AUTO-PURGER® APNoncondensible Gas (Air) Refrigerant Purger

Bulletin AP-003hMarch, 2003

OPERATOR INSTALLATION& INSTRUCTION MANUAL

For Models AP01, AP08, AP16, AP24, and APCEuropean Versions AP01E, AP08E, AP16E, AP24E, and APCE

Model AP08

Table of Contents

Section 1 Mounting andPiping Installation .................................................. 2

Section 2 Electrical Installation andMechanical Component Operation ..................... 6

Section 3 AUTO-PURGER Operation ....................... 12

Section 4 Troubleshooting Purger Operation ....... 14

Parts List ....................................................................... 18

Selecting an AUTO-PURGER ..................................... 20

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The AUTO-PURGER is a totally automatic, electronically-controlled noncondensible gas (air) refrigerant purgerfor reducing condensing pressure. The deluxe models—AP08, AP16, and AP24—are pre-assembled, pre-wired,insulated, and include an automatic water bubbler.Installation requires piping the foul gas line, liquid line,suction line, water line, drain line, and power connection,and wiring the remote purge point solenoid valves. Purgepoint solenoid valves must be purchased separately andmust be a minimum of ½� (13 mm) port size.

In addition, a computerized model—APC—is availablewhere a separate plant computer or programmable logiccontroller (PLC) is used to start and stop the AUTO-PURGER and independently operate the various remotepurge point solenoid valves.

The basic AUTO-PURGER—Model AP01—is the sameconstruction less insulation, automatic water bubbler,water solenoid valve, 7-day time clock, and sequencetimer for remote multi-point purge solenoid valves. Theinsulation and automatic water bubbler flush system canbe factory added or field upgraded.

The internal surface area and flooded evaporator efficiencygives the AUTO-PURGER two to three times the foul gascondensing capacity of an Armstrong Purger and 10times the capacity of purgers with small electric hermeticcompressors. In a system with normal noncondensibleloads, all models will handle a 750 ton (2600 kW) ammoniaplant at suction pressures below atmospheric pressureor a 1500 ton (5300 kW) ammonia plant at positive suctionpressures. The amount of noncondensibles in the systemis based on many factors including age, maintenancepractices, and operating temperature.

The number of purgers required for a system depends onthe number of installed purge points. Twenty-four purgepoints is the maximum practical number per purger. Forexample, a system with 24 points set to purge for 10minutes 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 purgershould be used and the purge points divided equallybetween the two purgers.

The AUTO-PURGER can operate over a wide range ofcondensing pressures. This is important for refrigerationsystems that operate at low condensing pressures duringcold ambient conditions.

MOUNTING INSTRUCTIONSMount the AUTO-PURGER securely on a wall or sturdysteel channels capable of supporting 450 lbs(205 Kg). Eight mounting holes in the frame are providedto support the unit. See Figure 1. The unit should belocated in an accessible area, but away from movingequipment that could accidentally come in contact withthe purger. Elevation with respect to condensers or high-pressure receivers is not critical. Do not punch accessholes in the top of the control cabinet. Unused electricalentrances to the enclosure must be sealed to protect thecontrols from moisture.

The AUTO-PURGER is normally installed in the compressorroom where it can be monitored, but also may be installedoutdoors where temperatures below freezing are notanticipated. For outdoor use, areas near falling or spraying

SECTION 1 MOUNTING & PIPING INSTALLATION

water, or in constant high humidity areas, an optionalNEMA 4 enclosure with sealed conduit wiring isrecommended.

Install float switch assembly on purger by removingpackaging material and metal shipping tube. Slip floatswitch assembly over enclosing tube being sure thefloat switch assembly bottoms on the neck on the

For the single point purger, Model AP01, the foul gas lineis brought directly from the purge point on the condenseror receiver to the purger. During operation, the AUTO-PURGER’s foul gas solenoid valve (#4) located on thepurger, energizes when the purger’s evaporator chamberis cooled to approximately 20°F (–7°C).

FOUL GAS PIPING FOR MULTIPOINTPURGINGModels AP08, AP16, AP24, and APCIt is nearly impossible to predict where noncondensiblegases (air) will accumulate. Therefore, purging at severalpoints on the high-pressure side of the system is thebest method for removing air from the system.

For multipoint purgers, the solenoid valves may bemanifolded into one line to the purger. However, onlyone purge point should be purged at a time. Connectingtwo purge points together may result in gas flowingfrom one condenser to another due to unequal pressuredrop, even though the difference in pressure drops isvery small, for example ¼ psi (0.02 bar). The result is thateven in the best of circumstances, only one point iseffectively purged. The best practice is to purge eachcondenser and receiver circuit separately.

enclosing tube. �������� For ammonia purgers, tightenthe retaining screw such that the screw tip is in thegroove of the neck assembly. Note: the freon purgershave a spacer with a set screw which is tightened on theneck assembly. If the float switch assembly is not properlypositioned and retained, the switch may not function.

PIPING INSTRUCTIONSIt is extremely important to install purge points at locationssure to be liquid free. Also, no liquid traps are desirableeither before or after purge point solenoid valves. SeeFigure 2. The line from the purge point on the condenserto the AUTO-PURGER should not pass through coldareas where further condensing of the saturated gas canoccur. If this cannot be avoided, the purge line must beinsulated because flooded purge point lines will floodthe AUTO-PURGER with liquid, resulting in a temporaryhalt of noncondensibles being removed.

The minimum line size for foul gas piping is ½�(13 mm). The line should be pitched down toward thepurger to drain any refrigerant that may condense.

It is important that one purge point solenoid valve isopen at all times to prevent losing foul gas pressure tothe purger. An optional differential pressurestat system(DPS) can be used to safeguard against loss of foul gaspressure.

FOUL GAS LINESModel AP01

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EVAPORATIVE CONDENSER PIPINGTypically, evaporative condenser outlet liquid drainlines on each circuit must drop between 4 ¢¢¢¢¢–6¢¢¢¢¢ (1.2m–1.8m) for ammonia and 8 ¢¢¢¢¢–12¢¢¢¢¢ (2.5m–3.7m) forhalocarbons from the centerline of the condenseroutlet to the centerline of highest elevation of theliquid line manifold to receiver. Preferably each circuitshould have a P-trap to balance variations in pressuredrop in each circuit and to prevent liquid from backingup into one or more condensers, flooding the purgepoint. A properly-sized equalizer line from the receiverwill help drain condenser circuits into the receiver.Refer to ASHRAE guidelines or recent IIAR paperson condenser piping design. Also, consult condensermanufacturers installation instructions for additionalpiping and sizing information.

Do not use one purge point solenoid valve to purgetwo circuits. This negates the P-trap on the condenserdrain line and may back liquid up into one circuit.

Where a high-pressure float regulator is used todrain one or more condensers, the top of the floatvalve 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 thecompressor discharge main inlet. Vertical condensersshould be purged near the top of the vessel if possible.

For certain types of oil separators where very lowvelocities may exist near the top of the vessel, purgingmay be advisable from a top fitting.

It is not necessary to purge control pressure receivers,high pressure thermosyphon vessels, or vesselslocated on the low side of the system.

SUCTION LINEA ¾ ²²²²² (20 mm) suction line should be connected to aprotected main suction line or can be piped to asuction accumulator. The purger thermostat is factoryset at 30°F (–1°C). To allow for temperature transferlosses between the purger evaporator and thethermostat sensor, the suction temperature shouldbe approximately 20°F (–7°C) or below to close thethermostat. This then switches the AUTO-PURGERfrom its PURGER COOLING DOWN mode to itsAUTOMATIC or MANUAL PURGING mode. For highersuction temperatures, consult the factory.

Figure 1. AUTO-PURGER AP installation dimensions.

PURGE POINT CONNECTIONSCondensers should be purged at pointsrecommended by the condenser manufacturer. Thisis typically at the top of each circuit’s outlet header.

In some cases a small, high-pressure auxiliary receiveris located at the outlet of one or more condensers.This receiver should have a purge point at the top.

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WATER LINEAn automatic water bubbler flush system is providedwith the purger (except Model AP01). A water linemust be connected to the water solenoid valve (#6).The connection is ½� FPT. The water supply pressureshould be 30–80 psig (3.1–6.5 bar).

The clear tube of the water bubbler may becomecoated with mineral deposits after a period of time.These deposits can be removed by adding a cup ofvinegar to the water in the bubbler and cleaning theclear tube through the top plastic fitting with thesupplied brush. A water conditioning filter housingand cartridge are available for abnormally hard water.

Model AP01 comes with a plastic hose and fittingfor connection to an ammonia-absorbing waterreservoir (customer supplied). This reservoir shouldbe at least one gallon (four liters) and the watermust be changed regularly. The water bubbler flushsystem can be added to Model AP01.

OIL DRAINSExcess oil can reduce the purger capacity by loweringthe evaporating or condensing rate. Oil is not typicallya problem. However, any oil that may collect in thepurger can be drained off through the two capped¼� valves on the purger. See Figure 1. Before drainingoil, shut-off the purger and close the liquid and foulgas valves. Allow the purger to pump out, then closethe suction line valve. Use normal oil drainingprecautions to prevent injury or property damage.

LIQUID LINEA high-pressure liquid source is required for theAUTO-PURGER. This connection should be at alocation where oil will not be directed into the purger.The liquid line supplies refrigerant during start-upand feeds makeup liquid as required during purging.The l iquid l ine solenoid valve (#1) on theAUTO-PURGER closes when the AUTO-PURGER isoff. See Figure 11. The supply pressure must besufficiently above the purger evaporator pressureto ensure proper operation of the level control valve.This valve supplies only 5% of the liquid refrigerantrequired for cooling, except at start-up. The remainderof the required refrigerant is condensed from thefoul gas line. This liquid is fed to the evaporatorthrough the metering valve located downstream ofthe liquid metering solenoid valve (#3).

Figure 2. Typical purge point locations.

CHECK VALVESThere are four check valves on the purger. A 1 psid(.07 bar) check valve with a 1/32� (.8 mm) diametermetering orifice is installed on the purge gas line toprevent reverse flow of water into the purger. A30 psid (2.1 bar) check valve is installed in the liquidline to the float chamber. This limits the liquid linepressure at the purger to 30 psi (2.1 bar) less thanthe foul gas pressure and allows noncondensiblesinto the purger. A 225 psid (15.5 bar) relief checkvalve from the float chamber to suction line. Olderpurgers have a 200 psid (13.8 bar) relief check valve.The water line has a ½�check valve.

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DRAIN LINEA 1 ²²²²² (25 mm) PVC socket/1 ²²²²² FPT water drainconnection is located at the bottom of the bubbler.The water should flow to a suitable drain or container.If the drain line is run overhead, the fitting on thetop of the water bubbler must be sealed, includingthe ¼ ²²²²² NPT vent connection in the fitting, and aprotective mesh installed around the clear tube. Donot run the line more than 10 ¢¢¢¢¢ (3 m) above the heightof the bubbler because the pressure on the waterbubbler could be excessive. Support the drain lineto prevent undue stress on the water bubbler. Also,do not install a shutoff valve in this line. SinceModel AP01 comes less the bubbler, no drain isnecessary on this model.

Initially, fill water bubbler with water through the 3 ²²²²²(75 mm) plug located on top of the tube. Keep theplug lubricated and hand tight. Check for leaks atthe hose fittings.

MODEL APF AUTO-PURGERSModel APF AUTO-PURGERs are for use in halocarbonrefrigeration systems. The installation and operationof these AUTO-PURGERs are similar to that of anammonia AUTO-PURGER.

PIPING HALOCARBON AUTO-PURGERSThe halocarbon liquid line and foul gas line pipingand sizing details are the same as for an ammoniaAUTO-PURGER. However, the suction line size forhalocarbon purgers should be 1 ²²²²² (25 mm) for suctiontemperatures down to –20°F (–29°C), and 1¼ ²²²²² (32mm) for –20°F (–29°C) to –60°F (–51°C) suctiontemperatures. Condenser drain lines on halocarbonevaporative condensers must be trapped and dropvertically 8 ¢¢¢¢¢–12¢ ¢ ¢ ¢ ¢ (2.5m–3.7m), or per manufacturerrecommendations. This is to prevent possiblebackflow of liquid into one or more condenser circuitsresulting in a flooded purge point.

While the air indicating column (water bubbler flushsystem) is included, the water line and drain lineare not required. Purge points are at the samelocations as for an ammonia purger. See Figure 2.For evaporative condensers, the purge points areon the top of the outlet drain l ine. Althoughnoncondensible gases are lighter than halocarbongas, they still collect at, or near, the outlet.

FILTER-DRYER CONDITIONING SYSTEMThe special construction for APF AUTO-PURGERsincludes a filter-dryer conditioning system for thefoul gas and liquid line. See Figure 3. Water vapor,as well as noncondensible gas, may be present ateach purge point. The filter-dryers remove thismoisture before it can enter the purger. Both dryersare used to protect the purger internally from freezingwater, but they also supplement water removal ofthe primary refrigeration system liquid line dryers.Moisture indicating sight glasses located downstreamof the filter-dryers indicate when the filter-dryer coresare saturated with water and must be replaced.Isolation shut-off valves are included for changeout of the filter-dryer cores, and access valves allowevacuation of the refrigerant from the filter-dryershell. Another feature is a small filter-dryer prior tothe liquid metering valve (or metering orifice onEuropean purgers). This small filter-dryer protectsthe expansion orifice by capturing particles and anymoisture present in the purger. It should be replacedduring normal maintenance.

AIR INDICATING COLUMNModel APF AUTO-PURGERs are equipped with anair indicating column (ammonia models have a waterbubbler). Fill the clear tube to the marked line withwater or a lightweight, clear oil. Noncondensiblesreleased from the purger bubble up through thecolumn, indicating proper operation. As with ammoniapurgers, the counter inside the control cabinet keepsa record of how many times the purge gas solenoidvalve (#5) opens to release noncondensibles intothe column.

Figure 3. AUTO-PURGER APF filter-dryer conditioning systemfor halocarbon refrigerants.

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ELECTRICAL CONNECTIONSThe standard AUTO-PURGER requires a 115V 50/60Hzelectrical supply. Also, AUTO-PURGERs requiring230V 50/60Hz are available. The circuit should befused to 15 amps. Model AP01 has a ½� (13 mm)knockout on the side of the control cabinet to accessthe power connection terminal strip. Any unusedknockout holes must be sealed to prevent splashingwater, dust, and debris from entering the controlcabinet.

AUTO-PURGERs other than Model AP01 have anadditional ¾� (20 mm) knockout for individual purgepoint solenoid valves. Wires from each purge pointsolenoid valve should be brought to the purger controlcabinet. Any additional access holes should be madeon the side of the control cabinet. All access holesinto the control cabinet must be sealed to preventmoisture, dust, and debris entering the cabinet.

Connect one line from each purge point solenoid tothe corresponding screw terminal located near thetop inside the control cabinet. The numbers on theterminal strip correspond to the numbers on thelights located on the door of the control cabinet.Connect the remaining wire from each purge pointsolenoid to the ground terminal inside the controlcabinet.

Remote purge point solenoid valves must be thesame voltage as the purger. An internal transformerprovides 12V DC to the electronic control circuitsand the door panel wiring. This transformer normallydoes not need to be serviced.

PURGE GAS SOLENOID VALVE TIMEDELAY CUTOUTThe AUTO-PURGER is equipped with a one hourfixed-time-delay relay which controls the purge gassolenoid valve (#5). This valve meters noncondensiblegases to the water bubbler when the purger isoperating. See Figure 11. This relay closes the purgegas solenoid valve (#5) after one hour of continuousnoncondensible gas release into the water bubbler.In the unlikely event of a float switch malfunction,electrical fault, or system malfunction, this preventsexcess amounts of refrigerant being released.However, during start-up of a new purger or underhigh noncondensible removal conditions, it issometimes advantageous for the purge gas solenoidvalve (#5) to remain open continuously. The delayrelay is equipped with an on/off switch to bypassthe time delay function. Simply turn the relay toOFF until the high volume of noncondensible gas isremoved when. When noncondensible gas is beingremoved at short intervals, the time-delay relay shouldbe switched ON for normal operation.

If during normal operation the delay relay time isexceeded, the magnet will not make contact withthe float switch tube and gas will not be releasedinto the water bubbler. To reset the relay, turn theswitch to OFF and back to ON. This resets the delayrelay for another hour.

SETTING THE GRASSLIN TIME CLOCKA Grasslin Mil 72 Series time clock is used in theAUTO-PURGER since 2/98. To set the correct day,remove the transparent cover and rotate the outerdial until the day is aligned with the triangular markeron the inner dial. To set the time, rotate the minutehand clockwise until the time is correct. AM and PMare indicated on the outer dial. See Figure 4.

If running the purger continuously, push all clocktabs out or set the manual override switch out fromthe middle position (up or down). If the purger is torun intermittently, such as shutting down at nightor on the weekend, set the run time by pushing theclock tabs out for each period that the purger is tobe on. Make sure the manual override switch is in themiddle. Each tab represents two hours. Tabs pushedto the center represent when the purger is off.

For AUTO-PURGERs shipped before 2/98, adiscontinued Grasslin time clock was used. Thesehave red and green tabs. To set the time and day onthese clocks, rotate the minute hand on the circulardial. Once the correct day and time are set, theamount of run time per day must be determined andset. Set the ON time using the green tabs and theOFF time using the red tabs. Use a green tab andred tab for each day of the week. To run the purger24 hours per day, pull all the red pins from thecircular dial or turn the small knob in the upper-right corner of the time clock to the on position.

The purger should not operate when the refrigerationcompressors are stopped. Terminal connections areprovided for an interlock to shut down the purgerwhile the Grasslin Time Clock continues to operate.

SECTION 2 ELECTRICAL INSTALLATION &MECHANICAL COMPONENT OPERATION

Figure 4. Grasslin Time Clock,Mil 72 Series. (Hansen Part# 20-2226)

Manualoverride switch

Clock tabsOut = OnIn = Off

MANUAL PURGE POINT OPERATIONThere is a switch on the front panel of the controlcabinet (except AP01) to manually select the currentpurge point, and to turn the purger to AUTOMATICand OFF. If it is desired to purge from only onepoint, turn the switch to that purge point. The purgerwill go through automatic start-up with the switch ineither the AUTOMATIC or MANUAL position. However,air must be present for the purger to purge.

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OPERATION OF THE METERING VALVENote: European AUTO-PURGERs do not have ametering valve. Instead, a metering orifice is used.See the next section.

The metering valve meters condensed l iquidrefrigerant from the high-pressure side of the purgerinto its flooded evaporator. The flow to the meteringvalve, part number 20-1714, is controlled by the ¼�liquid metering solenoid valve (#3). This valve isenergized when the purger is in AUTOMATIC orMANUAL operation. The refrigerant is filtered througha small flanged strainer prior to the metering valve,which removes any particles that might block theorifice.

An indication of proper operation of the meteringvalve is a frosted liquid feed line from the floatswitch chamber through the solenoid valve, strainer,and metering valve to the evaporator. If the stainlesssteel line is not frosted when the purger is inAUTOMATIC or MANUAL operation, then the flow ofrefrigerant through the line may be blocked due todirt in the metering valve, strainer, or solenoid valve.

The metering valve is set and held in place by alocking knob. Unlock this knob using the .035� hexkey wrench provided inside the purger control cabinet.To clean the orifice of the metering valve, fully openthe metering valve to flush out any particles. Then,close the valve and reopen six turns. This is theproper operating setting for both the ammonia andhalocarbon metering valve. On halocarbon purgersshipped prior to 1/91, the metering valve setting is 2turns open. These older valves are easily recognizedby their green metering knobs.

If the line still does not frost, check the liquid meteringsolenoid valve (#3) for operation. If the solenoidvalve appears to be operating normally, then pumpout the purger and inspect the solenoid, strainer,and metering valve.

OPERATION OF THE METERING ORIFICEON EUROPEAN AUTO-PURGERSThe metering orifice meters condensed liquidrefrigerant from the high-pressure side of the purgerinto its flooded evaporator. The flow to the meteringorifice, part number 70-0213, is controlled by the ¼�liquid metering solenoid valve (#3). This valve isenergized when the purger is in AUTOMATIC orMANUAL operation. The refrigerant is filtered througha small flanged strainer prior to the metering orificewhich removes any particles that might block theorifice.

An indication of proper operation of the meteringorifice is a frosted liquid feed line from the floatswitch chamber through the solenoid valve, strainer,and metering orifice to the evaporator. If the stainlesssteel line is not frosted when the purger is in theAUTOMATIC or MANUAL operation, then the flow ofrefrigerant through the line may be blocked due todirt across the orifice or in the strainer or solenoidvalve.

OPERATION OF COUNTERThe counter inside the control cabinet displays thenumber of times the purge gas solenoid valve (#5)opens. This valve bleeds noncondensibles into thewater bubbler. The counter does not monitor theduration of the purge time, only the number of timesthe purger has been emptied of air.

The counter can be used to measure noncondensiblegas activity. If a daily or weekly record is logged,any abnormal changes in the number of times thepurge gas solenoid valve (#5) is operated can benoted. This directly relates to the amount ofnoncondensible gases released. An abnormalincrease may indicate a problem with the system,such as a leak. An abnormal decrease in the operationof the purge gas solenoid valve (#5) may indicate aproblem with the purger. In either case, action canbe taken to correct the problem.

Resetting the counter to zeroOn 115V AP purgers, the counter has a push-buttonreset. In order for the counter to reset, the purgermust be OFF. When the purger is off, push the knobon the face of the counter to reset to zero.

On 230V AP purgers, the counter has a thumb wheelreset. The purger can be either ON or OFF. To resetthe counter, simply turn the thumb wheel until thecounter displays zero. See Figure 5.

LEAK TESTUse standard refrigeration procedures to check theAUTO-PURGER for leaks before placing it in service.To confirm a leak-free AUTO-PURGER, manually openthe foul gas solenoid valve (#4) on the purger byremoving the lower seal cap and turning the stem in(clockwise). Next, manually open one remote purgepoint solenoid valve, if there is one. Manually openthe foul gas shut-off valve and allow pressure insidethe purger to build to condensing pressure, as shownon the pressure gauge. Then, turn the foul gas valveoff. Turn the purger switch on the front panel toAUTOMATIC. This opens the vent solenoid valve(#2) and pressurizes the evaporator section of thepurger. Check for leaks. Return all solenoid manual-opening stems to the automatic position.

Figure 5. Resetting the purge gassolenoid valve counter.

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SETTING PURGE POINT TIMEREach purge point timer board contains eight relayswhich energize the remote purge point solenoidvalves. These relays operate in sequence when theAUTO-PURGER is set to AUTOMATIC PURGING. Wirethe remote purge point solenoids in sequence. Donot skip any purge point terminals.

The amount of time each purge point relay is activecan be adjusted from 1 to 60 minutes. To adjust thetime, rotate the screw on the timer clockwise toincrease or counterclockwise to decrease. The screwrotates approximately 270° with a linear time increase/decrease with rotation. See Figure 6. These are factoryset at approximately 1 minute.

When on AUTOMATIC PURGING, the purge sequencebegins at purge point #1, continues to purge point#2, and so on. When the final purge point is completed,the timer circuit returns to purge point #1 and repeatsthe sequence. This continues as long as the purgerfront panel switch is set to the AUTOMATIC position.

The Jumper Select connector indicates the final purgepoint. See Figure 7a. In Figure 7a, only six of eightpurge points are desired. With the Jumper Selectconnector installed as shown, the purge pointsequence returns from purge point #6 to purge point#1 and repeats the purge cycle, omitting purge points#7 and #8. To change the final purge point, simplymove the Jumper Select connector to the numberedpins corresponding to the final purge point. All purgepoints up to and including the one where the JumperSelect connecter is installed are included in thesequence. All purge points after the one where theJumper Select connecter is installed are omittedfrom the sequence. See Figure 8. If changing the

Figure 6. Setting the purge point timer. Figure 7a. AP08 purge point timer board.

number of purge points is expected, keep this inmind when wiring the added purge point solenoids.

Model AP08 has one purge point timer board. ModelAP16 has two purge point timer boards electronicallytied together. Model AP24 has three purge pointtimer boards electronically tied together. For modelsAP16 and AP24, jumpers A and B are used toelectronically tie the purge point timer boardstogether. On Model AP08, the jumpers remain inboth the A and B positions.

On Models AP16 and AP24, jumper A is located onthe final timer board to return the purge pointsequence to the initial timer board. Jumper B islocated on the initial timer board. When jumper Areturns the sequence to the initial timer board, jumperB resets the solid state electronics to the beginningof the sequence. The purge timer boards automaticallycascade from one board to the next board. Therefore,the middle board on an AP24 (points 9 through 16)has neither the A nor B jumper installed. See Figure7b and 7c.

If the number of active purge points is decreased sothat one or more of the purge point timer boards arenot used, move jumper A to the last board in thesequence. This may also be the initial board. Installthe Jumper Select connector on the pinscorresponding to the purge point that is the last inthe sequence. Also, disconnect the timer cable, partnumber 20-1349, from the unused timer board(s).

By temporarily disabling one or more purge pointtimer boards, in effect an AP24 becomes an AP16 orAP08 and an AP16 becomes an AP08. This may beuseful when planning for future system expansion.

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Figure 8. Changing the final purge point.

Figure 7c. AP24 purge point timer boards.Figure 7b. AP16 purge point timer boards.

These purge pointswill be energized inthe purge sequence.

These purge points willbe omitted from thepurge sequence.

These purge pointswill be energized inthe purge sequence.

These purge points willbe omitted from thepurge sequence.

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START-UPMake sure all piping, electrical connections, andsettings are complete as described in this bulletin.Open the foul gas, liquid, and suction line shut-offvalves. Open the purge gas gauge valve and watershut-off valve. On Models AP08, AP16, and AP24,turn the purger switch located on the front panel ofthe control cabinet to the AUTOMATIC position. Besure the Grasslin 7-Day Time Clock is ON.

The AUTO-PURGER begins with a COOL DOWN stage.The PURGER COOLING DOWN light illuminated onthe front panel indicates correct operation. This stagecools the purger to a temperature where efficientseparation of noncondensible gas and refrigerantcan occur. The AUTO-PURGER will not condensenor allow any foul gas into the water bubbler untilthe temperature of the purger evaporator reachesapproximately 20°F (–7°C). This should take 5 to 15minutes, depending on suction line temperature.

PURGER PUMP OUT PROCEDURE, WITHAUTO-PURGER ON1) Close the purge gas gauge valve to the water bubbler.2) Close the liquid line shut-off valve.3) Close the foul gas line shut-off valve.4) Close the water line valve.The purger will pump down in several hours. Toaccelerate the process, attach ammonia hoses tothe oil drain valves and pump out into a suctionline. Close the suction line to isolate the purger.With electricity on, the pressure in the purger shouldremain at zero. This process should be completedonly by knowledgeable refrigeration technicians.

LIQUID DRAINERThe liquid drainer separates any liquid condensedin the purge point piping. This liquid is fed into thepurger’s flooded evaporator. Therefore, only foulgas—no liquid—enters the condensing section ofthe purger. However, if too much liquid comes downthe foul gas line due to improper piping, correctiveaction must be taken. Too much liquid is indicatedby continuous frost on the stainless steel line runningfrom the outlet of the liquid drainer into the purger’sflooded evaporator. During normal operation, thisline should frost and defrost as small amounts ofliquid are released into the flooded evaporator. Ifthe line is continuously frosted, one or more purgepoints are flooded with liquid.

WATER BUBBLERModels AP08, AP16, AP24, and APC AUTO-PURGERsare equipped with a water bubbler. Noncondensiblegas from the AUTO-PURGER flows through the waterbubbler where residual ammonia is absorbed intowater. The water, with absorbed ammonia, flows toa drain. The water solenoid valve (#6) opens toautomatically replenish water to the bubbler eachtime the purge gas solenoid valve (#5) energizes.The water solenoid valve (#6) remains energized for30 seconds after the purge gas solenoid valve (#5)de-energizes (float switch magnet pulls in). Small,1� (25 mm) diameter bubbles in the water bubblerindicate proper operation.

OPERATION OF PURGE GAS ORIFICEPurgers shipped after January 3, 1989 incorporate ametering orifice disc inside the 1 psid (0.07 bar)check valve in the purge gas line to the water bubbler.See Figure 9. This 1/32� (0.8 mm) diameter orificemeters the noncondensible gas into the water bubblerto prevent over or under feeding. The ¼� NPT gaugevalve should be fully open during operation andclosed for pump out or maintenance. The orifice issized to remove approximately 2 ft3 (0.06 m3) ofnoncondensible gas per minute.

Purgers shipped prior to 1989 use the gauge valve,set at 1/8 turn open, as an orifice to bleed adequatenoncondensibles to the water bubbler. More than 1/8turn open causes excessive action.

OPERATION OF LEVEL CONTROL VALVEThe purpose of the level control valve is to maintainthe liquid level in the evaporator chamber. Duringstart-up, the liquid line solenoid valve (#1) energizesto feed liquid refrigerant to the level control valve,which feeds the purger until the level in the floodedevaporator reaches the level of the sensor. Duringoperation of the purger, the level control valve actsas a makeup device to maintain the liquid level.However, approximately 95% of the liquid used inthe evaporator is liquid condensed from the foulgas line and recirculated through the liquid linemetering valve.

Figure 9. The purge gas solenoid valve (#5).

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Figure 10. Ladder diagram for AUTO-PURGER AP operation. Also, refer to the wiringschematic supplied with the purger for the purger control cabinet.

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The AUTO-PURGER is designed to automatically start-up and operate without the assistance of plantpersonnel. Beginning at start-up, the following is adescription of the refrigerant flow through a purgerwhen all connecting shut-off valves are open. Referto Figure 11.

START-UPOn start-up, the AUTO-PURGER enters a COOLINGDOWN stage. In this stage, liquid refrigerant fillsand cools the purger. Both the flooded evaporatorand high-pressure air separator chamber are filledsimultaneously. The liquid line solenoid valve (#1)energizes to feed refrigerant to the liquid level controlvalve, which opens to fill the low-pressure floodedevaporator. The liquid level sensor located in thesuction separator chamber senses when the floodedevaporator is full and closes the liquid level controlvalve.

At the same time the flooded evaporator is filling,liquid refrigerant fills the float ball chamber and theair separator chamber through the liquid line andthe 30 psid (2.1 bar) check valve. The refrigerantgas that is formed is vented to suction through thevent solenoid valve (#2). When the float switchchamber fills with liquid refrigerant, the float ballrises and pulls in the float switch magnet, de-energizing the vent solenoid valve (#2).

The purger continues to cool down. A thermostatwith a sensor bulb attached to the flooded evaporatorsenses temperature. At approximately 20°F (–7°C)evaporator temperature, the thermostat switches thepurger from the COOLING DOWN stage to AUTOMATICor MANUAL, as indicated by the purger switch andlights on the control cabinet.

OPERATIONWhen the purger is in AUTOMATIC operation, thefoul gas solenoid valve (#4) and liquid meteringsolenoid valve (#3) are energized, allowing a mixtureof noncondensible gas and refrigerant into the purger.In addition, the thermostat energizes the timer boardto operate the first purge point solenoid valve. Thethermostat also allows solenoid valves (#5) and (#6)to open when the float ball is down (magnet awayfrom tube).

If the switch on the front panel of the control cabinetis set to MANUAL (single purge point), then thatpurge point solenoid valve energizes. The purgerpurges only from that point as long as the switch ispositioned to that purge point.

The foul gas carries a certain amount of condensedrefrigerant, which is captured by the liquid drainerbefore it enters the purger’s condenser coil. Fromthe liquid drainer, the liquid is fed directly into theflooded evaporator chamber. If this separation doesnot occur, liquid refrigerant will fill the purger’scondenser and limit the condensing capacity of thepurger.

The liquid-free foul gas enters the purger condensingcoil, which is submerged in the flooded evaporator.The refrigerant condenses inside the coil. Thecondensed refrigerant and noncondensible gas thenflow through a check valve and back into the airseparator chamber. The condensed liquid refrigerantis removed from the high-pressure air separatorchamber through the liquid metering solenoid valve(#3), strainer, metering valve (located in the liquidfeed line), and then into the flooded evaporator.Note: European purgers have a metering orificeinstead of the metering valve.

Meanwhile, the noncondensible gas travels alongthe top of the air separator chamber and into thefloat ball chamber where it collects. As morenoncondensible gases collect, the liquid levelgradually falls, causing the float ball to fall. Thischanges the SPDT switch position of the liquid levelfloat switch and energizes the purge gas solenoidvalve (#5) and the water solenoid valve (#6), allowingnoncondensible gas to bleed through the orificeplate into the water bubbler (except Model AP01).As air is released into the water bubbler, the liquidrefrigerant level in the purger float ball chamber rises.

The purger timer board operates each specifiedremote purge point solenoid valve in sequence, aslong as the purger switch on the front control cabinetis on AUTOMATIC and the 7-day time clock is on.See the Setting Purge Point Timer section on page 8for details.

WATER BUBBLER FLUSH SYSTEMThe water flush system consists of the water bubbler,water solenoid valve (#6), water check valve, andshut-off valve. This is an option that can be addedto the AP01. Water is automatically fed to the waterbubbler through the water solenoid valve (#6).Noncondensible gas and water mix, absorbingresidual amounts of ammonia into the water. Theammonia-laden water is flushed to the drain throughthe overflow tube. The water solenoid valve (#6)remains energized an additional 30 seconds afterthe float switch magnet pulls in. This fills the waterbubbler with fresh water for the next purge cycle.

SECTION 3 AUTO-PURGER OPERATION

13

Figure 11. AUTO-PURGER AP flow diagram.

Solenoids: #1 Liquid Line#2 Vent#3 Liquid Metering

#4 Foul Gas#5 Purge Gas#6 Water

14

SECTION 4 TROUBLESHOOTING PURGER OPERATION

ProblemNoncondensibles are not beingreleased from the purger

REASON 1The 30 psid (2.1 bar) check valve is stuck open.CHECKClose the liquid line shut-off valve. The pressure gaugeon the purger should read close to system condensingpressure and should not change when the liquid line isclosed. Leave the foul gas line open. Next, open theliquid line shut-off valve and close the foul gas line.The pressure should drop 20–30 psi (1.4–2.1 bar). If not,the 30 psid (2.1 bar) check valve is stuck open.ACTIONPump out the purger and clean or replace the 30 psid(2.1 bar) check valve (20-1184).

REASON 2The relief check valve is leaking or stuck open.CHECKLook for frost on the check valve. If operating properly,there should be no frost.ACTIONReplace or repair the check valve.

REASON 3The vent solenoid valve (#2) is leaking or stuck open.CHECKLook for frost on the outlet of the solenoid valve. Ifoperating properly, there should be no frost.ACTIONRepair or replace the solenoid valve.

REASON 4The metering orifice in the 1 psid (0.07 bar) check valveinside the purge gas solenoid valve (#5) is plugged. SeeFigure 9.CHECKMake sure the purge gas solenoid valve (#5) isenergized, then look for noncondensible gas release.ACTIONIf noncondensibles are not released, then clean orreplace the 1 psid (0.07 bar) check valve (20-1183).

REASON 5The foul gas line is not open.SYMPTOMThe pressure gauge on the purger is reading 20–30 psi(1.4–2.1 bar) below system condensing pressure.CHECKClose the foul gas line shut-off valve. If the reading onthe purger pressure gauge falls 20–30 psi (1.4–2.1 bar),the foul gas line was open. If the pressure remains thesame, then:ACTIONCheck for individual purge point solenoids notenergized or stuck closed. Check for closed shut-offvalves. Verify proper operation of the foul gas solenoidvalve (#4). To check for a sticking solenoid valve, usethe manual-opening stem to temporarily open the valve.Observe if the pressure increases to condensingpressure. Also, ensure that the plastic shipping cap hasbeen removed from the foul gas line flange.

REASON 6The time-delay relay time limit has been exceeded.

SYMPTOMThe magnet on the float switch is away from the steeltube, the water solenoid is energized, and theNONCONDENSIBLE GASES TO ATMOSPHERE light isilluminated.CHECKVerify that the one hour time delay limit for the purgegas solenoid valve (#5) has been exceeded.ACTIONTurn the delay relay off momentarily to reset the timedelay. For more information see Section 2, Purge GasSolenoid Valve Time Delay Cutout.

REASON 7No noncondensibles are present in the system.CHECKCompare the refrigerant liquid temperature from thecondenser with the condensing pressure. The pressure/temperature relationship should be within 2 to 3 psi(0.14 to 0.21 bar) to indicate no noncondensiblespresent.

REASON 8The liquid feed line is plugged.SYMPTOMThe purger appears to be operating properly, but theliquid feed line is not frostedCHECKLook for a restriction in the metering valve (meteringorifice on European purgers).ACTIONUnlock the metering valve knob using the .035�hex key wrench provided inside control cabinet. Openthe valve wide to clear any dirt plugging the orifice.Close the metering valve and reopen 6 turns (2 turnsfor halocarbon purgers shipped prior to 1/91; thesehave a green knob).CHECKMake sure the liquid line solenoid valve (#3) isenergized and frosted.ACTIONNo frost means the strainer or line is plugged.Disassembled and remove the blockage. See PurgerPump Out Procedure on page 10.

REASON 9The foul gas line is flooded with liquid.SYMPTOMThe stainless steel line from the bottom of the liquiddrainer to the inlet of the purger evaporator is alwaysfrosted. During proper operation, this line shouldperiodically frost and defrost.CHECKRefer to Piping Instructions in Section 1.

REASON 10The liquid line pressure at the purger is 20 psi (1.4 bar)or more higher than the condensing pressure.

15

CHECKVerify the pressure at the liquid line and the foul gasline using pressure gauges. Check for a high statichead of liquid and/or a pump boosted liquid linepressure.ACTIONFor a high static head, install a pressure reducingdifferential pressure regulator (Hansen’s HA2BL)in the liquid line. For a pump boosted liquid line,install the liquid line before the pump.

REASON 11The purge point solenoid coil is shorted.SYMPTOMThe 2 amp (1 amp on 230V purgers) fuse is blown.Do not increase the amperage of the fuse.CHECKVerify the resistance in each coil to find theshorted coil.QUICK CHECKReplace the blown fuse. Advance purge pointswith the advance button until the new fuse blows.The faulty coil or wiring is now pinpointed.ACTIONReplace the faulty coil or repair the wiring. Install anew fuse.

ProblemAmmonia instead of noncondensiblesreleased from the purger

SYMPTOMSmall bubbles are present in the water bubbler andthe water bubbler assembly is violently shaking.REASON 1The foul gas line is not open.SYMPTOMThe pressure gauge on the purger is not readingwithin 2–5 psi (0.14–0.34 bar) of system condensingpressure.CHECKClose the foul gas line shut-off valve. The pressureshould fall 20–30 psi (1.4–2.1 bar), as indicated onthe pressure gauge on the purger.ACTIONCheck for a blown 2 amp fuse (1 amp for 230Vpurger) in the control cabinet. This indicates aburned out purge point solenoid coil. Next, check fora closed valve and a plugged strainer in the foul gasline. Ensure that the plastic shipping cap has beenremoved from the foul gas line flange.

REASON 2The purge gas solenoid valve (#5) seat is leaking.SYMPTOMBubbles are slowly being released in the waterbubbler with the NONCONDENSIBLE GASES TOATMOSPHERE light not illuminated and the floatswitch magnet pulled in against tube.CHECKLook for dirt or a worn seat in the purge gassolenoid valve (#5).ACTIONLift the float switch assembly momentarily to openthe valve. This may clear any dirt on the seat. If not,pump out the purger and repair the valve.

REASON 3Oil in the purger.SYMPTOMNo frost is present around the bottom oil drainvalve. Normally, liquid is present here and thevalve frosts.ACTIONDrain any oil through the valves located on thebottom and left end of the purger, as described inthe Oil Drains section on page 4 of this bulletin.

REASON 4The relief check valve is leaking or stuck open.CHECKLook for frost on the check valve. If operatingproperly, no frost should be present.ACTIONRepair or replace the check valve.

REASON 5The vent solenoid valve (#2) is leaking or stuckopen.CHECKLook for frost on the outlet of the solenoid valve. Ifoperating properly, there should be no frost.ACTIONRepair or replace the solenoid valve.

REASON 6The liquid level control valve is not operating.SYMPTOMThe suction line and the outlet flange of the liquidlevel control valve are not frosted.CHECKVerify the resistance of the heater. Properresistance of the 115V heater is 900 ohms, for the230V heater 3,600 ohms, both ±10%.ACTIONReplace the heater if the circuit is open.CHECKThe power element charge may be lost. Check thecapillary tube for breaks.ACTIONReplace the power element. The purger must beisolated from the refrigeration system and thepurger pumped out before replacing the powerelement. Follow the pump out procedure describedon page 10.

REASON 7The foul gas solenoid valve (#4) is not open.SYMPTOMThe foul gas line is frosted or cold where the lineenters the insulated purger vessel.CHECKVerify the voltage to foul gas solenoid coil (#4) atterminal 32.CHECKManually open the foul gas solenoid valve (#4). Thepressure should rise 20–30 psi (1.4–2.1 bar), asindicated on the pressure gauge on the purger.ACTIONIf the pressure does not rise, pump out the purgerand clean or replace the foul gas solenoid valve (#4).

16

ProblemPurger does not switch from PURGERCOOLING DOWN to AUTOMATIC orMANUAL PURGING

REASON 1The suction temperature is above 20°F (–7°C).CHECKVerify the suction temperature at the purger suctionline connection.ACTIONIf not cold enough, move the suction line to lowertemperature suction, or reset the thermostat to ahigher temperature. Call the factory beforechanging the thermostat setting.

REASON 2The evaporator is not filled with refrigerant.CHECKThe float switch magnet should make contact in 5 to15 minutes after turning the purger on.ACTIONIf the magnet does not pull in, check for a restrictionat the liquid line shut-off valve, verify voltage at theliquid line solenoid valve (#1) (115V at terminal 28or 230V for 230V purger), verify continuity of theliquid line solenoid coil, check for a blockage in theliquid line strainer, and ensure that the plasticshipping cap has been removed from the liquid lineflange.

REASON 3The liquid level control is not working.CHECKVerify frost at the outlet flange of the liquid levelcontrol valve. If no frost is present, check for 115Vat terminal 35 (or 230V for 230V purger). Checkcontinuity of the heater. Proper resistance of 115V

ProblemPurge point solenoid valve is notoperating properly

REASON 1Solenoid valve faulty.CHECKVerify coil is operation or look for dirt in the valve.

REASON 2No voltage to the timer board.SYMPTOMThe red LED on the timer board is not illuminated.CHECKVerify 12V DC on cable 20-1197 leading from thepurger board. The white wire is neutral and theblack and gray wires should have 12V DC when thepurger is in the AUTO position.ACTIONRepair the cable. If 12V DC is present, go to thenext CHECK step.CHECKIf cable 20-1197 is OK, check for 12V DC at terminal4 on the door panel. Terminal 7 on door is neutral.ACTIONIf no voltage is present, check wire 4 for continuityand repair if necessary.

REASON 3A fault in the timer board cable 20-1196.SYMPTOMIn AUTOMATIC, the purge point lights do not operatebut the purge point solenoids are operating.CHECKVerify the continuity of each lead from the timercable, 20-1196.ACTIONRepair the fault.

REASON 4A fault in the purger board to timer board cable20-1197.SYMPTOMIn AUTOMATIC, either all purge point lights aredimly illuminated or no lights are illuminated.

REASON 8A purge point or purge point solenoid is notconnected.SYMPTOMFoul gas pressure is being lost.CHECKExamine the physical connections to each purgepoint. Verify proper wiring to the purge solenoidvalve remote line connections in the controlcabinet. Verify continuity of all wiring to coils.ACTIONProperly install the purge point. Refer to PurgePoint Connections in Section 1. Properly connectthe purge point solenoid. Refer to ElectricalConnections in Section 2.

REASON 9Float switch is not properly installed.CHECKCheck to see if float switch is positioned properly.(Refer to mounting instructions.) Loosen retainingscrew and lift float switch and remove any iceaccumulation that may have pushed float switch up.ACTIONPosition float switch assembly on neck of theenclosing tube and tighten retaining screw suchthat the screw tip is in the grove of the neckassembly.

heater is 900 ohms, 3600 ohms for the 230Vheater, both ±10%. Check for broken or pinchedcapillary tube.ACTIONReplace the power element 20-1441 (115V) if thecapillary tube is damaged. Replace the heater if theresistance is incorrect (115V heater, 20-1752; 230Vheater, 20-1753).

REASON 4A restriction in the suction pressure.CHECKVerify the line size and shut-off valves. The suctionline should be a minimum of ¾� (20 mm) forammonia and 1� (25 mm) for halocarbons. On newinstallations, ensure the plastic shipping cap hasbeen removed from the suction line flange.ACTIONRemove restriction or install the correct line size.

17

ProblemControl cabinet appears to have nopower (does not enter COOLING DOWNwhen switched on)

REASON 1No power to the purger.SYMPTOMThe ON and PURGER COOLING DOWN lights arenot illuminated.CHECKThe LINE and NEUTRAL terminals inside the controlcabinet should have 115V (230V for 230V purger)across the terminals.

REASON 2The 7-Day timer is not on.CHECKVerify the time setting on the timer.ACTIONSet the time according to the instructions on page 6of this bulletin.

REASON 3No power to the purger board 20-1773.SYMPTOMThe red LED on the purger board is not illuminated.CHECKVerify voltage to the board. The voltage betweenterminals RL and COMMON should be 115V (230Vfor 230V purger).REASON 4A fault in the wiring to the purger board.CHECKVerify continuity between leads 36, 37, 39, and 46.ACTIONRepair if defective.

REASON 5The transformer is faulty.SYMPTOMThe red LED on the purger board is not illuminatedbut there is power at terminal RL.CHECKVerify 24V AC between leads 43 and 44.ACTIONIf no voltage between the leads, replace thetransformer. If voltage is present, go to reason 6.

REASON 6A short in the 12V DC circuit.SYMPTOMThe red LED on the purger board 20-1773 is notilluminated if there is a short. On purgers shippedbetween 7/88 and 11/91, the purger board has abuilt-in fuse. If the fuse is blown, replace it aftercompleting the following CHECK step.CHECKDisconnect purger cables 20-1195 and 20-1197, andterminal plug connections 22 through 26. The redLED should now be illuminated.ACTIONIf the LED does not illuminate, replace the purgerboard 20-1773. If the LED illuminates, plug in eachcable separately until the red LED goes out todetermine which circuit has a ground short.

REASON 7A fault in the purger cable 20-1195.SYMPTOMThe ON light not illuminated but the red LED onpurger board is illuminated.CHECKVerify 12V DC between terminal 1 and terminal 7(neutral) on the door.ACTIONIf no voltage between the terminals, check thecontinuity of cable 20-1195 and repair. If voltage ispresent, go to reason 8.

REASON 8A faulty rotary switch (purger switch).SYMPTOMLook for no voltage at door terminal 2 when therotary switch is set to the AUTOMATIC position.ACTIONIf no voltage is present, check wiring leads 1 and2, and the rotary switch for faults. If voltage ispresent, go to reason 9.

REASON 9A fault in the purger cable 20-1195.SYMPTOMThe ON light and red LED on the purger board areilluminated but the purger is not operating.CHECKVerify the voltage between lead 2 and neutral on thepurger cable 20-1195.ACTIONIf no voltage is present, then replace the purgercable 20-1195. If voltage to the purger boardthrough lead 2 on the door panel is 12V DC, thenthere is a fault on the purger board. Replace thepurger board 20-1773.

ProblemWater bubbler develops excessivemineral coating

REASONHard water in the water bubbler.ACTIONSwitch the water line to softened water or install theoptional water conditioning housing and cartridge.

CHECKVerify the continuity of each lead.ACTIONRepair the fault.

REASON 5A purge point solenoid valve is not operating.CHECKVerify continuity through the two amp fuse (oneamp for 230V purger).ACTIONIf faulty, replace the fuse.CHECKVerify the voltage at terminal RL. The voltageshould be 115V (230V for 230V purger). If novoltage is present, check the continuity of lead 42.

18

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Parts List

PURGE POINT SOLENOID VALVESFor the customer-supplied purge point solenoidvalves, Hansen recommends our HS8 with close-coupled strainer. This is a 1/2� port, heavy-duty,pilot-operated solenoid valve with stainless steelpiston. The purge point solenoid valve must be aminimum of 1/2� port size to avoid excess pressuredrop across the valve.

HS8ST ½� Solenoid Valve with Close-Coupled Strainer

HS8ST ½� Solenoid Valve with DIN PlugConnection and Close-Coupled Strainer

The standard molded coil is for 115V, 208/230V, or24V. Flange connections available are 1/2�, 3/4�, and3/8� FPT, socket weld, and weld neck. Also availableis 5/8� ODS. To order, specify catalog number HS8ST,required connection style and size, and volts. SpecifyDIN plug solenoid connection if needed.

19

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Parts List

Replacement control cabinets are available for both standard(US) and European purgers. Contact the factory for selection.

20

HANSEN TECHNOLOGIESCORPORATION6827 High Grove BoulevardBurr Ridge, Illinois 60527 U.S.A.Telephone: (630) 325-1565Toll-free: 1-800-426-7368FAX: (630) 325-1572© 2003 Hansen Technologies Corporation Printed in USA

CAUTIONHansen purgers are for refrigeration systems only.These instructions and related safety precautionsmust be read completely and understood beforeselecting, using, or servicing these purgers. Onlyknowledgeable, trained refrigeration techniciansshould install, operate, or service these purgers.Stated temperature and pressure limits should notbe exceeded. Purger components should not beremoved from the purger unless the system hasbeen evacuated to zero pressure. See also the SafetyPrecautions in the current List Price schedule andthe Safety Precautions Sheet supplied with thisproduct. Escaping refrigerant can cause injury,especially to the eyes and lungs.

WARRANTYElectrical and electronic components are guaranteedagainst defective materials and workmanship for 90days F.O.B. our plant. All other components areguaranteed against defective materials orworkmanship for one year F.O.B. our plant. Noconsequential damages or field labor is included.

DEFINITIONSNoncondensible gases: These gases, primarily air, cannotbe condensed by the normal system operating temperature andpressure. They cause higher-than-necessary head pressure.Noncondensible gases can enter a refrigeration system throughvacuum leaks, break down of oil and refrigerant, and duringservice repairs and system charging.Foul gas: A vapor mixture of noncondensible gases andrefrigerant gas.High-pressure liquid: Refrigerant liquid source from acondenser or receiver.P-trap: A piping arrangement, typically in condenser drainlines, to prevent passage of gas while enabling liquid to proceed.Purge point: A location on the refrigeration system above theliquid level where foul gas is taken from and piped to the purger.Purge gas: The noncondensible result of the separation ofrefrigerant gas from the foul gas by the purger. Normally passedinto a water bubbler or water reservoir.

SELECTING AN AUTO-PURGER®

In addition to the AUTO-PURGER® AP, HansenTechnologies offers two other versions—the compactAUTO-PURGER® APM and the NonelectricalAUTO-PURGER® (NEAP). Use the followingdescriptions to help select the best AUTO-PURGERfor your needs. For additional assistance, contactthe factory.

AUTO-PURGER APThis is the original AUTO-PURGER. It has solid-state control and is ideal for larger systems, up to1500 tons (5300 kW) ammonia. This is two to threetimes the air removal capacity of the Armstrongpurger. With models available to purge up to 24points, the AP features automatic start-up withelectronic control. The purge cycles can beindividually adjusted to meet system requirements.The AP includes an automaticwater bubbler. An optionalNEMA 4 rated enclosure isavailable. A European option isavailable that features all-weldedconstruction and conformance toEuropean electrical standards.For ammonia and halocarbonrefrigeration systems.Assembled, tested, and ready torun.

AUTO-PURGER APMA more compact version of the original AP, theAUTO-PURGER APM is ideal for medium-size systems,up to 200 tons (700 kW). Like the AP,the APM features automatic start-upwith electronic control. Designed forup to four purge points, an electronic“brain” searches for noncondensiblegases in the system and purges atthose points when air is present. TheAPM includes an automatic waterbubbler and comes standard with aNEMA 12,13 control cabinet. For usewith ammonia refrigeration systems.Assembled, tested, and ready to run.

NONELECTRICAL AUTO-PURGER (NEAP)The Nonelectrical AUTO-PURGER (NEAP) is idealfor small systems, up to 100 tons (350 kW). Thenonelectrical design also makes the NEAP ideal forexplosion proof applications. The simple design ofthe NEAP features easy start-up and is generallyused to purge a single point. For use with ammoniarefrigeration systems. Assembled, tested, and readyto run.

STANDARD (US) AUTO-PURGER APCONSTRUCTION VERSUS EUROPEANAUTO-PURGER APE CONSTRUCTIONThe standard (US) AP and European APE operate inthe same manner, except as noted in this bulletin.The basic differences in construction between thetwo versions are outlined in the chart below.

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