troubleshooting refrigeration chapter 29 review questions

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salvatorefricano
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298137
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troubleshooting refrigeration chapter 29 review questions
Updated:
2015-03-10 23:13:15
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trobleshooting
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troubleshooting
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  1. The approach of a cooing tower is the
    difference in temperature between the entering air wet-bulb temperature and the sump water temperature
  2. with the entering air above 70*, the temperature difference between the outdoor air and the condensing temperature on standard units will be
    30*
  3. In a waste water cooled system, the difference between the condensing temperature of the refrigerant and the leaving water temperature is approximately
    10*
  4. in a water cooled condensing unit/cooling tower combination, the temperature difference of the water through the condenser will be approximately
    10*
  5. Medium- temperature refrigerant cabinet temperature range from
    30* - 45*
  6. an air-cooled R-12 refrigerant system is operating normally with a suction pressure of 25 psig and a head pressure of 136 psig. which of the following represents a possible set of operating pressure if the condenser fan motor burns out
    high side 180 psig, low side 35 psig
  7. condensing units located outside that are required to operate year round must have some kind of
    head pressure control
  8. in a waste water system, the water entering the condenser is 85* and the water leaving the condenser is 90*. Which of the following statements is a logical explanation for the above condition
    • water regulating valve stuck in the wide-open position.
    • excess water flow through the condenser
  9. in a high temperature refrigeration unit, the boiling point of the refrigerant in the coil is normally______lower than the cabinet temperature for high humidity %
    8* to 10*
  10. when the compressor in a system using capillary tubes is sweating, it is a sign of _____
    • evap blower motor problem
    • refrigerant overcharge
    • dirty evap
  11. the refrigerant temp of a high temp refrigerant unit ranges from
    45* to 60*
  12. if a air cooled condenser is located on 95* roof and the condenser saturation temp is 150*, which of the following is a possible senerio
    • the system is overcharged
    • the condenser is clogged
  13. in a water system, the water entering the condenser is 85* and the water leaving the condenser is 105*. which of the following statements is a logical explanation for the above conditions
    reduced water flow through the condenser
  14. true or false
    if you have high suction pressure and low condensing pressure on your gauges, you could diagnose the compressor had bad valves or rings
    true
  15. True or False
    the best place for a liquid line sight glass is at the inlet of the expansion device
    true
  16. true or false
    water cooled condenser on a waste water system require about 3.0 gpm per ton af refrigerant
    false
  17. true or false
    if the evaporator and the condenser are starved for refrigerant, the condenser will also be starved
    true
  18. true or false
    dirty condenser coils are usually the cause of inefficient  condensers
    true
  19. true or false
    a txv's job is to raise the pressure of the refrigerant
    false

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