Intermatic FM/1 Series Operating Instructions

FM/1 Series

Time Switches

TECHNICAL DATA

Supply Voltage:

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 watt tungsten

1HP @ 125VAC

2HP @ 240VAC

Power

Consumption:

24V: 0.1VA; 120V: 0.5VA; 240V: 1.0VA

Ambient

Temp. Range:

–40°F to 180°F, synchronous units

–20°F to 140°F, quartz units

Terminals:

1/4” spade terminals

Reserve Carryover:

7 days for quartz units

Weight:

Approximately 3 oz.

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 requir-

ing 24-hour or 7-day scheduling.

WIRING

Verify input voltage stated on back of unit. Use 1/4” quick con-

nects 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. 

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. 

Terminal Connections

Contacts shown in “Off” position (trippers pushed inward) 

“On” position (trippers pushed outward) will close contacts 3 & 4

4

5

3

1

M

INPUT

COM

NO

NC

2

http://waterheatertimer.org/Intermatic-trippers-and-parts.html

http://waterheatertimer.org/Intermatic-timers-and-manuals.html#PB

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