Grasslin Digital Programmable Generator Exercise Timer

Click for Installation manual
Click for Instruction manual

24V Version
Factory Direct: $125

120V Version
Factory Direct: $119

Grasslin FM1D20A Exercise Timer – A QUICK OVERVIEW

The 24V version directly replaces the timer used in most older Onan Transfer Switches.

The Grasslin FM1D20A time switch is an ideal choice as a generator exercise timer because of its low cost, ease of programming, reliability, and extended memory protection (4 days min. without power). Although the FM1D20A can accept up to 20 “on” and “off” events in a week, typically only one “on” and one “off” event is required for generator exercise use. The duration of the exercise period is simply the elapsed time between the “on” event and the “off” event. After installation, the timer is programmed with the following steps.

• Initial reset after powering on.
• Select AM/PM or 24-hour (military) time.
• Set the time of day (includes standard/daylight option).
• Set the exercise start time.
• Set the exercise stop time.
• Verify settings.

Settings may be changed or deleted at any time. Programmed information will be retained for a minimum of 4 days without power. Please refer to the enclosed instruction sheet for details of programming steps, verification and the meaning of the display icons.