McQuay PEH087 Operating And Maintenance Data
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McQuay PEH087 Operating And Maintenance Data

McQuay PEH087 Operating And Maintenance Data

Single compressor centrifugal chillers
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SINGLE COMPRESSOR CENTRIFUGAL CHILLERS
PEH/PHH 050,063,079,087,100,126
13600 Industrial Park Blvd.. P.O. Box 1551, Minneapolis, MN 55440

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  • Page 1 SINGLE COMPRESSOR CENTRIFUGAL CHILLERS PEH/PHH 050,063,079,087,100,126 13600 Industrial Park Blvd.. P.O. Box 1551, Minneapolis, MN 55440...

  • Page 2: Table Of Contents

    100 and 126 and provide a capacity range from 80 tons to system for operation at light cooling loads. This hot gas 1200 tons. The PEH050 is also applied with modified im- system is standard on PHH units and optional for PEH pellers and are designed as PEH046 or PEH048.

  • Page 3: Application

    APPLICATION The operation and maintenance procedures presented in this In the application of cooling towers with McQuay model manual apply to the standard model PEH chillers and the PEH centrifugal chillers, the towers are normally selected for model PHH heat recovery chillers. Reference to the installa-...

  • Page 4: Operating Sequence

    OPERATING SEQUENCE The single compressor PEH/PHH units can be operated as trol Module, loading and unloading the compressor to main- individual units or in multiples as dictated by the system tain the desired chilled water temperature. During all phases of operation, the critical functions of the design.
  • Page 5 TABLE 1. CONTROL COMPONENT SUMMARY - STANDARD APPLICATIONS RESET SIGNAL CONTROL SYMBOL SETTING LOCATION FUNCTION (Note 1) LIGHT Alarm Relay None Auto/Man Relay None Actuates circuit for remote alarm (where an AL relay is used, R9 Section signals opening of a water circuit interlock. Chiller Pump, CHWI None...

  • Page 6: Control Component Summary

    NOTE #2 This table contains all standard and most optional control components used in McQuay centrifugals. All listed controls are not necessarily used on all units Controls for specific units can be identified by referring to control diagram and/or the unit control center.

  • Page 7: Protective Controls

    PROTECTIVE CONTROLS The two most severe failures which can occur in a hermetic Each McQuay centrifugal is equipped with a complement of centrifugal compressor are surge conditions and motor safety controls to prevent the compressor from starting under failure. McQuay has developed highly reliable protective adverse conditions or to take the machine off-line when ab- systems to guard against both of these failures.

  • Page 8: Switch Section

    FIGURE 4. CONTROL CENTER FRONT PANEL NOTE: For other control panel configurations see IM 338. SWITCH SECTION (BEHIND PANEL) Legend High Discharge Temperature Switch Control Transformer 1. Operating Relays R1-R10 Low Pressure Switch Terminal Strip 2. Surgegard Relay Low Pressure Override Switch Control Module 3.

  • Page 9: Control Module

    Load/Unload RELAY SECTION The relay section is located behind the large left front door with the McQuay logo. This section contains the opsrating and safety relays and wiring terminal strip. Most relays are Water plug-in type and can easily be removed for servicing.

  • Page 10: Capacity Control System

    CAPACITY CONTROL SYSTEM are used to control the rate of bleed-off and consequently the The compressor capacity is controlled by the movement of “vane speed”. These needle valves are part of the 4-way the inlet vanes, opening or closing to permit the correct quan- tity of refrigerant to enter the wheel or impeller.

  • Page 11: Oil System

    Proper operation of the hydraulic system and bearing lubrication system can be assured only if McQuay recom- FIGURE 8. OIL FOR CENTRIFUGAL COMPRESSORS mended oil is used. For proper oil selection, consult Figure 8.

  • Page 12: Operating The Chiller

    Light load conditions are signaled by a thermostat (HGT) ditions. It also prevents surge during heat recovery operation. OPERATING THE CHILLER The initial startup of the McQuay centrifugal chillers after all PRELIMINARY CHECKS BEFORE STARTING installation is complete must be performed by a factory trained Prior to attempting to start the chiller, the operator should McQuay Service technician.

  • Page 13: Starting The Chiller

    be started and the COMP RUN light on the control panel Check oil sump by hand touch to see that oil heaters have will glow. been energized during the shutdown. Check position of all valves to assure valves are open. 5.

  • Page 14: Shutdown

    glow, if all other conditions are normal. the compressor will stop. The oil pump will continue operating for 60 seconds after Once the chilled water temperature has stabilized and the the compressor starter is de-energized to assure lubrication compressor is intermittently loading or unloading at less to compressor bearings during spin-down.

  • Page 15: Maintenance

    Only authorized and trained ser- vice personnel should attempt this service. For qualified CLEANING AND PRESERVING assistance, contact your local McQuay Service A common cause of service calls and equipment malfunc- technician. tion is dirt. This can be prevented with normal maintenance.

  • Page 16: Annualstartup

    Install Fusetrons in main disconnect switch (if removed). required-McQuay assumes no responsibility for the results of untreated or improperly treated water. Reconnect water lines and turn on supply water. Flush out condenser and check for leaks.

  • Page 17: Pressure Relief Valve Replacement

    At REFRIGERANT CHARGING less than full load, liquid subcooling will be proportionally less. The McQuay centrifugal chillers normally use R-12, or R-500 refrigerant; therefore, it is recommended that the operator PRESSURE RELIEF VALVE REPLACEMENT...

  • Page 18: Adjustments

    A.C. voltage signal which varies directly with thermometer. the compressor motor current. This signal is calibrated at the factory or by the McQuay 3. Switch the AUTO/MAN switch to AUTO position and quick- Service technician performing the initial startup of the chiller.

  • Page 19: Load Recycling Thermostat Setting

    LOAD RECYCLING THERMOSTAT SETTING at the end of the prelube cycle. During the initial startup procedure the McQuay Service Therefore, the setting needs to be as high as practical technician will set the LRT to control the compressor on and without causing a nuisance.
  • Page 20 MOTOR TEMPERATURE 1. Motor starter problem. 1. Measure motor winding 1. Contact McQuay Service. resistance. 2. Loss of refrigerant. 2. Leak test, check charge 2. Repair leak, add refrigerant. 3. Motor cooling feed problem 3.
  • Page 21 7a. Reset or recalibrate. b. Incomplete transition. b. Reset or repair starter 8 Power single phase. 8a. Compressor motor. 8a. Call McQuay Service. b. MCR failure b. Repair or replace. 1. The compressor starter has been 1a Starter and MCR relays 1 a.
  • Page 22 FIGURE 13 Continued. TROUBLESHOOTING GUIDE COMPRESSOR STARTER 1. Motor circuit problem. 1. Check continuity. 1 . Contact McQuay Service. OVERLOAD TRIPPED 2. Overload relay calibration. 2. Setting, dashpot o i l level. 2. Reset, add dashpot oil. 3. Current limit set too high 3a.
  • Page 23 FULL LOAD DESIGN CONDITIONS LOG SHEET CONDENSER CHILLER JOB NO. ~ PRESS. DROP PRESS. DROP CHILLER NO. LVG. TEMP. LVG. TEMP. Compressor F.L.A. ENT. TEMP. Condenser Pump F.L.A. ENT. TEMP. REFRIG. TEMP. ~ REFRIG. TEMP. Chiller Pump F.L.A.

  • Page 24: Mcquay Service Programs

    McQUAY SERVICE PROGRAMS It is important that an air conditioning system receive ade- Most popular among these services is the McQuay Com- quate maintenance if the full equipment life and full system prehensive Maintenance Plan wherein McQuay assumes benefits are to be realized.

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