Study guides, Study notes & Summaries

Heat Pump ESCO Exam Questions with verified Answers 1. 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 --*:correct answers:*--Reversing valve 2. What is the difference between "demand defrost" and "timed defrost"? --*:correct answers:*--Demand defrost happens only when needed and timed defrost is based on time/temperature. 3. The thermostat that controls the auxiliary electric heat according to t...

Refrigeration Excellence AARP 01 Questions and Answers 100% Solved 1. 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: A. Operate at high-efficiency B. Ensure that Frost is not accumulate C. Subcool the compressor D. Ensure proper oil return ️️A. Operate at high-efficiency 2. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator...

Refrigeration ESCO Exam Questions and Answers 100% Solved Heat which is added to a vapor after the change of state occurs is called ️️superheat A refrigerant gives up heat when; ️️it condenses it is desirable for refrigerant in the suction line to be slightly superheated in order to... ️️ensure liquid refrigerant does not enter the compressor state of refrigerant in the suction line should be... ️️low pressure/ low temperature vapor state of refrigerant entering the cond...

Refrigerant 410A Certification Questions and Answers 100% Solved -Suva 410a -AZ-20 -Puron ️️R-410a is also known as? 0.3 ️️The temperature glide for R-410a is less than _____ degrees Fahrenheit over air conditioning and refrigeration operating ranges. -Can be irritating to the skin -Is hydroscopic -Has improved heat transfer characteristics over mineral oils ️️Polyol Ester (POE): 50 psig ️️The low pressure control on R-410a systems will open at: Absolute discharge pr...

Refrigeration 2 ESCO Test Questions and Answers 100% Solved liquid slugging is what ️️liquid refrigerant in the compressor clearance space a customer complains that their air conditioning system is running constantly but not cooling enough. the suction line is very cold and the compressor is sweating. the most likely cause is what ️️a restriction of the return air or a dirty evaporator the clearance space in a reciprocating compressor ️️has no effect on compressor capacity ...

ESCO TEST STUDY GUIDE QUESTIONS AND ANSWERS 100% SOLVED The symbol or letter for impedance is ️️z The NEC and NFPA have designated ____ as ground ️️green Watts formula ️️P = I x E (W = VA) Ohmmeters measure resistance and ___ be used in a live circuit, therefore ____ ️️cannot, must have its own power source Fuses are sized by ️️Volts and Amps Two 120 volt A/C incandescent light bulbs are wired in series; one is a 60 watt bulb and the other is a 4 watt bulb, which ...

HVAC - Residential Air Test Questions and Answers 100% Solved What three environmental conditions have the most effect on comfort? ️️Temperature, humidity, and air movement. Why does the air's relative humidity affect comfort? ️️Relative humidity affects how rapidly perspiration can evaporate. In the heating season, the comfort level can be improved at lower temperatures by: ️️Adding humidity to the air. In the cooling season, the comfort level can be improved at higher ...

HVAC EXCELLENCE TEST 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; (example: liquid refrigerant to gas) this process la called? ️️latent heat Heat added to the refrigerant in vapor state after the evaporation process is called, ️️superheat A scroll compressor moves refrigerant by means of; ️️involute spirals The movement of heat by way of flu...

R410a Test Questions and Answers 100% Solved Recovery cylinders used with R410 must have a DOT rating of... ️️DOT 4BA 400 DOT 4BW 400 When charging an R410a system that uses a thermostatic expansion valve, proper charge can be determined by measuring... ️️Subcooling When charging an R410a system that uses a capillary tube or a fixed metering device, proper charge can be determined by measuring... ️️Superheat Compressor internal pressure relief settings for R410a systems ar...

R410a Test Questions and Answers 100% Solved Recovery cylinders used with R410 must have a DOT rating of... ️️DOT 4BA 400 DOT 4BW 400 When charging an R410a system that uses a thermostatic expansion valve, proper charge can be determined by measuring... ️️Subcooling When charging an R410a system that uses a capillary tube or a fixed metering device, proper charge can be determined by measuring... ️️Superheat Compressor internal pressure relief settings for R410a systems ar...