Lennox Core Unit Controller

55
Table 12. CORE Control System Unit Parameters
Control
Parameter
No
Screen Name
Parameter Short
Description
Control Value
Units Description
Min. Default Max.
109
SMOKE ALARM
CONTROL
Smoke Alarm
Control
0 0 13 Option
Smoke alarm control options.
• 0 = Blower off, exhaust fan off and
fresh air damper closed.
• 2 = Blower off, exhaust fan on and
fresh air damper closed.
• 9 = Blower on, exhaust fan off and
fresh air damper opened.
• 10 = Blower on, exhaust fan on and
fresh air damper closed.
• 11 = Blower on, exhaust fan on and
fresh air damper opened.
110
ERR TIME OFF
DELAY
Error Time Off
Delay
64 300 1800 Seconds Off time delay if a “no-run” error occurs.
111
COOL STAGING
OPTION
Cooling Staging
Option
0
Default may
be altered at
factory test.
4 Option
Cooling staging options:
• 0 = No cooling operation
• 1 = Wired thermostat operation,
Two cooling stages and units with
Economizers
> Y1 = Free Cooling,
> Y2 = Adds all mechanical
stages.
• 2 = Wired thermostat operation.
Two cooling stages and Units with
Economizers
> Y1 - Free Cooling
> Y2-addsrststageof
mechanical.
• 3 = Wired thermostat operation.
Three cooling stages.
> Y1only-rststage,
> Y2 only - second stage,
> Y1+Y2 - third stage.
NOTE: Units with Economizers Y2 only
adds rst stage of mechanical,
Y1+Y2 adds rst and second
stage of mechanical.
• 4 = Discharge air control. Up to four
stages.
Block 5 Miscellaneous Parameters
112
HEAT STAGING
OPTION
Heating Staging
Option
0 2 2 Option
Heating staging options:
• 0 = No heating operation.
• 1 = Discharge air control with up to
four stages.
• 2 = Thermostat operation.
113
EN RET AIR TMP
LMT
Enable Return Air
Temperature Limit
0 0 1 Option
• Enables return air temperature limit
option.
• Return air limits may be used
for limiting zone temperatures.
Continuous fan operation
recommended.
114
COOL RET AIR
LIMIT
Cooling Return
Air Limit
60 65 80 °F
• Return air limit for cooling. If the
return air cooling limit is exceeded,
the cooling demands are interrupted.
• Parameter 113 must be set to 1 to
enable.