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Troubleshooting a restricted re frig er ant sys tem can be diffi cult.
The following proce dures are the more com mon prob lems and
so lu tions to these problems. There are two types of re frig er ant
restrictions: Par tial re stric tions and com plete restrictions.
A partial restriction al lows some of the re frig er ant to circulate
through the system.
With a complete restriction there is no cir cu la tion of re frig er ant
in the system.
Restricted refrigerant systems dis play the same symp toms as
a "low-charge condition."
When the unit is shut off, the gauges may equal ize very
slowly.
Gauges connected to a completely re stricted sys tem will run
in a deep vacuum. When the unit is shut off, the gaug es will
not equal ize at all.
A quick check for either condition be gins at the evap o ra tor.
With a par tial re stric tion, there may be gur gling sounds at the
me ter ing device en trance to the evap o ra tor. The evap o ra tor
in a partial re stric tion could be par tial ly frosted or have an ice
ball close to the en trance of the me ter ing device. Frost may
con tin ue on the suction line back to the compressor.
Often a partial restriction of any type can be found by feel,
as there is a tem per a ture difference from one side of the
re stric tion to the other.
With a complete restriction, there will be no sound at the
me ter ing de vice en trance. An amperage check of the
com pres sor with a partial restriction may show nor mal cur rent
when com pared to the unit spec i fi ca tion. With a com plete
re stric tion the cur rent drawn may be con sid er ably less than
nor mal, as the com pres sor is running in a deep vacuum (no
load.) Much of the area of the con dens er will be rel a tive ly cool
since most or all of the liquid re frig er ant will be stored there.
The following conditions are based primar ily on a sys tem in
the cooling mode.
Restricted Refrigerant System
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