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Nortron 21B25M - 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

  • D
    Dylan PowellSep 8, 2025
    What to do if elements are on, but motor does not run in Nortron Furnace?
    • J
      Joseph McdowellSep 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.
  • D
    Dr. Catherine Haney DVMSep 10, 2025
    Why Nortron Furnace motor going on and off in short cycles?
    • A
      aferrellSep 10, 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.
  • A
    April SchneiderSep 12, 2025
    What causes the motor to go off, but one or more elements stay on in Nortron Furnace?
    • R
      robertsonmichaelSep 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.
  • T
    Tara BrooksSep 13, 2025
    What to do if two-stage or outdoor thermostat not operating properly in Nortron Furnace?
    • J
      Jacob ValdezSep 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.
  • G
    Gordon WallaceSep 15, 2025
    Why thermostat must be set much higher than desired temperature in Nortron Furnace?
    • L
      Lisa ManningSep 15, 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.
  • S
    Sandra MatthewsSep 18, 2025
    Why automatic speed change doesn’t occur when Nortron Furnace heats up?
    • F
      fhicksSep 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 on attaching the cold air return duct to the furnace.

ELECTRICAL WIRING - POWER SUPPLY

Requirements for single-phase and three-phase unit power supply wiring.

CONNECTING AND ADJUSTING THE LOW VOLTAGE THERMOSTAT

Guide for connecting thermostat wires and setting the heat anticipator.

USE IN MOBILE HOMES

USING OPTIONAL EQUIPMENT

TWO-STAGE OR OUTDOOR THERMOSTAT

How to use two-stage or outdoor thermostats with the furnace.

AIR CONDITIONING

Information on integrating the furnace with an air conditioning system.

ELECTRONIC AIR CLEANERS AND;OR POWERED FURNACE HUMIDIFIERS

Details on using accessory kits for air cleaners and humidifiers.

INTERLOCK CONNECTION

Connecting the furnace with other devices like wood furnaces.

WIRING DIAGRAMS

SERVICE PARTS

MAINTENANCE

TROUBLESHOOTING

WARRANTY

Nortron 21B25M Specifications

General IconGeneral
BrandNortron
Model21B25M
CategoryFurnace
LanguageEnglish

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