To Next PageTo Next PageWhy does my Stelpro Furnace run continuously?
Your Stelpro Furnace might run continuously due to a defective thermostat, incorrect thermostat settings, or positioning. It could also be caused by heat losses exceeding the unit's capacity, a faulty relay, or the thermostat wire being incorrectly connected to the furnace. For suggested solutions, see above: CONTROL CARD AUTODIAGNOSTIC.
Why Stelpro Furnace does not work?
If your Stelpro Furnace isn't working, it could be due to a defective thermostat, incorrect thermostat setting or positioning, an open circuit breaker or fuse, faulty connections, a faulty motor or capacitor, a faulty blower control switch, or a faulty transformer. For suggested solutions, see above: CONTROL CARD AUTODIAGNOSTIC.
Why is my Stelpro Electric furnace not working?
If your Stelpro Electric furnace isn't working, it could be due to a defective thermostat, incorrect thermostat settings, or its positioning. It may also be caused by an open circuit breaker or fuse, faulty connections, a faulty motor or capacitor, a faulty blower control switch, or a faulty transformer. See control card autodiagnostic for suggested solution.
Why can't my Stelpro Electric furnace reach the desired temperature?
If the desired temperature cannot be reached with your Stelpro Electric furnace, it could be due to one or more defective elements, a defective thermostat or incorrect thermostat setting, voltage lower than indicated on the nameplate, heat losses greater than the unit capacity, or a faulty relay.
Why does my Stelpro Electric furnace run continuously?
If your Stelpro Electric furnace runs continuously, the cause may be a defective thermostat, incorrect thermostat settings, or thermostat positioning. It could also be due to heat losses exceeding the unit's capacity, a faulty relay, or the thermostat wire being incorrectly connected to the furnace. See control card autodiagnostic for suggested solution.
What causes overheating in my Stelpro Electric furnace?
Overheating in your Stelpro Electric furnace could stem from a defective thermostat, incorrect thermostat settings, or a defective motor.
What does it mean if my Stelpro Electric furnace cycles under thermal protection?
If your Stelpro Electric furnace cycles under control of the thermal protection (overheat), check the blocked air vents indicator.
This document describes the Stelpro SFECM Series Electric Furnace, a heating unit designed for residential and commercial applications. The furnace is approved according to Canadian and American manufacturing standards, including CSA and UL.
The Stelpro SFECM Series Electric Furnace is a central heating system designed to provide warmth and comfort. It utilizes an efficient ECM motor to maintain constant airflow regardless of static pressure variations in the ducts. The furnace offers various heating capacities, ranging from 10 kW to 30 kW, and is adaptable for horizontal, upflow, and downflow operations. It can be integrated with air conditioning or heat pump systems, and also supports the connection of electronic filters and humidifiers. The unit features a control panel with LEDs for easy diagnostic and mode selection, including continuous ventilation, continuous heating, and Eco mode.
The SFECM series furnaces operate on 240/208 VAC power. Available models and their specifications:
Optional features include a 120V motor (up to 27.5 kW), a 1 HP motor (20 and 22.5 kW), and a neutral terminal junction (SCOND). The transformer primary is factory-set for 240 VAC operation (black and white wires), with an option for 208V connection. The unit is equipped with a plenum temperature sensor, allowing adjustment of the plenum temperature set point from 40°C (104°F) to 70°C (158°F). The furnace includes a filter rack, which can be installed on one of the three external sides or at the bottom of the furnace. Electrical connections for 240 VAC can use copper or aluminum wire (75°C (165°F)), except for 27.5 kW and 30 kW models which require copper wire only.
Installation: The furnace must be installed by a qualified person and connected by a certified electrician in accordance with local electrical and building codes. It requires a dry, solid base, free from flammable liquids or vapors. For vertical downflow installations, only "L" or "T" shaped plenums without openings or registers directly below the unit should be used. Clearance: The furnace is approved for "zero inch" clearance, meaning it can be installed directly against a wall. Ducts for models 22.5 kW and less can also have zero-inch clearance. However, ducts for models 27.5 kW and more require a 1-inch clearance for the first 36 inches, reducing to 0 inch thereafter. A minimum 24-inch clearance in front of the door is required for maintenance access. Ducts and Filters: Ducts should be designed for correct airflow and insulated in non-heated areas. Flexible connectors are recommended to minimize vibrations. Soundproofing material on vertical return and supply ducts, limited elbows, flexible hangers, and baffles in elbows with small curvature radii can further reduce noise. The filter rack can be installed on any of the three external sides or at the bottom. Control Panel: The control panel features buttons and LEDs for various functions:
General Maintenance: Regular cleaning is essential for warranty validity. Before cleaning, cut off power at the circuit breaker/fuse. Use a soft, damp rag and non-abrasive dish soap. Avoid abrasive or chemical cleaners. For dusty locations, use a vacuum brush to remove dust from grilles. Air Filter: The disposable air filter should be replaced two to four times a year, or more frequently in dirtier areas. Never operate the unit without a filter. When changing the filter, check for dust accumulation on components, damaged parts, or water presence. If any issues are found, do not operate the furnace and call a qualified technician. Blower: The blower motor is sealed and permanently lubricated, requiring no lubrication. The blower assembly should be inspected annually for dust accumulation, even with frequent filter changes. Dust should be vacuumed out, and if removal from the furnace is necessary, this must be done by a qualified technician. Troubleshooting: The control card has a pilot LED (item #10 on the control panel) that blinks continuously to indicate electrical problems, aiding in diagnostics. A troubleshooting table is provided to identify defective parts or areas to check for common issues like the unit not working, continuous running, cycling under thermal protection, overheating, breaker trips, motor not working, or inability to reach desired room temperature. Anticipator (Thermostat): For thermostats with a heat anticipator, adjust it by setting it to the highest setting, disconnecting the W1 wire and connecting an ampmeter, increasing the thermostat set point to call for heat, letting the furnace run for 3-4 minutes to reach full capacity, and then adjusting the anticipator to the stable current reading. High Limit Thermal Protections: To verify, run the furnace at full capacity for 10 minutes, block air openings, and measure the supply air temperature. Elements should shut down one by one before the temperature exceeds 95°C (200°F).
Warranty: Stelpro offers a 5-year limited warranty on products and components against defects in workmanship and materials from the date of purchase. The warranty applies only to the original purchaser. Claims require an invoice and product nameplate information. Repairs must be authorized in writing by Stelpro.
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