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DT420

 dusk to dawn timer

OWNERS 
MANUAL

Congratulations on your 
purchase of a UPM outdoor 
timer.  Please take the time 
to read and understand this 
manual so you can begin to 
enjoy the security and 
energy saving benefits this 
product has to offer.

FEATURES

!

”ON” settings of 2, 4, 6, 
8 or 10 hours, or from 
dusk to dawn

!

Built-in adjustable 
photocell senses 
amount of ambient light 
and turns unit On or Off

!

Random function

!

Manual On/Off

!

LED Power On Indicator

!

15A, 1800W (resistive)

!

drip-proof cover design

TECHNICAL SPECIFICATIONS

Ratings:

120V AC, 15A

Max Load: 1800W resistive; 600W tungsten

Mode
Switch

Time Dial
Switch

Photocell

Photocell
Sensitivity
Adjustment

LED Indicator

OPERATION

1

2

Plug timer into wall socket

Turn the photocell adjustment 
left or right to adust the 
sensitivity level

This timer is triggered to turn On when it gets dark (the ambient light falls 
below a selected lighting threshold).  The two operating modes are AUTO 
and RANDOM.

adjusting photocell

1

2

AUTO MODE

1

Select the desired On-period (2, 4, 6, 8 
or 10 hours) using the dial switch

Set timer to turn and stay On for 2, 4, 6, 8, or 10 hours after dark.

Select AUTO using the slide switch

2

RANDOM MODE

Set timer to turn On and Off at random cycles after dark.

1

Select RANDOM using the slide switch

MANUAL ON/OFF

Use timer as a manual On/Off switch

1

Select On or Off using the slide switch

*Reminder: timer only operates when the ambient light is below 
the chosen lighting threshold.

*Reminder: timer only operates when the ambient light is below the 
chosen lighting threshold.

120V 15A

Plug

Select the period in which you want the random 
function to operate by using the dial switch (i.e. 
2, 4, 6, 8 or 10 hours, or CONTINUOUS)

2

1

1

2

CONTINUOUS

For continuous Dusk to Dawn operation:

3

Select CONTINUOUS using the dial switch

MOUNTING BRACKET

WARNING: To avoid shock hazard, timer must be installed vertically and at least 3 ft. 
above ground level.

1

1

For safe and optimal performance, use the supplied mounting bracket to hold the 
timer vertically and flush against the wall.  You will require your own tools and 
accessories (i.e. power drill, bits, screws, and/or screwdriver) for proper installation.

Once it turns dark, the timer will cycle On and Off randomly within the selected time period.

1

2 3

CONTINUOUS

CONTINUOUS

CONTINUOUS

CONTINUOUS

 

http://waterheatertimer.org/UPM-timers-and-manuals.html

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