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Table 1: Operation analysis chart

Results

Possible cause

Remedy

Pre-rotation vanes

fail to open.

Check the

pre-rotation

vane motor

positioning

circuit.

High chilled water temperature.

System overload.

Be sure the

vanes are wide

open (without

overloading the

motor) until the

load decreases.

4. Symptom: No oil pressure when

SYSTEM START

button pressed

Oil pump running

in wrong direction.

Check rotation

of oil pump

(Electrical

Connections).

Low oil pressure displayed on control center; compressor

will not start.

Oil pump not

running.

Troubleshoot

electrical

problem with oil

pump VSD.

5. Symptom: Unusually high oil pressure develops when oil pump runs
Unusually high oil pressure is displayed when the oil

pressure display key is pressed when the oil pump is

running.

High oil pressure.

Transducer

defective.

Replace low or

high oil pressure

transducer.

6. Symptom: Oil pump vibrates or is noisy

Oil not reaching

pump suction

inlet in sufficient

quantity.

Check oil level.

Oil pump vibrates or is extremely noisy with some oil

pressure when pressing

OIL PRESSURE

display key.

Note:

When oil pump is run without an oil supply it

will vibrate and become extremely noisy.

Worn or failed oil

pump.

Repair or replace

oil pump.

7. Symptom: Reduced oil pump capacity

Excessive end

clearance pump.

Other worn pump

parts.

Inspect and

replace worn

parts.

Oil pump pumping capacity.

Partially blocked

oil supply inlet.

Check oil inlet for

blockage.

8. Symptom: Oil pressure gradually decreases (Noted by Observation of Daily Log Sheets)
When oil pump VSD frequency increases to 55 + hz to

maintain target oil pressure.

Oil filter is dirty.

Change oil filter.

9. Symptom: Oil pressure system ceases to return an oil or refrigerant sample

Model YK Style G R-134a or R-513A

Содержание York OptiView YK G Series

Страница 1: ...O1 621 Supersedes 160 75 O1 820 Operations and Maintenance Issue Date 2021 06 05 Model YK Style G R 134a or R 513A with OptiView Control Center for Electromechanical Starter Solid State Starter and Va...

Страница 2: ...2 Model YK Style G R 134a or R 513A...

Страница 3: ...ter temperature control 15 Operating log sheet 15 Operating inspections 16 Need for maintenance or service 17 Stopping the system 18 Prolonged shutdown 18 System components description 19 General 19 C...

Страница 4: ...34 Checking the refrigerant charge during unit shutdown 35 Handling refrigerant for dismantling and repairs 35 Megging the motor mechanical starter 36 Megging the motor VFD powered or solid state sof...

Страница 5: ...is expected that these individuals possess independent training that enables them to perform their assigned tasks correctly and safely It is essential that prior to performing any task on this equipm...

Страница 6: ...operating and service personnel to verify the applicability of these documents to the equipment If there is any question regarding the applicability of these documents rigging lifting and operating an...

Страница 7: ...mote Medium Voltage VSD 160 75 PW8 Renewal Parts Unit 160 75 RP1 Renewal Parts OptiView Control Center 160 54 RP1 Conditioned based maintenance Traditional chiller maintenance is based upon assumed an...

Страница 8: ...ting status temperatures pressures and other information pertinent to operation of the chiller are automatically displayed and read on a graphic display Other displays can be observed by pressing the...

Страница 9: ...nt which would be evaporated at full load design conditions However most systems are called upon to deliver full load capacity for only a relatively small part of the time the unit is in operation Cap...

Страница 10: ...Figure 3 Refrigerant flow through chiller falling film evaporator Model YK Style G R 134a or R 513A 10...

Страница 11: ...Figure 4 Refrigerant flow through chiller flooded evaporator 11 Model YK Style G R 134a or R 513A...

Страница 12: ...to 160 F 71 C If the target value is less than 110 F 43 3 C it defaults to 110 F 43 3 C To prevent overheating of the oil in the event of a control center component failure the oil heater thermostat 1...

Страница 13: ...he control center does not allow the chiller to start unless chilled liquid flow is established through the unit If the chilled liquid pump is wired to the microcomputer control center the pump starts...

Страница 14: ...utdowns Refer to Display Messages in the manual OptiView Control Center Operation and Maintenance Form 160 54 O1 Figure 7 Chiller starting sequence and shutdown sequence variable speed drive Note Not...

Страница 15: ...ooling sources other than evaporative air exchange methods such as wells bodies of water and chilled water The temperature control valve should be the type to open on increasing drive coolant temperat...

Страница 16: ...ance procedure the operator can avoid serious operating difficulty The following list of inspections and procedures should be used as a guide Figure 8 Liquid chiller log sheets Note These items can be...

Страница 17: ...ssary 1 Drain and replace the oil in the compressor oil sump See Oil charging procedure 2 Evaporator and condenser a Inspect and clean the water strainers b Inspect and clean the tubes as required c I...

Страница 18: ...n About this task If the chiller is to be shut down for an extended period of time for example over the winter season complete the following steps 1 Test all of the system joints for refrigerant leaks...

Страница 19: ...anes PRV modulate chiller capacity from 100 to as low as 15 of design for normal air conditioning applications Operation is by an external electric PRV actuator which automatically controls the vane p...

Страница 20: ...tem internally in the compressor It provides an oil supply to the various bearings and gears in the event of a system shutdown due to a power failure The reservoir located on the top of the compressor...

Страница 21: ...Figure 10 System components rear view 21 Model YK Style G R 134a or R 513A...

Страница 22: ...Figure 11 Schematic drawing YK compressor lubrication system Model YK Style G R 134a or R 513A 22...

Страница 23: ...ed type The evaporator is a shell and tube type with customer process fluid flowing inside the tubes and refrigerant removing heat on the shell side through evaporation Evaporator codes A to K utilize...

Страница 24: ...the vane motor end switch VMS opens when entering SYSTEM RUN if the actual level is less than the level setpoint a linearly increasing ramp is applied to the level setpoint This ramp causes the setpoi...

Страница 25: ...lled The starter enclosure is NEMA 1 with a hinged access door with lock and key Electrical lugs for incoming power wiring are provided Variable speed drive optional A variable speed drive can be fact...

Страница 26: ...o change the dehydrator use the following procedure 1 Isolate the dehydrator at the stop valves 2 Remove the dehydrator See Figure 12 3 Assemble the new filter drier 4 Open evaporator stop valve and c...

Страница 27: ...late See Figure 13 Do not tighten the connection at the charging valve until after the air is forced out by pumping a few strokes of the oil pump This fills the lines with oil and prevents air from be...

Страница 28: ...antity of water through the condenser to correct value 2 Symptom Abnormally low suction pressure Insufficient charge of refrigerant Check for leaks and charge refrigerant into system Temperature diffe...

Страница 29: ...il pressure Transducer defective Replace low or high oil pressure transducer 6 Symptom Oil pump vibrates or is noisy Oil not reaching pump suction inlet in sufficient quantity Check oil level Oil pump...

Страница 30: ...ing Jet or orifice of oil return jet clogged Remove jet inspect for dirt Remove dirt using solvent and replace 10 Symptom Oil pump fails to deliver oil pressure No oil pressure registers when pressing...

Страница 31: ...be used to detect any leaks too small to be found by the soap test To test with R 22 proceed as follows 1 With no pressure in the system charge R 22 gas into the system through the charging valve to...

Страница 32: ...0 00 50 000 101 28 9400 in 481 25 00 25 000 78 29 5300 in 192 10 00 10 000 52 29 6700 in 122 6 30 6 300 40 29 7200 in 099 5 00 5 000 35 29 8420 in 039 2 00 2 000 15 29 8820 in 019 1 00 1 000 1 29 901...

Страница 33: ...imits specified in Step 6 above the leak must be found and repaired Note Be sure the vacuum indicator is valved off while holding the system vacuum and be sure to open the valve between the vacuum ind...

Страница 34: ...isters this temperature or pressure it is a positive sign that the system is evacuated and dehydrated to the correct limit If this level cannot be reached it is evidence that there is a leak somewhere...

Страница 35: ...tem is shut down The refrigerant charge level must be checked after the pressure and temperature have equalized between the condenser and evaporator This would be expected to be 4 hours or more after...

Страница 36: ...with the starter at ambient temperature after 24 hours of idle standby Figure 16 Megging the motor windings mechanical starter Megging the motor VFD powered or solid state soft starter 1 Disconnect p...

Страница 37: ...the condenser and evaporator shells is important to provide trouble free operation of the chiller The water side of the tubes in the shell must be kept clean and free from scale Correct maintenance su...

Страница 38: ...evaporator can also contribute to erratic performance Condenser In a condenser trouble due to fouled tubes is usually indicated by a steady rise in head pressure over a period of time accompanied by a...

Страница 39: ...red the system the evaporator and condenser should be valved off from the rest of the water circuit and drained immediately to prevent severe rusting and corrosion The refrigerant system should then b...

Страница 40: ...king the operation of the oil return system and changing the dehydrator checking and changing the oil checking and changing the oil filters checking the operation of the oil heater checking the operat...

Страница 41: ...sis indicates there is no problem with the oil Compressor motor 1 Check the motor mounting screws frequently to insure tightness 2 Meg the motor windings annually to check for any deterioration of the...

Страница 42: ...y leaks found immediately Evaporator and condenser The major portion of the maintenance of the condenser and evaporator involves maintaining the water side of the condenser and evaporator in a clean c...

Страница 43: ...n the heating circuit is a treated closed loop Fouling could be detected as the ability to meet heat load requirements decreases Oil return system 1 Change the dehydrator in the oil return system semi...

Страница 44: ...mm Weight Pounds lb 0 4536 Kilograms kg Velocity Feet Second fps 0 3048 Meters Second m s Feet of Water ft 2 989 Kilopascals kPa Pressure Drop Pounds Square Inch psi 6 895 Kilopascals kPa Temperature...

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