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Marine Air Systems Information
September 9, 2011
9:28 am
Steve Pooler
Forum Posts: 1127
Member Since:
November 12, 2008
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Not sure what happened to your first post either, but if it was yesterday, We did have the forum down for maintenance part of the day.


This manual should help you with wiring of the T-Stat…Diagrams are on the last pages… ** you don't have permission to see this link **

As far as replacement T-Stats…We stock the Cruisair version which is $3.00 more than the Marine Air version but has an extra (smaller) sensing bulb that extends further from the larger one & go's into the discharge air flow (just punch a small hole in the duct)…It's called an Anticipating bulb, and this model has a closer temp differential (TD) that will keep the temp in the cabin closer to where you set it than the single bulb Marine Air model…

The Cruisair part # is 4060603 and is $82.00 plus freight…



September 9, 2011
8:55 am
New Member
Forum Posts: 2
Member Since:
September 8, 2011
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Sorry if this is a double post, not sure what happened to the original (my first post).


Trying to find wwiringinformation on a Marine Air Systems model CM9H S/N 87E22893-10F ccapacity9000 110v

Looking for connections on the thermostat.

TheThermostat a Ranco 17-229-00   #8720 18

can I use any 17 series? is there a replacement themthermostat

nt find technical help on either from the manufmanufacturer's anyone help?