Lennox International Inc SL28003, XP2101, XC2105, XC1702 Smooth Setback Recovery SSR, Rules for SSR

Page 31

Smooth Setback Recovery (SSR)

SSR is an algorithm designed to reach a occupied program

schedule setpoint. The algorithm looks 2 hours ahead for the occupied pro- gram schedule period’s setpoint. If the occupied setpoint requires the sys- tem to turn on (present temperature below the heat setpoint or above the cool setpoint), then SSR will calculate a new setpoint. Once initiated, SSR monitors the change in room temperature and calculates a new setpoint ev- ery 30 seconds. Then SSR provides this new setpoint for the heating and cooling algorithms; the new setpoint will be displayed on the User Interface.

Rules for SSR:

1. SSR is enabled when	enabled
and the program schedule is turned on.

2.When SSR is enabled, then it will check for a new setpoint every 30 seconds.

3.The SSR Target Program Schedule setpoint is always 2 hours ahead.

4.When SSR starts, then the Current SSR setpoint will equal the current program schedule setpoint.

5.When a new program schedule period starts, then the New SSR set- point will equal the new program schedule period’s setpoint, unless there are two or more program periods within the 2 hour window. In this case, SSR will track the highest heat setpoint or the lowest cool set- point found in the 2 hour window.

6.SSR will NOT run during a program schedule HOLD.

7.SSR does NOT look at the current temperature.

8.If the target program heat setpoint is lower than the Current SSR heat setpoint, then the New SSR Heat Setpoint will equal the Current SSR Setpoint.

9.If the target program cool setpoint is higher than the Current SSR cool setpoint, then the New SSR Cool Setpoint will equal the Current SSR Setpoint.

10.The New SSR Setpoint will be displayed on the User Interface.

11.SSR does NOT control the equipment.

12.SSR does NOT turn off Stage Delay Timers.

13.SSR does NOT round the newly rounded setpoint, but the setpoint shown on the user interface is rounded.

14.SSR will NOT change the Temperature Dead band.

15.SSR will not adjust a setpoint to violate the Temperature Dead band.

16.SSR will not overshoot the Target Setpoint.

Page 31

icomfort Wi-Fit 7−Day Programmable Communicating Thermostat

Image 31

Contents CONTROLS INSTALLER’S SYSTEM SETUP GUIDEicomfortt−Enabled Units 2P0912**P506920-01Table of Contents Setting up typical icomfortt systemsPage Outdoor Temperature Sensor option SupportsFigure 1. icomfort by Lennoxt system Installation and Setup Figure 4. Entering Change settingsFigure 3. Settings change tools Dealer NumberTable 1. System setting defaults and range Circulate fan ON time settingFigure 6. Set current time and date Set time and date09 39 am Figure 5. View/edit time and dateFigure 7. Using the HUMIDITY CONTROL TIPS Add or Remove Non−communicating equipmentSystem Add Non−Communicating Outdoor unitFigure 8. Add non−communicating device red settingsHumidifier 5a 5bFigure 9. Add or remove non−communicating device SystemDehumidifier Figure 10. Add or remove non−communicating deviceSystem DehumidifierFigure 11. Adjust communicating device screens Adjust a setting screen communicating devicesFigure 13. Modify device settings Figure 12. Accessing device to modifyG71MPP or SLP98 Furnace Note Figure 14. Adjust a non−communicating device setting Figure 15. Adjust a non−communicating device setting Figure 16. Adjust dehumidification when not using Humiditrol or an auxiliary dehumidifier HUMIDIFICATION modes Humidification and Dehumidification ModesDEHUMIDIFICATION modes Figure 19. Typical tests results screens Use the Tests / Diagnostics featuresFigure 17. Start testing screen Figure 18. Select tests to run screenFigure 21. Equipment parameters screen Equipment, Alerts, DiagnosticsSet up Equipment parameters Figure 20. Testing finished screenFigure 22. Edit equipment details Run DiagnosticsView and clear Installer Alerts Figure 23. Select device and run diagnosticsFigure 26. Cleared alerts screen Figure 25. Cleared alert confirmationView cleared alerts Figure 24. Selecting and viewing alertsHERE Figure 27. Wi−Fi setupSecure Connection Recommended STARTRegistration for online access Registering the icomfort Wi-FitthermostatFigure 28. Change Networks Figure 30. icomfort Wi-FitRegistration screen Wi-FitTher Welcome homeHow Do I Upload a Skin? Figure 31. PC Welcome Screenyes no Access installer program from Home screenFigure 34. Re−configuration process Reconfigure a system2nd Stage Differential where applicable2 Rules for SSR Smooth Setback Recovery SSRHigh Balance Point Heat Pump, Dual Fuel and Balance PointsHeat Pump Balance Points Low Balance PointShut down HP Gas Heat Control Mode Figure 36. Variable Capacity Operation Flow ChartTable 2. Variable Capacity Furnace Operation Staged operationLoad−tracking Variable Capacity FAQs SLP98V only Installer entry Table 3. Adjustable Parameters Table InstallerLock in 2nd stage HP by Outdoor Temp Table 3. Adjustable Parameters Table InstallerAIR HANDLER Table 3. Adjustable Parameters Table InstallerTable 3. Adjustable Parameters Table Installer Gas Heat Airflow SettingsFURNACE Heat Pump Airflow Settings Cooling Airflow SettingsTable 3. Adjustable Parameters Table Installer Table 3. Adjustable Parameters Table Installer Other ParametersTable 4. Adjustable Parameters Table User Filter 1 Timer Table 5. Alert Codes and Troubleshooting Alert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingAlert Table 5. Alert Codes and TroubleshootingTable 5. Alert Codes and Troubleshooting Homeowner Service Alert Codes8Corrective Action / Comments Table 6. Troubleshooting TipsIssue / Problem Possible CauseHigh Balance Point and Low Bal Table 6. Troubleshooting TipsDetermine the actual Software ver Table 6. Troubleshooting TipsDuring the cooling mode the dis Table 6. Troubleshooting Tipsicomfortt Communicating System Wiring Wiring Diagramsicomfort by Lennoxt AIR HANDLER AHC Wiring Diagramsfor use with any icomfort by Lennoxt system Optional Accessories Wiringfor use with any icomfort by Lennoxt system Optional Accessories WiringLVCS Ventilation Control System attached to the PUSHBUTTON TIPS Setting up typical systemsTIPS TIPS Setting up typical systemsT PUMP DUAL FUELTIPS TIPS Setting up typical systemsTIPS TIPS Setting up typical systemsT PUMP UNITSTIPS Replacement Kit Catalog No Table 7. Replacement ControlsREVISION HISTORY icomfortt−Enabled Unit