Lennox Core Unit Controller Setup Manual page 55

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