To Remove the Burner Assembly:

1.Follow the instructions “To Turn Off the Fuel Supply to the Appliance.”

2.Disconnect the flame sensor wire from the burner box.

3.Disconnect the ignitor wires at the 2 pin plug. This is a locking quick connect and both sides of the lower section must be depressed in order to be separated.

4.Remove the wires from the terminals of the gas valve.

5.Disconnect the rubber pressure tubes from the gas valve and the burner box.

6.Remove the burner access cover plate from the burner box.

7.Remove supply gas piping from the gas valve.

8.Carefully remove the burner assembly fas- teners and remove the burner assembly from the appliance. Keep the fasteners that were removed. Note that the burner box may have hooks near the top and on the right and left hand sides. To remove this type of burner box, lift the burner box upwards and then remove the box from the unit.

To Remove the Burner Orifices:

1.Remove the four (4) fasteners that secure the gas manifold to the burner box, as shown in Figure 25. Carefully remove the gas manifold assembly from the burner box. Note that the gas manifold assembly consists of the gas valve, the gas manifold, and the orifices.

2.Carefully remove the burner orifices from the gas manifold, as shown in Figure 25.

!CAUTION:

Caution: Do not re-drill the burner orifices. If the orifice size must be changed, use only new orifices.

Note: The size of the new orifices that will be installed into the unit will depend upon the type of conversion (sea level or high altitude; natural gas or LP gas).

To Convert the Unit to the Alternate Gas

1.Remove the orifice bag from the manifold of the unit.

2.Install the appropriate gas burner orifices into the gas manifold. Remember if in- stalling at altitudes above 4,000 feet to install the proper orifices, shown in Table 8. When installing the new orifices, DO NOT use pipe joint compound on the orifice threads. Screw the orifices into the manifold by hand until snug to eliminate cross threading, then tighten with a wrench. Before installing an orifice, check the face or side of the orifice for the drill number to ensure that it is the appropriate size.

3.For the conversion to the alternate fuel, the gas valve regulator cap must be turned over, as shown in Figure 23. You will unscrew the cap and reinstall for your in- stallation. After reinstalling the cap, you will be able to read "NAT" for the conversion to natural gas or "LP for the conversion to LP gas.

Furnace

Furnace Rating

No. of

Elevation

Elevation

Elevation

Elevation

Elevation

Plate Input

Model Number

0 - 2000

2000-4000

4000-6000

6000-8000

8000-10000

Burners

(Btuh)

M3RL -

 

Nat

LP

Nat

LP

Nat

LP

Nat

LP

Nat

LP

 

 

 

 

 

060A-A/BW

60,000

4

50

57

50

57

51

58

51

58

52

59

 

 

 

 

 

 

 

 

 

 

 

 

 

080A-A/BW

80,000

5

49

1.15 mm

49

1.15 mm

50

57

50

57

51

58

Table 8. Approximate Orifice Size for Natural and LP Gases

22

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Nordyne M3RL To Remove the Burner Assembly, To Remove the Burner Orifices, To Convert the Unit to the Alternate Gas
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M3RL specifications

The Nordyne M3RL is a high-efficiency gas furnace designed for residential heating applications, characterized by its robust performance and advanced technologies. It is part of Nordyne's distinguished lineup, which emphasizes reliability and comfort in home heating systems. The M3RL model is particularly notable for its focus on energy efficiency, making it an attractive option for homeowners looking to reduce their energy expenses while maintaining optimal heating levels.

One of the standout features of the Nordyne M3RL is its high Annual Fuel Utilization Efficiency (AFUE) rating, which often exceeds 80%. This efficient design ensures that more of the fuel consumed is converted into usable heat for the home. By employing a variable-speed blower, the M3RL enhances comfort by allowing for more precise control over air circulation, contributing to better temperature consistency throughout the living space.

The M3RL utilizes advanced multi-stage heating technology, allowing the system to operate at different capacities depending on the heating demand. This means it can run at lower settings during milder weather, which not only saves energy but also reduces wear and tear on the equipment, extending its lifespan. The furnace also includes a reliable ignition system that ensures quick and safe starts, eliminating the inefficiencies associated with older pilot light systems.

Another important characteristic of the Nordyne M3RL is its acoustical insulation, which minimizes operational noise. The quiet operation is particularly valued in residential settings, where noise pollution can be disruptive. Additionally, the furnace features a compact design, making it easy to install in a variety of spaces, including tight basements or utility rooms.

The M3RL model is also equipped with a smart control system that interfaces seamlessly with modern thermostats, offering homeowners the ability to program their heating schedules and optimize energy usage. This integration with smart home technology positions the M3RL not just as a heating solution, but as a component of a more comprehensive home energy management system.

In conclusion, the Nordyne M3RL gas furnace represents a blend of efficiency, advanced technology, and user-friendly features. Its high AFUE rating, multi-stage heating capability, quiet operation, and smart technology integration make it a reliable choice for homeowners aiming to enhance their comfort while minimizing energy costs. This furnace is a testament to Nordyne's commitment to innovation in the HVAC industry.
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