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General| Brand | Lennox |
|---|---|
| Model | ComfortSense 8500 Series |
| Category | Thermostat |
| Language | English |
Commercial, electronic, 7-day, multi-stage, programmable touchscreen thermostat.
Open case with screwdriver to separate unit from base.
Choose location 5 ft above floor with good air circulation.
Avoid drafts, heat sources, and enclosed areas for accurate sensing.
Use wall plate as template for wiring cutout and anchor drilling.
Terminals CM- and CM+ use S-Bus wiring per Table 2.
Details R, TT, OC OC, CM- CM+, C terminals and their purposes.
Connect wiring between CS8500 and applicable controller.
Access via MENU > TECHNICIAN SETTINGS (PIN 864).
Set CS8500 S-Bus address to match rooftop unit.
Set Smart Hub (central hub or NCP) to ON/OFF.
Ensure 24VAC is supplied to the CS8500.
Verify CS8500 S-Bus address matches M2/M3 controller address.
Check communication cable wiring for issues.
Temp sensor reads outside normal range; system displays '--'.
External sensor reads outside normal range; unit switches to internal sensor.
Errors during power-on or operating mode; may restore factory defaults.
Invalid or out-of-range humidity readings; home screen displays '--'.
Invalid or out-of-range CO2 readings; home screen displays '--'.
Detected failed (offline) state; requires listening for valid message.
Errors displayed in notification/technician screens; contact service.
Errors displayed in notification/technician screens; check RTU state.
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