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Heat Pumps and thermostat

Yahoo Message Number: 22258
Not a big question, but I'm curious: I have 3 AC/heat pumps on my Affinity. On my thermostat, the #1 and #3 pump fan speeds are permanently set at low speed. The #2 pump fan can be set to AUTO. The difference is that when reaching the set temp, #2 pump and fan will shut down completely, while #1&3 fan will continue running, blowing cold air. Doesn't make sense to me. Is this your setup too?

Claude

1997 40' Affinity #5448 single slide