Need a (FREE) manual for a Garrison ADR Timer, model#ET420C; everyone (manual) I saw so far, want to charge for the manual.

https://manualzz.com/doc/en/5296545/upm-et420c-owner-manual

Contact the toll free number on your ac. I too had no luck finding the manual through web searches but called the toll free number and within minutes they emailed me a digital copy of the manual.

More information is needed to find manual.
ET130 timer appears to have 6 buttons with 3 buttons on each row.
http://hkm888.com/upm-marketing-et130-indoor-programmable-timer-reviews.html

Review options below:

1) Add a comment and describe timer buttons in detail so I can match buttons with known timers.

2) Open following links and check if manuals for ET525, ET420C, ET420 might have same button and programming relationship.
http://waterheatertimer.org/UPM-timers-and-manuals.html#ET420C
http://waterheatertimer.org/UPM-timers-and-manuals.html#ET130

Add a comment please

ET420C manual is longer than space allowed for free answer.
Moreover, this manual leaves off key steps and is totally unclear, just as you discovered.
http://waterheatertimer.org/pdf/ET420C-Manual.pdf
On-line manual has page numbers, but pages are not in order, so look carefully at page numbers.
http://waterheatertimer.org/UPM-timers-and-manuals.html#ET420C

1) Let me work alongside you while we look go through manual.

2) This timer is simple electronic clock, like alarm clock.
Look at page 3 of manual about setting the clock. (Remember to look carefully at page numbers)
Clock needs to know what time it is at your house right now.
Manual shows 10 steps for setting current time.
You use arrow keys to set clock.

3) Next look at page 4 "program settings"
Use arrow keys to select program number
Program number 1 thru 20 appear on display

In my opinion, it appears that program1 is ON, and program2 is OFF
So program1 will be when you want chlorinator to turn ON
Program2 will be when you want clorinator to turn OFF
The manual is missing this key detail, so look at display to see if it shows program1 ON and program1 OFF ... if the ON and OFF do not display, then timer sets as described above.
Make sure you set same days for ON and OFF times >> if programs have conflicts, then timer will not operate as expected.

How to set programs:
Use arrow keys to select program1 and then press SET
Use arrow keys to select day, and then SET, and then arrow keys to select hour, and then SET, and then arrow keys to select minutes, and then SET.
Repeat steps for program2.

4) Mode appears on page 7 of manual
Again the manual is totally unclear how to set MODE or what buttons are pushed
I have the opinion that you do not set MODE unless you use Countdown or Random feature.
So see if timer operates without setting MODE

5) Add a comment if you get stuck, and I will review manual with you while you push the buttons.
You can add as many comments as needed, and I will respond as needed.

6) For heavy-duty outdoor timer with fewer functions, that is easier to program:
Up to 1/4 Hp, 1000Watts
http://waterheatertimer.org/Woods-timers-and-manuals.html#6-24
http://www.amazon.com/Woods-59403-Heavy-Duty-Outdoor-Digital/dp/B002KS7EOK
Or
http://www.amazon.com/Intermatic-HB800RCL-Seven-Outdoor-Digital/dp/B001KBZUNK

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

I heard from 1 source that Garrison RCT100 is UPM remote timer, but nobody has added a comment to confirm or negate that source.
http://waterheatertimer.org/UPM-timers-and-manuals.html#Garrison

Add a comment to help fixya community serve best answers possible, or for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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

If this is not your timer or manual, then add a comment for more free help.
Included with your comment, isa link to photo of product that you posted on your website so we at fixya can clearly define the product and continue providing best service possible.

Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.

Your excellent description of the buttons sounds like UPM EC420 or 420C
Link below has drawings of timer, and links to manual
http://waterheatertimer.org/UPM-timers-and-manuals.html#ET420C

Instruction manual is too many characters long to fit allowed space for fixya answers, so if you need help with particular part of manual, add a comment and I will give additional free help.

Also take advantage of fixya phone service.
For a price, fixya expert reads manual to you over the phone while you program the timer.

Page shows all ET series timer manuals.
Including ET420 and ET420C
ET420 appears to be a plug-in outdoor timer
http://waterheatertimer.org/UPM-timers-and-manuals.html

UPM website that posts these timers seems to be shut down.

UPM shows ET420C timer
http://waterheatertimer.org/UPM-timers-and-manuals.html

Manual for timer
http://waterheatertimer.org/pdf/ET420C-Manual.pdf

UPM shows ET420C timer
http://waterheatertimer.org/UPM-timers-and-manuals.html

Manual for timer
http://waterheatertimer.org/pdf/ET420C-Manual.pdf