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

Page 24 Page 26
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Image 25
Nordyne M3RL Series installation instructions Low Voltage Wiring, Electrical Data
Page 24 Page 26

M3RL Series specifications

The Nordyne M3RL Series is a cutting-edge line of residential heating and cooling systems designed to enhance home comfort while emphasizing energy efficiency and reliability. Engineered with the latest technologies, the M3RL Series stands out as a premier choice for homeowners seeking optimal climate control, advanced features, and quiet operation.

One of the standout characteristics of the Nordyne M3RL Series is its high-efficiency performance. With Seasonal Energy Efficiency Ratios (SEER) that surpass industry standards, these systems deliver exceptional cooling power while using less energy. This efficiency not only translates to lower utility bills but also reduces the environmental footprint, making the M3RL Series an eco-friendly option.

Incorporating advanced inverter technology, the M3RL Series units operate at varying speeds, allowing them to adjust cooling and heating output to match the current demand. This feature ensures consistent temperature control while minimizing energy consumption. The systems are also equipped with a variable-speed compressor, which works in harmony with the inverter technology to provide seamless operation and quiet performance.

The M3RL Series showcases durability through its robust construction. The outdoor units feature a powder-coated finish to withstand the elements, while the indoor components are designed with high-quality materials to ensure longevity. The environmentally friendly refrigerant used in these systems further emphasizes Nordyne's commitment to sustainability.

Another notable aspect is the advanced control options available with the M3RL Series. Homeowners can choose from various thermostat solutions, including smart thermostats that offer remote control capabilities and programming features. This flexibility allows users to optimize their heating and cooling schedules, enhancing both comfort and efficiency.

In terms of installation, the M3RL Series is designed with versatility in mind. The compact and lightweight design of the units ensures ease of placement in various home layouts, while the comprehensive installation manuals and support from Nordyne make the process straightforward for HVAC professionals.

The Nordyne M3RL Series is truly a hallmark of modern home climate control, embodying efficiency, durability, and advanced technology. With its combination of high-performance features, user-friendly controls, and a commitment to sustainability, it provides an ideal solution for homeowners looking to enhance comfort while reducing energy costs. The M3RL Series represents a significant step forward in the evolution of residential heating and cooling systems.
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