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Toro TWRS - page 1
W ireless Rain Sensor Series Rain Sensor , Model TWRS and Rain/Freeze Sensor , Model TWRFS User’ s Guide RainSensorAlpha7 3/10/2005 3:31 PM Page I ...
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Toro TWRS - page 2
i Introduction The T oro W ireless RainSensor system, model TWRS for rain sensing and TWRFS for rain and freeze sensing, is a powerful water conservation and management tool that connects your automatic irrigation system to actual environmental factors vital to the health and maintenance of your landscape. W ithout sensor input, the controller simp ...
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Toro TWRS - page 3
1 The wireless sensor system is comprised of a programmable, weather-resistant receiver module and a sensor module with built-in transmitter . The receiver installs next to the irrigation controller and connects to the controller ’ s 24 V ac power source and sensor input terminals (if equipped) or splices directly into the irrigation valve common ...
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Toro TWRS - page 4
Getting Started The wireless rain sensor system is designed for easy installation, setup and years of trouble-free operation. In most cases, the system components can be installed and fully operational within minutes. All you will need is a Phillips screwdriver and basic do-it-yourself skills. If you have problems with any portion of the installati ...
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Toro TWRS - page 5
3 The sensor is adjusted to the preferred rainfall activation level. The sensor is installed using the Quick Clip TM mounting bracket or pipe-mount adapter . The operating features are set to your preferences. A sensor installation site is chosen and the system is tested again to verify operation. Step 5 Step 4 Step 6 Step 3 RainSensorAlpha7 3/10/2 ...
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Toro TWRS - page 6
4 Receiver Module F eatures 1 – Setup Button – Accesses the sensor system operating features. 2 – Adjust Button – Scrolls through and selects settings within the system operating features. 3 – Mast Antenna – Adjusts easily for best signal reception. 4 – Digital Display – High-resolution LCD screen provides visual reference for senso ...
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Toro TWRS - page 7
Installing the Receiver Module Important: Installation of this product must comply with national and local building and electrical codes. For assistance, contact a professional irrigation system contractor in your area. The receiver module is suitable for either indoor or outdoor installation. Select a location next to the controller that provides ...
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Toro TWRS - page 8
6 Connecting the Receiver Wir es CA UTION: The receiver r equires continuous 24 V ac power f or operation. Connecting to 110 V ac or higher will result in irr eparable damage. Ensure power to the contr oller has been remo ved prior to connecting the r eceiver wires. The sensor system is designed to work with most makes and models of irrigation cont ...
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Toro TWRS - page 9
For a normally-open sensor , attach the Y ello w wire to the remaining sensor terminal. T ape back the Brown wire. See Figure 3. 4. Attach the Red wires to the 24 V ac terminals. Important Most controllers with sensor connections also provide a control switch to bypass sensor operation if necessary . Check the switch setting to make sure it is not ...
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Toro TWRS - page 10
Initial System T est Before installing the sensor module, test the sensor at close range to verify operation. Once this test has been completed satisfactorily , the sensor module can be installed. If a problem occurs during the test procedure, refer to “ T roubleshooting ” on page 22. 1. Apply power to the controller and check its operation to ...
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Toro TWRS - page 11
9 Sensor Module F eatures 1– Rain Threshold Adjustment – Adjusts the rain sensor to accumulate 1/8", 1/4", 1/2" or 3/4" (3mm, 6mm,12mm or 19mm) of rainfall before signaling the receiver to hold watering. (Factory default setting 1/4" (6mm). 2– Sensor T est Spindle – Pressed to manually activate the sensor for setup ...
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Toro TWRS - page 12
10 Installing the Sensor Module Choosing the right installation site for the sensor module is the key to getting the maximum benefit from your sensor system. Select a sensor installation site that provides the following conditions: • Unobstructed exposure to rainfall–away from overhangs, tree branches, etc. • Protected from irrigation spray , ...
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Toro TWRS - page 13
11 3. Adjust the Rain sensor to the preferred rainfall threshold activation point. The settings are indicated in 1/8", 1/4", 1/2" and 3/4" on one side of the cap, and 3mm, 6mm, 12mm and 19mm on the other . First, turn the cap to align the stationary pin with the vertical slot. Guide the cap to the preferred horizontal slot posit ...
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Toro TWRS - page 14
12 A pipe-mount adapter is provided to enable sensor installation on a secured section of 1/2" (13mm) diameter Schedule 40 PVC pipe. Note: Metal pipe or conduit may interfere with radio signal transmission and is not recommended. Remove and replace the Quick Clip bracket with the pipe-mount adapter . Ensure the friction washer is installed bet ...
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Toro TWRS - page 15
Freeze Sensor Site Selection In addition to the rain sensor site conditions listed on page 10, the following conditions are necessary to ensure optimum freeze sensor operation. For best results, the sensor should be: • Located in the coldest portion of the landscape. • A way from direct exposure to morning sunlight. • A way from any heat prod ...
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Toro TWRS - page 16
Set T emperature Activ ation Threshold (TWRFS models only) The freeze sensor temperature activation threshold is adjustable from 35°F to 45°F or 2°C to 7°C. When the air temperature reaches the threshold setting, the freeze sensor activates the receiver . The Freeze Sensor Status indicator will turn on. The sensor system will return to the Moni ...
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Toro TWRS - page 17
W ater Conser vation F eature – By simply choosing the Minimum, Medium or Maximum conservation level that corresponds to your landscape’ s soil type and the sensor location, a dry-out period, adjusted for actual rainfall duration, is inserted after the sensor system resets to delay the resumption of automatic watering. Each W ater Conservation ...
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Toro TWRS - page 18
Smart Bypass F eature Pressing the Smart Bypass button switches an active sensor system Off and places it in the Bypass mode. When the sensor is bypassed, the controller resumes automatic watering operations as scheduled. The Sensor Status indicator and the Bypass display prompt will flash to indicate when the sensor system is in the Bypass mode. S ...
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Toro TWRS - page 19
17 Signal Strength Display This feature displays sensor signal strength on a digital scale ranging from 0.0 to 10.2 1. Press the Setup button as needed to display the antenna icon and the digital readout. The display will indicate the strength of the last received signal. See Figure 22. Important: A signal strength value less than 2.0 is not reliab ...
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Toro TWRS - page 20
Dry Out F eature The Dry Out feature is provided to override the W ater Conservation baseline level, allowing the dry-out delay period to be set in 0.5-day increments from 0.5 to 4.0 days. Note: Before using the Dry Out feature, allow the sensor system to normalize by cycling through rain and/or freeze activation several times. 1. Press the Setup b ...
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Toro TWRS - page 21
Loss of communication If the sensor system does not communicate within a 24-hour period, it will remain in its current state (Active or Monitor). T o alert you to this condition, the Attention Required symbol will be displayed. The Antenna symbol and current air temperature (TWRFS only) will be flashing and the signal bar indicator will be cleared. ...
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Toro TWRS - page 22
T urn the Recei ver Module Off and On 1. T o turn the receiver module Off , press and hold the Adjust button until two dashes are displayed (approximately 5 seconds), then release. 2. T o turn the receiver On , press the Setup button two times . The receiver will return to the normal display mode within approximately 10 seconds. Set or Restore the ...
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Toro TWRS - page 23
Sensor Module Battery Replacement 1. Unscrew and remove the bottom cap from the sensor housing. 2. Grasping the edges of the circuit board assembly , carefully slide the circuit board assembly out of the housing. 3. Remove the battery cover and batteries. 4. Insert two new 3V CR2032 (or equivalent) batteries with the positive (+) side facing toward ...
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Toro TWRS - page 24
T roubleshooting If you encounter problems at any point in the installation process, or the components do not seem to function properly , try the Troubleshooting procedures first. If the problem is not listed or the remedy does not resolve the problem, call the T oro Irrigation help line at 1-800-664-4740. Solving Reception Problems The W ireless R ...
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Toro TWRS - page 25
The recei ver display is blank. • Check the 24 V ac power connections. The red power wires from the receiver must be connected to the controller ’ s 24 V ac power source. Make sure the power wires are not connected to the station or pump/master valve terminals. These terminals only provide 24 V ac power when the controller is operating the spri ...
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Toro TWRS - page 26
24 Specif ications Models: TWRS (W ireless RainSensor) and TWRFS (W ireless Rain/Freeze Sensor) W ireless Communication Range: 500' (152.4m) LOS (line-of site) Sensor T ype: Industry-standard hygroscopic disc stack with adjustable rainfall sensitivity Sensor Module Batteries: (2) 3V cells - CR2032 (or equivalent) A verage Battery Life: 5 years ...
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Toro TWRS - page 27
The T oro Pr omise – Five-year Limited W arranty The T oro Company and its affiliate, T oro W arranty Company , pursuant to an agreement between them, jointly warrants, to the owner , each new piece of equipment (featured in the current catalog at date of installation) against defects in material an d workmanship for for a period described below ...
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Toro TWRS - page 28
Electromagnetic Compatibility Domestic: This device complies with FCC rules Part 15. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference that may be received, including interference that may cause undesirable operation. This equipment generates and ...
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