133
Table 63. M3 Control Parameters
Control Parameter
DescriptionUnits
Control Value
No DescriptionUnitsMax.DefaultMin.
Parameter Short
Description
Screen Name
285
FRCL COMP LCKOUT
MD
Free Cooling
Compressor Lockout
Mode
0 2 2 OPTION
0 = Disable Free Cooling Low
Ambient Compressor Lockout
(default).
1 = Lockout Compressor
whenever the outdoor air is suit
able regardless of outdoor air
temperature.
2 = Enable Free Cooling Low
Ambient Compressor Lockout.
287
ALGORITHMS
ENABLED
Algorithms Enabled
NOTE: Options for parameter 287 are not accessible via the M3 unit controller user
interface. Options can be set using the Lennox UC software.
Set Bit Description
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)
0x00000020 Enable DACH Return Air Reset (ALGO_DACH_RAT_RESET)
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
Here is an example of the selection options for Algorithms Enable via the Lennox
UC Software.
305 LON HEARTBEAT TIME LonTalk Heartbeat Time 0 100
10,00
0
Seconds
Heartbeat configuration propriet
ies define how often a network
variable update is transmitted
from a sending node.
313 FAH REHEAT MODE Fresh Air Reheat Mode 0 0 3 Option
0 = Disabled
1 = Allowed, must be occupied.
2 = Allowed, blower must be en
ergized and in occupied mode.
3 = Allow. No conditions apply.
314
MSAV MIN VFD DR
OUT
MSAV Minimum VFD
Drive Output
10 33 50 %
The M3 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 out
put instead output.
317 OUT AIR UNIT OPTNS Outdoor Air Unit Options 0 0 2 Option
This parameter is applicable in
Zone Sensor mode (i.e. not ap
plicable for local/remote thermo
stat mode).
321 ENTH HIGH TMP LIMT
Enthalpy High
Temperature Limit
45 75 85 °F
When in Enthalpy mode, the
outdoor air suitability (OAS) will
be set only if the outdoor air
temperature is lesser than this
parameter set point.
323
ZON SNSR CAL OFF
SET
Zone Sensor Calibration
Offset
-5 0 5 °F
This setting is applicable to local
temperature sensor only.
NOTE: Parameter 323 is only
available in firmware version
8.01 or later.
327 BPC MANUAL RESET
Building Pressure
Control Manual Reset
0 50 100 %
Manual reset value. This param
eter defines the default outdoor
air damper position
328 BPC PID P CONST
Building Pressure
Control PID P Constant
0 100 127 Count BPC PID Proportional Constant
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