Horstmann CentaurStat 7 User manual

MOUNTING
The Electronic 7 should be removed from the mounting box by opening the front flap and unscrewing
the 2 captive screws securing the unit to the mounting box. The flap, which is hinged along the
bottom edge may be opened by inserting fingernails simultaneously behind the flap on both sides
and gently levering forward.
CONDUIT BOX MOUNTING
Use either holes marked ‘A’ in Fig.1 to secure to a single gang box, or the two holes marked ‘C’ for a
double gang box. Cable entry is through the cut-out between the 2 fixing holes ‘A’
SPECIFICATION
13A 230V AC 50Hz
Suitable for immersion heaters up to 3kW
Live Parts - enclosed
Dirt protection - normal situation
Moisture protection - ordinary
Shock protection - Class 1
Contacts - Micro-disconnection
Battery Reserve - approximately 2 years total power dis-connection
Size - 170mm x 115mm x 60mm (excluding rocker switch)
ENSURE CORRECT SUMMER OR WINTER
TIME SETTING BY USING THE
SUMMER/WINTER BUTTON
ENSURE WINTER APPEARS
ON THE DISPLAY USING THE
SUMMER/WINTER BUTTON
ENSURE SLIDE SWITCH IS IN
THE MANUAL BOOST
SELECTION POSITION.
REPEAT FOR
REMAINING ON/OFF
PERIODS
USE THE HRS AND MINS
BUTTONS TO SET CORRECT TIME
SETTING THE TIME OF DAY
ENSURE THAT THE AM/PM SETTING ARE CORRECT (THIS COULD EFFECT YOUR OFF-PEAK PROGRAMMING)
SETTING THE OFF-PEAK TIMES
PRESS THE RECESSED SET BUTTON, USING A
PENCIL OR BALL POINT PEN (LOCATED NEXT
TO THE SUMMER/WINTER BUTTON)
USE 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
ENSURE CLOCK IS
DISPLAYED WHEN
COMPLETE
SHOULD YOU NOT REQUIRE ANY FURTHER OFF-PEAK SETTINGS ENSURE THAT THE REMAINING PERIODS ARE
SET AT THE SAME TIME EG; 2 ON 12:00PM - 2 OFF 12:00PM,
3 ON 12:00PM - 3 OFF 12:00PM (THESE ARE THE FACTORY DEFAULT SETTINGS)
ONCE THE CLOCK DISPLAY HAS BEEN RESTORED PLEASE ENSURE THE CORRECT SUMMER/WINTER SETTING IS
ON THE DISPLAY.COMPLETING THE INSTALLATION
To assemble the controller to its mounting box first push the connectors numbered 1 - 5 into the
corresponding numbered terminal as shown in Fig.1
Carefully offer the controller to the box and secure with the fixing screws, ensuring the wiring does
not become damaged.
Switch on the mains supply, put the rocker switch in the TIMED position.
QUESTIONSANDANSWERS
The unit display has become frozen
There is no display on the
programmer
How do I know if the is still under warranty
This could be due to local electrical interference
Using the RESET procedure on page 3, may rectify the fault.
The commissioning switch located on the rear of the unit needs to be set in either
the GMT or GMT/BST position. The Electronic 7 must only be removed from it’s back-
box by a qualified electrician.
The Electronic 7 comes with a 2 year guarantee from the date of manufacture. This
date is located on the rear of the unit, indicated by a month over a year. The
Electronic 7 must only be removed from it’s backbox by a qualified electrician.
The Horstmann Electronic 7is 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.
PAGE 1PAGE 4LEAFLET No P30910
ISSUE 8
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 it’s 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.
We recommend 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.
SURFACE MOUNTING
Use the two holes marked ‘B’ in Fig.1 Cable entry is through the most appropriate cut-out
REMOVE THE APPROPRIATE CABLE ENTRY CUT-OUTS BEFORE FIXING THE BOX, WHERE POSSIBLE DRILL THE
BOX TO PROVIDE A CLOSE FITTING ENTRY FOR CABLES AND HEAT-RESISTANT FLEXIBLE CORDS. TAKE CARE TO
REMOVE SHARP EDGES.
Horstmann Controls Limited
Bristol
BS4 1UP
t:0117 9788 773 - f:0117 9788 701
Email: [email protected]k
Website: www.horstmann.co.uk

CONNECTIONS
Use a three-core cable with a minimum conductor size of 1.0mm
2
for a 2kW heater, or 1.5mm
2
for a
3kW heater to connect the unit to the supply. Connect the incoming wires to the terminal block as
follows;
TERMINAL 1 - LIVE in
TERMINAL 2 - NEUTRAL in
TERMINAL 3 - NEUTRAL(s) outtoimmersionheater(s)
TERMINAL 4 - LIVE out to Boost immersion heater
TERMINAL 5 - LIVE out to Off-Peak immersion heater
Clamp all surface wiring adjacent to the box or use trunking where appropriate. Secure the heat
resistant flexible cords from the immersion heaters using the cable clamp in the box.
SINGLE ELEMENT IMMERSION HEATERS
The 3 core flexible cord should be heat-resistant and rated to 85
o
C.
TERMINAL 4 (Boost live output) should be connected to TERMINAL 5(Off-Peak live output) and to the
immersion heater.
The Neutral connection should go to TERMINAL3 and the Earth connection to the EARTH TERMINALS.
DUAL ELEMENT IMMERSION HEATERS
The elements should be controlled through separate thermostats. In practice the thermostat for the
top short element is usually set
5-10
o
Cless than the thermostat for the long Off-Peak element.
The 3 core flexible cords should be heat-resistant and rated
85
o
C.
TERMINAL 4 (boost live output) should be connected to the short element and TERMINAL 5(Off-Peak
live output) to the long element.
The Neutral connections should go to TERMINAL 3and the Earth connection to the EARTH TERMINALS.
TWIN IMMERSION HEATERS
The thermostat for the top immersion element should be set lower than the thermostat for the
bottom immersion heater.
The 3 core flexible cords should be heat-resistant and rated
85
o
C.TERMINAL 4(boost live output)
should be connected to the top immersion heater and TERMINAL 5(off-peak live output)to the bottom
immersion heater. The two Neutral connections should go to TERMINAL 3and the Earth connections to
the EARTH TERMINALS
COMMISSIONING INSTRUCTIONS
SETTING THE CONTROLLER
A feature of this controller is that it allows the time of day and Off-Peak switching times to be set
before the unit is finally installed and powered up.
COMMISSIONING SWITCH
The commissioning switch which is on the back of the unit must now be set to achieve correct
operation of the controller and battery reserve. The display will remain blank with the switch in the
OFF position.
RESETTING THE ELECTRONIC 7
Before installing the off-peak heating periods it is important to reset the unit, this is achieved by
simultaneously pressing the Boost, Summer/Winter, HrsandMins buttons together. The Boost
selection switch must be in the Manual Boost Position.
Electronic equipment can sometimes be affected by sudden changes of atmosphere, this can result in
Display being fogged or Reset function failure. If this happens leave the unit switched on for 15
minutes and repeat the RESET function.
BOOST
SUMMER/
WINTERHRSMINSMANUAL BOOST
TIMED BOOST
BOOST SELECTION
SWITCHPOSITION - GMT or GMT/BST
It is essential that the correct commissioning switch position is selected. Incorrect setting of the
commissioning switch may result in inefficient use of the available Off-Peak supply.
GMT ONLY- Switching will always take place at GMTtimes (summer and winter).
GMT/BST- Switching time will be changed by one hour, when the user presses
SUMMER/WINTERbutton on the face of the unit. In the GMT/BSTmode the clock display will match
the actual switching time.
If connection is to be made where a 2-Rate electricity meter is controlled by a Radio Teleswitch or
other equipment, which control tariffs remotely or seasonally, it is essential that before setting the
commissioning switch you find out how the off-peak times are controlled.
The Customer Service Centre of your Electricity Supplier will confirm information regarding Off-Peak
electricity timing and the switching method used for your area. (see below)
GMT ONLY- Set the switch in the GMT position, switching will always take place at GMT
times (summer and winter).
GMT/BST- Set the commissioning switch in the GMT/BST position. Switching time will be
changed by one hour, when the user presses SUMMER/WINTERbutton on the face of the unit. In the
GMT/BSTmode the clock display will match the actual switching time.
On installations where the 2-Rate electricity meter is controlled by a mechanical Tariff Timeswitch the
commissioning switch should be set to GMT ONLY.
PAGE 2PAGE 3
When wiring is complete ensure that all terminal screws,
including the earth terminal screws are securely tightened
to achieve a minimum torque of .75Nm.