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OM AGSD-1

Circuit Functions

Calculations

Refrigerant Saturated Temperature

Refrigerant saturated temperature is calculated from the pressure sensor readings for each
circuit. The pressure is fitted to a curve made up of 12 straight-line segments. The points
used to define these segments are shown in the following tables.

Evaporator Pressure Conversion:

Pressure (PSI)

Temperature (

0 -15.0

7.1 0

19.0 20.0

34.7 39.0

50.7 54.0

70.4 69.0

99.6 87.0

129.2 102.0

166.8 118.0

205.4 132.0

246.5 145.0

320.0 165.0

428.5 188.1

Condenser Pressure Conversion:

Pressure (PSI)

Temperature (

0 0.6

17.5 18.5

31.5 35.9

50.0 53.7

76.0 73.4

115.0 95.6

161.5 116.2

185.0 125.2

260.0 149.2

284.5 155.9

349.5 172.0

365.5 175.5

428.5 188.1

Evaporator Approach

The evaporator approach is calculated for each circuit. The equation is as follows:

Evaporator Approach = LWT – Evaporator Saturated Temperature

Suction Superheat

Suction superheat is calculated for each circuit using the following equation:

Suction superheat = Suction Temperature – Evaporator Saturated Temperature

Содержание AGS 225D

Страница 1: ...erating Manual OM AGSD 2 Group Chiller Part Number 331375401 Date July 2007 Supercedes OM AGSD 1 Air Cooled Screw Compressor Chiller AGS 225D through AGS 450D Software Version AGSG30101D 60 Hertz R 13...

Страница 2: ...enser Fan Control 45 EXV Control 47 Economizer Control 50 Alarms and Events 51 Unit Stop Alarms 51 Unit Events 52 Circuit Stop Alarms 52 Circuit Events 56 Alarm Logging 57 Event Logging 57 Using the C...

Страница 3: ...ve components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel...

Страница 4: ...stics to inform operators of warning and fault conditions in plain language All events and alarms are time and date stamped for identification of when the fault condition occurred In addition the oper...

Страница 5: ...panel is located on the front of the unit to the left of the power panel Figure 1 Control Panel Components Expansion Valve Drivers Circuit Breakers MicroTech II Controller CP1 MicroTech II Controller...

Страница 6: ...t such that a change in the variable occurring within the dead band range causes no action from the controller For example if a temperature setpoint is 44 F and it has a dead band of 2 degrees F nothi...

Страница 7: ...e total unit load among the running compressors on a unit or group of units Low Ambient Lockout Prevents the unit from operating or starting at ambient temperatures below the setpoint Low Pressure Unl...

Страница 8: ...McQuay screw compressors Suction Superheat Suction superheat is calculated for each circuit using the following equation Suction Superheat Suction Temperature Evaporator Saturated Temperature See page...

Страница 9: ...llers Figure 2 Keypad Air Conditioning ALARM VIEW SET Advanced The four arrow keys UP DOWN LEFT RIGHT have three modes of use 1 Scroll between data screens in the direction indicated by the arrows def...

Страница 10: ...gram NOTE RAI Remote Access Interface EXB Expansion Board Table 1 pLAN Addressing A pLAN is used to connect CP1 and CP2 Controller Address Dip Sw 1 Position Dip Sw 2 Position Dip Sw 3 Position Large 1...

Страница 11: ...will be Off Remote Switch When a unit alarm is active the unit status will be Off Unit Alarm In cases where no circuits are enabled the unit status will be Off All Cir Disabled If the chiller is enab...

Страница 12: ...ther two or three circuits running When only one circuit is running the load may drop off to the point where even minimum unit capacity is too much The load has been satisfied when the LWT drops below...

Страница 13: ...denser pressure from climbing too fast The circuit status will normally be Run Disc SH Low immediately after the compressor starts This compressor will be next on if it has the least starts of the com...

Страница 14: ...to Manual Unit Off the chiller will be disabled and the unit status will display OFF Keypad Disable Alarm The red alarm light in back of the left arrow key on the controller will be illuminated when o...

Страница 15: ...load continues to drop the electronic expansion valve will be stepped closed the solenoid valve will close and the refrigerant circuits will go through a pumpdown sequence As the evaporator pressure...

Страница 16: ...EMP SENSOR FIELD CONNECTION POINT FIELD PIPING SHOWN DASHED STUB TUBE SCHRADER VALVE FIELD CONNECTION POINT SUCTION SHUT OFF KING VALVE RELIEF VALVE SCHRADER VALVE CHARGING VALVE CHARGING VALVE STUB T...

Страница 17: ...on 2 EXV 1 0 10VDC 0 to 6386 steps 1000 steps resolution 3 VFD 2 0 10VDC 0 to 100 1000 steps resolution 4 EXV 2 0 10VDC 0 to 6386 steps 1000 steps resolution 5 Reserved for Ceechina VFD 1 future 0 10V...

Страница 18: ...22 Off Fans on 18 Fan motor 23 24 Off Fans on Expansion I O Controller 1 EXB1 is connected to CP1 for additional I O Analog Inputs Description Signal Source Expected Range 1 Suction Temperature 1 NTC...

Страница 19: ...n motor 15 16 Fans Off Fans On 2 Fan motor 17 18 19 Fans Off Fans On 3 Fan motor 25 26 Fans Off Fans On 4 Fan motor 27 28 29 Fans Off Fans On Expansion I O Controller 3 EXB3 is connected to CP1 for ad...

Страница 20: ...Open 10 Open Analog Outputs Description Output Signal Range 1 VFD 3 0 10VDC 0 to 100 1000 steps resolution 2 EXV 3 0 10VDC 0 to 6386 steps 1000 steps resolution 3 Open 4 Open 5 Open 6 Open Digital Inp...

Страница 21: ...3 Open Pumpdown 13 Open 14 Open 15 Open 16 Open 17 Open 18 Open Expansion I O Controller 5 EXB5 is connected to CP2 for additional I O Analog Inputs Description Signal Source Range 1 Suction Temperatu...

Страница 22: ...tory set to the Default value and can be adjusted to any value in the Range column The PW password column indicates the password that must be active in order to change the setpoint Description Default...

Страница 23: ...int 25 20 to 50 M Stage Up Delay 5 min 0 to 60 min M Max Comps Running 3 1 3 M Sequence Cir 1 1 1 3 M Sequence Cir 2 1 1 3 M Sequence Cir 3 1 1 3 M Alarm Limits Low Evap Pressure Unload 28 psi 0 26 to...

Страница 24: ...F M Stage 6 8 Off Deadband 5 1 20 o F M VFD Max Speed 100 90 to 110 M VFD Min Speed 25 20 to 60 M Forced Fantrol 1 2 1 to number of fans M Forced Fantrol 2 3 1 to number of fans M Forced Fantrol 3 4 1...

Страница 25: ...Stage 3 On Deadband 8 Stage 3 On Deadband 11 Stage 4 On Deadband 10 Stage 4 On Deadband 12 Stage 5 On Deadband 8 Stage 5 On Deadband 13 Stage 6 On Deadband 8 Stage 6 On Deadband 13 Stage 7 On Deadband...

Страница 26: ...t Capacity For applying unit capacity limits an estimate of total unit capacity is needed Unit capacity will be based on the estimated circuit capacities The unit capacity is calculated using the foll...

Страница 27: ...Mode and Source Unit Setpoints SET UNIT SPs 1 Enable On Mode COOL Source KEYPAD 1 The Enable field can only be used with Source Keypad To enable and disable the chiller through the keypad any other c...

Страница 28: ...KEYPAD NETWORK or SWITCHES When the Control Source is set to KEYPAD the Unit Mode will stay at its previous setting until changed by the operator When the Control Source is set to BAS the most recent...

Страница 29: ...uires any of the following Control source is keypad and the unit enable keypad setting is Off Control source is BAS and either the remote switch is Off or the BAS command is Off Control source is swit...

Страница 30: ...operation of the evaporator pump Figure 7 Evaporator Pump States Power ON OFF RUN START T1 T4 T2 T3 Evaporator Pump States T5 Transitions T1 Transition from Off to Start requires any of the following...

Страница 31: ...ode and any of the reset methods below are selected The type of reset in effect is determined by the LWT Reset Type setpoint The Active Leaving Water variable is sent to all circuits for capacity cont...

Страница 32: ...example of the operation of 4 20 reset in Cool mode is shown below 20 54 Cool LWT Set Point 44 4 4 20 mA Reset Cool Mode 0 Max Reset 10 Active LWT oF Reset Signal mA Reset Type OAT The Active Leaving...

Страница 33: ...l on the Demand Limit analog input at the unit controller This function is only enabled if the Demand Limit setpoint is set to ON As the signal varies from 4 mA up to 20 mA the maximum unit capacity c...

Страница 34: ...he baud rate is locked to 4800 Modbus With the protocol set to Modbus the baud rate and ident set points are accessible Available Parameters Types A Analog I Integer D Digital I O I Input only O Outpu...

Страница 35: ...mpressor select x x x I 35 I O Clock year x x I 36 I O Clock month x x I 37 I O Clock day of month x x I 38 I O Clock day of week x x I 39 I O Clock hours x x I 40 I O Clock minutes x x I 45 O Compres...

Страница 36: ...guage For the AGS the language can only be English so output is 1 Integer 30 indicates the software version and revision The hundreds digit represents the version and the remaining part represents the...

Страница 37: ...capacity limit The circuit available flag for each circuit is set when all the following are true Circuit is communicating on pLAN Unit Control Source BAS Remote switch is closed AND Unit switch is cl...

Страница 38: ...IM 735 LONWORKS Communication Module Installation IM 736 BACnet MSTP Communication Module Installation IM 837 BACnet IP Ethernet Communication Module Installation IM 743 Modbus Communication Module I...

Страница 39: ...4 0 70 4 69 0 99 6 87 0 129 2 102 0 166 8 118 0 205 4 132 0 246 5 145 0 320 0 165 0 428 5 188 1 Condenser Pressure Conversion Pressure PSI Temperature o F 0 0 6 17 5 18 5 31 5 35 9 50 0 53 7 76 0 73 4...

Страница 40: ...r should be next on If the sequence numbers are all the same the circuit with the lowest number of starts should be next on If the starts are equal and the sequence numbers are all the same the circui...

Страница 41: ...he first compressor starts a time equal to the stage up delay setpoint must pass before the next compressor is allowed to start The delay only applies when a compressor is already running If the first...

Страница 42: ...nce offset IF other compressor is flagged to be counted in load balance THEN Load Balance Offset slide target cir 1 target cir 2 target cir 3 target 3 ELSE Load Balance Offset 0 LWT Error LWT Error Le...

Страница 43: ...ent log when they occur Both remain active until the evaporator pressure rises above the hold setpoint plus 2 psi or the circuit goes to a state other than Run High Lift Pressure If the compressor is...

Страница 44: ...ssure has been reached or the pumpdown time has been exceeded Service Pumpdown If the option for a service pumpdown is enabled then on the next pumpdown the pressure setpoint will be 5 psi The circuit...

Страница 45: ...ntrol has been manual for four hours Condenser Fan Control The compressor must be running in order to stage fans on All running fans will turn off when compressor goes to the off state Saturated Conde...

Страница 46: ...th or Without VFD Option There are up to 8 stages of Fantrol available When the VFD option is selected the fan stage 1 is VFD enable Fan Staging For a 6 or 9 Fan Circuit Fantrol Stage Fans On 1 1 2 1...

Страница 47: ...The Stage Down Error Step is added to Stage Down Accumulator once every Stage Down Error Delay seconds When the Stage Down Error Accumulator is greater than the Stage Down Error Setpoint another stag...

Страница 48: ...egrees F as discharge superheat changes from 30 to 22 degrees F A PID logic will be used to control the superheat to the target value When the EXV transitions to the superheat control state the target...

Страница 49: ...shows the EXV range for each size compressor at minimum and maximum capacity The minimum and maximum values vary linearly with slide position defining a new EXV control range for every change in slid...

Страница 50: ...uit is operating Any time the compressor starter output is on the status enable output will be on for that compressor Economizer Control The economizer is activated when the circuit state is Run and t...

Страница 51: ...AS clear alarm signal If active via trigger condition 1 above When the alarm occurs due to this trigger it can auto reset the first two times each day with the third occurrence being manual reset For...

Страница 52: ...description as shown on screen EWT Sensor Fail Trigger Sensor shorted or open Action Taken Return water reset cannot be used Reset Auto reset when sensor is back in range Circuit Stop Alarms All circ...

Страница 53: ...psi Evaporator Pressure Switch Fault Alarm description as shown on screen Mech Low Pressure Sw N Trigger Mechanical Low Pressure switch input is low and Remote Evap setpoint Yes Action Taken Rapid sto...

Страница 54: ...the Unit Controller keypad Low OAT Restart Fault Alarm description as shown on screen LowOATRestart Fail N Trigger Circuit has failed three low OAT start attempts Action Taken Rapid stop circuit Rese...

Страница 55: ...but only if the sensor is back in range Oil Pressure Sensor Fault Alarm description as shown on screen OilPressSensFault N Trigger Sensor shorted or open Action Taken Rapid stop circuit Reset This ala...

Страница 56: ...set if the unit mode is switched to Ice or the compressor state is no longer Run Low Evaporator Pressure Unload Event description as shown on screen EvapPressLowUnload N Trigger The low pressure event...

Страница 57: ...e alarm type date and time are stored in the active alarm buffer corresponding to that alarm viewed on the Alarm Active screens also in the alarm history buffer viewed on the Alarm Log screens The act...

Страница 58: ...following table LEFT Default D RIGHT Cancel C UP Increment DOWN Decrement These four edit functions are indicated by one character abbreviations on the right side of the display this mode is entered...

Страница 59: ...VIEW CIRCUIT STATUS 9 REFRIGERANT VIEW REFRIGERANT 7 VIEW FANS VIEW FANS 2 COMPRESSOR SPs SET COMPRESSOR SPs 4 EXV SPs SET EXV SPs 2 FAN SPs SET FANS SPs 6 SET SENSOR OFFSETS SET SENSOR OFFSET 3 TEST...

Страница 60: ...e ENTER key 2 Using the ENTER key scroll to the first line in the menu From there the ARROW keys can be used to scroll to different menus Security All setpoints on the controller are protected using p...

Страница 61: ...ost data from each circuit in addition to unit data Setpoints that apply to the unit or to all circuits including circuit 3 can be changed on this controller Various menus are shown in the controller...

Страница 62: ...VIEW CIR 3 STATUS 1 VIEW REFRG CIR 1 1 VIEW REFRG CIR 2 1 VIEW REFRG CIR 3 1 VIEW FANS CIR 1 1 VIEW UNIT TEMP 2 VIEW CIR 1 STATUS 2 VIEW CIR 2 STATUS 2 VIEW CIR 3 STATUS 2 VIEW FANS CIR 1 2 VIEW UNIT...

Страница 63: ...Definitions This section contains a description of each menu s content The menus are arranged by column per the matrix on page 61 View Menus View menus are used only for viewing the status or setting...

Страница 64: ...X Demand Limit XXX X Network Limit XXX X Values are in percent VIEW UNIT STATUS 3 Unit Capacity XXX X Ice Delay XXh XXm Unit capacity is based on slide valve s position Ice delay will be visible only...

Страница 65: ...NIT TEMP 1 Evap LWT XXX X o F Evap EWT XXX X o F Active SP XXX X o F VIEW UNIT TEMP 2 LWT Pulldn 0 0 o F m Evap Delta T XX X OAT XXX X o F View Circuit Status In the following VIEW CIR screens the N f...

Страница 66: ...Temp XXX X F Disc Temp XXX X F VIEW REFRG CIR N 4 Suct SH XXX X F Disc SH XXX X F VIEW REFRG CIR N 5 Evap Approach XX X F Cond Approach XX X F Oil Delta P XX X psi VIEW REFRG CIR N 6 MaxCondSatT XXX X...

Страница 67: ...meters at the time of the alarm are shown on the bottom line of the screen one at a time They are listed below They are scrolled through by pressing the edit key and using the up and down arrows to sc...

Страница 68: ...ne is a reminder that the unit must be shut off to change modes SET UNIT SPs 3 Cool LWT XX X F Ice LWT XX X F StartDelta XX X F SET UNIT SPs 4 StopDelta X X F Stg Up Delta X X F Stg Down Delta X X F S...

Страница 69: ...have an internal PVM capability If NONE SSS is not selected for solid state starter units the unit will not operate SET UNIT SPs 10 Remote Evap No SET UNIT SPs 11 Sensor Offset Evap LWT X X F Evap EWT...

Страница 70: ...a circuit for standby this setting could limit the number of compressors that would run during a warm startup SET COMP SPs GBL 2 Start Start XXmin Stop Start XXmin SET COMP SPs GBL 3 Pumpdown Pressure...

Страница 71: ...an Setpoints In the following SET CIRN FAN SPs screens the N field indicates which circuit is being viewed SET CIRN FAN SPs 1 Number of fans X Fan VFD ON SET CIRN FAN SPs 2 Stg On Deadband F 1 2 3 4 5...

Страница 72: ...ilDelay XXX sec HighOilDpDel XXX sec SET ALARM LIMITS 3 High Disc Temp XXX F HighLift Delay XXsec SET ALARM LIMITS 4 Evap Freeze XX X F Evap Flow Proof XXXs LowOATStartTmr XXsec Screen Definitions TES...

Страница 73: ...menu pane on the right as shown below SET UNIT SPs X D data C data data Additional fields can be edited by pressing the ENTER key until the desired field is selected When the last field is selected pr...

Страница 74: ...ech II controller to be sure it is set at the desired chilled water temperature 4 Start the auxiliary equipment for the installation by turning on the time clock and or remote on off switch and chille...

Страница 75: ...sition move pumpdown switches Q1 and Q2 to the auto position 4 Observe the unit operation until the system has stabilized Extended Seasonal Shutdown 1 Move the Q1 and Q2 and Q3 switches to the manual...

Страница 76: ...ly as well as the liquid line shutoff valves compressor discharge valves 7 Vent the air from the evaporator water side as well as from the system piping Open all water flow valves and start the chille...

Страница 77: ...g ambient temperature with optional low ambient control 0 F 18 C Leaving chilled water temperature 40 F to 60 F 4 4 C to 15 6 C Leaving chilled fluid temperatures with anti freeze 30 F to 60 F 2 C to...

Страница 78: ...78 OM AGSD 1 Field Wiring Diagram Figure 12 Typical Field Wiring Diagram Updated JUL07 Supersedes all previous versions...

Страница 79: ...OM AGSD 1 79 FIELD WIRING DIAGRAM continued...

Страница 80: ...80 OM AGSD 1 FIELD WIRING DIAGRAM continued...

Страница 81: ...OM AGSD 1 81...

Страница 82: ...unton Virginia 24402 USA 800 432 1342 www mcquay com OM AGS D 07 07 This document contains the most current product information as of this printing For the most up to date product information please g...

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