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McQuay Magnitude C Vintage, Installation, Operation And Maintenance Manual

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McQuay Magnitude C Vintage Installation, Operation And Maintenance Manual Download Page 40

IOM 1210-1 • MAGNITUDE

®

 MODEL WMC CHILLERS 

38 www.DaikinApplied.com

o

peraTIon

MODES Setpoints

Figure 44: MODES Setpoint Screen  

NOTE: 

Grayed out setpoints do not apply to this model chiller.

Table 10: MODES Setpoint Settings

Description

No .

Default

Range

Password

Comments

Compr # 2 Stage Sequence #

14

1

1,2, … (# of 

Compressors)

M

Sets sequence number for # 2 compressor. If set to 1, it is always 

first to start. If set to 2, it is always second to start. (Note 1)

Compr # 2 Staging Mode

13

Normal

Normal, Efficiency, 

Pump, Standby

M

Normal uses standard sequencing, Efficiency starts one 

compressor on each unit, Pump starts all compressors on one 

chiller first, Standby uses this compressor only if another fails

Compr #1 Stage Sequence # 

12

1

1,2, … (# of 

Compressors)

M

Sets sequence number for # 1 compressor. If set to 1, it is always 

first to start. If set to 2, it is always second to start. (Note 1)

Compr #1 Staging Mode

11

Normal

Normal, Efficiency, 

Pump, Standby

M

Normal uses standard sequencing, Efficiency starts one 

compressor on each unit, Pump starts all compressors on one 

chiller first, Standby uses this compressor only if another fails

Maximum Compressors ON

10

1

1-8

M

Total number of compressors allowed to run at one time 

BAS Network Protocol

9

MODBUS

None, Local, BACnet, 

LonWorks, MODBUS, 

Remote

M

Sets BAS Standard Protocol to be used, or LOCAL if none

Condenser Pump

6

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

Evaporator Pump

5

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

Control Source

3

Switches

Switches, Local, BAS

O

Sets control source. See 

"Unit Enabling/Disabling" on page 20

.

Unit Enable

1

OFF

OFF, AUTO

O

OFF, everything is off. AUTO, Evap pump on, comp, cond pump 

and tower on as required to meet LWT

NOTES: 

1.  If both compressors have the same sequence number, they will automatically balance starts and run-hours.
2.  Setpoints 11 through 14 display compressor staging strategy.

Summary of Contents for Magnitude C Vintage

Page 1: ...tion and Maintenance Manual Magnitude Magnetic Bearing Centrifugal Chillers Model WMC C Vintage 125 to 400 Tons 440 to 1400 kW HFC 134a Refrigerant 50 60 Hz IOM 1210 1 Group Chiller Part Number IOM1210 1 Date August 2014 ...

Page 2: ...Operation 20 Operator Responsibilities 20 Operator Schools 20 Sequence of Unit Operation 20 Unit Enabling Disabling 20 Operator Interface Touch Screen OITS 21 The Controller 48 Building Automation Systems BAS 58 Use with On Site Generators 58 Maintenance 59 Service Programs 59 Chiller Maintenance 59 Seasonal Shutdown 59 Seasonal Startup 59 Maintenance Schedule 60 Appendix 61 Definitions 61 Tempera...

Page 3: ...ectrical 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 Document Attach...

Page 4: ......

Page 5: ...ervice work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy If not installed and used in accordance with this instruction manual it may cause interference with radio communications Operation of this equipment in a residential area is likely to cause harmful interfere...

Page 6: ...n and increasing reliability Necessary equipment protection and operating controls are included All McQuay International centrifugal chillers must be commissioned by a factory trained McQuay International service technician Failure to follow this startup procedure can affect the equipment warranty The standard limited warranty on this equipment covers parts that prove defective in material or work...

Page 7: ...MicroTech II unit controller is to acquire and process data relating to chiller operation issue instructions to various components of the chiller and maintain controlled operation of the chiller As a part of operating the chiller successfully the unit controller offers necessary condenser water control See Condenser Water Temperature Control on page 9 for more information The controller is located...

Page 8: ... must also be capable of supporting 1 5 times the shipping weight of the unit If a knockdown option was ordered on the unit reference the Knockdown Installation Manual for more information Nameplates There are several identification nameplates on the chiller The unit nameplate is located on the Unit Control Panel Both the Model No and Serial No are unique to the unit and will identify it These num...

Page 9: ... mm Width in mm Height in mm Shipping Weight lb kg WMC125S E2209 C2009 134 3 3411 43 5 1105 81 0 2057 5086 2307 WMC145S E2209 C2009 134 3 3411 43 5 1105 81 0 2057 5586 2534 WMC145D E2209 C2009 134 3 3411 43 5 1105 80 8 2052 6760 3066 WMC150D E2212 C2012 169 2 4298 43 5 1105 80 8 2052 7709 3497 WMC200S E2609 C2209 134 2 3409 47 2 1199 82 9 2106 6705 3041 WMC225D E2609 C2209 134 2 3409 47 2 1199 83 ...

Page 10: ...if welding is performed on a vessel shell or tube sheet The water heads can be interchanged end for end so that the water connections can be made at either end of the unit If this is done use new head gaskets and relocate the control sensors Field installed water piping to the chiller must include air vents at the high points a cleanable 20 mesh water strainer in water inlet lines a flow proving d...

Page 11: ...peration 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...

Page 12: ... connectors Remove plastic shipping plugs if installed from the inside of the valves prior to making pipe connections Whenever vent piping is installed the lines must be in accordance with local code requirements where local codes do not apply the latest issue of ANSI ASHRAE Standard 15 code recommendations must be followed Condenser Relief Valves As stated previously and as shown in Figure 8 cond...

Page 13: ...and licensed electricians must perform wiring An electrical shock hazard exists that can cause severe injury or death The field power wiring required varies depending on unit model See Figure 12 Wiring Index on page 12 Figure 13 Controller Box Wiring on page 14 and Figure 14 Power Box Single and Multi Point Wiring on page 16 for wiring information These wiring diagrams are also provided with the c...

Page 14: ...IOM 1210 1 MAGNITUDE MODEL WMC CHILLERS 12 www DaikinApplied com Installation Figure 12 Wiring Index ...

Page 15: ...www DaikinApplied com 13 IOM 1210 1 MAGNITUDE MODEL WMC CHILLERS Installation ...

Page 16: ...IOM 1210 1 MAGNITUDE MODEL WMC CHILLERS 14 www DaikinApplied com Installation Figure 13 Controller Box Wiring ...

Page 17: ...UMPERS WJ1 AND WJ2 MUST ONLY BE CONNECTED TO TERMINAL BLOCK 33 CHILLER FACTORY ASSEMBLY IF OPTIONAL GFP1 IS USED THEN REMOVE JUMPER WJ1 OTHERWISE COMPLETE CONNECTION WJ1 TO TERMINAL BOLOCK 38 IF OPTIONAL GFP2 IS USED THEN REMOVE JUMPER WJ2 OTHERWISE COMPLETE CONNECTION WJ2 TO TERMINAL BOLOCK 39 Installation ...

Page 18: ...IOM 1210 1 MAGNITUDE MODEL WMC CHILLERS 16 www DaikinApplied com Installation Figure 14 Power Box Single and Multi Point Wiring ...

Page 19: ...www DaikinApplied com 17 IOM 1210 1 MAGNITUDE MODEL WMC CHILLERS Installation ...

Page 20: ... or to B or C vintage chillers consult a McQuay International service representative WMC chillers cannot be pLAN interconnected with WSC WDC WCC or WME centrifugal chillers Long Term Storage This information applies to new units being stored waiting for startup or to existing units that may be inoperative for an extended period of time The chiller must be stored in a dry location indoors and prote...

Page 21: ...s and controls wired Wiring complies with National Electrical 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 ava...

Page 22: ...osition and impeller speed Maximum capacity at a given operating condition can be found either when the compressors have reached their maximum speed limit Mechanical limitation or when the compressors have reached the chiller s Rated Load Amperage Electrical limitation 6 Dual compressor unloading As load decreases the compressors will unload to sustain the water temperature set point by reducing s...

Page 23: ...in a similar manner as the Unit Switch If the Control Source on the OITS MODES Setpoint Screen is set to Local press the STOP button on the OITS to disable the chiller This method of disabling will cause the chiller to act in a similar manner as when it is disabled using the Unit Switch in the Switches or BAS mode Operator Interface Touch Screen OITS The following sections outline the operation of...

Page 24: ...etails For more information on alarms see page 42 through page 47 II Information Chilled water setpoint ACTIVE LWT SETPOINT Entering and leaving evaporator water temperatures Entering and leaving condenser water temperatures Percent unit RLA UNIT STATUS which is MODE followed by STATE followed by the SOURCE that is the device or signal that created the STATE The possible combinations are shown in ...

Page 25: ...Screen Figure 49 on page 41 and the Alarm History Screen Figure 50 on page 42 VIEW button Shows details about the unit status and conditions Pressing this button will toggle between the Home View Screen Figure 16 and the Detail View Screen Figure 17 SET button Toggles between the Setpoint Screens descriptions start on page 26 that are used for changing setpoints and the Service Screen Figure 47 on...

Page 26: ... Use the COMP button to toggle between the two compressors data Many of the inputs and outputs shown in the Compressor Inputs Outputs Information will also appear under the Compressor State Information Figure 18 since they are part of the startup sequence and define the compressor state at any given time Figure 19 Compressor Inputs Outputs Information Pressing the POWER button on the Detail View S...

Page 27: ...I O Unit I O EVAP or COND buttons will display the same information as what is available from the Detail View Screen Reference the Information figures in the Detail View Screen section starting on page 23 for more details The Bar Graphs Screen Figure 25 is accessed by pressing the BAR GRAPHS button from the View Menu Screen Figure 24 If information is present on the right side of the View Menu Scr...

Page 28: ...ain will toggle to the Service Screen shown in Figure 47 on page 40 A typical Setpoint Screen is displayed in Figure 26 below Figure 26 A Typical Setpoint Screen Figure 26 shows the WATER Setpoint Screen The various setpoint groups are in a column on the right side of the screen Each button contains a number of setpoints grouped together by similar content The WATER button for example contains var...

Page 29: ...turn green 7 Setpoints with numeric values can be changed in two ways Select the desired value by pressing the numbered buttons on the Numeric Keypad Press ENTER to enter the value or CANCEL to cancel the transaction Press the UP or DOWN button to increase or decrease the value displayed Press ENTER to enter the value or CANCEL to cancel the transaction Some setpoints are text rather than numeric ...

Page 30: ...nterlock confirmation from compressor Stop Start Timer 3 3 min 3 to 20 min M Time from when compressor stops to when it can restart Start Start Timer 2 40 min 15 to 60 min M Time from when compressor starts to when it can start again Evap Recirculate Timer 1 30 sec 0 2 to 5 min M Time that evaporator pump must run before compressor start NOTE In Table 5 and in the rest of the Setpoint tables on th...

Page 31: ... start Surge Temperature Limit 7 50 F 2 to 45 F T At start Surge Temp ST is compared to this SP Alarm at ST 2x SP High Discharge Temp Stop 6 190 F 120 to 240 F T Max discharge temp to shut down compressor High Discharge Temp Load 5 170 F 120 to 240 F T Sets discharge temp above which a forced capacity increase occurs High Condenser Pressure 4 140 psi 120 to 240 psi T Max discharge pressure stop co...

Page 32: ...mum Start Position 8 10 0 to 100 T Initial position of valve when condenser EWT is at or below Setpoint 9 Stage Down 7 20 0 to 100 T Valve position below which the fans can stage down Tower Setpoint 2 Valve Stage Down VFD speed below which the next fan speed can turn off Tower Setpoint 2 valve VFD Stage Up 6 80 0 to 100 T Valve position above which the fans can stage up Tower Setpoint 2 Valve Stag...

Page 33: ... 8 70 F 40 to 120 F M Temperature for fan stage 1 on Stage Differential Lift 7 6 0 psi 1 0 to 20 0 psi M Fan staging deadband with Setpoint 1 Lift Stage Differential Temp 6 3 0 F 1 0 to 10 0 F M Fan staging deadband with Setpoint 1 Temp Fan Stage Down Time 5 5 min 1 to 60 min M Time delay between stage up down event and next stage down Fan Stage Up Time 4 2 min 1 to 60 min M Time delay between sta...

Page 34: ...rature vs Fan Stages II VALVE SP This control strategy is tower staging up to four stages with a low limit controlled bypass valve The tower fans are controlled as in I plus a tower bypass valve is controlled to provide a minimum condenser EWT There is no interconnection between the fan control and the valve control See Figure 34 and Figure 35 Figure 34 TOWER Setpoint SP2 II VALVE SP Figure 35 II ...

Page 35: ...er fan control with a VFD and bypass valve control See Figure 40 and Figure 41 Figure 40 TOWER Setpoint SP2 V VALVE SP VFD STAGE Figure 41 V VALVE SP VFD STAGE Percent vs Temperature As shown in Figure 41 the default minimum and maximum VFD speeds are 20 and 100 respectively These minimum and maximum values are adjustable anywhere between 0 and 100 Additional fans stage on when the VFD speed reach...

Page 36: ...Quay International startup technician Setup instructions for each of the five tower control strategies are provided next I NONE Tower Fan Staging Only This is the default setting but it is NOT a recommended control strategy The following settings are used for the Tower Fan Staging Only mode SP setpoint A TOWER Setpoint Screen 1 SP1 Select TEMP if control is based on condenser EWT or LIFT if based ...

Page 37: ...c dealing with system fluid mass component size and other factors affecting the reaction of the system to control inputs To avoid possible equipment damage these setpoints should be set by personnel experienced with setting up this type of control III VALVE STAGE Tower staging with bypass valve controlled by fan stage A TOWER Setpoint Screen 1 Use all of the same setpoint settings as those outline...

Page 38: ... load point RLA set in SP 5 to 100 RLA Initial Soft Load Limit 6 40 10 to 100 M Initial amps as of RLA Uses SP4 6 Soft Load Enable 5 OFF OFF ON M Soft load on or off Uses SP6 7 Nameplate RLA 4 Dependent on dataplate T RLA value from compressor nameplate Maximum Amps 3 100 10 to 100 T RLA above which loading is inhibited Load Limit SP 5 unloads compressor Minimum Amps 2 40 5 to 80 T RLA below which...

Page 39: ...mps setpoint over the amount of time specified by the Soft Load Ramp setpoint If the amp draw rises above the currently active soft load limit value the unit will inhibit capacity increases If the amp draw rises to 3 or more above this value the unit will begin capacity decreases Maximum LWT Rate The maximum rate at which the leaving water temperature can drop chiller mode COOL is limited at all t...

Page 40: ... one compressor on each unit Pump starts all compressors on one chiller first Standby uses this compressor only if another fails Maximum Compressors ON 10 1 1 8 M Total number of compressors allowed to run at one time BAS Network Protocol 9 MODBUS None Local BACnet LonWorks MODBUS Remote M Sets BAS Standard Protocol to be used or LOCAL if none Condenser Pump 6 Pump 1 Only Pump 1 Only Pump 2 Only A...

Page 41: ...t Reset Delta T 8 10 0 F 0 0 to 20 0 F M Sets the evap delta T above which Return reset begins LWT Reset Type 7 NONE NONE RETURN 4 20mA M Select reset type NONE for none RETURN for resetting chilled water based on the entering water or 4 20 mA for external analog signal Stage Delta T 6 1 0 0 5 to 5 F M Sets the temperature the leaving water must be above setpoint for next compressor to start Start...

Page 42: ...een Figure 47 is accessed by pressing the SET button from any SET screen In other words it is the second SET screen While containing information and activity buttons for the service technician it also has valuable information for the operator Figure 47 Service Screen The upper left corner of the Service Screen contains compressor information such as operating hours and number of starts for each co...

Page 43: ...he HISTORY button at the bottom of any screen that contains this button The HISTORY button will toggle between the Trend History Screen and the Alarm History Screen discussed next Figure 49 Trend History Screen The Trend History Screen allows the user to view the various parameters listed on the right side of the screen The temperature scale in F is on the left Pressure in psi and RLA are represen...

Page 44: ...0 via USB In order to download the trend or alarm history first insert a USB drive into the left side of the OITS PC see Figure 3 on page 5 if help is needed to identify the OITS PC The OITS PC will have two USB ports Insert the USB drive into the USB port closer to the front of the OITS PC NOTE In order to prevent viruses from being transferred from the USB drive to the OITS it is important that ...

Page 45: ...m history files are saved from the OITS PC as csv files These files can be opened on a normal PC and manipulated using Microsoft Excel for personal use If tech support is requested the original un manipulated csv files must be sent to Daikin Applied Any other file formats are NOT accepted Active Alarms Screen The Active Alarms Screen Figure 52 is only accessible when an active alarm exists on the ...

Page 46: ... 1 COMPR STOP Motor Current Low Auto clears Low Motor Current Comp 2 COMPR STOP Motor Current Low Auto clears No Condenser Water Flow COMPR STOP Condenser Water Flow Loss Auto clears No Compressor Stop Comp 1 COMPR STOP Current High with Compr OFF Auto clears No Compressor Stop Comp 2 COMPR STOP Current High with Compr OFF Auto clears No Evaporator Water Flow COMPR STOP Evaporator Water Flow Loss ...

Page 47: ...if Tripped 3x in 50 min High Discharge Temperature Circuit 1 COMPR STOP Discharge Temperature High Auto clears Locked off if Tripped 3x in 50 min High Discharge Temperature Circuit 2 COMPR STOP Discharge Temperature High Auto clears Locked off if Tripped 3x in 50 min Starter Fault Compressor 1 COMPR STOP Compressor Fault previously used for WMC general compressor fault Reset is dependent on specif...

Page 48: ... Warning Alarms Description OITS Alarm Message Alarm Reset Entering Condenser Water Temperature Sensor Fault NO ACTION Condenser EWT Out of Range Auto clears Entering Evaporator Water Temperature Sensor Fault NO ACTION Evaporator EWT Out of Range Auto clears Liquid Line Refrigerant Temperature Sensor Fault NO ACTION Liquid Line Temp Out of Range Auto clears Leaving Condenser Water Temperature Sens...

Page 49: ...ert shown on OITS panel No Alarm Re Start Fault No Alert shown on OITS panel No Alarm Re Start Fault Circuit 1 No Alert shown on OITS panel No Alarm Re Start Fault Circuit 2 No Alert shown on OITS panel No Alarm Table 18 Compressor Events Description OITS Alarm Message Alarm Reset Bearing Fault 1 COMPR STOP Compressor Fault Auto clears Pauses 20 min after 3rd alarm in 50 min Bearing Fault 2 COMPR ...

Page 50: ...sub screens located under them There are two ways to navigate the menu matrix Hierarchical and Scrolled Menu Structure Hierarchical The hierarchical menu structure allows the operator to use shortcuts in order to navigate to any particular menu screen Each menu screen can have up to four lines of information The following steps outline screen navigation using the hierarchical method 1 Press the ME...

Page 51: ... the screens are arranged logically in a matrix as shown in Table 19 on page 50 In the scroll mode there will be a blinking cursor located at the top left of the screen The controller holds memory during scroll navigation to make it easier to compare two screens to one another Take the example of comparing the following two screens VIEW COMP 7 Hours 00000 x10 Starts 00000 VIEW COMP 2 7 Hours 00000...

Page 52: ...0 0 000 0 SatCond 000 0 000 0 VIEW COMP 2 6 psi F SatEvap 000 0 000 0 SatCond 000 0 000 0 VIEW COMP 7 Hours 00000 x10 Starts 00000 VIEW COMP 2 7 Hours 00000 x10 Starts 00000 VIEWCOMP 8 HWLok Interlock Open Mode3 Units0 Float0 Auto Demand 000 0 VIEWCOMP 2 8 HWLok Interlock Open Mode3 Units0 Float0 Auto Demand 000 0 VIEW COMP 9 Alarms Ctl OIDSPACTRBZLGEVM Control Alarm Index X Definition VIEW COMP 2...

Page 53: ...one Valve Type NC I I v SET UNIT SPs 5 Rest Type NONE MaxResetDT 00 0 F StrtResetDT 10 0 F SET COMP SPs 5 Lead Staging 030 Nom Capacity 0100T HG Bypass 30 RLA SET COMP 2 SPs 5 Nom Capacity 0100T HG Bypass 30 SET ALARM LMTs 5 Evap Freeze 34 0 F Cond Freeze 34 0 F SET TOWER SPs 5 Valve Sp 065 F Reset 20 0psi Sensor ECWT B3 I I v SET UNIT SPs 6 Soft Load OFF InitialSLAmps 020 SoftLoadRamp 05min SET C...

Page 54: ...wo methods will cause the following screen to be displayed The gray background indicates where the blinking cursor will be The second row will say either Enter Operator Enter Manager or Enter Technician depending on the password level required for the screen that was on the controller prior to accessing the SET PASSWORD screen SET PASSWORD Enter Password 00000 No Access Given Once the SET PASSWORD...

Page 55: ...abling see Unit Enabling Disabling on page 20 Clearing Alarms If the LEFT arrow key on the controller turns red it is an indication that there is an alarm Alarms can be cleared from the unit controller with the following commands see Figure 53 Controller Keypad on page 48 for the location of various keys and key pathways on the controller 1 Press the MENU key 2 Select ALARM using the LEFT arrow ke...

Page 56: ...the range of the input NOT the operating range of the chiller Table 21 Controller Digital Inputs Description Signal Signal 1 Unit OFF Switch 0 VAC Stop 24 VAC Auto 2 Remote Off Enable 0 VAC Stop 24 VAC Enable 3 Mode Switch 0 VAC Normal 24 VAC Alternate 4 Manual Off 0 VAC Off 24 VAC Enable 5 Manual Off2 0 VAC Off 24 VAC Enable 6 Manual Off3 0 VAC Off 24 VAC Enable 7 Manual Off4 0 VAC Off 24 VAC Ena...

Page 57: ...he password that must be active in order to change the setpoint The letters in the Password column refer to the following O Operator the password number for operator level is 100 M Manager the password number for manager level is 2001 T Technician the password number for technician level is only provided to McQuay International technicians Table 24 Controller Setpoints Description Default Range PW...

Page 58: ...n Time 5 min 1 to 60 min T Stage Differential Temp 3 0 F 1 0 to 10 0 F T Stage Differential Lift 6 0 psi 1 0 to 20 0 psi T Stage 1 On Temp 70 F 40 to 120 F T Stage 2 On Temp 75 F 40 to 120 F T Stage 3 On Temp 80 F 40 to 120 F T Stage 4 On Temp 85 F 40 to 120 F T Stage 1 On Lift 35 psi 10 to 130 psi T Stage 2 On Lift 45 psi 10 to 130 psi T Stage 3 On Lift 55 psi 10 to 130 psi T Stage 4 On Lift 65 p...

Page 59: ...10 psi 0 to 20 0 psi T Tower Reset Lift 5 0 F 0 to 10 0 F T Sensor Selection ECWT B3 ECWT B3 provided or EHRT B9 not provided T Alarms Evaporator Freeze 34 0 F 9 0 to 45 0 F T Condenser Freeze 34 0 F 9 0 to 45 0 F T Low Evap Pressure Stop 25 psi 5 to 45 psi T Low Evap Pressure Inhibit 30 psi 7 to 45 psi T Low Evap Pressure Unload 29 psi 6 to 45 psi T High Discharge Temperature Shutdown 190 F 120 t...

Page 60: ...re they may be required to run with on site electrical generators This is particularly true when the generators are used for temporary power when the utility power is lost Generator Sizing Gas and diesel generators are sensitive to the compressor s locked rotor characteristics when the chillers start up Use the electrical data supplied with the performance output sheet obtained from the McQuay Int...

Page 61: ... handling standard waterboxes follows only qualified service personnel should perform these tasks After draining water remove all but two head bolts at roughly 10 and 2 o clock Loosen the remaining two bolts to enable the head to be separated from the tube sheet sufficiently for a clevis pin or hook to be inserted into an open bolt hole at the top of the head Attach a hoist to the pin or hook lift...

Page 62: ... D Perform MicroTech II check log and last fault analysis X III Condenser A Confirm correct water flow and pressure drop O X B Confirm appropriate water treatment O C Clean and Leak Test condenser tubes X X X D Eddy Current Test tube wall thickness X E Seasonal Protection X IV Evaporator A Confirm correct water flow and pressure drop O X B Confirm appropriate water treatment O C Clean and Leak Tes...

Page 63: ...previous value over a rolling one minute interval Error In the context of this manual Error is the difference between the actual value of a variable and the target setting or setpoint Evaporator Condenser Approach The evaporator condenser approach is calculated for each circuit The equation is as follows Approach LWT Saturated Temperature Evap Hold loading This is a setpoint that establishes the m...

Page 64: ...ler s run status is continuously stored in battery backed RAM When power is returned to the compressors it checks the status of this function and if enabled it then checks if the chiller was running when power was lost If so it clears timers enables the pumps and clears power loss alarms Evaporator water flow must be detected before the compressor is allowed to start the re circulation timer will ...

Page 65: ...Suction superheat is calculated for each circuit using the following equation Suction Superheat Suction Temperature Evaporator Saturated Temperature VDC Volts Direct Current sometimes noted as vdc VFD Variable Frequency Drive a device located on the compressor used to vary the compressor speed ...

Page 66: ... 0 94 112 0 134 210 5 16 15 7 56 52 4 96 115 9 136 216 6 18 17 1 58 54 9 98 120 0 138 222 8 20 18 4 60 57 4 100 124 1 140 229 2 22 19 9 62 60 0 102 128 4 142 235 6 24 21 3 64 62 7 104 132 7 144 242 2 26 22 9 66 65 4 106 137 2 146 249 0 28 24 5 68 68 2 108 141 7 148 255 8 30 26 1 70 71 1 110 146 3 150 262 8 32 27 8 72 74 0 112 151 1 152 270 0 34 29 5 74 77 1 114 155 9 154 277 3 36 31 3 76 80 2 116 ...

Page 67: ......

Page 68: ...old pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local McQuay International representative for warranty details To find your local McQuay International 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 ...

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