FM1STUZ-24U - Timer INTERMATIC - Free user manual and instructions

Product Type	Time Switch (24-hour or 7-day programmable)
Brand	Intermatic
Model	FM1STUZ-24U
Supply Voltage (Synchronous)	24 VAC, 120 VAC, 240 VAC, 60 Hz
Supply Voltage (Quartz)	24 VAC/DC, 120 VAC, 240 VAC, 50/60 Hz
Switch Type	SPDT
Switch Rating	21 A @ 250 VAC resistive; 1350 W tungsten; 1 HP @ 125 VAC; 2 HP @ 240 VAC
Ambient Temperature Range (Synchronous)	-40°F to 180°F (-40°C to 82°C)
Ambient Temperature Range (Quartz)	-20°F to 140°F (-29°C to 60°C)
Terminals	1/4" spade terminals
Reserve Carryover (Quartz)	72 hours
Agency Approvals	UL Recognized
Weight	Approximately 3 oz (85 g)
Dimensions (Approximate)	2.5" x 2.5" x 1.5" (64 x 64 x 38 mm)
Mounting Options	Flush mount, surface mount in panel, DIN rail mount (with optional housing), indoor/outdoor enclosure available
Programming Type	7-day (SW, QRW models) or 24-hour (ST, QRT models) dial with captive trippers
Manual Override Switch	3-way: Auto (center), Permanent ON (I), Permanent OFF (O)
Applications	HVAC, lighting, refrigeration, security, pumps, spas, and other loads requiring 24-hour or 7-day scheduling
Color	Black (typical)
Operating Voltage Range (24V Quartz)	6 VDC to 24 VDC or 24 VAC

Frequently Asked Questions - FM1STUZ-24U INTERMATIC

How do I set the current time on the FM1STUZ-24U time switch?

To set the current time, turn the minute hand clockwise until the time on the outer dial aligns with the triangle marker on the inner dial (at the two o'clock position). For 7-day models, also align the day of the week. Do not rotate the outer dial.

How do I program the ON/OFF times?

Programming is done by pushing the captive trippers outward (toward the outer ring) for the period you want the load ON. Each tripper represents a time increment: 2 hours for 7-day dials, 15 minutes for 24-hour dials. Push trippers inward for OFF.

What is the function of the manual override switch?

The 3-way manual override switch lets you override the programmed schedule: center = automatic mode, up (I) = permanent ON, down (O) = permanent OFF. In manual mode, the timer continues to run but the output is forced.

What voltage does this timer require?

The timer is available in multiple voltage versions. The model FM1STUZ-24U is a 24V unit, but the FM/1 series includes synchronous units for 24, 120, 240 VAC 60Hz and quartz units for 24 VAC/DC, 120, 240 VAC 50/60Hz. Check the label on your unit for the exact rating.

Can the FM1STUZ-24U be used outdoors?

The basic unit is designed for indoor panel mounting, but an optional indoor/outdoor enclosure is available for stand-alone outdoor use. Ensure the enclosure is weatherproof and rated for the environment.

How do I wire the time switch?

Connect power to terminals 1 and 2 (input). The load connects between terminal 3 (common) and terminal 4 (normally open) or terminal 5 (normally closed). Use 1/4" quick-connect terminals. For 24V units, use a transformer supplying 24VAC to terminals 1 and 2.

What is the reserve carryover and how long does it last?

Reserve carryover is a battery backup that maintains the time and program during a power outage. For quartz models, it lasts up to 72 hours. Synchronous models do not have a carryover.

How many ON/OFF cycles can I program?

The number of cycles depends on how many trippers are used. For a 7-day dial, each tripper covers 2 hours; you can set up to 12 ON/OFF pairs per day (24 trippers total). For a 24-hour dial, each tripper covers 15 minutes; you can set up to 96 ON/OFF pairs per day (192 trippers).

How do I reset the timer to factory defaults?

There is no reset button. To clear programming, push all trippers inward (OFF position). To reset the time, turn the minute hand clockwise to the current time. For quartz units, removing power for more than 72 hours will clear the time memory.

Are replacement parts available for this timer?

Yes, replacement captive trippers and other standard parts may be available through Intermatic distributors. Contact Intermatic customer service or visit their website for parts ordering. The timer itself is not field-serviceable beyond tripper replacement.

USER MANUAL FM1STUZ-24U INTERMATIC

Operating Instructions

FM/1 Series Time Switches

Close-up of a black industrial rotary dial with teeth and scale markings (no readable text or symbols)

TECHNICAL DATA

Supply Voltage: Synchronous: 24, 120 and 240VAC, 60Hz Quartz: 24V AC/DC, 120 and 240VAC 50/60 Hz

Switch Type: SPDT

Switch Rating: 21A @ 250VAC resistive 1350 watt tungsten 1HP @ 125VAC 2HP @ 240VAC

Ambient

Temp. Range: -40^ to 180^ , synchronous units -20^ to 140^ , quartz units

Terminals: 1/4" spade terminals

Reserve Carryover: 72 hours for quartz units

Weight: Approximately 3 oz.

Agency Approvals: UL Recognized

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

APPLICATIONS

The FM/1 series of time switches are designed for control of heating, ventilating, air conditioning, refrigeration, lighting, security, circulating pumps, spas or any electrical load requiring 24-hour or 7-day scheduling.

WIRING

Verify input voltage stated on back of unit. Use 1/4" quick connects and make connections in accordance with the wiring diagram shown and applicable code requirements. When using 24V units, it is important to use transformers that will supply the required 24 volts AC to terminals 1 & 2.

Terminal Connections

Contacts shown in "Off" position (trippers pushed inward) "On" position (trippers pushed outward) will close contacts 3 & 4

graph TD
    A["5 NC"] --> B["4 NO"]
    B --> C["3 COM"]
    D["M"] --> E["2 INPUT"]
    D --> F["1 INPUT"]

MOUNTING

The standard FM/1 units can be flush mounted (mounting kit with screws available) or surface mounted inside a panel. A printed circuit board mounting base is also available. An indoor or outdoor enclosure is available for stand-alone mounting. In addition, unit is also available in DIN housing for flush or surface mounting (see MIL72, Digi 20 or Digi 42 data sheets). Optional clear plastic dust cover is available.

Dimensions

FM/1 synchronous/quartz

TIME SETTING

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.

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.

PROGRAMMING

7-Day (SW, QRW Models)

The weekly program dial reflects the seven days of the week and AM/PM imprints for each day.

The time switch is programmed by pushing the captive trippers to the outer ring position for the entire period that the load is to be turned “ON”, i.e., two hours for each tripper on the 7-Day dial. When the tripper is pushed to the inside, the switch is in the “OFF” position.

24-Hour (ST, QRT Models)

The 24-Hour dial has quarter-hour divisions and AM/PM indications.

The time switch is programmed by pushing the captive 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. When the tripper is pushed to the inside, the switch is in the “OFF” position.

PROGRAMMING WITH MANUAL OVERRIDE SWITCH

AUTOMATIC MODE

In order to operate the time switch module in the automatic mode, the manual switch must be in the center position (automatic) - see diagram.

MANUAL MODE

With the manual switch selector lever the selected programs can be overridden. In the lower position, marked "O", terminals 3 and 5 are permanently closed. In the upper position, marked "I", terminals 3 and 4 are permanently closed (see diagram).

Override Mode

3-way manual override switch

I = permanent ON 自动 0 = permanent OFF

I

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