HVAC Excellence
- ✅✅-An inert gas
10lbs. Of refrigerant passing through a water cooled condenser will lose 20
BTU of heat per lb. if 10lbs. Of water passes through the condenser with an
✅✅
entering temperature of 80'F. The temperature of the water leaving the
condenser is. - -100'F
A compound pressure gauge measures - ✅✅-Pressure and vacuum
✅✅
A compressor that has broken reed valve will cause these symptoms. -
-High suction pressure and low discharge pressure
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. - -low refrigerant charge.
A customer reports that the residential split system had a compressor
replaced last week by another service company now the unit is not cooling
properly when you arrive and inspect the unit you find that the evaporator
seems to be starved of refrigerant. On examining the condensing unit you find
✅✅
that the liquid line is sweating where it leaves the drier this is most likely the
result of. - -Debris from the burned out compressor has clogged the drier
✅✅
A decrease in superheat causes the thermostatic expansion valve begins to. -
-Close
✅✅
A dirty evaporator in an air conditioning system will cause these symptoms -
-Low suction pressure and low discharge pressure
A drain trap should be installed on a split system when the - ✅✅-Air handler
drain is on the negative side
✅✅
A faulty condenser fan motor on an air conditioning system will cause these
symptoms - -High suction pressure and high discharge pressure
, A liquid line filter drier should be placed between the. - ✅✅-Condenser and
metering device
✅✅-Store liquid refrigerant
A liquid receiver is used to. -
A liquid-to-suction heat exchanger is often used to - ✅✅-Increase liquid
subcooling
✅✅
A low pressure cut-off switch is used to. (and is also called loss of charge
switch.) - -Establish a minimum operating pressure in the evaporator.
✅✅
A low refrigerant charge in a air conditioning system will cause these
symptoms - -Low suction pressure and low discharge pressure
A mechanical shaft seal is necessary on a - ✅✅-Open drive compressor /
external force
A partially clogged capillary tube metering device can cause - ✅✅-A starved
evaporator
A partially iced over evaporator can be caused by. - ✅✅-An undercharge
A refrigerant gives up heat when it. - ✅✅-It condenses
✅✅
A refrigerant overcharge in a capillary Tube air conditioning system will cause
the symptoms - -High suction pressure and high discharge pressure
✅✅
A rise in evaporator pressure causes the automatic expansion valve to begin
to. - -Close
A scroll compressor moves refrigerant by means of. - ✅✅-Involute spirals
A sight glass would normally be located. - ✅✅-In the liquid line, before the
metering device.
A technician has found an air conditioning system with a leak in the liquid line
after the line is repaired the system evacuated and properly recharged when
✅✅
the system is started the compressor is noisy and running hot the most
probable cause of the noise is - -Low oil in the system
- ✅✅-An inert gas
10lbs. Of refrigerant passing through a water cooled condenser will lose 20
BTU of heat per lb. if 10lbs. Of water passes through the condenser with an
✅✅
entering temperature of 80'F. The temperature of the water leaving the
condenser is. - -100'F
A compound pressure gauge measures - ✅✅-Pressure and vacuum
✅✅
A compressor that has broken reed valve will cause these symptoms. -
-High suction pressure and low discharge pressure
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. - -low refrigerant charge.
A customer reports that the residential split system had a compressor
replaced last week by another service company now the unit is not cooling
properly when you arrive and inspect the unit you find that the evaporator
seems to be starved of refrigerant. On examining the condensing unit you find
✅✅
that the liquid line is sweating where it leaves the drier this is most likely the
result of. - -Debris from the burned out compressor has clogged the drier
✅✅
A decrease in superheat causes the thermostatic expansion valve begins to. -
-Close
✅✅
A dirty evaporator in an air conditioning system will cause these symptoms -
-Low suction pressure and low discharge pressure
A drain trap should be installed on a split system when the - ✅✅-Air handler
drain is on the negative side
✅✅
A faulty condenser fan motor on an air conditioning system will cause these
symptoms - -High suction pressure and high discharge pressure
, A liquid line filter drier should be placed between the. - ✅✅-Condenser and
metering device
✅✅-Store liquid refrigerant
A liquid receiver is used to. -
A liquid-to-suction heat exchanger is often used to - ✅✅-Increase liquid
subcooling
✅✅
A low pressure cut-off switch is used to. (and is also called loss of charge
switch.) - -Establish a minimum operating pressure in the evaporator.
✅✅
A low refrigerant charge in a air conditioning system will cause these
symptoms - -Low suction pressure and low discharge pressure
A mechanical shaft seal is necessary on a - ✅✅-Open drive compressor /
external force
A partially clogged capillary tube metering device can cause - ✅✅-A starved
evaporator
A partially iced over evaporator can be caused by. - ✅✅-An undercharge
A refrigerant gives up heat when it. - ✅✅-It condenses
✅✅
A refrigerant overcharge in a capillary Tube air conditioning system will cause
the symptoms - -High suction pressure and high discharge pressure
✅✅
A rise in evaporator pressure causes the automatic expansion valve to begin
to. - -Close
A scroll compressor moves refrigerant by means of. - ✅✅-Involute spirals
A sight glass would normally be located. - ✅✅-In the liquid line, before the
metering device.
A technician has found an air conditioning system with a leak in the liquid line
after the line is repaired the system evacuated and properly recharged when
✅✅
the system is started the compressor is noisy and running hot the most
probable cause of the noise is - -Low oil in the system
