Ambient Weather WS-23 Owner's manual

Ambient Weather WS-23 Owner's manual
Ambient Weather WS-23 Wireless Indoor/Outdoor
8-Channel Thermo-Hygrometer with Backlit Display User
Manual
Table of Contents
1
2
Introduction ..................................................................................................................................... 2
Getting Started ................................................................................................................................ 2
2.1
Parts List................................................................................................................................. 2
2.2
Recommend Tools .................................................................................................................. 2
2.3 Thermo-Hygrometer Sensor Set Up.............................................................................................. 2
2.4 Display Console Set Up ................................................................................................................ 4
2.4.1 Display Console Layout ......................................................................................................... 5
2.4.2 Sensor Operation Verification ................................................................................................ 6
3 Remote Sensor Installation ............................................................................................................. 6
4 Console Operation........................................................................................................................... 7
4.1 Min/Max Mode ............................................................................................................................. 7
4.2
Clearing Min/Max Daily ........................................................................................................ 7
4.3 Outdoor Channel Selection and Scroll Mode................................................................................ 8
4.4 Temperature Units of Measure ...................................................................................................... 8
4.5 Sensor Search Mode and Resyncing the Sensors .......................................................................... 8
4.6 Best Practices for Wireless Communication ................................................................................. 8
4.7 Backlight Operation ...................................................................................................................... 9
4.7.1 Backlight Operation, Battery Power .................................................................................. 9
4.7.2 Backlight Operation, AC Power (optional) ........................................................................ 9
4.8 Adjustment or Calibration ............................................................................................................. 9
4.8.1 Indoor Temperature and Humidity Calibration ...................................................................... 9
4.8.2 Outdoor Temperature and Humidity Calibration ................................................................. 10
5 Glossary of Terms ......................................................................................................................... 11
6 Specifications ................................................................................................................................ 11
6.1 Wireless Specifications ............................................................................................................... 11
6.2 Measurement Specifications ....................................................................................................... 11
6.3 Power Consumption .................................................................................................................... 11
7 Troubleshooting Guide.................................................................................................................. 11
8 Accessories ................................................................................................................................... 13
9 Liability Disclaimer ...................................................................................................................... 13
10
FCC Statement.......................................................................................................................... 14
11
Warranty Information ............................................................................................................... 14
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Page 1
1 Introduction
Thank you for your purchase of the Ambient Weather WS-23 Wireless Indoor/Outdoor 8-Channel
Thermo-Hygrometer with Backlit Display. The following user guide provides step by step instructions
for installation, operation and troubleshooting. To download the latest manual and additional
troubleshooting tips, please visit:
http://ambientweather.wikispaces.com/ws23
2 Getting Started
Note: The power up sequence must be performed in the order shown in this section (insert
batteries in the remote transmitter(s) first, Display Console second).
The WS-23 weather station consists of a display console (receiver), and a thermo-hygrometer (remote
transmitter).
2.1 Parts List
QTY
1
1
1
Item
Display Console
Frame Dimensions (LxHxW): 6 x 3.25 x 1 in
LCD Dimensions (LxW): 4.5 x 2.5"
LCD Segment Height: 1 inch
Thermo-hygrometer transmitter (FT007TH)
Dimensions (LxHxW): 4.5” x 2.0” x 0.75”
User Manual
2.2 Recommend Tools
Hammer and nail for hanging remote thermo-hygrometer transmitter.
2.3 Thermo-Hygrometer Sensor Set Up
Note: Do not use rechargeable batteries. They tend to have a lower operating voltage, do not have
a wide temperature range, and do not last as long as non-rechargeable batteries.
We recommend fresh alkaline batteries for outdoor temperature ranges between -4 °F and 140 °F and
fresh lithium batteries for outdoor temperature ranges between -40 °F and 140 °F.
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1. Remove the battery door on the back of the sensor by removing the set screw, as shown in
Figure 1 .
Figure 1
2. BEFORE inserting the batteries, locate the dip switches on the inside cover of the lid of the
transmitter.
Figure 2 displays all four switches in the OFF position (factory default setting).
Figure 2
3. Channel Number: The WS-23 supports up to eight transmitters. To set each channel number
(the default is Channel 1), change Dip Switches 1, 2 and 3, as referenced in Table 1.
4. Temperature Units of Measure: To change the transmitter display units of measure (°F
vs. °C), change Dip Switch 4, as referenced in Table 1.
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1
DOWN
DOWN
DOWN
DOWN
UP
UP
UP
UP
-----
DIP SWITCH
2
3
DOWN
DOWN
DOWN
UP
UP
DOWN
UP
UP
DOWN
DOWN
DOWN
UP
UP
DOWN
UP
UP
---------
FUNCTION
4
----------------DOWN
UP
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
°F
°C
Table 1
5. Insert two AAA batteries.
6. After inserting the batteries, the remote sensor LED indicator will light for 4 seconds, and
then flash once per 60 seconds thereafter. Each time it flashes, the sensor is transmitting data.
7. Verify the correct channel number (CH) and temperature units of measure (°F vs. °C) are on
the display, as shown in Figure 3.
Figure 3
(1) temperature
(2) temperature units (°F vs. °C)
(3) channel number
(4) relative humidity
8. Close the battery door. Make sure the gasket (around the battery compartment) is properly
seated in its trace prior to closing the door. Tighten the set screw.
2.4 Display Console Set Up
1. Move the remote thermo-hygrometer(s) about 5 to 10’ away from the display console (if the
sensor is too close, it may not be received by the display console). If you have more than one
thermo-hygrometer, make sure they are all powered up and transmitting on different channels.
2. Remove the battery door on the back of the display, as shown in Figure 4. Insert four AAA
(alkaline or lithium, avoid rechargeable) batteries in the back of the display console.
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Figure 4
All of the LCD segments will light up for a few seconds to verify all segments are operating properly.
3. Replace the battery door, and fold out the desk stand and place the console in the upright
position.
The console will instantly display indoor temperature and humidity. The remote
temperature and humidity will update on the display within a few minutes on the appropriate
channel.
While in the search mode, the remote search icon
the channel number.
will be constantly displayed next to
If you have more than once remote sensor (up to eight remotes are supported), the display
will automatically toggle between sensors until all sensors have reported in.
Do not touch any buttons until the remote sensor has reported in, or the radio search icon
is no longer on, otherwise the remote sensor search mode will be terminated. When the
remote sensor temperature and humidity has been received, the console will automatically
switch to the normal mode, and all further settings can be performed.
If the remote does not update, please reference the troubleshooting guide in Section 7.
2.4.1 Display Console Layout
Note: The following illustration shows the full segments of the LCD for description purposes
only and will not appear like this during normal operation.
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Figure 5
1. Channel 1,2,3,4,5,6,7,8, indictor
2. Scroll mode (CH 1-8)
3. Transmitter low battery indicator
4. Min/Max Record mode
5. Min/Max reset for 24h
6. Indoor Relative Humidity (%)
7. Indoor Temperature
8. Outdoor Relative Humidity (%)
9. Outdoor Temperature
10. Temperature units of measure (°F or °C)
2.4.2 Sensor Operation Verification
Verify the indoor and outdoor humidity match closely with the console and sensor array in the same
location (about 5 to 10’ apart). The sensors should be within 10% (the accuracy is ± 5%). Allow
about 30 minutes for both sensors to stabilize. The humidity can be adjusted or calibrated later to
match each other a known source.
Verify the indoor and outdoor temperature match closely with the console and sensor array in the same
location (about 5 to 10’ apart). The sensors should be within 2°F (the accuracy is ± 1°F). Allow
about 30 minutes for both sensors to stabilize. The temperature can be adjusted or calibrated later to
match each other or a known source.
3 Remote Sensor Installation
It is recommended you mount the remote sensor on a north facing wall, in a shaded area. Direct
sunlight and radiant heat sources will result in inaccurate temperature readings. Although the sensor is
water resistant, it is best to mount in a well protected area, such as under an eve. Use a screw or nail
(not included) to affix the remote sensor to the wall, as shown in Figure 6.
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Figure 6
4 Console Operation
Note: The console has four buttons for easy operation: MIN/MAX/- button, CLEAR/ADJUST
button, CHANNEL/+ button and LIGHT button.
4.1 Min/Max Mode
The Min/Max mode displays the minimum and maximum temperature and humidity (since reset of the
unit) for the indoor, remote channel 1 through 8 sensors.
Prior to entering the MIN/MAX mode, press the CHANNEL/+ button to select the temperature and
humidity values you wish to view.
1. Display Maximum. Press the MIN/MAX button once to display the maximum. The MAX
icon will be displayed.
2. Clear Maximum. To reset the maximum values to the current values, press and hold the
CLEAR button for 3 seconds.
3. Display Minimum. Press the MIN/MAX button again to display the minimum. The MIN
icon will be displayed.
4. Clear Minimum. To reset the minimum values to the current values, press and hold the
CLEAR button for 3 seconds.
To return to normal mode, press the MIN/MAX button again.
4.2 Clearing Min/Max Daily
The minimum and maximum can be set to clear every 24 hours automatically. Press and hold the
CLEAR/ADJUST button for 3 seconds to switch between Clears 24h and Clears Manually.
When you manually clear the minimum and maximum, the Clears 24h function will clear every 24
hours from the time you clear it.
For example, if you clear the min and max at 4:00pm, it will continue to clear every day at 4:00pm.
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4.3 Outdoor Channel Selection and Scroll Mode
Press the CHANNEL/+ button to switch the display between remote sensors 1 through 8, and scroll
mode
. In scroll mode, all of the remote sensors will be displayed in five second intervals.
4.4 Temperature Units of Measure
The default temperature units of measure are degrees Fahrenheit. To toggle between degrees Celsius
and degrees Fahrenheit, press and hold the MIN/MAX button for 3 seconds.
4.5 Sensor Search Mode and Resyncing the Sensors
If any of the sensor communication is lost, dashes (--.-) will be displayed on the screen. To reacquire
the signal:
1. If a specific channel is lost, press the CHANNEL/+ button to display this channel, then Press
and hold the CHANNEL/+ button for 3 seconds, and the remote search icon
will be
constantly displayed for up to 10 minutes. Once the signal is reacquired, the remote search
icon
will turn off, and the current values will be displayed.
2. If new sensors are added, subtracted, or multiple sensor channels are lost, Press and hold the
CHANNEL/+ button for 5 seconds, and the remote search icon
will be constantly
displayed for up to 10 minutes. Once the signal is reacquired, the remote search icon
will turn off, and the current values will be displayed.
4.6 Best Practices for Wireless Communication
Note: To insure proper communication, mount the remote sensor on a vertical surface, such as a
wall. Do not lay the sensor flat.
Wireless communication is susceptible to interference, distance, walls and metal barriers. We
recommend the following best practices for trouble free wireless communication.
1. Electro-Magnetic Interference (EMI). Keep the console several feet away from computer
monitors and TVs.
2. Radio Frequency Interference (RFI). If you have other 433 MHz devices and
communication is intermittent, try turning off these other devices for troubleshooting
purposes. You may need to relocate the transmitters or receivers to avoid intermittent
communication.
3. Line of Sight Rating. This device is rated at 300 feet line of sight (no interference, barriers or
walls) but typically you will get 100 feet maximum under most real-world installations,
which include passing through barriers or walls.
4. Metal Barriers. Radio frequency will not pass through metal barriers such as aluminum
siding. If you have metal siding, align the remote and console through a window to get a clear
line of sight.
The following is a table of reception loss vs. the transmission medium. Each “wall” or obstruction
decreases the transmission range by the factor shown below.
Medium
Glass (untreated)
Plastics
Wood
Brick
Concrete
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RF Signal Strength Reduction
5-15%
10-15%
10-40%
10-40%
40-80%
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Metal
90-100%
4.7 Backlight Operation
The backlight operation is different when operating on batteries to save power.
4.7.1 Backlight Operation, Battery Power
To temporarily turn on the back light for five seconds, press the LIGHT button on the top of the
console.
To turn on the backlight for 30 minutes, press and hold the LIGHT button on the top of the console
for two seconds.
To turn off the backlight at any time, press and hold the LIGHT button for two seconds.
4.7.2 Backlight Operation, AC Power (optional)
The AC power plug is optional.
To temporarily turn on the back light for five seconds, press the LIGHT button on the top of the
console.
To turn on the backlight permanently, press and hold the LIGHT button on the top of the console for
two seconds.
To turn off the backlight at any time, press and hold the LIGHT button for two seconds.
Note: When AC power plug in, the backlight will turn on permanently.
4.8 Adjustment or Calibration
Note: The calibrated value can only be adjusted on the console. The remote sensor(s) always
displays the un-calibrated or measured value.
Note: The measured humidity range is between 10 and 99%. Humidity cannot be accurately
measured outside of this range. Thus, the humidity cannot be calibrated below 10% or above 99%.
The purpose of calibration is to fine tune or correct for any sensor error associated with the devices
margin of error. The measurement can be adjusted from the console to calibrate to a known source.
Calibration is only useful if you have a known calibrated source you can compare it against, and is
optional. This section discusses practices, procedures and sources for sensor calibration to reduce
manufacturing and degradation errors. Do not compare your readings obtained from sources such as
the internet, radio, television or newspapers. They are in a different location and typically update once
per hour.
The purpose of your weather station is to measure conditions of your surroundings, which vary
significantly from location to location.
4.8.1 Indoor Temperature and Humidity Calibration
Press and hold the ADJUST and MIN/MAX buttons at the same time for 5 seconds and the indoor
temperature value will begin flashing. Press the CHANNEL/+ button to increase the temperature and
the MIN/MAX/- button to decrease the temperature reading in 0.1° increments. To rapidly increase
(or decrease) the temperature reading, press and hold the CHANNEL/+ or MIN/MAX/- button.
To return the temperature to the actual or uncalibrated measurement, press the ADJUST button.
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Press and hold the ADJUST and MIN/MAX buttons at the same time for 5 seconds again, and the
indoor humidity value will begin flashing. Press the CHANNEL/+ button to increase the humidity
and the MIN/MAX/- button to decrease the humidity reading in 1% increments. To rapidly increase
(or decrease) the humidity reading, press and hold the CHANNEL/+ or MIN/MAX/- button.
To return the humidity to the actual or uncalibrated measurement, press the ADJUST button.
Once the displayed temperature or humidity equals the calibrated source, press and hold the ADJUST
button for three seconds, or wait 15 seconds for timeout, and the indoor temperature or humidity value
will stop flashing.
4.8.2 Outdoor Temperature and Humidity Calibration
Prior to entering the calibration mode, press the CHANNEL/+ button to select the outdoor
temperature and humidity you wish to adjust.
Press and hold the ADJUST and CHANNEL/+ buttons at the same time for 5 seconds and the
outdoor temperature value will begin flashing. Press the CHANNEL/+ button to increase the
temperature and the MIN/MAX/- button to decrease the temperature reading in 0.1° increments. To
rapidly increase (or decrease) the temperature reading, press and hold the CHANNEL/+ or
MIN/MAX/- button.
To return the temperature to the actual or uncalibrated measurement, press the ADJUST button.
Press and hold the ADJUST and CHANNEL/+ buttons at the same time for 5 seconds again, and the
outdoor humidity value will begin flashing. Press the CHANNEL/+ button to increase the humidity
and the MIN/MAX/- button to decrease the humidity reading in 1% increments. To rapidly increase
(or decrease) the humidity reading, press and hold the CHANNEL/+ or MIN/MAX/- button.
To return the humidity to the actual or uncalibrated measurement, press the ADJUST button.
Once the displayed temperature or humidity equals the calibrated source, press and hold the ADJUST
button for three seconds, or wait 15 seconds for timeout, and the outdoor temperature or humidity
value will stop flashing.
Discussion: Humidity is a difficult parameter to measure electronically and drifts over time due to
contamination. In addition, location has an adverse affect on humidity readings (installation over dirt
vs. lawn for example).
Official stations recalibrate or replace humidity sensors on a yearly basis. Due to manufacturing
tolerances, the humidity is accurate to ± 5%. To improve this accuracy, the indoor and outdoor
humidity can be calibrated using an accurate source, such as a sling psychrometer:
http://www.ambientweather.com/mafaredspslp.html
or one step humidpak calibration kits (reference Section 8). You can also use common table salt,
water and a plastic bag:
http://ambientweather.wikispaces.com/ws23
Discussion: Temperature errors can occur when a sensor is placed too close to a heat source (such
as a building structure, the ground or trees).
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To calibrate temperature, we recommend a mercury or red spirit (fluid) thermometer. Bi-metal (dial)
and other digital thermometers are not a good source and have their own margin of error. Using a local
weather station in your area is also a poor source due to changes in location, timing (airport weather
stations are only updated once per hour) and possible calibration errors (many official weather stations
are not properly installed and calibrated).
Place the sensor in a shaded, controlled environment next to the fluid thermometer, and allow the
sensor to stabilize for 48 hours. Compare this temperature to the fluid thermometer and adjust the
console to match the fluid thermometer.
5 Glossary of Terms
Term
Definition
Accuracy is defined as the ability of a measurement to match the actual
value of the quantity being measured.
A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of water
vapor that exists in air.
Range is defined as the amount or extent a value can be measured.
Accuracy
Hygrometer
Range
6 Specifications
6.1 Wireless Specifications



Line of sight wireless transmission (in open air): 300 feet, 100 feet under most conditions.
Frequency: 433 MHz
Update Rate: 60 seconds
6.2 Measurement Specifications
The following table provides specifications for the measured parameters.
Measurement
Indoor Temperature
Outdoor Temperature
Indoor Humidity
Range
32 to 140 °F
-40 to 140 °F
10 to 99 %
Outdoor Humidity
10 to 99%
Accuracy
± 1 °F
± 1 °F
± 5% (only guaranteed
between 20 to 90%)
± 5% (only guaranteed
between 20 to 90%)
Resolution
0.1 °F
0.1 °F
1%
1%
6.3 Power Consumption



Base station (display console) : 4 x AAA 1.5V Alkaline or Lithium batteries (not included)
Remote sensor : 2 x AAA 1.5V Alkaline or Lithium batteries (not included)
Battery life: Minimum 12 months for base station with one sensor and excellent reception.
Intermittent reception and multiple sensors may reduce the battery life.
Minimum 12 months for thermometer-hygrometer sensor (use lithium batteries in cold
weather climates less than -4 °F)
7 Troubleshooting Guide
If your question is not answered here, you can contact us as follows:
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1. Email Support: [email protected]
2. Technical Support: 480-346-3398 (M-F 8am to 3pm Arizona Time)
Problem
Wireless remote (thermo-hygrometer) not
reporting in to console.
There are dashes (--.-) on the display
console.
Solution
If any of the sensor communication is lost, dashes (--.-)
will be displayed on the screen. To reacquire the signal,
press and hold the CHANNEL/+ button for 3 seconds,
and the remote search icon
will be constantly
displayed. Once the signal is reacquired, the remote
search icon
will turn off, and the current values
will be displayed.
The maximum line of sight communication range is 300’
and 100’ under most conditions. Move the sensor
assembly closer to the display console.
If the sensor assembly is too close (less than 5’), move
the sensor assembly away from the display console.
Make sure the remote sensor LCD display is working
and the transmitter light is flashing once per 60 seconds.
Install a fresh set of batteries in the remote
thermo-hygrometer. For cold weather environments,
install lithium batteries.
Make sure the remote sensors are not transmitting
through solid metal (acts as an RF shield), or earth
barrier (down a hill).
Move the display console around electrical noise
generating devices, such as computers, TVs and other
wireless transmitters or receivers.
Temperature sensor reads too high in the
day time.
Indoor and Outdoor Temperature do not
agree
Indoor and Outdoor Humidity do not
agree
Version 1.0
Move the remote sensor to a higher location. Move the
remote sensor to a closer location.
Make sure the thermo-hygrometer is mounted in a
shaded area on the north facing wall. Consider the
following radiation shield if this is not possible:
http://www.ambientweather.com/amwesrpatean.html
Allow up to one hour for the sensors to stabilize due to
signal filtering. The indoor and outdoor temperature
sensors should agree within 2 °F (the sensor accuracy is
± 1 °F).
Use the calibration feature to match the indoor and
outdoor temperature to a known source.
Allow up to one hour for the sensors to stabilize due to
signal filtering. The indoor and outdoor humidity sensors
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Problem
Solution
should agree within 10 % (the sensor accuracy is ± 5 %).
Display console contrast is weak
Use the calibration feature to match the indoor and
outdoor humidity to a known source.
Replace console batteries with a fresh set of batteries.
8 Accessories
The following software and hardware accessories are available for this weather station at
www.AmbientWeather.com .
Accessory
Ambient Weather F007TH
Wireless
Thermo-Hygrometer for
WS-23 Weather Stations
Ambient Weather WS-23-C
WS-23 Big Digit 8-Channel
Wireless
Thermo-Hygrometer,
Console Only
Energizer AAA Lithium
Battery (2-pack) - Batteries
for Long Life and Cold
Climates
Ambient Weather
SRS100LX Temperature
and Humidity Solar
Radiation Shield
Ambient Weather Humidity
Calibration Kits
Description
Add additional remote thermo-hygrometers. Supports up to eight
remote sensors.
Add as many display consoles as you like to your existing system to
display the remote sensor in different locations.
AAA lithium batteries for cold weather climates.
Solar Radiation Shield improves temperature accuracy for hot weather
climates. Remove the rain guard and install over thermo-hygrometer.
One step calibration kits for digital hygrometers use salt slurry formula
to accurately calibrate the indoor and outdoor hygrometers.
9 Liability Disclaimer
Please help in the preservation of the environment and return used batteries to an authorized depot.
The electrical and electronic wastes contain hazardous substances. Disposal of electronic waste in
wild country and/or in unauthorized grounds strongly damages the environment.
Reading the “User manual” is highly recommended. The manufacturer and supplier cannot accept any
responsibility for any incorrect readings and any consequences that occur should an inaccurate reading
take place.
This product is designed for use in the home only as indication of weather conditions. This product is
not to be used for medical purposes or for public information.
The specifications of this product may change without prior notice.
This product is not a toy. Keep out of the reach of children.
No part of this manual may be reproduced without written authorization of the manufacturer.
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Page 13
Ambient, LLC WILL NOT ASSUME LIABILITY FOR INCIDENTAL, CONSEQUENTIAL,
PUNITIVE, OR OTHER SIMILAR DAMAGES ASSOCIATED WITH THE OPERATION OR
MALFUNCTION OF THIS PRODUCT.
10 FCC Statement
Statement according to FCC part 15.19:
This device complies with part 15 of the FCC rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause
undesired operation.
Statement according to FCC part 15.21:
Modifications not expressly approved by this company could void the user's authority to operate the
equipment.
Statement according to FCC part 15.105:
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
11 Warranty Information
Ambient, LLC provides a 1-year limited warranty on this product against manufacturing defects in
materials and workmanship.
This limited warranty begins on the original date of purchase, is valid only on products purchased and
only to the original purchaser of this product. To receive warranty service, the purchaser must contact
Ambient, LLC for problem determination and service procedures.
Warranty service can only be performed by a Ambient, LLC. The original dated bill of sale must be
presented upon request as proof of purchase to Ambient, LLC.
Your Ambient, LLC warranty covers all defects in material and workmanship with the following
specified exceptions: (1) damage caused by accident, unreasonable use or neglect (lack of reasonable
and necessary maintenance); (2) damage resulting from failure to follow instructions contained in your
owner’s manual; (3) damage resulting from the performance of repairs or alterations by someone other
than an authorized Ambient, LLC authorized service center; (4) units used for other than home use (5)
applications and uses that this product was not intended (6) the products inability to receive a signal
due to any source of interference or metal obstructions and (7) extreme acts of nature, such as
lightning strikes or floods.
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Page 14
This warranty covers only actual defects within the product itself, and does not cover the cost of
installation or removal from a fixed installation, normal set-up or adjustments, claims based on
misrepresentation by the seller or performance variations resulting from installation-related
circumstances.
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