UM-15094500-AA0
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3
Installation
The BAST-321HP-BW2 is intended for surface-mount installation 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 terminal blocks are provided for all field connections. 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.
Number
Mark
Comment
Number
Mark
Comment
1
R
24 VAC high-side
10
2
C
24 VAC common
11
3
O/B
Reversing Valve
12
4
13
RS
Remote Sensor Input
5
Y1
Compressor 1
14
GND
Ground
6
Y2
Compressor2
15
ESI
Energy Saving Input
7
W
Stage 3 Heat
8
G
Fan
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. It should be powered by a
Class 2 power source complying with the requirements of the National Electric Code (NEC)
article 725. 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).