14
APM-001e
AUG 2015
INTRODUCTION
Model APMF AUTO-PURGERs are for use in halocarbon
refrigeration systems. The installation and operation of
these AUTO-PURGERs are similar to that of an ammonia
AUTO-PURGER M.
PIPING HALOCARBON AUTO-PURGERS
The halocarbon liquid line and foul gas line piping and sizing
details are the same as for an ammonia AUTO-PURGER
M. However, the suction line size for halocarbon purgers
should be ¾
”
(20mm) for suction temperatures down to -20ºF
(-29ºC) to -60ºF (-51ºC) suction temperatures. Condenser
drain lines on halocarbon evaporative condensers must
be trapped and drop vertically 8’ - 12’ (2.5m - 3.7m), or
per manufacturer recommendations. This is to prevent
possible backflow of liquid into one or more condenser
circuits resulting in a flooded purge point.
Purge points are at the same locations as for an ammonia
purger. For evaporative condensers, the purge points are
on the top of the outlet drain line. Although noncondensible
gases are lighter than halocarbon gas, they still collect at,
or near, the outlet.
OPTIONAL VALVE PACKAGE, VPMF
The special construction for APMF AUTO-PURGERs includes
a filter-dryer conditioning system for the foul gas and liquid
line. Water vapor, as well as noncondensible gas, may
be present at each purge point. The filter-dryers remove
this moisture before it can enter the purger. Both dryers
are used to protect the purger internally from freezing
water, but they also supplement water removal of the
primary refrigeration system liquid line dryers. Moisture
indicating sight glasses located downstream of the filter-
dryers indicate when the filter-dryer cores are saturated
with water and must be replaced. Isolation shut-off valves
are included for change out of the filter-dryer cores, and
access valves allow evacuation of the refrigerant from the
filter-dryer shell.
AIR INDICATING COLUMN
While the air indicating column (water bubbler flush system)
is included, the water line and drain line are not required.
Fill the clear tube to the marked line with a lightweight,
clear refrigeration oil. Noncondensibles released from the
purger bubble up through the column, indicating proper
operation.
SECTION 5 APMF AUTO-PURGER M FOR HALOCARBON SYSTEMS
OPTIONAL VALVE PACKAGE FOR HALOCARBON SYSTEMS (VPMF)
Figure 14
