Esco Study guides, Class notes & Summaries

NATE Heat Pump Exam with Complete Solutions Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode ️️B: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is the heat pump more efficient? A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode ️️A: Heating mode Which of the following components is exclusiv...

Gas Heat ESCO exam with Complete Solutions 100% Verified A gas furnace to be installed in a garage. The national standards requires that the burners and ignition must be located ____ above the floor: ️️18 inches A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is: ️️Temperature on/ Temperature off Redundant gas valves used on gas furnaces will shut down if gas pressure exceeds: ️️13.5 in W.C. (or 1/2 psi) This is the maximum pres...

HVAC: EPA 608 Certification Study Guide Questions and Answers 100% Solved Are there drop-in replacements for R-12 systems? Why or why not? ️️No because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? ️️Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? ️️Alkylbenzene lubricant What is difference b/w ternary blend a azeotropi...

HVACR gas heating ESCO Questions and Answers 100% Solved using an ohmmeter, there is 120 VAC between high speed and ground wires, this indicates ️️open if temperature rise is too high... ️️increase fan speed how many of the 3 OSHA conditions defining confined spaces must be met ️️all 3 what causes the temperature limit safety switch to shut off the burner ️️fan motor failure flashback indicates ️️the gas is flowing slower than the speed at which burn is occurring wh...

HVAC Air Condition Esco 2024/2025 Questions and Answers 100% Solved Heat which causes a change in temperature of a substance is called ️️Sensible Heat Heat added to a substance without a rise in temperature is called ️️Latent Heat Heat added to refrigerant in a vapor state after the evaporation process is called ️️Superheat A scroll compressor moved refrigerant by means of ️️Involute spirals The movement of heat by way of fluid is called ️️Convection

NATE: Air Conditioning Troubleshooting Test Questions and Answers 100% Solved What are the symptoms of a TXV air conditioning system if it has lost its charge: ️️The superheat will increase and the low-side pressure will decrease A customer who owns a split air conditioning system complains that his system has been running but his house doesn't seem to be cooling properly. When the service technician arrives on the job, he or she finds that the indoor blower is operating and the ...

ESCO Study set- gas furnaces Test Questions and Answers 100% Solved Burning one cubic foot of natural gas will produce approximately _____ BTU's ️️900- 1,100 BTU The National Fuel Gas Code classifies a vent system for a condensing furnace as; ️️Category IV what type of draft is used to move flue gas through the heat exchanger and into the venting system in modern gas-fired furnaces? ️️Mechanical A customer complains that a 2 year- old, direct, hot surface ignition furnac...

ESCO Light Commercial Refrigeration EXAM with Complete Solutions In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: ️️ The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at theevaporator outlet is known as: ️️ An expansion device that is stuck open will cause: ️️ When measuring evaporator superheat on a commercial system that has a long su...

HVAC Unit 31 Gas Heat Questions and Answers 100% Solved Name the four main components of a gas fired heating system. ️️Manifold and controls Burners Heat exchanger Venting system Name the four types of furnace flow patterns. ️️Upflow Low-boy Downflow Horizontal Which type of furnace is usually found in basements that have low headroom? ️️Low-boy What is another name for a downflow furnace? ️️Counterflow Where do you usually find horizontal furnaces? ️️In crawl sp...

Heat Pump ESCO Test Questions and Answers 100% Solved An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an ️️Reversing valve What is the difference between "demand defrost" and "timed defrost"? ️️Demand defrost happens only when needed and timed defrost is based on time/temperature. The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called th...