A problem that can look like low refrigerant charge if a service technician is only looking at system pressures is:
A) An overfeeding refrigerant metering device. B) Low evaporator airflow.
C) Low condenser airflow. D) High evaporator airflow.
[Ques. 2] What two readings are needed to calculate the condenser air temperature difference?
A) Air temperature into and water temperature out of the condenser
B) Water temperature into and air temperature out of the condenser
C) Air temperature into and out of the condenser
D) Refrigerant temperature into and out of the condenser
[Ques. 3] Which kind of cooling tower draws or pushes the air across the water, rather than up through it?
A) Induced-draft B) Counterflow C) Forced-draft D) Crossflow
[Ques. 4] Why should a carbon monoxide detector be used in any room where gas-fired space heaters are being used?
A) Because CO is an integral component of natural gas, a CO detector will alarm if there are any small gas leaks in the gas line.
B) High levels of CO can cause nuisance trips of the space heater's oxygen depletion sensor.
C) The efficiency of gas-fired space heaters drops when the CO level in the room exceeds 500 ppm.
D) Gas-fired space heaters can produce carbon monoxide if the space they are operating in does not have adequate combustion air.
[Ques. 5] Where can a technician determine the correct water flow rate for a water-source system?
A) Adjust the water flow until the compressor is operating at its RLA rating point.
B) Look at the manufacturer's specification sheet.
C) Look on the data plate.
D) 4 GPM tons = water flow
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