Instruction for garrison timer model rct 100 - Hardware & Accessories

SOURCE: how to set a garrison

I think Garrison is also UPM timers.
But this is not 100% guarantee.
Web search for Garrison RCT yields no clear result or photo.
Following page has photo and 1 manual that applies to RCT
http://waterheatertimer.org/UPM-timers-and-manuals.html

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