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Nortron 21B18M - 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

  • T
    Timothy FowlerSep 8, 2025
    What to do if elements are on, but motor does not run in Nortron Furnace?
    • J
      jcarterSep 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.
  • N
    Nicholas DixonSep 10, 2025
    Why Nortron Furnace motor going on and off in short cycles?
    • J
      Jason GonzalezSep 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.
  • J
    Joy MasseySep 12, 2025
    What causes the motor to go off, but one or more elements stay on in Nortron Furnace?
    • V
      Victoria MillerSep 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.
  • C
    Cynthia RobinsonSep 14, 2025
    What to do if two-stage or outdoor thermostat not operating properly in Nortron Furnace?
    • K
      Kristen MaloneSep 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.
  • S
    Stephanie ClementsSep 15, 2025
    Why thermostat must be set much higher than desired temperature in Nortron Furnace?
    • K
      Katherine AndersonSep 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
    schultzstaceySep 18, 2025
    Why automatic speed change doesn’t occur when Nortron Furnace heats up?
    • J
      Jacob NicholsonSep 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

INSTALLATION NOTES

ELECTRICAL WIRING - POWER SUPPLY

Requirements for single-phase and three-phase supply wire connections.

CONNECTING AND ADJUSTING THE LOW VOLTAGE THERMOSTAT

Guide for connecting thermostat wires and setting the heat anticipator.

WIRING DIAGRAMS

TROUBLESHOOTING

Nortron 21B18M Specifications

General IconGeneral
BrandNortron
Model21B18M
CategoryFurnace
LanguageEnglish

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