Northern Tool 20236 Operating Instructions

Atomic Wall Clock Operating Instructions
The radio controlled mechanism in your clock tunes itself to the time signal broadcast by the official
U.S. Atomic Clock in Fort Collins, Colorado, also known as WWVB. The clock's time setting will
occur automatically soon after the battery is inserted. Please read these instructions carefully and
completely as you start to use your clock. Keep them in a safe location as you may want to refer to
them in the future.
FEATURES:
Super accurate radio controlled movement
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Large easy to read dial
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Sets itself automatically
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Daily time updates to maintain accuracy
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Selectable Time Zones: (Pacific/Mountain/Central/Eastern)
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Automatically adjusts to Daylight Savings Time
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STARTING THE CLOCK:
On the back of the clock select the appropriate Time Zone for your area by sliding the switch
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to position P, M, C, or E (P=Pacific Time; M=Mountain Time; C=Central Time; E=Eastern
Time.)
Insert one AA alkaline battery, 1.5V, (not included) into the battery compartment noting
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correct polarity markings in the case.
After inserting the battery, the second hand will move to the 12 o'clock position. Next the
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minute and hour hands will move to the 12 o'clock position. The clock will then search for
the radio signal.
If the signal is strong, within approximately three minutes the clock will set itself.
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If the signal is weak or the clock is unable to receive the signal the hands will not move. The
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clock will attempt to receive the signal once each hour for the next 4 hours. Due to
atmospheric conditions, signal reception is generally strongest from midnight to 4 AM.
After 24 hours, if there is still no signal, the hands will move but not to the correct time. This
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indicates there is no reception at this location and the clock should be moved to another
location in order to receive the signal.
Once the Atomic Clock sets itself, it will seek out the radio signal once daily to maintain
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accuracy.
MANUAL SETTING MODE:
· In some locations if the time signal is not able to be received by the clock there are 2 alternatives;
either move the clock to a different location where reception is possible, or set the time manually.
· To manually set the time, during normal run time press the M.SET button for 5 seconds to enter
Manual Setting Mode. Now you can set the time manually. Press the M.SET button once and
the minute hand jumps one minute per press of the button; alternatively hold down the M.SET
button continuously and release once the correct time has been reached. If you stop pressing
the M.SET button for over 7 seconds, Manual Setting Mode is turned off. (There are 2 M.SET
buttons on the back of your clock and you may use either one.)
TO FORCE CLOCK TO SEARCH FOR RADIO SIGNAL:
· During normal run time, press the REC button for 3 seconds. The hands stop moving and the
clock starts searching for the radio signal. (There are 2 REC buttons on the back of your clock
and you may use either one.)
· If reception is successful, the hands synchronize to the correct time. If reception failed, the clock
continues running to follow the memory time from previous received signal.