Installation; Terminal Block Pin Assignments; Limited Power Source - Contemporary Controls BASstat Series 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 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 does not provide End-of-Line
termination. If the BASstat 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 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-15090000-AA8
Comment
24 VAC high-side
24 VAC common
Cooling Stage 1
Cooling Stage 2
Heating Stage 1
Heating Stage 2
Fan
Page 11
Number Mark
10
11
12
13 RS Remote Sensor Input
14 GND Ground
15 ESI Energy Saving Input
16 D+ BACnet MS/TP Data +
17 D- BACnet MS/TP Data -
18
Comment