Lennox Core Unit Controller Setup Manual page 66

Control
Parameter Screen Name
No
246 ALTITUDE STPT
BLR CALIB
247
RAMP RATE
DISPLAY UNITS
258
F/C
FRCL COMP
285
LCKOUT MD
ALGORITHMS
287
ENABLED
LON
305 HEARTBEAT
TIME
FAH REHEAT
313
MODE
MSAV MIN VFD
314
DR OUT
OUT AIR UNIT
317
OPTNS
ENTH HIGH TMP
321
LIMT
ZON SNSR CAL
323
OFFSET
BPC MANUAL
327
RESET
Table 12. CORE Control System Unit Parameters
Parameter Short
Description
Min.
Advanced Airflow
0
Altitude Set Point
Blower Calibration
4
Ramp Rate
Display Unit
(Fahrenheit or
Celsius)
Free Cooling
Compressor 0
Lockout Mode
NOTE: Options for Parameter 287 are not accessible via the CORE Unit Controller user
interface. Options can be set using the Lennox UC software.
Here is an example of the selection options for Algorithms Enable via the Lennox UC Software:
Set bit
0x00000002 Enable Fresh Air Heating (ALGO_FAH)
0x00000004 Enable Fresh Air Cooling (ALGO_FAC)
0x00000008 Enable DACC Return Air Reset (ALGO_DACC_RAT_RESET)
0x00000010 Enable DACC Outdoor Air Reset (ALGO_DACC_OAT_RESET)
Algorithms
0x00000020 Enable DACH Return Air Reset (ALGO_DACH_RAT_RESET)
Enabled
0x00000040 Enable DACH Outdoor Air Reset (ALGO_DACH_OAT_RESET)
0x00000080 Enable Supply Static Pressure Sensor Alarm (ALGO_LO_STATIC_PRESSURE_
ALARM)
0x00000100 Enable Low Outdoor Temp override of DCV/OAC operation (ALGO_LO_OAT_
DCV_OAC_OVERRIDE)
0x00000200 Enable High Outdoor Temp override of DCV/OAC operation (ALGO_HI_OAT_
DCV_OAC_OVERRIDE)
0x00000800 Enable Free Cooling Blower Stage Up
.
LonTalk Heartbeat
0
Time
Fresh Air Reheat
0
Mode
MSAV Minimum
10
VFD Drive Output
Outdoor Air Unit
0
Options
Enthalpy High
45
Temperature Limit
Zone Sensor
-5
Calibration Offset
Building Pressure
Control Manual 0
Reset
Control Value
Default Max.
650 25000
10 40
FAHRENHEIT
or
CELSIUS
2 2
Description
100 10,000
0 3
33 50
0 2
75 85
0 5
50 100
66
Units Description
Applicable to Standard Efficiency 3- to
Feet
6-ton units only.
Applicable to Standard Efficiency 3- to
%
6-ton units only.
Option Temperature unit of measurement.
• 0 = Disable Free Cooling Low
Ambient Compressor Lockout
(default).
• 1 = Lockout Compressor whenever
Option
the outdoor air is suitable regardless
of outdoor air temperature.
• 2 = Enable Free Cooling Low
Ambient Compressor Lockout.
Heartbeat configuration proprieties define
Seconds how often a network variable update is
transmitted from a sending node.
• 0 = Disabled
• 1 = Allowed, must be occupied
Option
• 2 = Allowed, blower must be
energized and in occupied mode.
• 3 = Allow. No conditions apply.
The CORE Unit Controller will ensure
that active VFD drive output is equal or
greater than Minimum VFD drive output.
% If conversion from CFM setting to VFD
drive yields lower value. The system will
use Minimum VFD drive output instead
output.
This Parameter is applicable in Zone
Option Sensor mode (i.e. not applicable for local/
remote thermostat mode).
When in Enthalpy mode, the outdoor air
suitability (OAS) will be set only if the
°F
outdoor air temperature is lesser than this
Parameter set point.
This setting is applicable to local
°F
temperature sensor only.
Manual reset value. This Parameter
% defines the default outdoor air damper
position