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IOM 1274-3 • CENTRIFUGAL WATER CHILLERS 12 www.DaikinApplied.com

Installation

provides several options to assist the chiller plant designer in

providing the optimum control of condenser water temperature.

Cooling Tower Control

Control of the cooling tower is required to maintain stability and

avoid operational issues. This can be achieved through a BAS

or by using the MicroTech

II controller. For systems utilizing a

common condenser water loop for multiple purposes, the BAS

contractor must provide the control but use of the MicroTech®

output signal is still recommended.
The preferred cooling tower control utilizes a variable speed

fan. MicroTech

II will provide a control signal to determine the

proper fan speed. It can also control up to three stages of fan

cycling. Note that fan cycling can cause cooling tower water

temperature to fluctuate as fans stage on/off, potentially adding

instability to the system.
Special consideration must be given to starting the chiller when

cold condenser water is present, such as with inverted starts

or changeover from free (tower) cooling to mechanical cooling.

Daikin Applied chillers will start with entering condenser water

temperature as low as 55°F (42.8° C) providing the chilled

water temperature is below the condenser water temperature.

The minimum entering condenser water temperature while

operating is a function of the leaving chilled water temperature

and load. It is required that some method be used to control

the condenser water to maintain proper head pressure as

indicated by the MicroTech

II controller. Refer to

“Tower

Control Settings” on page 51

for details in the HMI.

Each of the following acceptable methods can be controlled by

the MicroTech® II or through a BAS utilizing the MicroTech®

output signals:

1. Three-Way Bypass Valve Operation

A traditional method for building condenser pressure at

startup with colder condenser water is with the use of

a three-way bypass valve. The device blends warmer

water leaving the condenser with cooler water from the

cooling tower at the condenser inlet. The bypass valve

position will change until full flow from the tower to the

condenser is obtained. The MicroTech

II provides only

the valve position control signal. Main power to drive

the valve actuator must be provided by the installer. The

three-way valve should be located close to the chiller

within the equipment room to minimize the water volume.

2. Two-Way Valve Operation

Another condenser control method is to use a modulating

two-way control valve located on the outlet connection of

the condenser. The valve will be nearly closed at startup

to restrict water flow, which keeps generated heat in

the condenser until an acceptable minimum condenser

pressure is reached. As heat builds, the valve will open

slowly until a full flow condition from the cooling tower

is established. A separate power source is required to

provide power to the valve actuator.

NOTE:

To ensure proper operation, caution should be

used when utilizing the two-way valve option.

3. VFD Operating with a Condenser Water Pump

A third method of condenser control for startup is

utilizing a variable frequency drive with the condenser

water pump. The speed will change as directed by the

MicroTech

II output signal until design flow is reached.

Speed adjustments may be required during the initial

chiller startup as determined by the service technician.

NOTE:

Not using the MicroTech

II logic to control valves

and variable frequency drives may result in system

instability, capacity reduction, and issues starting the

chiller with cold condenser water temperature.

Condenser Pump Sequencing

It is recommended to utilize the logic built into the MicroTech

II controller to start the condenser pump. MicroTech

II has the

capability to operate a primary pump and a secondary standby

pump. The condenser water flow should be stopped when

the chiller shuts off. This will conserve energy and prevent

refrigerant from migrating to the condenser. Moisture in the

air can condenser on the cooler surfaces of the un-insulated

condenser barrel if flow is present when the chiller is idle.

Water Side Economizer Cycle Operation

Water side economizers are commonly used for ASHRAE 90.1

compliance and energy savings. This system utilizes a heat

exchanger external to the chiller when cold cooling tower water

is available to provide cooling. The most common system uses

a heat exchanger in conjunction with the chiller’s evaporator.
The BAS contractor will need to provide controls for the heat

exchanger including isolation valves and temperature control.

The BAS contractor will also need to control the isolation

valves for the chiller. It is important to use slow-acting type

valves to prevent rapid changes in system flows. Changeover

from economizer cooling to mechanical cooling requires one

of the methods previously mentioned to maintain suitable

condenser head pressure. Contact your local Daikin Applied

representative for more information on this application.

Heat Recovery Chillers

HSC heat recovery chillers control based upon the chilled

water leaving temperature. The cooling load determines

compressor loading and unloading, the same as in a

conventional chiller. A heat recovery control algorithm is

identical to a conventional cooling-only chiller. The amount

of heat recovered from the condenser shall depend on the

cooling load. If cooling load on the chiller drops, the hot water

temperature supplied by the heat recovery condenser would

also drop.
Alternately, the 3-way cooling tower bypass valve, controlled

by heating water inlet temperature to the recovery bundle of

the condenser, can be used to manipulate the cooling tower

water loop. Based on the signal the 3-way valve gets from

the hot inlet water temperature sensor, it will bypass sufficient

water around the tower to increase the condenser water loop

temperature at the inlet. The supply water temperature to the

heating load will “float” depending on actual chiller load. This

3-way valve along with the necessary controls and wiring are

Содержание WSC

Страница 1: ...Operation and Maintenance Manual Centrifugal Chillers Model WSC HSC TSC B Vintage 300 to 1350 Tons 1050 to 4748 kW R 134a or R 513A Refrigerant 60 50 Hz IOM 1274 3 Group Chiller Part Number IOM1274 3 Date July 2023 ...

Страница 2: ...ion Modbus from Schneider Electric and Windows from Microsoft Corporation Table of Contents Introduction 5 Hazard Identification Information 5 General Description 6 Installation 7 Receiving and Handling 7 Location 8 Operating Limits 9 Field Insulation 9 Water Piping 9 Heat Recovery Condenser Connections 10 Templifier Source Water Piping 10 Water Quality Guidelines 10 Variable Fluid Flow Rates 11 C...

Страница 3: ...ical Code and local codes See Note 4 Condenser pump starting relay CP1 2 installed and wired See Note 3 Miscellaneous Yes No N A Initials Oil cooled water piping complete Units with water cooled oil coolers only Relief valve piping complete per local codes Thermometers wells gauges control etc installed Minimum system load of 80 capacity available for testing adjusting controls SiteLineTM cloud co...

Страница 4: ......

Страница 5: ... known as POE oil is a synthetic oil used in many refrigeration systems and may be present in this Daikin Applied product POE oil if ever in contact with PVC CPVC will coat the inside wall of PVC CPVC pipe causing environmental stress fractures Although there is no PVC CPVC piping in this product please keep this in mind when selecting piping materials for your application as system failure and pr...

Страница 6: ...cessary equipment protection and operating controls are factory installed in the control panel All Daikin Applied centrifugal chillers are factory tested prior to shipment and must be initially started at the job site by a factory trained Daikin Applied service technician Failure to follow this startup procedure can affect the equipment warranty The standard limited warranty on this equipment cove...

Страница 7: ...ent damage to the control panels and refrigerant piping See the certified dimension drawings included in the job submittal for the weights and center of gravity of the unit If the drawings are not available consult the local Daikin Applied sales office for assistance Spreader bars must be used between the rigging lines to keep lifting straps vertical and prevent damage to the control panels electr...

Страница 8: ...he top of the chiller The U S National Electric Code NEC or local codes can require more clearance in and around electrical components and must be checked for compliance Mounting The unit must be mounted on a level concrete or steel base Make sure that the floor or structural support is adequate to support the full operating weight of the complete unit It is not necessary to bolt the unit to the m...

Страница 9: ...ting conditions as some limits depend on unit configuration including heating and heat recovery mode limits 2 Antifreeze temperature limits must have appropriate glycol concentration 3 Depends on specific selection rating conditions Field Insulation If the optional factory installation of thermal evaporation insulation is not ordered insulation should be field installed to reduce heat loss and pre...

Страница 10: ...supported to eliminate weight and strain on the fittings and connections Chilled water piping must be adequately insulated It is recommended that field installed water piping include thermometers at the inlet and outlet connections of both vessels CAUTION When common piping is used for both building heating and cooling modes care must be taken to provide that water flowing through the evaporator c...

Страница 11: ...tor or condenser water flow rate the flow rate should not exceed the minimum or maximum limits During startup the rate of change for the evaporator flow rate should not exceed 50 of the current value per minute For normal unit operation the evaporator flow rate change should use 10 of the current value per minute as guidance System Water Volume All chilled water systems need adequate time to recog...

Страница 12: ...tor NOTE To ensure proper operation caution should be used when utilizing the two way valve option 3 VFD Operating with a Condenser Water Pump A third method of condenser control for startup is utilizing a variable frequency drive with the condenser water pump The speed will change as directed by the MicroTech II output signal until design flow is reached Speed adjustments may be required during t...

Страница 13: ...odes require that relief valves be vented to the outside of a building Relief piping connections to the relief valves must have flexible connectors CAUTION Units are shipped with refrigerant valves closed to isolate the refrigerant in the unit condenser Valves must remain closed until startup by the factory service technician Remove plastic shipping plugs if installed from the inside of the valves...

Страница 14: ...ficient oil cooler flow will result If the pressure drop across the evaporator is less than the oil cooler the oil cooler must be piped across the chilled water pump provided that its pressure drop is sufficient The water flow through the oil cooler will be adjusted by the unit s regulating valve so that the temperature of oil supplied to the compressor bearings leaving the oil cooler is between 9...

Страница 15: ... 079 126 NOTE Dotted lines indicate field supplied piping and components Figure 10 Oil Cooler Piping With City Water Models WSC HSC TSC 079 126 Oil Heater The oil sump is equipped with an immersion heater that is installed in a tube so that it can be removed without disturbing the oil Figure 11 Oil Cooler Oil Sump Water Connections Models 079 126 ...

Страница 16: ... DESCRIPTION P104 EVAPORATOR ENTERING WATER TEMPERATURE P104 CONDENSER ENTERING WATER TEMPERATURE P104 CONDENSER LEAVING WATER TEMPERATURE P104 LIQUID LINE TEMPERATURE CHECK VALVE CONDENSER EVAPORATOR SHUTOFF VALVE ELECTRONIC EXPANSION VALVE TEMPERATURE SENSOR SIGHT GLASS LIQUID LINE RELIEF VALVE LIQUID INJECTION LINE MOTOR COOLING LINE SERVICE VALVE THREE WAYVALVE BALL VALVE STRAINER SOLENOID VAL...

Страница 17: ...rts in the wrong direction and would not be covered by product warranty The compressor is covered under UL 984 by which its terminal box is determined per clause 8 1 by the end use product standard which is UL 1995 If exceeding 1000V with controls Daikin Applied refers contractor to employ UL508A The NFPA 70 NEC provides information pertaining to minimum wire bending space Wiring to a terminal box...

Страница 18: ...controllers strictly conform to the interoperability guidelines of the LonMark Interoperability Association and BACnet International They have received LonMark certification with optional LonWorks communication module Protocol Options The following protocol options are available BACnet MS TP BACnet IP BACnet Ethernet LonWorks Modbus RTU The BAS communication module can be ordered with the chiller ...

Страница 19: ...emove wire jumper 6 Evaporator and condenser flow switches are required Thermal dispersion flow switches are installed and wired from the factory as standard 7 Customer supplied 24 to 230 Vac 20 amp power for optional evaporator and condenser water pump control power and tower fans is supplied to unit control terminals UTBI 85 power 86 neutral PE equipment ground 8 Optional customer supplied 24 to...

Страница 20: ...IOM 1274 3 CENTRIFUGAL WATER CHILLERS 20 www DaikinApplied com Installation Figure 16 Centrifugal Field Wiring Schematic ...

Страница 21: ...Installation www DaikinApplied com 21 IOM 1274 3 CENTRIFUGAL WATER CHILLERS Figure 17 Compressor Control Box ...

Страница 22: ...IOM 1274 3 CENTRIFUGAL WATER CHILLERS 22 www DaikinApplied com Installation Figure 18 Unit Control Box ...

Страница 23: ...from the factory and close all refrigerant valves Keep oil sump valves closed to avoid refrigerant migration to the oil sump Over a long term the refrigerant will migrate to the oil tank and displace the oil The oil will spill over in to the evaporator through the vent line and when the unit is powered up and the heaters turned on the refrigerant will boil out and the sump will be empty 5 Clean an...

Страница 24: ...e unit if the vessels are to be separated Exert the proper precautions before attempting any disassembly assume the condenser isolation valves may have leaked and that any component of the chiller may be pressurized with refrigerant Suction and discharge lines have bolt on flanges Motor cooling line is brazed at mechanical connections Blockoff plates are required to cover any refrigerant connectio...

Страница 25: ...g them Refrigerant will not be shipped with the chiller and must be procured by others Compressor s and vessels receive an inert gas holding charge that must be released prior to attempting to open any connection All free piping ends are capped blockoffs will cover all compressor and vessel openings Unit ships with vessel and or head insulation if ordered Unit ships with replacement refrigerant ga...

Страница 26: ... SEPARATED LEFT VIEW GG NOTES IF NO DIMENSION IS LISTED IN THE MOUNTED STARTER TABLE IT IS BECAUSE THE STARTER BRACKETS DO NOT EXCEED 1 THE ENVELOPE DIMENSIONED IN THE ALL UNITS TABLE DIMENSIONS FF JJ NN AND PP DO NOT TAKE INTO ACCOUNT ANY VALVES SUCH AS RELIEF VALVES THAT MAY INCREASE 2 THE ENVELOPE EXPLANATION OF KNOCKDOWN DIMENSIONS DD HEIGHT BOTTOM OF FOOT TO TOP OF COND TIE PLATE EE OVERALL W...

Страница 27: ...60 95 2413 95 2413 FF 65 7 2108 71 0 2260 71 0 2260 73 1 2413 73 1 2413 GG 50 2 1275 50 2 1275 50 2 1275 56 9 1446 56 9 1446 HH 45 3 1152 45 3 1152 45 3 1152 49 5 1259 49 5 1259 JJ 44 8 1138 52 4 1331 52 4 1331 52 4 1331 52 4 1331 KK 48 4 1230 54 4 1382 54 4 1382 54 4 1382 54 4 1382 LL 24 6 625 21 7 553 21 7 553 23 9 607 23 9 607 MM 86 6 2201 91 9 2334 91 9 2334 97 9 2486 97 9 2486 NN 65 7 1670 71...

Страница 28: ...d the body of the waterbox Rolling dollies may also be used Lift the compressor by wrapping lifting straps around the body of the assembly see Figure 24 Rolling dollies supporting the full length of the compressor may also be used Note component weights and dimensions are listed in Table 8 to Table 10 Figure 22 Vessel Stack Lifting Rigging Setup NOTE The spreader bars in Figure 22 and Figure 23 ar...

Страница 29: ...e compressor gear housing and condenser connection points see Figure 26 6 Remove motor cooling line Provide blockoff caps at the compressor and condenser connection points Cover filter drier opening to prevent debris from entering 7 Remove the motor drain lines providing block off caps at the compressor motor housing and evaporator connections The 1 4 vent line will need to be braced in a minimum ...

Страница 30: ...e the mounting bolts loose until the suction and discharge lines are in place and aligned Before tightening the couplings position the suction and discharge piping so that the compressor can be aligned properly When piping is in the correct position secure the compressor mounting bolts and proceed with installing the couplings using a thin coating of lubricant 3 Install the liquid line 4 Install t...

Страница 31: ...nstallation www DaikinApplied com 31 IOM 1274 3 CENTRIFUGAL WATER CHILLERS Figure 28 Liquid Line Assembly Representative Placement Shown Figure 29 Oil Sump Oil Cooler Assembly Models WSC TSC HSC 079 126 ...

Страница 32: ...D FROM TERMINAL BLOCK LOCATED IN THE COMPRESSOR TERMINAL BOX IF STARTER IS FREESTANDING OR FIELD MOUNTED CLFS FLOW SWITCHES ELFS COMPRESSOR CONTROL BOX CS4 OIL SUMP TEMP CS5 CMPR SUCTION TEMP CS7 CMPR DISCHARGE TEMP CS10 EVAP LEAVING WATER TEMP CS9 OIL FEED TEMP CS6 COND PRESSURE SENSOR CS3 EVAP PRESSURE SENSOR CS2 OIL FEED PRESSURE SENSOR CS1 OIL SUMP PRESSURE SENSOR HIGH PRESSURE SWITCH CABLES A...

Страница 33: ...Installation www DaikinApplied com 33 IOM 1274 3 CENTRIFUGAL WATER CHILLERS Figure 32 Unit Electrical and Sensor Locations Figure 33 Unit Electrical and Sensor Locations ...

Страница 34: ...IOM 1274 3 CENTRIFUGAL WATER CHILLERS 34 www DaikinApplied com Installation Figure 34 Unit Electrical and Sensor Locations ...

Страница 35: ...last chiller to insure reading a thoroughly mixed water temperature Passing through one or two elbows will usually suffice Series chillers are normally single pass resulting in undesirable temperature stratification at the outlet nozzle Connectability Centrifugal models WSC and WDC of various vintages with MicroTech controllers can be interconnected but all must be loaded with the most recent cont...

Страница 36: ...ttempting operation During the initial startup of the chiller the Daikin Applied technician will be available to answer any questions and instruct the proper operating procedures It is recommended that the operator maintain an operating log for each individual chiller unit In addition a separate maintenance log should be kept of the periodic maintenance and servicing activities Operator Schools Tr...

Страница 37: ... the ON OFF button Chiller Operation Without the HMI The Human Machine Interface HMI communicates with the unit control processor displaying data and transmitting touch screen inputs to the controllers It does no actual controlling and the chiller can operate without it Should the touch screen become inoperable no commands are necessary for continuing unit operation All normal inputs and outputs w...

Страница 38: ...1 and 2 for dual compressor units is Mode followed by State followed by the Source device or signal The possible combinations are shown in Table 12 Table 12 Compressor Status Possibilities Complete STATUS Text in priority sequence Notes OFF Manual Switch Reason for the compressor being off OFF Compressor Alarm OFF Unit State OFF Evap Flow Re circulate OFF Low Oil Sump Temp OFF Start to Start Timer...

Страница 39: ... 0 without Full Metering Option IV Alarm The ALARM icon will turn red and begin flashing should an alarm occur This red ALARM button will appear on all screens in the case of an alarm See Figure 41 for an example of an active alarm alert For more information on alarms see page 58 Figure 41 Active Alarm Icon Additional HMI View Screens Pressing the Detail Tab on the top of the Home View Screen prov...

Страница 40: ...L WATER CHILLERS 40 www DaikinApplied com Operation Figure 43 Evaporator Information Figure 44 Compressor Details NOTE Chiller data will populate in the Power box if the Full Metering capability has been installed and wired ...

Страница 41: ...To open the vanes loading compressor solenoid SA is de energized and SB is energized allowing oil flow from port SA to one side of the piston other side drains through port SB To close the vanes unload compressor valve SB is de energized and valve SA is energized to move the piston and vanes toward the unload position When both solenoid valves SA and SB are de energized full oil pressure is direct...

Страница 42: ...s available for metering by the hot gas regulating valve This hot gas provides a stable refrigerant flow and keeps the chiller from short cycling under light load conditions while also reducing surge potential on heat recovery units The factory default setpoints for bringing on hot gas bypass are adjustable on Settings Modes tab shown on Figure 54 Settings View Modes on page 48 Surge and Stall Sta...

Страница 43: ...Operation www DaikinApplied com 43 IOM 1274 3 CENTRIFUGAL WATER CHILLERS Figure 46 Typical Oil Flow Diagram Models WSC TSC HSC 079 126 ...

Страница 44: ...IOM 1274 3 CENTRIFUGAL WATER CHILLERS 44 www DaikinApplied com Operation Figure 47 Condenser Information Figure 48 Expansion Valve Information ...

Страница 45: ...tc 2 MODES selects various unit parameters such as liquid injection timers pump staging control source unit mode etc 3 MOTOR selects power related setpoints such as amp limits 4 TOWER selects the method of controlling the cooling tower and sets the parameters for fan staging VFD 5 ALARMS sets the limit and shutdown alarms 6 TIMERS sets the amount of time the evaporator pump must run before a compr...

Страница 46: ...or decrease the value displayed Some setpoints are selectable text menus rather than numeric values Select the desired option using the drop down menu that appears on that particular setpoint Toggle between choices using the UP or DOWN button If dashed lines appear in the setpoint window it means that toggling in that direction can go no further so reverse direction For all of the methods listed a...

Страница 47: ...CE mode Leaving Water Temp Heat 135 0 F 66 0 to 150 0 F O Sets control target for condenser leaving water temperature in HEAT mode No Start Water Source 70 F 30 to 100 F O Minimum temperature for starting a Templifier unit Delta Reset Water Source 55 0 F 50 to 100 F O Setting for Templifier models Leaving Water Temperature LWT Reset The Active Leaving Water variable shall be set to the current Lea...

Страница 48: ...ce hours between 1 and 2 1 Primary 2 Primary if primary fails use other Evaporator Pump Pump 1 Only Pump 1 Only Pump 2 Only Auto Lead 1 Primary 2 Primary M Pump 1 Only Pump 2 Only use only these pumps AUTO balance hours between 1 and 2 1 Primary 2 Primary if primary fails use other Stage Mode Normal Normal Hi Eff Pump Standby M Normal Fixed sequence and or balance starts hours Hi Eff Starts compre...

Страница 49: ...rease is inhibited Min Leaving Water Temp Rate 0 1 F min 0 1 to 5 0 F min M Sets value below which an additional compressor can stage on Demand Limit Enable OFF ON OFF M ON Limits RLA to a value set by the Demand Limit analog input where 4 mA 70 RLA 20 mA 100 RLA OFF The Demand Limit input is ignored Minimum Amps 39 5 to 80 M Sets RLA below which unloading is inhibited Maximum Amps 100 10 to 100 M...

Страница 50: ...FD stage or valve SP VFD stage VFD Stage Up 80 0 to 100 T Valve position above which the fans can stage up Tower Valve Fan VFD Strategy Valve Stage VFD speed above which the fans can stage up Tower Valve Fan VFD Strategy VFD or valve SP VFD stage Cooling Tower Control None None Temperature Lift T None No tower control Temperature Fan and valve controlled by condenser EWT Lift Controlled by lift pr...

Страница 51: ... 16 on page 50 Setpoint for Cooling Tower Control on the TOWER Setpoint Screen sets the type of control NONE is selected as default Choose TEMPERATURE for entering condenser water control or LIFT to define the lift pressure between the Evaporator Pressure and the Condenser Pressure Setpoint for Tower Valve Fan VFD Strategy on the TOWER Setpoint Screen defines if and how the two MicroTech Analog Ou...

Страница 52: ...The default is 10 3 Set the Valve Control Range to the maximum position to which the valve can go The default is 100 4 Set the Valve Control Error Gain The default is 20 5 Set the Valve Control Slope Gain The default is 1 F If LIFT was selected for Cooling Tower Control set the Valve Target Lift default is 30 psi This setpoint is usually 5 psi below the minimum fan stage setpoint established by St...

Страница 53: ...mperature EWT or LIFT pressure difference between the condenser and evaporator pressure Tower bypass or fan speed are not controlled See Figure 63 and Figure 64 To set up in HMI The following settings are used for the Tower Fan Staging Only mode 1 Select TEMP if Cooling Tower Control is based on condenser EWT or LIFT if based on compressor lift expressed in pressure 2 Set Tower Valve VFD as NONE f...

Страница 54: ...hen the VFD speed reaches the maximum value that was set In addition Figure 66 shows that the default temperature at which the valve opens completely is 65 F This temperature is the Valve SP also called Valve Target and is adjustable BAS Alternate In control strategies I through V the chiller MicroTech is directly controlling the cooling tower fan staging variable frequency drives and bypass valve...

Страница 55: ...acity increase is inhibited may need to be lowered if glycol is added to the system Similarly changing setpoint below 30 psi default requires glycol to be added to the system otherwise there is a risk of freezing the evaporator Low Suction Pressure Unload 31 psi 6 to 45 psi T Suction pressure value below which a forced capacity decrease occurs Low Suction Pressure Stop 29 psi 5 to 45 psi T Suction...

Страница 56: ...rom a stop to the next start Dwell Time 0 min 0 to 99 min T Delay Time Alarms are passed to BAS to allow time for chiller to reset before disabled by BAS Prelube Timer 30 sec 10 to 240 sec T Unload Timer 60 sec 5 to 300 sec T Postlube Timer 30 sec 10 to 240 sec T Figure 70 Settings View Commission Table 19 Unit Commissioning Settings Description Default Range PW Comments Heat Recovery Usage Disabl...

Страница 57: ...thernet BACnet Ethernet Ethernet BACnet MS TP RS485 NOTE It is likely that the chiller will contain the factory settings for date and time therefore it is important to verify or change these settings when the chiller is first used on the job site Failure to do so will result in incorrectly labeled History files The version numbers shown are the controllers software identification These numbers may...

Страница 58: ... 18 alarms for the current date with the most current alarms listed on top Each alarm displays the date stamp action taken and the cause of the alarm See the Alarm tables starting on page 60 for specifics on alarms that may occur Alarm history data is held for 365 days as shown on the Interface tab in Table 20 Clearing an Alarm There are two different indicators that the chiller will generate when...

Страница 59: ... Copy Service Trends is only available with the technician level password Copy Customer Trends is available for all password levels 5 Repeat this process for each desired day of history Each day must be downloaded individually It is not possible to download multiple days of history at once Viewing Using Trend History Files Trend history files can be recognized by Trend at the beginning of the file...

Страница 60: ...nser flow condenser pump off condenser head gasket leaking or missing sensor wiring fault condenser flow sensor failure Manual Sensor Fault Evap LWT Rapid Stop Sensor shorted or open Chilled water flow switch may be open Manual Sensor Fault Evap Sat Press Rapid Stop No Start Sensor shorted or open Check for loose wires or failed sensor Manual Sensor Fault Cond Sat Press Rapid Stop No Start Sensor ...

Страница 61: ... Evaporator Pressure Low Informative Message Pressure Low Evap Pressure Unload setpoint Auto Sensor Fault Liquid Line Informative Message Sensor is shorted or open Check for loose wires or failed sensor Unit continues to run performance may be affected Auto Sensor Fault Evap EWT Informative Message Auto Sensor Fault Cond EWT Informative Message Auto Sensor Fault Cond LWT Informative Message Auto I...

Страница 62: ...at Recovery Temp Chiller NTC Thermistor 10k 25 C 40 to 125 C Leaving Heat Recovery Temperature Chiller NTC Thermistor 10k 25 C 40 to 125 C NOTE 1 Wiring is to the compressor box 2 Sensor Range in Table 24 indicates the range of the input NOT the operating range of the chiller Table 25 Unit Controller Digital Inputs Description Wiring Signal Source States Open Closed Front Panel Stop Auto Unit Swit...

Страница 63: ...stor 10k 25 C 40 to 125 C Table 29 Compressor Controller Digital Inputs Description Signal States Open Closed Compressor Switch Manual Off 0 to 24 VAC Stop Auto Mech High Pressure 0 to 24 VAC High Pressure Ok Motor High Temperature 0 to 24 VAC High Temp Ok Vanes Closed Switch 0 to 24 VAC Not Closed Closed Starter Transition 0 to 24 VAC No Transition Transition Starter Fault 0 to 24 VAC Fault No Fa...

Страница 64: ...n the event that repair work becomes necessary to the oil pump or unless a large amount of oil is lost from the system due to a leak If oil must be added with the system under pressure use a hand pump with its discharge line connected to the backseat port of the valve in the lubricant drain from the compressor to the sump The POE oils used with R 134a and R 513A are hygroscopic and care must be ex...

Страница 65: ... compared to nameplate RLA value Normally the actual current will be lower since the nameplate rating represents full load operation Also check all pump and fan motor amperages and compare with nameplate ratings 2 Inspection must verify that the oil heaters are operative The heaters are insert cartridge type and can be checked by ammeter reading They should be energized whenever power is available...

Страница 66: ... this resistance will provide a record of any deterioration of the winding insulation All new units have well over 100 megohms resistance between any motor terminal and ground Whenever great discrepancies in readings occur or uniform readings of less than 50 megohms are obtained the motor cover must be removed for inspection of the winding prior to starting the unit Uniform readings of less than 5...

Страница 67: ...remaining from the first pulldown and after the third only 1 10 1 noncondensables will remain Charging the System WSC water chillers are leak tested at the factory and shipped with the correct charge of refrigerant as indicated on the unit nameplate In the event the refrigerant charge was lost due to shipping damage the system should be charged as follows after first repairing the leaks and evacua...

Страница 68: ...s The source if any may be from additives in some mineral oils Lead The source of lead in Daikin Applied centrifugal chillers is the thread sealant compounds used during chiller assembly The presence of lead in the lubricating oil in Daikin Applied chillers does not indicate bearing wear Silicon Silicon can originate from residual particles of silicon left from the manufacturing process filter dri...

Страница 69: ...erval Flow Switch Installation and Calibration A thermal dispersion flow switch uses heat to determine flow and therefore must be calibrated during system startup A thermal dispersion flow switch can be an acceptable replacement for paddle type flow switches and differential pressure switches but care must be taken regarding wiring The thermal dispersion flow switch supplied by Daikin Applied show...

Страница 70: ...w switch The Teach function is initiated by holding down the minus button on the face of the flow switch for 15 seconds During this 15 second period LEDs 0 and 9 will be lit green Once the Teach function is completed the outer LEDs will flash green as shown in 2 Figure 78 Automatic Teach of Setpoint 3 After the Teach function is completed and the outer LEDs flashed the flow switch will indicate a ...

Страница 71: ... lowered than desired flow Figure 81 Display for Flow Below Range Flow above display range The SP LED will be lit amber all LEDs to the left and right of the SP LED with be green with the rightmost LED flashing green For example if the SP was set to 200 cm s the flashing LED labeled 9 would indicate that the flow was above 230 cm s This may be a normal display depending on range by which flow vari...

Страница 72: ...would indicate that excessive tube fouling could be present Higher than normal discharge pressure and motor current are also good indicators 3 Evaporators in closed fluid circuits with treated water or anti freeze are not normally subject to fouling hover it is prudent to check the approach periodically Some evaporators may have a mixture of inch and 1 inch tubes 4 Performed when contracted for no...

Страница 73: ... www DaikinApplied com 73 IOM 1274 3 CENTRIFUGAL WATER CHILLERS ...

Страница 74: ...IOM 1274 3 CENTRIFUGAL WATER CHILLERS 74 www DaikinApplied com ...

Страница 75: ...h above such free labor does not include diagnostic visits inspections travel time and related expenses or unusual access time or costs required by product location 2 Refrigerants fluids oils and expendable items such as filters are not covered by this warranty 3 This warranty shall not apply to products or parts which a have been opened disassembled repaired or altered by anyone other than Compan...

Страница 76: ...is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local Daikin Applied representative for warranty details To find your local Daikin Applied representative go to www DaikinApplied com Aftermarket Services To find your local parts office visit www DaikinApplied com or call 800 37PARTS 800 377 2787 To find your local service office visit ww...

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