SRT321
User and Installation Instructions
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Electronic Room Thermostat &
Temperature Sensor (Tx) - Z-Wave
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The SRT321 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 SRT321 will only operate when 2 x AAA batteries
have been fitted.
This document provides information specific to the Zwave technology implemented on SRT321, to ensure
correct interoperability between third party devices.
The SRT321 has been developed to control central
heating systems where the demand temperature can
be set locally or remotely to a third party device. The
SRT321 also has the capability to act as a temperature
sensor.
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The Secure SRT321 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
se t ti n g an d ca n b e
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.
USER INSTRUCTIONS
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When the thermostat is in the ‘call for heat’
condition a flame symbol will appear in the
display.
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.
The aerial symbol complete with radio wave
symbols in the display of the SRT321
thermostat indicates that it is communicating
satisfactorily with the rest of the system.
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 send a temperature update to a controller. If
this has no effect please see Z-Wave pairing
instructions on page 6.
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A radio mast symbol with no radio waves
indicates that the SRT321 has not been
signed on to enable it to communicate with
the Z-Wave system. 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 Z-Wave
pairing instructions on page 12.
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Battery Replacement
The SRT321 runs on 2 x type AAA (Alkaline) non
rechargeable batteries and is designed to give a battery
life of approximately two years – under normal usage
conditions.
Battery should
be changed
immediately
Low battery symbol
appears first when
the batteries are
nearing the end of
their life.
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.
Please dispose of old batteries
responsibly
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.
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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.
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Fitting the SRT321 Room Thermostat
Avoid installing the thermostat against or behind any
large metal surfaces which could interfere with the radio
signals. The SRT321 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.
Offer the plate to the wall in the position where the
SRT321 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 into its
plug-in terminal block.
Tighten the 2 captive screws on the
underside of the unit.
Now ensure that the 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.
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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.
ŸDIL switch numbers 7 and 8 should be
set as diagram opposite.
ŸFor Gas boilers set the TPI setting to 6
cycles per hour. (Default setting)
ŸFor Oil boilers set the TPI setting to 3
cycles per hour.
ŸFor 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
TP[
3
TP[
6
TP[
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SWITCH CONFIGURATION SRT321
7
8
Switch positions for
different TPI settings.
INSTALLATION MENU / INSTRUCTIONS
Set DIL switch 1 to ’ON’ position on the back of the unit,
scroll through the function menu by rotating the dial, to
select the required function press the dial. On selecting
a function the character will start flashing while waiting
for a response from the 3rd party device, a successful
response will display a P after the character and a
failure will be displayed with an F.
If no response has been received from a 3rd party unit
within the time-out period, the SRT321 will report a
failure.
To exit installation mode, change DIL switch 1 to its
‘OFF’ position.
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Mode
Indication
Z-Wave Function
I
E
N
L
Li
P
A
D
C
Include Node onto network 1, 4
Exclude Node from network 1, 4
Transmit Node Information Frame (NIF) 2
L Learn Mode - use this command for: 1, 5
Include or Exclude with another controller (does not support
control group replication) Inclusion and reception of a primary
role
Receive Period Enabled (Listening).
This function will keep the unit awake for 60sec, no Pass or
Fail response will be provided
Protocol Reset 2 - Press twice to activate
Will restore all parameters back to factory default settings
Associate Control Unit 3, 6
Disassociate Control Unit 3, 6
Controller Shift 3
This function allows the installer to manually relinquish the
primary controller role of the SRT321 to become a secondary
or inclusion controller.
1 Once the character starts flashing the installer has
60 sec to activate the 3rd party unit, once the 3rd
party unit has been activated the process must be
completed within 240 sec or SRT321 will timeout.
2 If an outcome is not received within 5sec the
SRT321 will report a failure.
3 On selecting this function the installer has 60s to
initiate a 3rd party unit before the SRT321 times
out and reports a failure
4 Nodes supporting ‘Thermostat Mode Command
Class’ will be associated/dissociated with Group 1
and nodes supporting ‘Binary Switch Command
Class’ will be associated/dissociated with Group 2.
5 All association settings will be lost if learn mode has
been activated with another controller regardless of
a pass or fail result, any associations settings will
have to be re-configured either remotely or manually.
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6 Nodes can be added/removed from any of the
groups in the ‘Association Command Classes’ by
using these commands.
7 In the instance both ‘Thermostat Mode’ and ‘Binary
Switch’ Command Class are supported, the
SRT321 will default to use the ‘Thermostat Mode
Command Class’.
Network Update Scheme
When the unit is a secondary or inclusion controller with
a SUC/SIS present, the unit will request network
updates once every 23 hours.
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SUPPORTED DEVICE AND COMMAND CLASSES
Z-Wave Device Classes
Generic Device Class THERMOSTAT GENERIC DEVICE CLASS
Specific Device Class SPECIFIC TYPE NOT USED
Basic Device Class PORTABLE CONTROLLER
Implemented Device Classes
Z-Wave Command
Classes
Manufacturer Specific Secure Manufacture ID
Command Class
Version Command Class Provides the version number of the Software
Thermostat Mode This Command Class will use thermostat modes
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Command Class ‘OFF’ and ‘HEAT’ to control a 3rd party unit.
The SRT321 will be associated in group 1.
Binary Switch This will use SET commands to control a 3rd
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Command Class Party unit, and be associated in group 2.
Multi Channel The SRT321 will respond to the Multilevel
Command Class Sensor GET command with a Multilevel Sensor
REPORT. This report can be requested or sent
unsolicited to the nodes in Group 5.
If the temperature sensor functionality is
disabled, the SRT321 will report 0x8000.
Description
Continued on next page...
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Basic Command Class This command class is not supported
Battery Level Provides the current battery voltage level Battery
Command Class Level Reports and Low Battery Warnings
(Battery Level Reports with parameter = 0xFF)
can be sent unsolicited to nodes in Group 3.
Wake Up Command Wake Up Commands are available through the
Class (Ver 2) ‘Wake Up Capabilities Report’. Default wakeup
settings will be used if the unit is not included
onto a network or has not received a valid wake
up interval.
Thermostat Set Point Set Point type of Heating is supported.
Command Class The SRT321 will accept Set Point SET
commands if the set point type matches the
thermostat type configuration.
SRT321 will send a Set Point REPORT in
response to a Set Point GET message or
unsolicited message can be sent to nodes in
Group 4 when the set temperature is changed
locally on the SRT321.
Continued on next page...
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Association The following association groups are supported:
Command Class Group 1 - Nodes controlled by Thermostat Mode
SET command.
Group 2 - Nodes controlled by Binary Switch
SET command.
Group 3 - Nodes to receive unsolicited Battery
Level Reports or Low Battery Warnings.
Group 4 - Nodes to receive Thermostat Set Point
Reports.
Group 5 - Nodes to receive unsolicited Multilevel
Sensor Reports.
Each group contains a maximum of 4 nodes
Configuration The unit supports 3 single byte configurations for
Command Class the temperature sensor in the range 1-3
respectively.
Configuration Parameter Number 1, Default = 0
0x00 - 0x7F Disables the temperature sensor.
0x80 - 0xFF Enables temperature sensor.
Configuration Parameter Number 2, Default = 0
0x00 - 0x7F Celsius.
0x80 - 0xFF Fahrenheit.
Configuration Parameter Number 3, Default =
10 (1.0˚C)
1 to 100 - Delta Temperature in 0.1˚C steps
Note: All command classes are version 1 unless otherwise stated.
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Thermostat specifications SRT321
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: Yes
Case material: Thermoplastic, flame retardant
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Note: To preserve battery life in a wider system, it is
recommended that minimum default values are set for the
following parameters:
Ÿ Wake up Interval: 15 Minutes (min)
Ÿ Temperature Report: Δ0.5°C (min) and/or Wake up (15 Mins)
Leaflet Number P84073 Issue 1
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Cewe Instrument AB
Box 1006
611 31 Nyköping
Tel: +46 8 600 80 60
Email: info@securetogether.eu
Web Site: www.securetogether.eu
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