HVAC EXCELLENCE
10 lbs of refrigerant passing through a water cooled 100 degrees faranheit
condenser will lose 20 BTU of heat/ pound. If 10#'s of water
passes through the condenser with an entering temp of 80
degrees, the temp of the water leaving the condenser is
An accumulator is used to Prevent liquid refrigerant from reaching the compressor
an AC system that is oversized can cause inefficient dehumidification of the conditioned space
After a system has been opened and the compressor replace the filter drier, leak check, evacuate and charge
changed, the service technician must:
air or other non-condensable gasses in a capillary tube AC High suction pressure and high discharge pressure
system will cause
At a residential service call, "no cooling" tech finds unit to An inert gas
be completely out of refrigerant. tech uses a trace amount of
ref. and ___ in order to pressurize the system
Page 1 of 17
,HVAC EXCELLENCE
An automatic expansion valve is best suited: When the system load remains fairly constant
Back seating a two way service valve results in closed service port with normal system flow
before a vapor/ compression system is opened for service the refrigerant must be recovered using approved equipment
Bubbles in the sight glass could be an indication of Low compressor capacity
____ can be used for leak detection with ALL high pressure Soap Bubbles
refrigerants
The Clearance space in a reciprocating compressor has an effect on compressor capacity
Page 2 of 17
, HVAC EXCELLENCE
A Compound pressure gauge measures Pressure and Vacuum
A compressor that has a broken reed valve will cause these high suction pressure and low discharge pressure
symptoms
A customer complains that their AC system is running a restriction of the return air or dirty evaporator
constantly, but not cooling enough. The suction line is very
colde and the compressor is sweating. Mostlikely cause is
A decrease in superheat causes the thermostatic expansion Close
valve to
a dirty evaporator in an AC system will cause these low suction pressure and low discharge pressure.
symptoms
A drain trap should be installed on a split system when the Air handler drain is on the negative side
Page 3 of 17
10 lbs of refrigerant passing through a water cooled 100 degrees faranheit
condenser will lose 20 BTU of heat/ pound. If 10#'s of water
passes through the condenser with an entering temp of 80
degrees, the temp of the water leaving the condenser is
An accumulator is used to Prevent liquid refrigerant from reaching the compressor
an AC system that is oversized can cause inefficient dehumidification of the conditioned space
After a system has been opened and the compressor replace the filter drier, leak check, evacuate and charge
changed, the service technician must:
air or other non-condensable gasses in a capillary tube AC High suction pressure and high discharge pressure
system will cause
At a residential service call, "no cooling" tech finds unit to An inert gas
be completely out of refrigerant. tech uses a trace amount of
ref. and ___ in order to pressurize the system
Page 1 of 17
,HVAC EXCELLENCE
An automatic expansion valve is best suited: When the system load remains fairly constant
Back seating a two way service valve results in closed service port with normal system flow
before a vapor/ compression system is opened for service the refrigerant must be recovered using approved equipment
Bubbles in the sight glass could be an indication of Low compressor capacity
____ can be used for leak detection with ALL high pressure Soap Bubbles
refrigerants
The Clearance space in a reciprocating compressor has an effect on compressor capacity
Page 2 of 17
, HVAC EXCELLENCE
A Compound pressure gauge measures Pressure and Vacuum
A compressor that has a broken reed valve will cause these high suction pressure and low discharge pressure
symptoms
A customer complains that their AC system is running a restriction of the return air or dirty evaporator
constantly, but not cooling enough. The suction line is very
colde and the compressor is sweating. Mostlikely cause is
A decrease in superheat causes the thermostatic expansion Close
valve to
a dirty evaporator in an AC system will cause these low suction pressure and low discharge pressure.
symptoms
A drain trap should be installed on a split system when the Air handler drain is on the negative side
Page 3 of 17
