
WT-5220U-IT www.lacrossetechnology.com/support Page | 1
Model: WS-5220U-IT
Instruction Manual
DC: 082415
Atomic Projection Alarm
with Indoor and Outdoor Temperature
Indoor Temp.,
Outdoor Temp.
TX37U-IT
Sensor
2 -AA
batteries
Battery
Compartment
3-AA batteries

WT-5220U-IT www.lacrossetechnology.com/support Page | 2
This clock has time zones
North American time zones:
Get Started
Step 1: Insert 2 fresh AA, Alkaline batteries into the TX37U-IT
sensor according to polarity markings.
Step 2: Insert the 6 volt AC power cord into the wall, then into
the back of the alarm clock.
Step 3: Insert 3 fresh AA, Alkaline batteries into the projection
clock according to polarity (optional).
Restart: If the outdoor temperature is not displayed after 3
minutes, remove batteries from the projection clock and
outdoor sensor. Press any button on the projection clock 20
times. After 15 minutes, return to Step 1 above.
Set Time, Date, 12/24 Hour, Temperature Units
1. Hold the MODE/MIN button to enter time set mode
2. Press the SNOOZE button to confirm adjustments and
move to next item.
3. Press the AL/HOUR or MODE/MIN button to adjust
values.
Note:
When setting time (hours and minutes flash together):
o Use the AL/HOUR button to set the hour.
o Use the MODE/MIN button to set the minutes.
When setting the calendar (month and date flash together):
o Use the AL/HOUR button to set the month.
o Use the MODE/MIN button to set the date.
Setting order:
1. Time Zone
2. Hour & Minutes (together)
3. Year
4. Month/Date (together)
5. 12/24 Hour Format
6. Fahrenheit/Celsius
7. Daylight Saving Time ON/OFF
Press SNOOZE to exit, or wait 30 seconds without pressing
buttons to return to the normal time display.