BLUE

BLUE

SUPPLY AIR

FLAME ROLL-OUT

LIMIT SWITCH

SWITCH

(ALL MODELS)

(ALL MODELS)

BLUE

BLUE

ORANGE

ORANGE

WHITE (NEUTRAL)

BLACK 120V

GROUND

ROOM THERMOSTAT

VENT

SAFETY

SWITCH

(ALL MODELS)

WHITE

GREEN

PRESSURE

SWITCH

BLACK

ON/OFF SWITCH

R

Y

G

W

AIR CONDITIONER

CONDENSING UNIT

C

Y

FLAME SENSOR

RED

BLOWER DECK SWITCH

TRANSFORMER

 

WHITE W/ BLK STRIPES

WHITE

24 V

120 V

BLK W/ WHITE STRIPES

BLACK

180 120 90 60

BLACK

3 OR 4 SPEED MOTOR

GAS

VALVE

Legend

Field Wiring

Factory Wiring:

Low Voltage

High Voltage

YELLOW

BROWN

IGNITOR

BLACK

BLACK

R

C

BLACK

INDUCER

BLACK

 

 

C

 

 

 

 

 

 

 

H

 

 

 

 

 

MH

 

 

 

L

ML

 

 

 

 

 

 

 

 

WHITE

RED

ORANGE

BLUE

BLACK

RED

1

 

 

 

 

 

 

 

 

 

ORANGE

2

 

 

 

 

 

 

 

 

 

BLUE

3

 

 

 

 

 

 

 

 

 

BLACK

4

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

WHITE

6

 

 

 

 

 

 

 

 

 

 

STATUS

FAULT CONDITION

RED

LIGHT

 

Power On

ON

Limit Circuit Open or External Load On "W"

1 FLASH

(Does not apply to Deck Switch, see below)

 

Pressure Switch Open with Inducer On

2 FLASHES

Pressure Switch Closed with Inducer On

3 FLASHES

Ignition Failure (Check Ground)

4 FLASHES

115 VAC & Neutral Reversed or no Ground

5 FLASHES

False Flame or Gas Valve Relay Shorted

Continuous

Power Off or Deck Limit Open

OFF

 

FLAME

 

FAULT CONDITION

YELLOW

LIGHT

Low Flame Sensor Signal

Continuous

 

Flash

Flame Present

ON

 

 

 

MOTOR

 

If any of the original

PLUG

 

 

 

 

with

Factory Wired

the furnace must be

Heating Speeds

replaced, it must be

 

 

replaced

wiring

Furnace

Wire

material having a

Input, Btuh

Color

 

rating of

 

 

 

60,000

Red

at least

˚ C.

 

Use copper

80,000

Blue

 

 

conductors

 

 

only.

 

 

 

 

WD #710240B

Figure 30. Downflow Furnace Wiring Diagram

33

Page 33
Image 33
Nordyne M3RL installation instructions Downflow Furnace Wiring Diagram

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.