Contents

Owners Manual
- NOTE: Read the entire instruction manual before starting the installation.
  - TABLE OF CONTENTS
  - GENERAL FURNACE SAFETY
  - FURNACE COMPONENTS
    - Fig. 1 80% AFUE Single Stage Furnace Components
  - IMPORTANT FACTS (DOS AND DONTS)
  - SAFETY CONSIDERATIONS
  - BEFORE STARTING YOUR FURNACE
    - 1. All flue gas carrying areas external to the furnace (i.e. chimney, vent connector) are clear and free of obstructions.
    - 2. The vent connector is in place, slopes upward and is physically sound without holes or excessive corrosion.
    - 3. The return-air duct connection(s) is physically sound, is sealed to the furnace casing, and terminates outside the space containing the furnace.
    - 4. The physical support of the furnace is sound without sagging cracks, gaps, etc. around the base.
    - 5. There are no obvious signs of deterioration of the furnace.
  - starting your furnace
    - Fig. 2 Do Not Light Burner with Match
  - Steps For Starting Your Furnace
    - 1. Set your room thermostat to the lowest temperature setting, see Fig. 3.
    - Fig. 3 Lowest Temperature Setting
      - 2. Close the external manual gas valve, see Fig. 4.
    - Fig. 4 Close Valve
      - 3. Turn OFF electrical supply to the furnace, see Fig. 5.
    - Fig. 5 Turn Off Electrical Supply
      - 4. Remove the outer door by loosening the thumbscrew and pulling the door forward, see Fig. 6.
    - Fig. 6 Remove Furnace Door
      - 5. Turn the control switch on the gas control to the OFF position and wait 5 minutes, see Fig. 7. Then smell for gas, including near the floor. If you smell gas, STOP! Follow B on furnace label. If you dont smell gas, go to next step.
    - Fig. 7 Control Switch to OFF
      - 6. After waiting 5 minutes, if you still smell gas, STOP! Follow the safety information on the cover of this manual. If you do not smell gas, go to the next step.
      - 7. Turn the control switch to ON, see Fig. 8.
    - Fig. 8 Control Switch to ON
      - 8. Replace the outer door and tighten the thumbscrew, see Fig. 9.
    - Fig. 9 Furnace Door Replaced
      - 9. Turn ON the electrical supply to the furnace, see Fig. 10.
    - Fig. 10 Turn On Electrical Supply
      - 10. Open the external manual gas valve, see Fig. 11.
    - Fig. 11 Open Valve
      - 11. Set the room thermostat to a temperature slightly above the room temperature. This will automatically signal the furnace to start. The inducer motor will start and the hot surface igniter will energize.
      - 12. After about 45 seconds, the gas valve permits gas to flow to the main burners where it is ignited. Hot flames begin to warm the furnaces heat exchanger. After a time delay of approximately 25-45 seconds the furnace blower is switched on.
      - 13. Set your thermostat to the temperature that satisfies your comfort requirements. SUGGESTION: Setting the thermostat back a few degrees and compensating for the difference with warmer clothing can make a big difference in your fuel consumption on ...
  - Shutting Down Your Furnace
    - 1. Set your room thermostat to the lowest temperature setting, see Fig. 3
    - 2. Close the external manual gas valve, see Fig. 4.
    - 3. Turn off electrical supply to the furnace, see Fig. 5.
    - 4. Remove outer furnace door, see Fig. 6.
    - 5. Turn the switch on the gas control to the OFF position, see Fig. 7.
    - 6. Replace the outer furnace door, see Fig. 9.
    - 7. If the furnace is being shut down because of a malfunction, call your dealer as soon as possible.
  - Performing Routine Maintenance
  - Filtering Out Trouble
    - 1. Turn off the electrical supply to the furnace, see Fig. 12.
    - Fig. 12 Turn Off Electrical Supply
      - 2. Remove filter cabinet door/rack.
      - 3. Slide air filter out of filter cabinet. Keep dirty side up (if dirty) to avoid spilling dirt, see Fig. 15 and Fig. 16.
      - 4. Inspect the filter. If torn, replace it.
      - a. Factory specified disposable media filter - Do not clean. If dirty, replace only with media filter having the same part number and size. Install with airflow direction arrow pointing towards blower (some models may vary).
      - b. Electronic Air Cleaner (EAC) - Refer to EAC Owners Manual for maintenance information (not applicable to all models).
      - 5. Wash filter (if dirty) in sink, bathtub, or outside with a garden hose. Always use cold tap water. A mild liquid detergent may be used if necessary. Spray water through filter in the opposite direction of airflow. Allow filter to dry.
      - 6. Reinstall clean air filter.
      - 7. Replace filter cabinet door, see Fig. 17 and Fig. 13.
      - 8. Turn on electrical supply to furnace, see Fig. 10.
    - Fig. 13 Replace Bottom Filter Cabinet Door
    - Table 1 Filter Requirements
  - COMBUSTION AREA AND VENT SYSTEM
    - 1. Turn off electrical supply to the furnace and remove the access door, see Fig. 4 and Fig. 6.
    - 2. Carefully inspect the gas burner for dirt, rust, or scale. Inspect the elbow, flue connection area, and the vent pipe for rust.
    - 3. Inspect the vent pipe for a sag, holes, or a disconnection. A horizontal vent pipe must slope upward away from furnace. If rusty joints or seams, or signs of water leakages are found, call your dealer for service.
    - 4. Restore electrical power to the furnace, see Fig. 10.
    - 5. Start the furnace and observe its operation. If you suspect a malfunction, call your servicing dealer.
    - 6. Replace the access door, see Fig. 9.
  - BEFORE YOU REQUEST A SERVICE CALL
  - MAINTENANCE CHECKLIST
  - A200102

Tempstar F80CSU Owner's Manual

Tempstar F80CSU Gas Furnace manual cover

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Tempstar F80CSU Gas Furnace Specification

The Tempstar F80CSU Gas Furnace is designed to deliver reliable and efficient heating for residential applications. This model is part of Tempstar's Performance Series, known for its balance of performance and affordability. It features a single-stage gas valve operation, providing consistent and quiet comfort throughout the home. The furnace is equipped with a multi-speed ECM blower motor, which enhances energy efficiency and can improve air quality by supporting better air circulation. With an AFUE (Annual Fuel Utilization Efficiency) rating of up to 80%, the F80CSU is capable of converting a significant portion of the fuel consumed into usable heat, making it a cost-effective option for regions with moderate heating needs.

The furnace includes a durable primary heat exchanger made of aluminized steel, designed for long-term reliability and efficient heat transfer. Additionally, a reliable hot surface ignition system is utilized for dependable start-up, eliminating the need for a pilot light and enhancing energy savings. The unit is compatible with various add-ons, such as air purifiers and humidifiers, offering flexibility for improved indoor air quality management.

Tempstar's F80CSU model incorporates user-friendly controls, allowing for straightforward operation and maintenance. It is also designed to fit in tight spaces, providing versatility in installation options. Safety features include a reliable limit switch to prevent overheating and ensure safe operation. With its robust construction and efficiency, the Tempstar F80CSU Gas Furnace is engineered to provide consistent and efficient heating for residential settings, backed by a strong warranty that assures long-term peace of mind for homeowners.

Tempstar F80CSU Gas Furnace F.A.Q.

How do I reset the Tempstar F80CSU Gas Furnace?

To reset the Tempstar F80CSU Gas Furnace, locate the reset button on the furnace control panel. Press and hold the button for about 5-10 seconds until the furnace restarts. If the issue persists, consult the user manual or contact a professional technician.

What should I do if my Tempstar F80CSU furnace is not heating?

First, check if the thermostat is set to 'heat' and at the desired temperature. Ensure that the furnace power switch is on and the circuit breaker is not tripped. Inspect the furnace filter for clogs and replace it if necessary. If the problem continues, consider scheduling a professional inspection.

How often should I replace the air filter in my Tempstar F80CSU furnace?

It is recommended to check and replace the air filter every 1 to 3 months, depending on usage and the type of filter. Regular replacement helps maintain efficient airflow and prolongs the furnace's life.

Why does my Tempstar F80CSU furnace frequently cycle on and off?

Frequent cycling can be caused by a dirty filter, thermostat issues, or improper airflow. Ensure the filter is clean and the thermostat is functioning correctly. If the issue persists, it may be a sign of a more complex problem, and a technician should be consulted.

What maintenance should be performed on a Tempstar F80CSU furnace before winter?

Before winter, clean or replace the air filter, inspect the furnace for any visible damage, check the thermostat settings, and ensure all vents and ducts are unobstructed. It's also advisable to schedule a professional inspection and cleaning for optimal performance.

How can I improve the energy efficiency of my Tempstar F80CSU furnace?

To improve energy efficiency, regularly replace the air filter, seal air leaks in ducts, ensure proper insulation in your home, and consider installing a programmable thermostat. Professional tune-ups can also optimize furnace performance.

What could cause a burning smell when my Tempstar F80CSU furnace is running?

A burning smell can result from dust burning off at the start of the heating season, a clogged filter, or an overheating component. Turn off the furnace and inspect for visible issues. If the smell persists, contact a technician immediately.

Why is my Tempstar F80CSU furnace blowing cold air?

If the furnace is blowing cold air, check that the thermostat is appropriately set to 'heat'. Inspect the pilot light or electronic ignition system for issues. If these are not the cause, there may be a problem with the gas supply or a component malfunction, requiring professional service.

Is it normal for my Tempstar F80CSU furnace to make noise during operation?

Some noise is normal, such as a low hum or the sound of air moving through ducts. However, loud or unusual noises like banging, screeching, or rattling could indicate mechanical issues and should be investigated by a technician.

How can I tell if the blower motor on my Tempstar F80CSU furnace is failing?

Signs of a failing blower motor include unusual noises, reduced airflow, or the furnace shutting off prematurely. If you experience these issues, have a technician assess the motor for potential repair or replacement.