TPD Exam Answers

1.  Just because s system is running doesn’t mean it’s running right.  Running just means a system is making noise and moving air.  System performance diagnostics enables HVAC systems to operate more efficiently saving homeowners utility dollars.  It provides homeowners with better operating, longer operating HVAC systems. It provides service technicians with more work and employment security.  It provides HVAC contractors with another revenue source.  It’s the right thing for any HVAC professional to do for their clients.

2.  Most HVAC system performance diagnostic methods ignore the basic core concept behind all other HVAC diagnostic methods.  By failing to first look at the HVAC system as a whole, other system performance diagnostic methods take too much time and provide relatively useless information.

3.  Outdoor ambient temperature …. Refrigerant charge …. Indoor CFM

4.  Psychrometrics

5.  HVAC system performance dynamics are based on micro climate conditions like altitude, humidity, heating requirements and electric utility prices. Better reporting can be achieved by customizing these variables to represent local conditions.

6.  Because acceptable system performance exists within a range and is not a static point.  Attempting to repair small variations in maximum system performance is not a wise economic investment for the client.  Thermometers and other performance measuring devices have enough “variance in their tolerance and accuracy” to make exacting precision impossible.

7.  Lap-top computers, personal computers, tablets, and smart phones

8.  Settings …. Report Lookup …. New Reports …. Client Reports

9.  System Information

10.  No

11.  Outdoor ambient temperature

12.  Voltage for both indoor and outdoor units.  Blower motor, condenser fan motor, and compressor amperage.

13.  The CFM Override feature is used to estimate actual system CFM when the TPD cooling report shows a Btu production greater than 100% of nominal capacity.

14.  The Static Pressure field is used for information purposes only to document excessive system static pressures.

15.  Steady State Operation

16.  HVAC system operation begins low and ramps up to optimum system performance over an operating period of 10 to 15 minutes.

17.  Outdoor Ambient Temperature

18.  Return air DB and WB should be taken at the return air grill.  Supply air DB and WB should be taken at the supply vent nearest the air handler.

19.  To eliminate problems associated with variations in calibration between different thermometers.

20.  No

21.  Take the reading again double checking your test instruments and measuring methods.

22.  No

23.  In the center of the exhaust flue within 12 inches of the furnace.

24.  90% + furnaces = inside the combustion air pipe within 12 inches of the furnace.  Use the ambient air conditions in the immediate area of the furnace.

25.  Reduce call backs.  Increase Professionalism.  Improved client service.  Greater job security.

26.  Improved client perception.  Reduce call back expense.  Increased repairs.  Improved bottom line profit.

27.  Better service.  More information for making important repair/replace decisions. Better operating equipment. Lower utility bills.