Chapter 120 Flashcards
How many pressure gauges are usually installed on a refrigeration system?
two, high/low pressure sides of the compressor
The pressure gauges connected close to the compressor should be installed with?
pulsation dampers to prevent flickering
By code its required that when a pressure gauge is installed on the high pressure side the gauge must be graduated:
two times the design working pressure
Oil pressure differential can be found by subtracting the suction pressure from the?
oil pressure on the gauge
What can oil carry over in the condenser result in?
Low heat transfer, high power consumption, high compressor discharge pressure
Where is a oil separator installed on a refrigeration system?
between the compressor and the condenser
Where is a suction strainer installed on a refrigeration system?
in the suction line of the compressor
What can be installed to prevent ice buildup in the expansion valve?
filter-drier
Where is the distributor installed on a refrigeration system?
directly downstream from the expansion valve
Where is the distributor installed on a refrigeration system?
directly downstream from the expansion valve
Where should vibration absorbers be installed?
as close to the compressor as possible
The two most common pressure relief devices for refrigeration systems are:
spring-loaded relief valves and fusible plugs
What kind of pipe joint should be used for high pressure 31.75mm or smaller piping?
screwed
Since ammonia causes corrosion of copper and copper alloys what metal must be used for piping?
steel
Besides moisture what else can a refrigeration sight glass/moisture indicator detect?
restriction in the liquid line
What are refrigeration isolation valves designed to do?
isolate system parts, be easy to operate, prevent the loss of refrigeration
What are refrigeration isolation valves designed to do?
isolate system parts, be easy to operate, prevent the loss of refrigeration
Which location doesnt require a stop valve by code to be installed on a refrigeration system?
suction inlet of each liquid reciever
Discharge of refrigerants cannot be less than _____ from any window, ventilation opening or exit in any building.
7.6 m
