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NBK-21078 – Terminal Board & TD Relay – (Special Order) - Total Hearth
NBK-21078 – Terminal Board & TD Relay – (Special Order) - Total Hearth
Modine

Terminal Board & TD Relay | NBK-21078

Special order item - may require extra time to fulfill and ship. Special order parts are non-returnable.

In stock
SKU: SO-21078
$149.99
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NBK-21078 – Terminal Board & TD Relay 

The NBK-21078 Terminal Board & TD (Time Delay) Relay is designed for use in greenhouse heaters and HVAC systems requiring coordinated blower control. This precision assembly integrates essential terminal wiring with a built-in time delay relay, ensuring reliable sequencing between heating and blower functions. It prevents premature blower activation, improving comfort and extending equipment life.

Key Features:
• Integrated Design: Combines terminal wiring and time delay relay into a single compact control board
• Protects Heat Exchanger: Delays blower activation until proper temperature is reached, preventing cold air discharge
• Reliable Cycle Control: Prevents short cycling, reducing system stress and extending component longevity
• Direct Replacement: Matches OEM specifications for easy installation and consistent operation

Specifications:
• SKU: 21078
• Category: Greenhouse / Terminal Boards & Relays
• Description: NBK-21078 Terminal Board & TD Relay
• Equivalent To:
   – Modine 4015315
   – Modine 3H36849-1
   – Modine 5H78126-1

Why Replace This Component:
A failing terminal board or time delay relay can lead to blower malfunctions, frequent cycling, or system shutdowns. Replacing it with the NBK-21078 ensures proper timing and electrical coordination, protecting both your heating system and your greenhouse environment.