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Qaagi - Book of Why

Causes

Effects

by the Fault analysis(passive) caused bytwo , low suction pressure

as expectedleadsto lower suction side pressure

A clogged liquid linewould resultin a low suction side pressure

A restricted expansion valvewill resultin low suction pressure and no cooling

Closedwill will resultin low suction pressure and no cooling

Many VRUsare designedto shut off on low suction pressure

small air leak(vacuum leakCould ... also causelow vacuum pressure

Low load conditionscan causeexcessively low suction pressure

the conditionsresultingfrom abnormally low suction pressure

Many reasonscan causelow refrigerant suction pressure

by the valve(passive) could be causedHigh suction pressure

low discharge pressureresultingin low suction pressure

the coilcausinghigh suction pressure

Irregularities ... instances of valve failureresultsin uncharacteristically high suction pressure

a drop in coil temperaturecausesa drop in the suction pressure

anything other system problemcauseslow suction pressure

by low refrigerant ... but insufficient heat getting to the evaporator(passive) is ... caused bythe low suction pressure

by the valve not being seated properly(passive) could be caused byHigh suction pressure

by the valve not being seated properly(passive) could be causedHigh suction pressure

the valve not being seated properly(passive) could be caused byHigh suction pressure

Increased compressor 76 speedcausesa lower suction pressure

to drive the correct amount of liquid through the expansion devicecausinga low suction pressure

the coilresultingin lower suction pressure

A low refrigerant levelwill causelow evaporator pressure

A restricted suction linecauseslow suction pressure

resulting the low feed to the evaporatorcausinglow suction pressure

by hot gas defrosting(passive) caused byhigh suction pressure

hot gas defrosting(passive) caused byhigh suction pressure

coil temperaturecausesa drop in the suction pressure

Prime ... other system problemcauseslow suction pressure

by low refrigerant(passive) where ... to be caused bylow suction pressure

by low refrigerant(passive) to be caused bylow suction pressure

low refrigerant(passive) where ... to be caused bylow suction pressure

by low refrigerant(passive) is ... causedthe low suction pressure

by low refrigerant(passive) is ... caused bythe low suction pressure

The system will then be operating with an undersized coilresultingin low suction pressure

The system 100 will then be operating with an undersized coilresultingin low suction pressure

the low chargecauseslow suction pressure

by the lack of load(passive) caused bylow suction pressure

Expansion ValvesCausingLow Suction Pressure

to cavitationcan leadto cavitation

The hazard(passive) caused byThe hazard

to compressor failurecan leadto compressor failure

from a loss of refrigerant chargecould resultfrom a loss of refrigerant charge

to cavitationleadingto cavitation

to compressor failurecan leadto compressor failure

in high actual volume flowsresultsin high actual volume flows

them to turn off to avoid running drycausedthem to turn off to avoid running dry

low return air volume and insufficient cooling capacitycauseslow return air volume and insufficient cooling capacity

Low discharge pressure(passive) may be caused byLow discharge pressure

in overheating of the scrolls and permanent damage to the scroll tipswill resultin overheating of the scrolls and permanent damage to the scroll tips

high head pressurewill ... causehigh head pressure

cavitation and loss of flowcausescavitation and loss of flow

a high compression ratiocausinga high compression ratio

a high compression ratio(passive) is ... caused bya high compression ratio

a high compression ratio(passive) is ... causeda high compression ratio

to higher mass flow ratescontributesto higher mass flow rates

the air lock(passive) caused bythe air lock

This problem(passive) could be caused byThis problem

in a vacuumresultsin a vacuum

bubble formationcausesbubble formation

from a loss of refrigerant chargecould resultfrom a loss of refrigerant charge

in the compressorresultsin the compressor

Cavitation(passive) is caused byCavitation

Cavitation(passive) is caused byCavitation

a loss - of - coolant event(passive) caused bya loss - of - coolant event

all refrigerantcausingall refrigerant

in a lower temperature in the evaporator coilresultsin a lower temperature in the evaporator coil

open protection switch(passive) caused byopen protection switch

by trying to maintain too low an indoor temperature , OR lack of airflow through the inside coilGenerally causedby trying to maintain too low an indoor temperature , OR lack of airflow through the inside coil

in compressor cyclingresultsin compressor cycling

from a secondary plant transientresultingfrom a secondary plant transient

to higher compression ratio and lower volumetric efficiencyleadsto higher compression ratio and lower volumetric efficiency

discharge pressure decreasewill also causedischarge pressure decrease

the refrigerant to flash as soon as it leaves the expansion devicecausesthe refrigerant to flash as soon as it leaves the expansion device

the compressor to run extremely hot with a rise in amps drawnwill causethe compressor to run extremely hot with a rise in amps drawn

aspiration of and/orcould causeaspiration of and/or

The cavitation phenomenon of horizontal multistage centrifugal pump(passive) may be caused byThe cavitation phenomenon of horizontal multistage centrifugal pump

tissue damage and affect normalcan causetissue damage and affect normal

in compress cyclingresultsin compress cycling

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