Emerson 90-118E Fan Control Center Transformer with Relay

Product Description

The Emerson Climate Technologies 90-118E is a fan control center that combines a step-down transformer and an integrated relay in a single unit for residential and light commercial HVAC applications. The transformer steps line voltage down to the low-voltage signal level required by the fan motor circuit and connected control components. The built-in relay switches fan operation on and off in response to thermostat or system control signals. HVAC technicians install this unit as the central control point for fan operation within a forced-air system.

The 90-118E is suited for forced-air heating and cooling systems where a single assembly is needed to handle both voltage conversion and fan relay switching. It simplifies wiring by consolidating transformer and relay functions into one compact component, reducing the number of separate parts required in the control circuit. This makes it a practical choice for new installations and service replacements in residential HVAC equipment.

Key Features

• Integrated step-down transformer converts line voltage to low-voltage for fan motor and control circuit use
• Built-in relay switches fan on and off based on thermostat or system control signals
• Combines transformer and relay into a single control center, simplifying wiring and installation
• Designed for use in forced-air residential and light commercial HVAC systems
• Supports reliable fan cycling for consistent temperature regulation

Compatibility

Designed as an OEM-style replacement fan control center transformer with relay for residential and light commercial forced-air HVAC systems.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the HVAC unit before removing the existing control center or handling any wiring. Verify that system voltage and control circuit requirements match the unit specifications before wiring. Follow all applicable local codes and manufacturer wiring diagrams when connecting the transformer and relay leads.