NT-303 · NT-304

NT-303 · NT-304 is a LoRaWAN room thermostat for 2- and 4-pipe fan coils. NT-303 drives on/off valves and a 3-speed fan through 5 relays; NT-304 drives 0–10 V valves or an EC fan through 3 relays and 2 × 0–10 V outputs. The 2.7″ E-ink screen shows temperature, humidity, target temperature and mode; temperature and humidity sensors are built in, with an NTC sensor input and an input for a keycard switch or window sensor. The thermostat stores 8 schedule plans, provides freeze protection and works in LoRaWAN Class C, so it accepts commands at any time, including group commands via multicast. It is powered from 100…240 V AC mains and configured via NFC from a smartphone and by downlink commands.

Features

For 2- and 4-pipe fan coils: relay or 0–10 V outputs;
2.7″ E-ink screen: temperature, humidity, target temperature and mode;
Temperature and humidity sensors, NTC sensor input;
Input for a keycard switch or window sensor;
8 schedule plans, freeze protection;
Configuration via NFC from a smartphone and by downlink commands;
Applications: remote climate control via LoRaWAN, replacing wired fan coil controllers, group control via multicast, energy saving with keycard and open-window detection.

Specifications

LoRaWAN regional plans: EU868 · IN865

General

Screen	2.7″ E-ink, black and white
Control buttons	5
Configuration	NFC, downlink
Mains supply, 50…60 Hz	100 … 240 V AC
Power consumption, no load, W	< 2
Operating temperature: device · screen, °C	−20 … +60 · 0 … +40
Humidity, non-condensing, %	0 … 95
Housing, protection	PC + ABS, white, UL94 V0, IP20
Dimensions, mm	86 × 86 × 42
Wall box: square / round, mm	86 / 60
Wire cross-section, mm²	0.13 … 2.08 (AWG 26…14)

Measurement

Temperature: range · resolution, °C	−20 … +60 · 0.1
Temperature accuracy, °C	±0.5 (0…+60 °C) / ±1 (−20…0 °C)
Humidity: range · resolution, % RH	0 … 100 · 0.1
Humidity accuracy: typ. / max, % RH	±2 / ±5

Fan coil control

NT-303 outputs	5 relays: on/off valves, 3-speed fan
NT-304 outputs	3 relays and 2 × 0–10 V: 0–10 V valves or EC fan
2-pipe, 2- or 3-wire on/off valve	3-speed fan — NT-303; EC fan 0–10 V — NT-304
2-pipe, 0–10 V valve	NT-304 with either fan
4-pipe, 2 × 2-wire on/off valves	3-speed fan — NT-303; EC fan 0–10 V — NT-304
4-pipe, 2 × 0–10 V valves	NT-304 with a 3-speed fan
Relay current: resistive / inductive, A	4 / 3
Target temperature, °C	5 … 35, step 0.5 or 1
Modes	heating, cooling, ventilation
Inputs	1 NTC, 1 dry contact (DI)

LoRaWAN

Specification version	1.0.2 / 1.0.3
Class, activation	Class C, OTAA / ABP
Tx power (868 MHz), dBm	16
Sensitivity, dBm	−137
Antenna	internal
Reporting interval, min	1 … 1440 (default 10)

Supply

Package contents	thermostat, 2 × M4×25 screws, M2×4 locking screw, DI input signal cable, product passport, warranty card

Documentation

Datasheets

Datasheet PDF

Versions

Part number	Version
NT-303/[F]	5 relays: on/off valves, 3-speed fan.
NT-304/[F]	3 relays and 2 × 0–10 V outputs: 0–10 V valves or EC fan.