Operating instructions

47
14C. SEALED SYSTEM PROBLEMS
One mechanical problem you may encounter is refrigerant flow
restriction. There are two types of restrictions, high side and
low side. The basics to use to determine a restriction are amp
draw and pressure.
To determine the high side pressure, add 32 degrees to your
ambient temperature. Find that temperature on the chart on
Page 25. The pressure listed to the right of the temperature
should be your correct high side pressure, plus or minus 7
PSIG. For the low side pressure, divide the high side pressure
by four. This will be the low side pressure, plus or minus 3
PSIG.
High side restriction will cause higher than normal ampHigh side restriction will cause higher than normal amp
High side restriction will cause higher than normal ampHigh side restriction will cause higher than normal amp
High side restriction will cause higher than normal amp
draw, drastically higher than normal high side pressures,draw, drastically higher than normal high side pressures,
draw, drastically higher than normal high side pressures,draw, drastically higher than normal high side pressures,
draw, drastically higher than normal high side pressures,
and slightly higher than normal low side pressures.and slightly higher than normal low side pressures.
and slightly higher than normal low side pressures.and slightly higher than normal low side pressures.
and slightly higher than normal low side pressures.
Low side restriction will cause lower than normal ampLow side restriction will cause lower than normal amp
Low side restriction will cause lower than normal ampLow side restriction will cause lower than normal amp
Low side restriction will cause lower than normal amp
draw, drastically lower than normal low side pressuresdraw, drastically lower than normal low side pressures
draw, drastically lower than normal low side pressuresdraw, drastically lower than normal low side pressures
draw, drastically lower than normal low side pressures
and slightly lower than normal high side pressures.and slightly lower than normal high side pressures.
and slightly lower than normal high side pressures.and slightly lower than normal high side pressures.
and slightly lower than normal high side pressures.
A restriction that would not follow these basic conditionsA restriction that would not follow these basic conditions
A restriction that would not follow these basic conditionsA restriction that would not follow these basic conditions
A restriction that would not follow these basic conditions
is a liquid line restriction, which is in the high side of theis a liquid line restriction, which is in the high side of the
is a liquid line restriction, which is in the high side of theis a liquid line restriction, which is in the high side of the
is a liquid line restriction, which is in the high side of the
air conditioner. It will give the same results as a low sideair conditioner. It will give the same results as a low side
air conditioner. It will give the same results as a low sideair conditioner. It will give the same results as a low side
air conditioner. It will give the same results as a low side
restriction.restriction.
restriction.restriction.
restriction.
The most common restriction is the capillary tube or tubes, and/
or at the filter-drier. If there is a restriction in the liquid line, there
will be a temperature drop from one side of the restriction to the
other side.
In the case of a capillary tube restriction, one tube would be
normal (warm to the touch) and the restricted tube would be
cool or cold to the touch, and could even sweat if operated long
enough.
A restriction in the filter-drier would cause a temperature drop
at the point of the restriction. A buildup of frost or sweat could
be evident if operated long enough.
Refrigerant leaks can occur from an improper weld, a broken
line or other damage. Compressor oil will often be noticeable at
the location of major leaks.
Replace any parts that are found to be bad. Whenever a
component is replaced in the sealed system, or the system has
been opened to the atmosphere, a new filter-drier and evacu-
ation is required.