Installation; Terminal Block Pin Assignments - Contemporary Controls BAST-221C User Manual

3 Installation

The BASstat is intended for surface-mount installation at eye-level on a wall, not subjected to
direct sunlight or direct air movement. The display (top half) can be removed from its base by
loosening the small Philips screw at the bottom of the display. There is no need to remove the
screw. Once the display is removed from the base, the base can be mounted onto the wall with
appropriate fasteners. The dimensions of the oval mounting holes are 4mm x 6mm allowing for
perfect fit adjustments. If a single-gang electrical junction box is to be used, the top and bottom
mounting holes will align with the screw holes in the junction box. Thanks to its EEPROM, the
BASstat will store its configuration in the event of power loss.

Terminal Block Pin Assignments

3.1
Two 9-pin terminal blocks provide for all field connections. Terminal markings for mechanical
equipment follow NEMA DC 3-2003 convention. For single-stage operation, connect Y wire to
Y1 and W wire to W1. BACnet MS/TP data communication connections can be found at
terminals 16 and 17 and are polarity sensitive. The BASstat (B2 MS/TP model) does not provide
End-of-Line termination. If the BASstat-B2 is the first or last device on the MS/TP bus, a
termination resistor (120Ω) must be applied across pins 16 and 17 of the input terminal. The
remote sensor input (RS) is at terminals 13 and 14. The BASstat is intended to be powered by a
Class 2 compliant power source and only accepts 24VAC.
Number Mark
1 R
2 C
3 Y1
4
5 Y2
6 W1
7 W2
8 G
9
UM-15090000-AA4
Comment
24 VAC high-side
24 VAC common
Cooling Stage 1
Cooling Stage 2
Heating Stage 1
Heating Stage 2
Fan
Number Mark
10
11
12
13 RS Remote Sensor Input
14 GND Ground
15
16 D+ BACnet MS/TP Data +
17 D- BACnet MS/TP Data -
18
Comment
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