FC90113 120V SPDT RELAY Control Center

The FC90113 Control Center is an OEM HVAC control assembly featuring a 120V SPDT relay designed to manage blower motor and control circuit functions in residential and light commercial heating and cooling equipment. Built for dependable switching performance and easy replacement of worn or failed control components.

Cross-Reference

• FC90113
• FC90-113
• FC 90113

Direct OEM

FC90113

Compatible Brands

• ICP
• Heil
• Tempstar
• Arcoaire
• Comfortmaker
• KeepRite
• Day & Night
• Universal HVAC applications (verify specifications)

Application

Used in furnaces, air handlers, and HVAC control systems to:

• Control blower motor operation
• Switch line voltage circuits
• Interface thermostat and control board outputs
• Provide SPDT relay switching for fan functions

Related Components

• Fan Relay
• Transformer
• Integrated Control Board
• Contactor
• Blower Motor Capacitor
• Limit Switch
• Fan Control Board
• Thermostat

Technician Notes

The FC90113 control center contains a 120V SPDT relay commonly used for indoor blower control and auxiliary switching functions. When diagnosing failures, verify proper coil voltage, relay contact continuity, and terminal integrity. Excessive current draw from the blower motor can shorten relay life.

Common Symptoms of Failure

• Indoor blower not operating
• Blower runs continuously
• Intermittent fan operation
• Relay chatter or buzzing
• Burned or pitted contacts
• No voltage output through relay contacts
• Delayed fan engagement
• HVAC system does not respond to thermostat commands

Installation Tips

1. Disconnect electrical power before servicing.
2. Verify relay coil voltage matches system requirements.
3. Label all wiring before removal.
4. Inspect terminals for heat damage.
5. Transfer wires individually to avoid miswiring.
6. Confirm proper relay operation after installation.
7. Test heating, cooling, and fan-only modes before returning equipment to service.

Recommended Inspection Items

• Relay coil voltage
• Relay contact condition
• Blower motor amperage
• Control board outputs
• Thermostat operation
• Wiring harness connections
• Terminal discoloration or overheating
• Incoming line voltage
• Airflow restrictions