CentaurPlus C17-ZW and HRT4-ZW
User Operating Instructions
Combined Timeswitch and Room Thermostat
The Horstmann CentaurPlus ZW combined wireless room stat and time control allows
a combi boiler system to have a room thermostat added without the need for any
additional wiring.
Replacing the existing time controller 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.
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General system - explanation for householder
The CentaurPlus ZW is a timeswitch which is connected to its own room thermostat - the
HRT4-ZW - using the latest Z-wave wireless technology.
Where it has been used to replace your existing time control it is likely that there was no
room thermostat fitted previously.
The addition of this room thermostat will make considerable energy savings which
independent tests have shown could be as much as 10% off your energy bills.
The thermostat uses the latest micro-processor controlled energy saving software – known
as TPI - which is a very accurate temperature control method compared to older style
mechanical room thermostats. It runs on two AAA batteries which should last more than
2 years and a battery low indicator will appear in the display of the thermostat when
they need changing.
The CentaurPlus ZW timeswitch is mains powered with a reserve battery to retain its
memory during power cuts. It will allow up to 3 On/Off settings per day for each day of
the week and has a 1 hour boost button and an On/Off advance button.
There is also a programme override allowing the permanent selection of OFF/ON/AUTO/
ALL DAY.
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The room thermostat will only operate during ‘On’ periods set by the time control which
is always indicated by the red neon indicator light on the front. If there is no light then
the heating is ‘Off’ and the room thermostat is inoperative.
When the timeswitch is ‘On’ (shown by the red
indicator light) the thermostat will be operational
and will provide very accurate control of the room
Indicator
light
temperature.
When the thermostat is ‘calling’ for heat the flame
symbol will appear in the thermostat display and if the
timeswitch is ‘On’ the heating will be operative and
will run under the control of the timeswitch and the
temperature set on the room thermostat.
The thermostat is silent in operation – it does not ‘click’ on and off like older style
thermostats. The contacts on the timeswitch will do the actual switching rather than the
thermostat which is linked to it by Z wave wireless signals.
The indicator against the radio mast symbol on the
CentaurPlus ZW shows that the radio link is established.
A flashing indicator means that the wireless connection
has been temporarily lost. This is usually restored by
going to the thermostat and turning the dial up and
down.
If no indicator is present next to the radio mast symbol
then this would suggest that the CentaurPlus ZW
and the HRT4-ZW thermostat have not been paired
correctly on installation. (See pairing instructions in the
Installation Guide).
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What is a programmer?
... an explantion for householders.
Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central
heating and domestic hot water on and off at the same time; while others allow the
domestic hot water and heating to come on and go off at different times.
Set the ‘On’ and ‘Off’ time periods to suit your own lifestyle. On some programmers you
must also set whether you want the heating and hot water to run continuously, run under
the chosen ‘On’ and ‘Off’ heating periods, or be permanently off.
The time on the programmer must be correct. Some types have to be adjusted in Spring
and Autumn at the changes between Greenwich Mean Time and British Summer Time.
You may be able to temporarily adjust the heating programme, for example, ‘Override’,
‘Advance’ or ‘Boost’. These are explained in the manufacturer’s instructions.
The heating will not work if the room thermostat has switched the heating off. And, if
you have a hot-water cylinder, the water heating will not work if the cylinder thermostat
detects that the hot water has reached the correct temperature.
The above explanation also applies to your timeswitch, which operates as a single
circuit programmer.
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