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INS_SEFL-I 0610

Location

You must install the furnace on a dry and solid base, in an area free of flammable liquids or vapors and combustible materials. You must indicate to the fur-
nace’s user the location of the switches and disconnects. He must be able to quickly identify them in case of an emergency. Moreover, the furnace should be 
located as centrally as possible in the area to heat in order to optimize air dissipation in all the rooms. 

Clearance

This furnace is approved for ‘‘

zero inch

’’ clearance. Meaning that you can install it directly against a wall. Ducts can also be installed with a zero inch clear-

ance (

0 inch

). From 37 inches, this clearance can be reduced to 

0 inch

. Please refer to the codes effective in your region if you have any questions concern-

ing clearances.

Since it is necessary to open the front door to perform the furnace maintenance inspection, you must leave at least a 

24-inch

 clearance in front of this door.

Ducts and filters

Ducts must be designed to deliver airflows to the specified external static pressure. You should insulate the ducts crossing non-heated areas. Moreover, use 
flexible return and supply connectors in order to avoid vibrations as much as possible. To make your furnace even quieter, follow these instructions: 

1) cover the vertical return and supply ducts with soundproofing material; 
2) install at most one or two elbows between registers and the return and supply connectors; 
3) install flexible hangers to suspend the ducts;

All “SEFL” series models are equipped with a filter rack (including the filter) that you will find on top of the furnace. You can install this rack on one of the three 
external sides of the furnace or at its bottom. Using snips, cut the selected rack opening following the slots and holes, and screw the filter rack on it.

Optional accessories

The furnace is equipped with all devices required for the addition of an air-conditioner or heat pump (except the heat-cool thermostat). The refrigerant and 
drainage pipes must be installed either in the furnace’s supply or return duct and should not prevent you from removing the front door of the furnace. 

When the electric furnace is used in combination with a wood heating unit, you must connect the thermostat of the wood heating unit across low voltage 
terminals R and G of the furnace. This thermostat will automatically turn the blower of the furnace on.

N.B. Please note that if one of these accessories is installed, you must refer to the appropriate guide.

ELECTRICAL CONNECTIONS OF THE FURNACE

Note that this product must be connected by a qualified electrician according to the electrical and building codes effective in your region.

This furnace must be connected to a 208/240 volt power source. For 240V power supply, either copper or aluminum wires can be used, except for 27 and 30W 
models where only copper wire can be used (

see appendix 1

). If you want to energize the furnace at 208 VAC, you must change a connection on the trans-

former’s terminal board (

see appendix 1

). Refer to the local and national electrical codes to know which wire size, fuses and circuit breakers are required.

You can also connect a 24 VAC humidifier directly at the 24 VAC power supply of the furnace, i.e. on R and C terminals of the terminal block.

N.B.  To prevent the humidifier from operating when ventilation is not activated, some manufacturers offer a ventilation detector (optional). If 

this option is not available, you must connect the humidifier on W1 and C terminals of the terminal block. In this case, the humidifier will 

only operate when the blower (in the heating mode) is activated. 

ELECTRICAL CONNECTION OF THE THERMOSTAT

The thermostat must be mounted on a connection box, at around 1.5 m (5 feet) above the floor level, on a section of the wall exempt from pipes or air ducts.

Do not install

 the thermostat in a location where temperature measurements could be altered. For example:

- close to a window, on an external wall, or close to a door leading outside; 
- exposed directly to the light or heat of the Sun, a lamp, a fireplace or any other heat source; 
- close or in front of an air outlet; 
- close to concealed ducts or a chimney; and 
- in a location with poor air flow (e.g. behind a door), or with frequent air draft conditions (e.g. head of stairs).

Seal the wall openings in order to minimize the draughts which can alter temperature measurements. Read the user’s guide of the thermostat carefully and 
refer to the following illustrations to connect the thermostat.

C

G

R

W

W1

W2

R

G

Y

C

THERMOSTAT

ELECTRICAL CONNECTION FOR 
ELECTRONIC THERMOSTATS (PLEASE 
VALIDATE THE CONNECTIONS WITH THE 
MANUFACTURER OF THE THERMOSTAT

)

ONE STAGE THERMOSTAT 

ELECTRIC HEAT ONLY

ELECTRIC FURNACE

Summary of Contents for SEFL1521

Page 1: ...y by the installer The installer must also read the user s guide since it contains other important information www stelpro com For further information or to consult this guide on line please visit our Web site This unit complies with the CSA standards This unit is approved according to the Canadian and American manufacturing standards ...

Page 2: ...re wet When cutting a piece of steel for the installation of the return duct do not damage electrical wiring of the unit Because this unit is hot when in use it may pose risks even in normal operation Therefore be careful and responsible when using it To avoid burns do not let bare skin touch hot surfaces Let the unit cool down for a few minutes before handling it it stays warm for some time after...

Page 3: ...INLET KOE SQUARE CARRÉ 1 1 8 KOE O 1 3 8 1 1 8 KOE INSTALLATION N B Cut off power supply at circuit breaker fuse before proceeding to the installation Please note that each furnace is factory inspected before shipping in order to ensure that every component is operating efficiently The SEFL series electric furnace is available in several models of various heating capacity from 15 to 20 kW All thes...

Page 4: ...e airflow can be roughly measured using the measurements taken previously You must use the following formulas LitER s 0 82 x amp X volts CFM 3 1 x amp X volts OTHER CFM kW x 3000 T F T F METHOD T F ANTICIPATOR If you install a thermostat equipped with a heat anticipator refer to the user s guide of the thermostat to adjust it Using an ampmeter measure the current on the single stage thermostat as ...

Page 5: ...f you change the filter frequently the blower s blades and motors will become dust laden after a few months The entire blower assembly should be inspected annually If needed vacuum out the dust If you cannot clean the blower without removing it from the furnace this service must be performed by a qualified technician TROUBLESHOOTING PROBLEM DEFECTIVE PART OR PART TO CHECK The unit does not work De...

Page 6: ...T 010 THERMAL PROTECTION L 160 40 15 TO 20 kW 5 SWI 004 SPDT SWITCH WITHOUT MARKINGS 16 A 250 V 3 4 HP 250 V T85 6 TRF200050D TRANSFO 240 208 24 50VA SEC 10 5 13 7 REL 005 RELAY 240 V form X 18 A RES 7 REL 003 RELAY 24 V form C 20 A NO 10 A NC 8 SEQ 005 DOUBLE SEQUENCER 24 V H1 20 C40 90 H30 90 C1 30 8 SEQ 003 SINGLE SEQUENCER 24 V H30 90 C1 30 8 SEQ 007 DOUBLE SEQUENCER 24 V H40 100 C1 30 H25 60 ...

Page 7: ...elat ing thereto Without limiting the generality of the foregoing Stelpro expressly disclaims any liability for property or personal injury damages penalties special or punitive damages damages for lost profits loss of use of equipment cost of capital cost of substitute products facilities or services shut downs slowdowns or for other types of economic loss or for claims of a dealer s customers or...

Page 8: ...w The chosen angle is where you will feel it with your finger You can modify the angle of the first and second damper but there is a bolt that will block at one limit simply press and turn with a plyer 18 kW 20 kW ML L 15 kW DEFAULT CONFIGURATION MH H C ML L MH H C Red Black Red Black Blue Blue Black White Black White ...

Page 9: ...Im A T F cfm Im A T F cfm Im A T F cfm 0 2 30 30 0 1 2 38 802 1 4 34 896 1 5 34 896 1 8 32 952 0 2 45 45 0 1 4 34 896 1 6 32 952 1 6 28 1088 2 27 1129 0 2 60 60 0 1 6 34 896 1 9 27 1129 2 25 1219 2 3 23 1325 0 2 75 75 0 1 7 33 5 910 2 1 26 1172 2 2 23 1325 2 6 20 1524 0 2 90 90 0 1 7 33 924 2 2 26 1172 2 7 22 1385 2 9 20 1524 0 5 30 30 0 1 45 690 1 1 41 5 748 1 3 38 817 1 6 35 5 874 0 5 45 45 0 1 ...

Page 10: ...ood heating unit across low voltage terminals R and G of the furnace This thermostat will automatically turn the blower of the furnace on N B Please note that if one of these accessories is installed you must refer to the appropriate guide ELECTRICAL CONNECTIONS OF THE FURNACE Note that this product must be connected by a qualified electrician according to the electrical and building codes effecti...

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