Nortron ECM SERIES Instructions Manual - User Manual

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ECM SERIES ELECTRIC FURNACE

TEL.: 905-670-2500

FAX: 905-795-8311

CUSTOMER SERVICE TEL.: 1-888-882-7626

MISSISSAUGA, ONTARIO L5T 1H9

30042458A

• Never tamper with the unit or its controls. User MUST contact

a specialized contractor when a failure occurs. DO NOT
ATTEMPT to repair.

• When using a humidifier make sure not to damage the heating

element bank.

• We recommend that your unit be inspected by a specialized

technician once a year.

• Poor maintenance of air filters OR an unbalanced static

pressure may result in a performance decrease.

• Always use genuine parts for maintenance or service call.

The use of unbranded parts will void the warranty.

• The use of this unit without an air distribution duct will void

the warranty.

• It is strictly forbidden to use jumpers to simulate heat demand.

• Risk of electrical shock. Disconnect power before installation,

servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electrical
shock causing severe injuries or death.

• When performing installation, servicing or cleaning the unit,

it is recommended to wear safety glasses and gloves.

• To assure a proper performance of your furnace, we recommend

that you use high quality name brand thermostats.

• When applicable local regulation comprises more restrictive

installation and/or certification requirements, the aforementioned
requirements prevail on those of this document and the
installer agrees to conform to these at his own expenses.

• For your safety, do not store or use gasoline or other flammable

liquids and vapors in the vicinity of this unit or any other
appliance.

• These instructions are intended to be use by qualified personnel

who have been trained in installing this type of furnace.
Installation of this furnace by an unqualified person may
lead to equipment damage and/or hazardous condition
which may lead to bodily harm.

• This furnace is not watertight and is not designed for outdoor

installation. This furnace shall be installed in such a manner
as to protect its electrical components from water. Outdoor
installation leads to a hazardous electrical condition and to
premature furnace failure, thus voiding the warranty.

• Do not block the combustion air openings in the furnace.

Any blockage will result in improper overheat situation and
may result in a fire hazard and/or cause bodily harm.

• The unit must have an uninterrupted or unbroken electrical

ground to minimize personal injury if an electrical fault
should occur. When performing electrical connection, the
ground conductor must be firmly attached to the ground lug
in the furnace.

• Do not use this furnace as a construction heater. Use of this

furnace as a construction heater exposes the furnace to
abnormal conditions, contaminated combustion air and the
lack of air filters. Failure to follow this warning can lead to
premature furnace failure and/or vent failure which could
result in a fire hazard and/or bodily harm.

• The owner and/or the user is responsible of the following:

Always maintain the immediate surrounding of the furnace
free from combustible and highly flammables materials.The
furnace ambient air should not have an excessive dust
concentration and humidity. Never operate this central heating
appliance without an air filter.

• Before performing any service functions, unless operations

specifically require the power to be on, make sure all utilities
are turned “OFF” upstream of the appliance. Failure to comply
with this warning will cause a fire hazard and/or bodily
harm.

• All questions regarding the operation, maintenance or warranty

of this unit should be addressed to the company where this
product has been sold from.

WARNING

IMPORTANT: READ AND SAVE THESE INSTRUCTIONS.

CAUTION

• Never burn garbage or paper in the heating system and never leave rags or paper around the unit.
• Return air grilles and warm air registers must not be obstructed.

IMPORTANT: All local and national code requirements governing the electrical installation heating equipment, wiring and flue connections
must be followed. Some of the codes that may be applicable are:
ANSI/NFPA 70 NATIONAL ELECTRICAL CODE
CSA C22.1 CANADIAN ELECTRICAL CODE
Only the latest issues of the above codes should be used, and are available from either:

The National Fire Protection Agency

Batterymarch Park

Quincy, MA 02269

The Canadian Standards Association

178 Rexdale Blvd.

Rexdale, Ontario M9W 1R3

This furnace has been designed and manufactured to give the
most reliable performance possible. Each unit has been given a
running inspection before shipment to assure that every component
is operating efficiently.

The safe and dependable operation of the furnace depends upon
proper installation and compliance with all national and local
codes and standards.

INSTALLATION AND OPERATING INSTRUCTIONS

FRONT VIEW

RIGHT

IDE VIEW

REAR VIEW

LEFT

IDE VIEW

TOP VIEW

1½

”

(

mm)

1½

”

(

mm)

”

(50

mm)

”

(50

mm)

”

(25 mm)

”

(991 mm)

FILTER FRAME
(EITHER

IDE, REAR

OR BOTTOM)

1½

”

x 1½

”

(

mm x

mm)

1½

”

x 1½

”

(

mm x

mm)

1½

”

x 1½

”

(

mm x

mm)

WIRING KO’

A
B

WIRING KO’

A = 1

”

(25 mm)

B = 1/4

”

(6 mm) & 1¼

”

(

2 mm)

C = 1/2

”

mm) & 1½

”

(

mm)

WIRING KO’

VALUE

CHARGE

”

x 17

”

2 mm x 4

2 mm)

8”

x 1

8”

(457 mm x 457 mm)

RETURN

8”

x 1

8”

(457 mm x 457 mm)

RETURN

8”

x 1

8”

(457 mm x 457 mm)

RETURN

1. LOCATION – The furnace should be centrally located to the

heating area.

2. POSITIONS – It can be installed for vertical, horizontal or

downflow operation. When installed horizontally, the furnace
should be positioned such as the door will not end up being on
the top. The door should be on the side of the furnace, to
ensure that the motor bearings are in their designed position.
In vertical downflow installations, use only “L”- or “T”-shaped
plenum with no openings or registers directly below furnace.

3. INSTALLATION CLEARANCES – As shipped from the factory,

each unit is approved for “zero inch” clearance. If additional
clearance is required, it will be indicated on the data label
attached to the furnace.

4. TEMPERATURE RISE – Furnaces are shipped to operate at

0.20” W.C. (50 Pa) external static pressure. They are certified
for operation up to 0.50” W.C. (125 Pa). Check the following
page for temperature rise table on specification chart and, if
necessary, adjust the unit to match.

5. SERVICE CLEARANCE – Units are serviced from the FRONT.

Leave at least 24” (610 mm) clearance in front of the door.

GENERAL REQUIREMENTS AND SPECIFICATIONS

CAUTION

This unit must be installed in a dry place, in a non-corrosive, well-ventilated environment, without excessive dust. The ambient
temperature must be over 10°C and under 27°C. If the ambient temperature is 10°C or less, the plenum must be insulated on
10 ft linear minimum length.

UNIT CERTIFICATION

This furnace is CSA certified.

GENERAL REQUIREMENTS AND SPECIFICATIONS

(CONT’D)

OPERATING OPTIONS

The furnace is shipped from the factory in a “Standard Heating
Mode” (both switches in the Down position). When the thermostat
calls for heat, the automatic controls will be activated and the
furnace turns “ON”.

The blower will run at low speed or higher speed (as selected by

PEED

ELECTOR

switch).

As the furnace heats up, it automatically switches to a medium
speed when additional elements are activated by the electronic
control, if it was initially set to run at low speed. The timing of this
blower speed change will depend on whether

OLD

ILD

selected on the

EASON

ELECT

switch.

You may, however, change from the Standard Heating Mode by
using the controls built into your furnace.

PEED

ELECTOR

EASON

ELECT

IGH

ILD

OLD

The

PEED

ELECTOR

switch is used to control the fan speed

(ventilation). Even if there is no call for heat, the ventilation can be
controlled by the thermostat; the fan speed is determined by this
switch.

–

The blower motor will operate at low speed.

IGH

–

The blower motor will operate at a higher speed.

During spring or fall, you may require less rapid response when
the thermostat calls for heat.
When

ILD

is selected, it takes more time to bring all the elements

online.

When

OLD

is selected, the heating elements come online faster.

*FACTORY SETTINGS.
SUBJECT TO CHANGE WITHOUT NOTICE.

**This speed can only be run with heater off, for cooling/ventilation purposes only.

WARNING:

240 VOLTS – SINGLE PHASE

TEMP. RISE @ 0.20 in. W.C.

MODEL NO.

BTUH AMPS INCL. MOTOR

BLOWER

°C

°F

*SPEED

RPM

21ECM10

34120

1/3

10” x 8”

(254 mm x 203 mm)

MEDIUM

903

21ECM15

51180

1/3

MEDIUM

903

21ECM18

61420

1/3

MEDIUM

903

21ECM20

68240

1/3

MEDIUM

903

21ECM23

22.5 76770

1/3

MEDIUM

903

10” x 8” (254 mm x 203 mm) BLOWER

SPEED

FLOW RATE

STATIC PRESSURE

(INCHES OF WATER COLUMN)

0.2

0.3

0.4

0.5

0.6

LOW**

CFM

L/s

684
323

582
275

535
252

481
227

429
202

MEDIUM

CFM

L/s

1149

542

1104

521

1064

502

1016

479

977
461

HIGH

CFM

L/s

1238

584

1203

568

1174

554

1139

538

1106

522

ILD

EASON

(First Stage)

Slow Response Sequence

OLD

EASON

(Second Stage)

Rapid Response Sequence

Element 1 - Heat on instantly

Blower on after 3 seconds delay

Blower on after a 3 seconds delay

Elements 3 and 5 after 1 minute delay Elements 3 and 5 after 10 seconds delay

Element 2 after 2 minutes delay

Element 2 after 20 seconds delay

Element 4 after 3-minute delay

Element 4 after 30 seconds delay

NOTE: Elements 4 and 5 only where applicable.

INSTALLATION NOTES

1. COLD AIR RETURN

The duct can be attached to either side, rear or the bottom of
the furnace.

For side return there are four 1½” (38 mm) knockouts which
can be removed and used as an outline for cutting a 18” x 18”
(457 mm x 457 mm) return air opening in the furnace left or
right side. Mount the filter frame to the furnace over the opening
with the open side of the frame facing front. Then attach the
19” x 19” (483 mm x 483 mm) air duct to the flanges on the
filter frame. For bottom mounting, remove the screws holding
the bottom plate to the furnace, discard the bottom plate and
attach the filter frame to the bottom flanges with the open side
of the frame facing front.

2. ELECTRICAL WIRING - POWER SUPPLY

The furnaces are completely factory wired. From a separate
breaker, a two-wire plus ground supply wire is required. The
ground conductor must be firmly attached to the ground lug in
the furnace and the supply wires to the terminal block in the
furnace.

NOTE:

If a FK120 ECM kit will be used to supply an air cleaner
and/or humidifier, a third (neutral) conductor must be
brought into the furnace.

3. CONNECTING AND ADJUSTING

THE LOW VOLTAGE THERMOSTAT

(Use only class 1 wires inside furnace compartments.)
Attach thermostat wires to the low voltage terminal
connections located on the printed circuit board inside the
furnace. Follow the diagrams supplied with the thermostat. As
a general guide, remember that the R & W terminals control
single stage heating; the R & Y terminals control cooling. Single
stage cooling uses “Y/Y2” as first and only stage.

Two-stage cooling uses “Y1” as first stage and “Y/Y2” as
second stage. Make sure the thermostat is levelled on the wall
and in appropriate location as per instructions supplied with the
thermostat.

Because each installation is different an accurate reading of
the current draw should be made with an AC meter. Set the
meter at a 2 A range.
A. Set the anticipator at its highest setting.
B. Disconnect the “W1” thermostat wire from the furnace low

voltage terminal connections.

C. Connect the AC meter between the “W1” terminal on the

board and the loose “W1” wire.

D. Turn the thermostat up to start the furnace and allow it to

run, with all elements on, for three or four minutes.

E. Read the current draw on the meter and reset the anticipator

to match the meter reading.

FOR USE IN MOBILE HOMES

ECM Series furnaces models 21ECM10, 21ECM15, 21ECM18
and 21ECM20 are certified for “L” -shape and “T”-shape shallow duct
installation with model FSB-1 sub-base in downflow applications
when the supply air ducts pass through the floor of the structure.
Recommended size of a floor opening: 14¼” x 14¼” (362 mm x 362 mm).
The duct system must be designed so that the external static
pressure of the system does not exceed the maximum external
static pressure of 0.50” W.C. (125 Pa).

SHALLOW DUCT AREA REQUIREMENTS

Duct Depth

Duct Width

4” (102 mm)

16” (406 mm)

5” (127 mm)

13” (330 mm)

6” (152 mm)

10” (254 mm)

CAUTION

Before turning the furnace on, the heat anticipator in the
thermostat must be properly set to prevent its failure and to
assure comfortable, economical heating.

WARNING

For all installations, we only recommend appropriate gauge
good quality copper wire(s). However, it is the electrician

’

responsibility to ensure that the wiring and connections are
compliant to the latest editions of the Canadian Electrical
Code and local codes.

USING OPTIONAL EQUIPMENT

1. TWO-STAGE OR OUTDOOR THERMOSTAT

(The

EASON

ELECT

switch must be in the

ILD

position).

Follow the directions supplied with the two-stage or outdoor
thermostat in conjunction with the furnace wiring diagram.

2. AIR CONDITIONING

Your furnace is equipped with all the controls required for the
addition of air conditioning (except the heat-cool thermostat).

The evaporator coil may be installed by a local contractor in
sheet metal plenum of his own manufacture. The coil should be
located: Centered over the “chimney” of the furnace 4” (102 mm)
to 6” (152 mm) above the top of the furnace.

Make sure no air is allowed to bypass the cooling coil during
cooling operation. If the discharge opening is a great deal larger
than the coil, and the ductwork is correspondingly larger than
the coil, you may want to use a bypass damper for heating. The
damper would be closed in summer, directing all air flow
through the coil. In winter the damper would be open to allow
air to bypass the coil.

Typical air-conditioning field wiring connections are shown in
the following diagram:

3. ELECTRONIC AIR CLEANERS AND/OR POWERED

FURNACE HUMIDIFIERS

These units operate at 120 V. Your 240 V furnace is designed
so that Model FK120 ECM adaptor kit can be mounted inside
the furnace to supply the required 120 V. Instructions for
mounting and wiring are included with the kit.

4. INTERLOCK CONNECTION

When the electric furnace is used in combination with another
device (as for example, a wood burning furnace), it is
recommended to perform the connection by referring to the
wiring diagram below. The burning furnace thermostat will then
turn automatically on the blower in the electric furnace.

MAINTENANCE

MOTOR: The motor is lubricated for life and needs no oiling.

FILTERS: Size is 20” x 20” x 1” (508 mm x 508 mm x 25 mm).

Should be inspected and replaced when dirty.
Ordinarily replacement is required twice per heating
season and, perhaps, a third time if continuous
blower operation is used.

NOTE:

Each element has an automatic reset thermal
cut-out which is set to open at 160°F (71°C). If it opens,
the element will be de-energized until the cut-out resets
itself. In addition to that, there are 2 manual reset thermal
cut-outs that

open

at 200°F (93°C). If any of them open,

a front panel needs to be removed so the cut-out can be
manually reset.

The reason for the failure should be investigated before
re-starting the furnace. Th

e limit usually opens when

airflow is reduced because of blocked ductwork or very
dirty filters.

FURNACE

THERMO

TAT

CONDEN

FE0002A

WIRING COLOR CODES

COMMON GREEN

RED

WHITE

(BLUE

OPTIONAL)

YELLOW

WARNING

Cut 240 V supply before removing the front panel!

24 VAC
Power O

ll for FAN

Thermo

Rel

COM

Extern

l Re

for F

n Activ

tion

Electric Furnace

tem

SERVICE PARTS

REPLACEMENT PARTS

KEY NO.

PART NO.

DESCRIPTION

30270032

Automatic Limit

30030006

Season Select Sw

itch

30030025

Speed Selector Switch

30280021

Thermostat Indicator Light

10941289

Motor 1/3 HP208/230 V for 21ECM10 and 21ECM15

10941290

Motor 1/3 HP208/230 V for 21ECM18/20/23

10940080

Element Assembly 5000 W, 240 V

10940081

Element Assembly 4500 W, 240 V

30274131

20 A Relay

30274132

30 A Relay

30280020

Manual Reset Limit

624665

Electronic Control (PC Board)

30300022

Transformer 240 V

30010010

Fiberglass Filter 20” x 20” x 1” (508 mm x 508 mm x 25 mm)

10941291

Service Blower Assembly for 21ECM10 and 21ECM15

10941292

Service Blower Assembly for 21ECM18/20/23

15*

624664

Daughterboard (21ECM23 only)

16*

FK120 ECM

120 Volt Kit (optional, purchase separately)

* Item not shown.

EPLACEMENT

ARTS AND

EPAIR

In order to ensure your unit remains in good working condition, you must use Broan-NuTone genuine replacement parts only. The
Broan-NuTone genuine replacement parts are specially designed for each unit and are manufactured to comply with all the applicable
certification standards and maintain a high standard of safety. Any third party replacement part used may cause serious damage and
drastically reduce the performance level of your unit, which will result in premature failing. Also, Broan-NuTone recommends to
contact a certified service depot for all replacement parts and repair.

WIRING DIAGRAMS

For the

e of

two-

ge he

t thermo

t or

n o

tdoor thermo

t, connect

etween W1

nd W2. M

re th

t the

elect

witch i

et to the

“

Mild

”

ition.

BLACK

MED-HI

BLUE

MED-LO

YELLOW

RED

FAN MOTOR

PEED COLOR

WIRING COLOR CODE

BLK BLACK
BLU BLUE
BRN BROWN
GRN GREEN
GRY GREY
ORG ORANGE
PNK PINK
PPL PURPLE
RED RED
WHT WHITE
YEL YELLOW

LEGEND

F1 F

E He

ting Element

KC He

ting Element

Rel

K F

n Rel

HTL A

to-Re

Therm

l Protector

MRHTL M

l Re

Therm

l Protector

M F

n Motor

TB Termin

l Block

T Tr

former Cl

ass

HEAT He

L1, L2

240 V Line

pply

N Ne

KC3

HEAT 3

HEAT 1

HEAT 2

KC2

KC1

24 VAC
COMMON OUT

FUSED 24 VAC
POWER OUT

CALL FOR FAN

CALL FOR COOL

REVERSING VALVE

CALL FOR HEAT 1

CALL FOR HEAT 2

CALL FOR COOL 1

BOARD POWER

SUPPLY

POWE

VOU

24VDC

HTL

COM

Class 2 Transformer

Pri: 240 V 60 Hz

Sec: 24 V 60 Hz 40 VA

YEL

RED

BLK

RED

BLK

RED

BLK

HEAT 3

HEAT 2

HEAT 1

PNK

BRN

GRY

WHT

YEL

WHT

BLK

PPL

VENTILATION SPEED

MED-LO

24VDC

PNK

RED

YEL

BLU

ORG

WHT

GRY

PNK

HEAT INDICATOR

SEASON SELECT

GRY

PPL

BLK

BLK
BLK

BLK

YEL

13 C

BLK (HI)

BLU (MED-HI)

RED (LO)

YEL (MED-LO)

WHT

BLK

RED

ORG

BLK

P2-8

P2-4

P2-3

P2-2

P2-1

P2-5

P2-6

P2-7

C=COM
L=LINE
G=GROUND
N=NEUTRAL

1=LO
2=MED HI
3=MED HI
4=HI
5=HI

15 kW 240 VAC

Single phase

RED

Y/Y2

5 AMPS

P3-1 P3-2

P3-3

P3-4 P3-5 P3-6 P3-7

GRY

BRN

PNK

Open: 93.3°C (200°F)

MRHTL2

WHT

RED

MRHTL1

WHT

Line voltage wiring:
UL AWM 1015/1230, 600V, 105°C,
VW-1,12 AWG;
C

A TEW 600V, 105°C,

FT1, 12 AWG.

Low voltage wiring:

ame rating

high voltage except 18 AWG.

Critic

l Ch

cteri

tic

1. If any of the original wire, a

upplied, mu

t be replaced,

e the

ame equivalent wire.

Wiring mu

t comply with

applicable code

, ordinance

and regulation

2. Field wiring mu

t comply

with applicable code

ordinance

and regulation

e only Cla

1 wiring

ide furnace compartment

KC3

HEAT 3

HEAT 1

KC1

VAC

24 VAC
COMMON OUT

FUSED 24VAC
POWER OUT

CALL FOR FAN

CALL FOR COOL

REVERSING VALVE

CALL FOR HEAT 1

CALL FOR HEAT 2

CALL FOR COOL 1

BOARD POWER

SUPPLY

POWE

EAT

VOU

24VDC

HTL

COM

Class 2 Transformer

Pri: 240 V 60Hz

Sec: 24 V 60Hz 40 VA

YEL

RED

BLK

RED

BLK

HEAT 3

HEAT 1

PNK

GRY

WHT

YEL

WHT

BLK

PPL

VENTILATION SPEED

MED-LO

24VDC

PNK

RED

YEL

BLU

ORG

WHT

GRY

PNK

HEAT INDICATOR

SEASON SELECT

GRY

PPL

BLK

YEL

13 HE

BLK (HI)

BLU (MED-HI)

RED (LO)

YEL (MED-LO)

WHT

BLK

RED

ORG

BLK

P2-8

P2-4

P2-3

P2-2

P2-1

P2-5

P2-6

P2-7

C=COM
L=LINE
G=GROUND
N=NEUTRAL

1=LO
2=MED HI
3=MED HI
4=HI
5=HI

10 kW 240 VAC

Single phase

RED

Y/Y2

5 AMPS

P3-1 P3-2

P3-3

P3-4 P3-5 P3-6 P3-7

GRY

PNK

Open: 93.3°C (200°F)

MRHTL2

WHT

RED

MRHTL1

WHT

WARNING

Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels before
operating. Failure to do so can result in electric shock causing severe injuries or death.

WIRING DIAGRAMS

(CONT’D)

Line voltage wiring:
UL AWM 1015/1230, 600V, 105°C, VW-1,12 AWG;
C

A TEW 600V, 105°C, FT1, 12 AWG.

Low voltage wiring:

ame rating

high voltage

except 18 AWG.

Critic

l Ch

cteri

tic

1. If any of the original wire, a

upplied, mu

t be

replaced, u

e the

ame equivalent wire. Wiring

t comply with applicable code

, ordinance

and regulation

2. Field wiring mu

t comply with applicable code

ordinance

and regulation

. U

e only Cla

wiring in

ide furnace compartment

For the

e of

two-

ge he

t thermo

t or

n o

tdoor thermo

t, connect

etween W1

nd W2. M

re th

t the

elect

witch i

et to the

“

Mild

”

ition.

HI BLACK
MED-HIGH

BLUE

MED-LOW

YELLOW

LOW RED

FAN MOTOR

PEED COLOR

WIRING COLOR CODE

BLK BLACK
BLU BLUE
BRN BROWN
GRN GREEN
GRY GREY
ORG ORANGE
PNK PINK
PPL PURPLE
RED RED
WHT WHITE
YEL YELLOW

LEGEND

F1 F

E He

ting Element

KC He

ting Element

Rel

K F

n Rel

HTL A

to-Re

Therm

l Protector

MRHTL M

l Re

Therm

l Protector

M F

n Motor

TB Termin

l Block

T Tr

former Cl

ass

HEAT He

L1, L2

240 V Line

pply

N Ne

HEAT 4

HTL

KC4

KC3

HEAT 3

HEAT 1

HEAT 2

KC2

KC1

24 VAC
COMMON OUT

FUSED 24VAC
POWER OUT

CALL FOR FA

CALL FOR COOL

REVERSING VALVE

CALL FOR HEAT 1

CALL FOR HEAT 2

CALL FOR COOL 1

BOARD POWER

SUPPLY

POWER

HEAT

HEA

HEAT

VOUT

24VDC

HTL

COM

Class 2 Transformer

Pri: 240 V 60 Hz

Sec: 24 V 60 Hz 40 VA

YEL

RED

BLK

RED

BLK

RED

BLK

BLK

HEAT 4

HEAT 3

HEAT 2

HEAT 1

PNK

BRN

GRY

YEL

WHT

BLK

PPL

VENTILATION SPEED

MED-LO

24VDC

PNK

RED

YEL

BLU

ORG

WHT

GRY

PNK

HEAT INDICATOR

SEASON SELECT

GRY

PPL

BLK

BLK
BLK

BLK

RED

YEL

PPL

X13

13 H

3 CO

BLK (HI)

BLU (MED-HI)

RED (LO)

YEL (MED-LO)

WHT

BLK

RED

ORG

BLK

P2-8

P2-4

P2-3

P2-2

P2-1

P2-5

P2-6

P2-7

C=COM
L=LINE
G=GROUND
N=NEUTRAL

1=LO
2=MED HI
3=MED HI
4=HI
5=HI

18/20 kW 240 VAC

Single phase

RED

BLK

5 AMPS

P3-1 P3-2

P3-3

P3-4 P3-5 P3-6 P3-7

WHT

GRY

BRN

PNK

PPL

Open: 93.3°C (200°F)

MRHTL2

WHT

MRHTL1

WHT

WARNING

WIRING DIAGRAMS

(CONT’D)

Line voltage wiring:
UL AWM 1015/1230, 600V, 105°C, VW-1,12 AWG;
C

A TEW 600V, 105°C, FT1, 12 AWG.

Low voltage wiring:

ame rating

high voltage

except 18 AWG.

Critic

l Ch

cteri

tic

1. If any of the original wire, a

upplied, mu

t be

replaced, u

e the

ame equivalent wire. Wiring

t comply with applicable code

, ordinance

and regulation

2. Field wiring mu

t comply with applicable code

ordinance

and regulation

. U

e only Cla

wiring in

ide furnace compartment

For the

e of

two-

ge he

t thermo

t or

n o

tdoor thermo

t, connect

etween W1

nd W2. M

re th

t the

elect

witch i

et to the

“

Mild

”

ition.

HI BLACK
MED-HIGH

BLUE

MED-LOW

YELLOW

LOW RED

FAN MOTOR

PEED COLOR

WIRING COLOR CODE

BLK BLACK
BLU BLUE
BRN BROWN
GRN GREEN
GRY GREY
ORG ORANGE
PNK PINK
PPL PURPLE
RED RED
WHT WHITE
YEL YELLOW

LEGEND

F1 F

E He

ting Element

KC He

ting Element

Rel

K F

n Rel

HTL A

to-Re

Therm

l Protector

MRHTL M

l Re

Therm

l Protector

M F

n Motor

TB Termin

l Block

T Tr

former Cl

ass

HEAT He

L1, L2

240 V Line

pply

N Ne

HEAT 4

HTL

KC4

KC3

HEAT 3

HEAT 1

HEAT 2

KC2

KC1

24 V

24VAC
COMMON OUT

FUSED 24 VAC
POWER OUT

CALL FOR FAN

CALL FOR COOL.

REVERSING VALVE

CALL FOR HEAT 1

CALL FOR HEAT 2

CALL FOR COOL 1

BOARD POWER

SUPPLY

POWER

HEAT 3

HEAT 4

24VDC

HTL

COM

Class 2 Transformer

Pri: 240 V 60 Hz

Sec: 24 V 60 Hz 40 VA

YEL

RED

BLK

RED

BLK

RED

BLK

BLK

BLK

PPL

HEAT 4

HEAT 3

HEAT 2

HEAT 1

PNK

BRN

GRY

WHT

YEL

WHT

BLK

PPL

VENTILATION SPEED

MED-LO

24VDC

PNK

RED

YEL

BLU

ORG

WHT

GRY

PNK

HEAT INDICATOR

SEASON SELECT

GRY

PPL

BLK

BLK
BLK

BLK

RED

YEL

Open: 93.3°C (200°F)

MRHTL1

WHT

PPL

PNK

13 C

13 H

OOL

L2C

BLK (HI)

BLU (MED-HI)

RED (LO)

YEL (MED-LO)

WHT

BLK

RED

ORG

BLK

P2-8

P2-4

P2-3

P2-2

P2-1

P2-5

P2-6

P2-7

COM

KC5

HEAT 5

MRHTL2

C=COM
L=LINE
G=GROUND
N=NEUTRAL

1=LO
2=MED HI
3=MED HI
4=HI
5=HI

23 kW 240 VAC

Single phase

RED

BLK

24VDC

P2-3

P2-2

P2-1

P1-4

P1-3

P1-2

P1-1

24V

regulated

RLY PWR2

Heater

Logic

HEAT6 IN

HEAT5 IN

HEAT6

HEAT5

HEAT 5

RED

HTL

5 AMPS

P3-1 P3-2

P3-3

P3-4

P3-5 P3-6

P3-7

GRY

PNK

WHT

PNK

PPL

GRY

PPL

WHT

GRY

BRN

PNK

WHT

BLK

WHT

WARNING

The first step in identifying an operational problem is to determine
whether the fault is in the furnace or in the thermostat and/or its
connecting wiring.

To help make this determination, the furnace is equipped with a
“Thermostat ON” diagnostic light. If the light is “ON”, it indicates
the thermostat has closed and is calling for heat; the blower
should be running. If the light is “OFF”, the furnace should not be
operating.

1. If the furnace will not start:

Turn the thermostat to its highest setting. If the light goes on,
the thermostat has closed, so the fault is in the furnace. If the
light does not go on, the thermostat or its connecting wiring is
the problem.

2. If the furnace will not turn off:

Turn the thermostat to its lowest setting. If the light goes off and
the furnace continues to run, the thermostat has opened properly
and the fault is in the furnace. If the light stays on, the fault is
in the thermostat or its connecting wiring.

After the fault area is isolated by use of the diagnostic light, a check
of the following components can be made more efficiently.

TROUBLESHOOTING

PROBLEM

POSSIBLE DEFECTIVE PARTS OR COMPONENTS

1. The furnace will not turn on

• Thermostat
• Circuit breaker or fuse is open
• Motor

•

PEED

ELECTOR

switch (open contact)

• Electronic control
• Transformer

2. Motor runs continuously

• Thermostat wires incorrectly attached to furnace

3. Elements on, but motor does not run

• Motor

•

PEED

ELECTOR

switch (open contact)

• Electronic control

4. Motor going on and off in short cycles

(or in too long cycles)

• Heat anticipator in thermostat incorrectly set

or may be defective

5. Must set thermostat much higher (or lower)

than the desired house temperature

• Thermostat is not leveled or out of calibration

6. Not enough heat

• One or more defective elements or relays
•

EASON

ELECT

switch in

ILD

positio

• Safety limits opening because duct obstruction

or dirty filters are restricting air flow

• Defective or incorrectly wired two-stage

or outdoor thermostat

• Lack of enough cold air returns in house

7. Two-stage or outdoor thermostat not operating properly •

EASON

ELECT

switch not in

ILD

positio

SIXTY-MONTH LIMITED WARRANTY FOR NORTRON PRODUCTS

Broan-NuTone Canada (Broan-NuTone) warrants to the original consumer purchaser of Notron products that such products will be free from defects in
materials or workmanship for a period of sixty (60) months from the date of original purchase. THERE ARE NO OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
During this sixty-month period, Broan-NuTone will, at its option, repair or replace without charge, any product or part which is found to be defective under
normal use and service. This product or part should be shipped prepaid by the customer to the company factory or the nearest authorized service center.
THIS WARRANTY DOES NOT EXTEND TO FILTERS, FURNACE KITS SOLD SEPARATELY, DUCTS, AND ACCESSORIES FOR DUCTING. This warranty
does not cover (a) normal maintenance and service or (b) any products or parts which have been subject to misuse, negligence, accident, improper
maintenance or repair (other than by Broan-NuTone), faulty installation or installation contrary to recommended installation instructions. Broan-NuTone
does not accept any responsibility for transportation of repaired part or replaced product mentioned above and for reinstallation costs.
The duration of any implied warranty is limited to the sixty-month period as specified for the express warranty. Some jurisdictions do not allow limitation
on how long an implied warranty lasts, so the above limitation may not apply to you.

BROAN-NUTONE’S OBLIGATION TO REPAIR OR REPLACE, AT BROAN-NUTONE’S OPTION, SHALL BE THE PURCHASER’S SOLE AND
EXCLUSIVE REMEDY UNDER THIS WARRANTY. BROAN-NUTONE SHALL NOT BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL OR SPECIAL
DAMAGES ARISING OUT OF OR IN CONNECTION WITH PRODUCT USE OR PERFORMANCE. Some jurisdictions do not allow the exclusion
or limitation of incidental or consequential dama

es, so the above limitation or exclusion may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights, which vary from province to another. This warranty supersedes all prior
warranties, and applies only in Canada territorial limits.
To qualify for warranty service, you must (a) notify Broan-NuTone at the address or telephone number stated below, (b) give the model number and part
identification and (c) describe the nature of any defect in the product or part. At the time of requesting warranty service, you must present evidence of the
original purchase date.

Broan-NuTone Canada;

1140 Tristar Drive, Mississauga, ON L5T 1H9 www.broan.ca 877-896-1119