OEM Maintenance Docs 1.pdf

TNATIE'

Maintenance

This section contains maintenance information for the Steam or Hot- Water Absorption Chiller.

Table of Contents Maintenance . Daily . Horizon - Absorption Operating Log . Seasonal . Cooling Season Prestart Reminders . Extended Shutdown . Seasonal Start-Up Unit Vacuum

Check . Shutdown Machine Vacuum Chart

Machine Checkout . General . lnspection Frequency

Recommendations . Machine lnspection Frequency

Recommendations . Service Frequency

Recommendations . Service Frequency

Recommendations . Water Treatment . System Chilled Water (Evaporator)

Circuit

Cond€nser and Absorber Tube Care

Cleaning the Condenser Water Circuit . Tube Cleaning Arrangement . Tube and Water-box Liquid Volumes

Water Passes

Water-Box Cover Bolting Requi.ements . Bolt Torque Requirements

Cooling-Tower Temperature Control . Control . Typical Cooling-Tower Control . Typical Machine Piping and lnstrumentation

Tube Support Locations . General . Tube Support Locations and

Dimensions

Pump Operational Csre and Maintenance . Operation . Pump Maintenance . Pump lnspection ltems Periodic Purqe Maintenancs . Purifier Purge . Purge Vacuum Pump and Motor

Assembly . Drive Belt Checkout and Adjustment . Oil Replacement . Oil Filling

Solution Maintenance

AFD Maintenance . Self Diagnostics . AFD Component Checks and

Corrective Action

ABS.M ] 18 13

Daily Maintenance To ensure reliable, sale. and efficient operation, the following items should be checked daily as routine maintenance. This will avoid unnoticed problems that could lead to downtime, and provides daily data that can highlight trends, locating potential problems before they occur:

'1. Record and review operating data.

Use the operating log tound on the next page and log the points suggested.

Familiarization with the daily log temperatures and other items allows the operator to identify when a change occurs, possibly indicating an abnormal condition.

Review the daily operating history with the service personnel as necessary, or at the next inspection. (Verify temperatures and pressure gauges for operation.)

2. Make sure the machine is operating properly. Cycle the machine on and ofl periodically to make sure it starts and stops properly. This allows safety devices to sequence through a start-up to confirm operation.

3. Check the cooling tower for correct waler lrealment, and for machine inlet temperature and flow. Check system chilled water (Evaporator Circuit). Check water tlow pressure drop daily. Clean strainers yearlv.

The owner should engage the services of a qualified water treatment specialist to obtain the treatment needed to control tube fouling and maintain machine efficiency. Untreated or improperly treated water will reduce machine efflciency. and i, the chemical balance of the water is not controlled, may necessitate extensive tube cleaning or possible tube replacement.

4. Note: Always allow the chiller to complete a dilution cycle before disconnecting the chillet power source, 74 ABS M 118

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Horizon - Absorption Operating Log

Serial Number Date - lvlonth WeekMachine Model Number

Item

Job Name

Ste

En rda

Evaporator

Absorber/Condenser Pressure

IN

N n Tlme

Solution r Tem lTem Ent *lt4ixed Sol

*LTG Lv So Conc

SDR Tri Tem at Cond R Terr

Absorber E

SolTem

Tem

Sol

SolTem En

B Tem

E L

Abs Ent

L erL

Generator

X

H

Wateri E avin Tem to Cmd %

%AFD A

Ene

Suction

Im

Chiller Avera

Sundav Thursdav Fridav

AM AIV PM AM PM

ABS,M.11B

Out Tlme R

TII T r_-f--T-- T TI T__l f T_--f-T_-f_lr I TI I

T__l IT ] ffi r ft--r-r ltt T-T--r-f rtT--f__l ----r--r

I r-T--T_-T-T__l T__l IT ] I r IIr T__l T f T IIT__T__]

T---T-l T- II ] rrt I f T-T- f--T--rT--r-r f T -f_-l f l T T---t--T_- f--T--fffiT---r--[-r--r-l ITr f-T_- I]r ffi ffi -lt1--r

T--r--I TT T--r-f--T-ffiffi m ttt ++---r-m ffi

Seasonal Maintenance Cooling Season Pr6liminary Reminders The following items should be checked before seasonal start-up.

Contact your local Trane seryice representative to perform the service,

1. Check the unit vacuum. After extended shutdown, check the actual unit internal vacuum to determine if purging is required before the unit can be safely started. See unit vacuum checkout.

The maximum internal pressure is dependent on the machine temperature, lf purging is required.

follow purging instructions (purge section).

2. Determine the purge pump condition. Run the pump and verify performance. Check the ultimate pressure performance, and change the oil or repair the pump if required.

3. Prepare the machine for cooling.

Fill the condenser/absorber, vent the air from the condenser water-boxes. Venting will remove air from within the piping and avoid nuisance trips of the condenser flow-switch input.

4. Check all the piping connections for possible water leakage. Check the absorber, condenser. and evaporator water piping. Ensure that any off-season work and reassembly is complete,

5. Check the pressure drop across the chiller evaporator and condenser sections. Compare to unit design conditions.

6. Visually inspect the electrical system. Look ,or signs of any alterations performed since the last operational season. and verify that the wiring is intact. Clean AFDS of dust and grime.

7. Confirm that the chilled/hot water pump, cooling water pump. and cooling tower are interlocked.

Check the f ield proof-of-operation interlocking wiring for the chilled-water flow, and for condenser-water flow.

L Determine the electrical condition of the pump and motor contaclors.

9. Test-run the unit. Check machine control sequence.

10. Purge the machine of noncondensibles. Check the purge rate after the machine is started.

Keep the machine fire-rate reduced until the purge rate diminishes during unit operation.

1'l.Log the unit-operating data. Check temperatures and pressures throughout the fluid cycle. Check that the LTSB HTSe ASP, and RP ampere draw and voltages are normal and not excessive.

12,|t is recommended that all tubes be tested periodically by a qualif ied, nondestructive tube testing service, This testing will confirm tube condition and identify potential problems in water-treatment.

Extended Shutdown Drain the water circuits (evaporator and condenser/absorber) completely, and blow out all water from the tubes and water-boxes.

lvlain power must remain applied to the unit to allow automatic purging.

Seasonal Start-Up Unit Vacuum Check Start-up after an extended shutdown should not be attempted until the unit vacuum is measured and compared with Chart 1. Any combination of temperature and pressure that falls on or below the line of Chart 1 indicates a safe condition. The unit purging is required before start-up if the measured vacuum is above the acceptable limit.

Check the unit internal vacuum at the absorber service valve located on the side ofthe absorber shell. This valve is above the liquid level in the chiller.

A8S M 114

@ nexe e TRATIE'

Chart 1 - Shutdown Machine Vacuum Chart

MM Hg Gauge

.06 €(x) 100 -

.670 90

-690 70

.70 -700 60

.71 -710 50

-72 -720 ()

-73 -730 30

.71 -7it0 20-

.75 .750 r0.

-76 760 0

Maximum Internal Pressure for Sale Machine Start

20 ,0 a0 to ao ,0 t0 x too Machine Temperaturo "F

!20

Pressure MM HgCM Hs

Gauge

-$7

{E

{0

-680 rro

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II

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ABS M 1]B 77

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Machine Checkout General To ensure machine reliability, safety and efficiency, routine maintenance of the chiller and control system are required.

During servicing, always operate the chiller from the unit local control panel. Always allow the chiller to complete a dilution cycle before disconnecting the power. Reler to the sequence of operation for dilution cycle details (located in the controls section).

CAUTION

Always turn off the electrical power supply(sl before undertaking any maintenance that does not require machine operation.

N4achine inspections should be performed periodically. Some inspection is recommended every three months, whereas others are at six-month and/or 12-month intervals.

lnspeqtion Frequency Recommendations Chart 2 illustrates machine-related inspection items and the appropriate frequency of inspection. Performing the maintenance at the intervals suggested will provide the basis lor machine reliability.

When appropriate, contact your local Trane service representative. Follow component manufacturer recommendations in all cases, and check local codes for any additional regulations that may be required.

Selvice Frequency Recommendations Chart 2 identities important machine service intervals. These recommendations may vary when unusual machine-room conditions exist.

System Chillod.Water (Evaporator) Cilcuit and Wator Treatment It is recommended that the owner engage the services of a qualitied water treatment specialist to test and recommend any treatment necessary to control water contamination.

THE TRANE COMPANY ASSUMES

NO RESPONSIBILITY FOR

EOUIPMENT FAILURE RESULTING

FROM UNTREATED OR IMPROPERLY

TBEATED WATER.

It is further recommended that all tubes be tested periodically by a qualif ied-nondestructive tube-testing service. This testing will confirm tube condition and identify potential problems.

Check water-flow pressure drop daily.

Clean strainers yearly.

The system water circuit is a closed circuit and normally will not accumulate an appreciable amount o, sludge or scale. lf cleaning should be required, use the same method outlined for the cooling water circuit.

18 ABS M.118

e TRATIE'

Chart 2 - Machine lnspection ahd SeNice Recommendations Machine lnsp€ction ltems For the following machrne il6ms, refer to the applicable section in this manual and/or contact a Tran€ servi;e technician

Operator Maintenance

Dailv 6 Month Service o x X X x Beview purqe hislory X Purqe SYstem Maint€nance Check belr lension/condilion x X Check belt alionment, clean v belt

X x (note 1)

Check purae performance uitimate Dressure x X PumD cleanino Wflushino oil x X suction and conn€ctions x XX X Check motor and l!bncate x X Overhau ouroe oumo Clean p!roe condensinq unit coil X {note 1) Absorber/Cond€nser:

Monilorwater lreatment Check water flowpressure droo X x x x X Clean tubes (brush and chemicat) x X Eddv current test tubes Clean pipino strainers (note 3)

Check water flodpressure drop X X X X x

Clean rubes (brush and chemicat) X {noie 1) X

Clean DiDinq strainers (note 3) G€ne.ator: Inot€ 6) Check steam pressure al flanqe X x X C €an slrarners/traps (note 3) x x X (note 1) ndensate float draine x X (note 2) Solution

5,000 hr operation lnhibitor adi!stmenl Additive adiustment x Sleam/hot warer valves (Check O X X Machine access valves (Diaohraqms X X 15,000 hr va ve iD x x 15,000 hr Refriqerant dumo valve (Check ODeration X X ControlSystem Check Sequence of Operatron Safeties settinos and functi X x x (note 2) Wirinq connections x x Check AFDs for cleanlinea; X x {note 2)

{note 2)

50,000 hr Rotor/stator (inspect) 50,000 hr

ABS M I1B

50,000 hr

Note 1 Frequency dep6nds on conditions Nole 2 - See manufacture r€commendataon Nole 3 - Clean after firsl two w€6ks ol operataon then yearly or as otherwis€ determined necessary Not8 4 - Per solulion analysis r6sults Note 5 Use a qualified wat€r troatm€nt company and rollow thsir recommendations to insur€ proper w6tertreatment.

Not€ 6 - High Temp Gensralor lub€s are 400 series srainless st6el. Eddy curent inspection will not det€ct tub€ deficiencies.

TNAflE'

Condenser and Absorber Tube Care lnternal fouling of the condenser and absorber tubes will seriously reduce their ability to transfer heat to the cooling water The resulting higher temperature and pressure have several undesirable effects:

1. The refrigerant condensing capability of the condenser is reduced.

2. The absorber saturation pressure is increased because the solution is not cooled.

3. The higher condenser saturation temperature may cause the formation of hydrogen gas, which must be purged from the absorber.

Two methods for cleaning the tubes afe.

1. Mechanical

2. Chemical

The mechanical method is used to remove sludge and loose material from the tubes. Access to the tubes is obtained by removing the absorber and condenser water headers. To loosen the material, work a nylon or brass bristle brush through the tubes (a brass brush is recommended).

After the material has been loosened, flush the tubes with clear water.

Scale deposits are best removed by chemical means. The tower water circuit is constructed of copper, steel and cupronickel.

Figure 24 illustrates a typical chemical-cleaning hookup. The cleaning hookup is made to pipe fittings installed in the absorber supply and condenser return piping.

Figure 24- lube Cleaning Afiangemont

Shutoff

Circulator Pump

All materials used in the external circulation system, quantity of solution, duration of cleaning period and any required safety precautions should be approved by the company furnishing the materials or performing the cleaning. Table 6lists the liquid volume (in gallons) of the tubes and water-boxes.

Table 6 - lube and Wate.-Box Liguid Volumat lcallons) Tube and WaterBox Volumes

(US Garlons Unil Size EvaDorator Absorber/Condenser

850 360 596 950 388 535 r050 416 674 1150 713 1200 592 971 1350 635 r030 1500 679 1090 1650 122 I149 t

I

:ttt iL o

Cleaning Solution

ABS M 118

NOTE: To ensure reliable and efficient machine operation, the cooling water must be properly treated. The Trane Company assumes no responsibility fot equipment failurc resulting from untreated or imprope y treated water.

Cleaning the Tower Water Circuit Check the water-flow pressure drop daily. Clean strainers yearly or as conditions require.

The water available for cooling frequently contains minerals that will form a carbonate scale on the walls of the tower water circuit. Cooling towers collect roreign material that will deposit in the tubes and limit machine efficiency. At a minimum, the condenser and absorber tubes should be brushed after each cooling season.

To ensure maximum efficiency, the cooling. water circuit must be kept free of both sludge and scale. Even a very thin coating of scale will greatly decrease the heat-transfer capacity of the absorber and condenser bundles.

The condenser tubes should be inspected once a year to determine if mechanical cleaning is required, and if the water treatment is effective, il ll

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TRANE'

Water Passes ABTF 850 through 1 150 nominal tonnage machines have two waterside passes in the evaporatot condenser, and absorber Refer to order writeup for specials.

Water-Box Cover Bolting Requirements (Refer to Table 7)

To ensure gasket sealing. the bolting procedure of covers must be as follows:

. Use anti-seize compound on all bolts before installing water-box covers.

. lnsert and snug up the first 6 to 10 bolts toward the centerline of each cover. Ensure the cover is Ilat against the mating surface and that the bolts are slightly more than finger-tight.

.Ighten the bolts starting from the center at the top and bottom o, each cover, and working outward to the corners.

lable 7 - Bolt Torque Requirements Bolt Size (in.) To.que (ft Ib)

Cooling-Tower Temperature Control Control

1. Cooling-tower water temperatures must be maintained at or above 58"F for reliable operation. Control panel logic circuits allow start-up at temperatures well below the design selection temperature, and will protect against unsafe conditions.

2. To avoid the oscillatory effects of tower water fluctuations being influenced by the leaving chilled-water temperature, entering tower-water temperature control should be kept constant.

Any time that the tower water entering temperature is at or below design, the potential for "low cooling entering water temperature limit" exists. The chiller load and the actual temperature of the water determine the likelihood of seeing this limit, which actively limits machine capacity. The further away Irom design that the water temperature deviates the more limiting potential that exists, This control system logic feature is built in to ensure continued machine operation and machine reliability, and to control the potential for salt carryover and/or crystallization.

The maximum rate o, tower temperature change must be kept to a minimum. lnherent problems with larger tower water fluctuations are:

. First, the potential to drop the leaving water temperature to the chiller's "differential-to-stop" set point.

. Second, fluctuations can cause a crystal lization detection-and-recovery cycle to be entered, this cycle lasts approximately l1 minutes, after which the chiller will restart and proceed to reestablish chilled-water temperature control.

. lnefficient operation because the margin cannot be monitored.

Table 8 provides "Typical Cooling Tower Control" operation.

Table 8 - Typical Cooling Tower Control System I Opeation for cooling Recommendations for cooling tower fan thermostat calibrat on.

Fan Oft 78'F 78'F 81'F On 84'F 82'F 86'F

Senins lqqrer4q€ LEan No-1 ryo.2

A cooling tower bypass is recommended Ior stable control of the chilled water circuit. See Figure

System 2 Operation for low load and winter lncorporate a thre€-way valve- Start and slop the cooling towor fan based upon the following fan thermostal temperalure of 78'F to 84"E

5/16 15 4A

7t16 52

5/8 160 3/4 295

Note: General bolt torque requirements lor grcde 5 zinc-plated, coarse-threaded bolts ate tisted above.

A8S M 11B 81

Figute 25 - Typical Machine Piping and lnstrufientation

2 8 6 1

3 4

I

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13 t34

Flow switchss (B ) By othsrs

Figure Notos:

'1. Expansion Tank

2. Air Vent Valve

3. Absorption Machine

4. Stop Valve

5. Pressure Gauge

6. Thermometer

7. Tower Bypass

8. Cooling Tower

9. Temperature Controller

10. Sump

11. Condenser Water Pump

12. Stop Valves tor Chemical Cleaning

13. Drain Valve

14. Chilled-Water Pump

I a2 ABS M-t 1a

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]r e TRANE'

Tube Support Locations General Fixed tube suppons located in the evaporatot absorbet and condenser are illustrated in Figures 26 and 27.

The generator is designed with both fixed and tloating tube supports as identified in Figure 27. The tube support quantity is determined by machine size. This information will assist when performing eddy-current tube testing.

Left Hand End

Exampte: To measure the tube suppott location in inches, start from the left-hand end (tubeshee callout "A' and select the desired tube support (see callout letters "B" through "V"l, The tables in Figurcs 26 and 27 provide the total length in inches frcm the left-hand end (tubesheet) callout "A."

Note: Dimensions are measured from the center ol each tube support. Each tube suppott is %" in width.

Figure 26 - Evaporator/Absofuer Tube Suppott Locations lot Uttit Sizes 85O - 1650 (Dimensiont in lnch$)

A

C E c J L N R T

Righl Hand End

Bighl Hand End

Right Hand End

Right-Hand End

II

Right-Hand

End

Dimensions in lnches Size E G J L N T

850 47 112 100 3/4 142 1/2 190 231 112

950 94 143 1/A 222 1/4 261 112

41 94 95 114 142 3/4 1901/4 237 g4 285112

188 226 314 271 118 309 112 lgll Lefi-Hand1150 End1200 Relerence 1g!L Poinr "A"

88 ',tl8 132118 1761/8 22O 1B 264 39 5/8

72 6tA

19 1/8 108 7/8 1451/8 141 3/a 21/ 5tA 2537n 290 I18 5/8 1581/8 197 5i 8 n7 18 2765/A 316

381/8 16118 I14 1/8 1521t4 1901/8 2241/8 2661/8 304 1/8 342

ABS M-118

@ nax, Figurc 27 - Geneotor/Condenset Tube Suppon Locations fot Unit Sizes E50 - 1650 (Dimensions in lnches)

Fixed Tube Supporl c E G J L N R

D K P

Floaling Tube Suppon

T

HF M S U

ILeft'Hand End

Oimensions in lnches (Used with Fiqute 271

RighaHand End

Right.Hand End

Righl- Hand End

Rishl'Hand End

Size B c D G H K 850 23314 47 112 711/4 95 1143t4 1421t2 1661t4 ',t90 213314 950 235t8 41 114 17 t14 1O7 1/4 130 3/4 154114 184 X 214114 237 718

B1B 41 314 11 't/2 95 t/4 119 142314 166 l/2 190 1/4 214.1!!L rert+ano1150 End1200 Reference

23 112 17 't07 130 7la 154314 178 5t8 202',t12 232',t/2 22 441r8 66 t/8 a8 1/a 1101/8 132 118 1541/8 176 t/8 1981A

.!3EL Point "A" 1a1B 3637a 541/2 72518 90314 10A1/a 127 14511A 163'tl4 1500 197/a 39 5/8 59 3/8 791/a 9A7B 1185/8 138 3/8 158r/8 1777/8 1650 191/8 381/8 57 1,4 761/8 95 1/8 1141/8 1331/8 152 r/8 171 1E

Size L M N u s T U

850 231 112

950 261 1t2 1050 LBft Hand

End .139L aeterence

231 261 2851 262 1t2 286 309 1/2

2201]a 242 1E 1350 Po\nr"A" 14138 199112 2't15la 2!E34 2537/a 272 290 1500 197 sta 217 3ts 237 18 25618 276 5/A 296 3/8 316 r650 1901/8 209 1/8 228',lt8 247 1B 266 t/8 285 r/8 304 1/8 3231t8 342 a4 ABS M 114

B

Risht'Hand End

Pump Operational Care and Maintenance Opelation First-time operation - on initial operation or after installation or overhaul, perform the following checks before putting the unit back into operation. 8e sure that the pump is completely filled with liquid. Run the unit for only a few seconds to make sure it operates smoothly.

There should be no unusual vibration, grinding, or scraping noises.

CAUTION

Do not run this unit dry. Even momentary operation without the pump and motor casing filled with liquid will damage bearings, lf the pump trips on overload current, perform the following checks:

a. Note the discharge pressure with the pump running.

b. Stop the motot but do not close or adjust the valves.

c. Disconnect all power

d. Reverse any two line leads at the motor starter to reverse the direction of rotation.

e. Start the motor and note the discharge pressure. The direction of rotation that provides the higher discharge pressure is the correct rotation.

Pump Maintenance The solution pump should be disassembled and inspected at routine intervals. The need to inspect and/or service the pumps is expected to be very intrequent, The expected interval between start-up and the first pans replacement is approximately 50,000 hours of normal operation.

This assumes that proper solution analysis and maintenance is performed. High amounts ot suspended solids may reduce the design life. Parts should be replaced as determined by a qualified Trane Service Technician.

Since the interval between inspection and repair is quite extended, it is logical to replace the wearing comPonents to a like new condition anytime that the pumps are opened.

Therefore pump parts should be orde.ed and on hand anytime the pumps are opened. Table 9 indicates items that should be inspected and the action to be taken whenever the pumps are opened. For cutaway view of the pump, see Figure 23.

Table I - PumD lnspection ltems

Ealance Remove Material to Balance Clearance 006/.009'Nominal ace if two Tlmes Nominal

X ace with New Motor irculalioo Passaqes Clean Motor Lead lnsulation

Orv Out in Oven Check fo. Cracks,^ruear

ABS,M.] 1B 85

TRATIE"

Periodic Purge Maintenance The following information describes the maintenance requirements of the purge system. To ensure efficient and reliable machine operation. perform all inspections and procedures at the prescribed intervals. Keep a record of all inspection results to establish proper service intervals, and to document changes that occur in purge activity which could alter chiller performance.

Purifier Purgo The following sections describe the required periodic maintenance:

Weekly While the purge system is operating, check the purge tank condensing activity by observing the liquid level in the sump sight glass. The liquid level should be visible in the sight glass during the condensing unit operation.

Semi-Annually lnspect the air-cooled condensing unit coil; clean as needed. Clean the coil from the fan side, using compressed air or a coil cleaner. A fouled coil will reduce purge efficiency and capacity, AWARNING

Certain p.ocedures common to relrigeration system service may expose operating and/or servicing personnel to liquid and/or vaporous refligerant. To avoid iniury or death due to skin exposure oi inhalation of refrigerant, closely lollow all safety procedures described in the material safety data sheet and on all labels on refrigerant containers.

Only csrtitiod sGrvice personnel should service the refrigerant system.

To avoid iniury or death due to electrical shock, never open access panels to inspect or service the unit without first opening all the disconnect switches.

Us9 caution when working on certain areas of this unit. Surlace temperatures may exceed 150"F on the condensing unit. Contact with bare skin could result in burns and iniuries.

Do not touch tho bolt while it is rotating.

AWARNING

Belt tension maintonanco is important. An sdiustmont that is too tight or too loose can cause damage to the shaft bearings. An adiustment that is too looss allows the belt to slip, and shortefl th6 lifotime of the belt.

1. Check the pulley alignment and V belt tension. The belt should depress about 1/2" lo 314" undet light hand pressure applied midway between the pulleys. Belt adjustments are made by loosening the motor hold-down bolts, and sliding the motor toward or away Irom the vacuum pump as required.

2. To compensate for stretch due to break-in, adjust the tension of the belt one week after unit operation .

3. The adjustment of the belt tension should be made by parallel shifting of the motor. I rghten adiusting nuts or bolts securely after adjustments.

4. It required, clean the purge drive belts with an approved belt cleaner.

Periodic Checking Check the tollowing points periodically:

1) Check the bolts and nuts to make sure they are tight.

2) Check the gas ballast valve and solenoid valve to see that they are operable.

3) Check for leakage of oil from the shaft seal or the pump casing.

4) Replace the vacuum pump oil periodically to maintain pump performance. Check the oil turbidity through the oil level

Oil Replacement Replace the oil when the ultimate pressure oJ the pump itself is unsatisfactory or when the oil becomes too dirty, Although the oil becomes somewhat dirty during operation, the pump can be operated as long as an adequate suction vacuum is obtained.

Oil Replacement Replace the oil using the following procedures:

1. Warm the oil by operating the pump for approximately 15 minutes with the intake closed.

Stop the purge operation from the operator setting group menu. Open the drain oil cock, and drain almost all the oil. Most ol the oil will drain out freely.

AWARNING

Do not touch the belt while it is rotating.

The small residue of oil remaining in the pump can be forced out by turning the pump pulley by hand, with the exhaust port closed, and the intake open. The oil will spurt out suddenly. and should be deflected into the drain pan. Avoid extensive operation with the exhaust port sealed; excessive internal pressure may loosen the shaft seal.

AWARNING

Use extreme care. The oil will bo hot and can cause sgvere burns.

86 ABS M 114

Purge Vacuum Pump and Motol Assembly

Drive Belt Checkout and Adjustment

A WARNING

e nAile

Oil Filling

2. After removing all of the oil, close the drain and pour three or lour ounces of clean Duo-Seal oil into the intake port. Open the exhaust pon and run the pump for a short period to completely circulate the new oil. Drain the oil and force out the residue as above. Repeat the flushing process with new Duo- Seal oil until flushing remains clean and free of color and foreign matter. One or two flushings normally clean accumulated residue and protect the pump.

Operate the pump and check the ultimate vacuum that is achievable.

3. Repeat steps 1 and 2 several times if the pump does not perform.

4. Replace the dust cap. Start the purge pump with the manual hand valve closed and allow it to operate for one hour to warm the oil.

Recheck the oil level with the oil at operating temperature.

Becommended Oil Welch Duo Seal Oil, Oil-1

Once a Year Lubricate the purge pump motor with a good grade of machine oil.

Solution Maintenance To maintain machine efficiency, the lithium bromide solution must be analyzed periodically to determine if the inhibitor levels are within acceptable limits. A laboratory test is required to determine the inhibitor level {and other additive levels}, and any necessary adjustments. To maintain the correct levels, additive and inhibitor must be added periodically to the lithium bromide solution. lt is recommended that the solution be analyzed once a year if the machine is used for comfort cooling. and twice a year if it is used for continuous or critical cooling.

(Monitor the elapsed time meter and submit this when lithium bromide analysis is perlormed.) Contact your local Trane Service Agency for qualified laboratory testing.

Air leaks will accelerate inhibitor depletion resulting in excessive hydrogen production. Because absorption machines are unable to cool effectively when excessive hydrogen is formed, machine operation under these conditions is not recommended until the leak is elim inated.

Note: This machine uses lithium brcmide inhibited with lithium molybdate and lithium hydroxide.

Lithium brcmide that contains other inhibitorc cannot be used in this equipment.

ABS I\,4,118 81

E,RANE

AFD Maintenance Self-Diagnostics The AFD control provides drive information. Abnormal AFD fault conditions are displayed to identify the fault condition. Periodically inspect the AFD, as described in Table 10, to prevent accidents and to ensure high performance reliability.

To prevent electrical shock, disconnect all power before servicing the inverter and then wait at least five minutes after the power supply is disconnected and all LEDS are extinguished.

Table 10 - AFD Conponent Checks and Coftective Action Check

ExternalT6rminals, Connectors, Mounting Screws, Loose screws o. connectors Securelytighten

Heat Sink Buildup of dusl and dirt pressurel. lf dust and oil cannot be removed, replace rhe board

Printed Circuit Eoard {PCB) Accumulation ol conductive dust or oil Blow wilh dry compressed air I39.2x10! to 58.ax10 Pa i4 to 6 kg cm,) pressurel. lf dusl and oil cannot be removed, replace the board.

For abnornal noise and vibralio^ Power Components Accumulalion of dust and dirt wilh dry, comprossod ai. [39 2x10r lo lf dust and o I cannot be remove Smoothing Discoloranon or odor Roplace the capactor orthe AFD

88 aBs-M-11A