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McQuay ACZ 010A Скачать руководство пользователя страница 30

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ACZ 010A through 039A

IOMM ACZ1

Compressor Lead/ Lag

The compressor designated as the lead will be the first to start and the last to shut off. Lead/lag
designation is switched based on the number of starts. After 10 starts on Compressor #1 as lead,
Compressor #2 starts as Lead for 10 starts, and then the cycle is repeated.

Capacity Overrides

The following conditions will override the capacity control when the unit is in the COOL mode.

Low Evaporator Pressure

If the unit is running at stage 1 and the evaporator pressure drops below the Low Evaporator
Pressure-Hold setpoint, the unit will hold at stage 1. This condition will inhibit the unit from loading
until the evaporator pressure reaches the hold setpoint plus 8-psi.

If the unit is running at stage 2 and the evaporator pressure drops below the Low Evaporator
Pressure-Unload setpoint, the unit will unload to stage 1. This condition will inhibit the unit from
loading until the evaporator pressure reaches the hold setpoint plus 10 psi.

Discharge Pressure Stage Down

If the unit is running at stage 2 and the condenser pressure rises above the High Condenser Pressure
Stage Down setpoint, the unit will unload to stage 1. This condition will inhibit the unit from loading
until the condenser pressure drops below the unload setpoint less 100 psi.

Digital Output Control

Each digital output is controlled according to the following rules and in accordance with whether the
unit is in normal operation or TEST (test mode). All outputs are initialized to OFF at power on.

Alarm –

(Terminals J12 – NO1)

This output is turned ON when any “EQUIPMENT PROTECTION ALARMS” occur. It is turned
OFF when all alarms have been cleared.

Liquid Line Solenoid –

(Terminals J12 – NO3)

This output is ON when the Compressors are ON. It is OFF for all other cases.

Motor Control Relay #1, #2

– (Terminals J13 – NO4, J13 – NO5)

This output is ON when the Compressors are ON. It is OFF for all other cases.

Fan #1, #2, & #3

– (Terminals J13 – NO6, J14 – NO7, J15 – NO8)

Condenser Fans Staging is based on Condenser pressure as selected Fan Stage On & Off setpoints.

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Содержание ACZ 010A

Страница 1: ...Operation and Maintenance Manual IOMM ACZ1 Group Chiller Part Number 330262002 Effective December 2001 Supersedes New Air Cooled Scroll Condensing Units ACZ 010A ACZ 039A 10 to 43 Tons 35 to 150 kW R...

Страница 2: ...23 Lubrication 23 Electrical Terminals 23 Condensers 23 Refrigerant Sightglass 23 Standard MicroTech II Controller 24 Table of Contents 24 Overview 25 General Description 25 Using the Controller 31 Se...

Страница 3: ...ms carefully against the bill of lading Inspect all units for damage upon arrival Report shipping damage and file a claim with the carrier Check the unit nameplate before unloading to be sure it agree...

Страница 4: ...1 2 13 mm over its length and width The foundation must support the operating weights listed in the Physical Data Tables on pages 15 and 16 Since its operation is affected by wind the unit should be l...

Страница 5: ...ound reduction is necessary locate the unit away from sound sensitive areas Avoid locations beneath windows or between structures where normal operating sounds may be objectionable Reduce structurally...

Страница 6: ...A 039A Rubber in Shear 021639701 2 350014857 LB RB RP 3 Red 010A 020A Spring Isolators 047792726 4 350014835 All CP 1 26 047792726 2 LF RF CP 1 27 025A 039A Spring Isolators 047792727 2 350014839 LB R...

Страница 7: ...on pressure will be lower cooling performance less and water side pressure drop greater If the percentage of glycol is high or if propylene is used instead of ethylene glycol the added pressure drop a...

Страница 8: ...minimum flow rates are required to close the switch and are listed in Table 2 Install the switch as shown in Figure 5 Connect the normally open contacts of the flow switch in the unit control center a...

Страница 9: ...for the available cooling load In short extreme care should be exercised to assure that both piping and controls are suitable for the application such that displaced oil is returned to the compressor...

Страница 10: ...n line size based upon total equivalent length and maximum tons verify the line size selected will maintain entrainment of the lubricating oil up any vertical risers at the minimum tons for the circui...

Страница 11: ...liquid line to the condenser because of the relative location of components In the event 2 or 3 above are possible the application should include a check valve at the condenser end of the liquid line...

Страница 12: ...osses will include values for line friction equivalents for valves and elbows and pressure losses from manufacturers catalogs for driers solenoids sight glasses etc When calculating condenser subcooli...

Страница 13: ...temperature of 75 C Check for proper phasing using a phase sequence meter 7 Verify all mechanical and electrical inspections have been completed according to local codes 8 Open control stop switch S1...

Страница 14: ...he following alarms will limit unit operation Condenser pressure stage down unloads unit at high discharge pressures Low ambient lockout shuts off unit at low ambient temperatures Low evaporator press...

Страница 15: ...Oil Charge Per Compressor Oz g 57 1616 60 1701 140 3969 140 3969 CAPACITY REDUCTION STEPS PERCENT OF COMPRESSOR DISPLACEMENT Standard Staging 0 50 100 0 50 100 0 50 100 0 50 100 CONDENSERS HIGH EFFIC...

Страница 16: ...arge Per Compressor Oz g 140 3969 140 3969 140 3969 296 8392 CAPACITY REDUCTION STEPS PERCENT OF COMPRESSOR DISPLACEMENT Standard Staging 0 45 100 0 50 100 0 50 100 0 50 100 CONDENSERS HIGH EFFICIENCY...

Страница 17: ...50 230 42 3 8 1 1 00 25 50 50 460 22 3 10 1 1 00 25 25 25 010A 575 60 18 3 10 1 1 00 25 20 20 208 54 3 6 1 1 00 25 60 70 230 54 3 6 1 1 00 25 60 70 460 26 3 10 1 1 00 25 30 30 013A 575 60 23 3 10 1 1...

Страница 18: ...189 460 12 5 12 5 2 8 2 10 7 99 99 016A 575 60 9 1 9 1 3 0 2 11 5 74 74 208 29 9 29 9 5 8 2 23 7 232 232 230 29 9 29 9 5 8 2 21 4 232 232 460 15 3 15 3 2 8 2 10 7 125 125 020A 575 60 11 6 11 6 3 0 2 1...

Страница 19: ...175 14 GA 2 0 45 14 GA 4 GA 016A 575 60 175 14 GA 2 0 63 14 GA 1 GA 208 175 14 GA 2 0 175 6GA 300 kcmil 230 175 14 GA 2 0 175 6GA 300 kcmil 460 175 14 GA 2 0 45 14 GA 4 GA 020A 575 60 175 14 GA 2 0 63...

Страница 20: ...r Power Supply Field Wire Size 7 Recommended Fuse Sizes are selected at approximately 150 to 175 of the largest compressor RLA plus 100 of all other loads in the circuit 8 Maximum Fuse Sizes are selec...

Страница 21: ...ON TIME CLOCK REMOTE STOP BY OTHERS 2 CONTROL CIRCUIT FUSE 120 VAC TB1 20 25 843 35 IF REMOTE STOP CONTROL IS USED REMOVE LEAD 843 26 36 FROM TERM 25 TO 35 FUSED CONTROL CIRCUIT TRANSFORMER BY OTHERS...

Страница 22: ...8 28 6 5 8 15 8 28 711 2 22 558 8 23 584 2 016A 020A 7 8 22 2 1 5 8 41 3 5 8 15 8 25 635 0 21 553 4 23 584 2 Figure 9 ACZ 025A through 039A CONTROL ELECTRICAL KNOCKOUT 21 32 541 53 46 19 1173 23 49 0...

Страница 23: ...of dirt and debris from the outside surface of the fins Use locally purchased foaming condenser coil cleaners for periodic cleaning of the coil Condenser cleaners may contain harmful chemicals Wear p...

Страница 24: ...ol 25 Inputs Outputs 26 Setpoints 26 Equipment Protection Alarms 27 Limit Alarms 28 Unit Enable 28 Unit Mode Selection 29 Low Ambient Start 29 Automatic Adjusted Range Limits 29 Compressor Staging Par...

Страница 25: ...omatic and switched every ten starts General Description NOTE When the following descriptions refer to evaporator pressure the pressure is actually the suction pressure within the condensing unit itse...

Страница 26: ...8 Stage 2 Request 0 VAC Stop 24 VAC Start Digital Outputs Description Load Output OFF Output ON 1 Alarm Alarm Indicator Alarm OFF Alarm ON 3 Liquid Line Solenoid Cooling OFF Cooling ON 4 Motor Control...

Страница 27: ...psi 31 to 65 psi M Low Evap Pressure Unload 59 psi 31 to 65 psi M High Condenser Stage Down 370 psi 365 to 375 psi M High Condenser Pressure 380 psi 380 to 390 psi M Low Ambient Lockout 35 0 F 2 to 60...

Страница 28: ...earing based on reaching the conditions in the reset column Table 12 Limit Alarms Description Occurs When Action Taken Reset Condenser Pressure Stage Down Pressure High Condenser Stage Down setpoint S...

Страница 29: ...ssor If the Evap Press is 0 48 times the Low Evap Press SP take Action or else continue Rapid Stop See Low Ambient Re Start below Check 2 After 15 Seconds after Check 1 If the Evap Press is 0 66 times...

Страница 30: ...ing until the evaporator pressure reaches the hold setpoint plus 10 psi Discharge Pressure Stage Down If the unit is running at stage 2 and the condenser pressure rises above the High Condenser Pressu...

Страница 31: ...Navigating Through the Menus The menus are arranged in a matrix of screens across a top horizontal row Some of these top level screens have sub screens located under them The general content of each...

Страница 32: ...shown in the controller display Each menu screen shows specific information in some cases menus are used only to view the status of the unit in some cases they are used for checking and clearing alarm...

Страница 33: ...0 2 Press SET the UP Key to go to the setpoint menus 3 Press SET FAN SP the Right key to go to setpoints associated with unit operation 4 Since the first or top menu will be used there is no need to p...

Страница 34: ...T ALARMS 4 PHASE VOLT LOW AMB LOCKOUT SET UNIT SPs 5 PROTOCOL SET LIMIT ALARMS 5 LOW EVAP PR SET UNIT SPs 6 EVAP OFFSET SET UNIT SPs 7 COND OFFSET SET UNIT SPs 8 AMBIENT OFFSET SET UNIT SPs 9 ENTER PA...

Страница 35: ...a screen will show VIEW REFRIG PSI F SAT EVAP XXX X XX X SAT COND XXX X XX X The ARROW keys will automatically return to the scroll mode at this time Screen Definitions VIEW This section contains info...

Страница 36: ...Outside Amb XX X F VIEW COMPRESSORS VIEW COMP 1 State OFF LEAD Hours XXXXX Starts XXXXX VIEW COMP 2 State OFF LAG Hours XXXXX Starts XXXXX VIEW REFRIGERANT VIEW REFRIG 1 psi F SAT EVAP XXX X XX X SAT...

Страница 37: ...25 alarms either shutdown or limit are shown in this menu with subsequent menus stored under it ARROW DOWN from this menu will go to the next to last alarm ARROW DOWN again will go to the second from...

Страница 38: ...WORK used with BAS signal which is wired to the three communication ports SET UNIT SPs 2 Available Modes COOL Set w FP Switch Off Available Modes setting is the standard COOL or TEST as selected from...

Страница 39: ...s of access to changeable parameters The passwords are preprogrammed into the controller The Operator Password is 0100 Either password must be entered using the ENTER PASSWORD 12 screen before a prote...

Страница 40: ...nning when the LowEvPrStop setting is reached default is 58 psi SET ALARM LMTS 2 Evap Freeze XX X F LowEvpPrDelay XXs EvapFlowProof XXXsec Evap Freeze the unit freeze protection shutdown is actually a...

Страница 41: ...t used 2 should be used for Models ACZ 010 013 and 017 and 3 should be used for ACZ 020 025 029 and 039 SpeedTrol tells the controller whether the optional SpeedTrol is installed in the unit The UP AR...

Страница 42: ...s by maintaining a constant superheat Superheat is the difference between refrigerant temperature as it leaves the evaporator and the saturation temperature corresponding to the evaporator pressure Ty...

Страница 43: ...constructed Hot Gas Bypass Hot gas bypass is a system for maintaining evaporator pressure at or above a minimum value The purpose for doing this is to keep the velocity of the refrigerant as it passes...

Страница 44: ...f refrigerant that will condense in the hot gas line during periods when hot gas bypass is not required Figure 13 Hot Gas Bypass Piping Discharge Line Hot Gas Bypass Valve Hot Gas Bypass Solenoid Valv...

Страница 45: ...circuit 4 Clean coil 5 Adjust FanTrol setting LOW DISCHARGE PRESSURE 1 Faulty condenser control 2 Low refrigerant charge 3 Low suction pressure 1 Check condenser control operation 2 Check for leaks Ad...

Страница 46: ...46 ACZ 010A through 039A IOMM ACZ1...

Страница 47: ......

Страница 48: ...Post Office Box 2510 Staunton Virginia 24402 USA 540 248 0711 www mcquay com...

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