Nordyne M3RL installation instructions Low Voltage Wiring, Electrical Data

Page 25

tral line is connected to the white wire and the incoming "hot" line is connected to the black wire in the furnace junction box. The furnace will not operate unless polarity and ground are properly connected. See Figure 26.

!CAUTION:

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Verify proper operation after servicing.

!ATTENTION:

Lors des opérations d'entretien des commandes, étiqueter tous les files avant des les déconnecter. Toute erreur de câblage peut être une source de danger et de panne.

S'assurer du bon fonctionnement de l'appareil après tout entretien.

Low Voltage Wiring

Install the thermostat per the manufacturer's instructions. The low voltage (24 volt) connec- tions from the thermostat are made at the terminal strip on the control board in the furnace. See Figure 28 for the proper connections for heating only (two-wire) and heating/cooling (four-wire) applications. The recommended minimum wire gauge for thermostat wiring is shown in Table 10.

 

 

 

 

 

 

3 Amp Fuse

Blower Off

60 90

120

180

 

 

 

 

COM

 

 

 

 

 

R

 

 

 

 

 

Timing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

24 V

 

 

 

 

 

TWIN

 

 

 

 

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flame Signal

 

 

 

G

 

 

 

 

 

 

Light (Yellow)

 

 

 

W

 

 

 

 

 

 

 

Status

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

6

3

 

 

 

Light (Red)

 

 

 

 

 

 

 

 

 

 

 

 

8

5

2

 

 

 

 

 

 

 

 

 

7

4

 

1

 

 

 

 

 

 

 

 

Common

 

 

 

 

 

 

 

 

 

 

 

 

Leads

EAC

 

Neutrals

 

 

 

 

 

 

 

 

 

 

 

Unused Motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connect

HUM

 

 

 

 

Leads

 

 

 

 

 

 

 

 

 

HUM

M3 M2 M1

HEAT

COOL

EAC

XFMR

L1

Neutral

 

6

3

Lead of

 

 

5

2

 

 

 

 

 

 

 

 

Electronic

 

 

4

1

 

 

 

 

 

 

 

 

Air Cleaner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and/or Humidifier

 

 

 

 

 

 

 

 

 

 

 

 

Here.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electronic Air Tap

 

Humidifier Tap

 

 

 

 

 

(.5A@ 120 VAC)

 

 

 

 

 

 

 

 

 

 

(.5A@ 120 VAC)

 

 

These motor speed taps are

 

 

 

 

 

 

 

 

 

 

 

 

 

 

not used for two-stage models

Figure 27. Blower Speed Tap Location

Furnace

Cabinet

Nominal

Maximum

Minimum

Maximum

Minimum

Maximum

Input

Width

Electrical

Operating

Operating

Furnace

Wire

Fuse or Circuit

(Btuh)

(in.)

Supply

Voltage

Voltage

Amperes

Gauge

Breaker Amps*

60,000

19.75

 

115-60-1

127

103

 

9.7

14

15

80,000

19.75

 

115-60-1

127

103

 

9.7

14

15

 

 

 

 

 

 

 

 

 

Thermostat Wire Gauge

 

Recommended Thermostat Wire Length

 

 

 

 

 

 

 

 

 

 

 

 

2-wire (heating)

4 or 5-wire (cooling)

 

 

 

 

 

 

 

 

 

 

24

 

 

55 ft.

 

25 ft.

 

 

22

 

 

90 ft.

 

45 ft.

 

 

20

 

 

140 ft.

 

70 ft.

 

 

18

 

 

225 ft.

 

110 ft.

* Time-delay fuses or HACR-type circuit breakers are required.

Table 10. Electrical Data

Field Supplied

Field Supplied

Fused Service

Panel Connector

Panel

 

 

Black (Hot)

Black

Black

White (Neutral)

White

White

Green or Bare

 

 

(Ground)

 

Ground

Ground

 

Field Supplied Disconnect

Within Sight of Furnace

 

 

 

 

 

 

 

 

 

Field Line Voltage

 

 

 

 

Black

Wiring

 

 

 

 

Factory Line

 

 

 

 

White

 

 

 

 

 

 

 

 

 

 

Voltage Wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ground

 

 

 

 

 

 

 

Junction Box (may be internal

or external to the furnace). These connections can be made in the field supplied disconnect at the furnace.

Figure 26. Line Voltage Field Wiring

25

Image 25
Contents Installation Instructions Page L 060 a a W Table of ContentsFurnace Specifications/Airflow Data Shipping WeightGeneral Top ViewGeneral Description Owner InformationManufacturer WARRANTY, OWNER’S Responsibilities Installation StandardsCirculating AIR Supply LocationMinimum Clearances Return AIR Provisions Duct ConnectorsDucted Return AIR Closet or AlcoveDuct Installation Duct Connector SelectionAIR Distribution Systems Installing Screw Down Duct CON- Nector Installing Platinum Series 14 Round Duct ConnectorCUT Duct Opening Finger Tabbed only Screw Down Platinum SeriesAlternate Attachment Methods Installing Finger Tabbed Duct CON- NectorsVenting and Combustion AIR Requirements Install FurnaceGeneral Furnace Must not be Common Vented with Other Appliances Venting RequirementsVent Termination Clearances for Direct Vent Furnaces Vent TableVent Pipe Material Vent Pipe InstallationHorizontal Venting Downflow FurnaceHorizontal Venting Drainage of Condensate from Furnace Alternate Horizontal Vent InstallationGAS Supply and Piping Furnace with Condensate Drain Trap AssemblyLeak Check ConversionHigh Altitude Derate To Turn Off Fuel Supply to the ApplianceTo Remove the Burner Orifices To Remove the Burner AssemblyTo Convert the Unit to the Alternate Gas Approximate Orifice Size for Natural and LP GasesConvertible Pressure Regulator Cap Lighting and Adjustment of the ApplianceLine Voltage Wiring Electrical WiringType of Fuel Manifold Pressure Completing the ConversionElectrical Data Low Voltage WiringStart-Up Procedure START-UP and AdjustmentsVentilation Sequence of Operation Shut Down ProcedureVerifying Firing Rate Description of Components Verifying Operation of the Supply Air Limit SwitchGas Flow Rate Verifying Burner OperationAccessory Kits MaintenanceCombustion Air and Vent System Air FilterSystem Operation Information Condensate Drain AssemblyLubrication Blower CompartmentFurnace Fails to Operate Cooling ModeM3 Downflow Furnace Downflow Furnace Wiring Diagram Page Fuel Type INSTALLATION/PERFORMANCE Check List¢7082197¤

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.