Broan ECM SERIES, Nortron 21ECM10, Nortron 21ECM15, Nortron 21ECM18, Nortron 21ECM20 Installation And Operating Instructions Manual

ECM SERIES ELECTRIC FURNACE

TEL.: [phone]

FAX: [phone]

CUSTOMER SERVICE TEL.: [phone]

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

or

2

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 SIDE VIEW REAR VIEW LEFT SIDE VIEW

TOP VIEW

1½”

(38 mm)

1½”

(38 mm)

20”

(508 mm)

20”

(508 mm)

1”

(25 mm)

39”

(991 mm)

FILTER FRAME
(EITHER SIDE, REAR
OR BOTTOM)

1½” x 1½” KO

(38 mm x 38 mm)

1½” x 1½” KO

(38 mm x 38 mm)

1½” x 1½” KO

(38 mm x 38 mm)

WIRING KO’S

A
B
C

WIRING KO’S

C

A = 1” (25 mm)
B = 1/4” (6 mm) & 1¼” (32 mm)
C = 1/2” (13 mm) & 1½” (38 mm)

WIRING KO’S VALUES

DISCHARGE

17” x 17”

(432 mm x 432 mm)

18” x 18”

(457 mm x 457 mm)

RETURN

18” x 18”

(457 mm x 457 mm)

RETURN

18” x 18”

(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
SPEED SELECTOR 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 C

OLD or MILD is

selected on the SEASON SELECT switch.
You may, however, change from the Standard Heating Mode by

using the controls built into your furnace.

SPEED SELECTOR SEASON SELECT

HIGH

MILD

COLD

The SPEED SELECTOR 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.

L

OW – The blower motor will operate at low speed.

H

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 M

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

online.
When C

OLD is selected, the heating elements come online faster.

3

L

OW

*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. kW BTUH AMPS INCL. MOTOR HP BLOWER °C °F *SPEED RPM

21ECM10 10 34120 43 1/3

10” x 8”

(254 mm x 203 mm)

19 34 MEDIUM 903
21ECM15 15 51180 64 1/3 22 40 MEDIUM 903
21ECM18 18 61420 76 1/3 26 47 MEDIUM 903
21ECM20 20 68240 84 1/3 29 52 MEDIUM 903
21ECM23 22.5 76770 94 1/3 36 65 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

MILD SEASON (First Stage)

Slow Response Sequence

COLD SEASON (Second Stage)

Rapid Response Sequence

Element 1 - Heat on instantly 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.