Lennox Core Unit Controller Setup Manual page 59

Control
Parameter Screen Name
No
HEAT STAGE4
151
DIFFER
AUTO CHGOVR
152
DEADBND
AUTO CHGOVR
153
DELAY
OCC BLOWER
154
MODE
FREECOOL
155
LOCKOUT SP
FRESH AIR
156
HEAT SP
FAH STAGE
157
DEADBAND
FAH MIN CYCLE
158
TIME
FREE COOL
159
SUPPLY SP
ECON FREECL
160
TEMP SP
ECON FRCL
161
TMP OFFSET
ECON FREECL
162
ENTH SP
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
Heating Stage 4
0
Differential
Automatic
Changeover 2
Deadband
Automatic
Changeover 1
Delay
Occupied Blower
Mode
Free Cooling
30
Lockout Set Point
See CORE System Application Guide for further details and to change the fresh air heat (FAH) set point. Modify the
set point only using the method described in the reference section.
Fresh Air Heating
3
Stage Deadband
Fresh Air Heating
Minimum Cycle 120
Time
Free Cooling
45
Supply Set Point
Economizer
Free Cooling
40
Temperature Set
Point
Economizer
Free Cooling
0
Temperature
Offset
Economizer Free
Cooling Enthalpy 10
Set Point
Control Value
Default Max.
2 3
3 10
Default may
be altered at 15 Minutes
factory test.
AUTO-
CYCLES
30 60
10 15
480 1800 Seconds
55 65
60 75
10 40
12 19
59
Units Description
• Heating stage 4 differential
temperature. Used only with room
sensor applications.
°F
• Differential temperature must
greater than or equal to Parameter
150.
• Minimum auto changeover dead-
band temperature. Dead band
must be greater than or equal to
°F
Parameter 142 plus Parameter 143.
• Used in room sensor applications.
Auto changeover time delay. Delay
between heating and cooling modes.
Blower control option for room sensor
applications during occupied periods.
Auto Cycle: Blower cycles with
•
demand
On-Continuous 1: blower is on
•
with either the occupancy sensor
or occupancy schedule indicates
occupied.
• On-Continuous 2: Blower is on only
when both the occupancy sensor
and occupancy scheduler indicates
Option
occupied.
• On-Continuous 3: lower is on only
when both the occupancy sensor
and occupancy scheduler indicates
occupied. in addition, blower will be
on a minimum of 25% of the time
when occupancy scheduler indicates
occupied by the occupancy sensor
indicates not occupied. The 25%
minimum is achieved by turning
blower on for 30 minutes and off for
90 minutes.
• Locks out free cooling when outdoor
temperature is below the set value.
°F
• Setting value to 29°F disables free
cooling lockout.
°F Fresh Air Heating stage dead-band.
Fresh Air heating minimum cycle time.
Economizer modulates dampers to
maintain supply air temperature (RT6) at
°F this set point during free cooling. DACC
reset applies. See Parameter 207 -
Parameter 201
Outdoor Air Temperature is less than
Parameter Set Point between 41-75°F,
°F or when Outdoor Air temperature is less
than Return Air Temperature between
0-40°F.
Economizer Free Cooling Temperature
°F
Offset
Economizer Free Cooling Enthalpy Set
mA
Point