Honeywell DT92 User Manual
FEATURES
DT92
WIRELESS DIGITAL ROOM THERMOSTAT
PRODUCT SPECIFICATION SHEET
The new DT92 family of wireless digital room
thermostats is a range of market leading products
designed to provide comfort with economy in modern
heating systems.
Comprising a battery-powered room thermostat and a
mains switching relay box, DT92 features robust 2-way
RF communications between the units. This allows
signal strength testing to help the installation process.
The RF link between both units is already set (prebound) at the factory, so the product is ready for
immediate installation.
Energy efficiency is addressed by state-of-the-art TPI
control performance and an ECO button energy saving
feature. Applications include control of gas or oil-fired
boiler systems, underfloor heating, electric heating and
zoning systems.
With a modern fresh look that complements any style
of décor, and a range of valued features for users and
installers alike, DT92 sets the standard for simple
environmentally-friendly wireless room thermostats.
•
Energy saving TPI control performance
• Advanced self-learning control adapts to the
environment and ensures close temperature
control with minimum energy usage
• Slim modern styling
• Simple user interface with large high contrast
display and easy-to-read characters
• Display shows room temperature, with option to
inquire about setpoint
• 5°C to 35°C setpoint range with 0.5°C
increments, using ▲ and ▼buttons
• Off/standby button, allowing manual switch off,
with frost protection active
• Adjustable off/standby setpoint 5°C to 16°C or
DT92 can be set to off completely
• Room thermostat is battery powered by 2 x AA
(LR6) alkaline cells giving up to 4 years battery
life (minimum 2 years), with battery low warning
• Simple battery change by unclipping front cover
• Relay switching box is 230Vac mains powered
with 24…230Vac SPDT potential-free contacts
• 5 A resistive, 3 A inductive switch rating
• 2-way RF communications at 868MHz radio
frequency band, giving typical reliable range of
30m in houses
• Transmission and signal strength test features
to guarantee good room thermostat placement
• RF link between units is pre-set at the factory
• Installer Mode allows operation to be
customised for the application and the needs of
the user
• NVRAM storage of setup parameters, ensuring
these are never lost
• Setpoint limits can be programmed in
• Special ‘fail-safe’ mode, should RF
communications be temporarily lost
• Manual override possible at relay box
• Optional table stand supplied for thermostat
FEATURES UNIQUE TO DT92E ECO MODEL
• Energy saving ECO button allows user to
change to a lower, energy saving setpoint for a
timed period of their choosing (1…24 hours)
• Display shows countdown of time remaining in
ECO energy saving mode
EN0H 8580 UK07 R1 03/09
SPECIFICATIONS
Room thermostat
Power supply : 2 x 1.5V IEC LR6 (AA) Alkaline cells
Battery life : Minimum 2 years (with correctly specified
Battery low
warning
Battery
replacement
Relay Box
Power supply : 230 V, 50…60Hz 1VA max. Note –
Switch type : SPDT (single pole double throw )
Electrical rating : 24…230 V, 50…60 Hz, 5 A resistive, 3 A
Relay life : 100,000 operations minimum
Wiring : Terminal block for mains and relay wiring,
Wiring access : Rear and left side
ELECTRICAL
alkaline cells)
: Display indicates when battery power
reserve is low. Unit will continue to
function for a minimum of 4 weeks after
the first indication is given
: Configuration settings stored in NVRAM,
so are retained during battery
replacement
requires permanent mains power supply
potential free
inductive (0.6pf)
for wires up to 2.5mm²
RF SPECIFICATION
Operation band : ISM (868.0-868.6) MHz, 1% duty cycle
Communication
range
Communication
technology
Blocking
immunity
RF binding
method
RF test features : Transmission and signal strength tests to
: 30 m in a residential building environment
: 2-way RF, using short, high rate
transmissions to minimise air time and
avoid collisions
: Receiver class 2 (ETSI EN300 220-1
version 2.1.1)
: Units are pre-bound at the Factory. Field
re-binding can be done, if required
assist location of components
ENVIRONMENTAL & STANDARDS
Operating
temperature
Shipping &
storage
temperature
Humidity : Humidity range 10% to 90% rh, non-
IP class : IP30
Approvals : CE mark, complying with standards
: 0°C to 40°C
: -20°C to 55°C
condensing
EN60730-1 (2001), EN60730-2-9 (2002),
EN55014-1 (2006), EN55014-2 (1997),
ETSI EN300 220-3, ETSI EN301 489-3
: WEEE & RoHS compliant
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
TEMPERATURE CONTROL
Sensing element : 10K (@25°C ) NTC thermistor
Temperature
setting range
Control form : Self-learning TPI Fuzzy Logic algorithm
Proportional
band
Minimum on/off
time
Cycle rate : Adjustable to suit the application 3, 6, 9,
Temperature
control accuracy
Frost protection : 5°C when thermostat switched to
Positive off : Positive off possible (no frost protection)
ECO energy
saving
Fail-safe
operation
Relay box
manual override
: 5°C to 35°C setpoint range in 0.5°C
increments
: 1.5°C adjustable up to 3°C in 0.1°C
increments
: 1 minute, adjustable up to 5 min in 1 min
increments
12 cycles per hour
: ± 0.5°C (or better) at 20°C, 50% load and
3°C /hour temperature ramp
off/standby, adjustable 5°C to 16°C
: Frost protection not available in cooling
mode
by setting in Installer Mode
: Setpoint default 18°C, adjustable 5°C to
35°C
: If temperature measurement system fails,
unit will continue to operate on the
assumption of a 10% load
: If RF communication fails, relay box can
be set to switch off or operate at 20% on
: Pressing the button on the relay box will
temporarily override the current relay
position. The relay status may change
with the next communication from the
room thermostat
USER INDICATIONS
Information : Current room temperature, setpoint,
off/standby mode, relay box relay status
(flame), RF communication, ECO mode
active, ECO mode countdown.
Warnings : Frost protection, internal fault, battery
low, loss of RF communications.
: Lockout (operation not permitted) and
boiler fault are possible, depending on
application and configuration of other RF
products.
METRICS
Dimensions : 90 x 92 x 27mm (thermostat)
: 90 x 92 x 30.5 mm (relay box
: 157 x 115 x 105 mm (pack)
Weights : 154g (thermostat with batteries)
: 96g (relay box)
: 380g (pack)
2 EN0H 8580 UK07 R1 03/09
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
ORDERING SPECIFICATION
Model Description Literature
DT92A1004
DT92E1000
Wireless digital room thermostat
(System pack, comprising DT92A room thermostat + BDR91 Relay Box)
Wireless digital room thermostat with ECO energy saving feature
(System pack, comprising DT92E room thermostat + BDR91 Relay Box)
Multi-lingual
Multi-lingual
Note: the room thermostat and relay box in each system pack are pre-bound (linked together) at the factory. This
means they will recognize and communicate with each other as soon as they are powered up. The complete device
is therefore ready for immediate installation.
CONTROLS / DISPLAY LAYOUT
frost protect indicator heating demand indicator
temperature display
setpoint indicator
fault indicator
battery low warning
Room Thermostat
DT92A
RF co mmunications
indicator
off/standby indicator
Relay B ox
BDR91
Room Thermostat
DT92E
ECO countdown indicatorECO mode active
setpoint chan ge buttons
ECO button
off/standby button
ECO mode co untdown timer
gree n LED, indicates
• rela y on/off status
• transmission test
pus h button
red LED, indicates
• status in binding or reset modes
• loss of RF comm unicatio ns
3 EN0H 8580 UK07 R1 03/09
MAIN FEATURES
Extra-Large Display
The DT92 has a large display, ensuring it is easy to
read and allowing essential information to be displayed,
when required. The large characters and high contrast
screen are especially important for those with impaired
vision.
Simple Interface
The user interface has been made as simple as
possible to make DT92 very easy to use. Buttons have
been labeled ▲ and ▼ to identify them as the means
of increasing and decreasing (respectively) the setpoint
temperature. The display normally shows the actual
room temperature. When one of the buttons is first
pressed, the setpoint temperature is shown flashing,
accompanied by the ▲ and ▼ symbols. Further
buttons presses will increase or decrease the setpoint
in increments of 0.5°C.
Off/Standby Button, with Frost Protection
The off/standby button allows DT92 to switch off the
heating (or cooling) system at the touch of a button. To
prevent accidental switch-off, the button must be held
for 2 seconds to activate the change. When off, DT92
will maintain control at a frost protection setpoint,
factory set to 5°C but adjustable between 5 and 16°C.
If required, frost protection can be switched off, to
provide a positive off function. These adjustments are
made by entering the DT92 Installer Mode.
Installer Mode
The Installer Mode is where DT92 can be configured
for different applications, and customized to meet the
needs of the user. The operating properties that can be
adjusted are called parameters, and these are
described in detail on page 6.
Parameters are as follows:
• Minimum on/off time
• Cycle rate
• Proportional band width
• Temperature measurement offset
• Upper setpoint limit
• Lower setpoint limit
• Energy saving ECO temperature (on DT92E only)
• Selection of heat/cool changeover operation
• Off/Standby setpoint
• Room temperature sensor use (when used with
HR80 intelligent radiator valves
• Failsafe operation mode (if RF comms are lost)
• HR80 window open function enabling
• HR80 local override function enabling
• Reset all parameters to factory settings
Installer Mode is entered via a sequence of button
presses. The buttons are also used to scroll between
parameters and to make changes to their values.
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
2-Way RF Communications
RF communications between the room thermostat and
the relay box is 2-way, making it more efficient and
reliable, and allowing the room thermostat to display
information from the relay box, such as actual relay
status or communications loss.
Signal Strength Test Mode
Another benefit of 2-way RF is to allow the room
thermostat to display the strength of the signal that the
relay box is receiving. This ensures the thermostat can
be positioned in the best possible location for system
performance.
Reliable RF Communications in 868MHz band
868MHz is a well regulated band where continuously
transmitting devices are not permitted. Together with a
1% transmission duty cycle, this means the possibility
of interference or clashing messages is minimized, and
increases the reliability of communications.
NVRAM Storage of Settings
All parameter settings are stored in a special kind of
memory called NVRAM so they will be retained
indefinitely even if the batteries are removed.
Advanced Self-learning TPI Control
DT92 uses a self-learning ‘fuzzy logic’ time-proportional
control algorithm. This form of control is better than
conventional PI control as it has a faster response and
better performance in steady state conditions. It
performs equally well in a wide range of different
installations, and ensures energy savings by controlling
closer to setpoint and minimising temperature
overshoots.
Additional Energy saving ECO feature
In a heating system, one of the best ways to save
energy is to reduce the setpoint temperature. The DT92
green ECO button provides a simple and convenient
way of doing this for a period of time of the user’s
choice. The ECO energy saving setpoint is pre-defined
in the Installer Mode. The factory setting is 18°C, but it
can be adjusted (between 5°C and 35°C) to give a
timed boost, if required. When the ECO button is
pressed, the user is given the chance to set the time
required at this new temperature, from 1 hour to 24
hours in 1 hour increments. The display indicates that
ECO mode has been set, and will count down the time
remaining in energy saving mode. Should they wish to
readjust the temperature setting, they can do that too,
using the ▲ and ▼ buttons.
ECO mode is cancelled simply by pressing the ECO
button again.
4
INSTALLATION
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
Installation Process
To ensure best system performance, there is an
optimum sequence of installation operations and test
steps. These are as follows:
1. Install BDR91 relay box, connect to mains, and
power up.
2. Before mounting DT92 thermostat onto backplate,
power it up (activate batteries).
3. Bring DT92 thermostat to a distance 2-3 m from
relay box and initiate RF Communication Test.
This confirms that relay box is wired correctly and
that both devices are bound (linked) to each other.
If this test does not work, the 2 units must be reset
and bound to each other by following the procedure
for Binding / Re-binding.
4. Take the DT92 thermostat to the proposed
mounting location, and initiate the Signal Strength
Test. This will indicate if the thermostat is suitably
positioned to provide a reliable signal for the relay
box. If the signal strength is too low, the thermostat
must be repositioned.
5. When a suitable position is established, the
backplate can be mounted on the wall and the
thermostat can be attached to it.
.
Installing the BDR91 Relay Box
For best performance, the BDR91 Relay Box should be
installed in an open space, at least 30cm distance from
any metal objects including wall boxes and boiler
housing. It should not be mounted on a metal wall box.
Location
a.
5
b.
WIRING CONNECTIONS
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
a.
c.
a. Boiler
b. Boiler (potential free connection)
c. Zone valve
d. Air conditioner
b.
d.
Note: BDR91 Relay Box requires a permanent mains power supply.
Completing the BDR91 Relay Box Installation
6
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