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25 Cards in this Set
- Front
- Back
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what type of metering device should not be used in a system with a receiver in the liquid line
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Capillary Tube
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The drier desiccant designed to hold moisture by chemical action is
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Absorbent
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Can check Valves can be installed in either vapor ar liquid lines
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yes
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When the compressor service valve is fully front seated; which port is closed off?
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line
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A refrigeration accessory is defined as
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Help but not needed fixture
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What is the porpose of a oil separatoris
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to reduce the amount of oil in the refrigerant cycle
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what is the purpose of a muffler
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to reduce hot gas pulsing
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The main purpose of the liquid suction heat exchanger is to
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subcool liquid refrigerant to prevent flood back
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Filter driers should only be installed in the
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suction or liquid lines
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what should a oil seperator be keeped warm at all times
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to prevent refrigerant vapor condensing to a liquid
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Where should the muffler be installed
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as close to the compressor as possible
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The Accumulator should be installed in the
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Suction line
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can you make a accumulator be made into a heat exchanger
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yes
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what is a crankcase heater used to stop
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migration
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Where is the sight glass located in the
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liquid line
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the heat exchange coils on a heat pump are referred to by their
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lacation in the air stream
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Which two componets are generally found as started on heat pumps, but are considered accessories on an air conditioning unit
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Crankcased heater and suction accumulater
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What causes the reversing (4 way) valve slide to change position?
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pressure differance
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all air to air heat pumps will operate in what three cycles
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cooling -heating-defrost
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the arrow on the accurator metering device must point toward the
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indoor coil
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do you need a heavyduty compressor in heatpumps
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yes
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heat pump refrigerant charge is critical and should be charged by?
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The charging chart or exact weight
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what is the most common combination used in heatpumps into defrost cycle
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outdoor coil temp and timer
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what is another name for a heatpump
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revers cycle A/C system
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the indoor coil fan on a heat pump should be moving an air volume of
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450 CFM
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