The Equipment Interface Module (EIM) allows a Lennox® Communicating Thermostat to be used with most noncommunicating HVAC systems.

The EIM allows most conventional, non-communicating furnaces or air handlers (up to 3 stages heating and 2 stages cooling) to emulate a Lennox® Communicating indoor unit (with reduced communication features). If you are unsure you can apply this interface with your equipment, please contact us BEFORE you order.

• Contains all necessary relays and controls to emulate a Lennox® Communicating indoor unit
• Module has two green LEDs
• One indicates status and aids in troubleshooting, a second LED indicates active RSBus communication
• Any system alerts/warnings are transmitted to the Lennox® Communicating Thermostat
• Serial communications bus (RSBus), with less wiring than a conventional heating/cooling system, allows system communication
• Uses 4-wire, 18-gauge standard thermostat wiring for connection to the Lennox® Communicating Thermostat
• Conventional thermostat wiring connects the EIM to the non-communicating indoor/outdoor unit equipment

Specification:

• Brand: Lennox
• Catalog Number: 22X18 
• New Model/Part Number: 103861-04 
• Type: Equipment Interface Module 
• Additional Information: 6-1/8" H x 7-1/2" W x 1-3/8" D
• Old Model/Part Number: 10T50 (CAT # X0444)