Contents

Owners Information Manual
- A170030
- Fig. 1 Unit PDD4, PDS4
Safety Considerations
- NOTE: Installer: This manual should be left with the equipment user.
  - 1. Do not turn off the electrical power to unit without first turning off the gas supply.
  - 2. Before attempting to start the gas heating section, familiarize yourself with all the procedures that must be followed.
Unit Introduction
- Starting or Shutting Off Unit
- NOTE: Your combination heating/cooling unit is equipped with an automatic direct spark ignition and power combustion blower.
  - 1. Set the temperature selector on room thermostat to the lowest temperature setting and set system switch to Emergency Heat.
  - 2. Close the external manual gas shutoff valve.
  - 3. Turn off the electrical supply to the unit.
  - 4. Remove the control access panel with a 5/16-in. nut driver. (See Fig. 2.)
  - Fig. 2 Unit Access Panels
    - 5. Move the selector switch on the internal gas valve to the OFF position and wait 5 minutes.
    - 6. Move the selector switch on the internal gas valve to the ON position.
    - 7. Replace the control access panel.
    - 8. Turn on the electrical supply to unit.
    - 9. Open the external manual gas shutoff valve.
    - 10. Set the temperature selector on room thermostat slightly above room temperature to start unit. The induced-draft combustion air fan will start. Main gas valve will open and main burners should ignite within 5 seconds. If the burner does not light...
    - 11. Set the temperature selector on room thermostat to desired setting.
      - 1. If the main burners fail to light, or the blower fails to start, shut down gas heating section and call your dealer for service.
      - 2. Never attempt to manually light the main burners on unit with a match, lighter, or any other flame. If the electric sparking device fails to light the main burners, refer to the following shutdown procedures, then call your dealer as soon as possible
  - Fig. 3 Gas Heating/Electric Cooling Unit with Access Panel Removed
  - To shut off unit gas heat:
- NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible.
  - 1. Set the temperature selector on room thermostat to lowest temperature setting and set system SWITCH to OFF.
  - 2. Close the external manual shutoff valve.
  - 3. Turn off the electrical power supply to the unit.
  - 4. Remove the control access panel. (See Fig. 2.)
  - 5. Move the selector switch on the internal gas valve to the OFF position.
  - 6. Replace the control access panel.
  - A07662
  - Fig. 4 To Start Unit Gas Heat
    - A07663
  - Fig. 5 To Shut Off Unit Gas Heat
    - A09194
  - Fig. 6 To Start Unit Electric Cooling
    - A07797
  - Fig. 7 To Shut Off Unit Electric Cooling
    - To start unit electric cooling:
      - 1. Set the temperature selector on room thermostat to highest temperature setting and set system SWITCH to OFF.
      - 2. Close the external manual shutoff valve, if not already closed.
      - 3. Turn ON the electrical power supply to the unit.
      - 4. Set system switch to COOL.
      - 5. Set the temperature selector on room thermostat slightly below the room temperature to start unit.
    - To shut off unit electric cooling:
      - 1. Set the temperature selector on room thermostat to highest temperature setting and set system SWITCH to OFF.
      - 2. Close the external manual shutoff valve, if not already closed.
      - 3. Turn off the electrical power supply to the unit.
- NOTE: Heat Pump heating mode procedure is similar to electric cooling mode except thermostat mode is HEAT and thermostat must operate on first stage heating above the balance point that has been determined by the Dealer.
Operating Your Unit
- 1. During heat pump heating, increasing the thermostat setting more than 2F (1.1C) may cause the supplemental gas heat to be turned on for a short period of time to satisfy the thermostat. Needless use of the supplementary heat reduces potential ...
- 2. Ice or frost tends to form on the coil during winter heating operation. Your heat pump is designed to automatically melt the ice. When in this defrost cycle, it is normal for steam or fog to rise from the outdoor unit. Do not be alarmed!
- Cooling Mode
- Heat Pump Heating Mode
- Gas Heat Mode
- Defrost Mode
- Emergency Heat Mode
Maintenance and Service
- Routine Maintenance
- Maintenance and Care for the Equipment Owner
  - 1. Turn off gas supply first, then all electrical power to your unit and install lock--out tag before servicing or performing maintenance.
  - 2. When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reachi...
  - Air Filters
    - Table 1 Replacement Filter Sizes
      - 1. Remove the filter access panel using a 5/16-in. nut driver.
      - 2. Remove the filter(s) by pulling it out of the unit. If the filter(s) is dirty, clean or replace with a new one.
      - 3. Reinstall filter access panel ensuring opening is air and watertight.
- Replacing or inspecting filters in units with economizers
  - Small Chassis (See Fig. 8)
    - 1. Remove return air duct cover at rear of unit using a 5/16-in. nut driver.
    - 2. Remove the filter(s) by pulling it out and through the unit duct opening. If filter is dirty, replace both filters with new ones.
    - 3. Reinstall duct cover ensuring opening is air and watertight.
  - Large Chassis (See Fig. 9)
    - 1. Remove filter access door using a 5/16-in. nut driver.
    - 2. Remove the filter(s) by pulling it out and through the unit filter access door. If filter is dirty, replace both filters with new ones.
    - 3. Reinstall filter access door ensuring opening is air and watertight.
    - Fig. 8 Small Chassis Filter Access
    - Fig. 9 Large Chassis Filter Access
  - Fans and Fan Motors
  - Indoor and Outdoor Coils
  - Condensate Drain
  - Compressor
  - Condenser (Outdoor) Fan
- Electrical Controls and Wiring
- Refrigerant Circuit
- Unit Panels
- Combustion Area and Vent System
  - Regular Dealer Maintenance (Also refer to (Table 2))
    - 1. Inspection of all flue product passages-including the burners, heat exchanger, and flue collector box, Mare sure the burner flames are blue in color and in proper adjustment. Refer to Fig. 10 for burner flame.
    - 2. Inspection of all combustion-and ventilation-air passages and openings.
    - 3. Close inspection of all gas pipes leading to and inside of your unit.
    - 4. Inspection and, if required, cleaning of the outdoor and indoor coils.
    - 5. Inspection and, if required, cleaning of the indoor coil condensate drain pan.
    - 6. Inspection and cleaning of blower wheel housing and motor.
    - 7. Inspection of all supply-air and return-air ducts for leaks, obstructions, and insulation integrity. Any problems found should be resolved at this time.
    - 8. Inspection of the unit base to ensure that no cracks, gaps, etc., exist which may cause a hazardous condition.
    - 9. Inspection of the unit casing for signs of deterioration.
    - 10. Inspection of all electrical wiring and components to assure proper connection.
    - 11. Inspection for leaks in the refrigerant circuit. Pressure and temperature check to determine appropriate refrigerant charge.
    - 12. Operational check of the unit to determine working conditions. Repair or adjustment should be made at this time.
  - Warranty Certificate
  - Before you call for service...
  - In Case of Trouble
    - Fig. 10 Monoport Burner
    - Table 2 Maintenance Checklist

Tempstar PDD4 Owner's Manual

Tempstar PDD4 Dual Fuel System manual cover

Pages 10

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Tempstar PDD4 Dual Fuel System Specification

The Tempstar PDD4 Dual Fuel System integrates advanced heating technology, combining the efficiency of an electric heat pump with the robust reliability of a gas furnace. Designed to optimize energy use, the PDD4 system automatically switches between the electric heat pump and the gas furnace based on outdoor temperatures, ensuring optimal comfort and efficiency. The system features a high-efficiency compressor and a variable-speed blower motor, enhancing energy savings and providing consistent temperature control. The heat pump operates with a SEER (Seasonal Energy Efficiency Ratio) rating, ensuring cost-effective performance during mild weather, while the gas furnace, equipped with an AFUE (Annual Fuel Utilization Efficiency) rating, delivers efficient heating during colder conditions. The system includes sophisticated control technology, allowing precise temperature management and seamless integration with smart home systems. It also boasts durable construction with corrosion-resistant housing and components, ensuring longevity and reliability. Additionally, the PDD4 system incorporates advanced filtration technology, improving indoor air quality by removing dust, pollen, and other airborne particles. Designed with user convenience in mind, the system offers quiet operation and easy maintenance, featuring accessible service panels and clearly labeled components. The Tempstar PDD4 Dual Fuel System is engineered to meet rigorous safety and environmental standards, making it an ideal choice for homeowners seeking a versatile and energy-efficient heating solution.

Tempstar PDD4 Dual Fuel System F.A.Q.

How do I properly set the thermostat for my Tempstar PDD4 Dual Fuel System?

To set the thermostat, ensure it is in dual fuel mode. Set your desired temperature and let the system automatically switch between heat pump and gas furnace for optimal efficiency.

What should I do if my Tempstar PDD4 system is not switching between gas and electric?

Check the thermostat settings to ensure it's in dual fuel mode. If the issue persists, inspect the wiring connections and consult the user manual to verify the configuration.

How often should I perform maintenance on the Tempstar PDD4?

Regular maintenance should be done bi-annually. Check air filters monthly and replace them as needed. Schedule professional inspections in spring and fall for optimal performance.

Why is my Tempstar PDD4 system making unusual noises?

Unusual noises may indicate loose components or debris in the unit. Turn off the system and inspect the exterior. If noise persists, contact a technician to examine internal components.

How can I improve the energy efficiency of my Tempstar PDD4 system?

Enhance efficiency by sealing air leaks in your home, using a programmable thermostat, and ensuring regular maintenance of the system, including cleaning the coils and replacing filters.

What are the ideal temperature settings for winter with a Tempstar PDD4 system?

Set your thermostat to 68°F (20°C) during the day and lower it at night to save energy. Adjust settings based on comfort and energy efficiency preferences.

How do I troubleshoot a Tempstar PDD4 system that won't turn on?

Ensure that the thermostat is powered and correctly set. Check circuit breakers and fuses. If the system still doesn't start, a service call may be necessary to diagnose electrical or mechanical issues.

Can I install a Tempstar PDD4 system myself?

Installation of a dual fuel system should be performed by a certified HVAC professional to ensure proper setup, safety, and warranty compliance.

What is the proper way to clean the outdoor unit of the Tempstar PDD4?

Turn off the system and remove debris around the unit. Use a garden hose to gently wash the condenser coils. Avoid high pressure to prevent damage to the fins.

How can I identify if the heat pump or gas furnace is currently operating in my Tempstar PDD4 system?

Listen for the sound of the heat pump outside or check the thermostat's display. Some models indicate the active mode. If uncertain, consult the system's manual or contact support.