IComfort Equipment Interface Module Installation And Setup .

Conventional Terminal ConnectionsTable 9. Status LED (Green)Table 8. Conventional TerminalsLabelDescriptionFunctionW11st - stage heat output (1st stage gas heat output when configured as IFCand 1st stage electric heat output when configured as AHC.W22nd - stage heat output (2nd stage gas heat output when configured as IFCand 2nd stage electric heat output when configured as AHC.W33rd - stage heat output (3nd stage electric heat output when configured asAHC)GIndoor blower control (continuous fan) (monitoring only). G input may beconnected to IAQ devices such as LVCS, HRV or ERV to turn the indoorblower on and off.Y22nd - stage compressor outputY11st - stage compressor outputDS24VAC dehumidification signal output. The DS terminal is powered whenthere is not a dehumidification call.CClass II, 24VAC transformercommonRClass II. 24VAC transformerpowerH24VAC humidifier signal outputOHeat pump reversing valve(24VAC cool)BHeat pump reversing valve(24 VAC heat)Green LEDFunction / DescriptionSteady OnRemains steady ON until the device sends its start-up message.Blinks 3 second OFF and 1second ONSoft disable stateBlinks 2 second ON and 2second OFFService is being provided (W, Y or G relay isON, or G input ONBlinks 1 second ON and 1second OFFAlarm is present.Soft DisableSoft disabling is when the iComfort thermostat finds an unknown controlsuch as a indoor or outdoor unit control, iHarmony zoning system orEquipment Interface Module (EIM) on the system communication bus. Thethermostat sends the unknown control a message to go into soft disablemode until component is properly configured.R and C terminals are used to receivepower from the indoor unit and capableof provid ing the power to the EIM and allthe associated loads. The R power input uses a 3A fuse (Lennox part number25J4901.The iComfort thermostat will not show any code for a soft disabled control.When soft disabling occurs only the control that has been disabled willdisplay the blinking LED status. In this case, the control blinks threeseconds OFF and one second ON.Use the following procedure if the equipment interface module is displayingthe soft disable code.Used as reversing valve output for heatpumps. The EIM uses a single-pole dualthrow relay to generate O and B signals.Normally the O output is open and B output at 24VAC during heating calls. Duringcooling calls O is 24VAC and B open. Withrelay de- energized 24VAC is present on Oterminal.When power off/ or control reset, 24VACpower shall not be present on the O terminal.1. Confirm proper wiring between all devices such as thermostat, EIM,indoor and outdoor unit).2. Cycle power to the control that is displaying the soft disable code.3. Touch the Lennox icon on the thermostat home screen and hold untilthe installer warning screen appears.4. Touch yes to continue.LED IndicatorsThis control has two green LED to indicate status and communication 5. Touch Setup and then confirm to continue.activity One LED is labeled Status and the other is labeled RSBUS.6. Use this Thermostat? Touch press here to continue.RSBUS LED7. Touch the next button to continue past the next three screens.The RSBus LED flashes when information is being communicated over the8. From the System Devices list, touch reset ALL to reset all devices.RSBus.Status LEDThe following table lists all status LED information.9. Touch the confirm button.8The thermostat will reboot and start through the setup process again.

IMPORTANTIf any jumpers were set incorrectly AFTER commissioning wascompleted, then reposition jumpers to correct positions. Re-runningthe commissioning procedure will be required at the iComfort seriesthermostat.iComfort Wi-Fi Commissioning (Conventional Outdoor Unit)Both unit capacity and number of compressor stages are required to beconfigured through the iComfort series thermostat. Once the outdoor unithas been installed and connected to the equipment interface module, go tothe thermostat and start the configuration process.1. From the system devices screen, touch the yes button to add orremove non-communicating equipment.2. A non-communicating device list will appear, select Outdoor UnitType and then touch edit.Figure 6. Adding Conventional Outdoor Unit3. Under Outdoor Unit Type, select the applicable 1 or 2-stage unit. 2. A add/remove equipment screen will appear. Under Outdoor UnitTouch save to continue.Type, select the applicable 1 or 2-stage unit.4. Under non-communicating device list, select Outdoor Unit Capacity 3. Touch either the plus or minus buttons to selected the applicableand then touch edit.Outdoor Unit Capacity. Valid options are 18, 24, 30, 36, 42, 48 and60.5. Touch either the up or down arrows to selected the applicable OutdoorUnit Capacity. Valid options are 18, 24, 30, 36, 42, 48 and 60. Touch 4. Touch save to continue.save to continue.Operating Environment SpecificationsThis completes the configuring of the conventional outdoor unit.The Equipment Interface Module is designed to operate in the followingenvironmental conditions. Operating Temperature Range: 40 F to 176 F (40 C to 80 C). Shipping and Storage Temperature Range: 40 F to 185 F (40 C to85 C). Operating Humidity Range: 10% to 90% non-condensing at 104 F.iComfort S30 Commissioning (Conventional Outdoor Unit)Both unit capacity and number of compressor stages are required to beconfigured through the iComfort series thermostat. Once the outdoor unithas been installed and connected to the equipment interface module, go tothe thermostat and start the configuration process.1. From the equipment found screen, touch the non-communicationequipment location to add non-communicating equipment.9

Unit DimensionsDUAL FUEL WITH DEFROST TEMPERING(EIM, 24VAC Furnace and Communicating Heat Pump)ICOMFORTWI-FIICOMFORTS306” (152mm)iComfort SeriesThermostatEquipment InterfaceModel (EIM)NOTE: iComfort Wi-FiThermostat with firmwareversion 2.1 or higher)FurnaceiComfort -enabledHeat Pump(Outdoor Unit)8” (203mm)Wiring Legend4-wire communicating1-5/8” (42mm)24VAC conventionalOutdoor Sensor(Included withHeat Pump)Figure 7. Unit DimensionsDuel-Fuel OperationsTo use the EIM in dual-fuel mode, the following equipment combinationsand configuration is required.Defrost Air Tempering Kit (67M41) will be required. The included DT1discharge temperature probe is inserted in the furnace air outlet betweenthe furnace and the indoor coil to keep the furnace from overheating thecoil which would cause heat pump high pressure tripping during the defrostcycling. The DT1 is only needed with non-communicating furnaces and isnot required for air handlers.Wiring example for the DT1 Discharge Temperature Probe is in “Figure 14.Dual-Fuel - Conventional Furnace with Conventional Heat Pump” on page12.10Defrost Tempering(Available only iffurnace is variablecapacityor multi-stage)OptionalFigure 8. EIM, Conventional Furnace and iComfort Heat Pump

Table 10. Wiring DiagramsDUAL FUEL WITH DEFROST TEMPERING(EIM, Communicating Furnace and 24VAC Heat PumpICOMFORTWI-FIICOMFORTS30iComfort SeriesThermostatiComfort ot Water Coil e 17 on page 14Accessories - Dehumidifiers, humidifiers, HEPA BypassFilter (HRV / ERV)ConventionalNot applicableFigure 18 on page 15ConventionalFigure 19 on page 16Accessories - EDAHumiditrolandLVCSVentilation ConventionalControlEquipment InterfaceModel (EIM)* 24VAC conventional air handler or CBX32MV(-6) / CBX40UHV used as 24VAC conventional.NOTE: iComfort Wi-FiThermostat with firmwareversion 2.1 or higher)Wiring Legend 4-wire communicating24VAC conventional24VACConventional HeatPump(Outdoor Unit)ICOMFORT SERIESTHERMOSTATX2658 OutdoorSensor RequiredFigure 9. EIM, Conventional Furnace and Conventional Heat PumpField WiringTable 10. Wiring DiagramsSystemIndoorUnitOutdoorUnitDiagramAir ConditionerConventionalConventionalFigure 10Heat PumpConventionalConventionalFigure 11 on page 12Dual FuelConventionaliComfortFigure 12 on page 12Dual FueliComfortConventionalFigure 13 on page 12Dual FuelConventionalConventionalFigure 14 on page 12Dual Fuel withiHarmonyiComfortConventionalFigure 15 on page 13Baseboard HeatConventional*iComfortFigure 16 on page 14REMOVE JUMPER BETWEEN R AND W2IF PRESENT. IT MAY CAUSEERRONEOUS ALERT CODE 125.Figure 10. Conventional Furnace or Air Hander with Conventional Air Conditioner11

ICOMFORT SERIESTHERMOSTATICOMFORT SERIESTHERMOSTATREMOVE JUMPER BETWEEN R AND W2IF PRESENT. IT MAY CAUSEERRONEOUS ALERT CODE 125.Figure 13. Dual-Fuel - iComfort Furnace with Conventional Heat PumpFigure 11. Conventional Air Hander with Conventional Heat PumpICOMFORT SERIESTHERMOSTATICOMFORT SERIESTHERMOSTATREMOVE JUMPER BETWEEN R AND W2IF PRESENT. IT MAY CAUSEERRONEOUS ALERT CODE 125.IF THERE IS A JUMPER INSTALLEDBETWEEN R AND W2 ON INDOOR UNIT,THEN REMOVED. IF NOT REMOVE ITMAY CAUSE ERRONEOUS ALERTCODE 125.REMOVE JUMPER BETWEEN R AND W2 IFPRESENT. IT MAY CAUSE ERRONEOUS ALERTCODE 125.Figure 12. Dual-Fuel - Conventional Furnace with iComfort Heat Pump or AirConditionerFigure 14. Dual-Fuel - Conventional Furnace with Conventional Heat Pump12

ICOMFORT SERIESTHERMOSTATFigure 15. Dual-Fuel - iComfort Furnace, iHarmony Zoning with Conventional Heat Pump13

ICOMFORT SERIESTHERMOSTATFigure 16. Baseboard Heat - Conventional Air Handler (CBX32MV(-6) or CBX40UHV) with either a iComfort Air Conditioner or Heat PumpREMOVE JUMPER BETWEEN R AND W2IF PRESENT. IT MAY CAUSEERRONEOUS ALERT CODE 125.Figure 17. Hot Water Coil Heat with Aquastat Blower Control - Conventional Air Handler (CBX32MV(-6) or CBX40UHV)14

ICOMFORT SERIESTHERMOSTATREMOVE JUMPERBETWEEN R ANDW2 IF PRESENT.IT MAY CAUSEERRONEOUS ALERTCODE 125.Figure 18. Optional Accessories with Conventional Outdoor Unit15

ICOMFORT SERIESTHERMOSTATREMOVE JUMPER BETWEEN R AND W2IF PRESENT. IT MAY CAUSEERRONEOUS ALERT CODE 125.Figure 19. Optional Accessories with Conventional Indoor Unit16

Alert Codes and TroubleshootingError codes are transmitted to the thermostat. No codes are stored in the EIM.Table 11. Alert Codes and TroubleshootingAlert Code10PriorityConditionCriticalApplicable SystemComponent(s)All iComfort seriesthermostats, air handler,furnace, outdoor unit, EIMand iHarmony.Alert TextComponent or System Operational Stateand Troubleshooting TipThe iComfort Series Thermostats when NOT in con figuration modehas detected an unknown device. Typically the thermostat will send acommand to the unknown device and place it in a soft disable state.The soft disable control will indicate so as follows: On air handler, furnace and outdoor controls, the state is displayedThe thermostat hasby double horizontal lines on sev en-segment display.found an unknown device on the system. On the damper control module or equipment inter face equipment,the green LED will blink three sec onds on and one second off.How to clear the alert codeClear alert code by reconfiguring the systemCycling power to the soft disabled control may clear the condition. Ifcycling power does not clear the soft disabled state then replace control.iComfort Series Thermostats did not find an indoor unit. Make surethere is an iComfort indoor unit on the system. Check R, i , i- and C connections and voltages. Ohm wires and cycle power.12CriticalAll iComfort seriesthermostats, furnace, EIM orair handlerThe thermostat cannotfind an iComfort indoor unit Check for voltage and missing component. Verify that equipment interface module is configured as air handleror furnace when used with a non-com municating indoor unit.Automatically clears whenthe system detects that theissue no longer exists. Go to menu advance settings view dealer control center equipment and press reset all equipment. This will allow the systemto auto-detect any iComfort components attached. Replace indoor unit control if there is no response.System component (device) is unable to communi cate. This may indicate the existence of other active alert codes.105CriticalAll iComfort seriesthermostats, furnace, airhandler, outdoor unit, EIM oriHarmonyA system componenthas lost communicationwith the system. In most cases errors are related to electrical noise. Verify that highvoltage power is separated from the low voltage communicationwires. Check for incorrectly wired or loose connections be tween systemcomponents (devices). Check for a high voltage source of noise close to the system.17Automatically clears whenthe system detects the issue no longer exists.

Table 11. Alert Codes and TroubleshootingAlert CodePriorityConditionApplicable SystemComponent(s)Alert TextComponent or System Operational Stateand Troubleshooting TipHow to clear the alert code This alert code may indicate transformer overload ing. Check the voltage and line power frequency. Check the generator operating frequency, if the system is runningon back-up power. Correct voltage and frequency problems.114Moderate /CriticalFurnace, air handler, EIM orIHarmonyThere is a frequency /distortion problem withthe power to a specificsystem component. System will resume normal operation five seconds after faultrecovered. All applicable system component outputs are dis abled – moderatecondition.Automatically clears whenthe system detects the issue no longer exists. After 10 minutes, the priority condition is escalated – criticalcondition. Damper control module will operate in central mode only until propervoltage is restored or frequency dis tortion is resolved – moderatecondition.115120CriticalFurnace, air handler or EIM Check and correct voltage.Primary 24VAC powerto a system compo nent Check for additional power-robbing system compo nents (devices)control is lower than theconnected to system.required range of 18 to This alert code may require the installation of an ad ditional or larger30VAC.VA transformer.ModerateAll iComfort seriesthermostats, furnace, airhandler, outdoor unit, EIM oriHarmonyThere is a delay in thesystemcomponentresponding to the system.Typically this alert code does not cause any opera tional issues and willclear on its own. This alert code is usually caused by a delay in the outdoor unitresponding to the thermostat. Check all wiring connections.Automatically clears whenthe system detects the issue no longer exists.Automatically clears afteran unresponsive systemcompo nent (device) responds to any in quiry.System component has lost communication with the thermostat. Check the wiring connections.124125CriticalCriticalAll iComfort seriesthermostats, furnace, airhandler, outdoor unit, EIM oriHarmonyAll iComfort seriesthermostats, furnace, airhandler, outdoor unit, EIM oriHarmonyThe thermostat has lost Ohm wires.communication with asystem compo nent for Cycle power.more than three min- Check voltage at component.utes.This alert code stops all associated system operations and waits fora heartbeat message from the system component that is not communicating.There is a control hardware problem. Replace the control if the problem prevents opera tion and ispersistent.There is a hardwareproblem on a system Damper control module will remain in non-zone mode (all damperscomponent control.open) for five minutes after priori ty condition no longer exist. Remove jumper if present on indoor unit between Rand W2 ifequipment interface module is in use.18Automatically clears aftercom munication is re- established with applicable system component (de vice).Automatically clears 300sec onds after the is sue nolonger ex ists.

Table 11. Alert Codes and TroubleshootingAlert CodePriorityConditionApplicable SystemComponent(s)Alert TextComponent or System Operational Stateand Troubleshooting Tip Configuration jumper missing on equipment inter face module.130ModerateEIMAir handler jumper ismissing. Install the missing jumper.NOTE:131132180CriticalCriticalCriticalAll iComfort seriesthermostats, furnace, airhandler, outdoor unit, EIM oriHarmonyAir handler, EIM oriHarmonyFurnace, air handler or EIMSystemcomponentcontrol parameters arecorrupted.This is applicable in non-communicating appli cations only). Replace the system component control if heating or cooling is notavailable. Try resetting the thermostatSystemcomponent Recycle power.control software is cor If failure re-occurs, replace the system component control.ruptedIn normal operation after system component control recognizes sensors, the alarm will be sent if valid tem perature reading is lost. Compare outdoor sensor resistance to temperature / resistancecharts in unit installation instructions.The thermostat hasfound a problem with Replace sensor pack if necessary.a system component’soutdoortemperature At the beginning of (any) configuration, furnace, air- handler controlor equipment interface module will detect the presence of thesensor.sensor(s).How to clear the alert codeAutomatically clears afterthe missing or incor rectlyinstalled jumper is installedor corrected.Will automatically clearwhen sys tem component(device) passes memoryself-test or system component control is re placed.Manual system power resetis re quired to recover fromthis alert code.Automatically clears uponcon figuration, or sensingnormal values. If detected (reading in range), appropriate feature will be set as‘installed’ and shown in the ‘About’ screen.Compare discharge temperature sensor resistance to temperature /resistance charts in system component installation instruction. Replace discharge air sensor if failed.310ModerateFurnace, air handler, EIM oriHarmonyThere is a dischargeair temperature sensorissue. If applicable, iHarmony will operate in non-zone mode (all dampersopen).NOTE:345347CriticalCriticalAir handler, EIM or heatpumpThe O relay on the system component hasfailed. Either the pilotrelay contacts did notclose or the relay coildid not energize.Furnace, air handler or EIMThe Y1 relay on the applicable system component has failed. Eitherthe pilot relay contactsdid not close or therelay coil did not energize.Automatically clears 30seconds after condi tion isdetected as recovered orafter system restart.Confirm there is no short or open circuits in the iComfortthermostat connections to any of the other components inthe communication system.Possible O relay / stage 1 failure. Pilot relay contacts did not close or the relay coil did not energize. Replace system component (device) control. If error is applicable to the XC/XP 25, the outdoor control will needto be replaced.Automatically clears afterthe fault recovered following reset. System operation will stop. Possible Y1 relay / stage 1 failure. Pilot relay contacts did not close or the relay coil did not energize. There is no input back to the applicable system component control.19Automatically clears after reset and Y1 inputsensed.

Table 11. Alert Codes and TroubleshootingAlert Code380PriorityConditionModerate /CriticalApplicable SystemComponent(s)EIMAlert TextInterlock relay failure(IFC or AHC mode on ly).381Moderate /CriticalEIMInterlock relay stuck(IFC or AHC modesonly)382ModerateEIMRelayW1fa

The Equipment Interface Module (EIM) is used with an iComfort series thermostat (iComfort Wi-FI or iComfort S30) using the R, i , i-, and C terminals. The EIM is the interface between conventional (non-iComfort) HVAC equipment and iComfort HVAC equipment. T