White-Rodgers 90-118E Transformer

The White-Rodgers 90-118E Transformer is a heavy-duty fan control center engineered for seamless integration into 120V primary HVAC systems requiring 24V secondary control voltage. This transformer and relay combination features an energy-limiting Class II transformer and a versatile SPNO/SPNC relay (Single Pole Normally Open/Normally Closed), making it an ideal choice for managing line-voltage fans and pumps in residential or light commercial heating and cooling applications. Designed for rapid deployment, the unit mounts directly onto a standard 4" x 4" junction box and includes pre-wired line voltage connections and color-coded, pre-stripped leads to reduce field installation time. The low voltage terminal board provides five combination screw/solder terminals, ensuring secure connections for both one and two-speed motors. With a 40 VA rating and the ability to handle up to 13.8A full load at 120V, the 90-118E provides the reliable switching performance that contractors expect from White-Rodgers components.

Key Benefits

• Universal Compatibility: Supports both single and two-speed fan motors, offering flexibility for various air handler configurations.
• Efficient Installation: Features pre-stripped color-coded leads and a plug-in style relay for fast field replacement and simplified wiring.
• Industrial Durability: Includes an energy-limiting Class II transformer design to protect control circuits from overcurrent issues.
• Standardized Mounting: Engineered to fit perfectly on 4" x 4" junction boxes, providing a clean and secure professional finish.
• High Electrical Rating: Capable of managing 13.8A AFL at 120 VAC and 6.9A AFL at 240 VAC, suitable for demanding motor loads.

Common Questions

Can the 90-118E be used for multiple fan speeds?
Yes, the White-Rodgers 90-118E features standard double-throw relays capable of switching both one and two-speed motors by utilizing the SPNO and SPNC contact configurations.

What are the voltage specifications for this fan center?
The internal 40 VA transformer operates on a 120V primary input and steps down to a 24V secondary output for use with standard 24V thermostats and controllers.

Is the relay replaceable on this unit?
The unit is designed with a plug-in style relay, allowing technicians to replace the relay component specifically without needing to pull the entire transformer or mounting plate.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.