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  • Product Manual PM PEH/PFH-1

    Group: Chiller

    Date: April 1999

    Supersedes: PM PEH/PFH

    © 1998 McQuay International

    Centrifugal Compressor Water Chillers

    Model PFH, Dual Compressor, 160 to 2700 Tons (560 to 9500 kW)

    Model PEH, Single Compressor, 80 to 1300 Tons (280 to 4550 kW)

    HFC 134a, The Global Refrigerant of Choice

  • 2 Product Manual PM PEH/PFH-1

    Table of Contents

    Introduction ............................................ 3

    Design Advantages .................................. 4 Dual Compressor Design ................................... 4 HFC-134a: ........................................................ 5 Compressor Design........................................... 7 Compact Design...............................................11 Heat Exchangers...............................................12 Lubrication System...........................................12 SurgeGard.....................................................13 Pumpdown.......................................................13 Thermal Expansion Valves................................13 Factory Performance Test.................................14 McQuayService Startup....................................14

    PFH Design Features ............................. 15 The Redundancy Feature ..................................15 Part Load Efficiency.........................................17 Lower Installed Costs .......................................17 Bolt Together Construction...............................17 PFH Controls...................................................17

    Control Features.................................... 19 Building Management Systems ..........................22 Multiple Machine Control..................................22

    Sound.................................................... 25

    Unit Selection ........................................ 26

    Chiller Identification.............................. 28

    Physical Data and Weights ..................... 29 Condenser........................................................29 Evaporator .......................................................30

    Compressor..................................................... 30 Pumpout Units................................................. 32

    Dimensions ............................................33 Chillers............................................................ 33 Marine Water Boxes......................................... 45 Weights........................................................... 46 Pumpout Units................................................. 48

    Electrical Data ........................................49 Motor and Voltage Code.................................. 49 Motor Data...................................................... 50 Field Wiring..................................................... 53 Control Power ................................................. 54

    Motor Starters ........................................55

    Application Considerations ....................58 Pumps............................................................. 58 Evaporator Water Temperature......................... 58 System Water Volume...................................... 58 Condenser Water Temperature ......................... 58 Oil Coolers...................................................... 59 Machine Room Ventilation ............................... 60 Thermal Storage............................................... 61 Variable Speed Pumping .................................. 61 Variable Frequency Drives................................ 61 Free Cooling.................................................... 62 Heat Recovery Heat Pumps, Templifiers........... 62 Heat Recovery Chillers..................................... 62 Vibration Mounting .......................................... 62

    Options and Accessories.........................63

    Specifications.........................................65

    (Cover picture: Model PFH 126, 2300 ton dual compressor chiller)

    Our facility is ISO9002 Certified

    Initial Issue September, 1998 "McQuay" is registered trademarks of McQuay International

    1996 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"

  • Product Manual PM PEH/PFH-1 3

    Introduction

    Proven Design Offers Competitive Full and Part Load Efficiencies. William James once said "The true value of a concept expresses itself in practical consequences." The validity of the original design concept of the McQuay centrifugal chiller line has proven itself eloquently over the past 30 years and is even more relevant today in the face of worldwide environmental concerns and the urgent need for optimum operating efficiencies. Many features were designed into the original compressors and chillers, others have been added over the years as product improvements and refinements. All contribute important benefits to equipment owners.

    FEATURES BENEFITS

    Alternative refrigerant leadership- Complete HFC-134a centrifugal chiller line

    The confident choice for the future-Positive pressure-Environmentally safe -Non-toxic- No purge unit

    Dual compressors available up to 2,500 tons- (8750 kW) Two of all mechanical and electrical components

    Lower annual energy cost than any single compressor chiller - Dual compressor reliability

    New generation MicroTech Control A complete chiller plant controller-Open protocol-Loaded with customer benefits-See detailed specification

    Bolt together construction at tube sheets. Easy disassembly and reassembly at the job site for those difficult retrofit installations

    Pumpdown capability-Entire charge can be valved off and stored in the condenser

    Eliminates the need for a separate pumpout vessel in most situations

    Small footprint Optimizes equipment room space

    Units performance tested in the factory to job conditions, within established limits

    Factory testing assures trouble free startups and reliable operation

    30 years refinement and factory ISO 9002 Certified

    Insures consistent quality for long, trouble free operation

    Certification McQuay chillers for specific capacity and component assemblies have been submitted to Underwriters Laboratories Inc. for

    certification and listing. Their symbol will be affixed only to those units when required by specification or code. Consult the factory for

    selection on all applications where UL is required.

    Full ARI 550 participation and certification has been an on-going commitment at McQuay International. The ARI label affixed to

    certified units, certifies that the unit will meet the specified performance. This equipment is certified in accordance with ARI Standard

    550, latest edition, provided the application ratings are within the scope of the certification program. This excludes the following

    applications: air and evaporative cooled chillers, capacity exceeding 2000 tons (7000 kW), voltages above 5000 volts, brine and special

    fluids other than water, 50 Hz, and heat recovery.

  • 4 Product Manual PM PEH/PFH-1

    Design Advantages

    Dual Compressor Design

    Dual Compressor Chillers Offer Better Efficiency, Lower Installed Costs, Less Floor Space, And Higher Reliability Than Single Compressor Designs

    Note: Building part load data directly from a major manufacturer’s load and energy program

    Most buildings operate at their full design cooling load for only a few hours a year, yes, hours. In fact some buildings, schools for example, may never run at full design load. Except for some electrical demand considerations, why be concerned about a chiller’s full load kW/ton (COP) at all? The real question should be "what does it cost to run the chiller in my building, at my loads, and my power costs?"

    The answer to this questions is in the part load efficiency of the chiller-and no chiller can do as well as the McQuay Dual Centrifugal. These chillers excel when it comes to operating efficiency in the five percent to sixty percent capacity range-where 70 percent of the annual operating occur in most buildings. The building part load curves shown above are from detailed energy studies performed on various building types.

    See page 15 for a comprehensive discussion of dual compressor advantages.

  • Product Manual PM PEH/PFH-1 5

    HFC-134a:

    Helping To Keep The Ozone Whole!

    McQuay Positive Pressure Design:

    No Purge

    No Vacuum Prevention System

    No Contaminants HFC-134a operates above atmospheric pressure in the entire refrigerant circuit. Negative (low) pressure systems require a purge unit to remove non-condensables (air, water vapor, etc.) that leak into the chiller during operation and compromise chiller performance. Purge units, even the new "high efficiency" types, regularly have to vent refrigerant to the atmosphere, along with the non-condensables. The 1990 Clean Air Act has prohibited the intentional venting of refrigerant since July 1, 1992. The environmentally responsible positive pressure system eliminates this regular venting of refrigerant.

    Great care is taken by manufacturers and service personnel to ensure that refrigeration systems are dry when they are manufactured or serviced. It makes no sense at all to buy a negative pressure HCFC-123 chiller that ingests water vapor during normal operation.

    In addition to the refrigerant loss an