IM 1234-1 • BACNET THERMOSTAT 4
www.DaikinApplied.com
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User Interface
The user interface is a color display and has five push buttons.
Through the menu driven display, an operator can do the
following.
• Add or change user passwords
• Change setpoints
• Set BACnet addressing
• Set up and commission the installation
•
Configure any available options
Security
Separate passwords for users and controls technicians.
Display Type
• 128 × 128 pixels
• Active color LCD with LED back lighting
• 1.00 × 1.04 inches (25 × 26 mm)
Inputs and Outputs
All inputs and outputs are pre-programmed and application
specific. No field configuration is required for most installations.
For details on input and output connections see the section
Application Drawings on page 31
.
Analog Inputs
Analog inputs represent BACnet analog input objects and are
configured for discharge air temperature, remote temperature
sensor, water temperature sensor, and fan status. Not all input
sensors are applicable or required for all models.
• Sensors are automatically detected
•
Inputs accept industry-standard 10,000Ω, Type II or Type
III thermistor sensors
• Input overvoltage protection up to 24 volts AC, continuous
• 12-bit analog-to-digital conversion
• Short-circuit protected
• Loads up to 10 mA at 0-12 volts DC
• 8-bit PWM digital-to-analog conversion
Relay Outputs
Relay outputs are configured to represent BACnet binary
objects. The outputs control ON/OFF valves, speeds for three-
speed fans, fan start circuits, or other equipment that requires
an on or off input signal.
• All relay outputs are normally open, SPST, Form “A”
relays
• 1 Ampere maximum per relay at 24 volts AC or DC for
each output. Maximum for all relay outputs is 3 amperes
(72VA)
Connectors
• Screw terminal block mounted to backplate
• Wire size 14-22 AWG
Communications – BACnet MS/TP
• Integral peer-to-peer BACnet MS/TP network
communications
• Network speeds from 9600 to 76,800 baud
•
Front panel configurable device instance, MAC address,
and baud
• Automatic baud detection
• Screw terminal block mounted to backplate; wire size
14-22 AWG
• Meets or exceeds ANSI/ASHRAE BACnet Standard 135-
2008 for Application Specific Controllers
Accuracy
Type
Thermistor
Accuracy
±0.36°F (±0.2°C)
Resistance
10,000Ω at 77°F (25°C)
Operating Range
48 to 96°F (8.8 to 35.5°C)
Regulatory
• UL 916 Energy Management Equipment
• FCC Class A, Part 15, Subpart B and complies with
Canadian ICES-003 Class B
• SASO PCP Registration KSA R-103263
This device complies with part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) This device may
not cause harmful interference, and (2) this device must accept
any interference received, including interference that may
cause undesired operation.
