Carrier MPW015-045 User Manual

30MPA,MPW015-045

Liquid Chillers with Scroll Compressors

and ComfortLink™ Controls

Controls, Start-Up, Operation,

Service, and Troubleshooting

AQUASNAP

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be hazardous due to system pressures, electrical components, and equipment location (elevated structures, mechanical rooms, etc.). Only trained, qualified installers and service mechanics should install, start up, and service this equipment.

When working on this equipment, observe precautions in the literature, and on tags, stickers, and labels attached to the equipment, and any other safety precautions that apply. Follow all safety codes. Wear safety glasses and work gloves. Use care in handling, rigging, and setting this equipment, and in handling all electrical components.

WARNING

Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation. There may be more than one disconnect switch. Tag all disconnect locations to alert others not to restore power until work is completed.

WARNING

DO NOT VENT refrigerant relief valves within a building. Outlet from relief valves must be vented outdoors in accordance with the latest edition of ANSI/ASHRAE (American National Standards Institute/American Society of Heating, Refrigerating and Air Conditioning Engineers) 15 (Safety Code for Mechanical Refrigeration). The accumulation of refrigerant in an enclosed space can displace oxygen and cause asphyxiation. Provide adequate ventilation in enclosed or low overhead areas. Inhalation of high concentrations of vapor is harmful and may cause heart irregularities, unconsciousness or death. Misuse can be fatal. Vapor is heavier than air and reduces the amount of oxygen available for breathing. Product causes eye and skin irritation. Decomposition products are hazardous.

CAUTION

This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the electronic modules or electrical components.

CAUTION

To prevent potential damage to heat exchanger, always run fluid through heat exchanger when adding or removing refrigerant charge. Use appropriate brine solutions in cooler fluid loop to prevent the freezing of brazed plate heat exchanger when the equipment is exposed to temperatures below 32 F (0° C). Proof of flow switch is factory installed on all models. Do NOT remove power from this chiller during winter shutdown periods without taking precaution to remove all water from heat exchanger and optional hydronic system. Failure to properly protect the system from freezing may constitute abuse and may void warranty.

CAUTION

Compressors require specific rotation. Monitor control alarms during first compressor start up for reverse rotation protection. Damage to unit may result.

CAUTION

Refrigerant charge must be removed slowly to prevent loss of compressor oil that could result in compressor failure.

CAUTION

WARNING

DO NOT attempt to unbraze factory joints when servicing this equipment. Compressor oil is flammable and there is no way to detect how much oil may be in any of the refrigerant lines. Cut lines with a tubing cutter as required when performing service. Use a pan to catch any oil that may come out of the lines and as a gage for how much oil to add to system. DO NOT re-use compressor oil. Damage to equipment or personal injury may result.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53300053-01 Printed in U.S.A. Form 30MP-1T Pg 1 1-10 Replaces: New

Puron® refrigerant (R-410A) systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment. If service equipment is not rated for Puron refrigerant, equipment damage or personal injury may result.

ENTER

CONTENTS

Page

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Conventions Used in this Manual . . . . . . . . . . . . . . . . . . . 2

Basic Controls Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-33

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Main Base Board (MBB). . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Energy Management Module (EMM). . . . . . . . . . . . . . . . 14

Current Sensor Board (CSB) . . . . . . . . . . . . . . . . . . . . . . . 14

Enable/Off/Remote Contact Switch. . . . . . . . . . . . . . . . . 14

Emergency On/Off Switch. . . . . . . . . . . . . . . . . . . . . . . . . . 14

Board Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Control Module Communication . . . . . . . . . . . . . . . . . . . 14

Carrier Comfort Network

Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

• COOLER LEAVING FLUID SENSOR

• COOLER ENTERING FLUID SENSOR

• CONDENSER LEAVING FLUID SENSOR

• CONDENSER ENTERING FLUID SENSOR

• COMPRESSOR RETURN GAS TEMPERATURE SENSOR

• OUTDOOR-AIR TEMPERATURE SENSOR

• DUAL LEAVING WATER TEMPERATURE SENSOR

• REMOTE SPACE TEMPERATURE SENSOR

Energy Management Module. . . . . . . . . . . . . . . . . . . . . . . 21

Loss-of-Cooler Flow Protection . . . . . . . . . . . . . . . . . . . . 21

Condenser Flow Protection . . . . . . . . . . . . . . . . . . . . . . . . 21

Thermostatic Expansion Valves (TXV) . . . . . . . . . . . . . 21

Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

• MINUTES LEFT FOR START

• MINUTES OFF TIME

• LEAD/LAG DETERMINATION

• CAPACITY CONTROL OVERRIDES

Operation of Machine Based on Control Method

and Cooling Set Point Selection Settings . . . . . . . . 24

Cooling Set Point Select . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Cooler Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Ice Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Service Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Cooler Pump Sequence of Operation . . . . . . . . . . . . . . 25

Condenser Pump/Condenser Fan Output

Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Configuring and Operating Dual Chiller Control. . . . 25

Temperature Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

• DEMAND LIMIT (2-Stage Switch Controlled)

• EXTERNALLY POWERED DEMAND LIMIT

(4 to 20 mA Controlled)

• DEMAND LIMIT (CCN Loadshed Controlled)

Cooling Set Point (4 to 20 mA) . . . . . . . . . . . . . . . . . . . . . 32

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33,34

System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

START-UP AND OPERATION . . . . . . . . . . . . . . . . . . . . 34-36

Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Check Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . 34

Operating Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

• TEMPERATURES

• VOLTAGE — ALL UNITS

OPERATION SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . 36

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-44

Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

• CONTROL COMPONENTS

Compressor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 36

30MPW Condenser and 30MP Cooler . . . . . . . . . . . . . . 36

• BRAZED-PLATE COOLER AND CONDENSER

HEAT EXCHANGER REPLACEMENT

• BRAZED-PLATE COOLER AND CONDENSER

HEAT EXCHANGER CLEANING

Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Check Refrigerant Feed Components . . . . . . . . . . . . . . 37

• FILTER DRIER

• MOISTURE-LIQUID INDICATOR

• THERMOSTATIC EXPANSION VALVE (TXV)

Interface . . . . . . . . . . . . . . . . 14

• MINIMUM LOAD VALVE

• PRESSURE RELIEF DEVICES

Check Unit Safeties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Thermistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Pressure Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Chilled Water Flow Switch . . . . . . . . . . . . . . . . . . . . . . . . . 39

Strainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Replacing Defective Modules. . . . . . . . . . . . . . . . . . . . 43

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44,45

Recommended Maintenance Schedule . . . . . . . . . . . . 44

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .44-52

Complete Unit Stoppage and Restart . . . . . . . . . . . . . . 44

• GENERAL POWER FAILURE

• UNIT ENABLE-OFF-REMOTE CONTACT SWITCH IS OFF

• CHILLED FLUID PROOF-OF-FLOW SWITCH OPEN

• OPEN 24-V CONTROL CIRCUIT BREAKERS

• COOLING LOAD SATISFIED

• THERMISTOR FAILURE

• LOW SATURATED SUCTION

• COMPRESSOR SAFETIES

Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

APPENDIX A — LOCAL DISPLAY TABLES . . . . . . .53-64

APPENDIX B — CCN TABLES. . . . . . . . . . . . . . . . . . . .65-72

START-UP CHECKLIST FOR 30MP LIQUID

CHILLER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1 to CL-8

GENERAL

This publication contains Start-Up, Service, Controls, Oper-

ation, and Troubleshooting information for the 30MPW watercooled chillers and the 30MPA air-cooled chillers. See Table 1. These liquid chillers are equipped with ComfortLink controls and conventional thermostatic expansion valves (TXVs). The 30MPA units and the 30MPW units with optional medium temperature brine are also equipped with liquid line solenoid valves (LLSVs).

CAUTION

This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short out or bypass components or otherwise depart from recommended procedures. Any short-to-ground of the control board or accompanying wiring may destroy the board or electrical component.

Table 1 — Unit Sizes

UNIT MODEL NOMINAL TONS 30MPA,MPW015 15 30MPA,MPW020 20 30MPA,MPW030 30 30MPA,MPW040 40 30MPA,MPW045 45

Conventions Used in This Manual — The follow-

ing conventions for discussing configuration points for the local display (scrolling marquee or Navigator™ accessory) will be used in this manual.

Point names will be written with the mode name first, then any sub-modes, then the point name, each separated by an arrow symbol (. Names will also be shown in bold and italics. As an example, the Minimum Load Valve Select Point, which is located in the Configuration mode, Option 1 sub-mode, would be written as ConfigurationOPT1 MLV.S.

This path name will show the user how to navigate through the local display to reach the desired configuration. The user would scroll through the modes and sub-modes using the

and keys. The arrow symbol in the path name represents pressing to move into the next level of the menu structure.

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

Run Status

Service Test

Temperature

Pressures

Setpoints

Inputs

Outputs

Configuration

Time Clock

Operating Modes

Alarms

Alarm Status

ENTER

MODE

ESCAPE

Fig. 1 — Scrolling Marquee Display

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

When a value is included as part of the path name, it will be shown at the end of the path name after an equals sign. If the value represents a configuration setting, an explanation will be shown in parenthesis after the value. As an example, ConfigurationOPT1MLV.S = 1 (Minimum Load Valve Select).

Pressing the and keys simultaneously will scroll an expanded text description of the point name or value across the display. The expanded description is shown in the local display tables but will not be shown with the path names in text.

The CCN (Carrier Comfort Network

) point names are also referenced in the local display tables for users configuring the unit with CCN software instead of the local display. The CCN tables are located in Appendix B of the manual.

Basic Control Usage

SCROLLING MARQUEE DISPLAY — The scrolling marquee display is the standard interface display to the ComfortLink Control System for 30MP units. The display has up and down arrow keys, an key, and an key. These keys are used to navigate through the different levels of the display structure. Press the key until the highest operating level is displayed to move through the top 11 mode levels indicated by LEDs (light emitting diodes) on the left side of the display. See Fig. 1 and Tables 2-14.

Once within a mode or sub-mode, pressing the and keys simultaneously will put the scrolling marquee display into expanded text mode where the full meaning of all sub-modes, items and their values can be displayed for the current selection. Press the and keys to return the scrolling marquee display to its default menu of rotating display items (those items in Run Status In addition, the password will be disabled, requiring that it be entered again before changes can be made to password protected items. Press the key to exit out of the expanded text mode.

NOTE: When the Language Selection (Configuration DISPLANG), variable is changed, all appropriate display expansions will immediately change to the new language. No power-off or control reset is required when reconfiguring languages.

When a specific item is located, the item name alternates with the value. Press the key at a changeable item and the value will be displayed. Press again and the value will begin to flash indicating that the value can be changed. Use the up and down arrow keys to change the value, and confirm the value by pressing the key.



VIEW).



Changing item values or testing outputs is accomplished in

the same manner. Locate and display the desired item. Press

so that the item value flashes. Use the arrow keys to change the value or state and press the key to accept it. Press the key to return to the next higher level of structure. Repeat the process as required for other items.

Items in the Configuration and Service Test modes are password protected. The words ‘PASS’ and ‘WORD’ will alternate on the display when required. The default password is 0111. Press and the 1111 password will be displayed. Press

again and the first digit will begin to flash. Use the arrow keys to change the number and press to accept the digit. Continue with the remaining digits of the password. The password can only be changed through CCN operator interface software such as ComfortWORKS

, ComfortVIEW™

and Service Tool.

See Tables 2-14 and Appendix A for further details.

ACCESSORY NAVIGATOR™ DISPLAY MODULE — The Navigator module provides a mobile user interface to the

ComfortLink™ control system, which is only available as a field-installed accessory. The display has up and down arrow keys, an key, and an key. These keys are used to navigate through the different levels of the display structure. Press the key until ‘Select a Menu Item’ is displayed to move through the top 11 mode levels indicated by LEDs on the left side of the display. See Fig. 2.

Once within a Mode or sub-mode, a “>” indicates the cur-

rently selected item on the display screen. Pressing the

and keys simultaneously will put the Navigator module into expanded text mode where the full meaning of all sub-modes, items and their values can be displayed. Pressing the and keys when the display says ‘Select Menu Item’ (Mode LED level) will return the Navigator module to its default menu of rotating display items (those items in Run Status



VIEW). In addition, the password will be disabled, requiring that it be entered again before changes can be made to password protected items. Press the key to exit out of the expanded text mode.

When a specific item is located, the item name appears on the left of the display, the value will appear near the middle of the display and the units (if any) will appear on the far right of the display. Press the key at a changeable item and the value will begin to flash. Use the up and down arrow keys to change the value, and confirm the value by pressing the key.

Changing item values or testing outputs is accomplished in the same manner. Locate and display the desired item. Press

Items in the Configuration and Service Test modes are password protected. The words Enter Password will be displayed when required, with 1111 also being displayed. The default password is 1111. Use the arrow keys to change the number



and press to enter the digit. Continue with the re-

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

Fig. 2 — Accessory Navigator™ Display Module

maining digits of the password. The password can only be changed through CCN operator interface software such as ComfortWORKS, ComfortVIEW and Service Tool.

Adjusting the Contrast

— The contrast of the display can be adjusted to suit ambient conditions. To adjust the contrast of the Navigator module, press the key until the display reads, “Select a menu item.” Using the arrow keys move to the Configuration mode. Press to obtain access to this mode. The display will read:

> TEST OFF METR OFF LANG ENGLISH

Pressing will cause the “OFF” to flash. Use the up or down arrow to change “OFF” to “ON”. Pressing will illuminate all LEDs and display all pixels in the view screen. Pressing and simultaneously allows the user to adjust the display contrast. Use the up or down arrows to adjust the contrast. The screen’s contrast will change with the adjustment. Press to accept the change. The Navigator module will keep this setting as long as it is plugged in to the LEN bus.

Adjusting the Backlight Brightness

— The backlight of the display can be adjusted to suit ambient conditions. The factory default is set to the highest level. To adjust the backlight of the Navigator module, press the key until the display reads, “Select a menu item.” Using the arrow keys move to the

Table 2 — Scrolling Marquee Display Menu Structure*

MODE

SUB-MODE

LEGEND Ckt — Circuit *Throughout this text, the location of items in the menu structure will be

described in the following format: Item Expansion (Mode Name

RUN

STATUS

Auto

View of

Run Status

(VIEW)

Unit Run

Hour and

Start

(RUN)

Circuit and

Compressor

Run Hours

(HOUR)

Compressor

Starts

(STRT)

Preventive

Maintenance

(PM)

Software

Ver si on (VERS)

SERVICE

TEST

Service

Te s t M o d e

(TEST)

Outputs

and Pumps

(OUTS)

Ciruit A Comp

Te st

(CMPA)



TEMPERATURES PRESSURES

Unit Temperatures

Temperatures

Sub-mode NameITEM)

(UNIT)

Circuit A

(CIR.A)

Pressures

Circuit A (PRC.A)

SET

POINTS

Cooling

Setpoints

(COOL)

Head

Pressure

Setpoint

(HEAD)

Brine

Free ze

Setpoint

(FRZ)

Configuration mode. Press to obtain access to this mode. The display will read:

> TEST OFF METR OFF LANG ENGLISH

Pressing will cause the “OFF” to flash. Use the up

or down arrow keys to change “OFF” to “ON”. Pressing

will illuminate all LEDs and display all pixels in the view screen. Pressing the up and down arrow keys simultaneously allows the user to adjust the display brightness. Use the up or down arrow keys to adjust screen brightness. Press

to accept the change. The Navigator module will keep this setting as long as it is plugged in to the LEN bus.

Comfort

Link

MODE

Alarm Status

Run S

tatus

Service Test

Temperatures

ressures

Setpoints

Inputs

Outputs

Configuration

Time Clock

ESC

Operating Modes

Alarm

ENTER

INPUTS OUTPUTS CONFIGURATION

General

Inputs

(GEN.I)

Circuit Inputs

(CRCT)

4-20mA

Inputs (4-20)

General Outputs

(GEN.O)

Outputs

Circuit A

(CIR.A)

For example, using the language selection item: Language Selection (Configuration

Display

Configuration

(DISP)

Unit

Configuration

(UNIT)

Unit Options 1

Hardware

(OPT1)

Unit Options 2

Controls

(OPT2)

CCN Network

Configuration

(CCN)

Reset Cool Temp

(RSET)

Set Point and

Ramp Load

(SLCT) Service

Configuration

(SERV)

Broadcast

Configuration

(BCST)

Date, Day,

Schedules

Schedule



DISPLANG)

TIME

CLOCK

Time of

(TIME)

Month,

and Year

(DATE)

Daylight Savings

Time

(DST)

Local

Holiday

(HOL.L)

Number

(SCH.N)

Local Occupancy

(SCH.L)

Override

(OVR)

Day

OPERATING

MODES

Modes

(MODE)

ALARMS

Current (CRNT)

Reset

Alarms

(RCRN)

Alarm

History

(HIST)

Table 3 — Run Status Mode and Sub-Mode Directory

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY SUB-ITEM DISPLAY SUB-ITEM DISPLAY

VIEW EWT XXX.X F ENTERING FLUID TEMP

LWT XXX.X F LEAVING FLUID TEMP

SETP XXX.X F ACTIVE SETPOINT

CTPT XXX.X F CONTROL POINT

LOD.F XXX LOAD/UNLOAD FACTOR

STAT X CONTROL MODE 0 = Service Test

OCC YES/NO OCCUPIED

MODE YES/NO OVERRIDE MODES IN EFFECT

CAP XXX % PERCENT TOTAL CAPACITY

STGE X REQUESTED STAGE

ALRM XXX CURRENT ALARMS & ALERTS

TIME XX.XX TIME OF DAY 00.00-23.59

MNTH XX MONTH OF YEAR 1 = January, 2 = February, etc.

DATE XX DAY OF MONTH 01- 31

ITEM

EXPANSION

COMMENT

1 = Off Local 2 = Off CCN 3 = Off Time 4 = Off Emrgcy 5 = On Local 6 = On CCN 7 = On Time 8 = Ht Enabled 9 = Pump Delay

YEAR XX YEAR OF CENTURY

RUN HRS.U XXXX HRS MACHINE OPERATING HOURS

STR.U XXXX MACHINE STARTS

HR.P1 XXXX.X PUMP 1 RUN HOURS

HR.P2 XXXX.X PUMP 2 RUN HOURS

HOUR HR.A1 XXXX HRS COMPRESSOR A1 RUN HOURS

HR.A2 XXXX HRS COMPRESSOR A2 RUN HOURS

HR.A3 XXXX HRS COMPRESSOR A3 RUN HOURS

STRT ST.A1 XXXX COMPRESSOR A1 STARTS

ST.A2 XXXX COMPRESSOR A2 STARTS

ST.A3 XXXX COMPRESSOR A3 STARTS

STRN STRAINER MAINTENANCE

SI.ST XXXX HRS STRAINER SRVC INTERVAL

S.T.DN XXXX HRS STRAINER SRVC COUNTDOWN

S.T.MN YES/NO STRAINER MAINT. DONE User Entry

ST.DT STRAINER MAINT. DATES

S.T.M0 MM/DD/YY HH:MM

S.T.M1 MM/DD/YY HH:MM

S.T.M2 MM/DD/YY HH:MM

S.T.M3 MM/DD/YY HH:MM

S.T.M4 MM/DD/YY HH:MM

Table 3 — Run Status Mode and Sub-Mode Directory (cont)

ENTER

ESCAPE

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY SUB-ITEM DISPLAY SUB-ITEM DISPLAY

VERS AUX CESR131333-xx-xx xx-xx is Version number*

MBB CESR131279-xx-xx xx-xx is Version number*

EMM CESR131174-xx-xx xx-xx is Version number*

MARQ CESR131171-xx-xx xx-xx is Version number*

NAVI CESR130227-xx-xx xx-xx is Version number*

*Press and simultaneously to obtain version number.

ITEM

EXPANSION

COMMENT

Table 4 — Service Test Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

TEST ON/OFF SERVICE TEST MODE To Enable Service Test Mode,

OUTS OUTPUTS AND PUMPS

CLR.P ON/OFF COOLER PUMP RELAY

CND.P ON/OFF CONDENSER PUMP

UL.TM 0 to 15 COMP A1 UNLOAD TIME

CC.H ON/OFF CRANKCASE HEATER

CW.VO ON/OFF CONDENSER VALVE OPEN

ITEM

EXPANSION

COMMENT

move Enable/Off/Remote Contact switch to OFF. Change TEST to ON. Move switch to ENABLE.

CW.VC ON/OFF CONDENSER VALVE CLOSE

LL.SV ON/OFF LIQUID LINE SOLENOID

RMT.A ON/OFF REMOTE ALARM RELAY

CMPA CIRCUIT A COMPRESSOR TEST

CC.A1 ON/OFF COMPRESSOR A1 RELAY

UL.TM 0 to 15 COMP A1 UNLOAD TIME

CC.A2 ON/OFF COMPRESSOR A2 RELAY

CC.A3 ON/OFF COMPRESSOR A3 RELAY

MLV ON/OFF MINIMUM LOAD VALVE RELAY

Table 5 — Temperature Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

UNIT ENT AND LEAVE UNIT TEMPS

CEWT XXX.X F COOLER ENTERING FLUID

CLWT XXX.X F COOLER LEAVING FLUID

CDET XXX.X F CONDENSER ENTERING FLUID

CDLT XXX.X F CONDENSER LEAVING FLUID

OAT XXX.X F OUTSIDE AIR TEMPERATURE

SPT XXX.X F SPACE TEMPERATURE

ITEM

EXPANSION

COMMENT

DLWT XXX.X F LEAD/LAG LEAVING FLUID

Table 5 — Temperature Mode and Sub-Mode Directory (cont)

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

CIR.A TEMPERATURES CIRCUIT A

SCT.A XXX.X F SATURATED CONDENSING TMP

SST.A XXX.X F SATURATED SUCTION TEMP

RGT.A XXX.X F COMPR RETURN GAS TEMP

D.G AS XXX.X F DISCHARGE GAS TEMP

SH.A XXX.X ^F SUCTION SUPERHEAT TEMP

ITEM

EXPANSION

Table 6 — Pressure Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

PRC.A PRESSURES CIRCUIT A

DP.A XXX.X PSIG DISCHARGE PRESSURE

SP.A XXX.X PSIG SUCTION PRESSURE

ITEM

EXPANSION

Table 7 — Set Points Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

COOL COOLING SETPOINTS

CSP.1 XXX.X F COOLING SETPOINT 1 Default: 44 F

CSP.2 XXX.X F COOLING SETPOINT 2 Default: 44 F

CSP.3 XXX.X F ICE SETPOINT Default: 32 F

HEAD HEAD PRESSURE SETPOINTS

H.DP XXX.X F HEAD SETPOINT Default: 95 F

FRZ BRINE FREEZE SETPOINT

BR.FZ XXX.X F BRINE FREEZE POINT Default: 34 F

ITEM

EXPANSION

COMMENT

Table 8 — Inputs Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

GEN.I GENERAL INPUTS

STST STRT/STOP START/STOP SWITCH

FLOW ON/OFF COOLER FLOW SWITCH

CD.FL OPEN/CLSE CONDENSER FLOW SWITCH

DLS1 ON/OFF DEMAND LIMIT SWITCH 1

DLS2 ON/OFF DEMAND LIMIT SWITCH 2

ICED ON/OFF ICE DONE

DUAL ON/OFF DUAL SETPOINT SWITCH

CRCT CIRCUITS INPUTS

FKA1 ON/OFF COMPRESSOR A1 FEEDBACK

FKA2 ON/OFF COMPRESSOR A2 FEEDBACK

FKA3 ON/OFF COMPRESSOR A3 FEEDBACK

4-20

DMND XX.X MA 4-20 MA DEMAND SIGNAL

RSET XX.X MA 4-20 MA RESET SIGNAL

CSP XX.X MA 4-20 MA COOLING SETPOINT

ITEM

EXPANSION

4-20 MA INPUTS

COMMENT

Table 9 — Outputs Mode and Sub-Mode Directory

ENTER

SUB-MODE

GEN.O GENERAL OUTPUTS

CIR.A OUTPUTS CIRCUIT A

KEYPAD

ENTRY

ITEM DISPLAY

C.LWP ON/OFF COOLER PUMP RELAY

C.DWP ON/OFF CONDENSER PUMP

ALRM ON/OFF ALARM RELAY

CDWO ON/OFF CONDENSER VALVE OPEN

CDWC ON/OFF CONDENSER VALVE CLOSE

CC.A1 ON/OFF COMPRESSOR A1 RELAY

D.SOL ON/OFF DIGITAL SCROLL SOLENOID

CC.A2 ON/OFF COMPRESSOR A2 RELAY

CC.A3 ON/OFF COMPRESSOR A3 RELAY

CCH ON/OFF CRANKCASE HEATER RELAY

LLSV ON/OFF LIQUID LINE SOLENOID

MLV.R ON/OFF MINIMUM LOAD VALVE RELAY

EXPANSION

Table 10 — Configuration Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

DISP DISPLAY CONFIGURATION

TEST ON/OFF TEST DISPLAY LEDS

METR ON/OFF METRIC DISPLAY

LANG X LANGUAGE SELECTION Default: 0

PAS.E ENBL/DSBL PASSWORD ENABLE Default: Enable

PASS xxxx SERVICE PASSWORD D e fa u lt : 1111

UNIT UNIT CONFIGURATION

TYPE x UNIT TYPE

SIZE XX UNIT SIZE

SZA.1 XX COMPRESSOR A1 SIZE Unit Dependent

SZA.2 XX COMPRESSOR A2 SIZE Unit Dependent

SZA.3 XX COMPRESSOR A3 SIZE Unit Dependent

ITEM

EXPANSION

ITEM

Off = English On = Metric

0 = English 1 = Espanol 2 = Francais 3 = Portuguese

2=WaterCooled 3=Split System

COMMENT

A1.TY No/Yes COMPRESSOR A1 DIGITAL?

MAX.T 0 to 15 MAXIMUM A1 UNLOAD TIME

Default: Yes (A1 Digital Scroll)

Default: 7

Table 10 — Configuration Mode and Sub-Mode Directory (cont)

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

OPT1 UNIT OPTIONS 1 HARDWARE

FLUD X COOLER FLUID

MLV.S YES/NO MINIMUM LOAD VALVE SELECT Default: No

R.G.EN ENBL/DSBL RETURN GAS SENSOR ENABLE

OAT.E ENBL/DSBL ENABLE OAT SENSOR

D.G.EN ENBL/DSBL DISCHARGE GAS TEMP ENABLE

CSB.E ENBL/DSBL CSB BOARDS ENABLE

CPC ON/OFF COOLER PUMP CONTROL Default: On

PM.DY XX MIN COOLER PUMP SHUTDOWN DLY 0 to 10 minutes, Default: 1 min.

DPME x ENABLE CONDENSER PUMP 0 to 2

DFLS ENBL/DSBL ENABLE COND FLOW SWITCH

CDWS ENBL/DSBL ENABLE COND WTR SENSORS

OPT2 UNIT OPTIONS 2 CONTROLS

CTRL X CONTROL METHOD Default: Switch

LCWT XX.X F HIGH LCW ALERT LIMIT

DELY XX MINUTES OFF TIME

ICE.M ENBL/DSBL ICE MODE ENABLE Default: Disable

CCN CCN NETWORK CONFIGURATION

CCNA XXX CCN ADDRESS

CCNB XXX CCN BUS NUMBER

BAUD X CCN BAUD RATE Default: 9600

RSET RESET COOL TEMP

CRST X COOLING RESET TYPE Default: No Reset

MA.DG XX.X F 4-20 - DEGREES RESET

RM.NO XXX.X F REMOTE - NO RESET TEMP

RM.F XXX.X F REMOTE - FULL RESET TEMP

RM.DG XX.X

F REMOTE - DEGREES RESET

RT.NO XXX.X F RETURN - NO RESET TEMP

RT.F XXX.X F RETURN - FULL RESET TEMP

RT.DG XX.X F RETURN - DEGREES RESET

DMDC X DEMAND LIMIT SELECT Default: None

DM20 XXX % DEMAND LIMIT AT 20 MA

SHNM XXX LOADSHED GROUP NUMBER

SHDL XXX % LOADSHED DEMAND DELTA

SHTM XXX MAXIMUM LOADSHED TIME

DLS1 XXX % DEMAND LIMIT SWITCH 1

DLS2 XXX % DEMAND LIMIT SWITCH 2

ITEM

EXPANSION

COMMENT

Default: Water 1 = Water 2 = Medium Temperature Brine

0 = Enable/Off/Remote Switch 2 = Occupancy 3 = CCN Control

Default: 60

Range: 2 to 60 F

Default: 0 Minutes Range: 0 to 15 Minutes

Default: 1 Range: 1 to 239

Default: 0 Range: 0 to 239

1 = 2400 2 = 4800 3 = 9600 4 = 19,200 5 = 38,400

0 = No Reset 1 = 4 to 20 mA Input 2 = Outdoor Air Temperature 3 = Return Fluid 4 = Space Temperature

Default: 0.0F Range: –30 to 30F

Default: 125F (51.7C) Range: 0° to 125F

Default: 0.0F (-17.8C) Range: 0 to 125F

Default: 0.0F Range: –30 to 30F

Default: 10.0F (5.6C) Range: 0 to 125F COOLER T

Default: 0.0F (0.0C) Range: 0 to 125F COOLER T

Default: 0.0F Range: –30 to 30F (–34.4 to -1.1 C)

0 = None 1 = Switch 2 = 4 to 20 mA Input 3 = CCN Loadshed

Default: 100% Range: 0 to 100%

Default: 0 Range: 0 to 99

Default: 0% Range: 0 to 60%

Default: 60 minutes Range: 0 to 120 minutes

Default: 80% Range: 0 to 100%

Default: 50% Range: 0 to 100%

Table 10 — Configuration Mode and Sub-Mode Directory (cont)

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

LLEN ENBL/DSBL LEAD/LAG CHILLER ENABLE Default: Disable

MSSL SLVE/MAST MASTER/SLAVE SELECT Default: Master

SLVA XXX SLAVE ADDRESS

RSET (cont)

LLBL X LEAD/LAG BALANCE SELECT

LLBD XXX LEAD/LAG BALANCE DELTA

LLDY XXX LAG START DELAY

PARA YES PARALLEL CONFIGURATION Default: YES (CANNOT BE CHANGED)

SLCT SETPOINT AND RAMP LOAD

CLSP X COOLING SETPOINT SELECT Default: Single

RL.S ENBL/DSBL RAMP LOAD SELECT Default: Enable

CRMP X.X COOLING RAMP LOADING

SCHD XX SCHEDULE NUMBER

Z.GN X.X DEADBAND MULTIPLIER

SERV SERVICE CONFIGURATION

EN.A1 ENBL/DSBL ENABLE COMPRESSOR A1 Unit dependent

EN.A2 ENBL/DSBL ENABLE COMPRESSOR A2 Unit dependent

EN.A3 ENBL/DSBL ENABLE COMPRESSOR A3 Unit dependent

REV.R ENBL/DSBL REVERSE ROTATION ENABLE Default: Enable

BCST BROADCAST CONFIGURATION

T.D.BC ON/OFF CCN TIME/DATE BROADCAST

OAT.B ON/OFF CCN OAT BROADCAST

G.S.BC ON/OFF GLOBAL SCHEDULE BROADCAST

BC.AK ON/OFF CCN BROADCAST ACK’ER

ITEM

EXPANSION

COMMENT

Default: 0 Range: 0 to 239

Default: Master Leads 0 = Master Leads 1 = Slave Leads 2 = Automatic

Default: 168 hours Range: 40 to 400 hours

Default: 5 minutes Range: 0 to 30 minutes

0 = Single 1 = Dual Switch 2 = Dual CCN Occupied 3 = 4 to 20 mA Input (requires

EMM)

Default: 1.0 Range: 0.2 to 2.0

Default: 1 Range: 1 to 99

Default: 1.0 Range: 1.0 to 4.0

Table 11 — Time Clock Mode and Sub-Mode Directory

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY SUB-ITEM DISPLAY

TIME TIME OF DAY

HH.MM XX.XX HOUR AND MINUTE Military (00:00 – 23:59)

DATE MONTH,DATE,DAY AND YEAR

MNTH XX MONTH OF YEAR 1-12 (1 = January, 2 = February, etc)

DOM XX DAY OF MONTH Range: 01-31

DAY X DAY OF WEEK 1-7 (1 = Monday, 2 = Tuesday, etc)

YEAR XXXX YEAR OF CENTURY

DST DAYLIGHT SAVINGS TIME

STR.M XX MONTH Default: 4, Range 1 – 12

STR.W X WEEK Default: 1, Range 1 – 5

STR.D X DAY Default: 7, Range 1 – 7

MIN.A XX MINUTES TO ADD Default: 60, Range 0 – 99

STP.M XX MONTH Default: 10, Range 1 – 12

STP.W XX WEEK Default: 5, Range 1 – 5

STP.D XX DAY Default: 7, Range 1 – 7

MIN.S XX MINUTES TO SUBTRACT Default: 60, Range 0 – 99

HOL.L LOCAL HOLIDAY SCHEDULES HD.01 through HD.30

MON XX HOLIDAY START MONTH Range 0 – 12

DAY XX START DAY Range 0 – 31

ITEM

EXPANSION

COMMENT

LEN XX DURATION (DAYS) Range 0 - 99

SCH.N XX SCHEDULE NUMBER Default: 1, Range 1 – 99

SCH.L LOCAL OCCUPANCY SCHEDULE

PER.1 OCCUPANCY PERIOD 1*

OCC.1 XX:XX PERIOD OCCUPIED TIME Military (00:00 – 23:59)

UNC.1 XX.XX PERIOD UNOCCUPIED TIME Militar y (00:00 – 23:59)

MON.1 YES/NO MONDAY IN PERIOD

TUE.1 YES/NO TUESDAY IN PERIOD

WED.1 YES/NO WEDNESDAY IN PERIOD

THU.1 YES/NO THURSDAY IN PERIOD

FRI.1 YES/NO FRIDAY IN PERIOD

SAT.1 YES/NO SATURDAY IN PERIOD

SUN.1 YES/NO SUNDAY IN PERIOD

HOL.1 YES/NO HOLIDAY IN PERIOD

OVR SCHEDULE OVERRIDE

OVR.T X TIMED OVERRIDE HOURS Default: 0, Range 0-4 hours

OVR.L X OVERRIDE TIME LIMIT Default: 0, Range 0-4 hours

T.OVR YES/NO TIMED OVERRIDE User Entry

* Repeats for Occupancy Periods 2 through 8.

Table 12 — Operating Mode and Sub-Mode Directory

ENTER

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

MODE MODES CONTROLLING UNIT

MD01 ON/OFF CSM CONTROLLING CHILLER

MD03 ON/OFF MASTER/SLAVE CONTROL

MD05 ON/OFF RAMP LOAD LIMITED

MD06 ON/OFF TIMED OVERRIDE IN EFFECT

MD07 ON/OFF LOW COOLER SUCTION TEMPA

MD09 ON/OFF SLOW CHANGE OVERRIDE

MD10 ON/OFF MINIMUM OFF TIME ACTIVE

MD13 ON/OFF DUAL SETPOINT

MD14 ON/OFF TEMPERATURE RESET

MD15 ON/OFF DEMAND LIMITED

MD16 ON/OFF COOLER FREEZE PROTECTION

MD17 ON/OFF LOW TEMPERATURE COOLING

MD18 ON/OFF HIGH TEMPERATURE COOLING

MD19 ON/OFF MAKING ICE

MD20 ON/OFF STORING ICE

ITEM

EXPANSION

COMMENT

MD21 ON/OFF HIGH SCT CIRCUIT A

MD23 ON/OFF MINIMUM COMP ON TIME

MD24 ON/OFF PUMP OFF DELAY TIME

LEGEND

CSM — Chillervisor System Manager SCT — Saturated Condensing Temperature WSM — Water System Manager

Table 13 — Alarms Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM

CRNT AXXX OR TXXX CURRENTLY ACTIVE ALARMS

RCRN YES/NO RESET ALL CURRENT ALARMS

HIST AXXX OR TXXX ALARM HISTORY

ITEM

EXPANSION

COMMENT

Alarms are shown as AXXX. Alerts are shown as TXXX.

Table 14 — Operating Modes

MODE

NO.

01 CSM CONTROLLING CHILLER Chillervisor System Manager (CSM) is controlling the chiller.

03 MASTER/SLAVE CONTROL Dual Chiller control is enabled.

10 MINIMUM OFF TIME ACTIVE Chiller is being held off by Minutes Off Time (Configuration

ITEM EXPANSION DESCRIPTION

RAMP LOAD LIMITED Ramp load (pull-down) limiting in effect. In this mode, the rate at which leaving fluid temperature

TIMED OVERRIDE IN EFFECT Timed override is in effect. This is a 1 to 4 hour temporary override of the programmed

LOW COOLER SUCTION TEMPA Circuit A cooler Freeze Protection mode. At least one compressor must be on, and the Sat-

SLOW CHANGE OVERRIDE Slow change override is in effect. The leaving fluid temperature is close to and moving

DUAL SETPOINT Dual Set Point mode is in effect. Chiller controls to Cooling Set Point 1 (Set Points

TEMPERATURE RESET Temperature reset is in effect. In this mode, chiller is using temperature reset to adjust leav-

DEMAND LIMITED Demand limit is in effect. This indicates that the capacity of the chiller is being limited by

COOLER FREEZE PROTECTION Cooler fluid temperatures are approaching the Freeze point (see Alarms and Alerts section

LOW TEMPERATURE COOLING Chiller is in Cooling mode and the rate of change of the leaving fluid is negative and

HIGH TEMPERATURE COOLING Chiller is in Cooling mode and the rate of change of the leaving fluid is positive and increasing.

MAKING ICE Chiller is in an unoccupied mode and is using Cooling Set Point 3 (Set Points

STORING ICE Chiller is in an unoccupied mode and is controlling to Cooling Set Point 2 (Set Points

HIGH SCT CIRCUIT A Chiller is in a Cooling mode and the Saturated Condensing Temperature (SCT) is greater than

MINIMUM COMP ON TIME Cooling load may be satisfied, however control continues to operate compressor to ensure

PUMP OFF DELAY TIME Cooling load is satisfied, however cooler pump continues to run for the number of minutes set

is dropped is limited to a predetermined value to prevent compressor overloading. See Cooling Ramp Loading (Configuration desired, to any rate from 0.2° F to 2° F (0.1° to 1° C)/minute.

schedule, forcing unit to Occupied mode. Override can be implemented with unit under Local (Enable) or CCN (Carrier Comfort Network

urated Suction Temperature is not increasing greater than 1.1° F (0.6° C) in 10 seconds. If the saturated suction temperature is less than the Brine Freeze Point (Set Points



BR.FZ) minus 6° F (3.4° C) and less than the leaving fluid temperature minus 14° F (7.8° C) for 2 minutes, a stage of capacity will be removed from the circuit. Or, If the saturated suction temperature is less than the Brine Freeze Point minus 14° F (7.8° C), for 90 seconds, a stage of capacity will be removed from the circuit. The control will continue to decrease capacity as long as either condition exists.

towards the control point.



CSP.1) during occupied periods and Cooling Set Point 2 (Set PointsCOOLCSP.2) during unoccupied periods.

ing fluid set point upward and is currently controlling to the modified set point. The set point can be modified based on return fluid, outdoor-air-temperature, space temperature, or 4 to 20 mA signal.

demand limit control option. Because of this limitation, the chiller may not be able to produce the desired leaving fluid temperature. Demand limit can be controlled by switch inputs or a 4 to 20 mA signal.

for definition). The chiller will be shut down when either fluid temperature falls below the Freeze point.

decreasing faster than -0.5° F per minute. Error between leaving fluid and control point exceeds fixed amount. Control will automatically unload the chiller if necessary.

Error between leaving fluid and control point exceeds fixed amount. Control will automatically load the chiller if necessary to better match the increasing load.



CSP.3) to make ice. The ice done input to the Energy Management Module (EMM) is open.



CSP.2). The ice done input to the Energy Management Module (EMM) is closed.

the calculated maximum limit. No additional stages of capacity will be added. Chiller capacity may be reduced if SCT continues to rise to avoid high-pressure switch trips by reducing condensing temperature.

proper oil return. May be an indication of oversized application, low fluid flow rate or low loop volume.

by the configuration variable Cooler Pump Shutdown Delay (Configuration



PM.DY).



SLCTCRMP). The pull-down limit can be modified, if

) control. Override expires after each use.



OPT2DELY).





COOL



OPT1

FRZ

COOL



COOL



CONTROLS

General —

ComfortLink™ electronic control system that controls and monitors all operations of the chiller.

The control system is composed of several components as listed in the sections below. See Fig. 3 for a typical control box drawing. See Fig. 4 and 5 for control schematics.

The 30MP liquid scroll chillers contain the

Main Base Board (MBB) — See Fig. 6. The MBB is

the heart of the ComfortLink control system. It contains the major portion of operating software and controls the operation of the machine. The MBB continuously monitors input/output channel information received from its inputs and from all other modules. The MBB receives inputs from the discharge and suction pressure transducers and thermistors. See Table 15. The MBB also receives the feedback inputs from each compressor current sensor board and other status switches. See Table 16. The MBB also controls several outputs. Relay outputs controlled by the MBB are shown in Table 17. Information is transmitted between modules via a 3-wire communication bus or LEN (Local Equipment Network). The CCN (Carrier Comfort Network) bus is also supported. Connections to both LEN and CCN buses are made at the LVT (low voltage terminal).

Energy Management Module (EMM) — The EMM

module is available as a factory-installed option or as a fieldinstalled accessory. The EMM module receives 4 to 20 mA inputs for the leaving fluid temperature reset, cooling set point and demand limit functions. The EMM module also receives the switch inputs for the field-installed 2-stage demand limit and ice done functions. The EMM module communicates the status of all inputs with the MBB, and the MBB adjusts the control point, capacity limit, and other functions according to the inputs received.

Current Sensor Board (CSB) — The CSB is used to

monitor the status of the compressors by measuring current and providing an analog input to the main base board (MBB).

Enable/Off/Remote Contact Switch — The Enable/

Off/Remote Contact switch is a 3-position switch used to control the chiller. When switched to the Enable position the chiller is under its own control. Move the switch to the Off position to shut the chiller down. Move the switch to the Remote Contact position and a field-installed dry contact can be used to start the chiller. The contacts must be capable of handling a 24 vac, 50-mA load. In the Enable and Remote Contact (dry contacts closed) positions, the chiller is allowed to operate and respond to the scheduling configuration, CCN configuration and set point data. See Fig. 7.

Emergency On/Off Switch — The Emergency On/Off

switch should only be used when it is required to shut the chiller off immediately. Power to the MBB, EMM, and marquee display is interrupted when this switch is off and all outputs from these modules will be turned off. See Fig. 7.

Board Addresses — The main base board (MBB) has a

3-position instance jumper that must be set to ‘1.’ The EMM board has 4-position DIP switches. All switches are set to ‘On’ for all boards except the AUX2 board. The AUX2 board DIP switch settings are shown on the wiring schematic.

Control Module Communication

RED LED — Proper operation of the control boards can be visually checked by looking at the red status LEDs (light-emitting diodes). When operating correctly, the red status LEDs should be blinking in unison at a rate of once every 2 seconds. If the red LEDs are not blinking in unison, verify that correct power is being supplied to all modules. Be sure that

the main base board (MBB) is supplied with the current software. If necessary, reload current software. If the problem still persists, replace the MBB. A red LED that is lit continuously or blinking at a rate of once per second or faster indicates that the board should be replaced.

GREEN LED — The MBB has one green LED. The Local Equipment Network (LEN) LED should always be blinking whenever power is on. All other boards have a LEN LED which should be blinking whenever power is on. Check LEN connections for potential communication errors at the board J3 and/or J4 connectors. Communication between modules is accomplished by a 3-wire sensor bus. These 3 wires run in parallel from module to module. The J4 connector on the MBB provides both power and communication directly to the marquee display only.

YELLOW LED — The MBB has one yellow LED. The Carrier Comfort Network (CCN) LED will blink during times of network communication.

Carrier Comfort Network® (CCN) Interface —

The 30MP chiller units can be connected to the CCN if desired. The communication bus wiring is a shielded, 3-conductor cable with drain wire and is supplied and installed in the field. See Table 18. The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system elements on either side of it. This is also required for the negative and signal ground pins of each system element. Wiring connections for CCN should be made at LVT. Consult the CCN Contractor’s Manual for further information.

NOTE: Conductors and drain wire must be 20 AWG (American Wire Gage) minimum stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum operating temperature range of –20 C to 60 C is required. Wire manufactured by Alpha (2413 or 5463), American (A22503), Belden (8772), or Columbia (02525) meets the above mentioned requirements.

It is important when connecting to a CCN communication bus that a color coding scheme be used for the entire network to simplify the installation. It is recommended that red be used for the signal positive, black for the signal negative, and white for the signal ground. Use a similar scheme for cables containing different colored wires.

At each system element, the shields of its communication bus cables must be tied together. If the communication bus is entirely within one building, the resulting continuous shield must be connected to a ground at one point only. If the communication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building (one point per building only). To connect the unit to the network:

1. Turn off power to the control box.

2. Cut the CCN wire and strip the ends of the red (+), white (ground), and black (–) conductors. (Substitute appropriate colors for different colored cables.)

3. Connect the red wire to (+) terminal on LVT of the plug, the white wire to COM terminal, and the black wire to the (–) terminal.

4. The RJ14 CCN connector on LVT can also be used, but is only intended for temporary connection (for example, a laptop computer running Service Tool).

LEGEND FOR FIG. 3-5

ALMR — Alarm Relay AUX — Auxilliary C—Contactor, Compressor CB — Circuit Breaker CCB — Compressor Circuit Breaker CH — Crankcase Heater CCH — Crankcase Heater Relay COMP — Compressor CR — Control Relay CSB — Current Sensor Board CWFS — Chilled Water Flow Switch CWP — Chilled Water Pump DGS — Digital Scroll Compressor DPT — Discharge Pressure Transducer DTT — Discharge Temperature Thermistor DUS — Digital Unloader Solenoid EMM — Energy Management EWT — Entering Water Temperature FB — Fuse Block FIOP — factory Installed Option FU — Fuse GND — Ground HPS — High-Pressure Switch LLSV — Liquid Line Solenoid Valve LON — Local Operating Network LV T — Low Voltage Terminal LWT — Leaving Water Temperature MBB — Main Base Board MLV — Minimum Load Valve MP — Modular Motor Protection NEC — National Electrical Code OAT — Outdoor-Air Thermistor PL — Plug RLY — Relay SPT — Suction Pressure Transducer SW — Switch TB — Terminal Block TRAN — Transformer UPC — Unitary Protocol Converter

Terminal Block

Terminal (Unmarked)

Terminal (Marked)

Splice

Factory Wiring

Field Wiring

Accessory or Option Wiring

To indicate common potential only; not to represent wiring.

EQUIP

Fig. 3 — Typical Control Box — 30MP015-045 Units

a30-4963

GND

TB3

UPC LON OPTION

UPC

DISCONNECT OPTION CB1A/TB1A

TRAN1

LVT

CCB-1

CCB-2

CCB-3

EMM

CSB-A1

CSB-A2

CSB-A3

CCH

CA1 CA2

CA3

MBB

FB1

LOCATED OVER EMM

CB1

CB2

REMOTE CONTROL

OFF

SW1

ENABLE

CB3

OFF

SW2

COMP A2

TRAN1

SECONDARY 24V

RED

BRN

VIO

FU3

SW2

CONNECT FOR

APPROPRIATE

PRIMARY VOLTAGE

SEE TABLE 1

CB1A

TO FUSED

DISCONNECT

PER NEC

OPTIONAL

DISCONNECT

3.2 AMPS

CB3

GRN/YEL

RED

CA1

BLK

YEL

BLU

13 23

CA2

CCB-1

BLK

YEL

BLU

BLK

YEL

BLU

YEL

BLU BLK

YEL

BLU

BLK

CCB-2

BLK

YEL

BLK

015,020,040: 380V,460V,575V ONLY

030,045: 460V,575V ONLY

BLU

YEL

BLU

GRN/YEL

CA3

BLK

YEL

BLU

CCB-3

BLK

YEL

BLU

YEL

BLU

BLK

BLU

YEL

BLK

YEL

CH-A1

BLK

YEL

L1 T1

L2 T2

BLK

YEL

CH-A2

BLK

YEL

CH-A3

BLK

YEL

BLK

015,020,040: 208/230V ONLY

030,045: 202/230V,380V ONLY

MBB

BRN

VIO

UPC FIOP

UPC

GND

HOT

24VAC

BRN

VIO

DGS FIOP

AUX2

BRN

RED

FIOP/ACCESSORY

EMM

FU1

BLK

FU2

YEL

GRN/YEL

RED

VIO

BRN

PRIMARY

WHT

380V

UNITS ONLY

NOT USED ON

380V UNITS

FB1

BLK

YEL

NOTES:

1. FACTORY WIRING IS IN ACCORDANCE WITH UL 1995 STANDARDS.

ANY FIELD MODIFICATIONS OR ADDITIONS MUST BE IN

COMPLIANCE WITH ALL APPLICABLE CODES.

C MIN WIRE FOR FIELD POWER SUPPLY.

3. ALL FIELD INTERLOCK CONTACTS MUST HAVE A MIN RATING OF

2 AMPS @ 24VAC SEALED. SEE FIELD INTERLOCK WIRING.

4. COMPRESSOR AND FAN MOTORS ARE THERMALLY PROTECTED--

THREE PHASE MOTORS PROTECTED AGAINST PRIMARY SINGLE

PHASE CONDITIONS.

5. TERMINALS 14

& 15 OF LVT ARE FOR FIELD CONNECTION

OF REMOTE ON-OFF. THE CONTACT MUST BE RATED FOR DRY

CIRCUIT APPLICATION CAPABLE OF HANDLING A 5VDC

1 MA TO 20 MA LOAD.

6. FOR 500 SERIES UNIT OPERATION AT 208-3-60V LINE VOLTAGE,

TRAN1 PRIMARY CONNECTIONS MUST BE MOVED TO TERMINALS H3 & H4.

8. MP-A1 NOT USED IN THE FOLLOWING UNITS:

015,020: ALL UNITS

9. MP-A2 NOT USED IN THE FOLLOWING UNITS:

015,020: ALL UNITS

10. MP-A3 NOT USED IN THE FOLLOWING UNITS:

11. JUMPER PLUG REQUIRED WHEN MP NOT USED

WHT

(040,045 ONLY)

VOLTAGE SERIES

TERMINAL

CONNECTIONS

FOR PRIMARY SIDE

575-3-60 100 H1 & H5

380-3-60 200 H1 & H2

230-3-60 500 H2 & H4

208-3-60 500 H3 & H4

460-3-60 600 H1 & H4

TABLE 1

7. MAX LOAD: 5VA SEALED, 10VA INRUSH

(040,045 ONLY)

BLK

YEL

(MPA ONLY)

WHT

BLK

YEL

FU4

FU5

UNIT VOLTAGE

REPLACE

WITH

FNQ-R-3

FU1 & FU2

FUSE

NUMBER

380-3-60

TRAN

SIZE

200VA

FNQ-R-2

208/230-3-60

FNQ-R-10

FU3 (24V)

380-3-60,460-3-60,575-3-60

250VA

208/230-3-60

460-3-60

575-3-60

FNQ-R-1.5

FU4 & FU5

380-3-60,460-3-60,575-3-60

NONE

208/230-3-60

(040,045 ONLY)(040,045 ONLY)

12. IF CHILLED WATER PUMP INTERLOCK IS USED,

REMOVE JUMPER FROM TERMINAL 16 TO 17 AND

WIRE INTERLOCK CONTACT ACROSS TERMINALS 16 & 17.

030-045: 460V UNITS WITHOUT DIGITAL SCROLL

030-045: 460V UNITS

040,045: 460V UNITS

FNQ-R-3

TB3

380V ONLY

PL11-2

PL11-1

PL12-2

PL12-1

CCH

PL13-2

PL13-1

STANDARD

TERMINAL

BLOCK

PER NEC

TO FUSED DISCONNECT

TB1A

EQUIP GND

COMP A1

COMP A3

380V UNITS ONLY

NEUTRAL

CSB-A1

CSB-A2

CSB-A3

Fig. 4 — Typical Power Wiring Schematic — 30MP015-045 Units

a30-4965

J10A

Fig. 5 — Typical Control Wiring Schematic — 30MP015-045 Units

a30-4966

J10B

CWPI (SEE NOTE

12)

REMOTE

ON-OFF

SWITCH

(SEE

NOTE 5)

DUAL

SETPOINT

CNPI

CNFS

RED

WHT

BLK

RED

BLK

WHT

RLY 11

RLY 9

RLY 10

RLY 5

RLY 6

RLY 7

RLY 8

RLY 1

RLY 2

RLY 3

RLY 4

MBB

LEN CCN

LVT

(COM)

SHIELD

PORT 2

PORT 1A

(+)

(-)

UPC

NET +

NET -

N/C

SIGNAL

NET +

NET 2

SHIELD

CB2

3.2 AMPS

ORN

BLK

ENABLE

RED

WHT

SW1

RED

BLU

VIO

BRN

RED

BLK

WHT

RED

BLK

WHT

RED

J11

CWFS

BLK

VIO

RED

J13

BLK

WHT

RED

BRN

RED

BLK

WHT

RED

OPTION

UPC OPT

OFF

ORN

LON

GND

NET

SW2

RED

ORN

CB1

ORN

3.2 AMPS

PNK

GRA

PNK

BLU

ORN

PNK

RED

LVT

J12

J11

RED

BLU

HPS-A

BLK

ORN

GRA

VIO

PNK

SEE NOTE 11

MP-A1

VIO

MP-A2

VIO

MP-A3

VIO

GRA

PNK

CSB

RED

WHT

BLK

RED

BRN

(040,045 ONLY)

CONDENSER EWT ACCESSORY

CONDENSER LWT ACCESSORY

RGTA ACCESSORY

COOLER ENTERING FLUID TEMP

COOLER LEAVING FLUID TEMP

DPTA

SPTA

MARQUEE DISPLAY

LVT

J12 T55

BOARD

MAIN BASE

RED

WHT

BLK

BRN

RED

WHT

BLK

RED

ORN

BRN

RED

ORN

BRN

RED

ORN

BRN

BLU

VIO

RED

BLK

RED

BLK

RED

GRN

BLK

RED

GRN

BLK

TRAN1

SECONDARY 24V

FU3

ALMR

ALARM RELAY

SEE NOTE 7

CWP RELAY SEE NOTE 7

CONDENSER FAN/PUMP RELAY

SEE NOTE 7

CONDENSER

WATER VALVE

(MPB ONLY)

RED

GRA

(MPA AND BRINE ONLY)

BLU

PL1-2PL1-1

VIO

ORN

PL2-2PL2-1

VIO

GRA

PL3-2PL3-1

VIO

(040,045 ONLY)

GRA

PNK

BRN

PL1-3

PNK

RED

PL2-3

PNK

RED

PL3-3

PNK

RED

T-55

SEN

ACCSY

OAT ACCESSORY OR DUAL CHILLER LWT

LLSV-A

CCH

(MPA ONLY)

CA1

CA2

CA3

MLV-A

MLV FIOP

CWFS

SEE NOTE 8

T2T1MP-A1

SEE NOTE 9

T2T1MP-A2

SEE NOTE 10

T2T1MP-A3

GRN/YEL

BRN

TB3

TRAN1

BRN

C2C1

BRN

BLU

PL1-4

BRN

PL2-4

BRN

PL3-4

BRN

BLK

WHT

RED

BLK

WHT

RED

BLK

WHT

RED

BRN

AUX2

DGS

FIOP

12345678

DARK = SWITCH LOCATION

EMM

FIOP/

ACCESSORY

CWFS-3

LLSV-A

TB3

MLV-A

CA3

MLV-A

PL1-4

PL2-4

PL3-4

CCH

PL3-4

LLSV-A

CCH

TB3

CA1

CA2

CA3

OFF

CH1

CH11

GRA

RED

BLU

VIO

BRN

ORN

PNK

DUS

VIO

BRN

RED

BLK

DTT

LVT

J10

ICE DONE

DLS STEP 1

DLS STEP 2

DEMAND

LIMIT

4-20mA

TEMP

RESET

4-20mA

COOLING

SETPOINT

4-20mA

IMPORTANT: A shorted CCN bus cable will prevent some routines from running and may prevent the unit from starting. If abnormal conditions occur, unplug the connector. If conditions return to normal, check the CCN connector and cable. Run new cable if necessary. A short in one section of the bus can cause problems with all system elements on the bus.

Table 15 — Thermistor Designations

THERMISTOR

CLWT J8-13,14 (MBB) Cooler Leaving Fluid CEWT J8-11,12 (MBB) Cooler Entering Fluid

RGTA

OAT

SPT

CNDE

CNDL

LEGEND

LWT — Leaving Water Temperature MBB — Main Base Board

CONNECTION

POINT

J8-9,10 (MBB) Circuit A Return Gas

J8-6,7 (MBB), LVT 4,13

J8-5,6 (MBB) LV T-3 , 4

J8-1,2 Condenser Entering Water

J8-3,4 Condenser Leaving Water

THERMISTOR INPUT

Temperature (accessory) Outdoor-Air Temperature

Sensor (accessory) or Dual LWT Sensor

Accessory Remote Space Temperature Sensor

Temperature Sensor

Table 16 — Status Inputs

STATUS SWITCH PIN CONNECTION POINT

Condenser Flow Switch LVT-11,17, J7-2, J6-2

Dual Set Point LVT-12,13, J7-3,4

Remote On/Off LVT-14,15 Cooler Flow Switch Interlock LVT-16,17, J6-2, J7-10 Compressor Fault Signal, A1 J9-11,12 Compressor Fault Signal, A2 J9-5,6 Compressor Fault Signal, A3 J9-8,9

Table 17 — Output Relays

RELAY

NO.

K1 Energize Compressor A1 K2 Energize Compressor A2 K3 Energize Compressor A3 K4 Energize Minimum Load Valve K5 Water Valve Open K6 Water Valve Close K7 Liquid Line Solenoid Valve K8 Crankcase Heater Relay (30MPA Only)

K9 Chilled Water Pump K10 Condenser Fan/Pump K11 Alarm Relay

DESCRIPTION

Table 18 — CCN Communication Bus Wiring

MANUFACTURER

Alpha 1895 — American A21451 A48301 Belden 8205 884421 Columbia D6451 — Manhattan M13402 M64430 Quabik 6130 —

Regular Wiring Plenum Wiring

PART NO.

Sensors — The electronic control uses 2 to 7 thermistors to

sense temperatures for controlling chiller operation. See Table 15. These sensors are outlined below. Thermistors

RGTA, CNDE, CNDL, EWT, LWT, and OAT are identical in temperature versus resistance and voltage drop performance. The dual chiller thermistor (DLWT) is 5 k at 77 F (25 C) thermistor. Space temperature thermistor (SPT) is a 10 kat 77 F (25 C). See Thermistors section for temperature-resistance-voltage drop characteristics.

COOLER LEAVING FLUID SENSOR (LWT) — The thermistor is installed in a well in the factory-installed leaving fluid piping coming from the bottom of the brazed-plate heat exchanger.

COOLER ENTERING FLUID SENSOR (EWT) — The thermistor is installed in a well in the factory-installed entering fluid piping coming from the top of the brazed-plate heat exchanger.

CONDENSER LEAVING FLUID SENSOR (CNDL) — The thermistor is installed in a well in the factory-installed leaving fluid piping coming from the bottom of the brazed-plate heat exchanger.

COOLER ENTERING FLUID SENSOR (CNDE) — The thermistor is installed in a well in the factory-installed entering fluid piping coming from the top of the brazed-plate heat exchanger.

COMPRESSOR RETURN GAS TEMPERATURE SENSOR (RGTA) — This accessory thermistor can be installed in a well located in the suction line.

OUTDOOR-AIR TEMPERATURE SENSOR (OAT) — This sensor is an accessory that is remotely mounted and used for outdoor air temperature reset. See Table 15.

DUAL LEAVING WATER TEMPERATURE SENSOR (DLWT) — This input can be connected to the LVT. See Table 15. For dual chiller applications (parallel only are supported), connect the dual chiller leaving fluid temperature sensor (5 kthermistor, Carrier part no. HH79NZ029) to the outside air temperature input of the Master chiller. If outside air temperature is required for reset applications, connect the sensor to the Slave chiller and configure the slave chiller to broadcast the value to the Master chiller.

REMOTE SPACE TEMPERATURE SENSOR (SPT) — The sensor (part no. 33ZCT55SPT) is an accessory sensor that is remotely mounted in the controlled space and used for space temperature reset. The sensor should be installed as a wallmounted thermostat would be (in the conditioned space where it will not be subjected to either a cooling or heating source or direct exposure to sunlight, and 4 to 5 ft above the floor).

Space temperature sensor wires are to be connected to terminals in the unit main control box. The space temperature sensor includes a terminal block (SEN) and a RJ11 female connector. The RJ11 connector is used access into the Carrier Comfort Network

(CCN) at the sensor.

To connect the space temperature sensor (Fig. 8):

1. Using a 20 AWG twisted pair conductor cable rated for the application, connect 1 wire of the twisted pair to one SEN terminal and connect the other wire to the other SEN terminal located under the cover of the space temperature sensor.

2. Connect the other ends of the wires to terminals 3 and 4 on LVT located in the unit control box.

Units on the CCN can be monitored from the space at the sensor through the RJ11 connector, if desired. To wire the RJ11 connector into the CCN (Fig. 9):

IMPORTANT: The cable selected for the RJ11 connector wiring MUST be identical to the CCN communication bus wire used for the entire network. Refer to Table 18 for acceptable wiring.

1. Cut the CCN wire and strip ends of the red (+), white (ground), and black (–) conductors. (If another wire color scheme is used, strip ends of appropriate wires.)

CEPL130346-01

STATUS

LEN

J10

CCN

RED LED - STATUS GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

YELLOW LED CCN (CARRIER COMFORT NETWORK)

INSTANCE JUMPER

K11

K10 K9

K3 K2

Fig. 6 — Main Base Board

Fig. 7 — Enable/Off/Remote Contact Switch, and Emergency On/Off Switch Locations

SPT (T10) PART NO. 33ZCT55SPT

SENSOR

SEN

LVT

Fig. 8 — Typical Space Temperature

Sensor Wiring

T-55 SPACE SENSOR

CCN+

CCN GND

CCN-

TO CCN COMM 1 BUS (PLUG) AT UNIT

Fig. 9 — CCN Communications Bus Wiring to Optional Space Sensor RJ11 Connector

a30-4967

a30-4968

2. Insert and secure the red (+) wire to terminal 5 of the space temperature sensor terminal block.

3. Insert and secure the white (ground) wire to terminal 4 of the space temperature sensor.

4. Insert and secure the black (–) wire to terminal 2 of the space temperature sensor.

5. Connect the other end of the communication bus cable to the remainder of the CCN communication bus.

Energy Management Module (Fig. 10) — This

factory-installed option (FIOP) or field-installed accessory is used for the following types of temperature reset, demand limit, and/or ice features:

• 4 to 20 mA leaving fluid temperature reset (requires field-supplied 4 to 20 mA generator)

• 4 to 20 mA cooling set point reset (requires fieldsupplied 4 to 20 mA generator)

• Discrete inputs for 2-step demand limit (requires fieldsupplied dry contacts capable of handling a 24 vac, 50 mA load)

• 4 to 20 mA demand limit (requires field-supplied 4 to 20 mA generator)

• Discrete input for Ice Done switch (requires fieldsupplied dry contacts capable of handling a 24 vac, 50 mA load)

See Demand Limit and Temperature Reset sections on

pages 27 and 31 for further details.

CAUTION

Care should be taken when interfacing with other manufacturer’s control systems due to possible power supply differences, full wave bridge versus half wave rectification. The two different power supplies cannot be mixed. ComfortLink™ controls use half wave rectification. A signal isolation device should be utilized if a full wave bridge signal generating device is used.

Loss-of-Cooler Flow Protection — A proof-of-

cooler flow device is factory installed in all chillers.

Condenser Flow Protection — A proof-of-condens-

er flow protection accessory can be field installed in the condenser water piping of all chillers. The unit must be configured for the input to be enabled.

Thermostatic Expansion Valves (TXV) — All

units are equipped from the factory with conventional TXVs. The 30MPA units and 30MPW units with medium temperature brine also have factory-installed liquid line solenoids. The liquid line solenoid valves are not intended to be a mechanical shut-off. For 30MPW units, when service is required, reclaim the refrigerant from the system.

For 30MPA units when service is required, the compressor and evaporator can be serviced by closing the factory-installed liquid line service valve and field-installed discharge line service valve. After the valves are closed, reclaim the refrigerant from the system.

The TXV is set at the factory to maintain approximately 8 to 12° F (4.4 to 6.7° C) suction superheat leaving the cooler by monitoring the proper amount of refrigerant into the cooler. All TXVs are adjustable, but should not be adjusted unless abso- lutely necessary.

Capacity Control — The control system cycles com-

pressors, digital scroll modulting solenoid (if equipped), and minimum load valve solenoids (if equipped) to maintain the user-configured leaving chilled fluid temperature set point. Entering fluid temperature is used by the main base board (MBB) to determine the temperature drop across the cooler and is used in determining the optimum time to add or subtract capacity

stages. The chilled fluid temperature set point can be automatically reset by the return fluid temperature, space, or outdoor-air temperature reset features. It can also be reset from an external 4 to 20-mA signal (requires energy management module FIOP or accessory).

The capacity control algorithm runs every 30 seconds. The algorithm attempts to maintain the Control Point at the desired set point. Each time it runs, the control reads the entering and leaving fluid temperatures. The control determines the rate at which conditions are changing and calculates 2 variables based on these conditions. Next, a capacity ratio is calculated using the 2 variables to determine whether or not to make any changes to the current stages of capacity. This ratio value ranges from –100 to +100%. If the next stage of capacity is a compressor, the control starts (stops) a compressor when the ratio reaches +100% (–100%). If installed, the minimum load valve solenoid will be energized with the first stage of capacity. Minimum load valve value is a fixed 30% in the total capacity calculation. The control will also use the minimum load valve solenoid as the last stage of capacity before turning off the last compressor. A delay of 90 seconds occurs after each capacity step change. Refer to Table 19.

MINUTES LEFT FOR START — This value is displayed only in the network display tables (using Service Tool, ComfortVIEW™ or ComfortWORKS represents the amount of time to elapse before the unit will start its initialization routine. This value can be zero without the machine running in many situations. This can include being unoccupied, ENABLE/OFF/REMOTE CONTACT switch in the OFF position, CCN not allowing unit to start, Demand Limit in effect, no call for cooling due to no load, and alarm or alert conditions present. If the machine should be running and none of the above are true, a minimum off time (DELY, see below) may be in effect. The machine should start normally once the time limit has expired.

MINUTES OFF TIME (Configuration DELY) — This user-configurable time period is used by the control to determine how long unit operation is delayed after power is applied/restored to the unit. Typically, this time period is configured when multiple machines are located on a single site. For example, this gives the user the ability to prevent all the units from restarting at once after a power failure. A value of zero for this variable does not mean that the unit should be running.

LEAD/LAG DETERMINATION — This is a configurable choice and is factory set to be automatic for all units unless the unit is equipped with minimum load, then circuit A is lead (Configuration to Circuit A or Circuit B leading as desired. Set at automatic, the control will sum the current number of logged circuit starts and one-quarter of the current operating hours for each circuit. The circuit with the lowest sum is started first. Changes to which circuit is the lead circuit and which is the lag are also made when total machine capacity is at 100% or when there is a change in the direction of capacity (increase or decrease) and each circuit’s capacity is equal.

CAPACITY CONTROL OVERRIDES — The following overrides will modify the normal operation of the routine.

Deadband Multiplier Multiplier (Configuration value of 1.0. The range is from 1.0 to 4.0. When set to other than 1.0, this factor is applied to the capacity Load/Unload Factor. The larger this value is set, the longer the control will delay between adding or removing stages of capacity. Figure 11 shows how compressor starts can be reduced over time if the leaving water temperature is allowed to drift a larger amount above and below the set point. This value should be set in the range of 3.0 to 4.0 for systems with small loop volumes. Figure 12 shows the operating envelope for the compressor.



OPT2 LLCS). The value can be changed

— The user configurable Deadband



SLCTZ.GN) has a default

software) and



OPT2



First Stage Override

CEBD430351-0396-01C

TEST 1

CEPL130351-01

PWR

TEST 2

J4 J3

LEN

STATUS

RED LED - STATUS

GREEN LED LEN (LOCAL EQUIPMENT NETWORK)

ADDRESS DIP SWITCH

Fig. 10 — Energy Management Module

— If the current capacity stage is zero, the control will modify the routine with a 1.2 factor on adding the first stage to reduce cycling. This factor is also applied when the control is attempting to remove the last stage of capacity.

Slow Change Override

— The control prevents the capacity stages from being changed when the leaving fluid temperature is close to the set point (within an adjustable deadband) and moving towards the set point.

*Hot gas bypass (minimum load) valve energized. NOTE: These capacity steps may vary due to different capacity

Table 19 — Part Load Data Percent Displacement, Standard Units with Minimum Load Valve

30MP UNIT SIZE

015

020

030

040

045

CONTROL

STEPS

1 2 3

1 2 3 4

staging sequences.

CAPACITY STEPS

(% Displacement)

18*

50 100

25*

50 100

34*

50 100

21*

33 67 100

22*

33 67 100

0 200 400 600 800 1000

TIME (SECONDS)

2 STARTS

3 STARTS

DEADBAND EXAMPLE

LWT (F)

MODIFIED DEADBAND

STANDARD DEADBAND

LWT (C)

LEGEND

LWT — Leaving Water Temperature

Fig. 11 — Deadband Multiplier

170

140

150

160

110

120

130

100

-30 -20 -10 0 10 20 304050607080

SCT (F)

SST (F)

LEGEND

Fig. 12 — Operating Envelope for R-410A Compressor

SCT —

Saturated Condensing Temperature

SST —

Saturated Suction Temperature

a30-4969

Ramp Loading

tion



SLCTCRMP) limits the rate of change of leaving

fluid temperature. If the unit is in a Cooling mode and configured for Ramp Loading, the control makes 2 comparisons before deciding to change stages of capacity. The control calculates a temperature difference between the control point and leaving fluid temperature. If the difference is greater than 4° F (2.2° C) and the rate of change (°F or °C per minute) is more than the configured Cooling Ramp Loading value (CRMP), the control does not allow any changes to the current stage of capacity.

Low Entering Fluid Temperature Unloading entering fluid temperature is below the control point, the control will attempt to remove 25% of the current stages being used. If exactly 25% cannot be removed, the control removes an amount greater than 25% but no more than necessary. The lowest stage will not be removed.

Hot Gas Bypass energized only when one compressor is running on circuit A. If the close control feature is enabled the hot gas bypass valve

— Ramp loading (Configura-

may be used as needed to obtain leaving fluid temperature close to set point.

Cooler Freeze Protection shutting the chiller down on a Cooler Freeze Protection alarm by removing stages of capacity. If the cooler fluid selected is Water, the freeze point is 34 F (1.1 C). If the cooler fluid selected is Brine, the freeze point is the Brine Freeze Point (Set

Points

references leaving fluid temperature and NOT Brine Freeze point. If the cooler leaving fluid temperature is less than the freeze point plus 2.0° F (1.1° C), the control will immediately

— When the

remove one stage of capacity. This can be repeated once every 30 seconds.

Low Saturated Suction Protection prevent shutting a circuit down due to low saturated suction conditions by removing stages of capacity. The circuit alert condition (T116) compares saturated suction temperature to the

— If equipped, the hot gas bypass valve is

configured Brine Freeze Point (Set Points The Brine Freeze point is a user-configurable value that must be left at 34 F (1.1 C) for 100% water systems. A lower value

— The control will try to prevent



FRZBR.FZ). This alarm condition (A207) only

— The control will try to



FRZBR.FZ).

may be entered for systems with brine solutions, but this value

ENTER

ESCAPE

should be set according to the freeze protection level of the brine mixture. Failure to properly set this brine freeze point value may permanently damage the brazed plate heat exchanger. The control will initiate Mode 7 (Circuit A) to indicate a circuit’s capacity is limited and that eventually the circuit may shut down.

Operation of Machine Based on Control Method and Cooling Set Point Selection Settings —

configuration of the Control Method (Configuration



OPT2CTRL) and Cooling Set Point Select

(ConfigurationSLCTCLSP) variables. All units are factory configured with Cooling Set Point Select set to 0 (single set point). With the control method set to 0, simply switching the Enable/Off/Remote Contact switch to the Enable or Remote Contact position (external contacts closed) will put the chiller in an occupied state. The control mode (Run

Status

switch is Off and will be 5 (ON LOCAL) when in the Enable position or Remote Contact position with external contacts closed.

Two other control methods are available for Machine On/

Off control: OCCUPANCY SCHEDULE (Configuration



CTRL = 1) — The main base board will use the operating schedules as defined under the Time Clock mode in the scrolling marquee display. These schedules are identical. The schedule number must be set to 1 for local schedule.

The schedule number can be set anywhere from 65 to 99 for operation under a CCN global schedule. The Enable/Off/ Remote Contact must be in the Enable or Remote Contact position. The control mode (Run Status 1 when the switch is Off. The control mode will be 3 when the Enable/Off/Remote Contact switch input is On and the time of day is during an unoccupied period. Similarly, the control mode will be 7 when the time of day is during an occupied period.

CCN SCHEDULE (Configuration

2) — An external CCN device such as Chillervisor System Manager controls the On/Off state of the machine. This CCN device forces the variable ‘CHIL_S_S’ between Start/Stop to control the chiller. The control mode (Run Status



VIEWSTAT) will be 1 when the switch is Off. The con-

trol mode will be 2 when the Enable/Off/Remote Contact switch input is On and the CHIL_S_S variable is ‘Stop.’ Similarly, the control mode will be 6 when the CHIL_S_S variable is ‘Start.’

Table 20 illustrates how the control method and cooling set point select variables direct the operation of the chiller and the set point to which it controls. The illustration also shows the ON/OFF state of the machine for the given combinations.

Machine On/Off control is determined by the



VIEWSTAT) will be 1 (OFF LOCAL) when the



VIEWSTAT) will be



OPT2CTRL =

OPT2

Cooling Set Point Select

SINGLE — Unit operation is based on Cooling Set Point 1 (Set Points



COOLCSP.1).

DUAL SWITCH — Unit operation is based on Cooling Set Point 1 (Set Points



COOLCSP.1) when the Dual Set

Point switch contacts are open and Cooling Set Point 2 (Set

Points



COOLCSP.2) when they are closed.

DUAL CCN OCCUPIED — Unit operation is based on Cooling Set Point 1 (Set Points



COOLCSP.1) during the

Occupied mode and Cooling Set Point 2 (Set

Points



COOLCSP.2) during the Unoccupied mode as

configured under the local occupancy schedule accessible only from CCN. Schedule Number in Table SCHEDOVR (See Appendix B) must be configured to 1. If the Schedule Number is set to 0, the unit will operate in a continuous 24-hr Occupied mode. Control method must be configured to 0 (switch). See Table 20.

4 TO 20 mA INPUT — Unit operation is based on an external 4 to 20 mA signal input to the Energy Management Module (EMM).

Cooler Pump Control — The AquaSnap® 30MP ma-

chines are configured with the Cooler Pump Control (Configuration



OPT1CPC) = ON.

The maximum load allowed for the Chilled Water Pump Starter is 5 VA sealed, 10 VA inrush at 24 volts. The starter coil is powered from the chiller control system. The starter should be wired between LVT 24 and TB3-1. If equipped, the field-installed chilled water pump starter auxiliary contacts should be connected in series with the chilled water flow switch between LVT 16 and LVT 17.

Ice Mode — When Ice Mode is enabled Cooling Setpoint

Select must be set to Dual Switch, Dual 7 day or Dual CCN Occupied and the Energy Management Module (EMM) must be installed. Unit operation is based on Cooling Setpoint 1 (CSP.1) during the Occupied mode, Ice Setpoint (CSP.3) dur- ing the Unoccupied mode with the Ice Done contacts open and Cooling Setpoint 2 (CSP.2) during the Unoccupied mode with the Ice Done contacts closed. These 3 set points can be utilized to develop your specific control strategy.

Service Test (See Table 4) — Both main power and

control circuit power must be on.

The Service Test function should be used to verify proper operation of condenser output, compressors, minimum load valve solenoid (if installed), cooler pump, and remote alarm relay. To use the Service Test mode, the Enable/Off/Remote Contact switch must be in the OFF position. Use the display keys and Table 4 to enter the mode and display TEST. Press

twice so that OFF flashes. Enter the password if required. Use either arrow key to change the TEST value to the ON position and press . Press and the button to enter the OUTS or COMP sub-mode.

Table 20 — Control Methods and Cooling Set Points

CONTROL

TYPE

(CTRL)

0 (switch)

2 (Occupancy)

3 (CCN)

*Dual set point switch input used. CSP1 used when switch input is open. CSP2 used when switch input is closed.

†Cooling set point determined from 4 to 20 mA input to energy management module (EMM) to terminals TB6-3,5.

OCCUPANCY

STATE

Occupied ON,CSP1 ON* ON,CSP1 ON† Unoccupied ON,CSP1 ON* ON,CSP2 ON Occupied ON,CSP1 ON* Illegal ON† Unoccupied OFF OFF Illegal OFF Occupied ON,CSP1 ON* ON,CSP1 ON† Unoccupied ON,CSP1 ON* ON,CSP2 ON†

(single)

COOLING SET POINT SELECT (CLSP)

(dual, switch)

(dual, occ)

(4 to 20 mA)

+ 56 hidden pages

Carrier MPW015-045 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual