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Nortron 21B15M - User Manual

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B SERIES ELECTRIC FURNACE
FB0002
Broan-NuTone Canada Inc.; Mississauga, Ontario www.broan.ca 877-896-1119
INSTALLATION AND USER MANUAL
IMPORTANT
: READ AND SAVE THESE INSTRUCTIONS.
30042478B
M
ODELS: 21B10M, 21B15M, 21B18M, 21B20M, 21B25M, 21B27M, 83B13, 83B24 AND 83B27
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Questions and Answers

  • O
    ovasquezSep 8, 2025
    What to do if elements are on, but motor does not run in Nortron Furnace?
    • L
      Lisa BakerSep 8, 2025
      If the elements in your Nortron Furnace are on but the motor isn't running, check the motor or capacitor, the RECIRCULATION MODE switch for open contact, and the bottom sequencer.
  • C
    Christian LongSep 10, 2025
    Why Nortron Furnace motor going on and off in short cycles?
    • G
      ghernandezSep 12, 2025
      If the motor in your Nortron Furnace is cycling on and off too frequently or infrequently, the heat anticipator in the thermostat may be incorrectly set or defective.
  • S
    Stephanie McdanielSep 12, 2025
    What causes the motor to go off, but one or more elements stay on in Nortron Furnace?
    • E
      emily60Sep 12, 2025
      If the motor shuts off but one or more elements remain on in your Nortron Furnace, a faulty sequencer could be the cause.
  • R
    rodneygarciaSep 14, 2025
    What to do if two-stage or outdoor thermostat not operating properly in Nortron Furnace?
    • M
      Mary ChandlerSep 14, 2025
      If your two-stage or outdoor thermostat isn't operating correctly with your Nortron Furnace, ensure the SEASON SELECT switch is not set to the MILD position.
  • H
    hatfieldnicoleSep 16, 2025
    Why thermostat must be set much higher than desired temperature in Nortron Furnace?
    • M
      Michael SuttonSep 16, 2025
      If the thermostat needs to be set much higher or lower than the desired temperature in your home when using your Nortron Furnace, the thermostat might not be leveled or could be out of calibration.
  • R
    Rachel AllenSep 18, 2025
    Why automatic speed change doesn’t occur when Nortron Furnace heats up?
    • M
      mevansSep 18, 2025
      If the automatic speed change doesn't occur when your Nortron Furnace heats up, check the top sequencer and the 240 V relay.

Summary

Dimensions

General Requirements and Specifications

Operating Options

Breakers

Installation Notes

Cold Air Return

Details how to attach the cold air return duct to the furnace, including side and bottom mounting options.

Electrical Wiring - Power Supply

Covers power supply requirements for single and three-phase units, including ground conductor attachment.

Connecting and Adjusting the Low Voltage Thermostat

Guide for connecting thermostat wires and setting the heat anticipator for optimal performance.

Use in Mobile Homes

Using Optional Equipment

Two-Stage or Outdoor Thermostat

Using two-stage or outdoor thermostats for furnace control, with specific model considerations.

Air Conditioning

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

Electronic Air Cleaners and;or Powered Furnace Humidifiers

Information on using 120V accessories like air cleaners and humidifiers with the furnace.

Interlock Connection

Connecting the electric furnace with other devices like wood furnaces or HRV units.

Wiring Diagrams

Service Parts

Maintenance

Troubleshooting

Warranty

Nortron 21B15M Specifications

General IconGeneral
BrandNortron
Model21B15M
CategoryFurnace
LanguageEnglish

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