Thread Tools Search this Thread Display Modes
Old 05-22-2018, 06:42 PM   #1
1 Rivet Member
Currently Looking...
Austin , Texas
Join Date: Mar 2018
Posts: 7
How to know what wattage the Coleman Mach AC in my FIRST Airstream is drawing?

I am the proud new owner of a 1965 Safari! My first Airstream!

The owner of the home I live in (and park it next to) wanted me to get an electrician out to make sure the home wiring could handle the load.
I'm in Texas and the AC will be working a LOT this summer since my son will be using it as a personal space sometimes here at the house.

The closest outlet is a 20 Amp. I need to figure out how much power the AC pulls. Does anyone know about Coleman Mach rooftop AC? Part # 6759D715 and serial # 079830674 . I looked online and got overwhelmed trying to make sense of what came up since my model number wasn't coming up. The electrician didn't pull the AC open to look and could not tell from the exterior.

Can anyone point me towards a way of figuring out how many watts this one will need?
Attached Thumbnails
Click image for larger version

Name:	airstream.jpg
Views:	21
Size:	993.5 KB
ID:	311747  

DeniseP is offline   Reply With Quote
Old 05-22-2018, 06:52 PM   #2
Rivet Master
TheGreatleys's Avatar

1974 27' Overlander
Baltimore , Maryland
Join Date: Mar 2016
Posts: 760
That part number looks like the ceiling assembly part number. Did you get it off the ceiling assembly or the roof top unit?

You'll need to take the shroud off to find the model number of the roof top unit. It's not possible to tell which one you have from the picture because several different sizes have the same shroud.

TheGreatleys is offline   Reply With Quote
Old 05-22-2018, 07:01 PM   #3
Rivet Master
A W Warn's Avatar

2000 25' Safari
1999 34' Excella
Davidson County, NC , Highlands County, FL
Join Date: Aug 2006
Posts: 3,256
You can start and run the AC unit on a 20 amp circuit, but over time it will damage the air conditioner because of low power supply. It will also overheat the adapter and the receptacle, and those will be damaged too.

The specs for AC units say if the length of the wire is 25' or less it can be 12 gauge. Longer runs are required to be larger gauge wire, meeting the NEC. The 20 amp circuit in your house is 12 gauge, if it is on a 20 amp breaker. If it is on a 15 amp breaker is only on 14 gauge wire. You are adding more wire length with the power cord, exceeding the AC unit's specs. (heating up wire, burning receptacle, burning cord ends, damaging the air conditioner, maybe damaging the house wiring)

The issue is: the AC unit itself requires a little more than 20 amps, for milliseconds, just to start the unit, a little less amps when running. When you use any other outlet inside the trailer the total load exceeds 20 amps at times, (tripping breaker often).

Even if you do not connect anything else to receptacles, the converter will cycle on and off at times when the AC unit is starting, exceeding the 20 amp capacity. (tripping breakers, and damaging things)

To do what you are wanting, you need a 30 amp 120 volt dedicated circuit, with an outlet to match the cord on your trailer.
2014 Silverado 1500 Crew Cab 5.3L maximum trailering package (yes, I'm towing the 34')
A W Warn is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
NEW Coleman-Mach Mach 8 15,000 BTU Air Conditioner – Arctic White Pygmypoacher Airstream Classifieds 0 07-16-2016 01:53 AM
NEW Coleman-Mach Mach 8 15,000 BTU Air Conditioner - Arctic White Pygmypoacher Airstream Classifieds 0 01-22-2016 06:53 AM
Generator Size for 13,500BTU Coleman Mach 3??? dscluchfc Generators & Solar Power 26 07-28-2010 07:07 PM
Coleman TSR Mach 3 Drain tube bertro Furnaces, Heaters, Fireplaces & Air Conditioning 3 06-07-2008 11:57 AM
Coleman Mach III gasket bkahler Furnaces, Heaters, Fireplaces & Air Conditioning 14 08-13-2007 06:11 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:38 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.