McQuay AGZ 030A Installation And Operation Manual
  1. Manuals
  2. Brands
  3. McQuay Manuals
  4. Chiller
  5. AGZ 030A
  6. Installation and operation manual

McQuay AGZ 030A Installation And Operation Manual

Air-cooled global chiller
Hide thumbs
Table of Contents

Advertisement

Quick Links

Air-Cooled Global Chiller
Type AGZ 030A through 065A
60 Hertz, English and Metric
Scroll Compressors using Refrigerant R-22
© 1997 McQuay International
Installation and Operation Manual
IOM 686
Group: Chiller
Part Number: 062994901
Effective: March 1997
Supersedes: None

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the AGZ 030A and is the answer not in the manual?

Questions and answers

Related Manuals for McQuay AGZ 030A

Summary of Contents for McQuay AGZ 030A

  • Page 1 Installation and Operation Manual IOM 686 Group: Chiller Part Number: 062994901 Effective: March 1997 Supersedes: None Air-Cooled Global Chiller Type AGZ 030A through 065A 60 Hertz, English and Metric Scroll Compressors using Refrigerant R-22 © 1997 McQuay International...

  • Page 2: Table Of Contents

    "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" AGZ 030A through 065A...

  • Page 3: Introduction

    McQuay is not responsible for physical damage after unit leaves the factory. Note: Unit shipping and operating weights are available in the Physical Data tables beginning on page 13. IOM 686 AGZ 030A through 065A...

  • Page 4: Installation

    Figure 2, Suggested lifting arrangement Number of fans may vary from this diagram. The Spreader Bars lifting method will remain recommended the same (use caution) These rigging holes must be used. AGZ 030A through 065A IOM 686...

  • Page 5: Location

    MicroTech controller. Low pressure, and motor protector controls are on the compressor. Most other operational, safety and starting controls are located in the unit control box. The condenser fan and motors can be removed from the top of the unit. IOM 686 AGZ 030A through 065A...

  • Page 6: Vibration Isolators

    Table 2 lists spring isolator part numbers for all unit sizes. See Dimensional Data for dimensions required to secure each isolator to the mounting surface. Figure 3, Clearance requirements AGZ 030A through 065A IOM 686...

  • Page 7: Water Piping

    Install piping with minimum bends and changes in elevation to minimize pressure drop. Consider the following when installing water piping: Vibration eliminators to reduce vibration and noise transmission to the building. Shutoff valves to isolate the unit from the piping system during unit servicing. IOM 686 AGZ 030A through 065A...
  • Page 8 12. Perform a preliminary leak check before insulating the piping and filling the system. 13. Piping insulation should include a vapor barrier to prevent condensation and possible damage to the building structure. Figure 5, Typical field evaporator water piping AGZ 030A through 065A IOM 686...

  • Page 9: Flow Switch

    (using R-22) for each unit is shown in the Physical Data tables beginning on page 13. Superheat and Subcooling For optimum operation, set the evaporator superheat for 8 - 12°F (4.4 - 6.6°C) and condenser subcooling (at the liquid shutoff valves) to 15°F (8.3°C). IOM 686 AGZ 030A through 065A...

  • Page 10: Glycol Solutions

    0.946 0.966 1.178 1.308 Table 5, Propylene glycol Freeze Point P.G. °F °C Cap. 0.987 0.992 1.010 1.068 0.975 0.985 1.028 1.147 0.962 0.978 1.050 1.248 0.946 0.971 1.078 1.366 0.929 0.965 1.116 1.481 AGZ 030A through 065A IOM 686...

  • Page 11: Evaporator Water Flow And Pressure Drop

    Measure the chilled water pressure drop through the evaporator at factory installed pressure taps. It is important not to include the effect of valves or strainers in these readings. Varying chilled water flow through the evaporator while the compressor(s) are operating is not recommended. IOM 686 AGZ 030A through 065A...
  • Page 12 148.00 9.34 35.2 105.2 247.00 15.58 17.8 92.00 5.80 Minimum and maximum flows are established to ensure the Delta-T for each unit size falls within the 6 - 16°F range for proper unit control. AGZ 030A through 065A IOM 686...

  • Page 13: Physical Data

    NOTES: Nominal capacity based on 95F ambient air and 54F/44F water range. Units with 1.0 Hp Fan Motors, Uses 1.5 Hp Fan Motors when unit is 380V / 60 Hz and 575V / 60Hz. IOM 686 AGZ 030A through 065A...
  • Page 14 .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5) Vent - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .375 (9.5) NOTE: Nominal capacity based on 95F ambient air and 54F/44F water range. AGZ 030A through 065A IOM 686...
  • Page 15 Drain - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) Vent - NPT int, In. (mm) .375 (9.5) .375 (9.5) .375 (9.5) NOTE: Nominal capacity based on 95F ambient air and 54F/44F water range. IOM 686 AGZ 030A through 065A...

  • Page 16: Electrical Data

    1.25 (32) 2.00 (51) 2.00 (51) 055AS 1.50 (38) 1.25 (32) 1.25 (32) 2.50 (64) 2.50 (64) 060AS 1.50 (38) 1.25 (32) 1.25 (32) 2.50 (64) 2.50 (64) 065AS 1.50 (38) 1.25 (32) 1.25 (32) AGZ 030A through 065A IOM 686...
  • Page 17 # 4 - 400 MCM # 3 - 300 MCM 045AS #12 - 2/0 #4 - 4/0 #12 - 2/0 #14 - 1/0 #12 - 2/0 #14 - 1/0 Table continued on next page IOM 686 AGZ 030A through 065A...
  • Page 18 Requires a single disconnect to supply electrical power to the unit. This power must be fused. All field wiring to unit power block or optional non-fused disconnect switch must be copper. All field wire size values given in table apply to 75° C rated wire per NEC. AGZ 030A through 065A IOM 686...
  • Page 19 Figure 8, Typical Field Wiring with Global UNT Controller IOM 686 AGZ 030A through 065A...
  • Page 20 Figure 9, Typical Field Wiring Diagram with MicroTech Controller AGZ 030A through 065A IOM 686...
  • Page 21 Figure 10, Single-point Connection with FanTrol IOM 686 AGZ 030A through 065A...
  • Page 22 Figure 11, Single-point Connection with SpeedTrol AGZ 030A through 065A IOM 686...
  • Page 23 )LJXUH   8QLW &RQWURO 6FKHPDWLF 817 ,20  $*= $ WKURXJK $...
  • Page 24 Figure 13, Staging Schematic (UNT) AGZ 030A through 065A IOM 686...
  • Page 25 Figure 14, MicroTech Controller Schematic IOM 686 AGZ 030A through 065A...
  • Page 26 Figure 15, Unit Control Schematic (MicroTech) AGZ 030A through 065A IOM 686...
  • Page 27 Figure 16, Staging Schematic (MicroTech) IOM 686 AGZ 030A through 065A...

  • Page 28: Dimensional Data

    Dimensional Data Figure 17, Dimensions AGZ 030A through 065A Center of Gravity Additional Weight MODEL inch / mm for Units with Copper Number Operating Shipping Fin Coils lb / kg 030AS 86.2 81.7 61.6 22.3 15.0 43.9 40.2 35.9 3425 3350 (2189.5)

  • Page 29: Agz Unit Check-Out

    10. Check between TB-3 terminal #17 and #27 for 24Vac control voltage. 11. Check on the Global UNT controller between terminals marked 24Vac and common for 24 Vac control voltage. Green light on Global UNT controller should be flashing. IOM 686 AGZ 030A through 065A...

  • Page 30: Agz Troubleshooting Chart

    Check supply voltage. Notify power company. Do not start until fault is corrected. Compressor Operating beyond design conditions Add facilities so conditions are within allowable limits Thermal Protection Discharge valve partially shut Open valve Switch Open Blown compressor internal gasket Replace gasket AGZ 030A through 065A IOM 686...

  • Page 31: Global Unt Controller Installation And Operation

    Be prepared to record all operating parameters required by the “Compressorized Equipment Warranty Form”. Return this information within 10 working days to McQuay International as instructed on the form to obtain full warranty benefits.

  • Page 32: Shutdown

    When starting the unit, electrical power must be on for 24 hours before starting the chiller. To start the chiller after an extended shutdown, follow the pre startup and startup instructions. AGZ 030A through 065A IOM 686...

  • Page 33: Sequence Of Operation

    0 to 15 Unoccpd Lvg SP 40 to 90 OA Lockout SP -20 to 65 Lvg Low Lim SP 20 to 40 SoftSta Capcty 0 to 100% SoftStart Time 2 min 0 to 20 minutes IOM 686 AGZ 030A through 065A...

  • Page 34: Software Description (Global Unt Interface Kit Required To Read Or Change Variables)

    The bulb has to have a stable ambient air temperature for proper operation. Placing the bulb in contact with the evaporator refrigerant line will limit the operation of the hot gas bypass valve. AGZ 030A through 065A IOM 686...

  • Page 35: Combination Filter Drier

    The power element is removable from the valve body without removing the valve from the line. IOM 686 AGZ 030A through 065A...

  • Page 36: Crankcase Heaters

    All interlock wiring to field devices (such as a flow switch or time clock) is provided by the installing contractor. All interlocking wiring must be connected to the Global UNT 24Vac power supply. External power supplies connected to the Global UNT controller can damage the controller. See unit wiring diagram. AGZ 030A through 065A IOM 686...
  • Page 37 If remote stop/start control is selected, remove the jumper between terminals #140 and #141 on TB-7 and install the input between these terminals. When the remote stop/start switch is open, the controller will be in the unoccupied mode. IOM 686 AGZ 030A through 065A...

  • Page 38: Controller Inputs /Outputs

    F ( -12 to 15 AI-5 Circuit #2 Evap Pressure Circuit #2 Suction Line 0 to 150 psi (0 - 1034kPa) AI-6 Control Band Setpoint Dial Control Panel 0 to 10 F (-17 to -12 AGZ 030A through 065A IOM 686...
  • Page 39 Figure 18, Outside Air Reset LW R B LW S P O A L L O A H L O A R B (O A L L = O A H L - O A R B ) IOM 686 AGZ 030A through 065A...
  • Page 40 (AI-4) plus an adjustable Leaving Water Setpoint Offset. This value takes into account the temperature differential between Leaving and Return water temperatures, which is typically about 10 F. If both the Leaving and Return water sensors are unreliable, the compressor is forced to 0%. AGZ 030A through 065A IOM 686...

  • Page 41: Additional Global Unt Controller Features41

    When the remote stop/start switch is open, the controller will be in the unoccupied mode. The unit will be enabled when the remote start / stop switch is closed and will control at the leaving water temperature setpoint. IOM 686 AGZ 030A through 065A...

  • Page 42: Soft Start

    Certain alarm conditions will not permit chiller pumpdown. These alarm conditions are: • High Condenser Pressure • Bad Evap Pressure Sensor • Compressor Motor Protect • Freezestat Alarm AGZ 030A through 065A IOM 686...

  • Page 43: Alarms

    Zone Terminal. If a circuit is off and the panel alarm light is not on, try depressing the Freezestat reset on the control panel. There is a five minute time delay after depressing the reset button. IOM 686 AGZ 030A through 065A...

  • Page 44: Zone Terminal (Optional)

    Flashing numbers to show which items are ZT adjustable • Flashing symbols to notify you of alarm conditions Capabilities With the ZT, you can: • Quickly identify a chiller alarm and its location • Monitor and adjust up to 18 different settings AGZ 030A through 065A IOM 686...

  • Page 45: Operating Modes

    Display 2 = Lvg Water SP Display 3 = % Unit Load This operating mode allows you to adjust any flashing setpoints. Setpoints adjusted by the ZT remain in effect until you change them. IOM 686 AGZ 030A through 065A...
  • Page 46 Pull the front cover of the ZT away from the back and slide the Insert into position. Press the ZT together. With the Insert in place and the ZT connected, the in the top position of each display lines up with the first word. Figure 22, Installing the Insert AGZ 030A through 065A IOM 686...
  • Page 47 Press Enter. After you press Enter, the numbers stop flashing for a few seconds. This pause tells you the ZT has processed your adjustment. Press any of the Display Buttons to make other adjustments, and repeat Steps 2 and 3. IOM 686 AGZ 030A through 065A...

  • Page 48: Zone Terminal Glossary

    SoftSta Capcty - Adjusts the ramping of steps from 0% - 100% (default is 50%). SoftStart Time - Adjustable ramping time from 0 - 20 minutes (default is 2 minutes). Cir #1 Starts - Counts the number of starts for circuit #1. AGZ 030A through 065A IOM 686...
  • Page 49 Compressor #1 - Compressor 1 is On or Off Compressor #2 - Compressor 2 is On or Off Stage 3 to 6 - Indicates how many additional compressor (or unloading) stages are on at the time. IOM 686 AGZ 030A through 065A...

  • Page 50: Global Unt Controller Troubleshooting Chart

    1. Check for reasons and correct. Unloading 2. System load erratic. 2. Check water flow control valve operation. 3. Bad water sensor. 3. Replace. 4. Reset function calibration. 4. Re-calibrate 5. Defective UNT controller. 5.Replace AGZ 030A through 065A IOM 686...

  • Page 51: Microtech Controller Installation And Operation

    Remote 4-20 milliamp signals Signals for leaving water reset or demand limit are provided by the installing contractor and connected to the terminal block as indicated by the unit wiring diagram. See Field Wiring diagram for details. IOM 686 AGZ 030A through 065A...

  • Page 52: Interlock Wiring

    An optional modem kit allowing remote monitoring of the chiller from an off-site PC running McQuay Monitor software is available from your local McQuay International sales representative. The modem kit comes complete with modem, mounting bracket, wiring harness, and installation instructions.

  • Page 53: Chilled Water Flow Switch

    The chilled water flow switch is connected to field wiring terminals #142 and #143 on TB-7. When the chilled water pump is enabled, the MicroTech controller checks for proof-of-flow through the flow switch digital input. IOM 686 AGZ 030A through 065A...
  • Page 54 Misc. Setup menu. The software “version” is the last three digits of the software identification code. Example of typical software identification: AGZ2E01A AGZ 030A through 065A IOM 686...
  • Page 55 The outputs are individually protected by a 5 amp fuse mounted on the output board adjacent to each relay. Table 20 provides additional information about each output. Refer to the MicroTech Staging schematic for digital output wiring. IOM 686 AGZ 030A through 065A...
  • Page 56 LvgEvapSpt = Desired Ice Temperature + 1/2 Control Band + Shut down Delta T Lvg EvapSpt = 21°F + 1/2 (4)°F + 1.5°F Lvg Evap Spt = 21°F + 2°F + 1.5°F Lvg Evap Spt = 24.5°F AGZ 030A through 065A IOM 686...
  • Page 57 SoftLdMaxStg: Determines the maximum number of cooling stages which may be energized while soft loading is in effect. • LoadDelay: The amount of time allowed for the controller to sample the loop water temperature before initiating cooling. IOM 686 AGZ 030A through 065A...

  • Page 58: Manual Operation

    The second fan will cycle on and off to maintain minimum lift pressure. If the condenser pressure increases rapidly, the second fan will be turned on at 290psig (R-22 setpoint) and remain on until minimum lift pressure regains control. AGZ 030A through 065A IOM 686...
  • Page 59 The chiller alarm condition corresponds with the RMS “fault” condition. Thus, there are system and circuit faults. Chiller pre- alarm conditions correspond to the RMS “problem” designation. Reciprocating chillers do not have warning alarms. IOM 686 AGZ 030A through 065A...

  • Page 60: Sequence Of Operation

    OFF:Remote Sw. The chiller may also be commanded off via the communications network if a separate System Master Panel is installed. The display will show OFF:Remote Comm if this operating mode is in effect. AGZ 030A through 065A IOM 686...
  • Page 61 As the evaporator pressure falls below the LPCutOut set point, the compressor and condenser fan will stop. The evaporator pump output relay will remain energized and the unit status will indicate “Waiting For Load”. IOM 686 AGZ 030A through 065A...

  • Page 62: Start-Up And Shutdown

    Move both pumpdown switches to the auto position. DH1-7 and DH2-15 will turn off. The controller will then activate one of the refrigerant circuit solenoids depending upon which is the lead circuit. (output relay #4 circuit #1or output relay #5 circuit #2) When the evaporator pressure rises AGZ 030A through 065A IOM 686...

  • Page 63: Keypad / Display

    If external water piping is heat traced, leave power on to heat tracing to protect from freezing. Keypad / Display Figure 24, Keypad / Display IOM 686 AGZ 030A through 065A...
  • Page 64 Any keypad activity will reset the timer for the full 5 minutes so the password only needs to be entered once per session. After 5 minutes of inactivity, the password access time will expire providing protection against unauthorized users. AGZ 030A through 065A IOM 686...
  • Page 65 N T E R N T E R Incr - When changing the value of a menu item entry, pressing “INCR. +” shifts the menu item display line to the next higher or next available selection. IOM 686 AGZ 030A through 065A...

  • Page 66: Menu Descriptions

    Menu #5: Circuit #l Pressures-The circuit #l evaporator and condenser refrigerant pressure readings are displayed under this menu. The calculated minimum and maximum condenser pressure values are also shown. AGZ 030A through 065A IOM 686...
  • Page 67 ("MaxChWRst"). At 4mA or less, no reset will occur. At 20mA, the chilled water set point will be reset to a value equaling the Leaving Evaporator Water Set Point ("Lvg Evap") plus the value stored in IOM 686 AGZ 030A through 065A...
  • Page 68 1, the unit will shut completely off once the leaving chilled water temperature has reached the Leaving Chilled Water Set Point minus half of the Control Band minus the Shut Down Delta-T. AGZ 030A through 065A IOM 686...
  • Page 69 The cursor will advance to the Date position on the display which can be set in the same manner. After pressing the Enter key to set the Date, the cursor will advance to the Year position on the display. Use the Incr, Decr, and Enter keys to set the correct Year. IOM 686 AGZ 030A through 065A...
  • Page 70 Menu #27: Circuit #2 Previous Alarm—The alarm type for the last recorded circuit #2 alarm may be displayed from this menu. The time and date at which the previous alarm occurred are also displayed here. This information will be replaced when a current alarm condition is cleared. AGZ 030A through 065A IOM 686...
  • Page 71 Cond xxx.x psi (kPa) xxx o PumpingDown Cond 450+ psi (kPa) xxx o OpenSolenoid % Capacity Open N/A ** F (C) Starting Short N/A **F MinCondPr = 0# MaxCondPr = 0# LowAmbStart LiftD_P= psi Cond Fan Stage = x IOM 686 AGZ 030A through 065A...
  • Page 72 N/A ** o F ( o C) Liquid Ln = xxx.x o F ( o C) N/A ** o F ( o C) SubCoolg= xxx.x o F ( o C) N/A ** o F ( o C) CondD-T °F (°C) AGZ 030A through 065A IOM 686...
  • Page 73 10.0 (5.5) 0.0 - 45.0 (0.0 - 25.0) ReturnSpt= xx.x o F ( o C) 54.0 (12.3) 15.0 - 80.0 (-9.4 - 26.7) [ ] the minus sign is not displayed with three digit numbers IOM 686 AGZ 030A through 065A...
  • Page 74 DemandSg= xx.x ma Actual Value Indicates the Magnitude of the Demand Limit Signal Table 42, MENU 19 Time / Date Screen Display Factory Setpoint Range Time= xx:xx:xx Actual Time Mon xx/xx/xx Actual Day and Date AGZ 030A through 065A IOM 686...
  • Page 75 4 - 26 (27 - 179) FreezH2O= xx.x o F ( o C) 36.0 (2.3) 0.0 - 40.0 (-17.5 - 4.5) FreezeTim= xxx sec Hi Press = xxxpsi (kPa) 380 (2622) 280 - 426 (1932 - 2939) IOM 686 AGZ 030A through 065A...
  • Page 76 Cond = x.x psi (kPa) 2 x:xx x/xx/xx SuctLine=xxx.x 3 Current Alarm LiquisLn=xxx.x 3 x:xx x/xx/xx Evap Lvg=xxx.x 4 Current Alarm OAT=xx.xx 4 x:xx x/xx/xx Capacity= xxx% 5 Current Alarm Fan Stage = x 5 x:xx x/xx/xx AGZ 030A through 065A IOM 686...

  • Page 77: Trouble Analysis For The Agz Microtech Controller

    MCB power supply circuit. Microprocessor Status LEDs The green, red, and amber LEDs on the MCB provide information about the operating status of the microprocessor. The amber LED also indicates the existence of alarm conditions. IOM 686 AGZ 030A through 065A...
  • Page 78 If a hex switch setting is changed, power to the MCB must be cycled in order to enter the new setting into memory. This can be done by turning the panel’s power switch off and then back on. AGZ 030A through 065A IOM 686...
  • Page 79 Above each edge card connector are field wiring terminals for 5 Vdc (regulated) and 24 Vac (ground referenced). These terminals can be used to power peripheral devices. The 5 Vdc is also used to power the LEDs in the Output Board. IOM 686 AGZ 030A through 065A...

  • Page 80: Test Procedures

    Reconnect the keypad/display ribbon cable . Cycle power to the controller and check the power fuses. If both fuses are intact, go to step 6. If either fuse blows, check the keypad/display and the connecting ribbon cable for shorts. Either one may be defective. AGZ 030A through 065A IOM 686...
  • Page 81 If the resistance does not rise above 5000 ohms, the modem or the AOX-4 board just connected is defective. (With the power plug disconnected, the resistance across an AOX-4 board’s “DC” and “G” terminals should not be less than 3 million ohms.) IOM 686 AGZ 030A through 065A...
  • Page 82 Remove power from the controller before disconnecting the suspect component, and restore power after connecting the replacement component. If the problem persists, it is likely that the MCB is defective. AGZ 030A through 065A IOM 686...
  • Page 83 MOVs are part of the output board and cannot be replaced. Following are troubleshooting procedures for various symptoms of output board problems Note: It should be possible to determine whether a solid-state relay is defective by using these procedures. IOM 686 AGZ 030A through 065A...
  • Page 84 If 5 Vdc is present, check the ribbon cable and connections between the output board and MCB. Look for bent pins. If the cable and connections are intact, the Output Board or the MCB is defective. AGZ 030A through 065A IOM 686...
  • Page 85 Try to choose a relay that will not affect unit operation. Restore power by closing CB1. If the chatter does not stop, go to step 3. If the chatter stops, the suspect relay is defective. Replace the relay. IOM 686 AGZ 030A through 065A...
  • Page 86 In this situation, an incandescent test lamp is a better tool than a voltmeter. Figure 30, Testing a Typical Relay Circuit Figure 31, Testing a Relay Circuit with a Disconnection 115 VAC 115 VAC Output Board Output Board DO 13 DO 13 Neutral Neutral 115V AGZ 030A through 065A IOM 686...
  • Page 87 Notes IOM 686 AGZ 030A through 065A...
  • Page 88 13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330...

This manual is also suitable for:

Agz 065aAgz 030asAgz 035asAgz 040asAgz 045asAgz 050as ... Show all

Table of Contents