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Nortron D SERIES - User Manual

Nortron D SERIES
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D SERIES ELECTRIC FURNACE
FB0004
INSTALLATION AND USER MANUAL
IMPORTANT
: READ AND SAVE THESE INSTRUCTIONS.
MODELS: 21D10, 21D15, 21D18, 21D20, 21D23, 21D25 AND 21D27
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Questions and Answers

  • S
    Scott TaylorSep 2, 2025
    Why does my Nortron D SERIES Furnace motor keep going on and off?
    • S
      ssmithSep 2, 2025
      If the motor in your Nortron Furnace is cycling on and off too frequently or infrequently, the heat anticipator in your thermostat may be incorrectly set or defective. Check the heat anticipator setting in the thermostat.
  • S
    Shelby RamirezAug 31, 2025
    Why does the motor in my Nortron D SERIES Furnace run continuously?
    • R
      Ricardo DaviesAug 31, 2025
      If the motor in your Nortron Furnace runs continuously, first check the Continuous Speed switch to ensure it is in the “Off” position. Also, verify that the thermostat wires are correctly attached to the furnace.
  • J
    Jennifer Diaz MDAug 29, 2025
    Why is my Nortron D SERIES not producing enough heat?
    • T
      Tyler TranAug 29, 2025
      If your Nortron Furnace isn't producing enough heat, several factors could be at play. Start by checking for any defective elements or relays. Ensure the Season Select switch isn't set to the “Mild” position. Inspect your ducts for obstructions and replace any dirty filters that might be restricting airflow. Also, verify that a two-stage or outdoor thermostat is correctly wired and functioning properly. Finally, confirm that your house has an adequate number of cold air returns.
  • G
    Greg KimAug 27, 2025
    Why thermostat must be set higher than desired temperature in Nortron D SERIES Furnace?
    • C
      Connie MorrisAug 27, 2025
      If the thermostat on your Nortron Furnace needs to be set much higher or lower than your desired house temperature, the thermostat may not be leveled or may be out of calibration.
  • K
    Kelly HendersonAug 26, 2025
    Why does Nortron D SERIES motor go on and off in short cycles?
    • D
      Dr. Linda Hicks MDAug 26, 2025
      If the motor in your Nortron Furnace cycles on and off too quickly or slowly, the heat anticipator in the thermostat may be incorrectly set or defective.
  • N
    ncooperAug 25, 2025
    Why does the motor run continuously on Nortron Furnace?
    • T
      Tony MillerAug 25, 2025
      If the motor in your Nortron Furnace runs continuously, check if the thermostat wires are incorrectly attached to the furnace.
  • A
    Amber MillerAug 22, 2025
    Why does the breaker on the front panel of Nortron D SERIES Furnace trip?
    • C
      Cassandra SnyderAug 22, 2025
      If the breaker on the front panel of your Nortron Furnace trips, it indicates an overcurrent on the heating element. Reset the breaker. If the problem persists, call an electrician.

Summary

General Requirements and Specifications

Operating Options

Breakers

Installation Notes

Cold Air Return

Details on attaching the cold air return duct to the furnace sides, rear, or bottom.

Electrical Wiring - Power Supply

Instructions for connecting the power supply, emphasizing proper grounding and wire gauge.

Connecting and Adjusting the Low Voltage Thermostat

Guide for wiring thermostat and setting the heat anticipator for optimal furnace operation.

Use in Mobile Homes

Using Optional Equipment

Two-Stage or Outdoor Thermostat

Guidance on connecting and using two-stage or outdoor thermostats with the furnace.

Air Conditioning

Information on integrating air conditioning with the furnace, including coil placement and airflow.

Electronic Air Cleaners and;or Powered Furnace Humidifiers

Details on using an adapter kit to power 120V air cleaners and humidifiers.

Interlock Connection

Procedure for connecting the electric furnace with other devices like wood furnaces.

Wiring Diagrams

21 D10 Model Wiring

Detailed wiring diagram for the Nortron D Series 21D10 electric furnace.

21 D15 Model Wiring

Detailed wiring diagram for the Nortron D Series 21D15 electric furnace.

21 D18 & 21 D20 Models Wiring

Detailed wiring diagrams for Nortron D Series 21D18 and 21D20 electric furnaces.

21 D23 & 21 D25 Models Wiring

Detailed wiring diagrams for Nortron D Series 21D23 and 21D25 electric furnaces.

21 D27 Model Wiring

Detailed wiring diagram for the Nortron D Series 21D27 electric furnace.

Service Parts

Maintenance

Troubleshooting

Nortron D SERIES Specifications

General IconGeneral
BrandNortron
ModelD SERIES
CategoryFurnace
LanguageEnglish

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