Heating Stages; System Mode - Room Sensor Backup Mode Set Points; Network Control Panel; Room Sensor Back-Up Modes - Lennox Prodigy 2.0 Application Manual

2.1.2.

Heating Stages

The M3 Unit Controller default thermostat operation is for two heating stages. See table 3 for gas heat units and table 4 for
electric heat units.
The M3 Unit Controller allows three different staging options:
Go to SETTINGS > RTU OPTION > EDIT PARAMETER =112 (HEAT STAGING OPTION)
•
Option 0. No heating operation
•
Option 1. Discharge Air Control with up to four stages. Discharge Air Control Heating (DACH) option automatically
cycles up to 4 stages of heating to maintain a discharge air temperature within specific tolerances of discharge air
control heating set point (occupied or unoccupied). See Parameters 174 and 175.
•
Option 2. Thermostat operation (default)
No. of Heat Sections
1
1
2
2
No. of Heat Sections
1
1
2
2
2.2.

System Mode - Room Sensor Backup Mode Set Points

This allows the M3 Unit Controller to use internal set points and input from a room sensor to operate the unit. An additional
thermostat or energy management system is not required.
2.2.1.

Network Control Panel

The set points can also be adjusted using the optional network control panel (NPC). When a NCP is installed, the set points
are determined by the its schedule. The NPC communicates with the M3 Unit Controller via the L Connection network bus.
Internal M3 Unit Controller set points are used only if network communication is interrupted.
The room sensor is wired directly to each unit P298-6 and P298 -7 (marked GND and TMP on the Field Wiring Termination
Plugs). The room sensor wiring diagram key number is A2.
NOTE - To select either BACnet or LonTalk, Configuration ID 1, position 5 needs to be set to either B for BACnet or L for
LonTalk.
Internal set points can be adjusted using the user interface on the M3 Unit Controller. In room sensor mode, during the
occupied or unoccupied time period, the default M3 Unit Controller internal heating and cooling (occupied and unoccupied)
set points as reference in paragraph 2.2.3.
Use Parameter stage differential and dead­band options to adjust set points in room sensor mode.
2.2.2.

Room Sensor Back-Up Modes

Go to SETUP > NETWORK INTEGRATION wizard to configured a back up mode option. Use table 5 to follow the wizard
path to the backup mode setting.
Table 3. Default Thermostat Mode Operation (Gas Heat)
Gas Valve
(1) 1 Stage
(1) 2 Stage
(2) 1 Stage
(2) 2 Stage
Table 4. Default Thermostat Mode Operation (Electric Heat)
Stages Per Section
1
2
1
2
W1 Demand
Gas Valve 1
Low Rate
High Rate - Both Valves
Low Rate - Both Valves
W1 Demand
Stage 1
Stage 1
High Rate - Both Sections
Low Rate - Both Sections
Page 8
W2 Demand
Gas Valve 1
High Rate
High Rate - Both Valves
High Rate - Both Valves
W2 Demand
Stage 1
Stage 2
High Rate - Both Sections
High Rate - Both Sections