Nordyne O4LD-140A-16F User Manual

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1

Installation, Operation and

Maintenance Manual

O4LD Oil-Fired Lowboy

Warm Air Furnaces

ALL INSTALLATIONS MUST MEET

ALL LOCAL, PROVINCIAL/STATE,

AND FEDERAL CODES WHICH MAY

DIFFER FROM THIS MANUAL

Read this complete manual before

beginning installation. These instructions

must be kept with the furnace for future

reference.

FOR YOUR SAFETY:

Do not store or use gasoline or other flammable liquids or

vapors in the vicinity of this, or any other appliance.

Questions and Answers:

L
lsmallAug 21, 2025
Why is my Nordyne O4LD-140A-16F Furnace using excessive fuel oil?
- H
  Heather BaileyAug 22, 2025
  Excessive fuel consumption in your Nordyne Furnace can stem from several issues. If the system temperature rise is too high (should not exceed 85°F), check for clogged air filters and dirt build-up on the blower fan; speeding up the blower fan may help. Examine the fan control settings, ensuring the 'fan off' setting is between 90° - 100°F, with the 'fan on' setting 10° - 30°F higher. Inspect the fuel oil line for leaks and repair or replace if necessary. Check the stack temperature, which should typically range from 350° to 575°F, and ensure the draft is set to 0.02 in. w.c.
K
katrinaschultzAug 28, 2025
Why is the oil burner sputtering at the nozzle in my Nordyne O4LD-140A-16F Furnace?
- P
  pattersonnathanielAug 28, 2025
  If the oil burner in your Nordyne Furnace is sputtering at the nozzle, check the electrode settings and inspect the electrodes for dirt build-up or cracks. Ensure good contacts between the transformer and electrodes; if they're OK, replace the transformer. Replace the fuel oil filter and/or the in-line filter. Check the burner motor/fuel oil pump coupling and oil pump pressure; replace the fuel oil pump if necessary. Finally, bleed air from the oil line and replace the oil line if the problem continues.
W
William CookAug 30, 2025
Why is the supply air temperature too hot from my Nordyne Furnace?
- K
  Karen PattersonAug 31, 2025
  If the supply air temperature from your Nordyne Furnace is too hot, begin by checking and cleaning or replacing the air filter if it's blocked or dirty. Also, check all dampers and open any that are closed, including registers in unused rooms. Then, check the system temperature rise; if it's too high, increase the speed of the blower fan.
M
matthewtranSep 3, 2025
Why is the supply air temperature too cool from my Nordyne O4LD-140A-16F Furnace?
- A
  Austin RussoSep 3, 2025
  If the supply air from your Nordyne Furnace is too cool, check the system temperature rise and slow down the blower fan if there's excess airflow. Inspect the supply air ductwork, sealing any leaky joints and seams and insulating the ductwork if necessary to address excessive duct losses.
M
maryunderwoodSep 5, 2025
What causes soot to build up on the blast tube of my Nordyne Furnace?
- P
  Peter CraneSep 5, 2025
  If soot is building up on the blast tube of your Nordyne Furnace, start by checking the alignment between the oil burner blast tube and the fire pot, ensuring the blast tube is centered with the fire pot burner opening and the oil burner head is ¼ inch back from the inside surface of the fire pot. Check the nozzle size and angle, referring to Appendix A, and verify the distance from the head to the inside surface of the fire pot. Inspect the fire-pot and repair or replace if defective.
G
Gabriela JenkinsSep 9, 2025
Why is the supply air temperature too cool at the start of Nordyne Furnace cycle?
- M
  Melissa AndersonSep 9, 2025
  If the supply air temperature is too cool during the initial moments of your Nordyne Furnace cycle, increase the differential between the fan control 'fan off' and 'fan on' settings. Register air deflectors may also help. Also check the supply air ductwork. Seal leaky joints and seams. Insulate ductwork if necessary.
T
Tina JensenSep 12, 2025
Why my home does not heat evenly with Nordyne O4LD-140A-16F Furnace?
- W
  Wesley KhanSep 12, 2025
  This is not likely to be a furnace problem. Balance duct system.

Nordyne O4LD-140A-16F Specifications

General

Brand	Nordyne
Model	O4LD-140A-16F
Category	Furnace
Language	English

Summary

Unit Location and Clearances

Combustion Air Requirements

Chimney Venting Guidelines

Barometric Damper Control

Fan and Limit Control Operation

Electrical Connection Standards

Piping Installation Procedures

Oil Burner Adjustment for Efficiency

Burner Electrode Positioning

Primary Combustion Control

Combustion Chamber Inspection

Circulating Air Blower System

Maintenance and Service Guide

Routine Maintenance by Home Owner

Homeowner tasks for furnace upkeep, including filter checks and general inspection.

Annual Service by Contractor

Tasks for professional servicing, including heat exchanger cleaning and electrical checks.

Operating Instructions for Furnace

Procedure to Light the Unit

Oil Burner Air Adjustment Details

Burner Electrode Settings

Furnace Start-Up Procedure

Appendix B: Wiring Diagram

Appendix C: Troubleshooting Guide

Furnace Fails to Start

Recurring Shutdowns and Manual Reset

Oil Burner Sputtering at Nozzle

Excessive Fuel Oil Consumption

Excessive Smoke Production

Soot Buildup on Blast Tube

Insufficient Home Heating

High Supply Air Temperature

Low Supply Air Temperature

Final System Check-Out

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