CentaurPlus ZW and HRT4-ZW
Installation Instructions
Combined Time Control and Room Thermostat
The Horstmann CentaurPlus ZW combined wireless room stat and timeswitch allows
a combi boiler system to have a room thermostat added without the need for any
additional wiring.
Replacing the existing timeswitch with the CentaurPlus ZW will allow the room thermostat
to be connected wirelessly producing immediate energy savings in houses where no
previous room thermostat has been fitted.
The device is intended to upgrade existing combi boiler systems that do not have
an existing room thermostat. It is not intended for new installations where it will
be necessary to install two heating zones in order to comply with current Building
Regulations.
1
For the installer
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.
An example circuit diagram for a typical combi boiler installation is shown below. This
diagram is schematic and should be used for guidance only.
ROOM
STAT
Wireless link
CentaurPlus ZW
N
L 1 2 3 4
TERMINALS L-2
SHOULD NOT
BE LINKED
MAINS
SUPPLY
N
L
For precise terminal
connection information
please refer to boiler
manufacturer's instructions
N
E
2
L
COMBINATION BOILER TERMINALS
BOILER LIVE OUT
REMOVE LINK
IF REQUIRED
SWITCHED LIVE
RETURN TO BOILER
E
Fitting the backplate
Once the backplate has been removed from the packaging please ensure the timeswitch
is re-sealed to prevent damage from dust, debris.
The backplate should be fitted with the wiring terminals located at the top and in a
position that allows a total clearance of at least 50mm around the unit.
Direct wall mounting
Offer the backplate to the wall in the position where the timeswitch is to be mounted,
remembering that the backplate fits to the left hand end of the control. Mark the fixing
positions through the slots on the backplate (fixing centres of 60.3mm), drill and plug the
wall, then secure the plate in position. The slots in the backplate will compensate for any
misalignments of the fixings.
Wiring box mounting
The backplate may be fitted directly onto a single gang steel flush wiring box complying
with BS4662, using two M3.5 screws. CentaurPlus controls are suitable for mounting on
a flat surface only; they must not be positioned on a surface mounted wall box or on
unearthed metal surfaces.
3
Electrical Connections
All necessary electrical connections should now be made. Flush wiring can enter from the
rear through the aperture in the backplate. Surface wiring can only enter from beneath
the timeswitch and must be securely clamped. The mains supply terminals are intended
to be connected to the supply by means of fixed wiring. Recommended cable sizes are
1.00 or 1.5mm.
CentaurPlus timers are double insulted and do not require an earth connection but an
earth connection is provided on the backplate for terminating and cable earth connectors.
Earth continuity must be maintained and all bare earth connectors must be sleeved.
Ensure no earth conductors are left protruding outside the central space enclosed by the
backplate.
Internal diagram - C17-ZW
The CentaurPlus ZW has voltage free contacts.
A link L-2 is required for
mains voltage applications
N L 1 2 3 4
230V 50V COMM OFF ON
Rear view of CentaurPlus timeswitch
1 - RATINGS LABEL
3
1
PULL TO REMOVE
2
4
2 - BATTERY
3 - CONNECTOR PINS
4 - PRODUCTION DATE LABEL
+
Battery reserve
The battery must be commissioned prior to fitting the timeswitch to the backplate. This is
achieved by the means of a commissioning strip situated in the back of the unit. Pull out
the battery commissioning strip at the back of the timeswitch and re-insert the battery;
the reserve is now activated. When the timeswitch is running the battery reserve clock
display will disappear. This is to prolong the life of the battery.
4
Fitting the timeswitch
End view of CentaurPlus timer
If surface wiring has been used, remove the knockout/insert from the bottom of the
timeswitch to accommodate it.
Loosen the two ‘captive’ retaining screws on the bottom of the backplate. Now fit the
timeswitch to the backplate, ensuring the lugs on the backplate engage with the switch.
Swing the bottom of the timeswitch into position ensuring that the connection pins on the
back of the unit locate into the terminal slots in the backplate.
Tighten the two captive retaining screws to fix the unit securely.
Then switch on the mains supply.
On completion of the installation please reset the timeswitch as detailed next;
Resetting the timeswitch
On the CentaurPlus press the SET and SELECT buttons together. Then release the
buttons and the timer will return to preset factory settings
The preset factory settings are illustrated on page 10 of the USER GUIDE.
SELECT
SET
The unit is now ready to be signed on to its HRT4-ZW room thermostat,
to suit the user’s requirements
5
General Information
BATTERY
The timeswitch is fitted with a non-rechargeable, long life battery, which will maintain the
programmed time settings for a minimum of ten months with the supply disconnected.
THIS SHOULD BE SUFFICIENT TO COVER POWER INTERRUPTIONS DURING THE LIFE OF THE UNIT.
During power interruptions the display will be blank, after 3 days the current time of day
will be lost. These measures are to prolong the battery life.
SERVICE AND REPAIR
This timeswitch is NOT user serviceable. Please do not dismantle the unit.
In the unlikely event of a fault developing please refer to the RESETTING THE TIMESWITCH
section of this user guide shown above. If this fails to resolve the problem please contact
your installer, a local heating engineer or a qualified electrician.
6
HRT4-ZW room thermostat
Installation and pairing instructions
The HRT4-ZW is a wireless electronic battery powered room thermostat that uses
interoperable two-way RF mesh networking technology to provide optimum
comfort with close control of the energy used to heat the home without the need
for additional wiring or unsightly cable runs.
The HRT4-ZW will only operate when 2 x AAA batteries have been fitted and the
thermostat is installed and communicating with the CentaurPlus ZW timer/receiver unit.
INSTALLATION AND CONNECTION OF THE HRT4-ZW SHOULD ONLY BE CARRIED OUT BY A
SUITABLY QUALIFIED PERSON.
7
Instructions for pairing the HRT4-ZW room thermostat
with the CentaurPlus ZW.
These devices use the latest Z-Wave wireless communication technology to give a reliable wireless
link that should not suffer from interference from other nearby devices. The device comprises a
thermostat (the HRT4-ZW) and its receiver (the CentaurPlus C17-ZW). Pairing the devices on site
ensures reliable communication.
Follow these steps to ensure that the HRT4-ZW thermostat will communicate satisfactorily
with its receiver. This is best carried out with the HRT4-ZW thermostat held nearby the
(powered) CentaurPlus C17-ZW.
Stage 1
1) Set the number 1 DIL switch on the back of the HRT4-ZW thermostat
to the On (Up) position and the display will change to show the letter ‘I’.
If the letter ‘L’ appears, carry out stage 1A opposite.
2) Power up the CentaurPlus ZW timeswitch.
3) Press the dial on the front of the HRT4-ZW thermostat once so
that the ‘I’ in the display flashes.
4) Press and hold the ‘Boost’ and ‘Enter’ buttons on the front of the
CentaurPlus ZW until an indicator appears in its display against the
radio aerial symbol.
5) After a few seconds the radio mast symbol
will appear in the display along with the letters IP.
6) Reset the number 1 DIL switch on the back of the HRT4-ZW
to the Off position and the temperature will appear in the display.
7) Now check the CentaurPlus ZW time control is receiving signals from the thermostat by
turning the time switch to an ‘On’ setting with the red indicator light lit and turning the
thermostat up and down to make the boiler switch on and off.
N.B. There is a half second delay in switching On and Off on receipt of the commands. There
is no ‘click’ from the thermostat which is silent in operation but there will be an audible ‘click’
from the CentaurPlus ZW when it is ‘On’ and the thermostat switches On and Off.
8) When the thermostat is calling for heat a flame symbol will appear in its display.
9) Z Wave communication is now successfully established.
8
Press and hold ‘BOOST’ and ‘ENTER’
buttons to ‘SIGN ON’ or ‘PAIR’ the
HRT4 ZW thermostat
Stage 1A – Only used if ‘L’ is displayed instead of ‘I’
1) Turn the dial of the HRT4-ZW until the letter P appears in the display.
2) Press the dial twice and PP should appear in the display.
3) Turn the dial until the letter ‘I’ appears in the display and return to the main instruction.
Under normal circumstances the HRT4-ZW thermostat and CentaurPlus
C17 ZW will be ‘paired’ easily by following the procedure shown under Stage
1 of the pairing instructions
Only use Stage 2 if a radio link cannot be successfully established between
the two devices.
Stage 2 – Only used if the above procedure does not establish a
successful communication link
1) Turn the dial of the HRT4-ZW until the letter P appears in the display.
2) Press the dial twice and PP should appear in the display.
3) Now turn the dial until letter E appears in the display.
4) Press the dial once and the display should flash ‘E’.
5) Press and hold the ‘Boost’ and ‘Enter’ buttons on the CentaurPlus ZW.
6) Turn the thermostat dial until ‘I’ appears in the display and return to the main instruction.
Press and hold ‘BOOST’ and ‘ENTER’ buttons to ‘SIGN ON’ or ‘PAIR’
the HRT4 ZW thermostat
9
Fitting the HRT4-ZW Room Thermostat
Before final installation it is advisable to commission the product and ensure that the
Thermostat and Receiver are communicating satisfactorily. First install the 2 type AAA
batteries provided making sure that they are fitted correctly as indicated by the markings
in the battery compartment.
Once the thermostat and receiver
are successfully ‘paired’ the
thermostat can be installed in its
correct location. Please see Z-Wave
pairing instructions on page 8.
Avoid installing the thermostat against or behind any large metal surfaces which could
interfere with the radio signals to and from the CentaurPlus timer with combined receiver.
The HRT4-ZW should be mounted on an internal wall approximately 1.5 metres from floor
level using the wall plate provided and should be in a position away from draughts, direct
heat and sunlight. Ensure that there will be enough space to allow easy access to the two
retaining screws located at the base of the wall plate.
Before fixing the wall plate in position check to see that the thermostat and boiler are still
able to communicate satisfactorily by turning the thermostat temperature up and down to
switch the boiler on and off.
Offer the plate to the wall in the position where the CentaurPlus ZW is to be mounted
and mark the fixing positions through the slots in the wall plate. Drill and plug the wall,
then secure the plate into position. The slots in the wall plate will compensate for any
misalignment of the fixings.
Complete the installation by swinging the room thermostat
into position by engaging with the lugs at the top of the
wall plate before pushing it carefully home into its plugin terminal block. Tighten the 2 captive screws on the
underside of the unit.
Now ensure that the heating system is responding to the
ON/OFF commands from the Room Thermostat and explain
its operation to the householder before
handing over the User Instructions.
10
Timeswitch specification CentaurPlus ZW
Contact Rating 3 (1) Amps 230V AC
Contact Type Micro-disconnection changeover
Voltage free
Supply 230V AC 50Hz only
Pollution Degree 2
Class A Software Type 1 Control
Operating Temperature Range 0°C to +40°C
Battery Life 10 months continuous operation (minimum)
Case Material Thermoplastic, flame retardant
Dimensions 84mm x 150mm x 29mm
Display Back lit liquid crystal
Clock 12 hour AM/PM
Auto BST/GMT changeover
Displayed Time adjustments 1 minute steps
Switched Time adjustments
Operating periods per day - 3 per day(Separate programmes possible for each day of the week)
10 minute steps
Override 1 hour boost, 1 hour extension to On period, instant advance
Mounting Industry standard 6 terminal plug in wall plate
Transmitter Frequency 868MHz
Design Standard EN60730-2-7
IP30
EN300-220 R & TTE Directive
EN301-489
Thermostat specification HRT4-ZW
Power supply 2 x AAA alkaline batteries
Temperature accuracy +/- 0.5°C
Transmitter frequency 868MHz
Dimensions 86mm x 86mm x36.25mm
Pollution control Degree2
Design standard EN60730 - 2-9
Temperature range 5°C – 30°C
Enclosure protection IP30
Operating temperature range 0-40°C
Case material Thermoplastic, flame retardant
For further replacement timeswitch exchange information,
please see the ‘Programmer Wiring and Replacement Guide’ at www.horstmann.co.uk
Use the categories shown under CentaurPlus C11 and C17.
11
Horstmann Controls
South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP
E-mail: sales@horstmann.co.uk
Web site: www.horstmann.co.uk
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Leaflet number P84372 – Issue 1
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