EPA Type III
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What type of equipment can be worked on with Type III certification?
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low pressure
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The most efficient method of leak checking a charged low-pressure refrigeration unit is to
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pressurize the system by the use of controlled hot water or heater blankets
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When pressurizing a system, do not exceed
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10 psig
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After reaching the required vacuum on an appliance when servicing, moisture is indicated by
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multiple rises in pressure over a period of time with increase of pauses between rises
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EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 1993 is
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25 inches Hg
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EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is
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25 mm Hg absolute
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What can be used to pressurize a chiller system before opening the system for a non-major repair?
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controlled hot water
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Refrigerant recovery from a system using R-11 or R-123 starts with
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liquid removal and is followed by vapor recovery
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If a strong odor is detected during the recovery process,
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a compressor burn-out may have occurred
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When installing more than one, pressure relief valves must be installed
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in parallel
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The owner must keep records of refrigerant added during service and maintenance on equipment
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with charges of 50 lbs. or greater
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After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system
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100 lbs.
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When charging a system with a low pressure refrigerant should be introduced as a vapor to raise saturation temperature to a minim of
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36 degrees
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Where is the purge unit located in a low-pressure system?
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the top of the condenser
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In a chiller, air and other noncondensables collect
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at the top section of the condenser
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A rupture disk for low pressure chiller will rupture at
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15 psig
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The Standard for machine room safety is
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ASHRAE-15
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Who establishes the refrigerant safety group standard
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ASHRAE
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A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge.
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15 percent
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ASHRAE 34 Standard Safety classifies R-134a as
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A1
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Because a low-pressure system operates below atmospheric pressure (in a vacuum),
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leaks in the gaskets or fittings will cause air and moisture to enter the system
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To repair a chiller operating with R-22 the technician
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must have a Type II certification
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What refrigerant has a safety classification of B-1?
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HCFC 123 (R-123)
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During evacuation of systems with large amounts of water, it may be necessary to
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increase pressure by introducing nitrogen to counteract freezing
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When leak testing a low pressure chiller, the maximum pressure to use is
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10 psig
