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070_D |
Outdoor Sensor 070 |
12/12 |
Accessories |
Replaces: 05/07 |
Installation & Operation Manual
The Outdoor Sensor 070 provides accurate measurement of the outdoor air temperature. Many controls and thermostats can connect to the 070 to measure and display the outdoor temperature.
Installation - Outdoor Sensor 070
STEP ONE |
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MOUNTING THE SENSOR |
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NOTE: The temperature sensor (thermistor) is built into the 070 enclosure.
•Remove the screw and pull the front cover off the sensor enclosure.
•The 070 can either be mounted directly onto a wall or a 2” x 4” electrical box. When the 070 is wall mounted, the wiring should enter through the back or bottom of the enclosure. Do not mount the 070 with the conduit knockout facing upwards as rain could enter the enclosure and damage the sensor.
•In order to prevent heat transmitted through the wall from affecting the sensor reading, it may be necessary to install an insulating barrier behind the enclosure.
•The 070 should be mounted on a wall which best represents the heat load on the building (a northern wall for most buildings and a southern facing wall for buildings with large south facing glass areas). The 070 should not be exposed to heat sources such as ventilation or window openings.
•The 070 should be installed at an elevation above the ground that will prevent accidental damage or tampering.
Sensor with rear |
Sensor with bottom |
Sensor mounted |
entry wiring |
entry wiring |
onto 2" x 4" |
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electrical box |
A Watts Water Technologies Company |
1 of 4 |
© 2012 |
070_D - 12/12 |
STEP TWO |
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WIRING AND TESTING THE SENSOR |
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•Connect 18 AWG or similar wire to the two terminals provided in the enclosure and run the wires from the 070 to the control. Do not run the wires parallel to telephone or power cables. If the sensor wires are located in an area with strong sources of electromagnetic interference (EMI), shielded cable or twisted pair should be used or the wires can be run in a grounded metal conduit. If using shielded cable, the shield wire should be connected to the Com terminal on the control and not to earth ground.
•Follow the sensor testing instruction in this brochure and connect the wires to the control.
•Replace the front cover of the sensor enclosure.
Wires from outdoor sensor to control’s outdoor sensor and sensor common terminals
Sensor is built into the enclosure
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.
A Watts Water Technologies Company |
2 of 4 |
© 2012 |
070_D - 12/12 |
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