Daikin McQuay AGZ-D 25 Operating And Maintenance Manual
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Daikin McQuay AGZ-D 25 Operating And Maintenance Manual

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Operating and Maintenance Manual
Air-Cooled Scroll Compressor Chiller
AGZ-D 25 to 190 Tons
50 - 60-Hertz, R-410A
Software Version 251699201
OMM 1087-1
Group: Chiller
Part Number: OMM 1087
Effective: August 2012
Supersedes: May 2012

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Summary of Contents for Daikin McQuay AGZ-D 25

  • Page 1 Operating and Maintenance Manual OMM 1087-1 Group: Chiller Part Number: OMM 1087 Effective: August 2012 Supersedes: May 2012 Air-Cooled Scroll Compressor Chiller AGZ-D 25 to 190 Tons 50 - 60-Hertz, R-410A Software Version 251699201...

  • Page 2: Table Of Contents

    Table of Contents Unit Warning Alarms ........38 Introduction ........3 Circuit Fault Alarms ........38 Operating/Standby Limits ......9 Circuit Events ..........40 Circuit Warning Alarms ......41 Pressure Drop Curves ......9 Events ..........41 MicroTech III Controller .....13 Unit Events ..........42 Controller Section Table of Contents ..

  • Page 3: Introduction

    Introduction General Description Daikin McQuay Air-Cooled Global Water Other features include compressor crankcase Chillers are complete, self-contained automatic heaters, an evaporator heater for chilled water refrigerating units. Every unit is completely freeze protection, , automatic compressor lead- assembled, factory wired, charged, and tested lag to alternate the compressor starting (except remote evaporator option).
  • Page 4 Variable water flow involves changing the A properly designed storage tank should be water flow through the evaporator as the load added if the system components do not provide changes. Daikin McQuay chillers are designed sufficient water volume. AGZ 025D through 190D OMM 1087-1...
  • Page 5 Glycol Solutions The use of a glycol/water mixture in the evaporator to prevent freezing reduces system capacity and efficiency, as well as increase pressure drop. The system capacity, required glycol solution flow rate, and pressure drop with glycol may be calculated using Table 1. 1.
  • Page 6 Table 4, Ethylene Glycol Factors for Models AGZ 140D to 190D Freeze Point % E.G. Capacity Power Flow -3.3 0.994 0.998 1.038 1.101 -7.8 0.982 0.995 1.063 1.224 -13.9 0.970 0.992 1.095 1.358 -21.7 0.955 0.987 1.134 1.536 -33.3 0.939 0.983 1.184 1.755...
  • Page 7 Table 6, Capacity and Power Derates, Models AGZ 025D to 130D Fouling Factor Chilled Water Delta Altitude 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308) °F °C Cap. Power Cap. Power Cap. Power Cap. Power 0.978 0.993 0.975 0.991 0.963 0.987 0.940 0.980...
  • Page 8 Table 7, Capacity and Power Derates, Models AGZ 140D to 190D Fouling Factor Chilled Water Delta T Altitude 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308) °F °C Cap. Power Cap. Power Cap. Power Cap. Power 0.990 0.997 0.976 0.994 0.937 0.983 0.868...

  • Page 9: Operating/Standby Limits

    automatic through the ambient sensing the evaporator is drained in the winter, the thermostat that energizes the evaporator heater disconnect switch to the evaporator heater cable for protection against freeze-up. Unless must not be open. Operating/Standby Limits • Maximum standby ambient air temperature, 130° F (55° C) •...
  • Page 10 Figure 1, Evaporator Pressure Drops. See following page for curve cross-reference See following page for curve cross-reference and min/max flow rates. AGZ Water Pressure Drop 1000 Flow Rate (gpm) AGZ 025D through 190D OMM 1087-1...
  • Page 11 Table 8, Curve Cross-Reference, Min/Nominal/Max Flows Minimum Flow Rate Nominal Flow Rate Maximum Flow Rate Curve Evaporator Inch-Pound S.I. Inch-Pound S.I. Inch-Pound S.I. Unit Ref. Type Model 025D 41.3 11.0 66.0 26.8 105.6 22.0 65.5 030D 47.4 14.3 75.8 11.7 34.9 121.3 28.6...
  • Page 12 Figure 2, Typical Field Control Wiring AGZ 025D through 190D OMM 1087-1...

  • Page 13: Microtech Iii Controller

    MicroTech III Controller Controller Section Table of Contents Overview ........................14 Controller Inputs and Outputs ..................14 Setpoints ........................16 Security ..........................20 Unit Control Functions ....................20 Unit Enable ........................21 Unit Mode Selection ......................22 Unit States ........................22 Start Delays ........................23 Evaporator Pump Control ....................24 Leaving Water Temperature (LWT) Reset/Target ............25 Unit Capacity Control ....................26 Unit Capacity Overrides……………………………………………………………….27...

  • Page 14: Overview

    Overview The MicroTech® III controller’s state-of-the-art design not only permits the chiller to run more efficiently, but also can simplify troubleshooting if a system failure occurs. Every MicroTech IIII controller is programmed and tested prior to shipment to facilitate start-up. Operator-friendly The MicroTech III controller menu structure is separated into three distinct categories that provide the operator or service technician with a full description of :...
  • Page 15 Table 12, Digital Outputs Description Output Off Output On Evaporator Water Pump 1 Pump Off Pump On Alarm Indicator Alarm Not Active Alarm Active Circuit 1 Fan Output 1 Fan(s) Off Fan(s) On Circuit 1 Fan Output 2 Fan(s) Off Fan(s) On Circuit 1 Fan Output 3 Fan(s) Off...

  • Page 16: Setpoints

    Digital Outputs Description Output Off Output On Compressor #2 Compressor Off Compressor On Compressor #4 Compressor Off Compressor On Compressor #6 Compressor Off Compressor On Circuit 2 Hot Gas Bypass SV Solenoid Closed Solenoid Open Circuit 2 Liquid Line SV Solenoid Closed Solenoid Open EXV Module 1 and 2...
  • Page 17 Unit Level Setpoints: Description Default Range Mode/Enabling Unit Enable Enable Disable, Enable Network Unit Enable Disable Disable, Enable Control source Local Local, Network Cool, Cool w/Glycol, Cool/Ice w/Glycol Available Modes Cool Ice, Test Network Mode Command Cool Cool, Ice Staging and Capacity Control Cool LWT 1 7°C (44.6°F) See Auto Adjusted Ranges, page 18...
  • Page 18 Description Default Range High Condenser Pressure Unload 4137 KPA(600 PSI) 3241 to 4137 KPA (470 to 600 PSI) Evaporator Flow Proof 5 sec 5 to 15 sec Recirculate Timeout 3 min 1 to 10 min Evaporator Water Freeze 2.2°C (36°F) See Auto Adjusted Ranges, page 18 Low OAT Start Time 165 sec...
  • Page 19 Cool LWT 1, Cool LWT 2, and Network Cool Set Point Available Mode Selection Range Without Glycol 4.4 to 15.6 °C (39.9 to 60.1 °F) With Glycol -9.5 to 15.6 °C (14.9 to 60.1 °F) Evaporator Water Freeze Available Mode Selection Range Without Glycol 2.2 to 5.6 °C (36 to 42.1 °F)

  • Page 20: Security

    Security All setpoints are protected using passwords. A four-digit password provides operator access to changeable parameters. Service level passwords are reserved for authorized service personnel. . Operator password: 5321 Entering Passwords Passwords are entered on the first screen on the unit controller, If the wrong password is entered, a message will temporarily appear stating this.

  • Page 21: Unit Enable

    • Stage Up temperature = LWT target + Unit Capacity Control Band – (LWT target – 3.9°C) For applying unit capacity limits, an estimate of If the unit is configured for use with glycol, the total unit capacity is needed. Unit capacity will be compressor staging temperatures are calculated as based on the estimated circuit capacities.

  • Page 22: Unit Mode Selection

    Unit Mode Selection The operating mode of the unit is determined by request switches between cool mode and ice mode setpoints and inputs to the chiller. The Available if they are both available and the control source is Modes Set Point determines what modes of set to ‘network.’...

  • Page 23: Power Up Start Delay

    T1 - Off to Auto All of the following are required: • Unit Enable = On • No Unit Alarm • A circuit is enabled to start • If Unit Mode = Ice then Ice Delay not active T2 - Auto to Pumpdown Any of the following are required: •...

  • Page 24: Evaporator Pump Control

    Enum Status Conditions Off:Keypad Disable Unit State = Off and Unit Enable Set Point = Disable Off:Remote Switch Unit State = Off and Remote Switch is open Unit State = Off, Control Source = Network, and BAS Enable = Off:BAS Disable false Off:Unit Switch Unit State = Off and Unit Switch = Disable...

  • Page 25: Lwt Target

    T3 – Run to Off Requires all of the following • Unit state is Off • LWT is higher than the Evap Freeze set point or LWT sensor fault is active T4 – Start to Off Requires all of the following •...

  • Page 26: Unit Capacity Control

    Local COOL/ICE Cool Set Point 1 w/Glycol Local COOL/ICE Ice Set Point w/Glycol Network COOL COOL/ICE BAS Cool Set Point w/Glycol Network COOL/ICE BAS Ice Set Point w/Glycol Local ICE w/Glycol Ice Set Point Network ICE w/Glycol BAS Ice Set Point Leaving Water Temperature (LWT) Reset The base LWT target may be reset if the unit is in Cool mode and LWT reset is enabled via the set point.

  • Page 27: Unit Capacity Overrides

    Additional compressors should be started as quickly as possible with respect to the Stage Up Delay. The unit should shut down when evaporator LWT is less than the LWT target. Stage Up Delay A fixed stage up delay of one minute between compressor starts should be used in this mode. Staging Sequence This section defines which compressor is the next one to start or stop.
  • Page 28 Six Compressors: Demand Limit Signal (%) Demand Limit (mA) Stage Limit Limit ≥ 83.3% Limit ≥ 17.3 mA 83.3% > Limit ≥ 66.7% 17.3 mA > Limit ≥ 14.7 mA 66.7% > Limit ≥ 50% 14.7 mA > Limit ≥ 12mA 50% >...

  • Page 29: Circuit Functions

    Circuit Functions Definitions Refrigerant Saturated Temperature • Refrigerant saturated temperature shall be calculated from the pressure sensor readings for each circuit. Evaporator Approach The evaporator approach shall be calculated for each circuit. The equation is as follows: Evaporator Approach = LWT – Evaporator Saturated Temperature Condenser Approach The condenser approach shall be calculated for each circuit.
  • Page 30 Transitions between these states are shown in the following diagram. POWER PREOPEN PUMPDOWN T1 – Off to Preopen • No compressors are running and any compressor on circuit is commanded to start (see unit capacity control) • T2 – Preopen to Run •...

  • Page 31: Pumpdown Procedure

    and unload alarms are disabled. The absolute limit Pumpdown Procedure for low evaporator pressure is enforced and the Pumpdown is performed as follows: low evaporator pressure alarm should trigger if the evaporator pressure drops below that limit. • If multiple compressors are running, shut off When the Low OAT Start Timer has expired, if the appropriate compressors based on the evaporator pressure is greater than or equal to...

  • Page 32: Condenser Fan Control

    Starting a Compressor A compressor should start if it receives a start command from the unit capacity control logic. Stopping a Compressor A compressor should be turned off if any of the following occur: • Unit capacity control logic commands it off •...
  • Page 33 Condenser Target A condenser target should be selected from the respective dead bands. Stages five through seven setpoints based on the number of compressors on should all use Stage Down Dead Band 4. the unit and the number of compressors running. When saturated condenser...

  • Page 34: Exv Control

    EXV Control Auto Control Any time the circuit is not in the run state, the Evaporator Pressure set point. This is done by EXV position should be 0. The EXV control state using another PID function to control evaporator should display that the EXV state is closed when pressure to the maximum evaporator pressure.

  • Page 35: Liquid Line Solenoid Valve

    keep the circuit from entering a condition in which Liquid Line Solenoid Valve it is not designed to run. The liquid line solenoid output should be on when Low Evaporator Pressure the circuit state is either Pre-open or Run. This If the Low Evaporator Pressure Hold or Low output should be off at all other times.
  • Page 36 For the auto reset occurrences, the alarm will reset automatically when the evaporator state is Run again. This means the alarm stays active while the unit waits for flow, then it goes through the recirculation process after flow is detected. Once the recirculation is complete, the evaporator goes to the Run state which will clear the alarm.

  • Page 37: Unit Problem Alarms

    Reset: This alarm can be cleared manually via the keypad or BAS command when communication between main controller and the extension module is working for 5 seconds. EXV Module 1 Comm Failure Trigger: Expansion Valve Type = Electronic and communication with the I/O extension module has failed. Action Taken: Rapid stop of circuit 1.

  • Page 38: Unit Warning Alarms

    Unit Warning Alarms External Event Trigger: External Alarm/Event input is open for at least 5 seconds and external fault is configured as an event. Action Taken: None Reset: Auto clear when digital input is closed. Bad Demand Limit Input Trigger: Demand limit input out of range and demand limit is enabled. For this alarm out of range is considered to be a signal less than 3mA or more than 21mA.
  • Page 39 Freezestat logic allows the circuit to run for varying times at low pressures. The lower the pressure, the shorter the time the compressor can run. This time is calculated as follows: Freeze error = Low Evaporator Pressure Unload – Evaporator Pressure Freeze time = For units equipped with 10 or more condenser fans (shell and tube type evaporator): 80 –...

  • Page 40: Circuit Events

    No Pressure Change After Start Trigger: After start of compressor, at least a 7 KPA (1 PSI) drop in evaporator pressure OR 35 KPA (5.1 PSI) increase in condenser pressure has not occurred after 30 seconds. The actual alarm will not be triggered until the second occurrence.

  • Page 41: Circuit Warning Alarms

    Low Evaporator Pressure - Unload Trigger: This event is triggered if all of the following are true: • circuit state = Run • more than one compressor is running on the circuit • evaporator pressure <= Low Evaporator Pressure - Unload set point for a time greater than half of the current freezestat time •...

  • Page 42: Unit Events

    Unit Events Unit Power Restore Trigger: Unit controller is powered up. Action Taken: none. Reset: none. Circuit Events Low Evaporator Pressure - Hold Trigger: This event is triggered if all of the following are true: • circuit state = Run •...

  • Page 43: Clearing Alarms

    Action Taken: Stage off one compressor on the circuit every 10 seconds while condenser pressure is higher than the unload set point, except the last one. Inhibit staging more compressors on until the condition resets. Reset: While still running, the event will be reset if condenser pressure <= High Condenser Pressure Unload SP –...

  • Page 44: Using The Controller

    Using the Controller Figure 3, Unit Controller Alarm Button Menu Button Navigation Wheel Return Button Display The keypad/display consists of a 5-line by 22-character display, three buttons (keys) and a “push and roll” navigation wheel. There is an Alarm Button, Menu (Home) Button, and a Back Button. The wheel is used to navigate between lines on a screen (page) and to increase and decrease changeable values when editing.

  • Page 45: Navigating

    When the cursor is on a line the highlights will look like this: Evaporator Delta T= 10.0F If line contains a changeable value> If the line contains status-only information> Unit Status= Or a line in a menu may be a link to further menus. This is often referred to as a jump line, >...
  • Page 46 Navigation Mode When the navigation wheel is turned clockwise, the cursor moves to the next line (down) on the page. When the wheel is turned counter-clockwise the cursor moves to the previous line (up) on the page. The faster the wheel is turned the faster the cursor moves. Pushing the wheel acts as an “Enter”...

  • Page 47: Menus

    Example 3; Clear an Alarm, from the Main Menu scroll down to the Alarms line. Note the arrow indicating this line is a link. Press the wheel to jump to the next menu Alarms There are two lines here; Alarm Active and Alarm Log. Alarms are cleared from the Active Alarm link. Press the wheel to jump to the next screen.
  • Page 48 Screen U-2 From Screen U-1 Enter Password No password Operator Links to screen Enter PW Screen U-3 From Screen U-1 Quick Menu No password Operator Links to screen Unit Status Active Setpoint Evap Leaving Water Temp Evap Entering Water Temp Unit Capacity Network Limit Value Demand Limit Value...
  • Page 49 Screen U-6 From Screen U-1 Time Until Restart No password Operator Links to screen Compressor 4 Cycle Time Remaining Compressor 5 Cycle Time Remaining Compressor 6 Cycle Time Remaining Clear Cycle Timers Screen U-7 From Screen U-1 Alarms No password Operator Links to screen Alarm Active...
  • Page 50 From Screen U-1 Screen U-11 Commission Unit No password Operator Links to screen Modbus Setup U-21 AWM Setup U-22 Ctrlr IP Setup U-24 Alarm Active U-30 Alarm Log U-31 Scheduled Maintenance Manual Control Unit U-34 Manual Control Circuit 1 Cx-3 Manual Control Circuit 2 Cx-3 Screen U-12...
  • Page 51 Screen U-14 From Screen U-4, U11 Set-Up No password Operator Links to screen Available Modes Start Up DT Shut Down DT Max Pulldown Rate Stage Up Delay Stage Down Delay Start To Start Delay Stop To Start Delay Ice Cycle Delay External Fault Config Display Units Screen U-15...
  • Page 52 Screen U-18 From Screen U-4, U-11 LON Setup No password Operator Links to screen Neuron ID Max Send Time Min Send Time Receive Heartbeat LON BSP LON App Version Screen U-19 From Screen U-4, U-11 BACnet IP Setup No password Operator Links to screen Apply Changes...
  • Page 53 Screen U-21 From Screen U-4, U-11 Modbus Setup No password Operator Links to screen Response Delay Comm LED Time Out Modbus BSP Screen U-22 From Screen U-4, U-11 AWM Setup No password Operator Links to screen Apply Changes DHCP Actual IP Address Actual Mask Actual Gateway Given IP Address...
  • Page 54 Screen U-25 From Screen U-4 Design Conditions No password Operator Links to screen Screen U-25 From Screen U-4 Design Conditions No password Operator Links to screen Cond Design Approach Unit Full Load Efficiency Unit Integrated Part Load Value Rated Capacity Screen U-26 From Screen U-4, U-11 Alarm Limits...
  • Page 55 Alarm Active No password Operator Links to screen Active Count Alarm Clear Active Alarm 1 … Active Alarm n Screen U-31 From Screen U-7, U-9, U-11 Alarm Log No password Operator Links to screen Log Count Log Clear Active Alarm 1 …...
  • Page 56 Unit Manual Control No password Operator Links to screen LWT Reset Signal Current Demand Limit Signal Current Unit Alarm Output State Evaporator Pump 1 Output State Evaporator Pump 2 Output State Screen U-35 From Screen U-11 Calibrate Circuit Sensors No password Operator Links to screen Circuit #1...
  • Page 57 Circuit x Status/Settings No password Operator Links to screen Evap Leaving Water Temp Evap Entering Water Temp Evap Approach Evap Approach @ Design Evaporator Pressure Evaporator Saturated Temperature Condenser Pressure Condenser Saturated Temperature Suction Temperature Suction Superheat Compressor 1/2 Run Hours Number Of Starts Last Compressor Start Last Compressor Stop...
  • Page 58 Circuit x Manual Control No password Operator Links to screen Test Fan Output 2 Test Fan Output 3 Test Fan Output 4 Test Fan Output 5 Test Fan VFD Speed Input/Output Values Circuit Switch Input State MHP Switch Input State Motor Protector Input State PVM/GFP Input State Evaporator Pressure Input Voltage...
  • Page 59 Condenser No password Operator Links to screen Number of Fans Running Number of Fans Stage Up Error Stage Down Error Condenser Sat Temp Condenser Target VFD Target VFD Speed Stage On Dead Band 1 Stage On Dead Band 2 Stage On Dead Band 3 Stage On Dead Band 4 Stage Off Dead Band 1 Stage Off Dead Band 2...

  • Page 60: Optional Low Ambient Fan Vfd

    Optional Low Ambient Fan VFD The optional VFD fan control is used for unit operation below 35°F (2°C) down to a minimum of -10°F (-23°C). The control looks at the saturated discharge temperature and varies the fan speed to hold the temperature (pressure) at the “target”...

  • Page 61: Vfd Interface (Hmi)

    VFD Interface (HMI) The HMI is located in the lower left-hand corner of the unit control panel. It is used to view data including fault and alarm information. No operator intervention on this control is required for normal unit operation. Table 14, Display Key Functions Table 15, Display Key Functions Display...
  • Page 62 LCD Display Table 16, Display Data Name Display Content Displayed when in Mode Selection. MODE Displayed when in Monitor Mode. MONITR VERIFY Indicates the Verify Menu Operation Mode Menus PRMSET Displayed when in Parameter Setting Mode. A.TUNE Displayed during Auto-Tuning. SETUP Displayed when in Setup Mode.
  • Page 63 Table 17, Alarm Content State Content Display Illuminated When the drive detects an alarm or error When an alarm occurs Flashing When an oPE is detected When a fault or error occurs during Auto-Tuning Normal operation (no fault or alarm) Table 18, LO/RE LED and RUN LED Indictors Flashing Slowly Flashing Quickly...
  • Page 64 Table 19, Types of Alarms, Faults, and Errors Type Drive Response When the drive detects a fault: • The digital operator displays text indicating the specific fault and the ALM indicator LED remains lit until the fault is reset. • The fault interrupts drive output and the motor coasts to a stop. • Some faults allow the user to select the stopping Faults method when the fault occurs.

  • Page 65: Recommended Periodic Inspection

    Recommended Periodic Inspection WARNING Electrical Shock Hazard. Before servicing or inspection equipment, disconnect power to the unit.The internal capacitor remains charged after power is turned off. Wait at least the amount of time specified on the drive before touching any components. Table 21, Periodic Inspection Checklist Inspection Area Inspection Points...

  • Page 66: Startup

    Startup Pre Start-up The chiller must be inspected to ensure no components became loose or damaged during shipping or installation. Start-Up Refer to the MicroTech III Controller section beginning on page 13 to become familiar with its operation before starting chiller. There should be adequate building load (at least 50 percent of the unit full load capacity) to properly check the operation of the chiller refrigerant circuits.
  • Page 67 Extended 1. Front seat (close) both condenser liquid line service valves. 2. Put both circuit switches (PS1 and PS2) to the OFF position (Pumpdown and Stop position). 3. After the compressors have stopped, put System Switch (SW1) to the OFF position (emergency stop).

  • Page 68: Operation

    3. Put System Switch (S1) to the Emergency Stop position. 4. Put both circuit #1 & #2 switches to the Pumpdown and Stop position. 5. Apply power to the unit. The panel Alarm Light will stay on until S1 is closed. Ignore the Alarm Light for the check out period.
  • Page 69 Filter-Driers Each refrigerant circuit is furnished with a full flow filter drier (AGZ 030C – 100C) or a replaceable core type filter-drier (AGZ 140C – 180C). The core assembly of the replaceable core drier consists of a filter core held tightly in the shell in a manner that allows full flow without bypass. Pressure drop across the filter drier at full load conditions must not exceed 10 psig at full load.
  • Page 70 Evaporator Models AGZ 025C through 130C The evaporator is a compact, high efficiency, dual circuit, brazed, plate-to-plate type heat exchanger consisting of parallel stainless steel plates. The evaporator is protected with an electric resistance heater and insulated with 3/4" (19mm) thick closed-cell polyurethane insulation.

  • Page 72: Unit Maintenance

    Unit Maintenance coil cleaners available at most air conditioning General supply outlets. Use caution when applying On initial start-up and periodically during such cleaners as they can contain potentially operation, it will be necessary to perform harmful chemicals. Care should be taken not to certain routine service checks.

  • Page 73: Planned Maintenance Schedule

    Liquid Line Sight Glass The refrigerant sight glasses should be Table 22 on page 78 for maximum allowable pressure drops. If subcooling is low, add PERCENT MAXIMUM RECOMMENDED charge to clear the sight glass. If subcooling is CIRCUIT PRESSUREDROP ACROSS normal (15 to 20 degrees F) and flashing is FILTER DRIER PSIG (KPA) LOADING (%)
  • Page 74 Monthly operations include all weekly operations. Annual (or spring start-up) operations includes all weekly and monthly operations. Log readings can be taken daily for a higher level of unit observation. Coil cleaning can be required more frequently in areas with a high level of airborne particles. Be sure fan motors are electrically locked out.

  • Page 75: Service

    Service R-410A Refrigerant Terminology Avoid rough handling of cylinders and secure as appropriate. Cap when not in use. Bubble Point: The temperature/pressure where bubbles first appear when heat is added Do not overfill recovery cylinders or to a liquid refrigerant. Used to measure sub- overcharge units.

  • Page 76: Refrigerant Charging

    certain polymers (e.g. PVC/CPVC and refrigerant leaks. Soap works well to show polycarbonate piping) bubbles at medium size leaks but electronic leak detectors are needed to locate small leaks. Use only the manufacturer’s recommended oil. Charging or check valves should always be Use only new sealed metal containers of oil to used on charging hoses to limit refrigerant loss insure quality.
  • Page 77 have liquid leave the cylinder and vapor enter R-410A compressor internal relief is 600-650 the compressor. psid. Overcharging of refrigerant will raise the Brazed connections only. No StayBrite or compressor discharge pressure due to filling of solder connections (solder should never be the condenser tubes with excess refrigerant.
  • Page 78 Table 22, Filter-Drier Pressure Drop MAXIMUM RECOMMENDED PERCENT CIRCUIT PRESSUREDROP ACROSS LOADING (%) FILTER DRIER PSIG (KPA) 100% 10 (69) 8 (55.2) 5 (34.5) 4 (27.6) AGZ 025D through 190D OMM 1087-1...

  • Page 79: Evaporator

    The solenoid coil can be removed from the Liquid Line Solenoid Valve valve body without opening the refrigerant piping after pumpdown. For personal safety, The liquid line solenoid valves that shut off refrigerant flow in the event of a power failure shut off and lock out the unit power.

  • Page 80: Agz-D Troubleshooting Chart

    AGZ-D Troubleshooting Chart PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS Main switch. Close switch. Check electrical circuits and motor windings for shorts or grounds. Investigate for possible overloading. Fuse blown. circuit breakers open Replace fuse or reset breakers after fault is corrected. Check for loose or corroded connections.

  • Page 82: Warranty Statement

    Replace compressor . Warranty Statement Limited Warranty All Daikin McQuay equipment is sold pursuant to standard McQuay International Terms and Conditions of Sale and Limited Product Warranty. Consult your local Daikin McQuay Representative for warranty details. Refer to form 933-430285Y-00-A (09/08). To find your...
  • Page 84 Now that you have made an investment in modern, efficient Daikin McQuay equipment, its care should be a high priority. For training information on all Daikin McQuay HVAC products, please visit us at www.daikinmcquay.com/training, or call 540-248-9646 to speak with the Training Department.

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