Horstmann CentaurStat 7 User manual

USERS INSTRUCTIONS
The Horstmann Electronic 7 Water Heater Controller has been specially developed to give you
all the Hot water you want as cheaply and as conveniently as possible.
During the night, the water in your tank will be heated by cheap night-rate electricity, so that
you have a tank of hot water available for the morning.
Depending on the size of your tank and usage of hot water, this will usually last a day; you
can obtain more Hot water at any time by using the Boost button, to switch on the immer-
sion heater to suit your requirements. Alternatively, if you know you will require extra Hot
water every day, you can programme the boost to come on each day at a set time
KNOW YOUR PROGRAMMER
BATTERY RESERVE
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 expected power interruption expected during the life of the unit.
SERVICE AND REPAIR
The HORSTMANN ELECTRONIC 7 is NOT USER SERVICEABLE
DO NOT TRY TO DISMANTLE THE UNIT
In the unlikely event of a fault developing please try RESETTING the unit,located on page 2 of this User
guide, if this fails to resolve the problem please contact a local Heating Engineer or Qualified Electrician.
WATER HEATER CONTROLLER
FOR ECONOMY 7
AND WHITE METER TARIFFS
Off peak
Indicator
Water
Heater
Switch
TIMED BOOST SETTING
OFF TIME
ON TIME
There is no display on the Programmer
The unit display has become frozen
The indicator neon will illuminate but
there is no hot water
How do I know if the programmer is
still under warrantee
The Off-Peak/Boost neon is ON
constantly
How can the Off-Peak Heating times be
altered.
The Off-peak heating period is
occurring during the day.
Ensure that there is mains supply and the battery switch on the rear of the unit
must be in either the GMT/BST or GMT ONLY position.
This could be due to local electrical interference. Using the RESET
procedure located on page 2 of this User guide may rectify the fault.
Ensure that the Water Heater Switch on the front of the Electronic 7 is in the Timed
position. If this fails to rectify the problem please contact a local heating engineer
or qualified electrician.
The Electronic 7 comes with a 2 year guarantee from the date of
manufacture. This date is located on the inside of the unit, indicated by a month
over a year.
There could be a possible problem with the Electronic 7 or the immersion
elements, please contact a qualified electrician or heating engineer.
Please refer to the Off-Peak Heating Programming section on page 2 of this User
Guide.
Please check the AM/PM settings on the current time and the Off-Peak Heating
times.
LEAFLET No P30909
ISSUE 7
PAGE 4PAGE 1
With the Water Heater switch in the Timed position the Off-Peak indicator will glow whenever the
Electronic 7 is supplying electricity to the immersion heater during the cheap-rate period.
Similarly the Boost On indicator will glow whenever the Boost is in operation.
With the Water Heater switch in the OFF position the indicator lights will still illuminate, However
there will no heating of the immersion elements. This is normal operation of the Electonic 7.
INDICATORS
BOOST
SUMMER/
WINTERHRSMINSMANUAL BOOST
TIMED BOOST
BOOST SELECTION
BUTTONS SITUATED BEHIND FLIP-DOWN COVER BOOST SELECTION SLIDE SWITCH
Boost
Button
Boost
Indicator
Set Button
Horstmann Controls Limited
Bristol
BS4 1UP
Email: [email protected]k
Website: www.horstmann.co.uk

ENSURE SLIDE SWITCH IS IN THE MANUAL
BOOST POSITION.USE THE HRS AND MINS
BUTTONS TO SET CORRECT TIME
SETTING THE TIME OF DAY
SUMMER / WINTER BUTTON
BOOST SELECTION
SETTING OFF-PEAK HEATING PERIODS
Your Installer would have already set the off-peak heating time, however if you require extra hot water
on a daily basis you can set one of the remaining programmable heating times. Please follow the
instructions below.
ENSURE WINTER
APPEARS ON THE DISPLAYUSE THE HRS AND MINS
BUTTONS TO SET REQUIRED
1 ON TIME
PRESS THE SET
BUTTON AGAIN,USE THE HRS AND MINS
BUTTONS TO SET REQUIRED
1 OFF TIME
REPEAT FOR ALL
REMAINING ON/OFF
PERIODS
ENSURE CLOCK IS
DISPLAYED WHEN
COMPLETE
LOWER THE FRONT FLAP OF THE
UNITPLACE SLIDE SWITCH IN TO THE
ON TIME POSITIONUSE HRS AND MINS
BUTTONS TO SET ON TIME
PLACE SLIDE SWITCH IN TO THE
OFF TIME
POSITION
USE HRS AND MINS
BUTTONS TO SET OFF TIMEPLACE SLIDE SWITCH IN TO THE TIMED BOOST POSITION
THE BOOST WILL NOT OPERATE OR WILL BE
CANCELLED DURING OFF-PEAK HEATING PERIODS.
OFF-PEAK SWITCHING TIMES
Your installer will have set the Off-Peak switching times to make the best use of the Tariffs available.
These switching times should need no further adjustment.
RESETTING THE UNIT
Sometimes electronic equipment can become scrambled or frozen. To overcome this you should reset
the unit by pressing the BOOST, SUMMER/WINTER, HRS and MINS buttons simultaneously. The unit will
now revert to pre-set factory default Off-Peak times and the current time will display 12:00pm
WATER HEATER SWITCH
In theWATER HEATER OFFposition the indicator lights, display and clock will operate, and maintain the
programme, even though the supply to the heater is disconnected.
In the TIMEDposition the over-night immersion heater will be switched ONand OFFat the programmed
switch-time settings, at other times the boost facility is available.
When the TIMED Boost is no longer required the boost selection
switch should be moved to the MANUALBoost position.
BOOSTSUMMER/
WINTERHRSMINS
ENSURE CORRECT SUMMER OR WINTER
TIME SETTING BY USING THE
SUMMER/WINTER BUTTON
PRESS THE RECESSED SET BUTTON, USING A
PENCIL OR BALL POINT PEN (LOCATED NEXT
TO THE SUMMER/WINTER BUTTON)
PAGE 3
PAGE 2
The Electronic 7 has both a Manual and Timed Boost facility.
MANUAL BOOST
Set the Boost selector switch to MANUAL Boost
position. When the Boost button is pressed the
Boost immersion Heater is switched ON under
TIMED BOOST
This setting is not recommended for single element installations and is normally only used
with twin or dual immersion heaters.
In the TIMED Boost position the Boost immersion heater will be switched ON and OFF
automatically at the same time each day.
This controls the time on the
display and should be used to
alter the time by one hour
during
BST (Summer)
and GMT (Winter).
1st ON 1st OFF2nd ON2nd OFF3rd ON3rd OFF
2:15
AM7:15AM12:00PM12:00PM12:00PM12:00PM
DEFAULT TIME SETTINGS
After a RESET the Off-Peak heating times will revert back to the default factory settings, these are
shown above, however if you wish to change these proceed as instructed in the SETTING THE OFF-PEAK
HEATING PERIODS opposite .
SUMMER/
WINTER
TIMED BOOST SETTING
OFF TIME
ON TIMEMANUAL BOOST TIMED BOOST
BOOST SELECTION
TIMED BOOST SETTING
OFF TIME
ON TIMEMANUAL BOOST
TIMED BOOST
BOOST SELECTION
the control of its thermostats, for a period of one hour.
To cancel, press the Boost again and release.