Horstmann C-Stat ZW Installation Guide
C-Stat 11-ZW | C-Stat 17-ZW
Installation Instructions
Room Thermostat and ASR-ZW Receiver
Wireless Programmable
Programmable room thermostats are widely recognised as one
of the best ways in which to control central heating. Horstmann
C-Stat programmable room thermostats have a large display
and intuitive user interface, making them easy to set up and use.
C-Stat uses a sophisticated time proportional integral (TPI)
algorithm for accurate temperature control and energy
efficiency. The C-Stat ZW is a wireless electronic battery
powe re d pr og rammabl e ro om the rmostat tha t us es
interoperable two-way RF mesh networking technology which
avoids the need for additional wiring or unsightly cable runs.
Installation and connection should only be carried out by a
suitable qualified person and in accordance with the current
edition of the IEE wiring regulations.
Warning: Isolate mains supply before commencing installation.
1
Installing the ASR-ZW receiver
The ASR-ZW receiver should be located as near as is
practical to the boiler or zone valve to be controlled, as
well as a convenient mains electricity supply. To remove
the wall plate from the ASR-ZW undo the two retaining
screws located in the underside, the wall plate should
now be easily removed. Once the wall plate has been
removed from the packaging please ensure the ASRZW is resealed to prevent damage from dust, debris etc.
The wall plate should be fitted with the retaining screws
located at the bottom and in a position which allows a
total clearance of at least 50mm around the ASR-ZW
receiver.
Direct Wall Mounting
Offer the plate to the wall in position where the ASR-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.
Wall Box Mounting
The wall plate may be fitted directly on to a single gang
flush wiring box complying with BS4662, using two M3.5
screws. The receiver is suitable for mounting on a flat
surface only; it is not suitable for mounting on an
unearthed metal surface.
2
Electrical Connections
WARNING: ISOLATE THE MAINS SUPPLY BEFORE
COMMENCING INSTALLATION
As the C-Stat is a wireless product with no electrical connections
all electrical wiring will be made to the ASR-ZW receiver.
All necessary electrical connections should now be made. Flush
wiring can enter from the rear through the aperture in the
backplate.
The mains supply terminals are intended to be connected to the
supply by means of fixed wiring.
The receiver is mains powered and requires a 3 Amp fused spur.
The recommended cable size is 1.0mm².
The receiver is double insulated and does not require an earth
connection, an earth connection block is provided on the
backplate for terminating any cable earth conductors. Earth
continuity must be maintained and all bare earth conductors
must be sleeved. Ensure that no conductors are left protruding
outside the central space enclosed by the backplate.
ASR-ZW Receiver internal wiring diagram
Internal
Electronics
1 2 3 4LN
230V 50Hz COMM OFF ON
The receiver has Voltage Free contacts. A link between Live and
terminal 2 is required for mains Voltage applications.
3
Example circuit diagrams for typical boiler installations are
shown below. These diagrams are schematic and should be
used for guidance only.
Please ensure that all installations comply with the current IEE
regulations and the boil er manufactu rer 's installat ion
instructions.
For reasons of space and clarity not every connection has been
included and the diagrams have been simplified, for instance
some earth connections have been omitted.
Cylinder and Room Thermostat Key:
C= Common CALL= Call for heat or break on rise
SAT= Satisfied on rise N= Neutral
ASR Receiver
3
1 2
L
Mains
N
Supply
E
E
L
N
COMBINATION BOILER
TERMINALS
C-Stat ASR Receiver controlling typical combination boiler installation.
For precise termination connection information please refer to the boiler manufactures
instructions
4
4
Remove link
if Fitted
Programmer
HOT
CENTRAL
WATER
HEATING
OFF
ON
N L
N
MAINS
L
SUPPLY
E
C-Stat ASR Receiver controlling a secondary heating zone on a fully pumped system
with existing programmer and two spring return valves with auxiliary switches
C CN
CALL
SAT
OFF
ON
ASR Receiver
MAINS
SUPPLY
N
L
E
1 2 3 4
PUMP
N
&
BOILER
L
ROOM
CYL
STAT
STAT
CALL
SAT
Programmer
HOT
CENTRAL
WATER
HEATING
OFF
CYL
STAT
CALLSAT
OFF
ON
ASR Receiver
2
3
4
SAT
L
N
PUMP
&
BOILER
ON
N L
N
MAINS
L
SUPPLY
E
W
BL
0
GR
C-Stat ASR Receiver replacing a conventional room thermostat on a fully pumped
system with an existing programmer and 3 port mid-position valve.
C
CALL
5
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