Hansen APP08 User manual

Operator Installation
& Instruction Manual
AUTO-PURGER®PLUS, APP
Non-condensible Gas (Air) &
Water Purger for Ammonia
Bulletin APP-001b
APR 2007
Operator Installation & Instruction
Manual for Models APP08, APP16,
APP24 and APPC
AUTO-PURGER®PLUS, APP
SECTION 1 INTRODUCTION
The internal surface area and flooded evaporator efficiency
gives the AUTO-PURGER Plus two to three times the foul
gas condensing capacity of an Armstrong Purger and 10
times the capacity of purgers with small electric hermetic
compressors. In a system with normal noncondensible
loads, all models will handle a 750 ton (2600 kW) ammonia
plant at suction pressures below atmospheric pressure or
a 1500 ton (5300 kW) ammonia plant at positive suction
pressures. The amount of noncondensibles in the system
is based on many factors including age, maintenance
practices, and operating temperature.
The number of purgers required for a system depends on
the number of installed purge points. Twenty-four purge
points is the maximum practical number per purger. For
example, a system with 24 points set to purge for 10
minutes per point requires a 240 minute (4 hour) cycle.
Each purge point can be purged 6 times a day. This may, or
may not, be adequate. Therefore, a second purger should
be used and the purge points divided equally between
the two purgers.
The AUTO-PURGER Plus can operate over a wide range of
condensing pressures. This is important for refrigeration
systems that operate at low condensing pressures during
cold ambient conditions.
The AUTO-PURGER Plus is a totally automatic, electronically-
controlled refrigerant noncondensible gas (air) and
water purger for reducing the energy costs of operating
an ammonia refrigeration system. All models are pre-
assembled, pre-wired, insulated, and include an automatic
water bubbler, a relief valve, and an isolation service valve
package. Installation requires piping the foul gas line, low-
pressure pumped-liquid line, low-pressure liquid return
line, suction line, water bubbler fill and drain lines, relief
valve vent line, water purge line to a customer supplied
container, and power connection, and wiring the remote
purge point solenoid valves. Purge point solenoid valves
must be purchased separately and must be a minimum
of ½” (13 mm) port size.
In addition, a computerized model—APPC—is available
where a separate plant computer or programmable logic
controller (PLC) is used to independently operate the
various remote purge point solenoid valves.
Water contamination in an industrial ammonia refrigeration
system can lower system efficiency, and increase the
electrical costs required to run the system’s refrigeration
compressors. Ammonia refrigerant that is contaminated
with water requires a lower suction pressure to maintain
the same evaporator temperature than would pure
ammonia refrigerant. The requirement to maintain a
lower suction pressure than would be necessary if the
water contamination were removed is a waste of electrical
energy. For water removal, the AUTO-PURGER Plus has
the following capacities:
5% system water concentration – 3 gallons of water
removed per day
10% system water concentration – 5 gallons of water
removed per day
20% or more system water concentration – 7 gallons of
water removed per day.

2
APP-001b
APR 2007
MOUNTING INSTRUCTIONS
Mount the AUTO-PURGER Plus securely on a wall or
sturdy steel channels capable of supporting 450 lbs (205
Kg). Eight mounting holes in the frame are provided to
support the unit. See Figure 1. The unit should be located
in an accessible area, but away from moving equipment
that could accidentally come in contact with the purger.
Elevation with respect to condensers or high-pressure
receivers is not critical. Do not punch access holes in the
top of the control cabinet. Unused electrical entrances
to the enclosure must be sealed to protect the controls
from moisture.
The AUTO-PURGER Plus is normally installed in the
compressor room where it can be monitored, but also may
be installed outdoors where temperatures below freezing
are not anticipated. Outdoor use in areas near falling or
spraying water, or in constant high humidity areas is not
recommended.
Install the float switch assembly on the purger by removing
the packaging material and metal shipping tube. Slip the
float switch assembly over the enclosing tube being sure
the float switch assembly bottoms on the neck on the
enclosing tube. Warning: Tighten the retaining screw such
that the screw tip is in the groove of the neck assembly.
If the float switch assembly is not properly positioned
and retained, the switch may not function.
FOUL GAS PIPING
It is nearly impossible to predict where noncondensible
gases (air) will accumulate. Therefore, purging at several
points on the high-pressure side of the system is the best
method for removing air from the system.
For multipoint purgers, the solenoid valves may be
manifolded into one line to the purger. However, only one
purge point should be purged at a time. Connecting two
purge points together may result in gas flowing from one
condenser to another due to unequal pressure drop, even
though the difference in pressure drops is very small,
for example ¼ psi (0.02 bar). The result is that even in
the best of circumstances, only one point is effectively
purged. The best practice is to purge each condenser
and receiver circuit separately.
It is extremely important to install purge points at locations
sure to be liquid free. Also, no liquid traps are desirable
either before or after purge point solenoid valves. See
Figure 2. The line from the purge point on the condenser
to the AUTO-PURGER Plus should not pass through cold
areas where further condensing of the saturated gas can
occur. If this cannot be avoided, the purge line must be
insulated because flooded purge point lines will flood the
AUTO-PURGER Plus with liquid, resulting in a temporary
halt of noncondensibles being removed.
AUTO-PURGER PLUS APP INSTALLATION DIMENSIONS
Figure 1
SECTION 2 INSTALLATION
LOW PRESSURE SEPARATOR
OIL DRAIN CONNECTION (1/4" FPT)
21.50"
[546 MM]
5.75"
[146 MM]
HIGH PRESSURE SEPARATOR
OIL DRAIN CONNECTION (1/4" FPT)
1" PVC OR 1" FPT WATER BUBBLER
DRAIN CONNECTION.
DO NOT INSTALL SHUT-OFF VALVE
IN WATER BUBBLER DRAIN LINE.
DO NOT RUN LINE MORE
THAN 10' (3 M) ABOVE BUBBLER.
WALL OR
COLUMN
.63"
[16 MM]
OUTLET
.75" [19 MM] CONDUIT KNOCKOUT
FOR REMOTE PURGE
POINT SOLENOID VALVE
CONNECTIONS
.50" [12 MM] CONDUIT KNOCKOUT
FOR POWER CONNECTION
.53" [14 MM] MOUNTING
HOLE (TYPICAL)
4.50"
[114 MM]
31.50"
[800 MM]
7.50"
[191 MM]
16.50"
[419 MM]
1/2" WATER LINE
12.00"
[305 MM]
3.62"
[92 MM]
8.94"
[227 MM]
1/4" FPT GAUGE VALVE
FLANGE UNION
1/2" FPT WATER
BUBBLER FILL LINE
CONNECTION
25.00"
[635 MM]
21.25"
[540 MM]
16.25"
[413 MM]
ACCESS HOLES IN THE TOP
DO NOT PUNCH ELECTRICAL
1" FPT SUCTION LINE CONNECTION
TO PROTECTED SUCTION ACCUMULATOR
SHUT-OFF VALVE
1/2" FPT FOUL GAS LINE CONNECTION FROM PURGE POINTS
ON HIGH PRESSURE CONDENSERS AND RECEIVERS
1/2" FPT LOW-PRESSURE PUMPED-LIQUID LINE CONNECTION
1/4" FPT GAUGE VALVE
1/2" STRAINER
FLOW REGULATOR
1/2" STRAINER
SHUT-OFF VALVE
1/4" FPT GAUGE VALVE
BUBBLER
2.50" [64 MM]
1.00"
[25 MM]
TYPICAL
1.50"
[38 MM]
4.19"
[106 MM]
12.00"
[305 MM]
8.62"
[219 MM]
1/2" FPT LOW-PRESSURE LIQUID-RETURN LINE CONNECTION
10.00"
[254 MM]
1/4" MPT CONNECTION
FOR WATER PURGE LINE
35.00"
[889 MM]
RELIEF VALVE
3/4" FPT
11.00"
[279 MM]
TO CUSTOMER SUPPLIED CONTAINER
CONTROL CABINET
SHUT-OFF VALVE
WATER PURGE LINE
SHUT-OFF VALVE
1/2" STRAINER

3APP-001b
APR 2007
The minimum line size for foul gas piping is ½” (13 mm).
The line should be pitched down toward the purger to
drain any refrigerant that may condense.
It is important that one purge point solenoid valve is
open at all times to prevent losing foul gas pressure to
the purger. The high side pressure transducer monitors
foul gas pressure and the AUTO-PURGER Plus will enter
an alarm condition if foul gas pressure is lost.
EVAPORATIVE CONDENSER PIPING
Typically, ammonia evaporative condenser outlet liquid
drain lines on each circuit must drop between 4’–6’ (1.2m–
1.8m) from the centerline of the condenser outlet to the
centerline of highest elevation of the liquid line manifold
to receiver. Preferably each circuit should have a P-trap
to balance variations in pressure drop in each circuit
and to prevent liquid from backing up into one or more
condensers, flooding the purge point. A properly-sized
equalizer line from the receiver will help drain condenser
circuits into the receiver. Refer to ASHRAE guidelines or
IIAR papers on condenser piping design. Also, consult
condenser manufacturer’s installation instructions for
additional piping and sizing information.
Do not use one purge point solenoid valve to purge two
circuits. This negates the P-trap on the condenser drain
line and may back liquid up into one circuit.
PURGE POINT LOCATIONS
Condensers should be purged at points recommended by
the condenser manufacturer. This is typically at the top
of each circuit’s outlet header.
In some cases a small, high-pressure auxiliary receiver
is located at the outlet of one or more condensers. This
receiver should have a purge point at the top.
Where a high-pressure float regulator is used to drain one
or more condensers, the top of the float valve chamber
should be a purge point.
Heat exchangers and horizontal shell and tube water-
cooled condensers should be purged at the top, usually at
the point or points furthest from the compressor discharge
main inlet. Vertical condensers should be purged near the
top of the vessel if possible.
For certain types of oil separators where very low velocities
may exist near the top of the vessel, purging may be
advisable from a top fitting.
It is not necessary to purge control pressure receivers,
high pressure thermosyphon vessels, or vessels located
on the low side of the system.
CONDENSER CONDENSER CONDENSER
RECEIVER
AUTO-PURGER PLUS APP (ALL MODELS)
PURGE POINT SOLENOID
VALVE (TYPICAL)
LIQUID DRAIN LINE FROM CONDENSER
PITCH FOUL GAS LINES TOWARD PURGER
1/2" (13 MM) LINE SIZE UP TO 200–300 FEET (60–90 M)
3/4" (20 MM) LINE SIZE FOR LONG PURGE GAS LINES
OR WHERE TWO PURGERS ARE PURGING A
COMMON PURGE POINT
1/2" (13 MM) PORT
PURGE POINT
SOLENOID (TYPICAL)
(NO TRAPS ALLOWED)
CONDENSER
INLET (TYPICAL)
PURGE POINT CONNECTION ON
TOP OF OUTLET PIPE OF EACH
CIRCUIT IN CONDENSER (TYPICAL)
PURGE POINT SOLENOID VALVE
(TYPICAL). LOCATE SOLENOID
VALVE NEAR THE PURGE POINT
AT THE SAME OR HIGHER
CONDENSER OUTLET (TYPICAL)
FOUL GAS LINE TO PURGER
1/2" (13 MM) LOW-PRESSURE PUMPED-LIQUID LINE
3/4" (20 MM) MINIMUM SUCTION LINE TO
PROTECTED SUCTION ACCUMULATOR
ELEVATION THAN THAT
OF THE PURGE POINT
1/2" (13 MM) LOW-PRESSURE LIQUID-RETURN LINE
TYPICAL PURGE POINT LOCATIONS
Figure 2

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 factory 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 factory.
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 cartridge 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.

5APP-001b
APR 2007
WATER BUBBLER DRAIN LINE
A 1” (25 mm) PVC socket/1” FPT water drain connection
is located at the bottom of the bubbler. The water bubbler
drain line should flow to a suitable drain or container. See
Figure 4. If the drain line is run overhead, the fitting on the
top of the water bubbler must be sealed, including the ¼”
NPT vent connection in the fitting, and a protective mesh
installed around the clear tube. Do not run the line more
than 10’ (3 m) above the height of the bubbler because the
pressure on the water bubbler could be excessive. Support
the drain line to prevent undue stress on the water bubbler.
Also, do not install a shutoff valve in this line.
Initially, fill the water bubbler with water through the 3”
(80 mm) plug located on top of the tube. Keep the plug
lubricated and hand tight. Check for leaks at the hose
fittings.
WATER PURGE LINE
Water removed from the refrigeration system by the
AUTO-PURGER Plus flows out the water purge line. This
line should be directed to a customer supplied container,
such as a 55 gallon drum for example. See Figure 4. It is
recommended to use rigid metal tubing or to secure the
line. Commonly, when draining water initially all the water
is released, then any oil is released, and then a small
quantity of ammonia vapor may be released. A loose hose
may whip around when the last of the liquid slugs come
out of the hose and is therefore not recommended. The
customer supplied container may be partially filled with
water, and the end of the water purge line submerged in
this water so that any small amount of ammonia vapor
that may be released is dissolved in this water.
OIL DRAINS
Excess oil can reduce the purger capacity by lowering
the evaporating or condensing rate. Oil is not typically a
problem. Oil in the evaporator chamber is typically released
with the water that is released out the water purge line.
However, any oil that may collect in the purger can be
drained off through the two capped ¼” valves on the purger.
See Figure 1. Before draining oil, close the foul gas and
low-pressure pumped-liquid valves. Allow the purger to
pump out, then close the low-pressure liquid return and
suction line valves. Use normal oil draining precautions
to prevent injury or property damage.
ELECTRICAL CONNECTIONS
The standard AUTO-PURGER Plus requires a 115V 50/60Hz
17 amp electrical supply on a 20 amp circuit breaker;
models for 220V 50/60Hz, 11 amps electrical supply on
a 15 amp circuit breaker are available. All models have a
½” (13 mm) knockout on the side of the control cabinet to
access the power connection terminal strip. Any unused
knockout holes must be sealed to prevent splashing water,
dust, and debris from entering the control cabinet. After
completing all electrical connections inside the cabinet,
connect the cable from the PLC Control Console to the
PLC. Connect the cable plug to the socket and tighten the
hand screws. Refer to the wiring tag inside unit.
AUTO-PURGER Plus models APP08, APP16, and APP24
have an additional ¾” (20 mm) knockout for individual
purge point solenoid valves. Wires from each purge point
solenoid valve should be brought to the purger control
cabinet. Any additional access holes should be made on
the side of the control cabinet. All access holes into the
control cabinet must be sealed to prevent moisture, dust,
and debris entering the cabinet.
From each purge point solenoid, one wire is connected
to the corresponding screw terminal for the purge point
inside the control cabinet on the terminal strip. For 115VAC
models, the other wire from the purge point solenoid is
connected together for all the purge points and tied to the
available neutral position on the top terminal strip. For
the 220VAC models, the other wire from the purge point
solenoid is connected together for all the purge points
and tied to the top terminal strip labeled PP_COM.
Models APP08, APP16, and APP24 supply 115VAC to the
purge points regardless of whether 115VAC or 220VAC is
supplied to the control cabinet.
All APP models have a relay available which energizes
whenever action is required by plant personnel. The
normally open contacts will close when action is required.
If desired, the contacts may be connected to a light, an
audible alarm, or to a plant computer, to notify plant
personnel to attend to the purger. The contacts are rated
for 10 amps. Connection to the relay is made at the top
terminal strip labeled REMOTE RELAY.
LEAK TEST
Use standard refrigeration procedures to check the
AUTO-PURGER Plus for leaks before placing it in service.
To confirm a leak-free AUTO-PURGER Plus, manually
open one remote purge point solenoid valve, if there is
one. Manually open the foul gas shut-off valve and allow
pressure inside the purger to build to condensing pressure,
as shown on the high side pressure gauge. Then, manually
open the high side to low side bypass valve to pressurize
the evaporator section of the purger, as shown on the low
side pressure gauge. See Figure 4. Check for leaks. Close
the high side to low side bypass valve.

6
APP-001b
APR 2007
the liquid level gradually falls, causing the float ball to
fall. This changes the SPDT switch position of the liquid
level float switch and energizes the purge gas solenoid
valve (C) and the water bubbler fill line solenoid valve (D),
allowing noncondensible gas to bleed through the orifice
plate into the water bubbler. As air is released into the
water bubbler, the liquid refrigerant level in the purger
float ball chamber rises.
The control software operates each specified remote
purge point solenoid valve in sequence.
The make-up liquid from the low-pressure pumped
liquid line typically contains a small percentage of water
dissolved in the liquid ammonia. This is the water the
AUTO-PURGER Plus will remove from the refrigeration
system. Liquid ammonia and water are brought into the
evaporator chamber of the purger, but only ammonia
vapor can exit through the suction line. Gradually
the concentration of water in the evaporator chamber
increases with time. When the concentration of water in
the evaporator chamber reaches about 25% water / 75%
ammonia, as detected by the water concentration sensor,
the AUTO-PURGER Plus switches to the CONCENTRATING
WATER mode. The purger stops collecting air, isolates
the mixture of water and ammonia, and energizes the two
electric heaters. About half the energy to concentrate
the water comes from the two electric heaters, and the
other half comes from the foul gas that continues to flow
through the purger. The heaters remain energized until the
ammonia water solution is heated to 185°F (85°C), except
for suction pressures in a vacuum. This corresponds to a
concentration of about 10% to 20% ammonia and about
80% to 90% water. In a vacuum, water boils at lower
temperatures, so the set point to which the ammonia
water solution is heated is reduced to an appropriately
lower temperature depending on the suction pressure as
detected by the low side pressure transducer.
The AUTO-PURGER Plus will prepare the concentrated
water for draining, but the computer software will not
allow draining until an operator presses a button to permit
draining. The suction line solenoid valve (E) shuts. The
Control Console indicates READY TO DRAIN. OPEN WATER
PURGE SHUT-OFF VALVE THEN PRESS “OK” BUTTON.
The system remains in this condition until an operator
opens the water purge line shut-off valve and presses the
OK button on the Control Console. See Figure 5.
SECTION 3 AUTO-PURGER PLUS OPERATION
The AUTO-PURGER Plus is designed to automatically start-
up and operate without the assistance of plant personnel.
Beginning at start-up, the following is a description of
the refrigerant flow through a purger when all connecting
shut-off valves are open. See Figure 4.
START-UP
Make sure all piping, electrical connections, and settings
are complete as described in this bulletin. Open the foul
gas, low-pressure pumped-liquid, low-pressure liquid
return, and suction line shut-off valves. Open the purge
gas valve. The water purge line shut-off valve should
remain closed at this time (open only while draining
water). On start-up, the AUTO-PURGER Plus enters a
COOLING DOWN stage. (The display indicates 3333.) In
this stage, liquid refrigerant fills and cools the purger.
The low-pressure pumped-liquid line solenoid valve (B)
energizes to feed refrigerant to the low-pressure flooded
evaporator. The liquid make-up level sensor, located in the
evaporator chamber, senses when the flooded evaporator
is full and closes the low-pressure pumped-liquid line
solenoid valve (B).
At the same time the flooded evaporator is cooling, the
control software energizes the first purge point solenoid
valve. Foul gas enters the high-pressure air separator
chamber and condenses to fill the high-pressure air
separator chamber with liquid. When the float switch
chamber fills with liquid refrigerant, the float ball rises
and pulls in the float switch magnet.
At approximately 20°F (–7°C) evaporator temperature,
the evaporator shell temperature sensor switches the
purger from the COOLING DOWN stage to STARTUP
DELAY MODE for 10 minutes, as indicated by the Control
Console no longer displaying 3333. The control software
will not allow any noncondensibles into the water bubbler
until 10 minutes after the Control Console discontinues
indicating 3333.
OPERATION
When the purger is in COLLECTING AIR AND WATER mode,
a mixture of noncondensible gas and refrigerant flows
into the purger. The evaporator shell temperature sensor
also allows solenoid valves (C) and (D) to open when the
float ball is down (magnet away from tube).
The foul gas may carry a certain amount of condensed
refrigerant, which is captured by the liquid drainer before
it enters the purger’s condenser coil. From the liquid
drainer, the liquid is fed directly into the low-pressure
liquid return line. If this separation does not occur, liquid
refrigerant will fill the purger’s condenser and limit the
condensing capacity of the purger.
The liquid-free foul gas enters the purger condensing
coil, which is submerged in the flooded evaporator. The
refrigerant condenses inside the coil. The condensed
refrigerant and noncondensible gas then flow through a
check valve and back into the air separator chamber. The
condensed liquid refrigerant is removed from the high-
pressure air separator chamber through the liquid metering
valve and to the low-pressure liquid return line.
Meanwhile, the noncondensible gas travels along the top of
the air separator chamber and into the float ball chamber
where it collects. As more noncondensible gases collect,

7APP-001b
APR 2007
AUTO-PURGER PLUS APP FLOW DIAGRAM
Figure 4
After the operator opens the water purge line shut-off valve
and presses the OK button, the water purge line solenoid
valve (G) energizes to drain the concentrated water. If the
pressure in the evaporator chamber is less than 10 psig
(0.7 bar) as detected by the low side pressure transducer,
the low-side pressure assist solenoid valve (F) modulates
to maintain 10 psig (0.7 bar) in the evaporator chamber.
The concentrated water continues to drain until the level
reaches the low-liquid level sensor. After the liquid level
reaches this sensor, the water purge line solenoid valve
(G) remains energized for an additional 10 seconds, and
then shuts.
After the water is drained, the low-side pressure-assist
solenoid valve F closes, the suction line solenoid valve
E opens, and the Control Console indicates, DRAINING
IS COMPLETE. CLOSE WATER PURGE SHUT-OFF VALVE
THEN PRESS “OK” BUTTON.
After the operator closes the water purge line shut-off
valve and presses the OK button, the AUTO-PURGER
Plus goes back to COOLING DOWN mode, STARTUP
DELAY mode, and then COLLECTING AIR AND WATER
mode. If no air or water is present, there are no releases
to atmosphere.
1" WATER BUBBLER
WATER
BUBBLER
OVERFLOW
TUBE
½" FOUL
GAS LINE
½" LOW-PRESSURE
PUMPED-LIQUID LINE ¾" SUCTION LINE
FILL LINE
D
B
C
FLOW REGULATOR
GAUGE VALVE
GAUGE VALVE
LIQUID MAKE-UP
LEVEL SENSOR
CHECK VALVE
LIQUID
DRAINER
OIL DRAIN AND PUMP OUT
HIGH PRESSURE
EVAPORATOR SHELL
FLOAT
SWITCH
1 PSID (0.07 BAR)
CHECK VALVE
½" LOW-PRESSURE
LIQUID RETURN LINE
STOP/CHECK VALVE
METERING
VALVE
HIGH SIDE PRESSURE TRANSDUCER
LEVEL SENSOR
LOW LIQUID
WATER CONCENTRATION SENSOR
ELECTRIC HEATERS
VAPOR
TRAP
TEMPERATURE SENSOR
PLATE HEATER TEMPERATURE SENSOR
LIQUID TEMPERATURE SENSOR
225 PSID (15.5 BAR) RELIEF CHECK VALVE
LOW SIDE PRESSURE TRANSDUCER
STRAINER
E
F
G
1 PSID (0.07 BAR) CHECK VALVE
AIR SEPARATOR
N.C.
OIL DRAIN AND PUMP OUT
FLOODED EVAPORATOR CHAMBER
1 PSID (0.07 BAR) RELIEF CHECK VALVE
WATER PURGE LINE
TO CUSTOMER SUPPLIED CONTAINER
GAS
RELIEF VALVE
300 PSI (20.7 BAR)
½" WATER BUBBLER
DRAIN LINE TO SEWER
RELIEF VALVE
VENT LINE
ASSEMBLY
CHAMBER
HIGH SIDE TO LOW SIDE
BYPASS VALVE
(NORMALLY CLOSED)
WITH ORIFICE
PURGE
VALVE
WATER PURGE LINE
SHUT-OFF VALVE
NO ORIFICE
WATER PURGE LINE STRAINER
NO ORIFICE
SOLENOID VALVES:
B LOW-PRESSURE PUMPED-LIQUID SOLENOID VALVE
C PURGE GAS SOLENOID VALVE
D WATER BUBBLER FILL LINE SOLENOID VALVE
E SUCTION LINE SOLENOID VALVE
F LOW-SIDE PRESSURE-ASSIST SOLENOID VALVE
G WATER PURGE LINE SOLENOID VALVE

8
APP-001b
APR 2007
SECTION 4 CONTROL CONSOLE OPERATION
CONTROL CONSOLE
The Control Console allows the operator to interface with
the purger’s control software. Messages are displayed
in the Control Console Display Window. See Figure 5.
The Control Console Display Window supports four lines
of twenty characters each. Two types of messages can
be displayed by the Control Console Display Window.
The first type of message alerts the operator to specific
important conditions or status. The PLC Message LED
illuminates when one of these messages from the PLC is
being displayed by the Control Console. Pushbuttons are
disabled for 3 seconds after a message is displayed to
ensure that the operator sees the message. The second
type of message consists of the normal Control Console
menu hierarchy, which allows the operator to verify, and
in certain cases change, various system parameters. The
operator can switch between the two message types by
pressing the “esc” key.
Control Console Specifications:
Display Type: Character LCD, 4 lines by 20 characters
w/LED backlight.
Enclosure: NEMA 4, 4x(indoor)
Humidity: 10-95% (non-condensing)
LED/LCD Life: 100,000 hours
The four Control Pushbuttons allow navigation through
the menu hierarchy. See Figure 5.
ESC – Switches between PLC messages and the Control
Console menu system. It is also used to exit when
navigating through the menu system.
/\ – Navigate UP.
\/ – Navigate DOWN.
ENTER – To enter a specific menu hierarchy or enter a
parameter change.
The five Functional Pushbuttons perform specific tasks
when depressed. Each has an LED above it which
illuminates when the button is operational. See Figure
5.
esc
enter
DISPLAY WINDOW
PLC MESSAGE LED
CONTROL
PUSHBUTTONS
PURGE POINT ADVANCE
FUNCTIONAL PUSHBUTTON
(NOT APPLICABLE TO MODEL APPC)
WATER PURGE "OK" FUNCTIONAL PUSHBUTTON
RESET 4444 FUNCTIONAL PUSHBUTTON
SYSTEM RESET FUNCTIONAL PUSHBUTTON
STATUS FUNCTIONAL PUSHBUTTON
AUTO-PURGER PLUS CONTROL CONSOLE
Figure 5

9APP-001b
APR 2007
SYSTEM RESET – Resets the system to its pre-startup
settings. Actions performed by pressing this key consist of
clearing any error code(s), clearing air purge log minutes,
clearing air purge log cycles, clearing water drain log
minutes, clearing water drain cycles, stopping air and
water purging processes if active. The number of purge
points, the 60 MINUTE AIR PURGE LIMIT setting, and the
DISPLAY UNITS will not be changed.
STATUS – Pressing this key once displays the total
time that air has been released in minutes, the number
of cycles that air has been released, the total time that
water has been released in minutes, and the number of
cycles that water has been released. Pressing this key
again displays the water concentration in the purger
evaporator (except the water concentration is not displayed
during CONCENTRATING WATER mode, because the
concentration in this mode often exceeds the range of
the water concentration sensor). Pressing the key again
displays the temperature of the evaporator shell, the
temperature of the liquid inside the purger evaporator,
and the temperature of the plate heaters (see figure 4).
Another press of this key displays the pressures in the
low side and the high side of the purger. A final press of
this key returns the display to its normal messages. If
this key is not pressed a sufficient number of times to
return to the normal messages, it will automatically return
to the normal messages after 2 minutes.
RESET 4444 – Resets a 4444 alarm condition. See Section
7, Troubleshooting for an explanation of this alarm.
OK – This key will become active and its LED will illuminate
when the purger is ready to drain water to the customer
supplied container. The display window will also indicate
READY TO DRAIN. OPEN WATER PURGE SHUT-OFF VALVE
THEN PRESS “OK” BUTTON. When the operator opens the
water purge line shut-off valve and presses this key, the
purger will drain the accumulated water. When draining
is complete, the display window will indicate DRAINING
IS COMPLETE. CLOSE WATER PURGE SHUT-OFF VALVE
THEN PRESS “OK” BUTTON. When the operator closes
the water purge line shut-off valve and presses this key,
the LED will turn off and the purger will return to its normal
mode of collecting air and water.
PURGE POINT ADV. – Press this key to manually advance
to the next purge point. (This key is not applicable to
model APPC.)

10
APP-001b
APR 2007
CONCENTRATING WATER mode. This information is
available for information only, and no action is required
by the operator related to the counts. The drain mode is
always set to 0, and can not be changed.
To change the display units, move the cursor with the /\
and \/ keys to the units: # line and press enter. Change
the value with the /\ or \/ keys, and press enter again.
Press esc to return to the menu.
The version menu item displays the software revisions
for the purger’s display keypad and for the purger’s plc.
PLC MESSAGES
“Active Purge Point ##” where ## indicates the active
purge point.
For 115VAC models, “Liquid Temp: ### ºF” will appear
during the CONCENTRATING WATER process.
For 220VAC models, “Liquid Temp: ### ºC” will appear
during the CONCENTRATING WATER process.
“READY TO DRAIN. OPEN WATER PURGE SHUT-OFF
VALVE THEN PRESS “OK” BUTTON.” will appear when the
process of CONCENTRATING WATER is complete and it
is ready to be drained.
“DRAINING IS COMPLETE. CLOSE WATER PURGE SHUT-
OFF VALVE THEN PRESS “OK” BUTTON.” will appear when
the APP is done draining and is ready to go back to its
normal mode of COLLECTING AIR/WATER.
“Releasing Air” will appear when the APP is releasing
air.
“Concentrating Water” will appear during the process of
heating the ammonia/water solution.
CONTROL CONSOLE MENU HIERARCHY
The control console menu is as follows:
+air purge limit
60 minute limit: #
(normal=0, 60 min)
(startup=1, nolimit)
+purge point enable
01:# 1=enable,0=skip
02:# 1=enable,0=skip
03:# 1=enable,0=skip
04:# 1=enable,0=skip
05:# 1=enable,0=skip
06:# 1=enable,0=skip
07:# 1=enable,0=skip
08:# 1=enable,0=skip
Model APP08 has purge points 01-08 as shown here,
model APP16 has purge points 01-16, model APP24 has
purge points 01-24. Model APPC does not have this
menu item.
+water collection
counts= # (600)
drain mode: 0
+display units
units: #
(1=US)
(0=SI/metric)
+version
keypad FW= ####
plc FW= ####
To change the air purge limit, move the cursor with the /\
and \/ keys to the 60 minute limit: # line and press enter.
Change the value with the /\ or \/ keys, and press enter
again. Press esc to return to the menu.
To enable or disable individual purge points, move the
cursor with the /\ and \/ keys to the desired purge point
and press enter. Change the value with the /\ or \/ keys,
and press enter again. Press esc to return to the menu.
At system start-up, when a purger is initially installed in
a system that has fewer purge points than are available
on the purger (e.g., an APP08 used on system that has 5
purge points), the unused purge points must be set to 0.
The water collection parameters can not be changed and
are for information only. The counts indicate the time
in seconds that the water concentration as measured
by the water concentration sensor exceeds the
concentration set point. The concentration of water in
the purger evaporator must exceed 25% for 10 minutes
(600 seconds) continuously before the purge will enter

11 APP-001b
APR 2007
“Draining Water” will appear when removed water is
draining from the APP.
“Collecting Air/ Water ” will appear when the APP is operating
normally.
“Startup Delay Mode” will appear for 10 minutes after the
APP evaporator shell cools to less than 40ºF (4ºC) and
the foul gas pressure exceeds 80 psig (5.5 barg).
“System Reset” will appear for 5 seconds after the System
Reset key has been depressed.
“2222 foul gas<80 psi” will appear when foul gas pressure
is lost and the display units are set to US.
“2222 foul gas< 5 bar” will appear when foul gas pressure
is lost and the diplay units are set to SI/metric.
“3333 evap temp>40 °F” will appear when the evaporator
temperature is too warm for effective air purging and the
display units are set to US.
“3333 evap temp> 4 °C” will appear when the evaporator
temperature is too warm for effective air purging and the
display units are set to SI/metric.
“4444 air purge>60min, Push RESET 4s to CLR” will appear
when air has been released for 60 minutes continuously
and the air purge limit is set to normal.
“7777 loss of lp liq” will appear when the liquid make-
up solenoid valve has been energized for 30 minutes
continuously.
ERROR HEATER FAULT will be displayed if the heaters are
on longer than 4 hours. This ERROR can only be cleared
by depressing the “SYSTEM RESET” key.
See Section 7, Troubleshooting for additional
information.
MAINTENANCE ITEM, RTC BACKUP
BATTERY
Replacement Battery:
DURACELL DL2032 or RAYOVAC CR2032
The coin cell battery, 3.0V Lithium, is used to provide
backup power to the real time clock. The battery and
battery low indicator are located in the lower right corner
of the PLC, see Figure 6. On certain models, the battery is
located underneath a control module. The battery should
be replaced every 5 years or when the LOW BATTERY
LED is illuminated.
Battery Replacement Procedure
The power to the AP Purger must be ON.
Lift the battery tab and press the battery out with your
finger or non-metallic tool.
To install a new battery, the battery polarity “+” must be
to the top side. Lift the battery tab and slide the battery
into place. Verify the LOW BATTERY LED is not illuminated.
Procedure is complete.
DL2032
3V
LOW
BATTERY
CPU
PWR
DS7
DS6 DS5
RAM BACKUP
BATTERY
PLC
LOW BATTERY LED
BATTERY TAB
BATTERY REPLACEMENT
Figure 6

12
APP-001b
APR 2007
SECTION 5 COMPONENT DESCRIPTIONS
WATER BUBBLER
Noncondensible gas from the AUTO-PURGER Plus flows
through the water bubbler where residual ammonia is
absorbed into the water. The water, with absorbed ammonia,
flows to a drain. The water bubbler fill line solenoid valve
(D) opens to automatically replenish water to the bubbler
each time the purge gas solenoid valve (C) energizes. The
water bubbler fill line solenoid valve (D) remains energized
for 30 seconds after the purge gas solenoid valve (C)
de-energizes (float switch magnet pulls in). Large, 1”
(25 mm) diameter bubbles in the water bubbler indicate
proper operation.
The water bubbler flush system consists of the water
bubbler, water bubbler fill line solenoid valve (D), water
check valve, and shut-off valve. Water is automatically
fed to the water bubbler through the water bubbler fill line
solenoid valve (D). Noncondensible gas and water mix,
absorbing residual amounts of ammonia into the water.
The ammonia-laden water is flushed to the water bubbler
drain through the overflow tube. The water bubbler fill
line solenoid valve (D) remains energized an additional
30 seconds after the float switch magnet pulls in. This
fills the water bubbler with fresh water for the next purge
cycle.
LIQUID DRAINER
The liquid drainer separates any liquid condensed in the
purge point piping. This liquid is fed to the low-pressure
liquid return line. Therefore, only foul gas—no liquid—
enters the condensing section of the purger. However,
if too much liquid comes down the foul gas line due to
improper piping, corrective action must be taken.
VAPOR TRAP
The vapor trap separates any vapor that flashes in the
low-pressure pumped liquid line piping. This vapor is fed
to the suction line. Therefore, only liquid—no vapor—flows
through the liquid make-up solenoid valve (B) to the
evaporator chamber of the purger.
CHECK VALVES
There are five check valves on the purger. A 1 psid (.07
bar) check valve with a 1/32” (.8 mm) diameter metering
orifice is installed on the purge gas line to prevent reverse
flow of water into the purger from the water bubbler. A 225
psid (15.5 bar) relief check valve from the float chamber to
suction line. A 1 psid (.07 bar) relief check valve from the
suction line to the float chamber. A 1 psid (.07 bar) check
valve in the water purge line to prevent reverse flow of
water into the purger from the customer supplied container.
The water bubbler fill line has a ½” check valve.
OPERATION OF PURGE GAS ORIFICE
A metering orifice disc is installed inside the 1 psid (0.07
bar) check valve in the purge gas line to the water bubbler.
See Figure 7. This 1/32” (0.8 mm) diameter orifice meters
the noncondensible gas into the water bubbler to prevent
over or under feeding. The ¼” NPT gauge valve should
be fully open during operation and closed for pump out
or maintenance.
OPERATION OF THE METERING VALVE
The metering valve meters condensed liquid refrigerant
from the high-pressure side of the purger into low-pressure
liquid-return line. The refrigerant is filtered through a
small flanged strainer prior to the metering valve, which
removes any particles that might block the orifice.
An indication of proper operation of the metering valve is
a frosted liquid feed line from the float switch chamber
through the solenoid valve, strainer and metering valve
to the low-pressure liquid-return line. If the line is not
frosted when the purger is in COLLECTING AIR AND
WATER mode, then the flow of refrigerant through the line
may be blocked due to dirt in the metering valve, strainer,
or solenoid valve.
The metering valve is set and held in place by a locking
knob. Unlock this knob using the .035” hex key wrench
provided inside the purger control cabinet. To clean the
orifice of the metering valve, fully open the metering
valve to flush out any particles. Then, close the valve and
reopen two turns.
If the line still does not frost, then pump out the purger
and inspect the strainer and metering valve.
PURGE POINT SOLENOID VALVES
For the customer-supplied purge point solenoid valves,
Hansen recommends our HS8A with close-coupled strainer.
This is a 1/2” port, heavy-duty, pilot-operated solenoid
valve with stainless steel piston. The purge point solenoid
valve must be a minimum of 1/2” port size to avoid excess
pressure drop across the valve.
The standard molded coil is for 115V, (208/230V or 24V are
available). Flange connections available are 1/2”, 3/4”, and
3/8” FPT, socket weld, and weld neck. To order, specify
catalog number HS8AST, required connection style and
size, and volts. Specify DIN plug solenoid connection if
needed.
Models APP08, APP16, and APP24 supply 115VAC to the
purge points regardless of whether 115VAC or 220VAC is
supplied to the control cabinet.

13 APP-001b
APR 2007
PURGE GAS SOLENOID VALVE
Figure 7
1/4" PURGE GAS GAUGE VALVE
WIDE OPEN DURING OPERATION
CLOSED FOR SERVICING PURGER
PURGE GAS
1/32" (0.8 MM) DIA
METERING ORIFICE
(0.07 BAR)
PURGE GAS TO WATER BUBBLER OR
TO CUSTOMER SUPPLIED WATER BOTTLE
CHECK
VALVE
SOLENOID VALVE
DISC INSTALLED IN
THE CHECK VALVE
1 PSID

14
APP-001b
APR 2007
SECTION 6 SERVICE, MAINTENANCE & PARTS
PURGER PUMP OUT PROCEDURE, WITH
AUTO-PURGER ON
1) Close the purge gas gauge valve to the water
bubbler.
2) Close the low-pressure pumped-liquid line shut-off
valve.
3) Close the foul gas line shut-off valve.
4) Close the water bubbler fill line valve.
The purger will pump down in several hours. To accelerate
the process, attach ammonia hoses to the oil drain valves
and pump out into a suction line. Close the low-pressure
liquid return line and the suction line to isolate the purger.
With electricity on, the pressure in the purger, as indicated
by both the high side pressure gauge and the low side
pressure gauge, should remain at zero. This process
should be completed only by knowledgeable refrigeration
technicians.

15 APP-001b
APR 2007
PARTS LIST
MECHANICAL
HLLSW Float Switch Assembly
20-1772 Water Bubbler Assembly, antisyphon (w/end connections)
20-1186 Metering Valve
20-1198 Metering Valve Seal Kit
20-1648 Metering Valve Strainer
20-1737
Screen Assembly Replacement Kit for above strainer, includes:
20-1535 Screen Assembly
78-0016 Strainer Cap Gasket
ST050 Water Purge Line Strainer
78-1001
Screen Assembly Replacement Kit for above strainer, includes:
78-0005 Screen Assembly
78-0016 Strainer Cap Gasket
70-1059 Plunger Kit for all purger solenoid valves
20-1183 Check Valve, 1 psid (.07 bar) with orifice
20-2489 Check Valve, 1 psid (.07 bar) no orifice
20-1185 Check Valve, 225 psid (15.5 bar)
20-1214 Check Valve Seal Kit for 1 psid and 225 psid check valves
20-1311 Liquid Drainer
20-2432 Vapor Trap
H5600R Relief Valve, 300 psi
ELECTRICAL
70-1088 Solenoid Coil, DIN plug - 115V, 50/60 Hz, 16 Watt
20-2428 Electric Heater, 115V, 50/60 Hz, 750 Watt
20-2477 Electric Heater, 230V, 50/60 Hz, 750 Watt
20-1279 Fuse, 2 amp, 115V purger
20-2402 Fuse, 15 amp, 115V purger
20-1695 Fuse, 3 amp, 220V purger
20-2463 Fuse, 8 amp, 220V purger
20-2403 PLC, 12 position
20-2416 PLC, 6 position
20-2405 PLC module, thermocouple input
20-2406 PLC module, current input
20-2407 PLC module, AC output
20-2408 PLC module, AC input/output
20-2409 PLC control console
20-2410 Heater Contactor
20-2411 Cable, PLC to Control Console
PSU 100-240VAC:24VDC Power Supply
HPT717 Water Concentration Sensor
SPSN-1 Liquid Make-up Level Sensor
SPSN-1 Low Liquid Level Sensor
20-2429 Plate Heater Temperature Sensor
20-2430 Liquid Temperature Sensor
20-2431 Evaporator Shell Temperature Sensor
75-3002 Pressure Transducer
20-2404 PLC module, AC input
20-2413 PLC module, DC input/relay output
20-2464 Transformer 220/115V

16
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APR 2007
SECTION 7 TROUBLESHOOTING
CONTROL CONSOLE DISPLAYS 2222
LOSS OF “FOUL GAS” PRESSURE. This usually means
the pressure in the air separator chamber is below 80 psig
(5.5 barg). The high side pressure gauge on the purger
reads near suction pressure. The purger will not allow
noncondensible gases to be released from the purger.
However, the purger will continue to operate normally in
all other functions.
REASON 1: A burned-out purge point solenoid coil.
Check: Check the 2 or 3 amp fuse for continuity. Replace
if necessary. Advance purge points one at a time with
the purge point advance button, waiting approximately
2 minutes before advancing again. Wait until the fuse
opens or the Control Console again displays 2222. The
faulty coil or wiring is now pinpointed.
Action: Replace the coil or repair the wire, and replace
the 2 or 3 amp fuse (p/n 20-1279 or p/n 20-1695).
REASON 2: A remote purge point solenoid valve is
jammed closed.
Check: Inspect the remote purge point solenoid valve
which caused the diagnostic code to appear. Manually
open the solenoid valve and recheck the pressure.
Action: If the coil is energized, clean and replace any
solenoid valve parts as necessary. See also the Caution
section on page 19.
REASON 3: “Foul gas” line restricted.
Check: Inspect the “Foul gas” line for a closed shut-off
valve(s) or the plastic shipping cap still in “foul gas”
line flange.
Action: Open shut-off valves and/or remove the shipping
cap. See also Caution section, page 19.
REASON 4: Faulty pressure transducer.
Check: With the purger in any operational mode, check
the pressure gauge reading. If it is above 80 psig, press
the STATUS functional pushbutton several times until
the pressures are displayed. Verify that the high side
pressure is greater than 80 psig (5.5 barg).
Action: If the high side pressure displayed is less than 80
psig (5.5 barg), replace the high side pressure transducer
(p/n 75-3002) with the purger at zero pressure. See also
the Caution section on page 19.
CONTROL CONSOLE DISPLAYS 3333
PURGER TOO WARM. If the purger evaporator
temperature is 40°F (4.4°C) or warmer, the purger will
not release noncondensible gas from the purger because
excessive refrigerant would also escape. The purger will
continue to operate normally in all other functions. This
code is also displayed during initial start-up until the
purger flooded evaporator is cooled down.
REASON 1: Suction temperature too high.
Check: Verify the pressure at the purger suction line
connection.
Action: Connect to a lower-temperature suction.
REASON 2: Restriction in the suction line.
Check: Inspect the suction line and shut-off valves. These
should be a minimum size of ¾”. On new installations,
also make sure the plastic shipping cap in suction line
flange is removed.
Action: Eliminate the restriction. See also the Caution
section on page 19.
REASON 3: The flooded evaporator inside the purger is
not filled with refrigerant.
Check: Look for a closed liquid line shut-off valve,
Also, check that the liquid line solenoid valve (B) is
energized.
Action: Open the liquid line shut-off valve. If not energized,
check for voltage at the liquid line solenoid valve coil.
Replace the coil if it is burned-out.
REASON 4: Faulty temperature sensor.
Action: Replace the evaporator shell temperature sensor
(p/n 20-2431).
REASON 5: Purger is in CONCENTRATING WATER
mode.
Check: Display Window states CONCENTRATING
WATER.
Action: No action is required. It is normal for the evaporator
to heat to warmer than 40°F (4.4°C) in this mode.

17 APP-001b
APR 2007
CONTROL CONSOLE DISPLAYS 4444
PURGED OVER 60 MINUTE TIME LIMIT. If noncondensibles
are released from the purger for 60 minutes continuously, a
time delay will close the purge gas solenoid valve (C). This
limits the possibility of a substantial amount of refrigerant
inadvertently being released into the water bubbler in the
unlikely event of purger malfunction.
REASON 1: A large volume of noncondensibles is
continuously being removed from system.
Action: Reset the time delay by pressing the RESET 4444
functional pushbutton on the Control Console. See
Figure 5. Delay is now reset for up to another hour of
continuous purging. Otherwise, put the purger in New
System Start-up mode for continuous purging without
the 60 minute time limit.
REASON 2: Purge gas solenoid valve (C) is not opening
or the removable seat/orifice is blocked.
Check: Make sure purge gas solenoid valve (C) is energized.
If not, check for voltage at solenoid coil.
Action: Replace the coil if it is burned-out, otherwise
clean or replace the valve. See also the Caution section
on page 19.
REASON 3: The shut-off valve located before the purge
gas solenoid valve (C) is closed.
Check: Verify that purge gas is not being sent to the
bubbler.
Action: Open the valve.
CONTROL CONSOLE DISPLAYS 7777
LOSS OF LOW-PRESSURE PUMPED-LIQUID. If the
liquid line solenoid valve remains energized for more than
30 minutes, it indicates there is insufficient low-pressure
pumped-liquid available to maintain an adequate level in
the flooded evaporator of the purger. The purger will not
purge air until this is corrected.
REASON 1: Liquid line solenoid valve (B) is not opening
or the seat/orifice is blocked.
Check: Make sure the liquid line solenoid valve (B) is
energized. If not, check for voltage at the solenoid
coil.
Action: Replace the coil if it is burned-out, otherwise
clean or replace the valve. See also the Caution section
on page 19.
REASON 2: Liquid line restricted.
Check: Look for closed shut-off valves in the pumped-
liquid line, plugged strainers, or the plastic shipping
cap still in the liquid line flange.
Action: Inspect piping for a closed shut-off valve. Open
the shut-off valves, clean the strainer, or remove the
shipping cap. See also the Caution section on page
19.
NONCONDENSIBLES ARE NOT BEING
RELEASED.
(See also page 16; Control Console displays 3333)
REASON 1: Noncondensibles not present in system.
Check: Compare the refrigerant liquid temperature from
condenser exit with the condensing pressure. The
pressure/temperature relationship should be within 2
or 3 psig (0.14 to 0.21 bar).
Action: None at this time.
REASON 2: Metering valve plugged.
Symptom: The purger appears to be operating properly,
however, the low-pressure liquid-return line is not
frosted.
Check: Fully open the metering valve to flush out any
particles. Then, close the valve and reopen two turns.
REASON 3: “Foul gas” line is flooded with liquid.
Symptom: The line from the bottom of the liquid drainer
often remains frosted.
Check: Inspect condenser and “foul gas” piping. In many
cases, the problem is liquid refrigerant being drawn
from the purge point. To prevent this from happening,
select purge point locations above liquid surfaces and
make sure purge point lines are installed so that only
vapor, and not liquid, can be drawn in. Refer to Piping
Instructions in Section 2 of this bulletin.
Action: Correct condenser and “foul gas” piping.
AMMONIA INSTEAD OF NONCONDENSIBLES
RELEASED FROM PURGER.
REASON 1: Purge gas solenoid valve (C) leaking at
seat.
Symptom: A slow leak of noncondensibles to the
bubbler.
Check: Look for dirt or a worn seat in the purge gas
solenoid valve (C).
Action: Remove, clean, or replace the solenoid tube
plunger or valve. See also the Caution section on
page 19.
REASON 2: Oil in purger.
Symptom: No frost around the low side oil drain valve.
Action: Remove oil through both the low side and high
side drain valves (See Figure 1) per safe refrigeration
procedures. See also the Caution section on page 19.
WATER BUBBLER DEVELOPS EXCESSIVE
MINERAL COATING.
REASON 1: Hard water.
Action: Add vinegar to the bubbler water. Then, clean with
the supplied brush. Use a water conditioning housing
and cartridge in the water supply line to the purger.

18
APP-001b
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THIS PAGE INTENTIONALLY BLANK

19 APP-001b
APR 2007
CAUTION
Hansen purgers are for refrigeration systems only. These
instructions and related safety precautions must be read
completely and understood before selecting, using, or
servicing these purgers. Only knowledgeable, trained
refrigeration technicians should install, operate, or service
these purgers. Stated temperature and pressure limits
should not be exceeded. Purger components should
not be removed from the purger unless the system has
been evacuated to zero pressure. See also the Safety
Precautions in the current List Price schedule and the
Safety Precautions Sheet supplied with this product.
Escaping refrigerant can cause injury, especially to the
eyes and lungs.
WARRANTY
All Hansen products, except electronics, are guaranteed
against defective materials or workmanship for one year
F.O.B. factory. Electronics are guaranteed against defective
materials or workmanship for 90 days F.O.B. factory. No
consequential damages or field labor is included.
ORDERING INFORMATION
Cat. No. Description
APP08 AUTO-PURGER Plus, 8 points
APP16 AUTO-PURGER Plus, 16 points
APP24 AUTO-PURGER Plus, 24 points
APPC AUTO-PURGER Plus for Plant
Computer
To Order: Specify catalog number and voltage. 115V
50/60Hz 17A is standard. 220V 50/60Hz 11A is available.
All models are suitable for ammonia only.

20
APP-001b
APR 2007
Hansen Technologies Corporation
6827 High Grove Boulevard
Burr Ridge, Illinois 60527 USA
Tel: [phone] Fax: [phone] Toll: 800.426.7368
Email: [email protected] Web: www.hantech.com
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© 2007 Hansen Technologies Corporation