Honeywell DT90 Handleiding

Honeywell Thermostaat DT90

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Pagina 1/8

EN0H 8578 UK07 R1 12/08

DT90

DIGITAL ROOM THERMOSTAT

PRODUCT SPECIFICATION SHEET

The new family of digital room thermostats is a DT90

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- - -art TPI of the

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, sets the standard for simple DT90

environmentally-friendly room thermostats.

FEATURES

 Energy saving TPI control performance

 Advanced -learning control adapts to the self

environment and ensures close temperature

control with minimum energy usage

 Slim modern styling

 Large high contrast display with easy- -read to

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

increme nts

 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 rati ng

 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

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 46 mm

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

DT90 DIGITAL ROOM THERMOSTAT

3 EN0H 8578 UK07 R1 12/08

ORDERING SPECIFICATI ON

Extra-Large Display

The DT90 display is more than double the size of its

predecessor, ensuring it is even easier to read and

allowing more 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 DT90 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 DT90 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, DT90

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 DT90 Installer Mode.

Installer Mode

The Installer Mode is where DT90 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 DT90E only)

 Selection of heat/cool changeover operation

 Oﬀ/Standby setpoint

 Electric heat operation

 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.

MAIN FEATURES

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

DT90 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.

Addition Energy saving ECO feature al

In a heating system, one of the best ways to save

energy is to reduce the setpoint temperature. The DT90

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 , but it °C

can be adjusted (between 5 ) to give a °C and 35°C

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 buttons. ▲ and ▼

ECO mode is cancelled simply by pressing the ECO

button again.

24 …230V 8(3)A SPDT Potential Free Contact Rating

The DT90 switching relay has a high speciﬁcation and

wide switching range, suitable for most domestic

applications. As the thermostat is battery powered, only

a 2 wire connection is required to operate the load.

Electric heating loads up to 8A (1.6kW) can be switched

directly, but please note that if more than 3A is being

switched, the electric heat parameter EH should be set

to value = 1 in the Installer Mode. This ensures the

relay is operated with a higher energy, to switch higher

currents reliably.

Model

Description

Literature

DT90A1008

Digital room thermostat

Multi-lingual

DT90E1012

Digital room thermostat with ECO energy saving feature

Multi-lingual

Product specificaties

Merk:	Honeywell
Categorie:	Thermostaat
Model:	DT90
Kleur van het product:	Wit
Breedte:	90 mm
Diepte:	27 mm
Hoogte:	92 mm
Beeldscherm:	LCD
Accu/Batterij voltage:	230 V
Nauwkeurigheid:	0.5 °C
Levensduur batterij/accu:	2 jaar
Ondersteund aantal accu's/batterijen:	2
Memory-functie:	Nee
Temperatuur omvang (T-T):	5 - 35 °C
Afstandsbediening inbegrepen:	Nee
Batterijen inbegrepen:	Ja