Installation; Terminal Block Pin Assignments; Limited Power Source - Contemporary Controls BASstat BAST-221C-BW2 User Manual

3 Installation

The BASstat is intended for surface-mount installation at eye-level on an interior wall, away from
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. Once the display is removed from
the base, the base can be mounted onto the wall with appropriate fasteners. 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.
3.1

Terminal Block Pin Assignments

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. The remote sensor input (RS) is at terminals 13 and 14. The remote
occupancy (ESI) input is a dry contact closure input located at terminals 14 and 15. 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
3.2

Limited Power Source

The BASstat is intended to be powered by a Class 2 compliant power source and only accepts
24VAC with no more than 5VA of power consumption and should be powered by a Class 2 power
source complying with the requirements of the National Electric Code (NEC) article 725. The
power rating of a Class 2 power source is limited to 100 VA. The transformer or power supply
complying with the Class 2 rating must carry a corresponding listing from a regulatory agency
such as Underwriters Laboratories (UL).
UM-15090500-AA1
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 ESI Energy Saving Input
16
17
18
Comment
Page 11