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WTW 900

Digital weekly thermostat

Application

WTW 900 consists of :

WTB 900: This device is a battery-powered digital weekly thermostat for controlling room temperature on three levels: Comfort, Economy or Off/Antifreeze.
Its main characteristic is the lack of electrical connections; indeed the ON and OFF signals are transmitted to the receiving unit by radio, making this device easy and cheap to install, especially when there is no existing electrical system available.
WTR 900 : One-channel receiver designed to switch on loads (more precisely, electro-thermal valves or circulators) via radio in home or office heating/cooling systems.
It has 1 channel that can be associated with an independent transmitter (wireless thermostat or thermostat). This system is an optimal solution for buildings in which wires cannot be laid between thermostats and the environment to be controlled.

Catalogue

Code	Description	Data Sheet
WTW 900	Digital weekly thermostat.	–

Features

Data sheet

TECHNICAL DATA WTB 900

Power supply: 2 x 1.5V, alkaline batteries (Type AA)
Battery life: > 2,5 years
Frequency: 868,150 MHz
Modulation: GFSK
Effective radiated power (ERP):< 1 mW
Antenna type: Internal
Max. receiver distance: >300 m in free air; >50 m in buildings (depending on the building and environment)
Room temperature
Regulation range: comfort: 5,0 .. 35,0°C; economy: 5,0 .. 35,0°C
Hysteresis: 0,2°C adjustable 0,1 .. 5,0 °C
Sensor type: NTC 4K7 ohm ±1% @ 25°C
Resolution: 0,1°C (T > 0,0°C); 0,2°C (T < 0,0°C)
Range: -9,9°C .. +50,0°C
Precision: ±1,0°C
Floor temperature (external sensor)
Regulation range: Lower limit: 10 .. 30°C
Upper limit: 20°C .. 50°C
Sensor type: NTC 4K7 ohm ±1% @ 25°C
Resolution: 0,1°C (T > 0,0°C); 0,2°C (T < 0,0°C)
Range: -9,9°C .. +60,0°C
Precision: ±1,0°C
Wires’ maximum length to the remote sensor: 15 m
Antifreeze: OFF/0.5°C .. 25.0°C (Default 3.0°C)
Offset: ± 5.0°C. (Default 0.0°C)
Backlight turns off: 20 sec. after the last pressing of a button
Protection rating: IP 30
Classification under reg. 2013.811.EC:
Class: IV
Contribution to energy efficiency: 2%
Equipment class: III
Number of manual cycles: 1.000
Number of automatic cycles: unlimited
Software class: A
EMC test voltage: 3V
EMC test current: 30mA
Ball pressure test temperature: 75°C
Operating temperature: 0°C .. +40°C
Storage temperature: -10°C .. +50°C
Humidity limits: 20% .. 80% RH non-condensing
Enclosure: Material: ABS+PC V0 self-extinguishing
Colour: Cover: Signal white (RAL 9003)
Base: Anthracite (RAL 7016)

TECHNICAL DATA WTR 900

Technical features
Power supply: 230V~ 50Hz
Absorption: 11VA
Relay contacts ratings: 6A 250V~ (voltage free)
Regulation hysteresis : 0,3°C
Frequency: 868,150 MHz
Sensitivity: -105 dBm
Modulation: GFSK
Bandwidth (-3 dB): 100 KHz
Type of antenna: internal stylus
Max. distance from transmitter: >300m in free field; >50 m in buildings (depending on the building and environment)
Protection rating: IP 4X
Type of action: 1
Pollution degree: 2
Equipment class: II ( )
Rated impulse voltage: 2500V
Number of manual cycles: 50000
Number of automatic cycles: 100000
Software class: A
EMC test voltage: 230V~ 50Hz
EMC test current: 45 mA
Distances tolerances fault mode ‘short’ exclusion: ±0,15 mm
Ball pressure test temperature: 75 °C
Operating temperature: 0°C .. 40 °C
Storage temperature: -10°C .. +50 °C
Humidity limits: 20% .. 80 % RH noncondensing
Enclosure: Material: ABS V0 self-extinguishing
Colour: Signal White (RAL 9003)
Installation: Wall mounted

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Digital weekly thermostat

WTW 900