SRT322
User and Installation Instructions
Battery Powered Wireless Digital Electronic Room
Thermostat with receiver
The SRT322 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 SRT322 will only operate when 2 x AAA batteries have been fitted and the
thermostat is installed and communicating with the ASR-ZW receiver unit.
INSTALLATION AND CONNECTION OF THE SRT322 SHOULD ONLY BE
CARRIED OUT BY A SUITABLY QUALIFIED PERSON.
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User Instructions
The Secure SRT322 thermostat uses the latest control technology to provide extremely
accurate temperature control which will help to keep your energy usage as low as possible
without affecting your comfort levels. In fact comfort levels may well be improved as the
control accuracy should ensure that the room does not ‘overheat’ before switching off.
The display will show the required temperature setting and
can be adjusted in increments of 1°C.
To adjust the required temperature setting turn the dial anti
clockwise to decrease it and clockwise to increase it.
Pressing the temperature setting dial will allow the user to check the current
actual measured room temperature which will be displayed for approx 7
seconds before returning to the set temperature.
When the thermostat is in the ‘call for heat’ condition a flame symbol will appear
in the display.
The aerial symbol complete with radio wave symbols in the display of the
SRT322 thermostat indicates that it is communicating satisfactorily with the
receiver.
A flashing radio wave indicates a loss of communication. This may be
temporary and can often be restored by turning the thermostat dial and
increasing or decreasing the temperature to make the thermostat switch. If this
has no effect please see Z-Wave pairing instructions on page 10.
A radio mast symbol with no radio waves indicates that the SRT322 has not
been signed on to enable it to communicate with the receiver. In this case you
may wish to contact the Installer as the indication is that the product has not
been commissioned when the installation took place. Alternatively see the ZWave pairing instructions on page 10.
Battery replacement
The SRT322 runs on 2 x type AAA (Alkaline) non rechargeable batteries and is designed
to give a battery life of approximately two years.
When the batteries are nearing the end of their life a
low battery symbol will appear in the display and the
batteries should be changed within a few days. If the
batteries are not changed at this point eventually a
‘LO’ battery message flashes intermittently in the
display and if this happens the batteries should be
changed immediately.
To change the batteries it is necessary to remove the thermostat from the wall. To do this
first undo the two captive screws at the base of the thermostat and swing the thermostat
up and away from the wall plate.
Remove the old batteries and replace them with two new AAA
size alkaline batteries ensuring that they are fitted correctly as
indicated by the terminal markings in the battery compartments.
Once the batteries are fitted, re-fit the thermostat to the wall plate
by engaging with the lugs at the top of the wall plate and push the
thermostat into position. Locate it over the captive screws at the
base of the wall plate and tighten so that the thermostat is locked
into position.
Check the temperature setting is correct and adjust if necessary.
Please dispose off the batteries responsibly.
Receiver unit
The receiver unit receives the Z-Wave radio signals from the
SRT322 room thermostat. In the unlikely event of a
communication failure it is possible to override the system and
switch On and Off using the On/Off buttons on the receiver as a
local override.
If the override is used to override the SRT322 thermostat when
it is functioning correctly then the override will be cancelled by
the next switching operation of the thermostat and normal
operation will be resumed. In any case, with no further
intervention, normal operation will be restored within one hour
of the override being operated.
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Batteries should be
changed immediately
Low battery symbol
appears first when the
batteries are nearing the
end of their life
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Installation Instructions
Installing the Receiver
The 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
receiver, undo the two retaining screws located on the
underside, the wall plate should now be easily removed. Once
the wall plate has been removed from the packaging please
ensure the receiver is re-sealed 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 receiver.
Direct Wall Mounting
Offer the plate to the wall in the position where the receiver 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.
Electrical Connections
WARNING: ISOLATE THE MAINS SUPPLY BEFORE COMMENCING INSTALLATION
As the SRT322 is a wireless product with no electrical connections all electrical wiring will
be made to the 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.Omm2.
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.
Two example circuit diagrams for typical boiler installations are shown opposite. These
diagrams are schematic and should be used for guidance only. Please ensure that all
installations comply with the current IEE regulations and the boiler manufacturer’s
installation 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.
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Receiver internal wiring diagram
The receiver has voltage Free contacts. A link between
Live and terminal 2 is required for mains Voltage
applications.
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Typical combi boiler system
with built in timer
This diagram shows a typical receiver and
combination boiler installation, where the
external boiler control is connected via switching
terminals (a link may have to be removed on the
boiler switching control terminals). Mains
supplies to both the receiver and the boiler are
omitted for clarity. Please consult the boiler
manufacturers installation handbook before
commencing any installation work.
N = Neutral
L = Live
S = Boiler switch output
R = Boiler switch return
Zone/Heating control basic
layout
This diagram shows a receiver used in a
conventional fully pumped system using a 2 port
spring return zone valve with auxiliary switch to
control the pump and boiler. Please note: hot water
control will need to be controlled by the use of a
programmer or time switch.
Mains supplies to both the receiver
and the boiler are omitted for
clarity. Please consult the boiler
manufacturers.
installation handbook
before commencing any
installation work.
To Pump
and Boiler
2 Port spring return
motorised valve with
auxiliary end switch
Switch live from
programmer or mains
feed from wiring
centre (fused 3 Amp)
Fitting the SRT322 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 x 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 10.
Avoid installing the thermostat against or behind any large metal surfaces which could
interfere with the radio signals to and from the receiver. The SRT322 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 Receiver are still able to
communicate satisfactorily by turning the thermostat
temperature up and down to switch the receiver on
and off.
Offer the plate to the wall in the position where the
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 carefullyinto
its plug-in 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 these User Instructions.
receiver
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DIL switch settings – TPI temperature control software
Thermostats using TPI (Time Proportional Integral) control algorithms will reduce the
temperature swing that normally occurs when using traditional bellows or thermally
operated thermostats.
As a consequence, a TPI regulating thermostat will maintain the comfort level far more
efficiently than any traditional thermostat.
When used with a condensing boiler, the TPI thermostat will help to save energy as the
control algorithm allows the boiler to operate in condensing mode more consistently
compared to older types of thermostat.
Ÿ DIL switch numbers 7 and 8 should be set as diagram
opposite.
Ÿ For Gas boilers set the TPI setting to 6 cycles per hour.
(Default setting)
Ÿ For Oil boilers set the TPI setting to 3 cycles per hour.
Ÿ For Electric heating set the TPI setting to 12 cycles per
hour.
ON
OFF
1 INSTALLER MODE
2 NOT USED
3 NOT USED
4 NOT USED
5 NOT USED
6 NOT USED
TPI
3
TPI
6
TPI
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SWITCH CONFIGURATION SRT322
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Switch positions for
different TPI settings.
lnstructions for pairing the SRT322 room thermostat
with the receiver
The SRT322 uses 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 of a thermostat and its receiver unit. Pairing the devices on site ensures
reliable communication.
Follow these steps to ensure that the SRT322 thermostat will communicate
satisfactorily with it’s receiver, this is best carried out with the SRT322 Thermostat
held nearby the (powered) receiver.
Stage 1
1) Set the number 1 DIL switch on the back of the SRT322
thermostat to the On (Up) position and the display on
the SRT322 will change to show the letter ‘I’. If the letter
‘L’ appears, carry out stage 1A opposite.
2) Power up the receiver unit.
3) The network LED on the receiver should be
flashing.
4) Press the dial on the front of the SRT322
thermostat once so that the ‘I’ in the display flashes.
5) Press and hold the network button on the receiver
until the On indicator flashes (green) before the Off
indicator becomes solid red.
6) After a few seconds the radio mast symbol will
appear in the display along with the letters IP.
7) Reset the number 1 DIL switch on the back of the
SRT322 to the Off position and the temperature
should return in the display.
8) Now check the receiver responds to the thermostat on and off commands by
increasing and decreasing the temperature settings until it switches accordingly.
N.B. There is a half second delay in switching On and Off on receipt of the command.
9) The Z-Wave communication link is now successfully established.
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ON
OFF
1 INSTALLER MODE
2 NOT USED
3 NOT USED
4 NOT USED
5 NOT USED
6 NOT USED
TPI
3
TPI
6
TPI
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SWITCH CONFIGURATION SRT322
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Network LED Network button
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Under normal circumstances the SRT322 thermostat and receiver 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 1A – Only used if ‘L’ is displayed instead of ‘I’
1) Turn the dial of the SRT322 until the letter P appears in the display.
2) Press the dial twice.
3) A second P should appear in the display which now shows `PP’.
4) Turn the dial until the letter ‘I’ appears in the display and return to the main
instruction.
Stage 2 – Only used if the above procedure does not establish
a successful communication link
1) Turn the dial 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.
5) Press and hold the network button on the receiver until it starts to flash.
6) Turn the dial until the letter `I’ appears in the display and return to the main
instruction.
Thermostat specifications
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
Rated Impulse voltage Cat 1 – 1500v
Enclosure protection IP30
Operating temperature range 0-40 °C
Double Insulated
Case material Thermoplastic, flame retardant
Receiver specification
Power Supply 230V AC 50Hz
Contact type Micro disconnection
Voltage free
Contact rating 3 (1) Amps 230v AC
Operating temperature range 0-40 °C
Double Insulated
Rated Impulse voltage Cat 1 – 1500v
Pollution control Degree2
Enclosure protection IP30
Case material Thermoplastic, flame retardant
Dimensions 86mm x 86mm x 36.25mm
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Leaflet number P84072 Issue 1
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