Related Manuals for Lennox 22X18
Summary of Contents for Lennox 22X18
- Page 1 Equipment Interface Module (EIM) (22X18) 507240-04 11/2022 Installation and Setup Guide Supersedes 9/2022...
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Page 2: Table Of Contents
Minimum Transformer Rating (VA) Non-communicating Air Conditioner or Heat Pump ............ 9 2-Stage HP, 3-Stage Electric heat and Fresh Air Lennox S40 Smart Thermostat Only, EIM and Ventilation Only ......... 9 2-Stage HP, 2-Stage Furnace (with tempering) Duel-Fuel Configurations ................10... -
Page 3: Equipment Interface Module Control Layout
Equipment Interface Module Control Layout HEAT STAGES HEAT PUMP CAPACITY JUMPER PINS STATUS LED JUMPER PINS UNIT TYPE JUMPER PINS ACTIVE COMMUNICATION STATUS LED COMMUNICATION AND OUTDOOR AIR SENSOR POWER TERMINALS CONNECTIONS DISCHARGE AIR SENSOR CONNECTIONS DUAL-FUEL TERMINAL CONNECTIONS OTHERS / VENTILATION DIP SWITCH 3 AMP FUSE NON-COMMUNICATING TERMINALS... -
Page 4: Jumpers Pins, Dip Switch, Connections And Leds
IFC. The Lennox communicating thermostat without the Equipment Interface • Set the number of stages of the compressor when jumper pin selection Module (EIM) will work with Lennox communicating HVAC equipment. is HP. 1. Remove the module cover. HEAT STAGES JUMPER POSITIONS 2. -
Page 5: Heat Pump Capacity Jumper Pin Settings
Others / Vent DIP Switch Settings Table 3. Heat Stage Jumper Pin Settings • Ventilation Only Operation (ERV/HRV) - Set the unit type jumper to Air Handler Heat Furnace Heat Stages Heat Pump Stages VENT and the DIP switch set to OFF (VENT). Stages •... -
Page 6: Dual-Fuel Terminal Connections
EIM and all the associated loads. Class II. 24VAC trans- • The R power input uses a 3A fuse (Lennox former power catalog number 25J49. 24VAC humidifier signal output. -
Page 7: Led Indicators
The following table lists all status LED information. 2. Cycle power to the control that is displaying the soft disable code. Table 7. Status LED (Green) 3. Touch the Lennox icon on the thermostat home screen and hold until the installer warning screen appears. Green LED... -
Page 8: Lennox Communicating Thermostat Commissioning (Conventional Outdoor Unit)
Unit Dimensions If any jumpers were set incorrectly AFTER commissioning was completed, then reposition jumpers to correct positions. Re-running the commissioning procedure will be required at the Lennox communicating thermostat. This completes the configuring of the conventional outdoor unit. Lennox Communicating Thermostat Commissioning (Conventional 6”... -
Page 9: Most Common Configurations
How the EIM is configured is determined by the system components. NOTE: Changing jumper positions after the control has been powered-up Indoor Units: Lennox Communicating Thermostat, EIM and non-communicating Air Handler requires recommissioning for the change to be recognized. Outdoor Unit: Non-communicating Air Conditioner or Heat Pump... -
Page 10: Duel-Fuel Configurations
The DT1 is only needed with non-communicating furnaces and is not required for air handlers. Indoor Units: Lennox Communicating Thermostat, EIM and non-communicating - Furnace Outdoor Unit: Communicating Heat Pump Wiring example for the DT1 Discharge Temperature Probe is in “Figure 20. -
Page 11: Lennox S40 Smart Thermostat Only, Eim (2), Lennox Communicating Furnace, 24Vac Heat Pump And Ventilation (Erv/Hrv)
24VAC conventional X2658 Outdoor Sensor Required Figure 12. Duel Fuel - Lennox Communicating Thermostat, IFC, EIM (2) No-Comm HP and Ventilation 1. Set the EIM 1 Unit Type Jumper to HP. 2. Set the EIM 1 Heat Stage Jumper (see “Table 3. Heat Stage Jumper Pin Settings”... -
Page 12: Field Wiring Diagrams
Field Wiring Diagrams Table 9. Wiring Diagrams EIM 1 Jumper Settings EIM 2 Jumper Settings Lennox Indoor Lennox Outdoor System Type Diagram Heat OTHER/VENT Unit OTHER/VENT Unit Unit Heat Stages Unit Type Stages DIP Setting Type DIP Setting Conventional Conventional Air... -
Page 13: Communicating Wiring Diagrams
18 or 22AWG shielded Cut shield off at this end 18 or 22AWG Standard Thermostat Cable (4-Conductor) Lennox Communicating Lennox Communicating Thermostat Thermostat OPTION 1 OPTION 2 Figure 13. EIM Wiring Connections (Options 1 and 2) There may be situations where alternate wirings methods may need to be employed. Two options are available to address an inductive voltage issue. -
Page 14: Minimizing Electrical Noise
Outdoor Unit Thermostat R i+ I- C Unused wires Unused wires Single wire directly to Lennox C terminal or to second bundle. Communicating Thermostat Figure 15. Minimizing Electrical Noise 18/2 Brown Solid CU CL2 Thermostat Wire OPTION 3 Figure 14. EIM Connections using Separate Unshielded Cable... - Page 15 DIP SWITCH MUST BE SET TO ON POSITION. See Lennox Communicating System Wiring Connections diagram VENT VENT VENT Y2 OUT Y2 OUT IS FOR TWO-STAGE OUTDOOR UNITS ONLY Figure 18. Dual-Fuel - Lennox Communicating Furnace with Conventional Heat Pump (1 or 2-Stage)
- Page 16 Figure 19. Dual-Fuel - Conventional Furnace with Lennox Communicating Heat Pump (1 or 2-Stage) Figure 21. Hot Water or Baseboard Heat - Conventional or Communicating Air Handler in Non-Communicating Setup with either a Lennox Communicating AC Conditioner or HP LENNOX...
- Page 17 LENNOX COMMUNICATING THERMOSTAT VENTILATION HEAT PUMP FURNACE AIR HANDLER SET UNIT TYPE TO EITHER IFC OR AHC See Lennox Communicating System Wiring Connections diagram DIP SWITCH MUST BE SET TO ON POSITION. REMOVE JUMPER BETWEEN R AND W2 IF PRESENT.
- Page 18 UNIT TYPE JUMPER POSITIONS VENT LENNOX VENTILATION HEAT PUMP FURNACE AIR HANDLER COMMUNICATING FURNACE DIP SWITCH MUST BE SET TO ON POSITION. VENT VENT VENT Y2 OUT Figure 23. Dual-Fuel - Lennox Communicating Furnace, Smart Zoning and Conventional Heat Pump...
- Page 19 VENT LENNOX VENTILATION HEAT PUMP FURNACE AIR HANDLER COMMUNICATING SET UNIT TYPE TO EITHER IFC OR AHC THERMOSTAT See Lennox Communicating System Wiring Connections diagram VENT VENT VENT CBA27UHE, CBA25UHV AND CBA25UH Y2 OUT REMOVE JUMPER BETWEEN R AND W2 IF PRESENT.
- Page 20 WIRE JUMPER REQUIRED BETWEEN ON AND RED TERMINALS. 120VAC UNIT TYPE JUMPER POSITIONS VENT CONTINUOUS POWERED VENTILATION HEAT PUMP FURNACE AIR HANDLER 24VAC TRANSFORMER (FIELD-PROVIDED) DIP SWITCH MUST BE SET TO OFF. Figure 25. Lennox S40 Smart Thermostat, EIM and Ventilation (ERV/HRV or Fresh Air Damper) -...
- Page 21 TWO-WIRE CONTROL HRV/ERV TERMINAL BLOCK 6” ROUND POWER OPEN / SPRING CLOSED AND REQUIRES 24VAC HIGH-STAGE 120VAC CONTINUOUS POWERED 24VAC TRANSFORMER (FIELD-PROVIDED) Figure 26. Lennox S40 Smart Thermostat, EIM, Non-communicating Furnace, Communicating Heat Pump and Ventilation (ERV/HRV or Fresh Air Damper)
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Page 22: Alert Codes And Troubleshooting
Service Soon alerts will escalate to Service Urgent. • Service Soon alerts are found only in under the installer alert button. • Information Only-Dealer is information only and helps Lennox interpret test results and understand complicated behaviors. Information Only are not reported to homeowner or dealer. -
Page 23: Alert Codes
• Go to menu > settings > advanced settings > view dealer control center > equipment and press reset all equipment. This will allow the system to auto-detect any Lennox communicating devices attached. Thermostat did not find an indoor unit. Make sure there is an Lennox communicating indoor unit on the system. • Check for voltage and missing component. - Page 24 Review both active and cleared alerts. • iComfort Wi-Fi – Press and hold the Lennox logo on the bottom right of stat for 5 seconds to access the dealer control center. Follow the prompts to access the dealer / installer screen and select the “Alerts” tab. Review alert code details to determine which device or unit has the communication problem.
- Page 25 • Float Switch: When using a float switch, use an isolation relay between the dedicated float switch terminals as shown in “Figure 13. Lennox Communicating System Wiring Connections” on page 13 . For testing purposes, remove float switch from circuit.
- Page 26 Table 1. EIM Alert Codes and Troubleshooting GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat Actual Displayed Alert Text Alert Priority How to clear Under dealer Component or System Operational State and Troubleshooting Tip Code...
- Page 27 Table 1. EIM Alert Codes and Troubleshooting GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat Actual Displayed Alert Text Alert Priority How to clear Under dealer Component or System Operational State and Troubleshooting Tip Code...
- Page 28 • If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the ‘About’ screen. There is a discharge air temperature sensor issue. • Confirm there is no short or open circuits in the Lennox communicating thermostat connections to any of the other components in the communication system.
- Page 29 If error is applicable to the XC20, XC25, XP20 or XP25, the outdoor control will need to be replaced. • Lennox communicating thermostat sends a Y1 compressor demand to the indoor control requesting it to relay the demand to the outdoor unit.
- Page 30 Table 1. EIM Alert Codes and Troubleshooting GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat Actual Displayed Alert Text Alert Priority How to clear Under dealer Component or System Operational State and Troubleshooting Tip Code...
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Page 31: Applications (Ventilation And Zoning)
NOTE: A 40VA transformer can be ordered from Lennox using catalog The Lennox S40 thermostat ventilation function is only a turn on - turn off number 10P17. feature. All CFMs must be adjusted from the HRV/ERV unit. The ventila-... -
Page 32: Ventilation Control Modes
• The system keeps track of the amount of ventilation delivered in the Table 10. Ventilation Control Modes same manner as any single speed HRV or ERV. Fresh • When the time required to satisfy the ventilation time requirement using Ventilation Control Mode Speed Speed... -
Page 33: Thermostat Ventilation Parameters
Thermostat Ventilation Parameters Table 11. S40 Thermostat Ventilation Parameters Parameter (In alphabetical Description order) Ventilation Rates Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up is completed and the CFMs are known. Once the thermostat’s CFMs are adjusted they are used with the thermostat’s timer algorithm to determine how long to run the HRV/ERV and to change from low to high speed if a 2-stage HRV/ERVs. -
Page 34: Ventilation Rate For Low Speed
Table 11. S40 Thermostat Ventilation Parameters Parameter (In alphabetical Description order) Ventilation Control Mode - ASHRAE • In this mode the thermostat can assist the installer by validating the ventilation CFMs are capable of meeting the ASHRAE required ventilation volumes, but the thermostat has no ability to control CFM from the HRV/ERV. -
Page 35: Ventilation Outdoor Condition Override - Enabled
Table 11. S40 Thermostat Ventilation Parameters Parameter (In alphabetical Description order) Ventilation Outdoor Condition Override - Enabled Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in increments of 5ºF. Ventilation While the outdoor temperature is equal to or higher than the setting for Ventilation High Outdoor Temperature Limit, ventilation does not run. When locked High Outdoor out due to high outdoor temperature, it will become unlocked when either the outdoor temperature is missing, or when the temperature reported is 1°F less Temperature Limit...