Figure 6-58.The liquid recovery method.
external storage cylinder is not overfilled. Eighty
percent capacity is normal. If the recovery unit is
equipped with a sight-glass indicator, any changes that
may occur should be noted.
performed by most recycling machines reduces the
contaminants through oil separation and filtration.
Normally recycling is accomplished during the
recovery of the vapor or liquid refrigerant by use of
equipment that does both recovery and recycling of
The process of cleaning refrigerant for reuse by oil
Recycling machines use either the single-pass or
separation and single or multiple passes through
multiple-pass method of recycling. The single-pass
filter-driers which reduce moisture, acidity, and matter
method (fig. 6-59) processes refrigerant through a
is called "recycling." In the past, refrigerant was
filter-drier and/or uses distillation. It makes only one
typically vented into the atmosphere. Modern
pass through the recycling process to a storage
technology has developed equipment to enable reuse
cylinder. The multiple-pass method (fig. 6-60)
of old, damaged, or previously used refrigerant.
recirculates refrigerant through the filter-drier many
Refrigerant removed from a system cannot be simply
times, and after a period of time or number of cycles,
reusedit must be clean. Recycling in the field as
the refrigerant is transferred to a storage cylinder.
Figure 6-59.Single-pass method of recycling.