difference in temperature between the entering air wet-bulb temperature and the sump water temperature
with the entering air above 70*, the temperature difference between the outdoor air and the condensing temperature on standard units will be
30*
In a waste water cooled system, the difference between the condensing temperature of the refrigerant and the leaving water temperature is approximately
10*
in a water cooled condensing unit/cooling tower combination, the temperature difference of the water through the condenser will be approximately
10*
Medium- temperature refrigerant cabinet temperature range from
30* - 45*
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
condensing units located outside that are required to operate year round must have some kind of
head pressure control
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
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*
when the compressor in a system using capillary tubes is sweating, it is a sign of _____
evap blower motor problem
refrigerant overcharge
dirty evap
the refrigerant temp of a high temp refrigerant unit ranges from
45* to 60*
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
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
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
True or False
the best place for a liquid line sight glass is at the inlet of the expansion device
true
true or false
water cooled condenser on a waste water system require about 3.0 gpm per ton af refrigerant
false
true or false
if the evaporator and the condenser are starved for refrigerant, the condenser will also be starved
true
true or false
dirty condenser coils are usually the cause of inefficient condensers
true
true or false
a txv's job is to raise the pressure of the refrigerant
