unit will now revert back to pre-set factory default off peak times and the current time will
show the time as it was at the time of re-set. The hour will be flashing and should be adjusted as
detailed in the section ‘Setting the time of day’.

TIMED

RUN

SUMMER

WINTER

TIMED BOOST

CLOCK

BOOST PROGRAMME

OFF PEAK PROGRAMME

AM

2

3

4

The Electronic 7 – an overview

BOOST

TIMED

OFF

TIMED

ELECTRONIC 7

SWITCHED
OUTPUT

SET

MINUS PLUS SELECT

RUN

SUMMER

WINTER

TIMED BOOST

CLOCK

BOOST PROGRAMME

OFF PEAK PROGRAMME

AM

Press the
green “SET”
button until the
indicator on the
left hand side
of the screen is
next to “CLOCK”.

Adjust the hour
by pressing
the white
“MINUS” or
“PLUS” buttons.
Once you are
happy with the
hour selected,
press the blue
“SELECT” button.

The minutes
will now flash.
To adjust the
minutes you
need to once
again press the
“MINUS” or
“PLUS” buttons.

Once you are
happy with the
time selected,
press the blue
“SELECT” button,
this will now
take it back
to the “RUN”
position on the
left hand side of
the screen.

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Press the green SET
button until the
indicator on the left
hand side of the screen
is next to “OFF PEAK
PROGRAMME”

The time hour will
now flash for the 1st
on time, this can be
adjusted by pressing
the “MINUS” and
“PLUS” buttons. Once
you are happy with the
hour you have selected
press the “SELECT”
button.

This will then make
the minutes flash,
which can be adjusted
by pressing the
“MINUS” and “PLUS”
buttons as required.
Once you are happy
with the minutes,
press the “SELECT”
button to take you to
the 1st off time

Use the “MINUS” and “PLUS” buttons to adjust
the hour. When you are happy with the hour
selected then press the “SELECT” button which
shall now take you to the minutes. Press the
“MINUS” and “PLUS” buttons to SELECT the
minutes you require and once you are happy
with the minutes press the “SELECT” button.

The hour will be flashing on
the 2nd on time, if this is not
required then press the green
“SET” button which will take
you back to the main screen.
However, if you require any
further off-peak periods then
simply repeat the same steps as
above.

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Default Time Settings

DEFAULT TIMES

1st ON 1st OFF 2nd ON 2nd OFF 3rd ON 3rd OFF
2:15am 7:15am 12:00am 12:00am 12:00am 12:00am

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.

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The Horstmann Electronic 7 Water Heater Controller has been especially developed to control the
immersion heater as economically and conveniently as possible.

During the night, water in the tank will be heated by cheap night-rate electricity, ensuring a tank of
hot water is available for the morning.

Depending on the size of the tank and usage of hot water, this will usually last a day; however, if
required, more hot water can be heated at any time by using the ‘boost’ button which switches on
the immersion heater for one hour.

Alternatively if it is known that extra hot water will be required every day, the ‘boost’ element (in
the tank) can be programmed so that it will heat only a small part of your tank. This is normally
the upper element in the tank and can be programmed to come on once each day at a set time.

Some tariffs offer additional cheaper electricity periods during the day time; the Electronic 7 has
extra off peak switching periods available to accommodate this.

Service and Repair

The Horstmann Electronic 7 is not user serviceable, so please do not try to dismantle the unit.

In the unlikely event of a fault developing try resetting the unit, which is in this manual under
“RESETTING THE UNIT”. If this fails to resolve the problem then please contact your installer or a local
heating engineer or a qualified electrician.

Questions

(Q) There is no display on the screen?

(A) Ensure there is mains supply getting to the unit and that the battery switch on the rear of the
unit is in either the GMT/BST or GMT ONLY position.

(Q) The display has become frozen?

(A) This could be due to local electrical interference. Using the RESET procedure in this manual may
ratify the fault.

(Q) The neon indicator will illuminate but there is no hot water?

(A) Ensure the SWITCHED OUTPUT switch is in the TIMED position. If this still fails to rectify the
problem please contact a local heating engineer or a qualified electrician.

(Q) How do I change the back-up battery?

(A) You can’t as it is an integral part of the unit, and therefore would invalidate your guarantee if
you dismantled the unit.

(Q) I want to adjust my off-peak times, how is this achieved?

(A) Please go to “SETTING OFF PEAK PERIODS” in this manual.

(Q) What does the indicator next to the word “TIMED BOOST” mean?

(A) If there is an indicator next to this word on the right hand side of the screen, then this means
the boost programme is selected. Please see “BOOST PROGRAMME” in this manual.

Programmed Boost

This setting is not recommended for single element installations and is normally only used with
twin or dual immersion heaters.
With the “TIMED BOOST” indicator on the right hand of the screen selected the boost, or upper
element within the tank will heat up at the same time automatically everyday.
This can be turned on and off by pressing the “SELECT” button.

To Set Boost Programme

Battery Reserve

The Electronic 7 is designed to be permanently connected to the mains electricity supply.
This unit has a non-rechargeable long-life battery which will maintain the display and switch time
settings for approximately 2 years with the mains electricity supply disconnected. This should be
sufficient to cover all power interruptions during the life of the unit.

Neon Indicators

There are two neon indicators on this unit, one to indicate when the boost is active and the other
to indicate when the timed off-peak is active. With the “SWITCHED OUTPUT SWITCH” in the “OFF”
position the indicators lights will still illuminate but no electrical switching will take place.

User Operating Instructions

Horstmann Controls Limited

South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP

E-mail: [e-mail]

Web site: www.horstmann.co.uk

Leaflet number NP0083079000 – Issue 1

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Press the green SET button until the
indicator on the left hand side of the
screen is next to “BOOST PROGRAMME”.
The time hour will now flash for the on
time, this can be adjusted by pressing the
“MINUS” and “PLUS” buttons.

Press the “MINUS” and “PLUS” buttons to
SELECT the minutes you require and once
you are happy with the minutes press the
“SELECT” button which will take you back to
the “RUN” position. An indicator should be
shown on the right hand side of the screen
next to “TIMED BOOST”, if there isn’t then
you need to press the “SELECT” button.

Once you are happy with the minutes, press
the “SELECT” button to take you to the off
time. Use the “MINUS” and “PLUS” buttons
to adjust the hour. When you are happy
with the hour selected, press the “SELECT”
button which shall now take you to the
minutes.

Once you are happy with the hour you
have selected, press the “SELECT” button.
This will then make the minutes flash,
which can be adjusted by pressing the
“MINUS” and “PLUS” buttons as required.

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