McQuay AGZ 065A Installation Manual

Installation, Operation and Maintenance ManualIOMM AGZ-3Group: ChillerPart Number: 074641003Effective: June 2002Supercedes: IOMM AGZ-2Air-Cooled Scrol

10 AGZ 035A through 065A IOMM AGZ-3Water ConnectionsBring water piping to the evaporator through the side between the vertical supports. Provide taps

IOMM AGZ-3 AGZ 035A through 065A 11Table 4, Ethylene Glycol Correction FactorsFreeze Point%E.G.°F °CCapacity Power Flow Pressure Drop1026 -3 0.991 0.9

12 AGZ 035A through 065A IOMM AGZ-3Figure 7, Pressure Drop Curve03 A-040A04A-060A06A555NOMINAL MAXIMUM MINIMUMPressure Drop Flow Pressure Drop Flow Pr

IOMM AGZ-3 AGZ 035A through 065A 13Physical DataTable 7, AGZ 035AS through 045ASPHYSICAL DATA AGZ MODEL NUMBERSTANDARD EFFICIENCY 035AS 040AS 045ASBAS

14 AGZ 035A through 065A IOMM AGZ-3Table 8, AGZ 050AS through 065ASPHYSICAL DATA AGZ MODEL NUMBERSTANDARD EFFICIENCY 050AS 055AS 060AS 065ASBASIC DATA

IOMM AGZ-3 AGZ 035A through 065A 15Electrical DataField Wiring CAUTIONInternal power wiring to the compressors for single and multiple point optionare

16 AGZ 035A through 065A IOMM AGZ-3Table 10, AGZ 035A - 065A, 60 Hz, Compressor and Condenser Fan Motor Amp DrawRated Load Amps Locked Rotor AmpsCompr

IOMM AGZ-3 AGZ 035A through 065A 17Table 11, AGZ035A - 065A, 60 Hz Single Point Power, Field Wiring Data (continued)Wiring to StandardPower BlockWirin

18 AGZ 035A through 065A IOMM AGZ-3Electrical LegendFigure 8, Electrical Legend

IOMM AGZ-3 AGZ 035A through 065A 19Figure 9, Typical Field Wiring with Global UNT Controller

2 AGZ 035A through 065A IOMM AGZ-3Table of ContentsIntroduction...3General Description...

20 AGZ 035A through 065A IOMM AGZ-3Figure 10, Typical Field Wiring Diagram with MicroTech Controller

IOMM AGZ-3 AGZ 035A through 065A 21Figure 11, Single-point Connection with FanTrol

22 AGZ 035A through 065A IOMM AGZ-3Figure 12, Single-point Connection with SpeedTrol

IOMM AGZ-3 AGZ 035A through 065A 23Figure 13, Unit Control Schematic (UNT)

24 AGZ 035A through 065A IOMM AGZ-3Figure 14, Staging Schematic (UNT)

IOMM AGZ-3 AGZ 035A through 065A 25Figure 15, MicroTech Controller Schematic

26 AGZ 035A through 065A IOMM AGZ-3Figure 16, Unit Control Schematic (MicroTech)

IOMM AGZ-3 AGZ 035A through 065A 27Figure 17, Staging Schematic (MicroTech)

28 AGZ 035A through 065A IOMM AGZ-3Dimensional DataFigure 18, Dimensions AGZ 035A - 065ADimensionsinches (mm)Center Of Gravityinches (mm)Unit Weightsl

IOMM AGZ-3 AGZ 035A through 065A 29StartupPre Start-upThe chiller must be inspected to ensure no components became loose or damaged during shipping or

IOMM AGZ-3 AGZ 035A through 065A 3IntroductionGeneral DescriptionMcQuay Air-Cooled Global water chillers are complete, self-contained automatic refrig

30 AGZ 035A through 065A IOMM AGZ-3Extended1. Front seat both condenser liquid line service valves.2. Put both circuit switches in Pumpdown and Stop

IOMM AGZ-3 AGZ 035A through 065A 31Electrical Check Out CAUTIONElectrical power must be applied to the compressor crankcase heaters 24hours before sta

32 AGZ 035A through 065A IOMM AGZ-3OperationSequence of OperationStartingWith control power on, 115Vac power is applied through F1 to the compressor c

IOMM AGZ-3 AGZ 035A through 065A 33Software Description (Global UNT Interface Kit required to read orchange variables)Variable Name Description Defaul

34 AGZ 035A through 065A IOMM AGZ-3 Filter DriersEach refrigerant circuit is furnished with a full flow filter drier or an optional replaceable core t

IOMM AGZ-3 AGZ 035A through 065A 35NOTE: Before adjusting superheat, check that unit charge is correct and liquid linesightglass is full with no bubbl

36 AGZ 035A through 065A IOMM AGZ-3Global UNT Controller Installation and OperationThis section provides installation, setup and troubleshooting infor

IOMM AGZ-3 AGZ 035A through 065A 37Unit Set Points and CalibrationThe control software is installed and tested by the factory before shipping. No per

38 AGZ 035A through 065A IOMM AGZ-3Chilled Water Flow SwitchThe chilled water flow switch is connected to field wiring terminals #142 and #143 on TB-7

IOMM AGZ-3 AGZ 035A through 065A 39Digital InputsNote: All Digital Inputs are 24Vac supplied by transformer T2 in the control panel. Do notuse inputs

4 AGZ 035A through 065A IOMM AGZ-3InstallationNote: Installation is to be performed by qualified personnel who are familiar with local codesand regula

40 AGZ 035A through 065A IOMM AGZ-3As the OAT increases above the Outdoor Air Low Limit (OALL), the Actual Leaving Water Setpointis decreased from its

IOMM AGZ-3 AGZ 035A through 065A 41Figure 21, Zone Temperature ResetLWRBLWSPZTLL ZTHLZTRB(ZTLL=ZTHL -ZTRB)As the Zone Temperature increases above the

42 AGZ 035A through 065A IOMM AGZ-3Figure 23, DIP SWITCH CONFIGURATION REMOTE / DEMAND LIMITGlobal UNT Dipswitch SettingsSwitch 123456

IOMM AGZ-3 AGZ 035A through 065A 43Pumpdown ControlThe AGZ units have a one time pump down. The pump down is activated when a circuit’s liquid lineso

44 AGZ 035A through 065A IOMM AGZ-3Head Pressure ControlThere are two condenser fans per refrigerant circuit. These fans are cycled on and off accord

IOMM AGZ-3 AGZ 035A through 065A 45Zone Terminal (Optional)The Zone Terminal (ZT) is a hand-held or unit mounted device that monitors and adjusts your

46 AGZ 035A through 065A IOMM AGZ-3OPERATING MODESTwo operating modes are included: Monitor and Adjust.Monitor ModeAs soon as the ZT is connected, it

IOMM AGZ-3 AGZ 035A through 065A 47DISPLAYS, SYMBOLS, KEYS, AND BUTTONSThe Zone Terminal simultaneously displays three set points or sensed values. I

48 AGZ 035A through 065A IOMM AGZ-3CONNECTING THE ZONE TERMINALYou can unit mount the ZT, or use it as a portable tool for convenient access to any ch

IOMM AGZ-3 AGZ 035A through 065A 49Adjustable PointsThe following McQuay Global Scroll Chiller points are adjustable by the Zone Terminal.Table 16, Ad

IOMM AGZ-3 AGZ 035A through 065A 5LocationUnit PlacementAGZ units are for outdoor applications and can be mounted on a roof or ground level. Set unit

50 AGZ 035A through 065A IOMM AGZ-3OA Lockout - Indicates whether you are in OA lockout (see OA Lockout SP). No alarm.Cir#2Lead=On - Indicates which

IOMM AGZ-3 AGZ 035A through 065A 51UNT Troubleshooting ChartPROBLEM POSSIBLE CAUSES CORRECTIVE ACTIONSCompressor will notrun1. Main switch, circuit b

52 AGZ 035A through 065A IOMM AGZ-3MicroTech Controller Installation and OperationAll operational descriptions are based on the MicroTech controller s

IOMM AGZ-3 AGZ 035A through 065A 53Interlock wiringThe installing contractor provides all interlock wiring to field devices (such as flow switches and

54 AGZ 035A through 065A IOMM AGZ-3Field WiringInterconnecting wiring for the control panel can consist of the following:• 115 VAC power wiring• Chi

IOMM AGZ-3 AGZ 035A through 065A 55Digital OutputsThe digital output board has normally open solid-state relays with an on-board replaceable 5 ampfuse

56 AGZ 035A through 065A IOMM AGZ-3Controller Inputs /OutputsAnalog InputsAnalog inputs are used to read the various temperatures and pressures on the

IOMM AGZ-3 AGZ 035A through 065A 57Relay Board OutputsAll of the MicroTech panel outputs are controlled by solid-state relays which are driven by the

58 AGZ 035A through 065A IOMM AGZ-3Ice (for lower ice setpoint requirements, consult McQuay Marketing Support)When in “Ice” reset mode, and adequate

IOMM AGZ-3 AGZ 035A through 065A 59Manual OperationManual operating modes are available to simplify setup and troubleshooting of the unit. Any of the

6 AGZ 035A through 065A IOMM AGZ-3Figure 3, Clearance Requirements

60 AGZ 035A through 065A IOMM AGZ-3Pumpdown ControlThe AGZ units have a one-time pump down. If two compressors are operating on a refrigerant circuit

IOMM AGZ-3 AGZ 035A through 065A 61Circuit Alarm ConditionsThe “Circuit Alarm Conditions” are those alarms that only affect one circuit and can stop t

62 AGZ 035A through 065A IOMM AGZ-3If an alarm condition exists which prevents normal operation of both refrigerant circuits, the chillerwill be disab

IOMM AGZ-3 AGZ 035A through 065A 63Start-Up and ShutdownPre-Start CheckoutConfiguration default set points are entered at the factory and all values m

64 AGZ 035A through 065A IOMM AGZ-3above the LPCutIn value, a compressor on the lead circuit will start. Refer to the unit stagingschematic to determ

IOMM AGZ-3 AGZ 035A through 065A 65Menu Structure (general description)The information stored in the MicroTech controller can be accessed through the

66 AGZ 035A through 065A IOMM AGZ-3Keypad Key FunctionsThe MicroTech keypad consists of twelve pressure sensitive membrane switches (refer to Figure 2

IOMM AGZ-3 AGZ 035A through 065A 67Decr.When changing the value of a menu item entry, pressing “DECR. -” shifts the menu itemdisplay line to the next

68 AGZ 035A through 065A IOMM AGZ-3Menu #6: Circuit 62 PressuresThe circuit #2 evaporator and condenser refrigerant pressurereadings are displayed un

IOMM AGZ-3 AGZ 035A through 065A 69to a value equaling the Leaving Evaporator Water Set Point ("Lvg Evap") plus the value stored in the"

IOMM AGZ-3 AGZ 035A through 065A 7Vibration IsolatorsVibration isolators are recommended for all roof mounted installations or wherever vibrationtrans

70 AGZ 035A through 065A IOMM AGZ-3Figure 28, Delta-T Setpoints for ChillersMenu #15: Softload Set Points—The controller can limit the number of avail

IOMM AGZ-3 AGZ 035A through 065A 71Press the Next Item key. The display will show the current Day, Hour, Minute and Second. If thisinformation needs t

72 AGZ 035A through 065A IOMM AGZ-3Table 21, MENU 1 Chiller StatusScreen DisplayOFF: Manual ModeOFF: System SwOFF: Remote CommOFF: Remote SwOFF: Time

IOMM AGZ-3 AGZ 035A through 065A 73Table 27, MENU 7 Circ #1 Temp'sScreen DisplaySatur Evap=xxx°F (°C)1N/A **°F (°C)SuctLine = xxx.x°F (°C)Open °F

74 AGZ 035A through 065A IOMM AGZ-3Table 33, MENU 13 Control ModeScreen Display Factory Setpoint RangeManual Unit OffAutomaticManual Staging1 Manual U

IOMM AGZ-3 AGZ 035A through 065A 75Table 36, MENU 15 SoftLoad SptsScreen Display Factory Setpoint Range1 Time Left= xxmin2 SoftLoad= xx min 20 0 - 254

76 AGZ 035A through 065A IOMM AGZ-3Table 42, MENU 20 ScheduleScreen Display Factory Setpoint Range1 Override= xx.xx hr 0.00 Hr 00:00 - 63.502 NMPSched

IOMM AGZ-3 AGZ 035A through 065A 77Table 46, MENU 23 Misc SetupScreen Display Factory Setpoint Range1 Unit Type= Air Cooled - -2 Model AGZ 4 Stages -

78 AGZ 035A through 065A IOMM AGZ-3Trouble Analysis for the MicroTechMicroprocessor Control BoardThe Microprocessor Control Board (MCB) is shown in Fi

IOMM AGZ-3 AGZ 035A through 065A 79Following is the normal start-up sequence that the three status LED’s should follow when power isapplied to the MCB

8 AGZ 035A through 065A IOMM AGZ-3Water PipingLocal authorities can supply the installer with the proper building and safety codes required for safean

80 AGZ 035A through 065A IOMM AGZ-3Figure 30, Hex Switches1230456789ABCDEF1230456789ABCDEFHI (left) hex switch LO (right) hex switch* Hex switch setti

IOMM AGZ-3 AGZ 035A through 065A 81Test ProceduresStatus LED DiagnosticsThe MCB status LED indications can aid in controller diagnostics. If the statu

82 AGZ 035A through 065A IOMM AGZ-36. Reconnect the analog input ribbon cable. Cycle power to the controller and check the powerfuses.If both fuses a

IOMM AGZ-3 AGZ 035A through 065A 83Figure 31, MCB Power Supply TerminalsPOWER FUSES[BUSSMAN GDC-T2A]POWER IN[18-24 VCT]AC AC GND GNDAUX/OUT43219 8 7 6

84 AGZ 035A through 065A IOMM AGZ-3Troubleshooting Analog InputsAn analog input, such as a temperature sensor, is connected to the ADI board. The anal

IOMM AGZ-3 AGZ 035A through 065A 85Figure 32, Output Board Relay Socket12345LEDFuseTest Resistor330-680 Ohm*250V ~ 50/60 Hz*120V ~ 50/60 Hz WARNINGEle

86 AGZ 035A through 065A IOMM AGZ-32. Remove power from the controller by placing CB1 to the OFF position. Disconnect at least onewire from the power

IOMM AGZ-3 AGZ 035A through 065A 873. Remove power from the controller by opening CB1. Try to improve the connections in theAux/Out plug insulation d

88 AGZ 035A through 065A IOMM AGZ-3Unit MaintenanceGeneralOn initial start-up and periodically during operation, it will be necessary to perform certa

IOMM AGZ-3 AGZ 035A through 065A 89the sightglass could also indicate an excessive pressure drop in the liquid line, possibly due to aclogged filter-d

IOMM AGZ-3 AGZ 035A through 065A 9Figure 5, Typical Field Evaporator Water PipingFlow SwitchMount a water flow switch in either the entering or leavin

90 AGZ 035A through 065A IOMM AGZ-3Service CAUTION1. Service on this equipment is to be performed by qualified refrigerationpersonnel familiar with e

IOMM AGZ-3 AGZ 035A through 065A 91EvaporatorThe evaporator is the direct expansion, shell-and-tube type with refrigerant flowing through the tubesand

92 AGZ 035A through 065A IOMM AGZ-33. The charge can be added at any load condition between 25-100% load per circuit but at least two Ffans should be

IOMM AGZ-3 AGZ 035A through 065A 93AGZ Troubleshooting ChartPROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS1. Main Switch. 1. Close Switch.2. Fuse

94 AGZ 035A through 065A IOMM AGZ-3Notes

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