Kessler-Ellis Products DT20 User manual

99867 12/20/16
Description
The DT20 is a compact electronic 24 hour/7 day time switch module, with heavy duty relay contacts for
switching low or line voltage loads. Applicable for time of day control of pumps, fans, heaters, HVAC control
circuits, lighting, machinery and many other types of commercial, industrial, and agricultural equipment.
All models feature large keys with unique “circular programming” for easy programming, a large LCD dis-
play and battery backup.
Features
❑24 Hour (AM & PM), 7 Day Programming
❑3 Common Preset or Custom Timing Programs
❑20 Programs Provide Up To 10 ON & 10 OFF
Events Per Day / Weekl
❑Rechargeable Battery Backup With 100 Hour
Carry-Over
❑16 Amp, SPDT Relay
❑Manual Override Capability
❑Several Mounting Styles Available
❑Daylight Savings Key
Application
Time based control of lighting, ventilating, heating, cooling or other electrical loads in commercial and industrial
applications. The DT20 time switches are programmable for 24-hour or 7-day schedules. Mounting options are available
for surface or DIN rail mounting.. The control can be completely enclosed in a plastic housing with an optional terminal
cover and sub-base for installation and hard wiring. They are also available with a din rail mount within an enclosure for
stand-alone outdoor applications.
DT20
DT20
KESSLER-ELLIS PRODUCTS
10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-935-1320
Fax: [phone]
http://www.kep.com
Day Timer with 20 Programmable Presets
Installation and Operating Manual

Contents
Safety Precautions ..................................................................................................................1
Program Structure...................................................................................................................1
Symbol Keys ............................................................................................................................2
Setting The Timer ....................................................................................................................2
Setting The Clock, Time & Day...............................................................................................2
Preset Programs......................................................................................................................3
Using / Selecting Preset Programs P01 - P03.......................................................................3
Creating User Dened Programs ...........................................................................................4
Deleting Programs...................................................................................................................5
Summer/Winter Time (Daylight Saving Changes) ................................................................5
Automatic Operation / Override Operation ...........................................................................5
Mounting Options ...................................................................................................................6
Warranty ...................................................................................................................................7
Decoding Part Number............................................................................................................7
Additional Mounting Options - E200 Outdoor Enclosure ....................................................7
Apendix-A: Program Schedules Worksheet .........................................................................8

1
Set time: Format 24h or am/pm
24h blinking, using +/- to select, then OK
Set time: Hour
Hour blinking, using +/- to select, then OK
Set time: Minute
Minute blinking, using +/- to select, then OK
Set time: Day of Week
Monday blinking, using +/- to select Day, then OK
Set Program: P01 / P02 /
P03 or P--
Using +/- to select, then OK
to set ON/OFF times
or
press Menu to terminate
programming
P01-03, P--
Set switching times:
First free memory location
blinks.
Press ''-''to go back one
memory location.
Press OK for setting the
switching times
Prog01
Set switching times:
First free memory location
blinks.
Press OK for setting the
switching times
First installation setting Review/adjust
Menu
OKMenu
Note:
P01-03
are pre-set
Press Reset Button
Set switching ON time: Hour
Hour blinking, using +/- to select, then OK
Set switching ON time: Minute
Minutes blinking, using +/- to select, then OK
Set switching ON time: Days
Mo-Su blinking, using +/- to select, then OK
Set switching OFF time: Hour
Hour blinking, using +/- to select, then OK
Set switching OFF time: Minute
Minutes blinking, using +/- to select, then OK/Menu
A maximum of 20 memory locations
can be occupied
10 switching ON times
10 switching OFF times
Menu
RUN
P-- is user defined
i.e. Prog01
i.e. Prog02
Safety precautions
· The connection and installation of electrical devices may only be
carried out by a qualified electrician.
· Interventions in and changes to the device result in the voiding of
the warranty claim.
· Observe your national regulations and the respective safety
provisions.
· Switch-off commands have priority over switch-on commands.
Safety Precautions Program Structure

2
OK
reset
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
+- Menu OK
Res.
+1h
: Overview of daily switching program
: Setting of 24h or am/pm
: Summer/winter clock changes
: Weekday display
: Switching status display ON/OFF
: Pointer to Mode OVERRIDE/AUTO
+/- : Adjustment keys: By pressing the key longer than 2 sec. you
can adjust the timer in steps of 5 units
Res. : Reset
Menu : By pressing the menu key programming is terminated and
the system reverts to automatic operation
OK : Confirmation of programming
OVR AUTO
Menu
Prog
Setting of this programmable timer is depending of the user preference to
use pre-set programs or defining own programming.
Using Pre-set programs (first time installation)
Using
Reset key you can adjust the
following values:
24h or am/pm:
see pg 1
Time (hour and
minutes):
see pg 1
Week day:
see pg 1
Pre-set programs
P01 to P03:
see pg 1
User defined programming by Menu mode
Using
Menu key you can adjust /
review the following values:
24h or am/pm:
see pg 1
Time (hour and
minutes):
see pg 1
Week day:
see pg 1
Programs P--:
see pg 1
+ - Menu OK
Res.
+1h
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
OVR AUTO
Mode
Sequence to follow after selecting programming by pre-set programs or
Menu mode.
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Set display format 24h or am/pm
Select 24h or am/pm (
+/- )and con-
firm with
OK .
1 1 2
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Set hour
Select hour (
+/- )and confirm
with
OK .
1 1 2
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Set week day
Select week day (
+/- )and confirm
with
OK .
1 1 2
Set minutes
Select minutes (
+/- )and confirm
with
OK .
1 1 2
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
Symbol Keys Setting The Clock, Time & Day
Setting The Timer

3
Prog.
Programs P01-03 (If Used)
The switching on and off times for
programs P01 to P03 are preset
(pre).
The user can change these pro-
grams.
Individual (custom) program, P--
Under the menu option P-- you have
the option of creating a user-defined
program.
This program can be changed at
any time. There are up to 20 me-
mory locations available for 10 OFF
and 10 ON commands.
You can allocate a corresponding
weekday or week block to each
memory location.
0 247 1 812 14
0 246 22
0247 2012 14
2220
P01: Mo - Su, 1 x ON/OFF
ON
ON
ON
P02: Mo - Su, 2 x ON/OFF
P03: Mo - Su, 3 x ON/OFF
P0x
prog
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Sequence to follow after initially setting time in the Reset mode.
Select pre-set program (
+/- ).
1 1
Once selected the program desired
there are following options:
Menu : terminate programming
OK : Going through pre-set programs
to modify selection (any program
ON or OFF can be modified by using
''
+ ''or '' - ''keys and confirming with
OK ) or accept it with OK key to go
the next free memory location in
order to add new user defined pro-
grams.
e.g. after selecting P02 you should
also program:
Sa-Su 22:30 ON (prog05)
23:00 OFF (prog06)
1a 1b
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
Preset Programs
Using / Selecting Preset Programs P01-P03

4
P--
prog
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
1
2
3
4
6
5
7
Possible week blocks and individual days
Set week day ON
Select week day (
+/- )and confirm
with
OK .
1 1 2
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
P--
prog
Set hour OFF
Select hour (
+/- )and confirm
with
OK .
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
1 1 2
Set minutes OFF
Select minutes (
+/- )and confirm
with
OK .
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
1 1 2
Set week day OFF
Should the OFF command be the
same day of ON command then
select
Menu to terminate program -
ming or select
OK to go to a new
program ON setting.
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
1c 1b1a
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
P--
prog
Shift
Should the OFF command be the following day of ON command then
select ''
+ ''key then select Menu or OK .
Example:
Mo-Fr Mo-Fr
20:00 p.m. - 03:00 a.m. ON 20:00 p.m. - 03:00 a.m. ON
03:00 a.m. - 20:00 p.m. OFF
Tu-Sa
03:00 a.m. - 20:00 p.m. OFF
0 243 20 24320
Monday Tuesday
ON OFFOFF
P--
prog
Sequence to follow after setting time and week day while running Menu
mode or adding programs to the pre-set P01 to P03.
Select program ON
and confirm with
OK .
1
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Set hour ON
Select hour (
+/- )and confirm
with
OK .
1 1 2
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Set minutes ON
Select minutes (
+/- )and confirm
with
OK .
1 1 2
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
Creating User Dened Programs
Special Case

5
del
Select
Menu , then select OK key
until getting onto the ON time of the
program you want to delete.
21
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Select '' --'' with ( +/- ) key and con -
firm with
OK .
11
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
Note:
Switching programmes are deleted
in ON-OFF pairs. If you delete a sin-
gle ON instruction, the correspond -
ing OFF instruction is also deleted.
2
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+ - Menu O
K
Res.
+1h
OVR AUTO
Mode
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
+1h
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
The +1h key is for the change to
daylight savings time.
· By pressing the +1h key 1 hour is
added to the current time.
· +1h is shown on the display.
· By pressing +1h again 1 hour is
subtracted from the current time.
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
The ''+''key serves to change over
between automatic, AUTO to over-
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
7
Mode
ride (OVR) ON and override (OVR)
OFF (CH1).
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
OVR AUTO
OVR AUTO
Deleting Programs
Summer/Winter Time Switching
by Activating / Deactivating Daylight Savings Time
Automatic Operation
The ''+''key serves to change over
between automatic, AUTO to over-
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
7
Mode
ride (OVR) ON and override (OVR)
OFF (CH1).
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
OVR AUTO
OVR AUTO
Automatic Operation is indicated when the
“down” arrow is over AUTO label.
Override Operation is indicated when the
“down” arrow is over OVR label.
The ''+''key serves to change over
between automatic, AUTO to over-
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
7
Mode
ride (OVR) ON and override (OVR)
OFF (CH1).
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
OVR AUTO
OVR AUTO
OVR - Manual Override Operation
Press “Mode” to activate the relay manually.
The “down” arrow over OVR label will indicate
Override is in force and indicates that the
relay is active.
NOTE: You can switch back to AUTO mode by
pressing the “Mode” button. Automatic Opera-
tion is indicated when the “down” arrow is over
AUTO label.
The ''+''key serves to change over
between automatic, AUTO to over-
Mo
Tu
We
Th
Fr
Sa
Su
14
16
18
20
22
24
7
Mode
ride (OVR) ON and override (OVR)
OFF (CH1).
+ - Menu OK
Res.
+1h
OVR AUTO
Mode
OVR AUTO
OVR AUTO

6
2.60"
[66 mm]
2.16"
[54.8 mm]
1.56"
[39.5 mm]
1.50"
[38 mm]
With clear dust-cover
2.88"
[73.1 mm]
4.00"
[102.5 mm]
MOUNTING OPTIONS
DT20: Standard Module Only with Spade Lugs 2.37" 60.1 mm
2.37" 60.1 mm
53.7 mm2.12"
3.4 mm
0.13"
Rear Mounting Holes (4 places)
DTA-D: DIN Rail Mount with Terminal Block
DTA-B: Surface Mount with Terminal Block
2.59" 65.7 mm
3.08" 78.2 mm
1.68" 42.6 mm
2.42" 61.4 mm
1.4" 35.5 mm
2.03" 51.5 mm
Base mounts to surface
DT20 snaps into base
The bottom of terminal
cover has knock-outs for
conduit entry