Wednesday, 29 January 2014
Lance Waterbarger's Fall Maintenance Secrets - Furnace Burner
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Nashville Interstate AC Service's technician, Lance Waterbarger, reveals three secrets as he completes a fall maintenance check on an 11-year-old York HVAC dual-fuel furnace in the basement of a customer's home. The unit is high efficiency and uses a heat pump and a gas furnace.  This video describes the maintenance checks Lance does on the burners for the gas furnace.  

 

1. Check the burners

Remove the cover from the metal housing around the burners.  There is a hot surface igniter on the left side and a flame sensor on the right side.  Fuel is ignited on the left and the flame will roll down the line towards the right.  If the flame sensor doesn’t sense a flame on the last burner, the burner will shut off and try again.  The flame sensor is one part of the safety equipment on a gas furnace.  Lance checks all the safeties.

2. Check the inducer motor and associated switches

Check the inducer motor and associated switches.  The inducer motor gets the air moving throughout the system, causing a "draft" (positive pressure), so that the combustion gases will travel up the flue.  If the inducer motor does not come on, the furnance will shut down as a safety mechanism.  There is a vacuum hose connected to a pressure switch or fan proofing switch to ensure that there is a draft for the flue.  The pressure switch sends a signal through two wires and tells the circuit board to initiate the heat sequence.  Check that the hose is not clogged up, and that the switch is closing.  Make sure the switch is sending a signal back to the main circuit board.

3. Check the air supply and flue

Be sure the air input pipe is not capped off or plugged up.  It needs to be pulling fresh air into the combustion chamber.  Check that the flue is exhausted to the outside.  If there are any breaks in either of these, or if they are plugged up, this would be a serious safety concern.

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Posted on 01/29/2014 10:14 AM by Eddie Hutton
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Thursday, 16 January 2014
Lance Waterbarger's Fall Maintenance Secrets - Condensate Drainage
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Nashville Interstate AC Service's technician, Lance Waterbarger, reveals two secrets as he completes a fall maintenance check on an 11-year-old York HVAC dual-fuel furnace in the basement of a customer's home. The unit is high efficiency and uses a heat pump and a gas furnace. 

 

1. Check the condensate pump

Water that condenses during the operation of a heat pump or furnace needs to be pumped away, into a drain line.  The higher the efficiency of the unit, the more water will need to be pumped.  Check the pump to make sure it is working.  Make sure you have clean water and a clean reservoir in the pump.  If it is dirty, disassemble it and clean it.  Bacteria and algae can build up and prevent the condensate from draining.

2. Check the condensate drain line

Check to see where the condensate drain line goes.  The drain will freeze up if it goes out a window or is exposed in unprotected space.  If the line freezes, the water cannot drain out and the pump will back up and shut your unit off.  If your furnace quits during freezing weather, pipes in the house could freeze, causing them to burst, resulting in extensive water damage to your home.

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Posted on 01/16/2014 8:00 AM by Eddie Hutton
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Tuesday, 7 January 2014
Lance Waterbarger's Coil Cleaning Secrets
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Nashville Interstate AC Service's technician, Lance Waterbarger, reveals six secrets as he completes a fall maintenance check on an 11-year-old York HVAC unit.  In this video, Lance demonstrates the six steps (listed below) he performed on the outside unit while cleaning the coils.  “If it was easy, everybody would be doing it,” he says!

  1. First, remove the screws holding the fan and fan guard assembly.

  2. Rest the fan guard with fan attached on the side of the unit out of the way so the coils can be reached from the inside. Remove any large debris like twigs and branches that may have gotten in the unit.

  3. Check all the wiring to make sure there aren’t any wires that touch the copper tubes. Make sure that anything that touches copper - like foam insulation or a wire strap – is secured out of the way. Over the life of the unit, the vibration from the unit will cause anything resting or hitting the copper to pop a hole in the copper pipe and cause a leak.

  4. Mix coil cleaner and water in a sprayer.If you’re doing the routine maintenance every six months as you should, you don’t need to make the coil cleaner mixture very strong.

  5. Spray the coil cleaner mixture onto the coils in the inside and wait for it to foam up. Then spray it on the outside of the coils.

  6. Using a garden hose, flush the coils from the inside to the outside with water.

Check out our other maintenance videos (click here) for more fall maintenance tips and secrets.

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Posted on 01/07/2014 2:01 PM by Eddie Hutton
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