Hansen AUTO-PURGER M Betriebsanleitung

SECTION 1 MOUNTING & PIPING INSTALLATION

An APM is usually installed in the compressor room where

it can be monitored, but also may be installed outdoors

where temperatures below freezing are not anticipated.

The APM comes standard with a watertight NEMA 13 (IP65,

Category 2) control cabinet enclosure with sealed conduit

wiring. Any unused electrical entrances to the enclosure

must be sealed to protect electronics from moisture. A

NEMA 4 cabinet enclosure is available.

An optional valve package (VPM) for purger isolation is

available from Hansen. This consists of three welded

assemblies which include shut-off valves, gauge valves,

and mating flanges. An illustration detailing this optional

valve package is on page 12 (Figure 13).

FOUL GAS PIPING

Purging at several points, up to four with the APM, on the

high-pressure side of the system is the best method for

removing foul gas. Foul gas is refrigerant gas containing

some air or other noncondensibles. Several points should

be used because it is nearly impossible to predict where

noncondensible gas will accumulate in a system.

Even for multipoint purging, only one purge point should be

purged at a time. Connecting two purge points from two

condensers or receivers may result in gas flowing from one

condenser to another. This is due to an unequal pressure

drop, even though the differences in pressure drop are

very small, for example ¼ psig (0.02 bar). The result would

be 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.

When utilizing multipoint purging, the purge point solenoid

valves can be manifolded into one foul gas line to the

purger. A ½" (13 mm) size line is the minimum and should

be pitched toward the purger to drain any condensed

liquid. Also, no liquid traps are allowed either before or

after the purge point solenoid valves (See Figure 2). The

foul gas line should not pass through cold areas where

INTRODUCTION

The AUTO-PURGER® M is a compact and totally automatic,

electronically-controlled, noncondensible gas refrigerant

purger for reducing condensing pressure, and thereby

saving electrical energy used by the refrigeration system.

This deluxe purger is preassembled, prewired, tested,

insulated, and includes an automatic water bubbler.

Installation requires piping the foul gas line, liquid line,

suction line, water line, drain line, and wiring the power

connection and the remote ½" (13 mm) port purge point

solenoid valves, which must be purchased separately. Up

to four (4) purge points can be controlled by this purger.

The AUTO-PURGER® M (APM) features welded piping

and watertight electrical construction. The APM meets

the requirements of the Canadian Standards Association

(CSA certified).

A typical APM installed in a plant with normal-entering

noncondensible loads will handle up to a 200 ton (700 kW)

system. Each purge point will be active between 10 and 30

minutes, depending on the noncondensible gas presence

(mostly air) and the purger mode of operation.

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. See page 13 for additional details.

MOUNTING INSTRUCTIONS

Mount the APM straight and securely on a wall or sturdy

steel channels capable of supporting 350 lbs (160 Kg). Eight

mounting holes in the frame are provided to support the

purger (See Figure 1). The APM should be located in an

accessible area, but away from the movement of equipment

that could accidentally damage the purger. Elevation with

respect to condensers or high-pressure receivers is not

critical, however, purge point solenoid valves must be

above the purger.

Specifications, Applications,

Service Instructions & Parts

AUTO-PURGER®M

“Energy Saver”

Compact, Non-condensible

Gas (Air) Purger

Bulletin APM-001e

AUG 2015

For Models APM & APMF

Model APM

APM-001e

AUG 2015

further condensing of the saturated gas can occur. If this

cannot be avoided, the line must be insulated because

flooded purge point lines result in flooding the APM with

liquid, causing a temporary halt of noncondensibles

being removed. If flooding can not be avoided, additional

condensate drainage may be necessary.

It is important that all purge points be located above any

liquid surfaces to avoid drawing liquid refrigerant, rather

than vapor, into the APM.

EVAPORATIVE CONDENSER PIPING

Typically, evaporative condenser outlet liquid drain lines

on each circuit must drop a minimum of 4 feet (1.2 m) for

ammonia from the centerline of the evaporative 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 to prevent liquid from backing up into one or more

condensers, and thereby flooding the purge point. Most air

from the system will normally be trapped between the

condenser and the P trap. Also, 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. Hansen Technologies

can provide copies of these articles. Also, consult the

condenser manufacturers’ installation instructions for

additional piping and sizing information.

On evaporative condensers, avoid using one purge point

solenoid valve to purge two circuits. This practice negates

the P-trap on the condenser drain line because of the

purge connections of the two circuits and may back liquid

up into one circuit.

ACTIVE PURGE POINT

1234

ENERGY SAVER

HANSEN TECHNOLOGIES

CORPORATION

(25)

(298)

ON HIGH PRESSURE CONDENSERS AND RECIEVERS

PROTECTED SUCTION ACCUMULATOR

(24)

(86)

(192)

TYPICAL

(16)

(508)(813)

(152)

FOR POWER CONNECTION

FOR REMOTE PURGE POINT

SOLENOID VALVE CONNECTIONS

(86)

(359)

(49)

(457)

OIL DRAIN CONNECTION (3/8" FPT)

TYPICAL

(16)

(14)

MOUNTING HOLE

8 PLACES

(59)

(130)

(178)

SHUT-OFF VALVE CONNECTION

PRESSURE RELIEF VALVE

(406)

(464)

CONNECTION

1" PVC DRAIN

WALL OR COLUMN

18.25"

BUBBLER

CONTROL CABINET

1/2" CONNECTION FOR OPTIONAL

1/2" FPT WATER LINE

7.00"

3/4" SUCTION LINE

5.11"

0.53" DIA

0.62"

18.00"

HIGH PRESSURE SEPARATOR

LOW PRESSURE SEPARATOR

1.93"14.13"

3/4" CONDUIT KNOCK OUT

1/2" CONDUIT KNOCK OUT

6.00"

32.00"

20.00"

0.62"

3/4" SUCTION LINE CONNECTION TO

1/2" HIGH PRESSURE LIQUID LINE CONNECTION

1/2" FOUL GAS'' LINE CONNECTION FROM PURGE POINTS

3.38"

16.00"

2.31"

1.00"

0.94"

3.38"

7.56"

11.75"

1.63" (41 MM)

INSTALLATION DIMENSIONS (MM)

Figure 1

FROM FOUL GAS SOURCE

CLOSE-COUPLED

ISOLATION

TO PURGER

1/2" (13 MM) PORT

SHUT-OFF VALVE

REMOTE PURGE POINT

SOLENOID VALVE

ISOLATION SHUT-OFF VALVE

STRAINER

(GLOBE VALVE STEM HORIZONTAL

IS PREFERRED)

LEVEL OR

PITCH DOWN

SECTION 1 MOUNTING & PIPING INSTALLATION

3APM-001e

AUG 2015

ACTIVE PURGE POINT

1234

ENERGY SAVER

HANSEN TECHNOLOGIES

CORPORATION

(25)

(298)

ON HIGH PRESSURE CONDENSERS AND RECIEVERS

PROTECTED SUCTION ACCUMULATOR

(24)

(86)

(192)

TYPICAL

(16)

(508)(813)

(152)

FOR POWER CONNECTION

FOR REMOTE PURGE POINT

SOLENOID VALVE CONNECTIONS

(86)

(359)

(49)

(457)

OIL DRAIN CONNECTION (3/8" FPT)

TYPICAL

(16)

(14)

MOUNTING HOLE

8 PLACES

(59)

(130)

(178)

SHUT-OFF VALVE CONNECTION

PRESSURE RELIEF VALVE

(406)

(464)

CONNECTION

1" PVC DRAIN

WALL OR COLUMN

18.25"

BUBBLER

CONTROL CABINET

1/2" CONNECTION FOR OPTIONAL

1/2" FPT WATER LINE

7.00"

3/4" SUCTION LINE

5.11"

0.53" DIA

0.62"

18.00"

HIGH PRESSURE SEPARATOR

LOW PRESSURE SEPARATOR

1.93"14.13"

3/4" CONDUIT KNOCK OUT

1/2" CONDUIT KNOCK OUT

6.00"

32.00"

20.00"

0.62"

3/4" SUCTION LINE CONNECTION TO

1/2" HIGH PRESSURE LIQUID LINE CONNECTION

1/2" FOUL GAS'' LINE CONNECTION FROM PURGE POINTS

3.38"

16.00"

2.31"

1.00"

0.94"

3.38"

7.56"

11.75"

1.63" (41 MM)

TYPICAL APPLICATION

Figure 2

FROM FOUL GAS SOURCE

CLOSE-COUPLED

ISOLATION

TO PURGER

1/2" (13 MM) PORT

SHUT-OFF VALVE

REMOTE PURGE POINT

SOLENOID VALVE

ISOLATION SHUT-OFF VALVE

STRAINER

(GLOBE VALVE STEM HORIZONTAL

IS PREFERRED)

LEVEL OR

PITCH DOWN

SECTION 1 MOUNTING & PIPING INSTALLATION

PURGE POINT VALVE (TYPICAL)

Figure 3

APM-001e

AUG 2015

PURGE POINT CONNECTIONS

Foul gas lines from condensers should be purged at points

recommended by the condenser manufacturer. Usually, this

is at the top of each circuit’s outlet header which drains

down through a P-trap to the receiver. 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, preferably at a “dead” area

away from condenser drain pipes. Below is a typical valve

arrangement for a purge point (Figure 3). Regardless of

the purge point location, it is absolutely necessary to

ensure that liquid is not drawn into the foul gas line.

WATER LINE

The APM has an automatic water bubbler to eliminate any

water bottle attention. Connect the water supply to the

purger water shut-off valve (See Figure 1). Water pressure

should be between 30 and 80 psig (2 and 5 bar). The

factory-installed flow controller limits the amount of water

going into the bubbler.

The transparent 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 brush supplied. A water

conditioning filter cartridge and housing are available for

abnormally hard water.

DRAIN LINE

A 1” PVC socket water drain connection is located at the

bottom of the bubbler (an alternate 1” FPT threaded adapter

is also supplied). The water should flow to a suitable drain.

Initially, fill the water bubbler with water via the threaded

plug located at the top of the bubbler. Keep the plug

lubricated and hand tight. A circular, thin, plastic “stick-

on” acts as a bubbler relief device in case of water drain

plugging. The drain line should be supported to prevent

undue stress on the water bubbler.

OIL DRAINS

There are two 3/8” valve oil drain connections near the

bottom of purger (see Figure 1) from which oil can be

drained. These valves are fitted with 5/16” (8 mm) hex

socket plugs. Before draining oil, first close the liquid and

foul gas lines to prevent additional liquid from entering the

purger. Wait approximately one half hour and then turn

the purger off. Allow the purger to pump out, then close

the suction line shut-off valve. Use normal refrigerant oil

draining precautions to prevent human or property damage.

In general, oil will not be a problem unless the liquid line

is connected to a vessel or line where oil can enter the

purger. See also the Caution section on page 14. Escaping

refrigerant may cause personal injury, particularly to the

eyes and lungs.

LEAK TEST

Use standard refrigeration procedures to check the APM

for leaks before placing it into service. See also the

Caution section on page 14. Manually open one purge

point solenoid valve. Open the foul gas line shut-off valve

and wait a few moments for the flooded evaporator to

pressurize through the metering orifice. Allow pressure to

build to condensing pressure, as shown on the high side

pressure gauge. Close the foul gas line shut-off valve and

check the purger for leaks.

Where a high-pressure float regulator is used to drain one

or more condensers, the top of the float valve chamber

should also be a purge point.

Horizontal shell and tube water-cooled condensers, and

heat exchangers should be purged at the top, usually at

the point(s) 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 normally not advisable to purge controlled pressure

receivers, high-pressure thermosyphon vessels, or vessels

located on the low side of the system.

SUCTION LINE

The ¾” suction line from the purger should be connected

to a protected main suction line or a suction accumulator.

Install a suction line isolation shut-off valve near purger.

Excess amounts of liquid from the purger evaporator may

occasionally be transmitted through the suction line. The

suction temperature must be 40°F (4.4°C) or less to satisfy

the APM temperature sensor before purging will occur.

LIQUID LINE

A high-pressure ½” liquid line is required for the APM. The

connection to the high-pressure liquid source should be

a location where oil will not be directed into the purger.

Install liquid line shut-off valve near the purger. The liquid

line supplies refrigerant during start-up and feeds make-

up liquid as required. The only requirement is the liquid

supply pressure must be sufficiently above the purger

evaporator pressure, usually greater than 60 psi (4.1 bar).

During operation, only 5% of the liquid refrigerant required

for cooling comes from the liquid line. The remainder of

the refrigerant is condensate from the foul gas line, which

is collected in the drain, condensed in the coil, and into

the evaporator.

SECTION 1 MOUNTING & PIPING INSTALLATION

5APM-001e

AUG 2015

ELECTRICAL CONNECTIONS

The standard electrical requirement for the APM is 115V

50/60 Hz. Also available is 230V 50/60 Hz. Main supply

voltage fluctuations should not to exceed ± 10% on nominal

voltage. Connect APM to a dual pole external switch or

circuit breaker suitable for full disconnection. Locate this

switch or circuit breaker nearby. The control cabinet has

a bottom ½” knockout for power connection and bottom

3/4” knockout for individual purge point solenoid valves

(See Figure 4). Any additional knockouts, if necessary,

should be made on the bottom of the control cabinet. A

grounding block inside the control cabinet is provided for 3

wire purge point solenoid coils. Carefully study the wiring

diagram below (Figure 5) to avoid electrical short circuits.

Connect electrical wiring from each purge point solenoid to

the remote purge point solenoid plug-in connector screw

terminals (1 through 8) plus the grounding block. Normally,

the voltage of the remote purge point solenoid valves is the

same as the purger. However, if the purge point solenoid

valve coil voltage is different, simply remove and discard

the factory installed jumpers between terminals 13 & 14 and

15 & 16. Bring the purge point solenoid line (L1) connection

to terminal 14 and neutral (L2) to terminal 16.

SECTION 2 ELECTRICAL INSTALLATION & OPERATION

RESET PINS

NLLLN NNLLN

PRESSURE TRANSDUCER

PLUG-IN CONNECTORPOWER BOARD

COAXIAL CONNECTORS 1/2'' KNOCKOUT

POWER / INTERLOCK

PLUG-IN CONNECTOR

GROUNDING BLOCK

POWER BOARD

REPLACEABLE 3 AM

REMOTE PURGE

POINT SOLENOID

REPLACEABLE 3 AM

PURGER SOLENOID

PLUG-IN CONNECTOR

CONTROL BOX LATCH

CONTROL BOARD

CONTROL BOAR

PLUG-IN CONNECTOR

TEMPERATURE SENSOR

3/4'' KNOCKOUT

REMOTE PURGE

POINT SOLENOID

PLUG-IN CONNECTOR

3FUSE (P/N 20-1698)

FUSE (P/N 20-1698)

2-LOW SIDE LEVEL SENSOR

1-DRAINER LEVEL SENSOR

3-HIGH SIDE LEVEL SENSOR

PURGE POIN

ENABLE SWITCHES

F6A

F6B

CABL

RTV SILICONE SEALANT

AND SHIELD

GROUNDING WIRE

CONTROL CABINET (INSIDE VIEW)

Figure 4

WIRING DIAGRAM

Figure 5

16151413121110987654321

#1 #2 #3 #4

PURGE POINT SOLENOID VALVES

FACTORY-INSTALLED JUMPER

OPTIONAL INTERLOCK

(REMOVE JUMPER IF USED)

#2 #3 #4

POWER BOARD

FIELD INSTALLED WIRING

LINE

NEUTRAL

LINE VOLTAGE

POWER BOARD REPLACEABLE

3 AMP TYPE F FUSE (P/N 20-1698) REPLACEABLE 3 AMP TYPE F FUSE

REMOTE PURGE POINT SOLENOID

(P/N 20-1698)

APM-001e

AUG 2015

FEATURES OF THE APM

The purger can be set to one of several operating modes

to suit the requirement of the system. These include:

Automatic Operation, Manual Operation, New System Start-

up, and Purger Switched Off. The mode of operation can

be selected by repeatedly pushing the program advance

button on the front panel until desired purger mode light

is on. (See Figure 6).

AUTOMATIC OPERATION

The Automatic Operation mode is where the purger should

be set when normal levels of noncondensibles are in the

refrigeration system. The microprocessor-based electronics

of the APM uses its “logic” to locate noncondensibles

and spend more time purging those points. The purger

will energize the first enabled purge point solenoid (see

page 7, Purge Point Enable Switches). If after 10 minutes

noncondensible gases are not released, the purger then will

advance to the next enabled purge point. If noncondensibles

are released at any purge point within the first 10 minutes,

then the purger will continue to process gas and remain at

that purge point for increments of 10 minutes as long as

noncondensible gas is released during the 10 minute time

period. This “smart” feature will continue for a maximum

of 30 minutes. After 30 minutes, the purger will go on to

the next active purge point regardless if noncondensibles

are released. Once noncondensible gases have been

minimized, and enabled purge points cycle without releasing

noncondensibles, the purger will go into “Standby” mode

for two hours (the Standby purger status light will be on).

After two hours on Standby, the purger will then resume

operation to seek out noncondensible gases that may

have collected.

MANUAL OPERATION

Manual Operation mode allows the operator to select one

purge point continuously. This is usually the case if a

large volume of noncondensible gas is suspected to be at

a particular point. To select this mode, push the program

advance button until the Manual Operation purger mode

light is on. Then, push the purge point advance button to

select the purge point. In this mode, the purger will purge

this point only. However, noncondensibles must be present

for the purger to release gas from the purger. If not, the

purger will go into Standby mode.

NEW SYSTEM STARTUP

The New System Startup mode is to be used when the

refrigeration system is known to contain large amounts

of noncondensible gas. This may be due to new system

startup, extensive repairs to a system, or the presence of

an abnormal vacuum leak on the low side of the system.

The APM automatically sequences the purge point solenoid

valves for a fixed period of 10 minutes each to remove air

from each of the enabled purge points. The purger will

not go into Standby mode while in New System Startup

mode.

PURGER SWITCHED OFF

When the purger is in this position, all solenoid valves close

and the purger will pump out if the suction valve is open.

CONTROL CABINET (FRONT VIEW)

Figure 6

HANSEN TECHNOLOGIES

CORPORATION

PURGE

POINT

ADVANCE

PROGRAM

ADVANCE

PURGING

STANDBY

SEE DIAGNOSTICS ON RIGHT SIDE OF ENCLOSURE

MANUAL OPERATION

NEW SYSTEM STARTUP

PURGER SWITCHED OFF

PURGING LOG (MINUTES)

(DIAGNOSTIC CODE WHEN FLASHING)

ZERO

RESET

ACTIVE PURGE POINT

AUTOMATIC OPERATION

ENERGY SAVER

1234

RESET BUTTON

PURGING LOG

POINT LIGH

ACTIVE PURG

PURGER

MODE LIGHTS

CONTROL CABINE

ENCLOSURE

ADVANCE BUTTON

PURGE POINT

BUTTON

PROGRAM ADVANC

STATUS LIGHTS

PURGER

DIGITAL READOUT

(TYPICAL

)

SECTION 2 ELECTRICAL INSTALLATION & OPERATION

7APM-001e

AUG 2015

ACTIVE PURGE POINT

The front of the control cabinet has lights which indicate

the active purge point. The active purge point can be

manually advanced in any operational mode by pushing

the purge point advance button.

PURGER STATUS LIGHTS

There are two purger status lights on the front of the control

cabinet next to the digital readout. These are the Purging

status light and Standby status light which indicate when

noncondensible gas (air) is being released from the purger

(Purging), or when the purger is in a waiting mode (Standby).

PURGING LOG

The purging log is displayed on the digital readout. It

displays the number of minutes the purge gas solenoid valve

into the water bubbler.

The purger log can be used to track the release of

noncondensible gas. If a daily or weekly record is kept, then

any abnormal increases in the amount of noncondensible

gases can be noted, and corrective measures can be taken.

Little or no activity compared to normal operation may

indicate noncondensibles have been thoroughly removed

or a problem with the purger. Frequent activity beyond

normal could mean excessive new leakage of air into the

system. To reset the purge log, push the zero reset button

next to the digital readout on the front panel.

DIAGNOSTIC FEATURES

Although the APM is very reliable, after an extended

operation or under severe conditions, problems may

occur or be suspected. Under these conditions, due to

the importance of the purging functions, restoration to

normal operation is desired as quickly as possible. The

APM features diagnostic codes which are displayed on the

digital readout when abnormal operation of the refrigeration

system or the APM is detected. These flashing numbers

help to identify the problem area. Below is a quick reference

to these diagnostic codes. The digital readout will display

the diagnostic code related to the occurrence which first

put the APM into this mode; exception, 6666 will override

7777. Also see the troubleshooting guide on page 10 for

detailed explanation.

Flashing 2222 LOSS OF FOUL GAS PRESSURE.

Flashing 3333 PURGER TOO WARM.

Flashing 4444 PURGED OVER 60 MINUTE TIME LIMIT.

Flashing 5555 PURGER SHUT-OFF REMOTELY.

Flashing 6666 LEVEL CONTROL OUT OF RANGE.

Flashing 7777 LOSS OF HIGH-PRESSURE LIQUID.

PURGE POINT ENABLE SWITCHES

These switches are located on the control board and are

all factory-set to the ON position. They control whether

or not a purge point can become active. If for example,

only three purge points are being utilized, the number 4

purge point enable switch should be in the downward off

position (see Figure 7). By doing this, the unused purge

point is disabled and purger time is not wasted.

PUMP OUT PROCEDURE

Performing certain types of service on the APM may first

require the purger to be pumped-out (drained of liquid

refrigerant). To begin pump-out, shut off the foul gas

and high-pressure liquid lines. Wait for all refrigerant to

evaporate to suction; this usually takes several hours to

complete. Using safe refrigeration practices, reduce the

pressure to zero. In addition to following these procedures,

check the lower portion of drainer and the APM piping for

signs of frost. If there is no frost, pump-out is probably

complete. If there is frost, this means excess refrigerant

is still in the drainer and/or piping. To drain, energize the

drainer solenoid valve.

To accelerate the pump out process, attach ammonia hoses

to the oil drain valves. Close the main suction line to the

purger. Using the oil drain valves, pump out to a lower

suction pressure than the main purger suction line. When

pumped out, close the oil drain valves and leave the main

suction line closed to isolate the purger. With electricity

on, the pressure in the purger should remain at zero. This

process should be completed only by knowledgeable

refrigeration technicians.

CONTROL BOARD

Figure 7

SECTION 2 ELECTRICAL INSTALLATION & OPERATION

APM-001e

AUG 2015

SOLENOID VALVES

The APM is equipped with four solenoid valves. These are:

the liquid drainer solenoid valve (A), the liquid line solenoid

valve (B), the purge gas solenoid valve (C), and the water

solenoid valve (D). See Figure 11. With the exception of the

water solenoid valve, each is directly welded in-line and

has a stainless steel removable seat/orifice (see Figure 8).

The removable seat/orifice facilitates easy access to the

orifice for inspection or replacement. If necessary, the

water solenoid valve (D), whose brass body has threaded

ends, can easily be replaced or parts thereof changed.

Figure 8

LIQUID DRAINER

The liquid drainer removes any condensed liquid that trickles

from the foul gas line into the purger. This enables the

purger to always be condensing gas, rather than having

liquid entering the condensing section of the purger and

limiting proper operation. The drainer solenoid valve (A)

will open to empty a reasonable amount of excess liquid

directly to the flooded evaporator. However, if too much

liquid comes down the foul gas line, due to improperly

piped condensers, corrective action must be taken. See

the Foul gas piping section on page 3.

STRAINER/ORIFICE

The strainer/orifice meters condensed liquid refrigerant

from the high-pressure side of the purger into its flooded

evaporator. It features a dual filter arrangement to reduce

potential orifice blockage. This dual filter (strainer) removes

particles and houses the integral orifice (strainer/orifice

screen assembly). See Figure 10.

In addition, separate remote point solenoid valves are

required, one for each enabled purge point. These are not

included with the APM. The Hansen type HS8 solenoid

valve having a ½” (13mm) port and a stainless steel piston

is recommended. Below is a typical purge point solenoid

valve with close-coupled strainer (Figure 9).

Figure 9

REMOVABLE

SEAT/ORIFICE

CHECK VALVES

There are three check valves on the purger. An 80 psid

(5.5 bar) differential check valve is installed on the purge

gas line to prevent any possibility of reverse flow of water

into the purger. A 225 psid (15.5 bar) differential relief

check valve leads from the condensing coil inlet to the

suction line; this prevents excessive purger pressure. A

third check valve is installed from the liquid drainer to the

evaporator coil to prevent reverse flow with a temporary

loss of foul gas pressure.

WATERTIGHT

ENCAPSULATED

COIL

STAINLESS

STEEL PISTON

MANUAL OPENING

STEM

CLOSE-COUPLED

STRAINTER

REMOVABLE SEAT

ORIFICE

WATER BUBBLER

The APM is equipped with a water bubbler which eliminates

any water bottle attention. Purge gas (noncondensibles)

from the purger flows into the bottom of the water bubbler

where residual ammonia can be absorbed into the water.

The water with absorbed ammonia flows to a drain. The

water solenoid valve (D) opens to automatically replenish

water to the bubbler each time the purge gas solenoid

valve (C) energizes. A 30-second delay keeps the water

solenoid valve (D) open after the purge gas solenoid valve

noncondensibles through the bubbler is usually indicated

by large, 1/2" (13mm) diameter bubbles.

STRAINER/ORIFICE

SCREEN ASSEMBL

STRAINER/ORIFICE

BODY

STRAINER/ORIFICE

BODY

STRAINER/ORIFICE

SCREEN ASSEMBLY

SECTION 2 ELECTRICAL INSTALLATION & OPERATION

Figure 10

9APM-001e

AUG 2015

The APM 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.

Keep the control cabinet door closed at all times to

prevent water damage and tampering.

PURGER START-UP SEQUENCE

On start-up, liquid refrigerant fills and begins to cool the

purger. The liquid line solenoid valve (B) energizes to

feed refrigerant to the flooded evaporator. The low side

level sensor, located on the side of the flooded evaporator,

senses when liquid reaches the proper level. The display

should show 3333.

At the same time the flooded evaporator is filling, foul

gas enters the flooded evaporator condensing coil and

the refrigerant gas contained therein changes state to a

liquid. The liquid and noncondensible gas gradually fill

the air separator chamber.

As the purger continues to cool down, a temperature sensor

attached to the flooded evaporator senses temperature.

At approximately 40°F (4.4°C) evaporator temperature, the

readout will no longer display 3333 and the purger will

enter the mode selected.

Foul gas is continually processed as long as a remote

purge point solenoid is energized. It is important that

one, but only one, remote purge point solenoid valve is

open at all times to prevent losing foul gas pressure to the

purger. If foul gas pressure is lost (as sensed by pressure

transducer), diagnostic code 2222 flashes on the APM

digital readout. No purging of air will occur until foul gas

pressure is restored.

OPERATION

The foul gas may carry a certain amount of condensed

refrigerant which is captured by the liquid drainer before

it enters the flooded evaporator coil of the purger. The

drainer level sensor operates solenoid valve (A) to drain

the liquid directly into the low-pressure flooded evaporator.

This separation step enables the liquid refrigerant to bypass

the purger’s flooded evaporator condensing coil.

The liquid-free foul gas enters the condensing coil, which

is submerged in the cold liquid refrigerant of the flooded

evaporator. The refrigerant gas condenses while the

noncondensible gas passes into the air separator chamber.

The condensed liquid refrigerant is removed from the air

separator chamber through the strainer with integral orifice,

and passed into the low-pressure side of the flooded

evaporator.

Meanwhile, the noncondensible gas collects in the air

separator chamber. The collected noncondensible gas

gradually depresses the liquid level causing the high side

level sensor to open both the purge gas solenoid valve

noncondensible gas and water mix so that residual amounts

of ammonia can be absorbed. The waste water is flushed

to the drain through the overflow tube.

The purger will cycle each enabled remote purge point

solenoid valve in sequence, when the purger is on Automatic

Operation or New System Start-up. The Purger will remain

at the selected purge point when in Manual Operation.

SECTION 3 APM OPERATION

Figure 11

APM-001e

AUG 2015

DIGITAL READOUT FLASHING 2222

LOSS OF FOUL GAS PRESSURE. This usually means

the pressure in the air separator chamber is below 80 psig

(5.5 bar). 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 remote purge point solenoid 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 digital readout

again flashes 2222. The faulty coil or wiring is now

pinpointed.

Action: Replace the coil or repair the wire, and replace

the 3 amp fuse (p/n 20-1698).

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 14.

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 14.

REASON 4: Faulty pressure transducer.

Check: With the purger in any operational mode, check

the pressure gauge reading. If it is above 80 psig, check

pressure transducer plug-in connector terminals 27 &

30 for 10 volts DC. Then check terminals 28 & 29 for at

least 13 mV.

Action: If terminals 27 & 30 do not have 10 volts DC, check

for faulty wiring. If terminals 28 & 29 do not have at least

13 mV, replace the pressure transducer (p/n 20-1857)

with the purger at zero pressure. See also the Caution

section on page 14.

DIGITAL READOUT FLASHING 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 14.

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.

Check: With the temperature sensor plug-in connector

disconnected from power board (see Figure 4), check

the electrical resistance of the sensor across the wire

leads.

Action: If the resistance is not between 30 K ohms and 486

K ohms, replace the temperature sensor (p/n 20-2303).

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