t.a.c. STR Series User Manual

1 (2) 0-003-2307-1 (EN)
STR250
TECHNICAL DATA
Subject to modification.
Wall Module
24 Oct 2003
Ambient conditions:
Storage .......... -20 to +80 ºC (-4 to 176 ºF) max 90% RH
Operation .........0 to +50 ºC (32 to 122 ºF) max 90% RH
Mechanical
Enclosure rating........................................ IP20 / NEMA1
Enclosure material .................................PC/ABS plastic
Weight ........................................................ 85 g (0.19 lb)
Dimensions:
Please refer to figure overleaf
Standards:
EMC .......................................EN 50081-1, EN 50082-1
FCC part 15 class B
Safety Standard ................................. UL 916 (pending)
Flammability rating .........................................UL 94V-0
Wiring
Cable type ..................................Twisted pair, shielded
Maximum capacitance, conductor-conductor....... 30pF
Maximum capacitance, conductor-shield ............. 55pF
Cable size .............................. Min 0.25 mm
2
(24 AWG)
Distance ............................................. Max 30 m (100 ft)
The STR is a series of wall modules optimized for public
facilities such as office buildings, hotels, hospitals, schools
and shopping malls. Their pleasant appearance and well-
designed interface make them suitable for any
contemporary building. They are easy to operate and
install.
STR wall modules are designed to be mounted directly on
the wall or onto a variety of back-boxes/J-Boxes. The plug-
in concept makes wiring quick and easy.
Temp range/resolution .......................Controller-dependent
Temperature accuracy ................................ 0.6 ºC (1 ºF)
Sensor element .................................. 10kW Thermistor
Data communication
Serial Proprietary ............................STR250 - Controller
Power Requirements
+12V DC ................................... supplied from controller
Part number:
STR250 ........................................................ 0-046-0330
The STR250 replaces the I/STAT LCD with regard to major
functionality such as indoor and outdoor temperature
indication, setpoint adjustment, bypass mode and fan
speed commands.
The STR250 can be used with the 7728, MRs, and Xenta
102-AX controllers.

t.a.c. STR Series Specifications

General

Category	Thermostat
Display	LCD
Series	STR
Power Supply	24 VAC
Accuracy	±0.5°C
Mounting	Wall Mount

Summary

Technical Data and Specifications

Environmental and Mechanical Specs

Details ambient operating/storage conditions, enclosure, weight, and dimensions.

Electrical and Wiring Details

Covers wiring types, cable requirements, power supply, and product part number.

Performance and Standards Compliance

Outlines compliance standards, temperature performance, and sensor details.

Product Configuration and Installation

Local Configuration Method

Describes local configuration via an M/STAT module connected to the core panel.

Mounting Options

Details direct wall mounting or use with various back-boxes/J-boxes.

Wiring Installation

Explains the three-wire installation and easy accessibility via plug-in concept.

Physical Dimensions

Provides detailed physical dimensions of the STR250 wall module with diagrams.

User Interface Operations

Button Functions

Explains the functionality of the Bypass, Select, Increase, and Decrease buttons.

Temperature Control

Guides on adjusting room temperature setpoints and monitoring indoor/outdoor temps.

Fan Speed Adjustment

Describes how to adjust fan speed settings via the user interface.

Product Maintenance

Cleaning Instructions

States no specific maintenance is required, only cleaning with a soft cloth if necessary.