4 LTBT-TM-MSET2
Microset™ II—Installation and Operations Guide
Introduction
The Microset
™
II is a wall-mounted sensor for BACtalk
®
VLCs
1
. Depending on the VLC version, the Microset II may be
interchangeable with previous version BACtalk Microsets. See
“Compatibility with Earlier Version VLCs” on p. 8 for details.
The Microset II has a backlit liquid crystal display (LCD) and
intuitive button operation. It connects to a VLC using three low
voltage wires. The Microset II exchanges data and receives
commands from a VLC using a range of AV and BV data
points in the VLC that are reserved for Microset operation.
These data points are available from the VLC as BACnet
objects.
Features:
Outside temperature displayed at all times
Space (room) temperature displayed at all times
Optional outside and room humidity display
Fan speed display/adjustment (up to three speeds and
OFF)
Setpoint display/adjustment
After-hours/housekeeping overrides
Optional time of day display
Heating or cooling mode display
English or metric units
Specifications
1. The Microset II is not compatible with the Alerton TUX product line.
Table 1 BACtalk Microset II specifications.
Thermistor
Type
Resistance
Interchangeability
Time Constant
a
Stability
a
Accuracy
a
a. Based on normal operating conditions.
The thermistor is integrated with the device. The unit is a microprocessor-based sensor with a built-in analog to digital
converter for temperature and humidity, which is designed to communicate directly to VLCs.
Uni-curve Type II.
10K
Ω at 77°F (22°C).
0.36°F (0.2°C).
10 seconds (to 66% of new temperature).
0.036°F (0.02°C) drift per year.
±0.36°F (0.2°C) over range of 32–158°F (0–70°C).
Power 24 VAC/VDC @ 25mA for backlit display. Orange lead terminates to 24 VAC or 24 VDC terminal on VLC. Sensor draws
5 VDC @ 10 mA from VLC.
VLC Connection 18 AWG, shielded, 3-conductor, 250 ft. max. Black wire to VLC IN, white to VLC input COM, orange is optional 24 VAC
for backlit display. Low capacitance wire recommended.
Dimensions 4.6" (117 mm) H X 3.0" (76 mm) L X 0.7" (18 mm) D.
Optional Humidity Sensor
Total Accuracy
Operating Temp.
Repeatability
Interchangeability
±2% RH, 0–100% RH @ 25°C, with saturated salt calibration.
-40–185°F (-40–85°C).
±0.5% RH.
±5% RH up to 60%RH, ±8% RH at 90% RH (typical humidity).
Ratings Listed Underwriters Laboratory as an accessory for VAVs and VLCs.
EMC Directive 89/336/EEC (European CE Mark). Pending.
FCC Part 15, Subpart J, Class A. Pending.
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