Page 2 - Table of Contents; Dimensions; Manufactured in an ISO Certified Facility
2 Centrifugal Chillers IMM W MC-2 Table of Contents Introduction ........................................... 3 Nomenclature................................................. 3 Installation ............................................. 4 Receiving and Handling................................. 4 Locati...
Page 3 - Introduction; Nomenclature; DANGER; CAUTION
IMM W MC-2 Centrifugal Chillers 3 Introduction General Description The McQuay Model WMC Centrifugal Water Chillers are complete, self-contained, automatically controlled, fluid-chilling units featuring oil-free, magnetic bearing compressors. Each unit is completely assembled and factory tested befor...
Page 4 - Installation; Receiving and Handling
4 Centrifugal Chillers IMM W MC-2 Installation Receiving and Handling The unit should be inspected immediately after receipt for possible damage. All McQuay centrifugal water chillers are shipped FOB factory and all claims for handling and shipping damage are the responsibility of the consignee. On ...
Page 5 - Location and Mounting; Note; Valves must remain closed until start-up by the McQuay technician.; Water Piping
IMM W MC-2 Centrifugal Chillers 5 Location and Mounting Clearance The unit must be mounted on a level concrete or steel base and must be located to provide service clearance at one end of the unit for possible removal of evaporator and/or condenser tubes. Evaporator and condenser tubes are rolled in...
Page 6 - Important Notes on Welding; Chiller units must have flow switches for the evaporator and
6 Centrifugal Chillers IMM W MC-2 The piping should include thermometers at the inlet and outlet connections and air vents at the high points. The water heads can be interchanged (end for end) so that the water connections can be made at either end of the unit. If this is done, use new head gaskets ...
Page 7 - Cooling Towers; condenser bypass; Condenser Water Temperature; McQuay chillers will
IMM W MC-2 Centrifugal Chillers 7 Cooling Towers The condenser water flow rate must be checked to be sure that it conforms to the system design. A tower bypass valve, controlled by the unit controller, is required to control the minimum condenser entering temperature. Unless the system and chiller u...
Page 8 - Field Insulation; Evaporator; Table 1, Evaporator Physical Data; Condenser; Table 2, Condenser Physical Data
8 Centrifugal Chillers IMM W MC-2 Field Insulation If the optional factory-installation of thermal insulation is not ordered, insulation should be field installed to reduce heat loss and prevent condensation from forming. Insulation should cover the evaporator barrel, tube sheet, and water heads, pl...
Page 10 - Figure 6
10 Centrifugal Chillers IMM W MC-2 Figure 6 , WMC 145D (See page 14 for notes.)
Page 11 - Figure 7
IMM W MC-2 Centrifugal Chillers 11 Figure 7 , WMC 150D , 2-Pass Evaporator, 2-Pass Condenser ( See page 14 for notes . )
Page 12 - for notes
12 Centrifugal Chillers IMM W MC-2 Figure 8, WM C 250D , 2-Pass Evaporator, 2-Pass Condenser (NOTE : See page 14 for notes . )
Page 13 - Figure 9
IMM W MC-2 Centrifugal Chillers 13 Figure 9 , WMC 290D , 2-Pass Evaporator, 2- Pass Condenser ( See page 14 for notes . )
Page 14 - Drawing Notes
14 Centrifugal Chillers IMM W MC-2 Drawing Notes NOTES: 1. All dimensions are in Inches and [Millimeters] unless noted otherwise. 2. Final connections must allow for .500 inch +/- [12.7mm] manufacturing tolerances. 3. 1.00-inch FPT [25.4 mm] evaporator and condenser relief valves must be piped per A...
Page 15 - Mounting/Lifting Weights
IMM W MC-2 Centrifugal Chillers 15 Mounting/Lifting Weights Figure 10 Shipping Weight, lbs (kg) Lifting Location inch (mm) WMC Model Vessel Models (Size) LF RF LB RB Total “A” “B” 145S E2209/C2009 1238 (561) 1146 (520) 1565 (710) 1450 (6580 5399 (2449) 4.0 (102) 112.0 (2845) 145D E2209/C2209 1438 (6...
Page 16 - Pressure Drop Curves; Figure 11, WMC 150, Evaporator Pressure Drops
16 Centrifugal Chillers IMM W MC-2 Pressure Drop Curves Figure 11, WMC 150, Evaporator Pressure Drops Figure 12, WMC 150, Condenser Pressure Drops WMC Cond - Water Side Pressure Drop 0.0 10.0 20.0 30.0 40.0 50.0 60.0 0 500 1000 1500 2000 2500 CGPM - gpm C P D - f t C2012-B 1 pass C2012-B 2 pass C200...
Page 17 - Relief Valves; Figure 13, Condenser 3-Way Relief Valve; Refrigerant Vent Piping; C). To convert values to the older ARI
IMM W MC-2 Centrifugal Chillers 17 Relief Valves As a safety precaution and to meet code requirements, each chiller is equipped with pressure relief valves located on the condenser and evaporator for the purpose of relieving excessive refrigerant pressure (caused by equipment malfunction, fire, etc....
Page 18 - per relief valve
18 Centrifugal Chillers IMM W MC-2 Using the ASHRAE formula and basing calculations on the 225 psi design yields a conservative pipe size, which is summarized in Table 4. The table gives the pipe size required per relief valve . When valves are piped together, the common piping must follow the rules...
Page 19 - Electrical Data; Important; : The voltage to these units must be; Power Wiring; Table 5, WMC Electrical Connections; General Note
IMM W MC-2 Centrifugal Chillers 19 Electrical Data Wiring, fuse and wire size must be in accordance with the National Electric Code (NEC). Important : The voltage to these units must be within ± 10% of nameplate voltage, and the voltage unbalance between phases must not exceed 2%. Since a 2% voltage...
Page 20 - WMC 145S, Single Compressor; Table 6, Standard Single Point Connection,; Table 7, Disconnect Switch Size
20 Centrifugal Chillers IMM W MC-2 WMC 145S, Single Compressor Table 6, Standard Single Point Connection, 1 Compressor Only Field Wire RLA (Per Compressor) LRA Minimum Circuit Ampacity (MCA) Quantity Wire GA Max Fuse Size 79 to 80 Amps 110 97 to 100 3 3 GA 175 Amps 81 to 88 Amps 110 101 to 110 3 2 G...
Page 21 - Single Point and Multi-point Connection
IMM W MC-2 Centrifugal Chillers 21 Single-point Connection, Optional Table 9, WMC 145D, 150D Electrical Data Field Wire RLA (Per Compressor) LRA Minimum Circuit Ampacity (MCA) Quantity Wire GA Max Fuse Size 52 to 53 Amps 72 117 to 120 3 1 GA 150 Amps 54 to 57 Amps 72 122 to 129 3 1 GA 175 Amps 58 to...
Page 22 - Single Point Connection, Optional; Table 11, Single Point and Multi-point Connection
22 Centrifugal Chillers IMM W MC-2 Single Point Connection, Optional Field Wire RLA (Per Compressor) LRA Minimum Circuit Ampacity (MCA) Quantity Wire GA Max Fuse Size 79 to 88 Amps 110 176 to 199 3 4/0 250 Amps 89 to 92 Amps 110 201 to 208 3 250 MCM 250 Amps 93 to 100 Amps 110 210 to 226 3 250 MCM 3...
Page 23 - Figure 15, Field Wiring Diagram; Field Wiring Diagram Notes
80 * CHILLED WATER PUMP STARTERS EWI-2 CP2 CP1 NOTE 11 NOTE 11 NOTE 11 * NOTE 8 NOTE 8 NOTE 9 H O A C4 * COOLING TOWER FIRST STAGE STARTER * COOLING TOWER SECOND STAGE STARTER * COOLING TOWER THIRD STAGE STARTER * COOLING TOWER FOURTH STAGE STARTER * NOTE 10 H A O C3 * NOTE 10 H A O NOTE 10 NOTE 10 ...
Page 24 - Control Wiring; Use with On-Site Generators; Transfer Back to Grid Power:; avoid compressor damage.
24 Centrifugal Chillers IMM W MC-2 8. Optional customer supplied 115 VAC, 25-VA maximum coil rated, chilled water pump relay (ep1 & 2) may be wired as shown. This option will cycle the chilled water pump in response to chiller demand. 9. The condenser water pump must cycle with the unit. A custo...
Page 25 - Chiller Control Power:; System Pumps; Current Harmonics
1. Set the generator to always run five minutes longer than the unit start-to-start timer, which could be set from 15 to 60 minutes. The actual setting can be viewed on the operator interface panel on the Setpoint/Timer screen. 2. Configure the transfer switch, provided with the generator, to automa...
Page 26 - Line Reactors
26 Centrifugal Chillers IMM W MC-2 1. Keep the PCC as far from the drives (close to the power source) as possible. 2. Increase the size (decrease the impedance) of the source transformer. 3. Increase the capacity (decrease the impedance) of the busway or cables from the source to the PCC. 4. Make su...
Page 27 - Figure 16, Typical WMC Power Wiring
The filters are current-rated devices. In order to properly size a filter, it is necessary to know the operating voltage and the input current rating of the drive. No derating or re-rating is necessary when applying the filter at voltages that are less than or equal to the maximum voltage listed on ...
Page 28 - Multiple Chiller Setup; Communication Setup; Verify correct nodes on each OITS Service Screen.; Interconnection; Note that Chiller B does not have, or need, an isolation board.
28 Centrifugal Chillers IMM W MC-2 Multiple Chiller Setup WMC dual compressor units have their main control components factory wired to an internal network so that the components can communicate with each other, within the chiller itself. On multi-chiller WMC applications, two WMC chillers can be in...
Page 29 - Figure 17, Communication Wiring; Chiller A; Chiller B; MicroTech II Operator Interface Touch Screen (OITS) Settings
Figure 17, Communication Wiring Chiller A 485 OPDR C A B UCM J10 J11 BLU/WHT WHT/BLU SHIELD (+) (-) J11 PORT Chiller B P P MicroTech II Operator Interface Touch Screen (OITS) Settings Settings for any type of linked multiple compressor operation must be made to the MicroTech II controller. Settings ...
Page 30 - Operating Sequence; See; Prestart System Checklist
30 Centrifugal Chillers IMM W MC-2 Operating Sequence For multiple-chiller, parallel operation, the MicroTech II controllers are tied together by a communications network and stage and control compressor loading among the chillers. Each compressor, single or dual compressor chiller, will stage on or...
Page 31 - Operation; Operator Responsibilities
Operation Operator Responsibilities It is important that the operator become familiar with the equipment and the system before attempting to operate the chiller. During the initial startup of the chiller, the McQuay technician will be available to answer any questions and instruct in the proper oper...
Page 32 - System Water Volume; MicroTech II Control; Figure 18, MicroTech II Control Panel
32 Centrifugal Chillers IMM W MC-2 System Water Volume It is important to have adequate water volume in the system to provide an opportunity for the chiller to sense a load change, adjust to the change, and stabilize. As the expected load change becomes more rapid, a greater water volume is needed. ...
Page 33 - Building Automation Systems; Open Choices; Table 13, Typical Data Point Availability; Connection to Chiller
Building Automation Systems All MicroTech II controllers with Open Choices™ are capable of BAS communications, providing easy integration and comprehensive monitoring, control, and two-way data exchange with open standard protocols such as L onTalk , Modbus or BACnet . Open Choices Ben...
Page 34 - Protocols Supported; Table 14, Standard Protocol Data; MicroTech II Chiller Unit Controller Protocol
34 Centrifugal Chillers IMM W MC-2 Protocols Supported Table 14, Standard Protocol Data Protocol Physical Layer Data Rate Controller Other BACnet /IP Ethernet 10 Base-T 10 Megabits/sec Color graphics SBC Reference ED 15057: BACnet PICS BACnet MSTP RS485 (TBD) pCO 2 Unit Controller Reference ED 150...
Page 35 - Figure 19, Unit Control Panel; Capacity Control System; The capacity of the chiller is controlled by:
Figure 19, Unit Control Panel Capacity Control System The capacity of the chiller is controlled by: 1) Staging the compressors on and off; 2) By adjusting the capacity of each compressor by opening or closing the inlet vanes to control the quantity of refrigerant entering the impeller; and, 3) Varyi...
Page 36 - Surge and Stall; Shutdown; Operator Interface Panel,; (LOCAL) Home Screen 1 has AUTO and STOP buttons that are only active
36 Centrifugal Chillers IMM W MC-2 The speed control and vane control work in conjunction. As load decreases, compressor speed is reduced as low as possible but above the point where stall might begin. If further capacity reduction is required, the guide vanes will close to whatever position is requ...
Page 37 - Annual Unit Startup/Shutdown; Annual Shutdown
when it is under control from a remote switch or BAS. When these buttons are pressed, the unit will cycle through its normal starting or stopping sequence, both compressors will be stopped and normal dual compressor starting procedure will be in effect. 2. Remote SWITCH , Selecting SWITCH in SP3 wil...
Page 38 - Maintenance; Pressure/Temperature Chart; Routine Maintenance; Refrigerant Cycle
38 Centrifugal Chillers IMM W MC-2 Maintenance ! DANGER W ait 10 minutes after compressor shutdown before opening any compressor access panel. The DC link capacitors store enough energy to cause electrocution. Pressure/Temperature Chart R-134a Temperature Pressure Chart °F PSIG °F PSIG °F PSIG °F PS...
Page 39 - Electrical System; Cleaning and Preserving; Repair of System; Pressure Relief Valve Replacement
Electrical System Maintenance of the electrical system involves the general requirement of keeping contacts clean and connections tight and checking on specific items as follows: 1. The compressor current draw should be checked and compared to nameplate RLA value. Normally, the actual current will b...
Page 40 - Pressure Testing; at least 1000 microns of mercury; Charging the System
40 Centrifugal Chillers IMM W MC-2 complete the pump down, condense the refrigerant, and pump it into the condenser or pumpout vessel using approved procedures. Pressure Testing No pressure testing is necessary unless some damage was incurred during shipment. Damage can be determined by a visual ins...
Page 41 - compressor must not be started at this time.; NOTE; handling and emission of refrigerants are observed.
pumps operating, liquid refrigerant will flow into the condenser. Approximately 75% of the total requirement estimated for the unit can be charged in this manner. 5. After 75% of the required charge has entered the condenser, reconnect the refrigerant drum and charging line to the service valve on t...
Page 42 - Maintenance Schedule
42 Centrifugal Chillers IMM W MC-2 Maintenance Schedule I. Compressor A. Performance Evaluation (Log & Analysis) * O B. Motor • Ampere Balance (within 10%) X • Terminal Check (tight connections, porcelain clean) X • Motor Cooling (check temperature) X C. Vane Operation • Compressor Loads: Operat...
Page 43 - Warranty Statement; Limited Warranty
Service Programs It is important that an air conditioning system receive adequate maintenance if the full equipment life and full system benefits are to be realized. Maintenance should be an ongoing program from the time the system is initially started. A full inspection should be made after 3 to 4 ...
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