The Delay Relay is a wonder indeed.
Very easy mod and will allow air conditioner use in times of high demand at older campgrounds where the ability to serve up amps is limited without killing the supplied voltage.
My 15K air conditioner will draw 28 amps for about 5 seconds during start up and then drop to about 14.5 amps when running. (This is normal for a 15K AC - a 13.5K runs at 12.5 amps I am told.)
Last July, this was a problem at our favorite Gettysburg campground when the voltage at our site would drop too low to turn over the compressor at that amperage. With this mod, the peak start amps drop to 17 volts for 4 seconds for the compressor alone, then drops to 8 amps for the delay, then to about 19 amps when the blower starts, then down to its running amperage of 14.5 amps.
Low voltage and air conditioning
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW