4
APP-001b
APR 2007
SUCTION LINE
A ¾” (20 mm) suction line should be connected to a
suction accumulator. See Figure 3. The purger evaporator
shell temperature sensor is factor y set at 40°F (4°C). To
allow for temperature transfer losses between the purger
evaporator and the temperature sensor, the suction
temperature should be approximately 20°F (–7°C) or
below. This then switches the AUTO-PURGER Plus from
its PURGER COOLING DOWN mode to its COLLECTING
AIR AND WATER mode. For higher suction temperatures,
consult the factor y.
WATER BUBBLER FILL LINE
An automatic water bubbler flush system is provided with
the purger. A water line must be connected to the water
bubbler fill line solenoid valve (D). See Figure 4. The
connection is ½” FPT. The water supply pressure should
be 30 – 80 psig (2.1– 5.5 barg).
The clear tube of the water bubbler may become coated
with mineral deposits after a period of time. These deposits
can be removed by adding a cup of vinegar to the water
in the bubbler and cleaning the clear tube through the top
plastic fitting with the supplied brush. A water conditioning
filter housing and car tridge are available for abnormally
hard water.
LOW-PRESSURE PUMPED-LIQUID LINE
A ½” (13 mm) low-pressure pumped-liquid source is
required for the AUTO-PURGER Plus. This connection
should be from the pump discharge of the lowest pressure
recirculator. See Figure 3. This connection should be at a
location where oil will not be directed into the purger. The
low-pressure pumped-liquid line feeds makeup liquid as
required during purging. The line contains liquid ammonia
that typically is also contaminated with water which is to
be removed by the AUTO-PURGER Plus. The liquid line
solenoid valve (B) on the AUTO-PURGER Plus closes when
the AUTO-PURGER Plus is off. See Figure 4.
If the system contains more than one vessel that does not
feed liquid to any other lower pressure vessel, then separate
pipes may need to be installed, with corresponding shut-
off valves, so that liquid can periodically be drawn from
each vessel which may contain water. The liquid pressure
must be a minimum 15 psi (1.0 bar) higher than the APP
suction for the liquid to feed properly.
LOW-PRESSURE LIQUID RETURN LINE
A ½” (13 mm) low-pressure liquid return line is required
for the AUTO-PURGER Plus. Ammonia vapor from the
foul gas line is condensed to liquid in the air separator
chamber. This condensed liquid ammonia flows to the
suction accumulator through the low-pressure liquid
return line. See Figure 3.
AUTO-PURGER PLUS APP PIPING DIAGRAM
Figure 3
TO COMPRESSORS
FROM EVAPORATORS
PUMP
DISCHARGE
LINE
TO SYSTEM
FILL LINE
WATER BUBBLER
DRAIN LINE
WATER BUBBLER
FROM PURGE POINTS
FOUL GAS LINE
LINE
WATER PURGE
VENT LINE
RELIEF VALVE
PUMPED
LIQUID LINE
SUCTION
LINE
LOW PRESSURE
LIQUID RETURN LINE
REFRIGERANT PUMP
OPTIONAL
PIPING
PITCH LINES TOWARD
RECIRCULATOR
AUTO-PURGER
PLUS
SHUT-OFF VALVES
TO SWITCH FROM
MULTIPLE VESSELS
LOWEST PRESSURE
RECIRCULATOR
This drawing is for illustration purposes only
and should not be used for actual engineering
or installation. Not to scale.
