M3 Unit Controller - Return Air Temperature Limits Setup; Cs8500 Troubleshooting - Lennox ComfortSense 8500 Installation And Setup Manual

7. NETWORK SENSOR > RELATIVE HUMIDITY
needs be set to YES if needed. Press the
SAVE button to continue.
8. NETWORK SENSOR > TEMPERATURE will
need to be set to YES (mandatory).
9. Press the SAVE and quit the menu.
NOTE: If the CS8500 is not communicating with
the Unit Controller, cycle power to the Unit
Controller.
M3 Unit Controller — Return Air Temperature
Limits Setup
The M3 unit controller may be set up to monitor
return air temperature and interrupt the demand if
return temperature is above the heating adjustable
limits.
To enable this feature set parameters 113 and 115
locally at the Prodigy 2.0 unit controller which is
located inside Lennox rooftop unit.
• Adjusting parameter 113 enables return room
temperature limits. Default is 0 (OFF). To enable
set to 1 (ON). Go to SETTINGS > RTU OPTION
> EDIT PARAMETER = 113 (EN RET AIR TMP
LMT)
• Adjusting parameter 115 is used to interrupt a
heating demand. Default is 85.0°F. Adjustable
range is 60.0°F to 100.0°F. Go to SETTINGS
> RTU OPTION > EDIT PARAMETER = 115
(HEAT RET AIR LIMIT)
If return air temperature is above the adjustable
limits, alarm code 40 will be displayed but not stored
in memory for recall.

CS8500 Troubleshooting

1. Make sure 24VAC is supplied to the CS8500.
2. Check communication cable wiring.
3. Verify that the sensor data from the zone
sensor display matches the Prodigy Unit
Controller display.
4. For the M1 unit controller (IMC), use the IMC
MODE TEMP switch to display the data.
5. For the M2 unit controller use the DATA >
SENSORS menu to display the data.
For the M3 Unit Controller use the DATA > IN/
6.
OUTPUT > SENSORS > NETWORK.
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