DS-BAST421C-AA0 Data Sheet – BASstat 421C BAST-421C – BACnet Communicating Thermostat for Modulating Fan Coil Operation The BASstat series of BACnet-compliant wired or wireless communicating thermostats ensure effortless integration into BACnet/IP (Wi-Fi) or BACnet MS/TP (EIA-485) networks. These thermostats are suited for modulated heating, cool- ing, and ventilation with analog output control in 4-pipe applications such as Fan Coil Units (FCU) or Air Handlers. A configurable control algorithm allows adaptability to the specific application. This adaptive algorithm applied to the modulated valve control saves energy and ensures com- fort for the occupants. Three sensing options are available: built-in temperature sensor, input for remote temperature sensor, or temperature override network command from Building Automation System. Occupancy status can be set from thermostat buttons, a wired ESI input, or over the BACnet network. Thermostat buttons are optionally lockable to prevent unauthorized control or configuration changes. Digital display with graphical icons is easy to read and understand. NOTE: This unit is designed for 4-pipe HVAC systems and not recommended for 2-pipe HVAC systems. Versatile BACnet Communication in Two Distinct Models • BACnet MS/TP in B2 models with MS/TP baud rates 9.6kbps - 76.8kbps (BTL Listed) • BACnet/IP in BW2 models with 802.11 b/g/n 2.4GHz Wi-Fi • Both B2 and BW2 models are BACnet compliant with a B-ASC device profile Flexible Installation • 24VAC (+/-10%) power input • Digital Display with graphical icons of operation, °C or °F display • Modulating valve control, analog Outputs for Fan Coil Operation • Suitable for 4-pipe modulating heat/cool control applications with manual or automatic changeover NOTE: 2-pipe heat/cool applications and floating-type valve actuators are not supported by this device • Occupied/Unoccupied modes with 2 sets of Cool/ Heat set points • Effective run time accumulation for energy consumption calculations • Built-in temperature sensor • Remote temperature sensor input (NTC Thermistor 3kΩ) • Occupancy status can be switched (1) locally by the user, (2) by using a separate occupancy sensor, or (3) by using BACnet network command • Networked current temperature override from BACnet client (BMS) • Fully Configurable Algorithm control parameters: Deadband, Proportional Gain, Integral Rate, Stage Trip Points, Stage Widths, Short Cycle Delay, Maximum Cycles Per Hour • Stand-alone operation with setpoints reset and schedule from BACnet BMS or optional full BACnet BMS control Wi-FiDS-BAST421C-AA0 Data Sheet – BASstat 421C 2 BASstat – Overview The BASstat’s white backlit LCD display is large and easy to read, even from a distance. It incorporates graphical icons to aid visual indication of current state of operation. Several icons indicate parameters such as: Active Mode, Cooling stage 1 or 2, Heating stage 1 or 2, Ventilation Only, Fan Active, Occupied/Unoccupied state, and Clock icon to indicate Short Cycle Delay or Max Cycles per hour active waiting state. These icons are very useful in indicating the thermostat’s current state of operation. Six buttons on the BASstat allow users to manipulate temperature set point, change HVAC modes, turn the thermostat ON/OFF, and more. Pressing the Set and Up/Down buttons can manually toggle the thermostat from occupied/unoccupied modes, where BACnet occupancy command is not an option. All 6 of these buttons are lockable in a configurable manner to prevent unauthorized configuration change. Some or all buttons can be locked for application flexibility, making the stat suitable for applications where limited user control is allowed. • Non-volatile memory (EEPROM) retains user settings during power loss • Lockable buttons/user interface • Operating Environment: 0-50°C, 5-95% RH (non-condensing) • Wiring: 14 to 22 AWG wires or 1.5mm 2 wires • Dimensions: 94×118×34 mm (W × H × D) • Mounts directly onto wall, panel, standard 65×65 mm junction box (hole pitch 60 mm) or standard 2×4 inch vertical junction box (hole pitch 83.5 mm) MODE Button Changes modes Heat/Cool/Vent and used for accept/confirm button in Engineering menu FAN Button Toggle to change Fan mode: Auto or Continuous UP & DOWN Buttons Increase & decrease setting or previous/next item. Hold both buttons for 5 sec. to enter Engineering mode. SET Button Toggle Occupied/ Unoccupied Setting ON/OFF Button Turn thermostat On or Off Set-Point Icon Displays set-point temperature while flashing Fan Status Icons Indicate Fan status AUTO or Continuous. AUTO state when displayed. Fan active when icon is spinning. Fan speed indicator bars (some models are 1 speed only). Snowflake Icon Indicates working in Cooling mode Rising Steam Icon Indicates working in Heating mode Wind Icon Indicates working in Ventilation mode Working Icon Indicates mechanical Cooling/Heating Stage is engaged LCD Displays temperature and working status Sun Icon Indicates Occupied status Moon Icon Indicates Unoccupied Status DP Wi-Fi ACTIVE and connecting to network when flash- ing. Icon disappears upon successful connection. (BW2 Wi-Fi model only)DS-BAST421C-AA0 Data Sheet – BASstat 421C 3 Wiring Diagram Dimensions (all dimensions are in mm) Wiring: 14 to 22 AWG wires or 1.5mm 2 wires. Mounts directly onto wall, panel, standard 65×65mm junction box (hole pitch 60 mm) or standard 2×4-inch vertical junction box (hole pitch 83.5mm). EIA-485 connection to pins 16(D+) and 17(D-) applicable to B2 - BACnet MS/TP model only. BW2 model uses Wi-Fi connectivity MODE SET + – 118 mm 94 mm 118 mm 34 mm Width: 94mm Height: 118mm Depth: 34mm 83.5 mm 6 mm 4 mm 60 mm 1 2 3 4 5 6 7 8 9 R C G NTC 3KΩ RS ESI 10 11 12 13 14 15 16 17 18 24VAC TT EIA-485 D+ D-DS-BAST421C-AA0 Data Sheet – BASstat 421C 4 Specifications Functional B2 model BW2 model Compliance EIA-485 IEEE 802.11b, 802.11g, 802.11n (single stream) 16.5dBm@11b, 14.5dBm@11g 13.5dBm@11n Frequency range: 2400MHz~2484MHz Protocols supported BACnet MS/TP BACnet/IP Cable length 4000 ft/1200 m N/A @76.8kbps (max) Wi-Fi range N/A 150ft. as defined by the standard (depending on obstructions) 54Mbps max data rate Authentication N/A WEP, WPA/WPA2 PSK Maximum Number of Devices 32 MS/TP devices (max) N/A or depending on Wi-Fi router performance Temperature Display Range -30 to 120.0°C (-22 to 248°F) -30 to 120.0°C (-22 to 248°F) with suitable sensor with suitable sensor Temperature Display Resolution 0.1°F (0.1°C) 0.1°F (0.1°C) Temperature Accuracy ±1.8°F (±1.0°C) with all ±1.8°F (±1.0°C) with all outputs off outputs off Electrical Input AC only AC only Voltage (V, ± 10%) 24 VAC 24 VAC Power 5 VA Frequency 47–63 H 5 VA Frequency 47–63 Hz 47–63 Hz Environmental/Mechanical Operating temperature 0°C to +50°C (32 to 122°F) 0°C to +50°C (32 to 122°F) Storage temperature −10°C to +60°C (14 to 140°F) −10°C to +60°C (14 to 140°F) Relative humidity 5–95%, noncondensing 5–95%, noncondensing Protection IP30 IP30 Weight 0.44 lbs. (.2 kg) 0.44 lbs. (.2 kg) Regulatory Compliance CE Mark; RoHS BW2 model Wi-Fi FCCID P53-EMW3165-PDS-BAST421C-AA0 Data Sheet – BASstat 421C October, 2021 www.ccontrols.com Electromagnetic Compatibility Model Description BAST-421C-B2 BACnet MS/TP FCU 4-pipe, single-speed Fan, Wired BAST-421C-BW2 BACnet/IP FCU 4-pipe, single-speed Fan, Wi-Fi Ordering Information The BASstat complies with the following specifications and bears the CE mark in accordance with the provisions of the Electromagnetic Compatibility (EMC) Directive 2004/108/EC based on the following specifications: StandardTest MethodDescription EN 61000-6-2IEC 61000-4-2Electrostatic Discharge Immunity EN 61000-6-2IEC 61000-4-3Radiated, Radio-Frequency, Electromagnetic Field Immunity EN 61000-6-2IEC 61000-4-4Electrical Fast Transit/Burst Immunity EN 61000-6-2IEC 61000-4-5Voltage Surge Immunity EN 61000-6-2IEC 61000-4-6Immunity to Conducted Disturbances EN 61000-6-2IEC 61000-4-8Power Frequency Magnetic Field Immunity EN 61000-6-2IEC 61000-4-11Voltage Dips and Interruptions EN 61000-6-3IEC 61000-3-2Limits for Harmonic Current Emissions EN 61000-6-3IEC 61000-3-3Limitation of Voltage Fluctuations and Flicker in Low Voltage Supply SystemsNext >