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Miller M1MB, added heat pump fan speed too high
Posted: Sat Oct 13, 2012 8:34 am
by jpingram5
Working on a switching out an AC to a heat pump. It's a Miller M1MB 56k BTU Gas with a 2.5 ton heat pump now on it. Before it was just AC. When it calls for the heat pump the fan speed is running high like it does cooling. When it is switched to call for backup gas heat the fan speed runs correct. Anybody have a wiring diagram or some input on this would be great.
Re: Miller M1MB, added heat pump fan speed too high
Posted: Sat Oct 13, 2012 9:22 am
by jpingram5
okay brain fart saturday there was one on the inside of the service door. but it doesn't really give me much info as far as speed adjustments. below is a pic of the terminals. from right to left the 1st black wire is on "COOL", the 2nd Orange is on "HEAT", the it goes L1 & XERM.
I have a Blue & Red wire left tied up coming from the fan. So again the fan issue is only when the heat is being called for the Heat Pump.
