Grasslin Digi 42/2 Operating Instructions Manual
Digi 42/2
Two Circuit Electronic
24 Hour or 7 Day Time Switch
Operating Instructions
APPLICATION
Time based control of lighting, ventilating, heating,
cooling or other electrical loads in commercial and
industrial applications. The Digi 42 time switches are
programmable for 24-hour or 7-day schedules as well
as a “8th day” or holiday schedule.
TECHNICAL DATA
Output–2 SPDT relays with dry contacts
Switch Rating: 16A/250VAC general purpose
1000 watt tungsten @ 240V
500 watt @ 120V
1/2 hp @ 120VAC, 1 hp @ 240VAC
720VA pilot duty
2 week battery back-up
Supply voltages: Separate Models – 24VAC/DC,
120VAC, 208/240VAC, all 50/60Hz (refer to prod-
uct label)
Shortest switch time–1 minute
Ambient Temperature Range –20°F to 140°F
(–28°C to 60°C)
AM/PM LCD display or 24:00 hr. military display
Input Power: 4VA
Screw terminal connections for up to #12AWG wire
Accuracy ± 4 minutes per year
Daylight time changeover: manual or automatic
NOTE:
When first applying power, it may take several
minutes for the battery to take a charge. If the LCD
display does not come on after a few minutes, press
reset.
Installation
To the installer:
1. Read operating instructions carefully.
2. Check the input and output ratings marked on the unit to
make sure this product is suitable for your power supply
and application.
3. Disconnect power supply prior to installation to prevent
electrical shock.
4. Wire in accordance with National and Local electrical code
requirements.
The Digi 42 time switch can be surface, flush or rail mounted
and is also available with an enclosure for stand-alone applications (GMX2).
MOUNTING
Lift off front cover and loosen the two screws on opposite
corners. Pull off plug-in base with a left-to-right rolling motion.
SURFACE MOUNTING
(inside panel)
Place screws through holes in base and screw to back of
panel or wall. Connect wires to wiring terminals.
Place terminal cover over terminal block and, by lining up the
two screws with corner holes in base, push timer firmly onto
plug-in base. Tighten the two screws. A base for DIN rail mounting is also available as an option. Order Part No. MB-DIN.
PANEL MOUNTING (flush mounting through panel door)
Cut a square hole 2-5/8” x 2-5/8” (66 x 66mm) in the front
of the panel. Remove plug-in base and insert the time switch
through the opening. Place the flush mounting bracket over
rear of the unit to secure to the panel door.
For stand-alone installations, the unit may be surface
mounted inside an E100 indoor or E200 outdoor enclosure
which is available from Grasslin Controls Corporation or your
wholesaler.
WIRING
1. Wire power to input terminals 1 and 2 (
make sure to apply
correct voltage; use of incorrect voltage will void warranty
).
2. Wire power to circuit 1 and 2 common terminals. Wire NO
(closed during ON times) or NC (open during ON times) to
the load.
COM COM
Circuit 1 Circuit 2
■ KEYPAD DESCRIPTION
Setting the Time/Automatic Run Mode
Prog. Program Mode
Res.* Reset: Clears all programs and time
Select ON or OFF in Prog. Mode, Manual Override in Run Mode
±1h* Manual Daylight Time Change
h Setting the Hour (12:– – AM)
m Setting the Minute (12:01 AM)
Day Set Current Day and Select Days to be Omitted
Sel. Omit Day Selected w/Day key
Holiday Program
*Recessed keys; use a pen point to press
■ LCD DISPLAY ELEMENTS
■ PROGRAMS
The Digi 42/2 will accept up to 42 programs
A program consists of:
1. An ON or OFF command
2. Time of day (Hour and Minute)
3. Single day or multiple days
A program is required for each ON event, and a program is
required for each OFF event.
NOTE: MULTIPLE ON OR OFF EVENTS MAY BE PROGRAMMED.
For example, Program 1 may turn the office air conditioning ON at 8AM
Mon.-Fri. Program 2 may turn the air conditioning OFF at 5PM Mon.-Fri.
If someone is working late, they may press the override key to turn on
the air conditioning. If they forget to press the override key again when
they leave, the air conditioning will stay on all night (or all weekend).
To prevent this from occurring, additional OFF times may be pro-
grammed.
• Program 3 can turn the air conditioning OFF at 6PM.
• Program 4 can turn the air conditioning OFF at 7PM.
• Program 5 can turn the air conditioning OFF at 8PM., etc.
!
IMPORTANT: BEFORE PROCEEDING WITH SETTING THE
TIME AND PROGRAMMING THE UNIT, PRESS THE RESET
KEY TO CLEAR ALL DATA FROM THE MEMORY.
■ SELECTING AM/PM OR MILITARY TIME
After pressing reset, the display may show AM (right). The numbered day symbols will be flashing on
and off.
If the display does not show AM, it is
in military time mode (24:00 hr.) To
change to AM/PM mode, press and hold
the h key and press the ±1h key once.
AM will appear in display.
If display is in AM mode and military
mode is desired, press and hold the h
key, press the ±1h key once.
■ SETTING THE TIME
NOTE: If the h and m keys are held down longer than 2 seconds,
the numbers will advance rapidly.
Press and hold the key during the following:
(If Daylight Savings Time is in effect, press
±1h
first)
1. Press h to advance to the current hour
(while holding down the key)
2. Press m to advance to the current minute
(while holding down the key)
3. Press Day repeatedly to advance to current day (while holding
down the key)
NOTE: If the days are flashing, it indicates the day of the week was
not set when setting the time. The timer cannot be programmed unless
the day of the week is entered.
■ MANUAL DAYLIGHT TIME CHANGEOVER
Each year, in the Spring, press ±1h to advance the time an hour. In
the Fall, press ±1h to set back an hour.
■ SETTING AUTOMATIC DAYLIGHT TIME
CHANGEOVER (OPTIONAL)
NOTE: It is only necessary to program the changeover dates once.
The timer will then automatically change the time at 2:00AM on the first
Sunday in April and the last Sunday in October until the year 2079.
1. Press and hold the ±1h key
and press the Day key once. If
in AM/PM mode, “12:31” (Dec.
31) will be flashing. If in military
time mode, “31:12” will be
flashing.
2. Enter the current (today’s) date.
Example: June 15, 1997.
Press m key (for date) to 15
first and then press h key (for month) to 06 (If in military time, h
is date and m is month)
3. Press ±1h once, a 2 under Tu and 1995 appears in display
4. Enter the current year. Example: 1997. Press m key twice to
1997 (If you overshoot, hold down the m key – the years will
scroll to 2079 and back to 1995)
5. Press ±1h once, a 3 under We and AU appears in display,
which indicates preset European dates.
6. Press m key once so display shows cHA (If m key is inadvertently pressed twice and HA shows in display, press m key two
more times until cHA shows)
7. Press ±1h once, a 4 under Fr and 03:30 (for 1997) appears in
display, which indicates March 30 (30:03 in military)
8. Enter the date for spring time change. Example: April 6, 1997.
Press h key (for month) to 04. Press m key (for date) to 06 (If
in military time, h is date and m is month)
9. Press ±1h once, a 5 under Sa and the fall time change date
appears in display. Example: 10:26 for 1997
10. Press key to enter Run Mode
Daylight Time Changeover Dates
1997 April 6 - October 26 2002 April 7 - October 27
1998 April 5 - October 25 2003 April 6 - October 26
1999 April 4 - October 31 2004 April 4 - October 31
2000 April 2 - October 29 2005 April 3 - October 30
2001 April 1 - October 28 2006 April 2 - October 29
Days of the Week ➠
Daylight Time Symbol ➠
AM and PM Symbol ➠
Channel Indication ➠
➠
➠
➠
➠
➠
Holiday Indicator
Time of Day or
Switching Time
Manual Override ON
ON/OFF Symbol
OFF Symbol
ON Symbol
Continuous OFF Symbol
Continuous ON Symbol
Run Mode Symbol
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