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74

AGZ 025D through 190D

OMM 1166-1

Liquid Line Sight Glass

The refrigerant sight glasses should be
observed periodically (a weekly observation
should be adequate.) A clear glass of liquid
indicates that there is subcooled refrigerant
charge in the system. Bubbling refrigerant in
the sight glass, during stable run conditions,
indicates that the system can be short of
refrigerant charge. Refrigerant gas flashing in
the sight glass could also indicate an excessive
pressure drop in the liquid line, possibly due to
a clogged filter-drier or a restriction elsewhere
in the liquid line.

See Table 22 on page 77 for maximum
allowable pressure drops. If subcooling is low,

add charge to clear the sight glass. If
subcooling is normal (15 to 20 degrees F) and
flashing is visible in the sight glass, check the
pressure drop across the filter-drier.
Subcooling should be checked at full load with
70



F (21.1



C) ambient temperature, stable

conditions, and all fans running.

An element inside the sight glass indicates the
moisture condition corresponding to a given
element color. If the sight glass does not
indicate a dry condition after about 12 hours of
operation, the circuit should be pumped down
and the filter-drier changed or verify moisture
content by performing an acid test on the
compressor oil.

Planned Maintenance Schedule

OPERATION

WEEKLY

MONTHLY

(Note 1)

ANNUAL

(Note 2)

General

Complete unit log and review (Note 3)

X

Visually inspect unit for loose or damaged components

X

Inspect thermal insulation for integrity

X

Clean and paint as required

X

Electrical

Check terminals for tightness, tighten as necessary

X

Clean control panel interior

X

Visually inspect components for signs of overheating

X

Verify compressor heater operation

X

Test and calibrate equipment protection and operating
controls

X

Megger compressor motor

*

X

Refrigeration

Leak test

X

Check sight glasses for clear flow

X

Check filter-drier pressure drop (see manual for spec)

X

Perform compressor vibration test

X

Acid test oil sample

X

Condenser (air-cooled)

Clean condenser coils (Note 4)

X

Check fan blades for tightness on shaft (Note 5)

X

Check fans for loose rivets and cracks

X

Check coil fins for damage

X

Notes:

1.

Monthly operations include all weekly operations.

2.

Annual (or spring start-up) operations includes all weekly and monthly operations.

3.

Log readings can be taken daily for a higher level of unit observation.

4.

Coil cleaning can be required more frequently in areas with a high level of airborne particles.

5.

Be sure fan motors are electrically locked out.

* Never Megger motors while they are in a vacuum to avoid damage to the motor.

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Содержание AGZ 190D

Страница 1: ...ance Manual OMM 1166 1 Group Chiller Part No OMM1166 1 Effective March 2014 Air Cooled Scroll Compressor Chiller AGZ025D AGZ190D Rev 0A 25 to 190 Tons 50 60 Hertz R 410A Software Version 251699201 201...

Страница 2: ...Bypass Solenoid Valve 35 Capacity Overrides Limits of Operation 35 Alarms 35 Unit Fault Alarms 35 Unit Problem Alarms 37 Unit Warning Alarms 38 Circuit Fault Alarms 38 Circuit Events 40 Circuit Warnin...

Страница 3: ...res include compressor crankcase heaters an evaporator heater for chilled water freeze protection automatic compressor lead lag to alternate the compressor starting sequence and sequenced starting of...

Страница 4: ...lves changing the water flow through the evaporator as the load changes Daikin Applied chillers are designed for this duty provided that the rate of change in water flow is slow and the minimum and ma...

Страница 5: ...glycol from the freezing point tables below It is recommended that a minimum of 25 solution by weight be used for protection against corrosion or that additional compatible inhibitors be added Concent...

Страница 6: ...han sea level refer to Table 6 and Table 7 Evaporator Temperature Drop Factors Performance tables are based on a 10 F 5 C temperature drop through the evaporator Adjustment factors for applications wi...

Страница 7: ...10 5 6 0 998 1 009 0 995 1 007 0 982 1 003 0 959 0 996 12 6 7 1 007 1 011 1 004 1 010 0 991 1 006 0 967 0 998 14 7 7 1 014 1 014 1 011 1 013 0 998 1 009 0 974 1 001 16 8 9 1 022 1 016 1 018 1 014 1 00...

Страница 8: ...025 0 949 1 014 0 879 0 995 16 8 9 1 006 1 031 0 992 1 027 0 952 1 016 0 882 0 996 8000 feet 6 3 3 0 979 1 034 0 966 1 031 0 927 1 019 0 859 1 000 8 4 4 0 984 1 036 0 971 1 032 0 932 1 021 0 863 1 002...

Страница 9: ...er controller operation The software setting of Variable Evap Flow equals YES or NO is located just below the Full Cap D T setting screen The Full Cap D T setting will continue to allow settings from...

Страница 10: ...d for each unit Occasionally the same evaporator is used on multiple units resulting in overlapping lines The nominal and maximum flow and pressure drop are the same for a given unit size regardless o...

Страница 11: ...3 15 3 134 6 12 5 8 5 37 3 224 3 33 0 14 2 98 6 065D I 55 8 1 9 3 5 5 8 87 1 4 5 5 5 13 4 139 4 11 0 8 8 32 8 232 3 29 0 14 7 86 7 070D J 61 5 2 3 3 9 7 0 96 1 5 4 6 1 16 3 153 8 13 3 9 7 39 7 256 3 3...

Страница 12: ...12 AGZ 025D through 190D OMM 1166 1 Figure 2 Typical Field Control Wiring...

Страница 13: ...election 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 Circuit Control Functions 29 Cir...

Страница 14: ...n memory and can be easily displayed in plain English for operator review The MicroTech III chiller controller will also retain and display the date time the fault occurred In addition to displaying a...

Страница 15: ...it Enable X7 Circuit 1 MHP Switch Fault No fault X8 Circuit 1 Motor Protection Fault No fault DI1 Circuit 1 or Unit PVM GFP Fault No fault Digital Outputs Description Output Off Output On DO1 Compress...

Страница 16: ...Coil 1 M2 M2 EXV Stepper Coil 2 Sensor Information Temperature All temperature sensors will be Daikin Applied part number 1934146 Pressure Pressure inputs will be read using 0 to 5 volt ratiometric s...

Страница 17: ...0 2 to 4 9 F min Nominal Evap Delta T 5 6 C 10 1 F 3 3 to 8 9 C 5 9 to 16 F Demand Limit Enable Off Off On Network Capacity Limit 100 0 to 100 LWT Reset Enable Off Off On Configuration Power Input Sin...

Страница 18: ...l Auto Auto manual EXV position See Special Setpoints page 19 0 to 100 Suction SH Target 5 56 C 10 F 4 44 to 6 67 C 8 to 12 F Max Evap Pressure 1076 KPA 156 1 PSI 979 to 1172 KPA 142 to 170 PSI Conden...

Страница 19: ...orator Pressure Hold and Unload Available Mode Selection Range Without Glycol 669 to 793 KPA 97 to 115 PSI With Glycol 407 to 793 KPA 59 to 115 PSI Special Set Point Operations The following setpoints...

Страница 20: ...roller setpoints may be changed If the operator attempts to edit a setpoint for which the necessary password level is not active no action will be taken Once a password has been entered it remains val...

Страница 21: ...ature LWT target Control Band LWT target 3 9 C If the unit is configured for use with glycol the compressor staging temperatures are calculated as shown below Stage Up Temperature LWT target Control B...

Страница 22: ...changing modes of operation inadvertently while the chiller is running Unit Mode is set according to the following table Control Source Set Point Mode Input BAS Request Available Modes Set Point Unit...

Страница 23: ...avoid tripping a false alarm Ice Mode Start Delay An adjustable start to start ice delay timer will limit the frequency with which the chiller may start in Ice mode The timer starts when the first com...

Страница 24: ...o max pulldown rate has been met or exceeded 16 Auto Unit Cap Limit Unit State Auto unit capacity limit has been met or exceeded 17 Auto High Ambient Limit 18 Config Changed Reboot Required A configur...

Страница 25: ...e greater than the recirculate timeout set point and there is no flow then the primary pump will shut off and the standby pump will start When the evaporator is in the run state if flow is lost for mo...

Страница 26: ...performed as described in this section All unit capacity limits described in following sections must be applied as described Compressor Staging in Cool Mode The first compressor on the unit should be...

Страница 27: ...compressors running the next compressor to start will be on the circuit with the least compressors running if it has at least one compressor available to start Within that circuit the available compr...

Страница 28: ...75 3 75 Limit 50 2 50 Limit 1 Six compressors Network Limit Stage Limit Limit 100 6 100 Limit 83 3 5 83 3 Limit 66 7 4 66 7 Limit 50 3 50 Limit 33 3 2 33 3 Limit 1 Maximum LWT Pulldown Rate The maxim...

Страница 29: ...ow Evaporator Pressure Unload set point The equation is as follows Pumpdown pressure Low Evap Pressure Unload set point 103KPA 15 PSI Circuit Control Logic Circuit Enabling A circuit should be enabled...

Страница 30: ...commanded to stop Unit State Pumpdown Circuit switch is open Circuit mode is disable Circuit Pumpdown alarm is active T4 Pumpdown to Off Any of the following are required Evaporator Pressure Pumpdown...

Страница 31: ...hutdown Multiple Low Ambient Start attempts are allowed On the third failed Low Ambient Start attempt the Restart Alarm is triggered and the circuit will not attempt to restart until the Restart alarm...

Страница 32: ...ling of power to the chiller This means that if power is cycled the cycle timers should not be active These timers may be cleared via a setting on the human machine interface HMI Condenser Fan Control...

Страница 33: ...one through four should use their respective dead bands Stages five through seven should all use Stage Down Dead Band 4 When the saturated condenser refrigerant temperature is below the target the act...

Страница 34: ...ll and tube type evaporator When staging down a compressor the maximum position is reduced by 10 for one minute to prevent liquid from getting to compressors After this initial one minute delay the va...

Страница 35: ...arms are classified in the following sections per the Global Chiller Protocol Standard using the Fault Problem Warning scheme When any Unit Fault Alarm is active the alarm digital output should be tur...

Страница 36: ...conditions no longer exist Evaporator LWT Sensor Fault Trigger Sensor shorted or open Action Taken Normal stop all circuits Reset This alarm can be cleared manually via the keypad or BAS command but o...

Страница 37: ...e keypad or BAS command when communication between main controller and the extension module is working for 5 seconds or Expansion Valve Type Thermal Unit Problem Alarms Low Ambient Lockout No longer a...

Страница 38: ...reset is enabled For this alarm out of range is considered to be a signal less than 3mA or more than 21mA Action Taken Cannot use LWT reset function Reset Auto clear when LWT reset is disabled or LWT...

Страница 39: ...he evaporator pressure sensor fault is active Action Taken Rapid stop circuit Reset This alarm can be cleared manually via the keypad if the evaporator pressure is above 137 9 KPA 20 PSI High Condense...

Страница 40: ...s alarm can be cleared manually via the keypad or BAS command but only if the sensor is back in range Suction Temperature Sensor Fault Trigger Sensor shorted or open and Expansion Valve Type Electroni...

Страница 41: ...if the circuit is no longer in the run state High Condenser Pressure Unload Trigger This event is triggered if all of the following are true circuit state Run more than one compressor is running on th...

Страница 42: ...porator Pressure Unload set point for a time greater than half of the current freezestat time circuit is not currently in a low OAT start it has been at least 30 seconds since a compressor has started...

Страница 43: ...m log 3 Event Log An Event Log similar to the Alarm Log stores the last 50 event occurrences Each Event Log entry includes an event description and a time and date stamp for the event occurrence plus...

Страница 44: ...ins a menu title a parameter such as a value or a setpoint or a link which will have an arrow in the right of the line to a further menu The first line visible on each display includes the menu title...

Страница 45: ...h can also be accessed by pressing the Menu Button The navigating wheel is the only navigating device necessary although the MENU ALARM and BACK buttons can provide shortcuts as explained later Passwo...

Страница 46: ...the wheel again cause the new value to be saved and the keypad display to leave the edit mode and return to the navigation mode A parameter with an R is read only it is giving a value or description...

Страница 47: ...creen the linked screen is indicated in the rightmost column Example the Enter Password screen links to screen U 2 For each screen the screen s from which you can navigate to it is also shown on the s...

Страница 48: ...3 Set Up R U 14 Temperatures R U 15 Date Time Schedules R U 16 Power Conservation R U 17 LON Setup R U 18 BACnet IP Setup R U 19 BACnet MSTP Setup R U 20 Modbus Setup R U 21 AWM Setup R U 22 Configura...

Страница 49: ...ervice Support Reference R R Screen U 9 From Screen U 1 Review Operation No password Operator Links to screen Alarm Active U 30 Alarm Log U 31 Unit Status Settings U 33 Circuit 1 Status Settings Cx 2...

Страница 50: ...sion R R Application Version R R HMI GUID R R OBH GUID R R Screen U 13 From Screen U 4 Status Settings No password Operator Links to screen Unit Status R Next Compressor On R Next Compressor Off R Chi...

Страница 51: ...elta T R Active Set Point R Start Up Temperature R Shut Down Temperature R Stage Up Temperature R Stage Down Temperature R Pulldown Rate Outside Air Temperature R Cool LWT Setpoint 1 R W Cool LWT Setp...

Страница 52: ...sk R Actual Gateway R Given IP Address R W Given Mask R W Given Gateway R W Unit Support R W NC Dev 1 R W NC Dev 2 R W BACnet BSP R Screen U 20 From Screen U 4 U 11 BACnet MSTP Setup No password Opera...

Страница 53: ...ssword Operator Links to screen Apply Changes Number Of Compressors Expansion Valve Type Number Of Fans Fan VFD Enable Power Configuration Comm Module 1 Type Comm Module 2 Type Comm Module 3 Type Scre...

Страница 54: ...etpoint High Pressure Shutdown Setpoint Low Ambient Start Time Evaporator Water Freeze Evaporator Flow Proof Evap Recirculate Timeout Screen U 27 From Screen U 4 U 11 Calibrate Sensors No password Ope...

Страница 55: ...U 38 Screen U 33 From Screen U 9 Unit Status Settings No password Operator Links to screen Actual Time Actual Date Unit Status Unit Mode Unit Capacity Evap Leaving Water Temp Evap Entering Water Temp...

Страница 56: ...W Count R Last Occurrence R Screen U 37 From Screen U 32 Circuit 1 Event Log No password Operator Links to screen Event Selection R W Day Selection R W Count R Last Occurrence R Screen U 38 From Scre...

Страница 57: ...mpressor Stop Compressor 3 4 Run Hours Number Of Starts Last Compressor Start Last Compressor Stop Compressor 5 6 Run Hours Number Of Starts Last Compressor Start Last Compressor Stop Condenser Number...

Страница 58: ...r 5 6 Output State Liquid Line Solenoid Output State Hot Gas Bypass Output State Fan Output 1 State Fan Output 2 State Fan Output 3 State Fan Output 4 State Fan Output 5 State Fan VFD Speed Screen Cx...

Страница 59: ...peed Cond Target 100 Cond Target 67 Cond Target 50 Cond Target 33 Screen Cx 7 From Screen Cx 1 EXV No password Operator Links to screen EXV State Suction Superheat Superheat Target EXV Control Mode EX...

Страница 60: ...the Motor WARNING Avoid swapping any 2 of the 3 motor lead connections which will cause reversal of the motor direction In applications where reversed rotation could cause equipment damage or personne...

Страница 61: ...button will return to the Frequency Reference display 3 Moves the cursor to the right Resets the drive to clear a fault situation 4 RUN Key Starts the drive in LOCAL mode 5 Up Arrow Key Scrolls up to...

Страница 62: ...to the MEMOBUS Modbus CommunicationInputs of the drive OP Displayed when the frequency reference is assigned to an Option Unit of the drive RP Displayed when the frequency reference is assigned to th...

Страница 63: ...an the operator is selected for Run command and frequency reference control REMOTE During run During deceleration to stop When a Run command is input and frequency reference is 0 Hz While the drive wa...

Страница 64: ...i function contact outputs do not operate The drive will not operate the motor until the error has been reset Correct the settings that caused the operation error to clear the error Tuning Errors Tuni...

Страница 65: ...ntactors and relays for excessive noise Check for over or undervoltage Inspect for signs of overheating such as melted or cracked insulation Replace damaged parts Optional BAS Interface The AGZ chille...

Страница 66: ...ntrol band before the MicroTech III controller will stage on cooling 4 Set the Evap Delta T and the Start Delta T as a starting point 5 Put both pumpdown switches PS1 and PS2 to the ON position 6 Put...

Страница 67: ...ll water strainers before placing the chiller into service Pre Startup Refrigerant Piping Checkout 1 Check all exposed brazed joints for evidence of leaks Joints may have been damaged during shipping...

Страница 68: ...air handler load Note The hot gas bypass valve cannot generate a 100 false load The pressure regulating valves are a Sporlan HGBE 8 75 150 7 8 ODF on models AGZ 025 to 065 and Sporlan HGBE 8 75 150 1...

Страница 69: ...reen Warning LED one time indicating the module has not communicated with the master controller for longer than 5 minutes Code 2 Reserved For Future Use Code 3 Short Cycling The module will flash the...

Страница 70: ...OTE If a compressor with CoreSense Communications fails in the field the CoreSense module should remain with the failed compressor so the manufacturer s technicians can download the CoreSense data to...

Страница 71: ...f cycle Power must be supplied to the heaters 8 hours before starting the compressors Evaporator Models AGZ 025D through 130D The evaporator is a compact high efficiency dual circuit brazed plate to p...

Страница 72: ...8 kPa Each evaporator is designed constructed inspected and stamped according to the requirements of the ASME Boiler and Pressure Vessel Code Double thickness insulation is available as an option Phas...

Страница 73: ...overy can be required strictly following Clean Air Act regulations governing refrigerant discharge to the atmosphere The Schrader purge valve is located on the vertical coil headers on both sides of t...

Страница 74: ...changed or verify moisture content by performing an acid test on the compressor oil Planned Maintenance Schedule OPERATION WEEKLY MONTHLY Note 1 ANNUAL Note 2 General Complete unit log and review Not...

Страница 75: ...410A with 400 psig rating Open cylinders slowly Avoid rough handling of cylinders and secure as appropriate Cap when not in use Do not overfill recovery cylinders or overcharge units Check gauge cali...

Страница 76: ...with approximately 15 of the coil tubes located in a subcooler section of the coil to achieve liquid cooling to within 5 F 3 C of the outdoor air temperature when all condenser fans are operating Onc...

Страница 77: ...lief is 600 650 psid Brazed connections only No StayBrite or solder connections solder should never be used with any refrigerant K or L type refrigeration tubing only Use nitrogen purge Higher R 410A...

Страница 78: ...in the event of a power failure do not normally require any maintenance The solenoids can however require replacement of the solenoid coil or of the entire valve assembly The solenoid coil can be chec...

Страница 79: ...recirculation 6 Clean coil 7 Correct Low Discharge Pressure 1 Refrigerant flood back 1 Correct 2 Wind blowing into coil at low ambient 2 Shield coil from direct wind Wind guards are available 3 Fault...

Страница 80: ...superheat 3 Crankcase heater burnout 3 Replace crankcase heater Motor Overload Relays or Circuit Breakers Open 1 Low voltage during high load conditions 1 Check supply voltage for excessive line drop...

Страница 81: ......

Страница 82: ......

Страница 83: ......

Страница 84: ...kin Applied equipment is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local Daikin Applied sales representative for warranty details To fi...

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