Water-Cooled Screw Compressor ?· Water-Cooled Screw Compressor Chiller WHS 155A - WHS 200A, ......

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  • Installation, Operation and Maintenance Manual IOMM WHS

    Group: Chiller

    Part Number:746462

    Effective: November 1998Supersedes: IM 692-1

    1997 McQuay International

    Water-Cooled Screw Compressor Chiller

    WHS 155A - WHS 200A, R-22WHS 220A, R-410A60 Hertz

  • 2 WHS 155A- 220A IOMM WHS

    Table of ContentsIntroduction.................................................................................................................3

    Receiving and Handling...............................................................................................................................3Installation...................................................................................................................4

    Location and Mounting....................................................................................................................................4Compressor Condensation...............................................................................................................................4Vibration Isolators..............................................................................................................................................4Evaporator and Condenser Water Piping.......................................................................................................7Water Treatment.................................................................................................................................................7Head Pressure Control, Tower System...........................................................................................................7Head Pressure Control, Well Water System...................................................................................................8Relief Valve Piping .............................................................................................................................................8Temperature and Water Flow Limitations.......................................................................................................9Startup With Cold Condenser Water..............................................................................................................9Evaporator Freeze Protection...........................................................................................................................9Condenser Protection and Design Considerations ......................................................................................9Chilled Water Thermostat.................................................................................................................................9Refrigerant Charge...........................................................................................................................................10Detection of Loss of Flow..............................................................................................................................10Glycol Solutions...............................................................................................................................................10Chilled Water Quantity....................................................................................................................................11

    Evaporator and Condenser Water Flow and Pressure Drop...................................12

    Physical Data.............................................................................................................16

    Dimensional Data......................................................................................................18

    Field Wiring ...............................................................................................................22

    General Information.....................................................................................................................................22Pre-Start-up...............................................................................................................26

    Sequence of Operation..............................................................................................26

    Initial Conditions..............................................................................................................................................26Off Conditions..................................................................................................................................................27Alarm..................................................................................................................................................................27Initial Start-up...................................................................................................................................................27Load Recycle ....................................................................................................................................................28

    Maintenance..............................................................................................................28

    General..........................................................................................................................................................28Compressor Maintenance..........................................................................................................................28Lubrication ...................................................................................................................................................28Electrical Terminals ......................................................................................................................................29Condensers ..................................................................................................................................................29Refrigerant Sightglass ................................................................................................................................29Lead-Lag.......................................................................................................................................................29

    Preventative Maintenance Schedule ............................................................................................................30"McQuay" is a registered trademark of McQuay International

    1997 McQuay International"Illustrations cover the general appearance of McQuay International products at the time of publication and we reserve the right to

    make changes in design and construction at anytime without notice"

  • IOMM WHS WHS 155A - 220A 3

    Introduction

    McQuay StarGate water-cooled chillers are completely assembled, factory wired, evacuated,charged, tested and ready for installation. Each unit consists of a water-cooled condenser withintegral subcooler, dual accessible semi-hermetic single screw compressors with suction anddischarge shutoff valves, replaceable tube shell-and-tube evaporator, and complete refrigerant piping.Liquid line components included are manual liquid line shutoff valves, charging valves, filter-dryers,liquid line solenoid valves, sightglass/moisture indicators, and electronic expansion valves. Otherfeatures include compressor heaters, and an advanced fully integrated microprocessor control system.

    The electrical control center includes all safety and operating controls necessary for dependableautomatic operation, (the high and low pressure controls are external from the electrical controlcenter). Compressors are protected by solid-state overload protection and over temperatureprotection.

    Receiving and HandlingInspect the unit immediately after receipt for possible damage. The unit is shipped FOB factory and allclaims for handling and shipping damage are the responsibility of the consignee. Leave the shippingskid in place until the unit is in final position. This will aid in handling the equipment. Use extremecare when rigging the equipment to prevent damage to the control center, or refrigerant piping. SeeDimensional Data for the center of gravity of the unit.

    Lift the unit by fastening the rigging hooks to the four corners of the evaporator where the riggingeyes are located (see Figure 1). Use spreader bars between the rigging lines to prevent damage to thecontrol center.

    Figure 1, Rigging Eyes

    Rigging EyesRigging Eyes

  • 4 WHS 155A- 220A IOMM WHS

    Installation

    CAUTION

    Installation must be performed by qualified personnel who are familiar with local codes,regulations, and experienced with this type of equipment.

    Start-up by McQuayService is included on all units sold for installation within North Americaexcluding Mexico. Two weeks prior notification of start-up is required. The contractor should obtaina copy of the Start-up Scheduled Request Form from the sales representative or from the nearestMcQuayService office.

    Location and MountingMount the unit on level concrete or steel base. Service and tube pull clearance (at either end of theunit) is 14 feet (4.3 m). Evaporator and condenser tubes are rolled into the tube sheets to permitreplacement. Clearance at the sides and other end, including the top, is 3 feet (1 m).

    Make certain the floor or structural support is adequate to support the full operating weight of thecomplete unit. Optional rubber-in-shear pads, or spring isolators can be ordered for use under eachcorner of the base members. It is not necessary to bolt the unit to the mounting slab or frame work;although mounting holes are provided in the unit support at the four corners.

    Compressor CondensationCondensation occurs on the compressor surface when the temperature of the compressor surface islower than the ambient dew point temperature.