Lennox PRODIGY2.0 User Manual

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13.5.2.5. Tuning
In the event that the PID loop requires tuning, the following two methods are recommended depending on the severity of
the problem:
1. In most cases the parameters will only need a small adjustment. In that case use the following table as a basic guide.
Table 39. Tuning
Change Desired
Parameter 31
PID P
Parameter 32
PID I
Parameter 33
PID D
Reduce Response time Increase Decrease Decrease
Reduce Overshoot Decrease Increase Increase
Reduce Settling Time  Decrease Decrease
Reduce Offset (steady state error) Increase Decrease 
2. If method 1 adjustment does not stabilize the system, you may use the following tuning method:
NOTE: To use this method the system must be allowed to operate at the manual reset value (% output) without damaging
the system.
A Set the parameters 31, 32 and 33 blower PID constants to 0 (OFF).
B Start system. Analog output value will be at the parameter 41 (SUPPLY MANUAL RESET) value (%).
C Monitor system. System should be stable. If system is not stable at this point check for other problems. Adjusting
the PID parameters will not solve this problem.
D If system is stable, gradually increase the parameter 31 (SUPPLY PID P CONST) until system starts oscillating
(moving above and below set point, continuously).
E Reduce the parameter 31 (SUPPLY PID P CONST) to 4070% of the value set in step D.
F Gradually start adding some parameter 32 (SUPPLY PID I CONST) by setting to 127 and reduce setting until the
steady state error (offset) is reduced to an acceptable level.
G If necessary, increase the parameter 33 (SUPPLY PID D CONST) to reduce overshoot. Use of parameter 33 (D)
can increase settling time and/or lead to instability.
NOTE: It is recommend that in most cases it is best not to use any parameter 33 (SUPPLY PID D CONST).

Lennox PRODIGY2.0 Specifications

General

Brand	Lennox
Model	PRODIGY2.0
Category	Controller
Language	English

Summary

1. Prodigy 2.0 – M3 Unit Controller Description

1.3. M3 Unit Controller Layout and Connections

Details the physical layout and connection ports of the M3 Unit Controller.

2. Main Controller Operation

2.1. Control Type - Thermostat

Describes system operation modes via thermostat, room sensor, or network.

2.1.1. Cooling Stages

Explains the five cooling staging options and configurations.

2.1.2. Heating Stages

Details heating staging options for gas and electric units.

3. Unit Component Operation

3.1. Compressor Protection and Delays

Covers minimum run-time, off-delay, and on-delay for compressors.

3.1.1. Compressor Minimum Run-Time and Off-Delay

Explains compressor run-time and off-delay settings and defaults.

3.1.5. High Pressure Switches (S4, S7, S28 and S96)

Covers high-pressure switch operation and lockout logic.

3.1.6. Low Pressure Switches (S87, S88, S97 and S98)

Explains low-pressure switch function and lockout occurrences.

3.2. Gas Units Burner Protection and Delays

Covers protection mechanisms for gas units, including limits and proof switches.

5. Outdoor Fan Operations

5.3. Low Ambient Conditions (S11, S84, S85 and S94)

Explains fan operation during low ambient conditions.

5.4. Compressor / Fan Configurations

Details compressor and fan configurations by box size.

5.5. Low Ambient Outdoor Fan Control and Cycling

Explains low ambient fan control using pressure switches.

6. Dehumidification Operation

6.1. Supermarket Reheat Operation Settings

Configures Supermarket Reheat operation via thermostat or humidity sensor.

6.2. Humiditrol Dehumidification Operation — (Humiditrol® Reheat)

Details Humiditrol reheat operation based on humidity sensor readings.

7. Increased Dehumidification Operation - Energence Ultra-High Efficiency (3- to 6-ton)

7.2. Increased Dehumidification in Room Sensor Mode

Details increased dehumidification using room sensor and over-cooling limits.

8. Economizer

8.2. Enabling Economizer and Settings

Steps to enable economizer and available configuration types.

8.3. Damper Operation During Free Cooling

Discusses economizer damper operation profiles during free cooling.

8.4. Free Cooling Compressor Lockout Mode and Low Ambient Set Point

Configures compressor lockout and low ambient set points for free cooling.

8.11. Economizer Checkout

Outlines checkout procedures for economizer operation.

9. Demand Control Ventilation (DCV)

9.1. General

Explains using IAQ sensors to control CO2 levels and damper position.

9.2. Default Operation

Details the default IAQ input and damper operation for DCV.

9.3. Maximum and Minimum Demand Control Ventilation Damper Settings

9.4. Parameter Adjustments

10. Outdoor Air Control (OAC)

10.1. General

Explains OAC as an alternative to DCV for modulating outdoor air damper.

11. Building Pressure Control (BPC)

11.1. General

Describes BPC feature for modulating outdoor air damper to hold constant building pressure.

12. Power Exhaust Operation

12.1. General

Explains M3 unit controller's capability to control power exhaust stages.

13. Supply Air Delivery

13.4. Variable Frequency Drive Control

Explains M3 controller compatibility with VFDs for supply blower control.

13.5. Supply Constant Air Volume (CAV) with Zone Bypass Damper Control

Covers CAV unit bypass damper control for static pressure.

13.5.2. Analog Output Control

Explains analog output control using PID for CAV bypass damper.

14. Discharge Air Control

14.1. Cooling

Discusses auto cycling for discharge air cooling set point maintenance.

14.1.1. Discharge Air Control Cooling (DACC) Outdoor Air Temperature Reset

14.1.2. Discharge Air Control Cooling (DACC) Return Air Temperature Reset

14.2. Heating

Covers automatic cycling for discharge air heating set point maintenance.

14.2.1. Discharge Air Control Heating (DACH) Outdoor Air Temperature Reset

14.2.2. Discharge Air Control Heating (DACH) Return Air Temperature Reset

15. Third-Party Zoning

16. BACnet®

16.1. M3 Unit Controller BACnet® Module

Details the optional BACnet module for MSTP network communication.

21. Advanced Airflow System (Smart Airflow™)

21.1. Calibration

Procedure to determine relationship between motor torque and supply airflow.

21.2. Supply Airflow Measurement and Control

Explains how the system measures and controls supply airflow.

22. Sequence of Operation

22.1. Unit Controller Control Modes

Details various control modes available for the M3 unit controller.

22.1.1. Unit Controller In Room Sensor Mode

Explains controller operation using a room sensor for heating and cooling.

22.1.2. Unit Controller In Thermostat Mode

Describes controller operation using a thermostat for heating and cooling.

22.1.3. Operations Common to All Rooftop Units

22.1.3.2. Demand Control Ventilation (DCV)

Explains DCV for controlling outdoor air based on CO2 levels.

22.1.3.3. Fresh Air Tempering (FAT)

22.1.3.4. Discharge Air Cooling Reset Operation

22.1.3.5. Discharge Air Heating Reset Operation

22.2. CAV Units in Single-Zone Applications with a Lennox Room Sensor

Explains controller operation for CAV units with room sensors.

22.2.1. Unit Controller Operation (4-Heat / 4-Cool)

22.2.3. Cooling Demand

Explains compressor staging for maintaining space temperature set point.

22.2.4. Cooling Demand with Economizer

22.2.5. Heating Demand (General Operation)

22.3. CAV Units in Single-Zone Applications — Wired Thermostat or Third-Party Unit Controller

Covers controller operation for CAV units with wired thermostat or third-party controls.

22.3.1. Unit Controller Operation (2-Heat / 2-Cool)

22.3.1.2. Cooling Demand

Details M3 controller's role in activating compressors for cooling demand.

22.3.1.3. Cooling Demand With Economizer

22.3.1.4. Heating Demand (General Operation)

22.3.1.6. Humiditrol Dehumidification Operation - Dehumidification Demand

22.3.1.8. Humiditrol Dehumidification Operation - Cooling and Dehumidification Demand

22.3.2. Discharge Air Temperature Control (4-Heat / 4-Cool)

Explains 4-stage heating/cooling control with thermostats or third-party controllers.

22.3.2.1. Unit Controller Operation

22.3.2.3. Cooling Demand

Covers M3 controller's role in maintaining cooling discharge air temperature set point.

22.3.2.4. Cooling Demand With Economizer

22.3.2.5. Heating Demand (General Operation)

22.3.3. Bypass Zoning Applications (2-Heat / 2-Cool)

Covers controller operation for bypass zoning with 2-stage heating/cooling.

22.3.3.1. Unit Controller Operation

22.3.3.3. Supply Duct Bypass Damper

Describes bypass damper use for supply duct static pressure control.

22.3.4. Bypass Zoning Applications (4-Heat / 4-Cool)

Covers controller operation for bypass zoning with 4-stage heating/cooling.

22.3.4.1. Unit Controller Operation

22.3.4.3. Supply Duct Bypass Damper

Describes bypass damper control for supply duct static pressure.

23. M3 Unit Controller Inputs and Outputs

23.1. General

Overview of M3 unit controller inputs and outputs.

24. M3 User Interface Menu Tree and Display Status Screen

24.1. Menu Tree (Level 1)

Visual representation of the main menu structure.

24.2. Menu Interface Details

24.3. System Status Screen

Shows operating mode, alarms, and network status.

24.3.3. Alarm Status Display

Shows how alarms are displayed, including alarming value and event details.

25. Model Number and Configuration ID 1 and 2

25.2. Configuration ID 1

Details the settings for Configuration ID 1 for various features.

25.3. Configuration ID 2

Explains the settings for Configuration ID 2 related to unit features.

26. M3 Unit Controller Parameters

26.2. Unit Controller PC Software

Recommends PC software for adjusting parameters and saving configuration files.

28. Events and Alarms

28.1. Phase - Voltage Detection

Explains the unit's ability to detect frequency, phasing, and voltage levels.

28.2. M3 Unit Controller Alarm and Event Codes

Lists M3 unit controller alarms and event codes with corresponding actions.