Specifications
DT90 DIGITAL ROOM THERMOSTAT
2 EN0H 8578 UK07 R1 12/08
SPECIFICATIONS
CONTROLS / DISPLAY LAYOUT
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
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
Switch type
SPDT (single pole double throw )
potential free
Electrical rating
230 V, 50…60 Hz, 0.01 A to 8 A
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)
Relay life
100,000 operations minimum
Wiring
Terminal block capable of accepting
wires up to 2.5mm²
Wiring access
Rear, top and left side
ENVIRONMENTAL & STANDARDS
Operating
temperature
0°C to 40°C
Shipping &
storage
temperature
-20°C to 55°C
Humidity
Humidity range 10% to 90% rh, non-
condensing
IP class
IP30
Approvals
CE mark, complying with standards
EN60730-1: 2001, EN60730-2-9: 2002
EN55014-1: 2001, EN55014-2: 1997
WEEE & RoSH compliant
C-tick
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
1.5°C adjustable up to 3°C in 0.1°C
increments
Minimum on/off
time
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
Setpoint default 18°C, adjustable 5°C to
35°C
Fail-safe
operation
If temperature measurement system
fails, unit will continue to operate on the
assumption of a 10% load
METRICS
Dimensions
(unit)
90 x 92 x 27mm
Dimensions
(pack)
93 x 94 x 46mm
Weight (unit)
165g
Weight (pack)
192g
battery low warning
fault indicator
setpoint indicator
off/standby indicator
off/standby button
temperature display
frost protect indicator heating demand indicator
ECO mode countdown timer
ECO button
ECO countdown indicatorECO mode active
setpoint change buttons
DT90A
DT90E