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Kool-a-matic fan replacement
04-05-2014, 19:59 (This post was last modified: 04-05-2014 21:38 by travelite.)
Post: #10
RE: Kool-a-matic fan replacement
If the NAPA is 1/3 hp at 3000 rpm's and draw's 18 amps, I'm saying use a larger rheostat inline to control the speed to a maximum of 1000 rpm's which will cut your power to 1/10 hp and your current to 6 amps. (Approximate numbers). IOW's, the rheostat (or wire wound resistor) will drop the voltage that the motor sees, but it has to be rated to handle the power dissipated across the rheostat/wire-wound resistor.

A quick search shows that the wire-wound resistor values are something like:
0.46 ohms, 50W
0.6 ohms, 22W
1 ohms, 16W

IOW's, don't run it at full speed! Smile

david brady,
'02 Wanderlodge LXi 'Smokey' (Sold),
'04 Prevost H3 Vantare 'SpongeBob'

"I don't like being wrong, but I really hate being right"
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Messages In This Thread
Kool-a-matic fan replacement - mrkane - 04-03-2014, 00:54
RE: Kool-a-matic fan replacement - davidbrady - 04-05-2014 19:59



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