Horizontal Venting

Vent and combustion air intake terminations must be as shown in Figure 19 unless the concentric vent termination kit is used.

!WARNING:

Ensure that the combustion air vent and the exhaust vent are configured as shown in Fig. 19. Improper vent termination can cause recirculation of the flue gases. This may result in furnace vibration. In severe cases, the furnace will cycle, due to the intermittent contact between the flame and the flame sensor. If you note these oscillations occurring, check the vent configuration. Make sure that the exhaust vent does not have a 90 degree termination.

For horizontal venting, either the Horizontal Exterior Vent Mounting Kit or the Concentric Vent Termination Kit may be used (See Table 12).

For Canadian installations please refer to the Canadian Installation Code (CAN/CGA-B149.1 or 2) and/or local codes.

The Horizontal Exterior Vent Mounting Kit con- sists of two face plates and an insulating gas- ket to seal the exterior surface. A hole sized closely to the pipe diameter must first be cut through the wall. A short length of pipe is then cut such that it can penetrate the wall and be held in place by closely fitting standard cou- plings. The face plates are retained on both sides of the wall by the couplings, and the gasket is retained against the wall by the outer face plate. Face plates must be fastened to the wall and the outside one must be flashed as appropriate to prevent entry of water.

When the above kits are not used the following steps are required:

1.Check the hole size cut through the exte- rior wall. Insure that the hole diameter is less than the diameter of the couplings to be used.

2.Extend the vent pipe through the wall approximately 1" and seal the area be- tween the wall and pipe.

3.Apply couplings to the vent pipe on the interior and exterior sides of the wall to insure the pipe can not be pushed or pulled through the wall.

4.Insure the combustion air inlet pipe has a 90 degree termination elbow, and is pointing downward as shown in Figures 19 & 20.

Note that a combustion air intake must be provided with an elbow opening downward.

When the vent pipe must exit an exterior wall close to the grade or expected snow level, a riser should be provided as shown in Figure 18. Insulation is required to prevent freezing of this section of pipe.

Vertical Venting

For vertical venting, either the configuration shown in Figure 20 or the Concentric Vent Termination Kit may be used. Vertical venting is one of the shortest routing methods when piping vents for furnaces. The M3 furnace operates trouble-free when the furnace is in- stalled with a shorter vent.

•The inlet for the combustion intake pipe must be extended at least one foot above the roofline or snow accumulation level.

•The outlet of the vent must be extended at least 10 inches above the inlet of the combustion air intake pipe.

•The vent as well as the combustion air intake

pipe should be located on the same side of the roof. Both pipes must not be closer than 5 inches apart. They should not be separated more than 36 inches.

The roof penetration must be properly flashed and waterproofed with a plumbing roof boot or equivalent flashing. Termination spacing re- quirements from the roof and from each other must be per Figure 20.

Concentric Vent Termination

A concentric vent termination is approved for use with these furnaces (See Table 12). For proper installation of the concentric vent termi- nation, follow the installation instructions pro- vided with the kit.

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.