I put in a new hot air/central AC unit back in '05 to replace the old hydronic/hot air boiler... A/C is going full blast now with the heat wave and I decided to see if there were any special A/C operating instructions with the unit's instructions. "Home Owner's/User Guide" contains no operating instructions at all, only installation specs.
1. Supposedly this unit has a 4 speed fan system. I have only experienced 2 speeds, the lower one when heating and a higher speed with the A/C. What contols which speed the blower uses?
2. There is a small black rocker switch on the control box on the front of the furnace unit. This activates the blower constantly on a slower speed than when heating. Should this be "ON" for A/C and better air circulation?
3. What's the best thermo "differential" setting for central A/C? Right now it's set for 1º above for "OFF" and 1º below "ON". Unit is running 20 minutes plus per cycle.
What I figured at the time was the better company to install/maintain (and not by price) has gone bye-bye and I'm trying to save a little $ on the operations running more efficiently.
Edited by HydroHarold, July 18, 2013 - 12:04 PM.