UM-15093500-AA1
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1 Introduction
The BAST-421C-BW2 is a member of the BASstat BACnet Communicating Thermostat series.
It provides modulated heating and cooling control in an attractive wall-mounted enclosure with a
large LCD display. Intended for use with 4-pipe heated/chilled water Fan Coil units, the
thermostat can control 2 analog modulating water valve actuators and one binary supply fan.
This BASstat is BACnet compliant and BTL listed to ensure seamless integration, using
BACnet/IP over Wi-Fi and can be integrated into any 802.11 b/g/n Wi-Fi network. A large, easy
to read LCD display indicates setpoint, space temperature and current mode of operation using
graphical icons.
The BASstat has a built-
in space temperature sensor with provision for remote wired 3kΩ NTC
thermistor sensor or temperature value can be sent by another communicating device over the
BACnet network. The BASstat is configurable locally using the
Engineering Menu
or via a
network connection to a BACnet client. Contemporary Controls’ free
can be used for initial configuration of the thermostat over BACnet. Control algorithm
parameters such as deadband, proportional gain, integral rate and trip points are all
configurable. This BASstat also features configurable fan control and occupancy selection.
Operating states are indicated on the thermostat display.
The numerous features available in the BASstat can be configured by the systems integrator to
meet user requirements in two different ways. One way is using a button sequence on the
thermostat in order to enter the
Engineering Menu
- which requires physical access to the
thermostat. Optionally, the buttons could be locked to limit user access to
Engineering Menu
after installation is complete. The second method is configuring the thermostat over the BACnet
network using a BACnet client device or software such as Contemporary Controls’ free
NOTE
: 2-pipe HVAC systems and floating-type control valve actuators are not supported by this
device.