14
M3 Unit Controller - Setting Return Air
Temperature Limits
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 M3 unit controller which is located
inside the 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
Go to: SETTINGS > RTU OPTION > EDIT
PARAMETER = 115 (HEAT RET AIR LIMIT)
If return air temperature is above the adjustable lim-
its, alarm code 40 will be displayed but not stored in
memory for recall.
Menu
Select the three lines in the upper right-hand corner
of the home screen to access the menu. Selectable
NOTE: Refer to the included user guide for more
details on the following menu selections.
• Notications - When a system error or reminder
occurs, a pop-up screen will appear indicating the
condition. (See user guide for details.)
• Performance Reports (only available when
“Operation with Smart Hub” is set to OFF.) (See
user guide for details.)
NOTE: Smart Hub reference is concerning Central
Hub
• Edit Schedule (only available when “Local
Scheduling Function” is set to ON.) (See user
guide for details.)
• Owner Settings (See user guide for details.)
• Technician Settings (See the following section
for details).
Technician Settings
During initial power up of the CS8500, the technician
option must be selected and a address set before
you can proceed. Use either the minus/plus buttons
or numeric keypad to enter the address. After the
S-Bus address is set, press the back button to return
to the technician settings menu.
NOTE: If you need to access the technician
settings option in the future, go to the home
page, press menu > technical settings and
enter technician PIN code 864. This code
cannot be changed.
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