HVAC Excellence Study Guide
_________ may be induced for leak detection with all high pressure refrigerants - ANS-Soap
bubbles
10 lbs. Of refrigerant passing thru a water cooled condenser will lose 20 BTU's of warmth in
keeping with lb. If 10 lbs. Of water passes through the condenser with an entering temperature
of eighty°f. The temperature of the water leaving the condenser is - ANS-one hundred°f
A compound strain gauge measures - ANS-Pressure and vacuum
A compressor unit that has a damaged reed valve will motive these signs - ANS-High suction
stress and occasional discharge strain
A client complains that their air con system is strolling continuously however not cooling
enough. The suction line is very cold and the compressor is sweating. The most in all likelihood
purpose is - ANS-A restrict of the return air or a dirty evaporator
A consumer reviews that their residential break up machine had a compressor replaced final
week by another provider business enterprise. Now the unit isn't cooling well. When you arrive
and look at the unit, you find that the evaporator appears to be starved of refrigerant. On
inspecting the condensing unit, you locate that the liquid line is seating wherein it leaves the
drier. This maximum probably the result of - ANS-Debris from the blistered out compressor has
clogged the drier.
A lower in superheat causes the thermostatic enlargement valve begins to - ANS-Close
A grimy evaporator in a air conditioning machine will purpose those symptoms - ANS-Low
suction pressure and occasional discharge pressure
A drain lure have to be mounted on a split device while the - ANS-Air handler drain is on the bad
aspect
A defective condenser fan motor on a air con gadget will purpose these signs - ANS-High
suction stress and excessive discharge strain
A liquid line filter out drier ought to be located among the - ANS-Condenser and metering device
A liquid receiver is used to - ANS-Store liquid refrigerant
A liquid-to-suction warmness exchanger is frequently used to - ANS-Increase liquid subsoiling
, A low strain reduce off transfer is used to - ANS-Establish minimal running stress within the
evaporator
A low refrigerant fee in a air con system will reason these symptoms - ANS-Low suction strain
and low discharge pressure
A mechanical shaft seal is essential on - ANS-Semi-airtight compressor
A partially clogged capillary tube metering device can reason - ANS-A starved evaporator
A in part froze evaporator can be caused by - ANS-An undercharge
A refrigerant offers up warmness whilst it - ANS-Condenses
A refrigerant overcharge in a capillary tube air con system will motive those signs - ANS-High
suction stress and excessive discharge pressure
A upward push in evaporator stress reasons the automated expansion valve to begin to -
ANS-Open
A scroll compressor moved refrigerant by means of - ANS-Involute spirals
A sight glass would usually be positioned - ANS-In the liquid line, earlier than the metering tool
A technician has located an aircon gadget with a leak in the liquid line. After the line is repaired,
the machine is evacuated and nicely recharged. When the system is began, the compressor is
noisy and walking hot. The most probable reason of noise is - ANS-Low oil inside the machine
A TEV sensing bulb which becomes detached from the suction line will reason these signs and
symptoms - ANS-High suction strain and decrease than everyday discharge pressure
A thermal-electric powered (solid kingdom) growth valve is managed with the aid of - ANS-NTC
Thermistor
A thermostatic enlargement valve is designed to maintain - ANS-Constant evaporator superheat
After a system has been opened and the compressor modified, the carrier technician have to -
ANS-Replace the filter out drier, leak take a look at, evacuate, and fee
Air or other non-condensable gases in a capillary tube air con system will reason these signs -
ANS-High suction pressure and high discharge stress
An accumulator is used to - ANS-Prevent liquid refrigerant from achieving the compressor
_________ may be induced for leak detection with all high pressure refrigerants - ANS-Soap
bubbles
10 lbs. Of refrigerant passing thru a water cooled condenser will lose 20 BTU's of warmth in
keeping with lb. If 10 lbs. Of water passes through the condenser with an entering temperature
of eighty°f. The temperature of the water leaving the condenser is - ANS-one hundred°f
A compound strain gauge measures - ANS-Pressure and vacuum
A compressor unit that has a damaged reed valve will motive these signs - ANS-High suction
stress and occasional discharge strain
A client complains that their air con system is strolling continuously however not cooling
enough. The suction line is very cold and the compressor is sweating. The most in all likelihood
purpose is - ANS-A restrict of the return air or a dirty evaporator
A consumer reviews that their residential break up machine had a compressor replaced final
week by another provider business enterprise. Now the unit isn't cooling well. When you arrive
and look at the unit, you find that the evaporator appears to be starved of refrigerant. On
inspecting the condensing unit, you locate that the liquid line is seating wherein it leaves the
drier. This maximum probably the result of - ANS-Debris from the blistered out compressor has
clogged the drier.
A lower in superheat causes the thermostatic enlargement valve begins to - ANS-Close
A grimy evaporator in a air conditioning machine will purpose those symptoms - ANS-Low
suction pressure and occasional discharge pressure
A drain lure have to be mounted on a split device while the - ANS-Air handler drain is on the bad
aspect
A defective condenser fan motor on a air con gadget will purpose these signs - ANS-High
suction stress and excessive discharge strain
A liquid line filter out drier ought to be located among the - ANS-Condenser and metering device
A liquid receiver is used to - ANS-Store liquid refrigerant
A liquid-to-suction warmness exchanger is frequently used to - ANS-Increase liquid subsoiling
, A low strain reduce off transfer is used to - ANS-Establish minimal running stress within the
evaporator
A low refrigerant fee in a air con system will reason these symptoms - ANS-Low suction strain
and low discharge pressure
A mechanical shaft seal is essential on - ANS-Semi-airtight compressor
A partially clogged capillary tube metering device can reason - ANS-A starved evaporator
A in part froze evaporator can be caused by - ANS-An undercharge
A refrigerant offers up warmness whilst it - ANS-Condenses
A refrigerant overcharge in a capillary tube air con system will motive those signs - ANS-High
suction stress and excessive discharge pressure
A upward push in evaporator stress reasons the automated expansion valve to begin to -
ANS-Open
A scroll compressor moved refrigerant by means of - ANS-Involute spirals
A sight glass would usually be positioned - ANS-In the liquid line, earlier than the metering tool
A technician has located an aircon gadget with a leak in the liquid line. After the line is repaired,
the machine is evacuated and nicely recharged. When the system is began, the compressor is
noisy and walking hot. The most probable reason of noise is - ANS-Low oil inside the machine
A TEV sensing bulb which becomes detached from the suction line will reason these signs and
symptoms - ANS-High suction strain and decrease than everyday discharge pressure
A thermal-electric powered (solid kingdom) growth valve is managed with the aid of - ANS-NTC
Thermistor
A thermostatic enlargement valve is designed to maintain - ANS-Constant evaporator superheat
After a system has been opened and the compressor modified, the carrier technician have to -
ANS-Replace the filter out drier, leak take a look at, evacuate, and fee
Air or other non-condensable gases in a capillary tube air con system will reason these signs -
ANS-High suction pressure and high discharge stress
An accumulator is used to - ANS-Prevent liquid refrigerant from achieving the compressor
