Intermatic GMX Owner's Manual
GMX Series Time Controls
APPLICATION
The GMX Series are universal electromechanical time
switches within UL TYPE 1 indoor enclosures or UL TYPE
3R outdoor enclosures intended for the control of lighting,
heati ng, air con ditioni ng, pump s, motors, or gen eral
electrical circuits in residential, commercial, industrial and
agricultural facilities. Basic models are:
GMX ST SPDT 24 hour synchronous drive
GMX SW SPDT 7 day synchronous drive
GMX QT SPDT 24 hour quartz drive
GMX QW SPDT 7 day quartz drive
SPECIFICATIONS
Switch Rating: SPDT Switch
21A Resistive @ 125/250 VAC
1 HP @ 125 VAC
2 HP @ 240 VAC
1350W Tungsten @ 240 VAC
675W Tungsten @ 120 VAC
ENVIRONMENTAL RATINGS
Ambient Temperature: –40°F to 180°F synchronous drive
–20°F to 140°F quartz drive
Humidity: 0-95% RH, Non-condensing
WIRING CONNECTIONS
Screw clamp terminals for up to AWG #10 wires.
Agency Approvals: UL Listed
INSTALLATION
1. Select knockouts to be used. Remove the inner (1/2”)
knockout by inserting a screwdriver in the slot and
carefully punch knockout loose. Remove slug. If the 3/4”
knockout is required, remove the outer ring with pliers
after removing the 1/2” knockout. Smooth edges with a
knife if necessary.
2. Place enclosure in desired mounting location and mark
the three mounting holes.
3. Drill holes for #10 screws, start screws in holes.
4. Place enclosure over screws and tighten screws.
5. Connect conduit hubs to conduit before connecting the
hubs to the enclosure. After inserting hubs into enclosure,
carefully tighten hub lock nut. Do not over-torque.
6. Wire in accordance with National and Local Codes.
GROUNDING: This enclosure is of plastic construction and
does not require a ground connection and does not require
bonding in pool applications.
This enclo sure doe s not provide groundi ng bet ween
conduits. When using non-metallic conduit or cable, connect
the ground wires of all cables together with a twist on wire
connector. When metallic conduit is used, use grounding
type bushings and a jumper wire between each conduit.
GMXST-I-120
Programming Instructions
SETTING THE TIME: TO SET THE CURRENT TIME
(AND DAY OF WEEK ON 7 DAY UNITS), TURN THE
MINUTE HAND CLOCKWISE. DO NOT SET THE TIME BY
ROTATING “OUTER” DIAL.
PROGRAMMING: The 24 hour model has trippers of 15
minute increments, and a AM/PM indication on the outer dial.
The 7 day model has trippers of 2 hour increments, and the
outer dial shows the 7 days of the week and AM/PM for each
day. Push the captive trippers outward for the time period(s)
that the load is to be on (Normally open contacts closed).
Manual Override: With the manual switch in the middle
position, the time switch is in automatic mode and will switch
at the programmed times. In the upper position “I”, the load
is permanently ON. In the lower position, “O”, the load is
permanently OFF.
BATTERY POWERED RESERVE (Quartz Models): In
case of power failure, the built-in nickel-cadmium battery
maintains the time of day for a minimum of 7 days.
Typical Wiring Diagrams
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer and Load
H
N
TO LOAD
T
TO 208/240V LINE
TIMER NCNOCOM
1
2
3
4
5
208/240V Timer and Load
L1
L2
TO LOAD
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer 24-240V LOAD
H
N
LOAD
TO 24-240V LINE
T
TO 208/240V LINE
TIMER NCNOCOM
1
2
3
4
5
208/240V Timer and Load
L1
L2
TO LOAD
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer 24-240V LOAD
H
N
LOAD
TO 24-240V LINE
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer 24-240V LOAD
H
N
LOAD
TO 24-240V LINE
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer and Load
TO LOAD
T
TO 208/240V LINE
TIMER NCNOCOM
1
2
3
4
5
208/240V Timer and Load
L1
L2
TO LOAD
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V Timer 24-240V LOAD
H
N
LOAD
TO 24-240V LINE
LOW
HIGH
COM
T
TO 120V LINE
TIMER NCNOCOM
1
2
3
4
5
120V TWO SPEED FAN
H
N
120V Timer, 120V Load
120V Timer, 24V, 120V, or 240V Load
208/240V Timer, 208/240V Load
Enclosure Dimensions
INTERMATIC INCORPORATED
Spring Grove, IL 60081-9698
www.intermatic.com
120V Two Speed Fan
158--00760
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