Intermatic MIL72 Owner's Manual

MIL 72 Series

24-Hour and 7-Day Universal
Time Switches

APPLICATION

Time based control of lighting, ventilating, heating,
cooling or other electrical loads in commercial and
industrial applications. The MIL 72 time switches are
available with a 24-hour or 7-day program dial with a
single pole/double throw switch.

The MIL 72A series is intended for surface mounting.
The control is completely enclosed in a plastic housing
and includes a terminal cover and sub-bas e fo r
installation and hard wiring.

The MIL 72E is intended for flush (panel) mounting. All
units are supplied with a clear plastic cover.

TECHNICAL DATA

Supply Voltage: Synchronous: 24, 120 and 240VAC,
60Hz models

Quartz: 24V AC/DC, 120 and

240VAC 50/60 Hz

Switch Type: SPDT

Switch Rating: 21A @ 250VAC resistive

1350 W tungsten
1HP @ 120VAC
2HP @ 240VAC
16 FLA, 96 LRA, 120VAC ind.
12 FLA, 72 LRA, 240VAC ind.

Power
Consumption: 24V: 0.1VA; 120V: 0.5VA; 240V: 1.0VA

Ambient
Temperature Range: –40°F to 180°F, synchronous units

–14°F to 131°F, quartz units

Reserve Carryover: 150 hours for quartz units
Agency Approvals: UL Recognized

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
supply power and application.

3. Disconnect supply power prior to installation to
prevent electrical shock.

4. Wire in accordance with National and Local
electrical code requirements.

The MIL 72 time switch can be surface, flush or rail
mounted and is also available with an enclosure for
stand-alone applications.

SURFACE MOUNTING—MIL 72A

Remove dust-proof cover, loosen two screws on
op p os it e c or ne rs . R em ov e t he h o us in g t ha t
surrounds the time switch and the terminal cover
away from the base.

Place screw through pre-set holes in base and
screw to back of panel or wall.

Wire in accordance with instructions. Depending
upon the specific installation, you may find it more
conv eni e nt to have wir i ng com p let e d be fore
attaching the base. Replace terminal cover and
push timer firmly onto plug-in base. Now replace
housing and secure with screws.

NOTES:

• The MIL 72A may also be DIN rail mounted—
simply break out housing part that fits over rail on
each side.

• 24V quartz unit will operate on 6VDC, 12VDC, or
24VDC

MIL 72E

(Flush Mounting)

MIL 72A

(Surface Mounting)

For stand-alone installations, the unit may be surface
mounted in s i de a n indoor enclosure wh i c h is
available from Inte rmatic Incorporated . or your
wholesaler.

PANEL MOUNTING—MIL 12E

Cut a square hole 25/8” x 25/8” (66mm x 66mm) in the
front of the panel. Insert the time switch through the
opening. With screwdriver press down and turn
outer screws (A) until flanges are in position to fasten
the unit in front panel, then release. Insert plugs into
holes as per illustration (B).

Use1/4” quick connects and make connections in
accordance with the wiring diagram shown and
applicable code requirements.

WIRING

1. Disconnect the power.

2. Wire according to the proper voltage marked on
the unit. Wiring to incorrect voltage will void the
warranty.

3. Connect wiring according to the wiring diagram.
The terminals on the MIL 72A sub-base w ill
accommodate 10 to 24 AWG wire.

PROGRAMMING

The weekly program dial shows the seven days of
the week and AM/PM imprints for each day. The 24­hour dial has quarter-hour divisions and AM/PM
indications.

Th e ti me switch i s se t by pushin g the cap tive
trippers to the outer ring position for the entire period
that the load is to be turned ON, i.e., fifteen minutes
for each tripper on the 24-hour dial and 2 hours for
each tripper on the 7-day dial. When the tripper is
pushed to the i nside, the sw itch is in the OFF
position.

SETTING TIME

TO SET THE CURRENT TIME (AND DAY OF
W E E K ON 7 D AY U N I T S ) , TU R N TH E
MINUTE HAND CLOCKWISE. DO NOT SET
THE TIME BY ROTATING “OUTER” DIAL.

Turn the minute hand clockwise until the day of the
week (7-day timer) and the time of day on the outer
dial is aligned with the triangle marker on the inner
dial (two o'clock position).

Example for 7-day program dial Monday 10:30 AM.
Turn the minute hand clockwise until Monday 10:30
AM is aligned with the triangle on the inner dial. The
hour and minute hand will show exactly 10:30.

Example for 24-hour program dial 10:30 AM. Turn
the minute hand clockwise until 10:30 AM is aligned
with the triangle on the inner dial. The hour and the
minute dial will show exactly 10:30.

MANUAL OVERRIDE

All MIL 72 units are available with an optional 3-way
manual override (type designation “H”).

B

A

3-way manual
override switch

Off position with trippers
pushed in (trippers pushed out
will close contacts 3 and 4 and
turn load on)

I = permanent ON

= automatic

0 = permanent OFF

A

B

Terminal Connections

Indoor Enclosure

INTERMATIC INCORPORATED

Spring Grove, IL 60081-9698

www.intermatic.com

158--00539