Heating Stages - Lennox PRODIGY2.0 Application Manual

Number of
Compressors
1
2
(or two stage compressor)
3
4
CP1 = Compressor 1, CP2 = Compressor 2, CP3 = Compressor 3, CP4 = Compressor 4. *Assumes outdoor air is suitable for cooling.
Table 4. LC/LG 036U, 048U, 060U and 074U — Thermostat Mode Operation Default
Number of
Compressors
1
CP1 is a Variable Speed Compressor. *Assumes outdoor air is suitable for cooling.
Table 5. LC/LG 036U, 048U, 060U and 074U — Thermostat Mode Operation Default
Number of
Compressors
Y1 Demand
1 CP1 @ 60%
CP1 is a Variable Speed Compressor. *Assumes outdoor air is suitable for cooling.
Min Hz is the lowest speed at which the compressor can run.
2.1.2.

Heating Stages

The M3 unit controller default thermostat operation is for two heating stages. See table 6 for gas heat units and table 7 for
electric heat units.
The M3 unit controller allows three different staging.
Go to SETTINGS > RTU OPTION > EDIT PARAMETER =112 (HEAT STAGING OPTION)
Available sections are:
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 four 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)
•
Energence 3 to 12-1/2 ton units use up to two stages in room sensor control mode.
•
Specially equipped 4 to 6 ton LG units can support four stage gas heat by utilizing an electromechanical control,
external to Prodigy.
•
Energence LG 13- to 25-ton units with two gas valves, each having two stages, and can support up to four stage
operation in Room Sensor mode. See table 8.
Table 3. Thermostat Mode Operation
(Three Cooling Stages Parameter 111)
No Economizer
Y1 Demand Y2 Demand Adds Y3 Demand Adds
CP1 NO CHANGE
CP1 CP2
CP1 CP2
CP1 + CP2 CP3
(Two Cooling Stages Parameter 111)
No Economizer
Y1 Demand
CP1 @ 60%
(Three Cooling Stages Parameter 111)
No Economizer
Y2 Demand
CP1 @ 100%
Y1 Demand
NO CHANGE Free Cool
NO CHANGE Free Cool
CP3 Free Cool
CP4 Free Cool
Y2 Demand Y1 Demand
CP1 @ 100%
Y3 Demand Y1 Demand
CP1 @ 100% Free Cool
10
With Economizer*
Y2 Demand Adds Y3 Demand Adds
CP1
CP1
CP1
CP1 + CP2
With Economizer*
Y2 Demand
Free Cool CP1 @ 60%
With Economizer*
Y2 Demand
CP1 @ 60%
CP1
CP2
CP2
CP3
Y3 Demand
CP1 @ 100%