Secure SRT323 Operating instructions

SRT323
User and Installation Instructions
1
Electronic Room Thermostat & Temperature
Sensor (Tx) - Z-Wave

The SRT323 is a battery powered electronic thermostat
that opens or closes a relay to control central heating. It
provides optimum comfort with precise control of
energy used to heat the home. It uses interoperable RF
mesh networking technology to provide a means of
remotely controlling the demand temperature and to
report back the relay state.
The SRT323 will only operate when 2 x AAA batteries
have been fitted.
This document provides information specific to the Z-
wave technology implemented on SRT323, to ensure
interoperability with third party devices.
The SRT323 has been developed to control central
heating systems where the demand temperature can
be set locally or remotely by a third party device. The
SRT323 also has the capability to act as a temperature
sensor.
2

The Secure SRT323 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 anticlockwise to
decrease it and clockwise
to increase it.
USER INSTRUCTIONS
3

The thermostat may be operated as an
ordinary wired thermostat with no radio
connection necessary. In this condition no
radio wave symbol is displayed.
In the following description, it is assumed
that the thermostat has been incorporated
into a Z-Wave system.
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 approximately 7 seconds
before returning to the set temperature.
4

The aerial symbol complete with radio
wave symbols in the display of the
SRT323 thermostat indicates that it is
wirelessly communicating with the rest of
the system.
If the SRT323 is connected to a wider wireless system,
a flashing radio wave would indicate 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 Wireless System Setup
instructions on page 9.
5

6
Battery Replacement
The SRT323 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.
7
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.

8
DIL switch settings
On the rear of the unit in the center there are DIL switches that control
TPI and installation mode as described below
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 2 and 3 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. Switch positions for
different TPI settings.
Installation Mode
Set DIL switch 1 to 'ON' to enter installation mode
To exit installation mode change DIL switch 1 to 'OFF'
INSTALLER INSTRUCTIONS

Wireless System Setup
Navigating the setup menu
Please refer to the 3rd party manufacturers instructions of
the Z-Wave controller or gateway that will be used in
conjunction with the SRT323 to determine how to add the
SRT323 to that controller/gateway.
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 SRT323 will report a failure.
9

10
Mode
Indication Z-Wave Function
n
L
Li
Transmit Node Information Frame (NIF)
Learn Mode - use this command for: 1, 3
Include to or exclude from a controller (see page 11)
Receive Period Enabled (Listening)
This function will keep the unit awake for 60sec to receive
commands, no pass or fail response will be provided