As for the clicking in the ceiling unit. The furnace isn't directly controlled by those thermostats like it is by most thermostats. That thermostat controls relays in the A/C control box which runs the different functions, so there's a relay in there that controls the furnace. What you're most likely hearing is a relay pulling in when the thermostat calls for something to happen. If it happens just before the furnace runs then it's the furnace relay pulling in a little while before the furnace actually starts.
Here's the initialization procedure for that thermostat,
Quote:
System Initialization
A system initialization will need to be performed by installer after system installation.
1. Make sure CT thermostat is Off. See “D. Quick Reference” on page (3).
2. Press the button, and simultaneously press and hold the / Mode button for three seconds.
LCD will show “- -”.
This completes system initialization.
Furnace On / Off temperature differential should be set at this time. See “C. “Furnace” - Furnace
Mode” on page (7) for more information
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Here's also a link to the manual.
Capacitive Touch Thermostat Operating Instructions
Linear Mode
