DT90
DT90
DIGITAL ROOM THERMOSTAT
PRODUCT SPECIFICATION SHEET
The new DT90 family of digital room thermostats is a
range of market leading products designed to provide
comfort with economy in modern heating systems.
Its large display and simple button interface make
DT90 extremely easy to use.
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, DT90 sets the standard for simple
environmentally-friendly room thermostats.
FEATURES
• 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
• Large high contrast display with easy-to-read
characters
• Simple user interface
• Temperature setting procedure eliminates the
risk of accidental setpoint change
• Display shows room temperature, with option
to inquire about setpoint
• 5°C to 35°C setpoint range with 0.5°C
increments
• Temperature set using up or down buttons
• Off/standby button, allowing manual switch off,
with frost protection active
• Adjustable off/standby setpoint 5°C to 16°C or
DT90 can be set to off completely
• Battery powered by 2 x AA (LR6) alkaline cells
• Up to 4 years battery life (minimum 2 years),
with battery low warning
• Simple battery change by unclipping front
cover
• Installer Mode allows the thermostat 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
• 24…230Vac SPDT potential-free contacts for
simple 2-wire installation
• 8 A resistive, 3 A inductive switch rating
• Surface or switch-box mounting options
• Sensor fault self-diagnostics
• Heat/cool changeover operation mode possible
FEATURES UNIQUE TO DT90E 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 8578 UK07 R1 12/08
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CONTROLS / DISPLAY LAYOUT
frost protect indicator heating demand indicator
DT90A
DT90E
DT90 DIGITAL ROOM THERMOSTAT
ECO countdown indicatorECO mode active
temperature display
setpoint indicator
fault indicator
battery low warning
off/standby indicator
SPECIFICATIONS
ELECTRICAL
Power supply : 2 x 1.5V IEC LR6 (AA) Alkaline cells
Battery life : Typically 4 years, minimum 2 years (with
correctly specified alkaline cells)
Battery low
warning
Switch type : SPDT (single pole double throw )
Electrical rating : 230 V, 50…60 Hz, 0.01 A to 8 A
Relay life : 100,000 operations minimum
Wiring : Terminal block capable of accepting
Wiring access : Rear, top and left side
ENVIRONMENTAL & STANDARDS
Operating
temperature
Shipping &
storage
temperature
Humidity : Humidity range 10% to 90% rh, non-
IP class : IP30
Approvals : CE mark, complying with standards
: Display will indicate when battery power
reserve is low. Unit will continue to
function for a minimum of 4 weeks after
the first indication is given
potential free
resistive, 0.1 A to 3 A inductive (0.6pf)
: 24 V, 0…60 Hz, 0.01 A to 8 A resistive,
0.1 A to 3 A inductive (0.6pf)
wires up to 2.5mm²
: 0°C to 40°C
: -20°C to 55°C
condensing
EN60730-1: 2001, EN60730-2-9: 2002
EN55014-1: 2001, EN55014-2: 1997
: WEEE & RoSH compliant
: C-tick
setpoint change buttons
ECO button
off/standby button
ECO mode countdown timer
TEMPERATURE CONTROL
Sensing element : 10K (@25°C ) NTC thermistor
Temperature
setting range
: 5°C to 35°C setpoint range in 0.5°C
increments
Control form : Self-learning TPI Fuzzy Logic algorithm
Proportional
band
Minimum on/off
time
: 1.5°C adjustable up to 3°C in 0.1°C
increments
: 1 minute, adjustable up to 5 min in 1 min
increments
Cycle rate : Adjustable to suit the application 3, 6, 9,
12 cycles per hour
Temperature
control accuracy
: ± 0.5°C (or better) at 20°C, 50% load and
3°C /hour temperature ramp
Frost protection : 5°C when thermostat switched to
off/standby, adjustable 5°C to 16°C
: Frost protection not available in cooling
mode
Positive off : Positive off possible (no frost protection)
by setting in Installer Mode
ECO energy
saving
Fail-safe
operation
: 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
METRICS
Dimensions
(unit)
Dimensions
(pack)
Weight (unit) : 165g
Weight (pack) : 192g
: 90 x 92 x 27mm
: 93 x 94 x 46mm
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