BACnet Product Overview

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Comfort and energy-saving of a HVAC system are all about control. With networking devices, you can monitor and control your equipment via a communication system anywhere and anytime

Control =

Green + Comfort

A Communication Protocol for HVAC

BACnet - A Data Communication Protocol for Building Automation and Control Networks. Developed under the auspices of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

BACnet is an American national standard, a European standard, a national standard in more than 30 countries, and an ISO global standard. The protocol is supported and maintained by ASHRAE Standing Standard Project Committee 135

Protocol maintained by Building-Service

Experts

SSPC Is charged with the maintenance and enhancement of an ASHRAE standard where it has been determined that a group of experts needs to be available to answer questions, and, in general, maintain a standard after it has been promulgated

Preloaded Fan Coil Control program

N

N

Obtained Multiple Certifications

NT800/NT900 thermostats have obtained CE and C-tick certifications

NT800 / NT900 BACnet MS/TP

Networking Thermostats

NT800 / NT900 networking room thermostats are BACnet Master-Slave/Token-Passing (MS/TP) networked devices designed in strict accordance with ASHRAE standard 135-2001 and are considered “native” BACnet devices

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NT800 Stylish appearance

with Large illuminated LCD

NT800 BACnet thermostat is designed in way of stylishness and effectiveness of which comprises easy-to-use LCD, rotary dial buttons and remote controllers. The faceplate is available in white and grey colors.

Easy Buttons &

Rotary Dial

Easy to Mount with standard electrical

box

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NT900 Sophisticated

appearance with Touch-screen LCD

NT900 BACnet thermostat is designed in way of stylishness and effectiveness of which features a large size Touch-screen LCD. LCD is available in vertical and horizontal versions

Easy-to-operate Touch icons

Easy wiring with Pluggable terminal

blocks

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Comprehensive & Convenient Features

NT821 2-wire on-off (2-pipe) NT822 2-wire on-off (4-pipe) NT821F 3-wire floating (2-pipe) NT821A 0-10 VDC (2-pipe) NT822A 0-10 VDC (4-pipe)

White faceplate is available

NT921 2-wire on-off (2-pipe) NT922 2-wire on-off (4-pipe) NT921F 3-wire floating (2-pipe) NT921A 0-10 VDC (2-pipe) NT922A 0-10 VDC (4-pipe)

Vertical LCD is available

● RS485 communication port ● 2-wire on/off, 3-wire floating or 0-10 VDC control ● High current output relays 5A (2A) ● Auto-seasonal changeover sensor ● Remote temp. sensor ● Optional remote controller

● Energy-saving mode ● Remote on-off control ● Thermostat On-off status interlock output ● Additional binary inputs ● Additional binary outputs ● Parameter setup manual ● Adjustable PI values

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Features

Topology The NT800 / NT900 BACnet MP/TP LCD Digital Fan Coil thermostats shall be daisy-chained through a RS-485 network in which the maximum number of networked devices shall be 32 per network segment or 64 networked devices per network trunk if repeaters are used.

Network Architecture

DDC n-1 DDC n

Workstation

DDC 1

Ethernet

BACnet IP

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Redundancy

System Integration

Web Browser

BAC

net M

S/TP

BAC

net M

S/TP

BAC

net M

S/TP

MAIN TEE-OFF OF PAD TO ROOMS

FUSE SPUR UNIT BY ELECTRICAL SUB-CONTRACTOR

MAIN TEE-OFF OF EAD TO ROOMS BLOWER HEAT/COOL

1 1 7

6

5

T-

8 MOTION DETECTOR

WINDOW INTERLOCK CONTROL

CO2 SENSOR

9

11

10

2

3

4

NT800 / NT900 Networking Thermostat

DO AO AI DI

Application 1. EAD and PAD damper interlocks with thermostat on-off status

2-4. 3-speed fan control with 230 VAC output relays

5. 2-wire on-off valve control with 230 VAC output relay

6. 2-pipe heating only / cooling only system control 7. Temperature sensor in return air duct 8. Winter / summer immersion temperature sensor 9. CO2 sensor status

10. Motion detector activates unoccupied mode

11. Window switch activates remote on-off function

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The NT50 Series RS485 Modbus RTU networking LCD Fan Coil applies communication technology of Modbus RTU master/slave protocol to monitor and supervise year around air conditioning units in commercial, industrial and residential Installation. Typical application includes the control of fan coil units, packaged terminal air conditioners and combination heating and cooling equipment, as part of the system that consists of two-way or three-way valve and a multi-speed line voltage fan. The maximum number of NT50 slaves in a Modbus RTU network is 32. The BMG Series is a BACnet network gateway module which routes communication traffic between BACnet MS/TP network and Modbus RTU network. While the BMG (master) communicates on a RS-485 network at its NET1 communication port in BACnet MS/TP protocol, it can support up to 32 units of NT10 or NT50 RS-485 networking room thermostats (slaves) on a RS-485 network at its NET2 communication port in Modbus RTU protocol.

NT50 Modbus RTU LCD Thermostat

~

BMG-MR BACnet MS/TP

Gateway Module

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NT50 Modbus RTU LCD Thermostat

~

BMG-MR BACnet MS/TP

Gateway Module

Network Configuration

BACnet MS/TP Network Notes: 1. Balanced cable is recommended 2. Ensure the cable is installed as a daisy chain

from one device to the next (1,000 m maximum) and the shield is grounded at one single point of the network only.

3. A MS/TP terminator is installed on each end of each MS/TP network.

4. The maximum nodes per MS/TP network is 32 without a repeater.

Modbus RTU Network Notes: 1. Balance cable is recommended 2. Ensure the cable is installed as a daisy chain

from one device to the next (1,000 m maximum) and the shield is grounded at one single point of the network only.

3. A MS/TP terminator is installed on each end of each or Modbus RTU network.

4. The maximum nodes per Modbus RTU network is 32

BMG

To a BACnet MS/TP Network Supervisor

BACnet MS/TP

BMG

Slaves

RS485 Modbus RTU Network

NT50 NT50 NT50 NT50

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Other Products

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Cyrus Valves and Controls Company www.cyruscontrols.com Distributor: