tekmar 077 User Manual

- Data Brochure
D 077
Indoor Sensor 077
The tekmar Indoor Sensor 077 includes a 10 kΩ thermistor mounted on a white enamel steel plate to provide an accurate measurement of the indoor temperature. The 077 can be mounted flush onto a standard duplex electrical box. Wiring enters from the back. The 077 can be connected to a 10k Room Temperature Unit (RTU) for remote temperature sensing.
05/07
Installation - Indoor Sensor 077
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 077 includes: •• One Indoor Sensor 077 •• One Data Brochure D 077 •• Two 6-32 x 3/4” screws •• Two 6-32 x 1/2” screws
STEP TWO
Remove the two front screws from the face plate and pull the support plate from the back of the sensor. Ensure the support plate screws do not fall off as the support plate is removed.
STEP THREE
• The Indoor Sensor should be installed on an interior wall of the desired zone to be controlled. Do not mount the 077 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.
MOUNTING THE SENSOR
REMOVING THE FRONT COVER
MOUNTING THE SUPPORT PLATE
• Mount the support plate to the electrical box using the two support plate screws provided.
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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 in this brochure and connect the wires to the control.
WIRING THE INDOOR SENSOR
STEP FIVE
Place any extra sensor wire into the electrical box. Secure the front plate of the Indoor Sensor 077 to the support plate using the two front screws. Ensure the wiring is not pinched or crushed when replacing the front plate.
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.
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