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Two Stage Thermostat Keeps Running Second Stage Forced Air Even When Temp Diff Isn't Reached
I have an Aprilaire 8870 two stage thermostat set to run radiant floor heating as the first stage and forced air heating as the second stage. The radiant floor heating is set to turn on when the temperature is 1 degree below set point and the forced air is set to turn on at 2 degrees below set point.
The problem I have is that the forced air comes on after the radiant has been on a while and this happens even though the temperature doesn't drop to 2 degrees below the set point.
Any ideas? The only thing I can think of is that the thermostat is programmed to turn on both heating stages if the temperature hasn't reached the set point after a certain amount of time, but that seems to make setting the set point for the second stage pointless.