HVAC Excellence Commercial Air Conditioning ESCO Certification.pdf file:///C:/Users/HP/Desktop/New%20fl/HVAC%20Excellence%20C
HVAC Excellence Commercial Air Conditioning
ESCO Certification
1. Multiple compressor systems have a equalization line to;
A. Maintain equal loads on all compressors
B. Maintain equal oil levels on all compressors.
C. Compensate for different pressures in the compressors.
D. Compensate for evaporator pressure drop.
Answer A. Maintain equal loads on allcompressors
2. The purpose of a double suction line riser is to;
A. maintain minimum refrigerant velocities under varying loads.
B. compensate if one suction filter - drier becomes plugged.
C. prevent low pressure trips on start up.
D. compensate for evaporator pressure drop.
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,HVAC Excellence Commercial Air Conditioning ESCO Certification.pdf file:///C:/Users/HP/Desktop/New%20fl/HVAC%20Excellence%20C
Answer A. maintain minimum refrigerantvelocities under varying loads.
3. To measure superheat, subtract the;
A. low side saturation temperature from the suction line temperature.
B. high side condensing temperature from the suction line temperature.
C. suction line temperature from the ambient temperature.
D. ambient temperature from the suction line temperature
Answer A.low side saturationtemperature from the suction line temperature.
4. An air conditioning system is running constantly, but not cooling enough.The suction
line is very cold and the compressor is sweating. This is an indication of;
A.) low refrigerant charge and needs to be leak tested and repaired.B.) restricted
return air flow or a dirty evaporator
C. restricted air flow across the condenser.
D.) damaged return air duct allowing unconditioned air to be drawn into thesystem.
Answer B.) restricted return air flow or a dirty evaporator
5. Why must a cooling tower or evaporative condenser be blown down period-ically?
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A. The condenser water approach will begin to narrow.
B. Maintain PH level of the circulated water.
C. To refresh cooling tower or condenser with cooler make-up water.
D. To remove concentration of minerals in the water.
Answer D.To remove concentrationof minerals in the water.
6. A customer reports that their system had one of three fan motors replacedlast week by
another service company. Now the unit is not cooling properly since the outdoor
temperature has risen. When you arrive and inspect the unit, you find that discharge
pressure is very high. On further examination, all motors are running, but the amp draw
is different on the new motor as compared to the other two motors.This is most likely the
result of
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A. fan motor is running backward
B. the new motor is grossly over sized.
C. a defective replacement motor.
D., the fan blade was not changed to match the new motor
Answer B. the new motor isgrossly over sized.
7. When pumping down a condensing unit to check the reciprocating com-pressor
valves, the compressor
should be able to achieve;
A. 10" Hg suction with a 300 psig high side pressure.
B. 30" Hg suction when discharging to the atmosphere.
C. 24" Hg suction with a 100 psig high side pressure.
D. 24" psig suction with a 200 psig high side pressure.
Answer B. 30" Hg suction whendischarging to the atmosphere.
8. Direct Digital Control (DCC) is a control process which incorporates a microprocessor,
acting as a digital controller, updates a data-base of internalinformation through;
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