Daikin Pathfinder AWV Series Installation, Operation And Maintenance Manual
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Daikin Pathfinder AWV Series Installation, Operation And Maintenance Manual

Air-cooled screw chillers 100 to 565 tons (350 to 1985 kw) hfc-134a refrigerant 60/50 hz
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Installation, Operation,
and Maintenance Manual
Pathfinder
®
Air-cooled Screw Chillers
Model AWV
100 to 565 Tons (350 to 1985 kW)
HFC-134a Refrigerant
60/50 Hz
IOM 1242-2
Group: Chiller
Part Number: IOM1242-2
Date: August 2018

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Summary of Contents for Daikin Pathfinder AWV Series

  • Page 1 Installation, Operation, IOM 1242-2 and Maintenance Manual Group: Chiller Part Number: IOM1242-2 Date: August 2018 Pathfinder ® Air-cooled Screw Chillers Model AWV 100 to 565 Tons (350 to 1985 kW) HFC-134a Refrigerant 60/50 Hz...

  • Page 2: Table Of Contents

    Manufactured in an ISO 9001 & ISO 14001 certified facility ©2018 Daikin Applied. Illustrations and data cover the Daikin Applied product at the time of publication and we reserve the right to make changes in design and construction at any time without notice.
  • Page 3 Document Attached: Remote evaporator piping approval Notes: The most common problems delaying start-up and affecting unit reliability are: Field installed compressor motor power supply leads too small. Questions: Contact the local Daikin sales representative*. State size, number and type of conductors and conduits installed:...

  • Page 5: Introduction

    Operation of this equipment in a residential area may cause harmful interference in which case the owner will be required to correct the interference at the owner’s own expense. Daikin Applied disclaims any liability resulting from any interference or for the correction thereof. HAZARD IDENTIFICATION INFORMATION DANGER Dangers indicate a hazardous situation, which will result in death or serious injury if not avoided.
  • Page 6 ® contained, automatically controlled, liquid-chilling units All Daikin Applied screw chillers must be commissioned by featuring variable speed screw compressors. All model a Daikin Applied service technician or an authorized service AWV chillers are equipped with a single evaporator and provider.
  • Page 7 If the drawings are 2. Unit with 8 lifting points illustrated above; the actual not available, consult the local Daikin Applied sales office for unit configuration may vary from this diagram. See assistance.

  • Page 8: Clearance Requirements

    nsTallaTIon and pplICaTIon onsIderaTIons Clearance Requirements For ground level applications, the unit must be installed on a substantial base that will not settle. Use a one-piece Sufficient clearance must be maintained between the unit and concrete slab with footings extended below the frost line. adjacent walls or other units to allow the required unit air flow The foundation must be level within 13 mm (1/2 inch) over to reach the coils, see...
  • Page 9 nsTallaTIon and pplICaTIon onsIderaTIons Case 1: Building or Wall on One Side of Unit Figure 6: Case 1 for AWV012-014 Models % Full Load Capacity Reduction (AWV012-014) For all models, maintain a 4 foot minimum from a wall of any height;...
  • Page 10 nsTallaTIon and pplICaTIon onsIderaTIons Case 2: Two Units Side-by-Side Figure 8: Case 1 for AWV020-024 % Full Load Capacity Reduction (AWV020-024) For all models, there must be a minimum of 6 feet between two units placed side-by-side; however, performance may 1.4% 4 Feet be affected at this distance due to air recirculation and...
  • Page 11 nsTallaTIon and pplICaTIon onsIderaTIons Figure 12: Case 2 - Power Increase Figure 14: Case 3 - Full Load Capacity Reduction Full Load Power Increase Full Load Capacity Reduction Distance Between Units AWV008 AWV010 AWV012 AWV014 AWV016 AWV018 AWV020 AWV022 AWV024 AWV026 AWV028 AWV030...
  • Page 12 Have any pit installation reviewed by as opening control panel doors. For uneven wall spacing, the the Daikin Applied sales representative prior to installation to distance from the unit to each wall can be averaged providing ensure it has sufficient air-flow characteristics and approved by no distance is less than 4 feet.
  • Page 13 nsTallaTIon and pplICaTIon onsIderaTIons Figure 20: Case 5 for AWV012-014 Figure 22: Case 5 for AWV020-024 Full Load Capacity Reduction (AWV012-014) Full Load Capacity Reduction (AWV020-024) Depth of Pit / Wall Height (ft) Depth of Pit / Wall Height (ft) Distance = 6 ft Distance = 8 ft Distance = 10 ft...
  • Page 14 nsTallaTIon and pplICaTIon onsIderaTIons Chilled Water Piping Figure 24: Typical Chilled Water Piping, Braze Plate Vent Strainer Inlet Isolation Vibration Valves Eliminators Outlet Flow Switch Drain WELDED PIPE CONNECTIONS ARE NOT ALLOWED BETWEEN THE STRAINER AND EVAPORATOR DUE TO THE CHANCE OF SLAG ENTERING THE EVAPORATOR Figure 25: Typical Chilled Water Piping, Shell and Tube Evaporator VENT LEAVING FLUID...

  • Page 15: System Water Volume

    WARNING Daikin Applied recommends against the use of PVC and CPVC piping for chilled water systems. In the event the pipe is exposed to POE oil used in the refrigerant system, the pipe can be chemically damaged and pipe failure can occur.

  • Page 16: Flow Switch

    Refer to Daikin Applied Chiller Application Guide, AG ambient temperature or 10°F (5.6°C) below the lowest 31-003, for method of calculating “Minimum Chilled Water design leaving water temperature, whichever is lower. Volume”. The use of glycol antifreeze is generally considered the safest protection against freeze-up;...

  • Page 17: Remote Evaporators

    Field-supplied disconnect switches are required if not factory- solution temperatures per software range limits. Consult the supplied with the unit. Disconnecting means are addressed by local Daikin Applied sales office for performance outside Article 440 of the NEC , which requires “disconnecting means ®...
  • Page 18 The chiller must be stored in a dry location and protected from transformer. any damage or sources of corrosion. A Daikin Applied service representative must perform an inspection and leak test of the unit on a minimum quarterly schedule, to be paid by the Use with On-Site Generators owner or contractor.
  • Page 19 nsTallaTIon and pplICaTIon onsIderaTIons Figure 27: Field Wiring Diagram - Single Point Power PANEL POWER BLOCK CIRCUIT BREAKER (BY OTHERS) DISCONNECT SWITCH 3 PHASE COMPRESSOR(S) POWER AND FAN MOTORS SOURCE OR CIRCUIT 1 EARTH F120 F120 GROUND DISCONNECT (BY OTHERS) FUSE OPTIONAL 20A for 2KVA...
  • Page 20 nsTallaTIon and pplICaTIon onsIderaTIons Figure 28: Field Wiring Diagram - Multiple Point Power PANEL POWER BLOCK CIRCUIT BREAKER (BY OTHERS) DISCONNECT SWITCH 3 PHASE COMPRESSOR(S) POWER AND FAN MOTORS SOURCE OR CIRCUIT 1 EARTH F120 F120 GROUND Note: Separate grounding is DISCONNECT (BY OTHERS) required if fed from different...
  • Page 21 nsTallaTIon and pplICaTIon onsIderaTIons Figure 29: Representative Refrigerant Diagram - Packaged Unit With Shell & Tube Evaporator Without Optional Economizer www.DaikinApplied.com IOM 1242-2 • PATHFINDER MODEL AWV CHILLERS ®...
  • Page 22 nsTallaTIon and pplICaTIon onsIderaTIons Figure 30: Representative Refrigerant Diagram - Packaged Unit With Shell & Tube Evaporator With Optional Economizer IOM 1242-2 • PATHFINDER MODEL AWV CHILLERS www.DaikinApplied.com ®...
  • Page 23 nsTallaTIon and pplICaTIon onsIderaTIons Figure 31: Representative Refrigerant Diagram - Packaged Unit With Braze Plate Evaporator Without Optional Economizer www.DaikinApplied.com IOM 1242-2 • PATHFINDER MODEL AWV CHILLERS ®...
  • Page 24 nsTallaTIon and pplICaTIon onsIderaTIons Representative Refrigerant Diagram - Packaged Unit With Braze Plate Evaporator With Optional Economizer IOM 1242-2 • PATHFINDER MODEL AWV CHILLERS www.DaikinApplied.com ®...

  • Page 25: Performance Data

    AWV performance data is available from the current version of All field piping, wiring and procedures must comply with Daikin Sales Tools or the local sales office. There is a derate to design guidelines set forth in this manual and be performed...

  • Page 26: Dimensional Drawings

    The location and size of the refrigerant connections are shown 4. One suction line pressure transducer per circuit with 100 on dimensional drawings available from a Daikin Applied sales feet of cable coiled up and attached to the unit base for representative.
  • Page 27 nsTallaTIon and pplICaTIon onsIderaTIons emoTe vaporaTors Figure 33: Piping Schematic, Remote Evaporator (One of Two Circuits) REMOTE CHILLER NOTE: PIPING SHOWN FOR ONE SYSTEM OF UNIT. UNIT HAS TWO INDEPENDANT SYSTEMS. REMOTE CHILLER WITH OPTIONAL ECONOMIZER NOTE: PIPING SHOWN FOR ONE SYSTEM OF UNIT. UNIT HAS TWO INDEPENDANT SYSTEMS.
  • Page 28 nsTallaTIon and pplICaTIon onsIderaTIons emoTe vaporaTors Table 5: Sizing Guidelines for Horizontal or Downflow Suction Lines and Liquid Lines Recommended Horizontal or Downflow Suction Line Size Recommended Liquid Line Size Nominal Nominal Circuit Estimated Line Suction Line Circuit Estimated Line Liquid Line Size Capacity TEL (ft)
  • Page 29 nsTallaTIon and pplICaTIon onsIderaTIons emoTe vaporaTors Table 6: Sizing Guidelines for Horizontal or Downflow Suction Lines and Liquid Lines Recommended Horizontal or Downflow Suction Line Size Recommended Liquid Line Size Nominal Nominal Circuit Estimated Line Suction Line Circuit Estimated Line Liquid Line Size Capacity TEL (ft)
  • Page 30 nsTallaTIon and pplICaTIon onsIderaTIons emoTe vaporaTors Table 7: Sizing Guidelines for Horizontal or Downflow Suction Lines and Liquid Lines Recommended Horizontal or Downflow Suction Line Size Recommended Liquid Line Sizes Nominal Nominal Circuit Estimated Line Suction Line Circuit Estimated Line Liquid Line Size Capacity TEL (ft)
  • Page 31 nsTallaTIon and pplICaTIon onsIderaTIons emoTe vaporaTors Table 8: Alternate Sizing Guidelines for Horizontal or Table 9: Sizing Guidelines for Upflow Lines Downflow Suction Lines - Steel Recommended Upflow Suction Line Size Recommended Horizontal or Downflow Suction Line Size Nominal Circuit Suction Line Estimated Line Nominal Circuit...
  • Page 32 ImensIons emoTe vaporaTors ImensIons emoTe vaporaTors Table 10: Evaporator Data for AWV Remote Evaporator Models Shipping Weight Operating Weight Water Volume Evap Model (lb) (kg) (lb) (kg) (gal) EV40271010/9 1197 1761 EV40271111/7 1219 1773 EV40271212/7 1239 1770 EV50271414/7 1739 2631 1193 EV50271717/5 1819...
  • Page 33 ImensIons emoTe vaporaTors Figure 35: Evaporator Model EV5027 2935 115.6 2750 108.3 1375 54.1 HEATER WIRES BLOCK-OFF WITH PLATES, SPACERS, AND BOLTS EVAPORATOR EV5027 (M14 X 1.50 X 50MM LONG) 332532200 22.5 5.43 2360 5.43 92.9 ALL Ø.25 COUPLINGS DETAIL A 13.9 8.63 PIPE EVAPORATOR...
  • Page 34 ImensIons emoTe vaporaTors Figure 37: Evaporator Model EV6633 3527 138.9 REF 3300 129.9 HEATER WIRE APPROX. LOCATION BLOCK-OFF WITH PLATES, SPACERS, AND BOLTS (M14 X 1.50 X 50MM LONG EVAPORATOR EV6633 1650 65.0 332945000 26.1 2830 [235] LIQUID AND SUCTION CAST HEAD 9.25 111.4 DETAILS ARE FOR REFERENCE ONLY...
  • Page 35 ImensIonal rawIngs ImensIonal rawIngs Figure 39: Reference Dimensional Drawing - 08 Fan to 14 Fan Configurations With Braze Plate Evaporator 43.8 WATER INLET / OUTLET MINI CONTROL BOX (ALL TURBOSCREW UNITS) L1 / L2 L3 / L4 87.6 DOES NOT INCLUDE L5 / L6 (10, 12 &...

  • Page 36: Pressure Drop Data

    ImensIonal rawIngs Figure 40: Reference Dimensional Drawing - 12 Fan and 14 Fan Configurations with Shell and Tube Evaporator 87.6 DOES NOT INCLUDE LIFTING LUGS 100.1 WATER INLET CG Y WATER OUTLET CG X CG Z 5.2 BASE FIELD POWER ENTRY FROM RAIL WIDTH BOTTOM FOR SMALL CONTROL BOX (SHOWN),...
  • Page 37 ImensIonal rawIngs Table 12: Unit Dimensions by Configuration with Shell and Tube Evaporator L1 / L3 / L5 / L7 / M1 / M3 / M5 / M7 / M9 / # OF EVAP D LH D RH CG X CG Y CG Z FANS EV 4027 148.4...
  • Page 38 Dimensional Drawings section beginning on page 35 or in the Submittal As-Built Drawings, available from a Daikin Applied sales representative. Submittal As- Built Drawings also specify the correct isolator color for each mounting location, if ordered. When spring isolators are required, install springs under the main unit supports.
  • Page 39 ressure ressure Table 13: Evaporator Flow Limits Figure 48: Model ACH1000DQ-250AH Conn . Minimum Maximum Evaporator ACH1000DQ-250AH EVAP Size (in .) ft H ft H ACH1000DQ-166AH 157.0 528.0 17.1 ACH1000DQ-206AH 197.0 660.0 16.9 ACH1000DQ-250AH 239.0 766.0 16.8 ACH1000DQ-330AH 315.0 925.0 16.9 EV40271010/09 148.8...
  • Page 40 ressure Figure 51: Model EV40271111/07 Figure 54: Model EV50271717/05 Evaporator EV50271717/05 Evaporator EV40271111/07 (ft) (ft) 1000 1200 1400 Flow Rate (gpm) Flow Rate (gpm) Figure 52: Model EV40271212/07 Figure 55: Model EV50391212/11 Evaporator EV50391212/11 Evaporator EV40271212/07 (ft) (ft) Flow Rate (gpm) Flow Rate (gpm) Figure 53: Model EV50271414/07 Figure 56: Model EV66331515/07...
  • Page 41 ressure Figure 57: Model EV66391414/11 Evaporator EV66391414/11 (ft) 1000 1200 Flow Rate (gpm) Figure 58: Model EV66391616/09 Evaporator EV66391616/09 (ft) 1000 1200 1400 Flow Rate (gpm) Figure 59: Model EV66391717/07 Evaporator EV663917170/7 (ft) 1000 1200 1400 1600 1800 Flow Rate (gpm) www.DaikinApplied.com IOM 1242-2 •...

  • Page 42: Software Version

    During a number of extension input/output (I/O) modules, which vary the initial startup of the chiller, the Daikin Applied service depending on the unit size and configuration. The control technician will be available to answer any questions and system provides the monitoring and functions required for the instruct the proper operating procedures.
  • Page 43 onTroller peraTIon System Architecture Modbus Communication - Unit The overall controls architecture uses the following: The unit controller (UC) communicates to the compressor VFD’s and the EXV modules via the Modbus RTU connection • One MicroTech ® III unit controller on the controller itself.
  • Page 44 onTroller peraTIon MicroTech III Inputs/Outputs CC Modules - Circuit #1 and #2 ® Unit Controller - UC Module Table 18: Analog Inputs - For Each Circuit Description Signal Source Table 14: Analog Inputs - Evaporator Discharge Temperature NTC Thermister (10K@25°C) Description Signal Source Suction Temperature...
  • Page 45 onTroller peraTIon Economizer EXV Module Compressor VFDs Table 24: Analog Inputs Table 30: Digital Inputs Description Signal Off Signal On Description Signal Source Circuit # Alarm No Alarm Economizer Pressure Circuit #1 Ratiometric 0.5-4.5 Vdc Mechanical High Pressure Switch Economizer Temperature Circuit #1 NTC 10K Thermister Economizer Pressure Circuit #2 Ratiometric 0.5-4.5 Vdc...
  • Page 46 onTroller peraTIon Set Points The following parameters are remembered during power off (permanent memory), are factory set to the Default value, and can be adjusted to any value in the Range column. Read and write access to these set points is determined by the Global HMI (Human Machine Interface) Standard Specification.
  • Page 47 onTroller peraTIon Table 32: Set Point Default and Range (continued) Description Default Range Evaporator Pump Control Evap Pump Control Configuration #1 Only #1 Only, #2 Only, Auto, #1 Primary, #2 Primary Evap Recirc Timer 90 seconds 0 to 300 seconds Evap Pump 1 Run Hours 0 to 999999 hours Evap Pump 2 Run Hours...
  • Page 48 onTroller peraTIon Table 33: Unit Test Mode Set Points Description Default Range Test Unit Alarm Output Off, On Test Evaporator Pump Output 1 Off, On Test Evaporator Pump Output 2 Off, On NOTE: Unit test mode set points can be changed only when the unit mode is Test. When the unit mode is no longer Test, all unit test mode set points will be changed back to the ‘off’...
  • Page 49 onTroller peraTIon Circuit Level Set Points The settings in this section all exist for each individual circuit. Table 39: Set Points for Individual Circuits Description Default Range Mode, Enabling, Configuration Circuit Mode Enable Disable, Enable, Test Capacity Control Auto Auto, Manual Manual Speed See Note 1 Condenser Control...
  • Page 50 onTroller peraTIon Circuit Test Mode Set Points Circuit test mode set points can be changed when either the unit mode is Test, or the circuit mode is Test. When neither the unit nor the circuit are in Test mode, all the circuit test mode set points for the circuit are automatically changed back to their ‘off’ values. Description Default Range...

  • Page 51: Unit Mode Selection

    unCTIons unCTIons Unit Mode Selection Calculations The operating mode of the unit is determined by set points and Evaporator inputs to the chiller. The Available Modes set point determines what modes of operation can be used. This set point also Error determines whether the unit is configured for glycol use.
  • Page 52 unCTIons Unit Control States T1 - Off to Auto. All of the following are required: • Unit is enabled The unit will always be in one of three states: • No unit alarm requiring shutdown is active 1. Off – Unit is not enabled to run. •...

  • Page 53: Evaporator Pump Control

    unCTIons Ice Mode Start Delay BAS Annunciation Low Ambient Lockout is not an alarm, but it can be An adjustable start-to-start Ice Cycle Delay timer will limit the annunciated to the BAS as if it is one. When the Low OAT frequency with which the chiller may start in Ice Mode.

  • Page 54: Freeze Protection

    unCTIons Freeze Protection Table 45: LWT Targets Control Source Available Control To protect the evaporator from freezing, the evaporator pump Mode Modes Set Source Set Base LWT Target will start if the manual reset flow loss alarm is not active and Input Request Point...

  • Page 55: Unit Capacity Control

    unCTIons Unit Capacity Control starts • if starts are equal, it must have the least run hours Unit capacity control will be performed as described in this • if run hours are equal, it must be the lowest numbered section. A combination of starting/stopping compressors and circuit loading/unloading compressors is used to control the overall The next compressor to unload must meet the following...

  • Page 56: Demand Limit

    unCTIons Ice Mode Operation Staging Circuits Off Unit capacity control will command a single circuit to shut down In Ice Mode, running circuits will load up simultaneously at the if both circuits are running and any of the following are true: maximum possible rate that allows for stable operation of the individual circuits.
  • Page 57 unCTIons RapidRestore ® The option allows the capability to restart more quickly and to load faster than normal when power is lost and restored. Enabling Changing the RapidRestore set point to Enable will require ® the following to be true: •...

  • Page 58: Circuit Functions

    IrCuIT unCTIons IrCuIT unCTIons Circuit Functions described as follows. Components controlled at the circuit level include: Table 46: Saturated Condenser Temperature Conditions • Compressor VFD Saturated Evap Max Cond Saturated • Compressor VR Solenoid Valves Condition Temp or LWT Temp (°C) •...
  • Page 59 IrCuIT unCTIons Circuit Availability T1 – Off to Preopen - All of the following are required: • Circuit is available to start per the previous section A circuit is available to start if the following conditions are true: • Adequate pressure in the evaporator and condenser (see •...

  • Page 60: Capacity Control

    IrCuIT unCTIons Circuit Status Compressor Control The compressor is controlled via: Circuit Status is displayed to indicate the general condition of the circuit. The following table lists the text displayed for each • a digital output to give the run command to compressor circuit status and the conditions that enable each status.

  • Page 61: Condenser Fan Control

    IrCuIT unCTIons When a capacity increase occurs, a time delay starts; and Table 49: VR Solenoid Valve Control Stages when a capacity decrease occurs, a separate time delay starts. While either of these delays is active, no normal capacity Stage Up Stage Down Stage changes will occur.
  • Page 62 IrCuIT unCTIons Condenser Fan Control State Minimum Target Value Minimum Target value is designed to keep the compressor in There are only two control states: Off and Condensing its operational envelope. This value is calculated based on Temperature Control. the pressure difference, pressure ratio and fan stage down When the circuit state is Off or Preopen, condenser fan control deadband.
  • Page 63 IrCuIT unCTIons Fan Outputs Per Fan Stage The table below shows which digital outputs are energized for each stage. Table 52: Digital Outputs Energized for Each Stage # Fans On Circuit 1,2,3 1,3,5 1,2,3,4 1,2,3,5 1,3,5 1,2,3 1,2,3 1,2,3 1,3,4,5 1,2,3,5 1,3,5 1,2,5...
  • Page 64 IrCuIT unCTIons Stage Up Compensation The first fan will turn on when condenser saturated temperature is above the target rather than using the error In order to create a smoother transition when the fan stage accumulator. increases, the VFD compensates by slowing down initially. This is accomplished by adding the new fan stage up deadband Staging Down to the VFD target.
  • Page 65 IrCuIT unCTIons Speed Command To Motors • MOP Control – EXV is controlling to maximum operating pressure for compressor All fan motors will be sent a speed command via modbus. The speed command is in units of rpm with 800 rpm corresponding Closed State to 100% and will vary based on the percent speed calculation.
  • Page 66 IrCuIT unCTIons MOP Control State Control Concept In MOP (Maximum Operating Pressure) Control, the EXV is • EXV will be positioned using control algorithm positioned to control the evaporator pressure to a target. • Maintain DSH above requirements for compressor •...

  • Page 67: Liquid Line Solenoid Valve

    IrCuIT unCTIons Liquid Line Solenoid Valve As an option, the chiller can be equipped with liquid line solenoid valves. When configured with this option, the Liquid Line Solenoid Valve Configuration setting should be set to Yes. If the chiller is configured with liquid line solenoid valves, the liquid line solenoid valve output should be activated when the circuit enters the Preopen state and remain on during the Start and Run states.
  • Page 68 larms and venTs larms and venTs Situations may arise that require some action from the chiller, If the problem(s) causing the alarm have been corrected, the or that should be logged for future reference. The alarm digital alarms will be cleared, disappear from the Active Alarm list output will be operated based on active alarm scenarios as and be posted in the Alarm Log.
  • Page 69 larms and venTs Evaporator Flow Loss Evaporator Water Freeze Protect Alarm: Evaporator Flow Loss Alarm: Evaporator Water Freeze Protect Displayed Text: Evap Water Flow Loss Displayed Text: Evap Water Freeze Trigger: 1: Evap Pump State = Run AND Evap Flow Trigger: Evaporator LWT or EWT equal to or Digital Input = No Flow for time >...

  • Page 70: Emergency Stop

    larms and venTs Evaporator EWT Sensor Fault Emergency Stop Alarm: Emergency Stop Alarm: Evaporator EWT Sensor Fault Displayed Text: Emergency Stop Switch Displayed Text: Evap EWT SenFault Trigger: Emergency Stop input off for 1 second Trigger: If any of the following occur for more than one second: Action Taken: Rapid shutdown all circuits and lock out...
  • Page 71 larms and venTs Evaporator Pump #1 Failure Economizer EXV Module Comm Failure Alarm: Evaporator Pump #1 Failure Alarm: Economizer EXV Module Comm Failure Displayed Text: Evap Pump 1 Fault Text: EconExvModCommFail Trigger: Unit is configured with primary and Trigger: Economizer Configuration set point is set to Yes backup pumps, pump #1 is running, and communication with the economizer EXV and the pump control logic switches to...
  • Page 72 larms and venTs Figure 68: Low Evaporator Pressure Fault Diagram CIRCUIT START OAT ≥ -8°C OAT< -8°C First 2 occurrences for this Evap Pressure < 0 kPa for 5 Evap Pressure < 0 kPa for condition will shut down seconds 20 seconds circuit but do not trigger the alarm.
  • Page 73 larms and venTs High Discharge Temperature High Motor Temperature Alarm: High Discharge Temperature Alarm: High Motor Temperature Displayed Text: Cn DiscTempHigh Displayed Text: Cn Motor Temp High Trigger: The following are true for 5 seconds: Trigger: Compressor VFD reports motor •...
  • Page 74 larms and venTs Low Discharge Superheat Compressor VFD Temperature High Alarm: Low Discharge Superheat Alarm: Compressor VFD Temperature High Displayed Text: Cn Disc SH Low Displayed Text: Cn CompVfdTempHigh Trigger: If all of the following are true for Trigger: VFD Heatsink temperature > Max VFD at least 30 minutes, the alarm is Temperature for 5 seconds triggered:...
  • Page 75 larms and venTs CC Module Comm Failure Condenser Pressure Sensor Fault Alarm: CC Module Comm Failure Alarm: Condenser Pressure Sensor Fault Displayed Text: CCn Module Comm Fail Displayed Text: Cn CondPressSenFault Trigger: Communication with the module has failed. Trigger: Trigger any time sensor input voltage is Specifically, this means the reliability value less than 400 mv or more than 4600 mv reported for the module is anything other...
  • Page 76 larms and venTs Discharge Temperature Sensor Fault Economizer Pressure Sensor Fault Alarm: Discharge Temperature Sensor Fault Alarm: Economizer Pressure Sensor Fault Displayed Text: Cn DiscTempSenFault Displayed Text: Cn EconPressSenFault Trigger: Trigger if any of the following are true for at Trigger: The following conditions must be true to least 1 second:...
  • Page 77 larms and venTs DC Fan Motor Fault Low Evaporator Pressure - Unload Alarm: DC Fan Motor Fault Trigger: This event will trigger when the unit mode is Displayed Text: Cn DcFanMotorFault Cool, the circuit state is Run, and evaporator Trigger: Any DC fan motor on the circuit has a pressure drops below the Low Evaporator fault as indicated by a flag sent from the...
  • Page 78 larms and venTs Low Pressure Difference Or Ratio Shutdown High Motor Current - Unload Trigger: This event will trigger on the first and second Trigger: This event will trigger when all of the following occurrence of the below conditions within are true for at least 3 seconds.
  • Page 79 larms and venTs High VFD Temperature Hold Trigger: This event will trigger when all of the following are true for at least for 30 seconds. • Unit mode is Cool • Compressor is running • VFD Heatsink Temp > Max VFD Temperature - 6°C Action Taken: Compressor will not be able to increase speed/capacity.
  • Page 80 • Technician/Manager level - will be provided at startup • Menu title, displayed in the first line as in Figure • Daikin Applied service technician level • Link (also called Jump) having an arrow ( > ) in the right Enter passwords from the Main Menu: of the line and used to link to the next menu.
  • Page 81 sIng The onTroller Once a valid password has been entered, the controller allows further changes and access without requiring the user to enter a password until either the password timer expires or a different password is entered. The default value for this password timer is 10 minutes.
  • Page 82 sIng The onTroller Figure 73: HMI Keypad Navigation IOM 1242-2 • PATHFINDER MODEL AWV CHILLERS www.DaikinApplied.com ®...
  • Page 83 Complete the pre-start checklist at the front of will pump down once and not run again until the Q1 and Q2 this manual and return to Daikin Applied prior to startup date. switches are moved to the “Auto” position. If Q1 and Q2 are NOTICE in the “Auto”...
  • Page 84 TarTup and huTdown 8. If glycol is not used in the system, drain all water from “Auto” position. the unit evaporator and chilled water piping if the unit is The following table gives glycol concentrations required for to be shutdown during winter and temperatures below freeze protection.
  • Page 85 ysTem aInTenanCe ysTem aInTenanCe General Oil Filter Removal and Renewal On initial startup and periodically during operation, it will Prior to this procedure, pump out the compressor. Isolate the be necessary to perform certain routine service checks. electrical supply to the control panels and compressor motor Among these are checking the liquid line sight glasses, and terminal.
  • Page 86 In the unlikely occurence of a coil leak, contact Daikin Applied to receive a replacement coil module. Figure 77: Microchannel Coil Cross Section 4.
  • Page 87 Sufficient product must be fins. Daikin recommends the use of non-caustic, non-acidic applied uniformly across the substrate to thoroughly cleaners available at most air conditioning supply outlets. Flush wet out surface with no areas missed.
  • Page 88 NOT to stop the pump(s) as immediate freeze-up can occur. Lead-Lag This method of freeze protection is only effective as A feature on all Daikin Pathfinder air-cooled chillers is a long as the facility and the chiller have power. The only ®...
  • Page 89 ysTem aInTenanCe Figure 78: Preventative Maintenance Schedule Monthly Annual Operation Weekly (Note 1) (Note 2) General Complete unit log and review (Note 3) Inspect unit for loose or damaged components and visible leaks Inspect thermal insulation for integrity Clean and paint as required Electrical ( * including the VFDs) Sequence test controls * Check contactors for pitting, replace as required *...

  • Page 90: Appendix

    ppendIx ppendIx Definitions Active Set Point The active set point is the setting in effect at any given Outside ambient air temperature moment. This variation occurs on set points that can be altered Offset during normal operation. Resetting the chilled water leaving Offset is the difference between the actual value of a variable temperature set point by one of several methods, such as (such as temperature or pressure) and the reading shown on...
  • Page 91 (collectively “Owner”) that Company, at it’s option, will repair or replace defective parts in the event any product manufactured by Company, including products sold under the brand name Daikin and used in the United States or Canada, proves defective in material or workmanship within twelve (12) months from initial startup or eighteen (18) months from the date shipped by Company, whichever occurs first.
  • Page 92 Now that you have made an investment in modern, efficient Daikin Applied equipment, its care should be a high priority. For training information on all Daikin Applied HVAC products, please visit us at www.DaikinApplied.com and click on Training, or call 540-248-9646 and ask for the Training Department.

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