tekmar 076 User Manual

- Data Brochure

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D 076

Indoor Sensor 076

The tekmar Indoor Sensor 076 includes a 10kΩ thermistor which provides accurate
measurement of the indoor temperature. The 076 can be mounted directly on the wall using
two #6-1” screws. The small size of the 076 makes this sensor visually appealing and less
noticeable on the wall. The 076 can be connected to a 10k Room Temperature Unit (RTU)
for remote temperature sensing.

05/07

Installation - Indoor Sensor 076

STEP ONE

Check the contents of this package. If any of the contents listed are missing or damaged,
please contact your wholesaler or tekmar sales representative for assistance.

Type 076 includes:

STEP TWO

NOTE: The temperature sensor (thermistor) is built into the 076 enclosure.

To remove the 076 front cover, place a small screwdriver
or similar object into the small hole located in the top
of the 076 enclosure. Push the screwdriver against the
plastic flap and pull the top of the front cover so that it
pivots around the bottom edge of the mounting base.

GETTING READY

• One Indoor Sensor 076 •• One Data Brochure D 076

REMOVING THE FRONT COVER

Small slot for
screwdriver

Top View of Indoor Sensor

STEP THREE

• The Indoor Sensor should be installed on an interior
wall of the desired zone to be controlled. Do not
mount the 076 in a location that may be affected
by localized heat sources or cold drafts. It may be
necessary to install a draft barrier and / or insulation
behind the enclosure in order to prevent air from
blowing through the wiring hole and affecting the
Sensor reading.

• For surface mounting, mount the Indoor Sensor
directly to the wall using two #6-1” screws. The
screws are inserted through the mounting holes
and must be securely fastened to the wall. If
possible, at least one of the screws should enter
a wall stud.

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MOUNTING THE INDOOR SENSOR

STEP FOUR

Run two conductor 18 AWG or similar wire between the Indoor Sensor and the terminals
on the tekmar control. Insert the wires through the hole provided in the back of the indoor
sensor enclosure and connect them to the indoor sensor terminal block. Do not run the wires
parallel to telephone or power lines. If the indoor sensor wires are located in an area with
strong sources of electromagnetic noise, shielded cable or twisted pair should be used or
the wires can be run in a grounded metal conduit. If using shielded cable, one end of the
shield wire should be connected to the Com-Sen terminals on the control and the other end
should remain free. The shield must not be connected to earth ground. Follow the sensor
testing instructions below and connect the wires to the control.

WIRING THE INDOOR SENSOR

STEP FIVE

The Indoor Sensor 076 front cover is installed by aligning the hinges on the bottom of the
front cover with the bottom of the sensor mounting base. The front cover is then pivoted
around the bottom hinge and pushed against the mounting base until it snaps firmly into
place.

INSTALLING THE FRONT COVER

Sensor Testing Instructions

A good quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000Ω) is required to
measure the sensor resistance. In addition to this, the actual temperature must be measured
with either a good quality digital thermometer, or if a thermometer is not available, a second
sensor can be placed alongside the one to be tested and the readings compared.

First measure the temperature using the thermometer and then measure the resistance of
the sensor at the control. The wires from the sensor must not be connected to the control
while the test is performed. Using the chart on the following page, estimate the temperature
measured by the sensor. The sensor and thermometer readings should be close. If the test
meter reads a very high resistance, there may be a broken wire, a poor wiring connection
or a defective sensor. If the resistance is very low, the wiring may be shorted, there may be
moisture in the sensor or the sensor may be defective. To test for a defective sensor, measure
the resistance directly at the sensor location.

Do not apply voltage to a sensor at any time as damage to the sensor may result.

© 2007 D 076 - 05/07 2 of 4