Suburban 520839 Fan Control Wiring Harness – NT Series Furnaces (For Use with 521099 Board)

Product Overview

The Suburban 520839 Wiring Harness is designed specifically for Suburban NT series RV furnaces, providing the necessary connection to enable fan control functionality when upgrading to the 521099 ignition control board.

This harness allows your furnace to properly utilize the added fan control feature built into the 521099 board, ensuring smooth operation, improved efficiency, and reliable performance.

If your NT series furnace did not originally include fan control, this harness is required to complete the upgrade.

Key Features

• Designed for Suburban NT series furnaces
• Enables fan control functionality when used with the 521099 control board
• Required for upgrading systems without fan control
• Provides secure and reliable wiring connections
• Helps ensure proper furnace operation and efficiency
• Reduces risk of electrical issues and improper wiring
• Direct-fit design for straightforward installation

Specifications

• Part Number: 520839
• Product Type: Fan control wiring harness
• Application: Suburban NT series RV furnaces
• Function: Enables fan control integration with 521099 board

Compatible Furnace Models

• NT-24SP
• NT-30SP
• NT-34SP
• NT-40

Important Installation Note

This wiring harness connects directly to the Suburban 521099 ignition control board to activate the fan control feature.

• The module board (521099) is NOT included
• This harness is required when upgrading NT series furnaces that do not already have fan control wiring

When Do You Need This Harness?

You will need the 520839 wiring harness if:

• You are upgrading to the 521099 control board
• Your NT series furnace does not have fan control wiring
• You are replacing damaged or missing wiring
• Your furnace fan control is not functioning after a board upgrade

Why This Harness Matters

• Ensures proper communication between furnace components
• Allows full functionality of upgraded control boards
• Prevents wiring mismatches and installation issues
• Helps extend furnace life and reliability

FAQ

Do I need this with the 521099 control board?
Yes, if your NT series furnace does not already have fan control wiring, this harness is required.

Is the control board included?
No, the 521099 module board is sold separately.

Will this fit SF series furnaces?
No, this harness is specifically designed for NT series furnaces only.

Is installation difficult?
No, it is a direct-fit harness designed for straightforward installation.

What happens if I don’t use this harness with the upgrade?
The fan control feature will not function properly, and furnace performance may be affected.