Carrier 19XRT User Manual

19XRT

Hermetic Centrifugal Liquid Chillers

50/60 Hz

with PIC II Controls and HFC-134a

Start-Up, Operation, and Maintenance Instructions

SAFETY CONSIDERATIONS

Centrifugal liquid chillers are designed to provide safe
and reliable service when operated within design speci­fications. When operating this equipment, use good judg­ment and safety precautions to avoid damage to equip­ment and property or injury to personnel.

Be sure you understand and follow the procedures and
safety precautions contained in the chiller instructions
as well as those listed in this guide.

DO NOT VENT refrigerant relief valves within a building. Outlet
from rupture disc or relief valve must be vented outdoors in ac­cordance with the latest edition of ANSI/ASHRAE 15 (American
National Standards Institute/American Society of Heating, Refrig­eration, and Air Conditioning Engineers). The accumulation of re­frigerant in an enclosed space can displace oxygen and cause
asphyxiation.

PROVIDE adequate ventilation in accordance with ANSI/ASHRAE
15, especially for enclosed and low overhead spaces. 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.

DO NOT USE OXYGEN to purge lines or to pressurize a chiller
for any purpose. Oxygen gas reacts violently with oil, grease, and
other common substances.

NEVER EXCEED specified test pressures, VERIFY the allowable
test pressure by checking the instruction literature and the design
pressures on the equipment nameplate.

DO NOT USE air for leak testing. Use only refrigerant or dry
nitrogen.

DO NOT VALVE OFF any safety device.
BE SURE that all pressure relief devices are properly installed and

functioning before operating any chiller.

DO NOT WELD OR FLAMECUT any refrigerant line or vessel
until all refrigerant (liquid andvapor)hasbeenremovedfromchiller.
Traces of vapor should be displaced with dry air or nitrogen and
the work area should be well ventilated. Refrigerant in contact with

an open flame produces toxic gases.

DO NOT USE eyebolts or eyebolt holes to rig chiller sections or
the entire assembly.

DO NOT work on high-voltage equipment unless you are a quali­fied electrician.

DO NOTWORKON electrical components, including control pan­els, switches, starters, or oil heater until you are sure ALLPOWER
IS OFF and no residual voltage can leak from capacitors or solid­state components.

LOCK OPENANDTAGelectrical circuits during servicing.IF WORK
IS INTERRUPTED, confirm that all circuits are deenergized be­fore resuming work.

AVOID SPILLING liquid refrigerant on skin or getting it into the
eyes. USE SAFETY GOGGLES. Wash any spills from the skin
with soap and water. If liquid refrigerant enters the eyes, IMME­DIATELY FLUSH EYES with water and consult a physician.

NEVER APPLY an open flame or live steam to a refrigerant

cylinder. Dangerous over pressure can result. When it is necessary
to heat refrigerant, use only warm (110 F [43 C]) water.

DO NOT REUSE disposable (nonreturnable) cylinders or
attempt to refill them. It is DANGEROUS AND ILLEGAL. When
cylinder is emptied, evacuate remaining gas pressure, loosen
the collar and unscrew and discard the valve stem. DO NOT
INCINERATE.

CHECK THE REFRIGERANT TYPE before adding refrigerant to
the chiller.The introduction of the wrong refrigerant can cause dam­age or malfunction to this chiller.

Operation of this equipment with refrigerants other than those
cited herein should comply with ANSI/ASHRAE 15 (latest edi­tion). Contact Carrier for further information on use of this chiller
with other refrigerants.

DO NOTATTEMPTTO REMOVE fittings, covers,etc., while chiller
is under pressure or while chiller is running. Be sure pressure is at
0 psig (0 kPa) before breaking any refrigerant connection.

CAREFULLY INSPECT all relief devices, rupture discs, and other
relief devices AT LEAST ONCE A YEAR. If chiller operates in a
corrosive atmosphere, inspect the devices at more frequent
intervals.

DO NOT ATTEMPT TO REPAIR OR RECONDITION any relief
device when corrosion or build-up of foreign material (rust, dirt,
scale, etc.) is found within the valve body or mechanism. Replace
the device.

DO NOT install relief devices in series or backwards.
USE CARE when working near or in line with a compressed spring.

Sudden release of the spring can cause it and objects in its path to
act as projectiles.

DO NOT STEP on refrigerant lines. Broken lines can whip about
and release refrigerant, causing personal injury.

DO NOT climb over a chiller. Use platform, catwalk, or staging.
Follow safe practices when using ladders.

USE MECHANICAL EQUIPMENT (crane, hoist, etc.) to lift or
move inspection covers or other heavy components. Even if com­ponents are light, use mechanical equipment when there is a risk of
slipping or losing your balance.

BE AWARE that certain automatic start arrangements CAN EN­GAGE THE STARTER,TOWER FAN,OR PUMPS. Open the dis­connect ahead of the starter, tower fans, or pumps.

USE only repair or replacement parts that meet the code require­ments of the original equipment.

DO NOTVENT OR DRAIN waterboxes containingindustrial brines,
liquid, gases, or semisolids without the permission of your process
control group.

DO NOT LOOSEN waterbox cover bolts until the waterbox has
been completely drained.

DOUBLE-CHECK that coupling nut wrenches, dial indicators, or
other items have been removed before rotating any shafts.

DO NOT LOOSEN a packing gland nut before checking that the
nut has a positive thread engagement.

PERIODICALLY INSPECT all valves, fittings, and piping for cor­rosion, rust, leaks, or damage.

PROVIDE A DRAIN connection in the vent line near each pres­sure relief device to prevent a build-up of condensate or rain
water.

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

Book 2
Tab 5a

PC 211 Catalog No. 531-977 Printed in U.S.A. Form 19XRT-2SS Pg 1 11-98 Replaces: New

CONTENTS

Page

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

INTRODUCTION ..............................4

ABBREVIATIONS AND EXPLANATIONS .......4

CHILLER FAMILIARIZATION .................5-7

Chiller Information Plate ......................5

System Components .........................5

Cooler .......................................5

Condenser ...................................5

Motor-Compressor ...........................5

Turbine ......................................5

Control Panel ................................5

Factory-Mounted Starter (Optional) ............7

Storage Vessel (Optional) .....................7

REFRIGERATION CYCLE .....................7

MOTOR AND LUBRICATING OIL

COOLING CYCLE ..........................7

LUBRICATION CYCLE .......................7-9

Summary ....................................7

Details ......................................7

Oil Reclaim System ..........................9

• PRIMARY OIL RECOVERY MODE

• SECONDARY OIL RECOVERY MODE

STARTING EQUIPMENT ....................10,11

Unit-Mounted Solid-State Starter (Optional) ...10

Unit-Mounted Wye-Delta Starter (Optional) ....11

CONTROLS ...............................11-44

Definitions ..................................11

• ANALOG SIGNAL

• DISCRETE SIGNAL

General .....................................11

PIC II System Components ..................11

• CHILLER VISUAL CONTROLLER (CVC)

• INTEGRATED STARTER MODULE (ISM)

• CHILLER CONTROL MODULE (CCM)

• OIL HEATER CONTACTOR (1C)

• OIL PUMP CONTACTOR (2C)

• HOT GAS BYPASS CONTACTOR RELAY (3C)
(Optional)

• CONTROL TRANSFORMERS (T1, T2)

CVC Operation and Menus ..................15

• GENERAL

• ALARMS AND ALERTS

• CVC MENU ITEMS

• BASIC CVC OPERATIONS (Using the Softkeys)

• TO VIEW STATUS

• OVERRIDE OPERATIONS

• TIME SCHEDULE OPERATION

• TO VIEW AND CHANGE SET POINTS

• SERVICE OPERATION

PIC II System Functions .....................33

• CAPACITY CONTROL

• ECW CONTROL OPTION

• CONTROL POINT DEADBAND

• PROPORTIONAL BANDS AND GAIN

• CHILLER TIMERS

• OCCUPANCY SCHEDULE

Safety Controls .............................34

Shunt Trip (Option) ..........................36

Default Screen Freeze .......................36

Ramp Loading ..............................36

Page

Capacity Override ...........................36

High Discharge Temperature Control .........36

Oil Sump Temperature Control ...............36

Oil Cooler ..................................37

Remote Start/Stop Controls ..................37

Spare Safety Inputs .........................37

Spare Safety Alarm Contacts ................37

Refrigerant Leak Detector ...................37

Condenser Pump Control ....................37

Condenser Freeze Prevention ................38

Tower-Fan Relay Low and High ..............38

Auto. Restart After Power Failure ............38

Water/Brine Reset ...........................38

• RESET TYPE 1

• RESET TYPE 2

• RESET TYPE 3

Demand Limit Control Option ................39

Surge Prevention Algorithm .................39

Surge Protection ............................40

Lead/Lag Control ...........................40

• COMMON POINT SENSOR INSTALLATION

• CHILLER COMMUNICATION WIRING

• LEAD/LAG OPERATION

• FAULTED CHILLER OPERATION

• LOAD BALANCING

• AUTO. RESTART AFTER POWER FAILURE

Ice Build Control ............................42

• ICE BUILD INITIATION

• START-UP/RECYCLE OPERATION

• TEMPERATURE CONTROL DURING ICE BUILD

• TERMINATION OF ICE BUILD

• RETURN TO NON-ICE BUILD OPERATIONS

Attach to Network Device Control ............43

• ATTACHING TO OTHER CCN MODULES

Service Operation ...........................44

• TO ACCESS THE SERVICE SCREENS

• TO LOG OUT OF NETWORK DEVICE

• HOLIDAY SCHEDULING

START-UP/SHUTDOWN/RECYCLE

SEQUENCE .............................45,46

Local Start-Up ..............................45

Shutdown Sequence ........................46

Automatic Soft Stop Amps Threshold .... ....46

Chilled Water Recycle Mode .................46

Safety Shutdown ............................46

BEFORE INITIAL START-UP ................47-59

Job Data Required ..........................47

Equipment Required ........................47

Using the Optional Storage Tank

and Pumpout System .....................47

Remove Shipping Packaging ................47

Open Oil Circuit Valves ......................47

Tighten All Gasketed Joints and

Guide Vane Shaft Packing ................47

Check Chiller Tightness .....................47

Refrigerant Tracer ...........................47

Leak Test Chiller ............................49

Standing Vacuum Test ......................49

Chiller Dehydration .........................52

Inspect Water Piping ........................52

Check Optional Pumpout Compressor

Water Piping ..............................52

Check Relief Valves .........................52

Inspect Wiring ..............................52

2

CONTENTS (cont)

Page

Carrier Comfort Network Interface ...........53

Check Starter ...............................53

• MECHANICAL STARTER

• BENSHAW, INC. REDISTART MICRO
SOLID-STATE STARTER

Oil Charge ..................................54

Power Up the Controls and

Check the Oil Heater ......................54

• SOFTWARE VERSION

Software Configuration ......................54

Input the Design Set Points ..................54

Input the Local Occupied Schedule

(OCCPC01S) ..............................54

Input Service Configurations ................54

• PASSWORD

• INPUT TIME AND DATE

• CHANGE CVC CONFIGURATION IF NECESSARY

• TO CHANGE THE PASSWORD

• TO CHANGE THE CVC DISPLAY FROM ENGLISH
TO METRIC UNITS

• MODIFY CONTROLLER IDENTIFICATION
IF NECESSARY

• INPUT EQUIPMENT SERVICE PARAMETERS IF
NECESSARY

• MODIFY EQUIPMENT CONFIGURATION
IF NECESSARY

Perform A Control Test ......................57

• COOLER AND CONDENSER PRESSURE
TRANSDUCER AND WATERSIDE FLOW
DEVICE CALIBRATION

Check Optional Pumpout System

Controls and Compressor .................57

High Altitude Locations .....................57

Charge Refrigerant Into Chiller ...............58

• CHILLER EQUALIZATION WITHOUT

PUMPOUT UNIT

• CHILLER EQUALIZATION WITH

PUMPOUT UNIT

• TRIMMING REFRIGERANT CHARGE

INITIAL START-UP .........................59,60

Preparation .................................59

Dry Run to Test Start-Up Sequence ..........59

Check Motor Rotation .......................59

• IF THE MOTOR ROTATION IS CLOCKWISE

• IF THE MOTOR ROTATION IS NOT CLOCKWISE

Check Oil Pressure and Compressor Stop ....60

To Prevent Accidental Start-Up ..............60

Check Chiller Operating Condition ...........60

Instruct the Customer Operator ..............60

• COOLER-CONDENSER

• OPTIONAL STORAGE TANK AND

PUMPOUT SYSTEM

• MOTOR COMPRESSOR ASSEMBLY

• MOTOR COMPRESSOR LUBRICATION SYSTEM

• CONTROL SYSTEM

• AUXILIARY EQUIPMENT

• DESCRIBE CHILLER CYCLES

• REVIEW MAINTENANCE

• SAFETY DEVICES AND PROCEDURES

• CHECK OPERATOR KNOWLEDGE

• REVIEW THE START-UP, OPERATION,

AND MAINTENANCE MANUAL

OPERATING INSTRUCTIONS ...............60-62

Operator Duties .............................60

Prepare the Chiller for Start-Up ..............60

To Start the Chiller ..........................60

Check the Running System ..................60

To Stop the Chiller ..........................61

After Limited Shutdown .....................61

Page

Preparation for Extended Shutdown ..........61

After Extended Shutdown ...................61

Cold Weather Operation .....................61

Manual Guide Vane Operation ...............61

Refrigeration Log ...........................61

PUMPOUT AND REFRIGERANT TRANSFER

PROCEDURES ..........................63-65

Preparation .................................63

Operating the Optional Pumpout

Unit ......................................63

• TO READ REFRIGERANT PRESSURES

Chillers with Storage Tanks ..................64

• TRANSFER REFRIGERANT FROM PUMPOUT

STORAGE TANK TO CHILLER

• TRANSFER THE REFRIGERANT FROM

CHILLER TO PUMPOUT STORAGE TANK

Chillers with Isolation Valves ................65

• TRANSFER ALL REFRIGERANT TO CHILLER

CONDENSER VESSEL

• TRANSFER ALL REFRIGERANT TO CHILLER

COOLER VESSEL

• RETURN REFRIGERANT TO NORMAL

OPERATING CONDITIONS

GENERAL MAINTENANCE .................66,67

Refrigerant Properties .......................66

Adding Refrigerant ..........................66

Removing Refrigerant .......................66

Adjusting the Refrigerant Charge ............66

Refrigerant Leak Testing ....................66

Leak Rate ..................................66

Test After Service, Repair, or Major Leak .....66

• REFRIGERANT TRACER

• TO PRESSURIZE WITH DRY NITROGEN

Repair the Leak, Retest, and Apply

Standing Vacuum Test ....................66

Checking Guide Vane Linkage ...............66

Trim Refrigerant Charge .....................66

WEEKLY MAINTENANCE ....................67

Check the Lubrication System ...............67

SCHEDULED MAINTENANCE ..............67-71

Service Ontime .............................67

Inspect the Control Panel ....................67

Check Safety and Operating Controls

Monthly ..................................67

Changing Oil Filter ..........................67

Oil Specification ............................68

Oil Changes ................................68

• TO CHANGE THE OIL

Refrigerant Filter ............................68

Oil Reclaim Filter ...........................68

Inspect Refrigerant Float System ............68

Inspect Relief Valves and Piping .............68

Turbine Strainer .............................68

Turbine Maintenance ........................68

Compressor Bearing and Gear Maintenance ..68
Inspect the Heat Exchanger Tubes and Flow

Devices ..................................70

• COOLER AND FLOW DEVICES

• CONDENSER AND FLOW DEVICES

Water Leaks ................................70

Water Treatment ............................70

Inspect the Starting Equipment ..............70

Check Pressure Transducers ................70

Optional Pumpout System Maintenance ......70

• OPTIONAL PUMPOUT COMPRESSOR OIL

CHARGE

• OPTIONAL PUMPOUT SAFETY CONTROL

SETTINGS

3

CONTENTS (cont)

Page

Ordering Replacement Chiller Parts ..........71

TROUBLESHOOTING GUIDE ...............71-97

Overview ...................................71

Checking the Display Messages .............71

Checking Temperature Sensors ..............71

• RESISTANCE CHECK

• VOLTAGE DROP

• CHECK SENSOR ACCURACY

• DUAL TEMPERATURE SENSORS

Checking Pressure Transducers .............72

• TRANSDUCER REPLACEMENT

Control Algorithms Checkout Procedure .....72

Control Test ................................72

Control Modules ............................82

• RED LED (Labeled as STAT)

• GREEN LED (Labeled as COM)

Notes on Module Operation ..................82

Page

Chiller Control Module (CCM) ................83

• INPUTS

• OUTPUTS

Integrated Starter Module (ISM) ..............83

• INPUTS

• OUTPUTS

Replacing Defective Processor Modules ......83

• INSTALLATION

Solid-State Starters .........................83

• TESTING SILICON CONTROL RECTIFIERS IN
BENSHAW, INC., SOLID-STATE STARTERS

• SCR REMOVAL/INSTALLATION

Physical Data ...............................85

INDEX ......................................98

INITIAL START-UP CHECKLIST FOR

19XRT HERMETIC CENTRIFUGAL

LIQUID CHILLER .................CL-1 to CL-12

INTRODUCTION

Prior to initial start-up of the 19XRT chiller, those in­volved in the start-up, operation, and maintenance should be
thoroughly familiar with these instructions and other nec­essary job data. This book is outlined to familiarize those
involved in the start-up, operation and maintenance of the
unit with the control system before performing start-up pro­cedures. Procedures in this manual are arranged in the se­quence required for proper chiller start-up and operation.

This unit uses a microprocessor control system. Do not
short or jumper between terminations on circuit boards
or modules. Control or board failure may result.

Be aware of electrostatic discharge (static electricity)
when handling or making contact with circuit boards or
module connections. Always touch a chassis (grounded)
part to dissipate body electrostatic charge before work­ing inside control center.

Use extreme care when handlingtoolsnearcircuitboards
and when connecting or disconnecting terminal plugs.
Circuit boards can be damaged easily. Always hold boards
by the edges, and avoid touching components and
connections.

This equipment uses, and can radiate, radio fre­quency energy. If not installed and used in accordance
with the instruction manual, it may interfere with radio
communications. This equipment has been tested and
found to comply with the limits for a Class A comput­ing device pursuant to Subpart J of Part 15 of FCC Rules,
which are designed to provide reasonable protection against
such interference when operated in a commercial envi­ronment. Operation of this equipment in a residential
area is likely to cause interference, in which case the
user, at his own expense, will be required to take
whatever measures may be required to correct the
interference.

Always store and transport replacement or defective
boards in an anti-static shipping bag.

ABBREVIATIONS AND EXPLANATIONS

Frequently used abbreviations in this manual include:

CCM — Chiller Control Module
CCN — Carrier Comfort Network
CVC — Chiller Visual Control
CCW — Counterclockwise
CW — Clockwise
ECDW — Entering Condenser Water
ECW — Entering Chilled Water
EMS — Energy Management System
HGBP — Hot Gas Bypass
I/O — Input/Output
ISM — Integrated Starter Module
LCD — Liquid Crystal Display
LCDW — Leaving Condenser Water
LCW — Leaving Chilled Water
LED — Light-Emitting Diode
OLTA — Overload Trip Amps
PIC II — Product Integrated Control II
RLA — Rated Load Amps
SCR — Silicon Controlled Rectifier
SI — International System of Units
TXV — Thermostatic Expansion Valve

W ordsprinted in all capital letters orin italics may be viewed
on the Chiller Visual Control (CVC) (e.g., LOCAL, CCN,
ALARM, etc.).

Words printed in both all capital letters and italics can also
be viewed on the CVC and are parameters (e.g., CONTROL

MODE, COMPRESSOR START RELAY, ICE BUILD
OPTION, etc.) with associated values (e.g., modes, tempera-

tures, percentages, pressures, on, off, etc.).

Words printed in all capital letters and in a box represent
softkeys on the CVC control panel (e.g., ENTER

, INCREASE , QUIT , etc.).

EXIT

Factory-installed additional components are referred to as
options in this manual; factory-supplied but field-installed
additional components are referred to as accessories.

The chiller software part number of the 19XRTunit is lo­cated on the back of the CVC.

,

4

CHILLER FAMILIARIZATION

(Fig. 1 and 2)

Chiller Information Plate —

located on the right side of the chiller control panel.

The information plate is

System Components — The components include the

cooler and condenser heat exchangers in separate vessels,
motor-compressor,turbine, lubrication package, control panel,
and motor starter.All connections from pressure vessels have
external threads to enable each component to be pressure
tested with a threaded pipe cap during factory assembly.

Cooler — This vessel (also known as the evaporator) is

located underneath the compressor. The cooler is main­tained at lower temperature/pressure so evaporating refrig­erant can remove heat from water flowing through its inter­nal tubes.

Condenser — The condenser operates at a higher

temperature/pressure than the cooler and has water flowing
through its internal tubes in order to remove heat from the
refrigerant.

Motor-Compressor — This component maintains sys-

tem temperature and pressure differences and moves the heat­carrying refrigerant from the cooler to the condenser.

Turbine — The turbine serves 2 purposes. First, it acts as

the expansion device to separate condenser pressure from
cooler pressure. Second, using the pressure differential be­tween the cooler and condenser, the turbine converts the
pressure drop to energy and uses this energy to supplement
the compressor motor, thereby reducing the required
horsepower.

Control Panel — The control panel is the user interface

for controlling the chiller. It regulates the chiller’s capacity
as required to maintain proper leaving chilled water tem­perature. The control panel:

• registers cooler, condenser, and lubricating system
pressures

• shows chiller operating condition and alarm shutdown
conditions

• records the total chiller operating hours

• sequences chiller start, stop, and recycle under micro­processor control

• displays status of motor starter

• provides access to other CCN (Carrier Comfort Network)
devices

Fig. 1 — 19XRT Identification

5

11514

3

2

4

6

5

2122

9

10

8

7

20 18

19

1312

11

RIGHT END VIEW

LEGEND

1—Turbine Housing
2—Power Panel
3—Motor Housing
4—Oil Level Sight Glasses
5—Guide Vane Actuator
6—Demistor Vent Line
7—Suction Elbow
8—Chiller Visual Control (CVC)
9—Condenser Pumpout Connection (Hidden)

16

10 — Condenser Relief Valves
11 — Relief Transfer Valve

17

12 — Condenser Pressure Transducer (Hidden)

16

13 — Cooler Relief Valve
14 — Cooler Pressure Transducer (Hidden)
15 — Cooler Pumpout Connection
16 — Cooler/Condenser Waterflow Device

Condenser In/Out Temperature

17 —

Thermistors

18 — Cooler In/Out Temperature Thermistors
19 — Chiller Identification Nameplate

Location

20 — Float Chamber

17

21 — Refrigerant Charging Valve
22 — Oil Drain Charging Valve

24

23 2625

31

30

27

23 — Take-Apart, Connector (Upper)
24 — Waterbox Vent Connection (Typical)
25 — Cooler Liquid Return Line
26 — Oil Filter Access Cover
27 — Refrigerant Oil Cooler
28 — Take-Apart, Rabbet-Fit Connector

(Lower)

29 — Cooler Return-End Waterbox Cover
30 — Waterbox Drain Port (Typical)
31 — Condenser Return-End Waterbox Cover

29

28

LEGEND

LEFT END VIEW

2

1

12

3

4

5

6

7

1—Turbine Suction
2—Nozzle (Typical, 1 of 6 Shown)
3—Nozzle Block
4—High Efficiency Motor
5—Transmission
6—Compressor Base
7—Guide Vane Actuator
8—Oil Filter Housing

9—Turbine Wheel
10 — Turbine Housing
11 — Turbine Discharge
12 — Turbine Sight Glass

LEGEND

TURBINE COMPONENTS

891011

Fig.2—Typical 19XRT Components

6

Factory-Mounted Starter (Optional)— The starter

allows for the proper start and disconnect of electrical en­ergy for the compressor-motor, oil pump, oil heater,and con­trol panel.

Storage Vessel (Optional) — There are 2 sizes of

storage vessels available. The vessels have double relief valves,
a magnetically-coupled dial-type refrigerant level gage, a
one-inch FPT drain valve, and a1⁄2-in. male flare vapor
connection for the pumpout unit.

NOTE: If a storage vessel is not used at the jobsite, factory­installed isolation valves on the chiller may be used to iso­late the chiller charge in either the cooler or condenser.
An optional pumpout system is used to transfer refrigerant
from vessel to vessel.

REFRIGERATION CYCLE

The compressor continuously draws refrigerant vapor from
the cooler, at a rate set by the amount of guide vane opening
(Fig. 3). As the compressor suction reduces the pressure in
the cooler, the remaining refrigerant boils at a fairly low tem­perature (typically 38 to 42 F [3 to 6 C]). The energy re­quired for boiling is obtained from the water flowing through
the cooler tubes. With heat energy removed, the water be­comes cold enough for use in an air conditioning circuit or
process liquid cooling.

After taking heat from the water, the refrigerant vapor is
compressed. Compression adds still more heat energy and
the refrigerant is quite warm (typically 98 to 102 F
[37 to 40 C]) when it is discharged from the compressor into
the condenser.

Relatively cool (typically 65 to 90 F [18 to 32 C]) water
flowing through the condenser tubes removes heat from the
refrigerant, and the vapor condenses to a liquid. Further re­moval of heat from the refrigerant occurs in the lower cham­ber of the condenser, which is called the sensible subcooler.
At this point, the liquid refrigerant is subcooled by contact
with the coolest (entering water) condenser tubes.

After leaving the sensible subcooler section of the con­denser, the liquid refrigerant enters the float valve chamber.
The main float valve maintains a liquid level in the sub­cooler to prevent hot gas bypass from the condenser to the
cooler at part load conditions. A second valve in the float
valve chamber opens at part load conditions when the liquid
level increases in the condenser to bypass liquid from the
float chamber directly to the cooler inlet. The liquid refrig­erant from the main float valve then flows into the turbine
housing chamber on the compressor. The liquid refrigerant
passes through the turbine nozzles and impacts the turbine
blades where energy is reclaimed as the refrigerant expands
through the turbine to the lower cooler pressure. The turbine
wheel is attached to the motor shaft which allows the turbine
to supplement and reduce motor power requirements.At this
point the refrigerant flashes to a mixture of gas and liquid
which removes heat from the remaining liquid. This mixture
flows back to the cooler where it is now at the same tem­perature and pressure at which the cycle began.

MOTOR AND LUBRICATING OIL

COOLING CYCLE

The motor and the lubricating oil are cooled by liquid re­frigerant taken from the bottom of the condenser vessel
(Fig. 3). Refrigerant flow is maintained by the pressure

differentialthat exists due to compressor operation.After the
refrigerant flows past an isolation valve, an in-line
filter, and a sight glass/moisture indicator, the flow is split
between the motor cooling and oil cooling systems.

Flow to the motor cooling system passes through an ori­fice and into the motor. Once past the orifice, the refrigerant
is directed over the motor by a spray nozzle. The refrigerant
collects in the bottom of the motor casing and is then drained
back into the cooler through the motor refrigerant drain line.
The refrigerant outlet from the motor casing is sized to act
as an orifice to maintain a higher pressure in the motor shell
than in the cooler/oil sump. The motor is protected by a tem­perature sensor imbedded in the stator windings. An in­crease in motor winding temperature past the motor override
set point overrides the temperature capacity control to hold,
and if the motor temperature rises 10° F (5.5° C) above this
set point, closes the inlet guide vanes. If the temperature rises
above the safety limit, the compressor shuts down.

Refrigerant that flows to the oil cooling system is regu­lated by thermostatic expansion valves (TXVs). The TXVs
regulate flow into the oil/refrigerant plate and frame-type heat
exchanger (the oil cooler in Fig. 3). The expansion valve
bulbs control oil temperature to the bearings. The refrigerant
leaving the oil cooler heat exchanger then returns to the chiller
cooler.

LUBRICATION CYCLE

Summary —

up a package located partially in the transmission casting of
the compressor-motor-turbine assembly. The oil is pumped
into a filter assembly to remove foreign particles and is then
forced into an oil cooler heat exchanger where the oil is cooled
to proper operational temperatures. After the oil cooler, part
of the flow is directed to the gears and the high speed shaft
bearings; the remaining flow is directed to the motor shaft
bearings. Oil drains into the transmission oil sump to com­plete the cycle (Fig. 4).

The oil pump, oil filter, and oil cooler make

Details— Oil is charged into the lubrication system through

a hand valve. Two sight glasses in the oil reservoir permit oil
level observation. Normal oil level is between the middle of
the upper sight glass and the top of the lower sight glass
when the compressor is shut down. The oil level should be
visible in at least one of the 2 sight glasses during operation.
Oil sump temperature is displayed on the CVC (Chiller
Visual Control) default screen. During compressor opera­tion, the oil sump temperature ranges between 125 to 150 F
(52 to 66 C).

The oil pump suction is fed from the oil reservoir. An
oil pressure relief valve maintains 18 to 25 psid (124 to
172 kPad) differential pressure in the system at the pump
discharge.This differentialpressure can be read directly from
the CVC default screen. The oil pump discharges oil to the
oil filter assembly. This filter can be closed to permit
removal of the filter without draining the entire oil system
(see Maintenance sections, pages 66-71, for details). The oil
is then piped to the oil cooler heat exchanger. The oil cooler
uses refrigerant from the condenser as the coolant. The re­frigerant cools the oil to a temperature between 120 and
140 F (49 to 60 C).

7

LEGEND

Fig. 3 — Refrigerant, Motor Cooling, and Oil Cooling Cycles

1—Condenser Tubes

2—Filter/Drier

3—Moisture Indicator

4—Refrigerant Cooling Isolation Valves

5—Main Condenser Liquid Drain Line

6—Float Chamber Vent

7—Subcooler

8—Discharge Isolation Valve (Optional)

Charging Valve

9—High Condenser Level Drain

10 — Condenser Side Refrigerant

11 — Stator

12 — Transmission

13 — Diffuser

14 — Impeller

15 — Inlet Guide Vanes

16 — Cooler Distribution Pipe

17 — Refrigerant Cooling Drain Lines

18 — Oil Pump

19 — Oil Filter

20 — Rotor

21 — Oil Cooler

22 — Orificed Fitting

Oil Cooling

23 — Thermal Expansion Valve for

24 — Cooler Refrigerant Supply Line

25 — Turbine Suction Line Strainer

26 — Cooler Suction Line

27 — Cooler Refrigerant Charging

Valve

28 — Turbine Bypass Line Isolation

8

Valve

29 — Turbine Bypass Line

Bypass

30 — Pilot Drain Line From Turbine

31 — Float Chamber

32 — Turbine Float Valve

33 — Turbine Bypass Float Valve

34 — Turbine Suction Isolation Valve

(Optional)

35 — Motor Back Pressure Orifice

OIL
SUPPLY
LINE

THERMAL
EXPANSION
VALVE BULB

THRUST

FILTER
ISOLATION
VALVE

FILTER
OIL DRAIN

OIL SUPPLY
PRESSURE
TRANSDUCER

ISOLATION
VALVE

OIL
COOLER

OIL PUMP
AND MOTOR

Fig. 4 — Lubrication System

JOURNAL
BEARINGS

OIL
CHARGE
VALVE

OIL PRESSURE
RELIEF VALVE

THRUST

REAR PINION
BEARING

SIGHT
GLASSES

STRAINER
CHECK

VALVE
ISOLATION

VALVE
SIGHT

GLASS
FILTER

STRAINEREDUCTOR

ISOLATION
VALVE

COOLER
OIL
RECLAIM
LINE

As the oil leaves the oil cooler, it passes the oil pressure
transducer and the thermal bulb for the refrigerant expan­sion valve on the oil cooler. The oil is then divided. Part of
the oil flows to the thrust bearing, forward pinion bearing,
and gear spray. The rest of the oil lubricates the motor shaft
bearings and the rear pinion bearing. The oil temperature is
measured in the bearing housing as it leaves the thrust and
forward journal bearings. The oil then drains into the oil res­ervoir at the base of the compressor. The PIC II (Product
Integrated Control II) measures the temperature of the oil in
the sump and maintains the temperature during shutdown
(see Oil Sump Temperature Control section, page 36). This
temperature is read on the CVC default screen.

During the chiller start-up, the PIC IIenergizesthe oil pump
and provides 45 seconds of prelubrication to the bearings
after pressure is verified before starting the compressor.
During shutdown, the oil pump will run for 60 seconds to
post-lubricate after the compressor shuts down. The oil pump
can also be energized for testing purposes during a Control
Test.

Ramp loading can slow the rate of guide vane opening to
minimize oil foaming at start-up. If the guide vanes open
quickly, the sudden drop in suction pressure can cause any
refrigerant in the oil to flash. The resulting oil foam can­not be pumped efficiently; therefore, oil pressure falls off
and lubrication is poor. If oil pressure falls below 15 psid
(103 kPad) differential, the PIC II will shut down the
compressor.

If the controls are subject to a power failure that lasts more
than 3 hours, the oil pump will be energized periodically when
the power is restored. This helps to eliminate refrigerant that
has migrated to the oil sump during the power failure. The
controls energize the pump for 60 seconds every 30 minutes
until the chiller is started.

Oil Reclaim System — The oil reclaim system re-

turns oil lost from the compressor housing back to the oil
reservoir by recovering the oil from 2 areas on the chiller.
The guide vane housing is the primary area of recovery. Oil
is also recovered by skimming it from the operating refrig­erant level in the cooler vessel.

PRIMARY OIL RECOVERY MODE — Oil is normally
recovered through the guide vane housing on the chiller.This
is possible because oil is normally entrained with refrigerant
in the chiller.As the compressor pulls the refrigerant up from
the cooler into the guide vane housing to be compressed, the
oil normally drops out at this point and falls to the bottom
of the guide vane housing where it accumulates. Using dis­charge gas pressure to power an eductor, the oil is drawn
from the housing and is discharged into the oil reservoir.

SECONDARYOIL RECOVERYMODE — The secondary
method of oil recovery is significant under light load con­ditions, when the refrigerant going up to the compressor suc­tion does not have enough velocity in which to bring oil along.
Under these conditions, oil collects in a greater concentra­tion at the top level of the refrigerant in the cooler. This oil
and refrigerant mixture is skimmed from the side of the cooler
and is then drawn up to the guide vane housing. There is a
filter in this line. Because the guide vane housing pressure
is much lower than the cooler pressure, the refrigerant boils
off, leaving the oil behind to be collected by the primary oil
recovery method.

9

STARTING EQUIPMENT

The 19XRT requires a motor starter to operate the cen­trifugal hermetic compressor motor, the oil pump, and vari­ous auxiliary equipment. The starter is the main field wiring
interface for the contractor.

See Carrier Specification Z-415 for specific starter re­quirements. All starters must meet these specifications in
order to properly start and satisfy mechanical safety require­ments. Starters may be supplied as separate, free-standing
units or may be mounted directly on the chiller (unit mounted)
for low-voltage units only.

Three separate circuit breakers are inside the starter. Cir­cuit breaker CB1 is the compressor motor circuit breaker.
The disconnect switch on the starter front cover is connected
to this breaker. Circuit breaker CB1 supplies power to the
compressor motor.

The main circuit breaker (CB1) on the front of the starter
disconnects the main motor current only. Power is still
energized for the other circuits. Two more circuit break­ers inside the starter must be turned off to disconnect
power to the oil pump, PIC II controls, and oil heater.

Circuit breaker CB2 supplies power to the control panel,
oil heater, and portions of the starter controls.

Circuit breaker CB3 supplies power to the oil pump. Both
CB2 and CB3 are wired in parallel with CB1 so that power
is supplied to them if the CB1 disconnect is open.

All starters must include a Carrier control module called
the Integrated Starter Module (ISM), excluding the
Benshaw solid-state starters. This module controls and moni­tors all aspects of the starter. See the Controls section on
page 11 for additional ISM information. All starter replace­ment parts are supplied by the starter manufacturer exclud­ing the ISM (contact Carrier’s Replacement Component
Division [RCD]).

Unit-Mounted Solid-State Starter (Optional)

The 19XRT chiller may be equipped with a solid-state,

—

reduced-voltage starter (Fig. 5 and 6). This starter’s primary
function is to provide on-off control of the compressor mo­tor. This type of starter reduces the peak starting torque,
reduces the motor inrush current, and decreases mechanical
shock. This capability is summed up by the phrase ‘‘soft start­ing.’’ The solid-state starter is available as a 19XRT option
(factory supplied and installed). The solid-state starters manu­facturer name is located inside the starter access door.

A solid-state, reduced-voltage starter operates by reduc­ing the starting voltage. The starting torque of a motor at full
voltage is typically 125% to 175% of the running torque.
When the voltage and the current are reduced at start-up, the
starting torque is reduced as well. The object is to reduce the
starting voltage to just the voltage necessary to develop the
torque required to get the motor moving. The voltage is re­duced by silicon controlled rectifiers (SCRs). The voltage
and current are then ramped up in a desired period of time.
Once full voltage is reached, a bypass contactor is energized
to bypass the SCRs.

When voltage is supplied to the solid-state circuitry, the
heat sinks in the starter as well as the wires leading to
the motor and the motor terminal are at line voltage.
Do not touch the heat sinks, power wiring, or motor
terminals while voltage is present or serious injury will
result.

There is a display on the front of the Benshaw,Inc., solid­state starters that is useful for troubleshooting and starter check­out. The display indicates:

• voltage to the SCRs

• SCR control voltage

• power indication

• proper phasing for rotation

• start circuit energized

• over-temperature

• ground fault

• current unbalance

• run state

• software configuration

The starter is further explained in the Check Starter and
Troubleshooting Guide sections, pages 53 and 71.

6

1

2

5

4

LEGEND

1—Ready-Start Micro Input/Output Card
2—Circuit Breaker 2 (CB2):

Machine Control and Heater Power

3—Circuit Breaker 3 (CB3): Oil Pump Power
4—Ready-Start Micro Central Processing Unit Card (CPU)
5—Restart Micro Power Card (hidden, not depicted)
6—Restart Micro Bypass Card (hidden, not depicted)

3

Fig. 5 — Solid-State Starter Box,

Internal View

10

Fig.6—Typical Starter External View

(Solid-State Starter Shown)

Unit-Mounted Wye-Delta Starter (Optional)

The 19XRT chiller may be equipped with a wye-delta

—

starter mounted on the unit. This starter is intended for use
with low-voltage motors (under 600 v). It reduces the start­ing current inrush by connecting each phase of the motor
windings into a wye configuration. This occurs during the
starting period when the motor is accelerating up to speed.
Once the motor is up to speed, the starter automatically con­nects the phase windings into a delta configuration. Starter
control, monitoring, and motor protection is provided by
Carrier’s Integrated Starter Module (ISM).

CONTROLS

Definitions

ANALOG SIGNAL — An analog signal varies in propor­tion to the monitored source. It quantifies values between
operating limits. (Example: A temperature sensor is an ana­log device because its resistance changes in proportion to
the temperature, generating many values.)

DISCRETE SIGNAL — A discrete signal is a 2-position rep­resentation of the value of a monitored source. (Example: A
switch produces a discrete signal indicating whether a value
is above or below a set point or boundary by generating an
on/off, high/low, or open/closed signal.)

General— The 19XRThermetic centrifugal liquid chiller

contains a microprocessor-based control center that moni­tors and controls all operations of the chiller (see Fig. 7).
The microprocessor control system matches the cooling
capacity of the chiller to the cooling load while providing
state-of-the-art chiller protection. The system controls cool­ing load within the set point plus the deadband by sensing
the leaving chilled water or brine temperature and regula­ting the inlet guide vane via a mechanically-linked actuator
motor. The guide vane is a variable flow pre-whirl assem­bly that controls the refrigeration effect in the cooler by
regulating the amount of refrigerant vapor flow into the com­pressor.An increase in guide vane opening increases capac­ity.Adecrease in guide vane opening decreases capacity.The
microprocessor-based control center protects the chiller by
monitoring the digital and analog inputs and executing
capacity overrides or safety shutdowns, if required.

PIC II System Components — The chiller control

system is called PIC II (Product Integrated Control II).
See Table 1. The PIC II controls the operation of the chiller
by monitoring all operating conditions. The PIC II can di­agnose a problem and let the operator know what the prob­lem is and what to check. It promptly positions the guide
vanes to maintain leaving chilled water temperature. It can
interface with auxiliary equipment such as pumps and cool­ing tower fans to turn them on when required. It continually
checks all safeties to prevent any unsafe operating condi­tion. It also regulates the oil heater while the compressor is
off and regulates the hot gas bypass valve, if installed. The
PIC II controls provide critical protection for the compres­sor motor and controls the motor starter.

The PIC II can interface with the Carrier Comfort Net­work (CCN) if desired. It can communicate with other
PIC I or PIC II equipped chillers and other CCN devices.

The PIC II consists of 3 modules housed inside 3 major
components. The component names and corresponding con­trol voltages are listed below (also see Table 1):

• control panel

— all extra low-voltage wiring (24 v or less)

• power panel

— 230 or 115 v control voltage (per job requirement)
— up to 600 v for oil pump power

• starter cabinet

— chiller power wiring (per job requirement)

Table 1 — Major PIC II Components and

Chiller Visual Controller (CVC) and Display Control Panel
Integrated Starter Module (ISM) Starter Cabinet
Chiller Control Module (CCM) Control Panel
Oil Heater Contactor (1C) Power Panel
Oil Pump Contactor (2C) Power Panel
Hot Gas Bypass Relay (3C) (Optional) Power Panel
Control Transformers (T1, T2) Power Panel
Temperature Sensors See Fig. 7.
Pressure Transducers See Fig. 7.

*See Fig. 5 and Fig. 7-11.

CHILLER VISUAL CONTROLLER (CVC) — The CVC is
the ‘‘brain’’ of the PIC II. This module contains all the op­erating software needed to control the chiller. The CVC is
mounted to the control panel (Fig. 10) and is the input center
for all local chiller set points, schedules, configurable
functions, and options. The CVC has a stop button, an alarm
light, four buttons for logic inputs, and a backlight display.
The backlight will automatically turn off after 15 minutes of
non-use. The functions of the four buttons or ‘‘softkeys’’ are
menu driven and are shown on the display directly above
the softkeys.

The viewing angle of the CVC can be adjusted for opti­mum viewing. Remove the 2 bolts connecting the control
panel to the brackets attached to the cooler. Place them in
one of the holes to pivot the control panel forward to back­ward to change the viewing angle. See Fig. 10. To change
the contrast of the display, access the adjustment on the back
of the CVC. See Fig. 10.

Panel Locations*

PIC II COMPONENT

PANEL

LOCATION

11

TOP VIEW

LEGEND

1—Condenser Temperature Sensor Connection
2—Condenser Pressure Transducer Connection

COMPRESSOR AREA

Fig. 7 — 19XRT Control and Sensor Locations

12

INTEGRATED STARTER MODULE (ISM) — This mod­ule is located in the starter cabinet. This module initiates com­mands from the CVC for starter functions such as starting
and stopping the compressor, condenser, chilled water pumps,
tower fan, spare alarm contacts, and the shunt trip. The ISM
monitors starter inputs such as line voltage, motor current,
ground fault, remote start contact, spare safety, condenser
high pressure, oil pump interlock, starter 1M, and run con­tacts. The ISM contains logic capable of safety shutdown. It
shuts down the chiller if communications with the CVC
are lost.

CHILLER CONTROL MODULE (CCM) — This module
is located in the control panel. The CCM provides the input
and outputs necessary to control the chiller. This module moni­tors refrigerant pressure, entering and leaving water tem­peratures, and outputs control for the guide vane actuator,
oil heaters, and oil pump. The CCM is the connection point
for optional demand limit, chilled water reset, remote tem­perature reset, and refrigerant leak sensor.

OIL HEATER CONTACTOR (1C) — This contactor is lo­cated in the power panel (Fig. 11) and operates the heater at
either 115 or 230 v. It is controlled by the PIC II to maintain
oil temperature during chiller shutdown.

OIL PUMP CONTACTOR (2C) — This contactor is located
in the power panel. It operates all 200 to 575-v oil pumps.
The PIC II energizes the contactor to turn on the oil pump
as necessary.

HOT GAS BYPASS CONTACTOR RELAY (3C) (Op­tional) — This relay, located in the power panel, controls the
opening of the hot gas bypass valve. The PIC II energizes
the relay during low load, high lift conditions.

CONTROL TRANSFORMERS (T1, T2) — These trans­formers convert incoming control voltage to 24 vac power
for the 3 power panel contactor relays, CCM, and CVC.

Fig. 8 — Control Sensors (Temperature)

Fig. 9 — Control Sensors

(Pressure Transducers, Typical)

13

Fig. 10 — Control Panel

Fig. 11 — Power Panel

14

CVC Operation and Menus (Fig. 12-18)

GENERAL

• The CVC display automatically reverts to the default screen
after 15 minutes if no softkey activity takes place and if
the chiller is not in the pumpdown mode (Fig. 12).

• If a screen other than the default screen is displayed on the
CVC, the name of that screen is in the upper right corner
(Fig. 13).

• The CVC may be set to display either English or SI units.
Use the CVC configuration screen (accessed from the Serv­ice menu) to change the units. See the Service Operation
section, page 44.

• Local Operation — The PIC II can be placed in local
operating mode by pressing the LOCAL
PIC II then accepts commands from the CVC only and

uses the Local Time Schedule to determine chiller start
and stop times.

• CCN Operation — The PIC II can be placed in the CCN
operating mode by pressing the CCN
PIC II then accepts modifications from any CCN interface

or module (with the proper authority), as well as from the
CVC. The PIC II uses the CCN time schedule to deter­mine start and stop times.

ALARMSANDALERTS — An alarm shuts down the com­pressor. An alert does not shut down the compressor, but it
notifies the operator that an unusual condition has occurred.
An alarm (*) or alert (!) is indicated on the STATUS screens
on the far right field of the CVC display screen.

Alarms are indicated when the control center alarm light
(!) flashes. The primary alarm message is displayed on the
default screen. An additional, secondary message and
troubleshooting information are sent to the ALARM HIS­TORY table.

When an alarm is detected, the CVC default screen will
freeze (stop updating) at the time of alarm. The freeze en­ables the operator to view the chiller conditions at the time
of alarm. The STATUS tables will show the updated infor­mation. Once all alarms have been cleared (by pressing the

RESET

softkey), the default CVC screen will return to nor-

mal operation.
CVC MENU ITEMS — To perform any of the operations

described below, the PIC II must be powered up and have
successfully completed its self test. The self test takes place
automatically, after power-up.

Press the MENU

tures: STATUS

SERVICE

.

softkey to view the list of menu struc-

, SCHEDULE , SETPOINT , and

• The STATUS menu allows viewing and limited calibra-

tion or modification of control points and sensors, relays
and contacts, and the options board.

• The SCHEDULE menu allows viewing and modification

of the local and CCN time schedules and Ice Build time
schedules.

• The SETPOINT menu allows set point adjustments, such

as the entering chilled water and leaving chilled water set
points.

softkey. The

softkey. The

PRIMARY STATUS
MESSAGE

SECONDARY
STA TUS
MESSAGE

ALARM LIGHT
(ILLUMINATED
WHEN POWER ON)

BLINKS CONTINUOUSLY

•

ON FOR AN ALARM
BLINKS ONCE TO

•

CONFIRM A STOP

STOP BUTTON

HOLD FOR ONE

•

SECOND TO STOP

COMPRESSOR
ONTIME

RUNNING TEMP CONTROL
LEAVING CHILLED WATER

CHW IN CHW OUT EVAP REF

55.1 44.1 40.7

CDW IN CDW OUT COND REF

85.0 95.0 98.1

OIL PRESS OIL TEMP AMPS %

21.8 132.9 93

CCN LOCAL RESET MENU

SOFT KEYS

EACH KEY'S FUNCTION IS
DEFINED BY THE MENU DESCRIPTION
ON MENU LINE ABOVE

DATE TIME

01-01-95 11:48

28.8 HOURS

MENU
LINE

Fig. 12 — CVC Default Screen

19XRT_II

ALARM HISTORY

CONTROL TEST
CONTROL ALGORITHM STATUS
EQUIPMENT CONFIGURATION
ISM (STARTER) CONFIGURATION DATA
EQUIPMENT SERVICE
TIME AND DATE
ATTACH TO NETWORK DEVICE
LOG OUT OF DEVICE
CVC CONFIGURATION

SERVICE

Fig. 13 — CVC Service Screen

• The SERVICE menu can be used to view or modify
information on the Alarm History, Control Test, Control
Algorithm Status, Equipment Configuration, ISM Starter
Configuration data, Equipment Service, Time and Date, At­tach to Network Device, Log Out of Network Device, and
CVC Configuration screens.

For more information on the menu structures, refer to

Fig. 15.

Press the softkey that corresponds to the menu structure

to be viewed : STATUS

SERVICE

. To view or change parameters within any of

these menu structures, use the NEXT

, SCHEDULE , SETPOINT ,or

and PREVIOUS soft-

keys to scroll down to the desired item or table. Use the

SELECT

softkey to select that item. The softkey choices

that then appear depend on the selected table or menu. The
softkey choices and their functions are described below.

BASIC CVC OPERA TIONS(Using the Softkeys) — Toper­form any of the operations described below, the PIC II must
be powered up and have successfully completed its self test.

15

• Press QUIT to leave the selected decision or field with­out saving any changes.

• Press ENTER to leave the selected decision or field and
save changes.

• Press NEXT to scroll the cursor bar down in order to
highlight a point or to view more points below the current

screen.

• Press PREVIOUS to scroll the cursor bar up in order to
highlight a point or to view points above the current screen.

2. Press NEXT or PREVIOUS to highlight the desired
status table. The list of tables is:

• MAINSTAT — Overall chiller status

• STAR TUP— Status required to perform startup of chiller

• COMPRESS — Status of sensors related to the

compressor

• HEAT_EX — Status of sensors related to the heat

exchangers

• POWER — Status of motor input power

• ISM_STAT — Status of motor starter

• CVC_PSWD — Service menu password forcing ac-

cess screen

3. Press SELECT to view the desired point status table.

4. On the point status table, press NEXT or

PREVIOUS

until the desired point is displayed on the

screen.

• Press SELECT to view the next screen level (high­lighted with the cursor bar), or to override (if allowable)

the highlighted point value.

• Press EXIT to return to the previous screen level.

• Press INCREASE or DECREASE to change the high­lighted point value.

TO VIEW STATUS (Fig. 14) — The status table shows the
actual value of overall chiller status such as CONTROLMODE,
RUN STATUS, AUTO CHILLED WATER, RESET, and RE­MOTE RESET SENSOR.

1. On the menu screen, press STATUS

to view the list of

point status tables.

19XRT_II MAINSTAT
Control Mode
Run Status
Start Inhibit Timer
Occupied?
System Alert/Alarm
Chiller Start/Stop
Remote Start Contact
Temperature Reset
Control Point
Chilled Water Temp
Active Demand Limit
Average Line Current

POINT STATUS

OFF

Ready

0.0 Min
NO

NORMAL

STOP

Open

0.0 F

44.0 F

44.6 F
100%

0.0%

Fig. 14 — Example of Status Screen

OVERRIDE OPERATIONS
To Override a Value or Status

1. From any point status screen, press NEXT or
PREVIOUS

to highlight the desired value.

16

CCN

LOCAL RESET

MENU

DEFAULT SCREEN

Start Chiller In CCN Control

Start Chiller in Local Control

Clear Alarms

STATUS

SCHEDULE SETPOINT

SERVICE

(SOFTKEYS)

Access Main Menu

List the
Status Tables

Display The Setpoint Table

List the Service Tables

• OCCPC01S – LOCAL TIME SCHEDULE

• OCCPC02S – ICE BUILD TIME SCHEDULE

• OCCPC03S – CCN TIME SCHEDULE

List the Schedules

NEXT

PREVIOUS

SELECT

EXIT

ALARM HISTORY
CONTROL TEST
CONTROL ALGORITHM STA TUS
EQUIPMENT CONFIGURATION
ISM (STARTER) CONFIG DATA
EQUIPMENT SERVICE
TIME AND DATE
ATTACH TO NETWORK DEVICE
LOG OUT OF DEVICE
CVC CONFIGURATION

SEE FIGURE 16

Base Demand Limit

• LCW Setpoint

• ECW Setpoint

• Ice Build Setpoint

• Tower Fan High Setpoint

EXIT

SELECT

PREVIOUS

NEXT

Select a Schedule

1
2
3
4
5
6
7
8

Override

ENABLE DISABLE

EXIT

SELECT

PREVIOUS

NEXT

Select a Time Period/Override

Modify a Schedule Time

ENTER EXIT

INCREASE DECREASE ENTER EXIT

(ANALOG VALUES)

(DISCRETE VALUES)

Add/Eliminate a Day

1

Select a Status Table

NEXT

PREVIOUS

SELECT

EXIT

START

ON

STOP

OFF

RELEASE

ENTER

EXIT

NEXT

PREVIOUS

SELECT

ENTER

ENABLE

DISABLE

QUIT

DECREASE

INCREASE

ENTER

RELEASE

Select a Modification Point

Modify a Discrete Point

Modify an Analog Point

Modify Control Options

• MAINSTAT

• STARTUP

• COMPRESS

• HEAT_EX

• POWER

• ISM_STAT

• CVC_PSWD

Modify the Setpoint

DECREASE

INCREASE

QUIT

ENTER

NEXT

PREVIOUS

SELECT

EXIT

Select the Setpoint

•

(ENTER A 4-DIGIT PASSWORD)

1

1

1

Fig. 15 — 19XRT CVC Menu Structure

17

SERVICE TABLE

NEXT

PREVIOUS

ALARM HISTORY

CONTROL TEST

CONTROL ALGORITHM STA TUS

List the Control Algorithm Status Tables

• CAPACITY (Capacity Control)

• OVERRIDE (Override Status)

• LL_MAINT (Lead Lag Status)

• ISM_HIST (ISM Alarm History)

• LOADSHED

• WSMDEFME (Water System Manager Control Status)

• OCCDEFCM (Time Schedule Status)
Select a Table

NEXT

SELECT

Display Alarm History

(The table holds up to 25 alarms and
alerts with the most recent alarm
at the top of the screen.)

PREVIOUS

EXIT

SELECT

EXIT

List the Control Tests

Select a Test

NEXT

• CCM Thermistors

• CCM Pressure Transducers

• Pumps

• Discrete Outputs

• Guide Vane Actuator

• Diffuser Actuator

• Pumpdown/Lockout

• Terminate Lockout

• Guide Vane Calibration

PREVIOUS

SELECT

EXIT

OCCDEFM (Time Schedule Status)

Data Select Table

NEXT

EQUIPMENT CONFIGURATION List the Equipment Configuration Tables

CONTINUED
ON NEXT PAGE

PREVIOUS

SELECT

OCCPC01S (Local Status)
OCCPC02S (CCN, ICE BUILD Status)
OCCPC03S (CCN Status)

EXIT

Select a Table

NEXT

Select a Parameter

Modify a Parameter

INCREASE

ENABLE

Fig. 16 — 19XRT Service Menu Structure

• CAPACITY (Capacity Control Algorithm)

• OVERRIDE (Override Status)

• LL_MAINT (LEADLAG Status)

• WSMDEFM2 (Water System Manager Control Status)

Maintenance Table Data

• NET_OPT

• BRODEF

• OCCEFCS

• HOLIDAYS

• CONSUME

• RUNTIME

PREVIOUS

DISABLE

SELECT

EXIT

SELECT

QUIT

QUIT

PREVIOUS

NEXT

DECREASE

EXIT

ENTER

ENTER

(ANALOG VALUES)

(DISCRETE VALUES)

18

SERVICE MENU CONTINUED
FROM PREVIOUS PAGE

EQUIPMENT SERVICE

Select a Service Table

NEXT

Select a Service Table Parameter

NEXT

Modify a Service Table Parameter

INCREASE

ENABLE

TIME AND DATE

ATTACH TO NETWORK DEVICE

Select a Device

NEXT

Modify Device Address

INCREASE

• Use to attach CVC to another CCN network or device

• Attach to "LOCAL" to enter this machine

• To upload new tables

PREVIOUS

PREVIOUS

DECREASE

DISABLE

PREVIOUS

DECREASE

ISM (STARTER CONFIG DATA)

Service Tables:

• OPTIONS

• SETUP1

• SETUP2

• LEADLAG

• RAMP_DEM

• TEMP_CTL

SELECT

SELECT

QUIT
QUIT

List Network Devices

• Local

• Device 1

• Device 2

• Device 3

• Device 4 •

• Device 5

• Device 6

• Device 7

• Device 8

• Device 9
Attach T o Any Device

SELECT

ENTER

EXIT

EXIT

ENTER

ENTER

ATTACH

EXIT

(ANALOG VALUES)
(DISCRETE VALUES)

Display Time and Date Table:

• To Modify — Current Time — Day of Week

INCREASE

YES

DECREASE

(ENTER A 4-DIGIT PASSWORD)

4

4

4

4

Service Tables:

• ISM (STARTER) CONFIG PASSWORD

• ISM_CONF

— Current Date — Holiday Today

EXIT

EXIT

NO

ENTER

ENTER

(ANALOG VALUES)

(DISCRETE VALUES)

LOG OUT OF DEVICE

CVC CONFIGURATION

LEGEND

CCN — Carrier Comfort Network
CVC — Chiller Visual Control
IMP — Imperial
ISM — Integrated Starter Module
PIC II — Product Integrated Control II

Default Screen

CCN

CVC Configuration Table

INCREASE

• To Modify — CVC CCN Address

LOCAL

DECREASE

— English (US IMP) or S.I. Metric Units
— Password

RESET

ENTER

• To View — CVC Software Version
(last 2 digits of part number

MENU

EXIT

indicate software version)

Fig. 16 — 19XRT Service Menu Structure (cont)

19

3. Press SELECT to select the highlighted value. Then:

For Discrete Points — Press YES or NO to se-
lect the desired state.

YES NO ENTER EXIT

For Analog Points — Press INCREASE or

DECREASE

to select the desired value.

4. Press ENTER to register the new value.

NOTE: When overriding or changing metric values, it is nec­essary to hold down the softkey for a few seconds in order
to see a value change, especially on kilopascal values.

2. Press NEXT or PREVIOUS to highlight the de­sired schedule.

OCCPC01S — LOCAL Time Schedule
OCCPC02S — ICE BUILD Time Schedule
OCCPC03S — CCN Time Schedule

3. Press SELECT to view the desired time schedule.

4. Press NEXT or PREVIOUS to highlight the de­sired period or override to change.

5. Press SELECT to access the highlighted period or
override.

To Remove an Override

1. On the point status table press NEXT or
PREVIOUS

to highlight the desired value.

2. Press SELECT to access the highlighted value.

3. Press RELEASE to remove the override and return the

point to the PIC II’s automatic control.

Override Indication — An override value is indicated by
‘ ‘SUPVSR,’’‘‘SERVC,’’or ‘‘BEST’’flashing next to the point

value on the STATUS table.

TIME SCHEDULE OPERATION (Fig. 17)

1. On the Menu screen, press SCHEDULE

.

6. a. Press INCREASE or DECREASE to change the
time values. Override values are in one-hour incre-

ments, up to 4 hours.

Fig. 17 — Example of Time Schedule

Operation Screen

20

b. Press ENABLE to select days in the day-of-week

fields. Press DISABLE

to eliminate days from the

period.

7. Press ENTER to register the values and to move
horizontally (left to right) within a period.

8. Press EXIT to leave the period or override.

9. Either return to Step 4 to select another period or
override, or press EXIT

again to leave the current time

schedule screen and save the changes.

2. There are 5 set points on this screen: BASE DEMAND
LIMIT ,LCW SETPOINT (leaving chilled water set point),
ECW SETPOINT (entering chilled water set point), ICE
BUILD SETPOINT, and TOWER FAN HIGH SET­POINT. Only one of the chilled water set points can be
active at one time. The set point that is active is deter­mined from the SERVICE menu. See the Service Opera­tion section, page 44. The ice build (ICE BUILD) func­tion is also activated and configured from the SERVICE
menu.

3. Press NEXT

or PREVIOUS to highlight the desired

set point entry.

4. Press SELECT to modify the highlighted set point.

5. Press INCREASE or DECREASE to change the se­lected set point value.

10. TheHoliday Designation (HOLIDEF table) may be found
in the Service Operation section, page 44. The month,
day, and duration for the holiday must be assigned. The
Broadcast function in the BRODEF table also must be
enabled for holiday periods to function.

TO VIEW AND CHANGE SET POINTS (Fig. 18)

1. To view the SETPOINT table, from the MENU screen

press SETPOINT

.

19XR_II

SETPOINT

Base Demand Limit

Control Point
LCW Setpoint
ECW Setpoint
ICE BUILD Setpoint
Tower Fan High Setpoint

SETPOINT SELECT

100%

50.0 F

60.0 F

40.0 F

85.0 F

6. Press ENTER to save the changes and return to the
previous screen.

SERVICE OPERATION — To view the menu-driven pro­grams available for Service Operation, see Service Opera­tion section, page 44. For examples of CVC display screens,
see Table 2.

Fig. 18 — Example of Set Point Screen

21

Table 2 — CVC Display Data

IMPORTANT: The following notes apply to all Table 2
examples.

1. Only 12 lines of information appear on theCVCscreen at any one
time. Press the NEXT

point or to view items below or above the current screen. Press
the NEXT

PREVIOUS

2. Toaccess the information shown in Examples 9 through 21, enter
your 4-digit password after pressing the SERVICE
no softkeys are pressed for 15 minutes, the CVC automatically

logs off (to prevent unrestricted access to PIC II controls) and re­verts to the default screen. If this happens, you must reenter your
password to access the tables shown in Examples 9 through 21.

3. Termsin the Description column of these tables are listed as they
appear on the CVC screen.

4. The CVC may be configured in English or Metric (SI) units using
the CVC CONFIGURATION screen. See the Service Operation
section, page 44, for instructions on making this change.

5. The items in the Reference Point Name column

the CVC screen

Building Supervisor (BS) software. They are listed in these tables
as a convenience to the operator if it is necessary to cross ref­erenceCCN/BS documentation oruse CCN/BS programs.For more
information, see the 19XRT CCN literature.

softkey twice to page forward; press the

softkey twice to page back.

. They are data or variable names used in CCN or

or PREVIOUS softkey to highlight a

softkey. If

do not appear on

6. Reference Point Names shown in these tables in all capital letters
can beread by CCN andBS software. Of thesecapitalized names,
those preceded by a dagger can also be changed (that is, written
to) by the CCN, BS, and the CVC. Capitalized Reference Point
Names preceded by two asterisks can be changed only from the
CVC. Reference Point Names in lower case type can be viewed
by CCN or BS only by viewing the whole table.

7. Alarms and Alerts:An asterisk

screen

indicates that the chiller is in an alarm state; an exclama­tion point in the far right field of the CVC screen indicates an alert
state. The asterisk (or exclamation point) indicates that the value
on that line has exceeded (or is approaching) a limit. For more
information on alarms and alerts, see the Alarms and Alerts
section, page 15.

12T — Motor Overload
CCN — Carrier Comfort Network
CHW — Chilled Water
CR — Control Relay
CT — Current Transformer
CVC — Chiller Visual Control
ECW — Entering Chilled Water
HGBP — Hot Gas Bypass
ISM — Integrated Starter Module
LCW — Leaving Chilled Water
LRA — Locked Rotor Amps
mA — Milliamps
P—Pressure
SS — Solid State
T—Temperature
VFD — Variable Frequency Drive
WSM — Water System Manager

in the far right field of a CVC status

LEGEND

EXAMPLE 1 — CVC DEFAULT SCREEN

The following data is displayed in the CVC Default screen.

DESCRIPTION RANGE UNITS

(PRIMARY MESSAGE)
(SECONDARY MESSAGE)
(DATE AND TIME)

Compressor Ontime 0-500000.0 HOURS C
Entering Chilled Water −40-245 DEG F ECW CHW IN
Leaving Chilled Water −40-245 DEG F LCW CHW OUT
Evaporator Temperature −40-245 DEG F ERT EVAP REF
Entering Condenser Water −40-245 DEG F ECDW CDW IN
Leaving Condenser Water −40-245 DEG F LCDW CDW OUT
Condenser Temperature −40-245 DEG F CRT COND REF
Oil Pressure 0-420 PSI OILPD OILPRESS
Oil Sump Temp −40-245 DEG F OILT OIL TEMP
Average Line Current 0-999 % AMPS

NOTE: The last three entries are used to indicate operating mode to the PIC II. These values may be forced by the CVC only.

0-1 CCN
0-1 LOCAL
0-1 RESET

REFERENCE POINT NAME

(ALARM HISTORY)

HRS

% AMPS %

DISPLAY

22

Table 2 — CVC Display Data (cont)

EXAMPLE 2 — MAINTSTAT DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Press SELECT

Control Mode NOTE 1 NOTE 1 CMODE
Run Status NOTE 2 NOTE 2 RUNSTAT
Start Inhibit Timer 0-15 min T
Occupied ? 0/1 NO/YES OCC

System Alert/Alarm 0-2 NOTE 3 SYS
*Chiller Start/Stop 0/1 STOP/START CHIL S S
*Remote Start Contact 0/1 OFF/ON REMCON

Temperature Reset −30-30 DEG F T
*Control Point 10-120 DEG F LCW STPT

Chilled Water Temp −40-245 DEG F CHW
*Active Demand Limit 40-100 % DEM LIM

Average Line Current 0-999 % AMPS %

Motor Percent Kilowatts 0-999 % KW

Auto Demand Limit Input 4-20 mA AUTODEM

Auto Chilled Water Reset 4-20 mA AUTORES

Remote Reset Sensor −40-245 DEG F R

Total Compressor Starts 0-99999 C STARTS

Starts in 12 Hours 0-8 STARTS

Compressor Ontime 0-500000.0 HOURS C
*Service Ontime 0-32767 HOURS S HRS

Ice Build Contact 0-1 OPEN/CLOSE ICE

Refrigerant Leak Sensor 0-20 mA REF LEAK

NOTES:

1. Reset, Off, Local, CCN

2. Timeout, Ready, Recycle, Prestart, Start-up, Ramping, Running, Demand, Override, Shutdown, Trippout, Pumpdown, Lockout

3. Normal, Alert, Alarm

4. All variables with capital letter point names are available for CCN read operation. Those shown with (*) support write operations for all CCN
devices.

.

( MAINSTAT will be highlighted).
.

DESCRIPTION STATUS UNITS POINT

START

ALM

RESET

TMP

P

RESET

HRS

CON

EXAMPLE3—STARTUP DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Scroll down to highlight STARTUP

4. Press SELECT

Actual Guide Vane Pos 0-100 % GV

**Chilled Water Pump 0-1 OFF/ON CHWP

Chilled Water Flow 0-1 NO/YES CHW FLOW

**Condenser Water Pump 0-1 OFF/ON CDP

Condenser Water Flow 0-1 NO/YES CDW
Oil Pump Relay 0-1 OFF/ON OILR

**Oil Pump Delta P −6.7-200 ^PSI OILPD

Compressor Start Relay 0-1 OFF/ON CMPR
Compressor Start Contact 0-1 OPEN/CLOSED 1M
Starter Trans Relay 0-1 OFF/ON TRANS

Compressor Run Contact 0-1 OPEN/CLOSED 2M AUX
**Tower Fan Relay Low 0-1 OFF/ON TFR
**Tower Fan Relay High 0-1 OFF/ON TFR HIGH

Starter Fault 0-1 ALARM/NORMAL STARTFLT

Spare Safety Input 0-1 ALARM/NORMAL SAFETY

Shunt Trip Relay 0-1 OFF/ON TRIPR

Starter Fault Status 0-255 ISMFLT

NOTE:All variables with CAPITALLETTER point names are available for CCN read operation. Those shown with (**) shall support write operations
for the CVC only.

.

.

.

.

DESCRIPTION STATUS UNITS POINT

POS

FLOW

AUX

LOW

23

Table 2 — CVC Display Data (cont)

EXAMPLE 4 — COMPRESS DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Scroll down to highlight COMPRESS .

4. Press SELECT

Actual Guide Vane Pos 0-100 % GV
Guide Vane Delta 0-100 % GV DELTA

**Target Guide Vane Pos 0-100 % GV

Oil Sump Temp −40-245 DEG F OILT

**Oil Pump Delta P −6.7-200 PSI OILPD

Comp Discharge Temp −40-245 DEG F CMPD
Comp Thrust Brg Temp −40-245 DEG F MTRB
Comp Motor Winding Temp −40-245 DEG F MTRW
Spare Temperature 1 −40-245 DEG F SPARE
Spare Temperature 2 −40-245 DEG F SPARE T2
Oil Heater Relay 0/1 OFF/ON OILHEAT

Diffuser Actuator 0-100 % DIFF
**Target VFD Speed 0-110 % VFD OUT
**Actual VFD Speed 0-100 % VFD

Surge Protection Counts 0-5 SPC

NOTE:All variables with CAPITALLETTER point names are available for CCN read operation. Those shown with (**) shall support write operations
for the CVC only.

.

.

.

DESCRIPTION STATUS UNITS POINT

POS
TRG

T1

ACT

ACT

EXAMPLE 5 — HEAT

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Scroll down to highlight HEAT

4. Press SELECT

**Chilled Water Delta P −6.7-420 PSI CHWPD

Entering Chilled Water −40-245 DEG F ECW
Leaving Chilled Water −40-245 DEG F LCW
Chilled Water Delta T −6.7-420 ^ F CHW
Chill Water Pulldown/Min −20-20 ^ F CHW
Evaporator Refrig Temp −40-245 DEG F ERT

**Evaporator Pressure −6.7-420 PSI ERP

Evaporator Approach 0-99 ^ F EVAP

**Condenser Water Delta P −6.7-420 PSI CDWPD

Entering Condenser Water −40-245 DEG F ECDW
Leaving Condenser Water −40-245 DEG F LCDW
Condenser Refrig Temp −40-245 DEG F CRT

**Condenser Pressure −6.7-420 PSI CRP

Condenser Approach 0-99 ^ F COND
Hot Gas Bypass Relay 0/1 OFF/ON HGBYPASS
Surge/HGBP Active ? 0/1 NO/YES SHG
Active Delta P 0-200 PSI DP A
Active Delta T 0-200 DEG F DT A
Surge/HGBP Delta T 0-200 DEG F DT

NOTE:All variables with CAPITALLETTER point names are available for CCN read operation. Those shown with (**) shall support write operations
for the CVC only.

.

.

EX .

.

DESCRIPTION STATUS UNITS POINT

EX DISPLAY SCREEN

C

DT
PULL

APP

APP

ACT

24

Table 2 — CVC Display Data (cont)

EXAMPLE 6 — POWER DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Scroll down to highlight POWER .

4. Press SELECT

Average Line Current 0-999 % AMPS
Actual Line Current 0-99999 AMPS AMP A
Average Line Voltage 0-999 % VOLT
Actual Line Voltage 0-99999 VOLTS VOLT A
Power Factor 0.0-1.0 POW FACT
Motor Kilowatts 0-99999 kW KW
Motor Kilowatt-Hours 0-99999 kWH KWH
Demand Kilowatts 0-99999 kWH DEM
Line Current Phase 1 0-99999 AMPS AMPS
Line Current Phase 2 0-99999 AMPS AMPS 2
Line Current Phase 3 0-99999 AMPS AMPS
Line Voltage Phase 1 0-99999 VOLTS VOLT 1
Line Voltage Phase 2 0-99999 VOLTS VOLT 2
Line Voltage Phase 3 0-99999 VOLTS VOLT
Ground Fault Phase 1 0-999 AMPS GF 1
Ground Fault Phase 2 0-999 AMPS GF 2
Ground Fault Phase 3 0-999 AMPS GF
Frequency 0-99 Hz FREQ
12T Sum Heat-Phase 1 0-200 % SUM1HEAT
12T Sum Heat-Phase 2 0-200 % SUM2HEAT
12T Sum Heat-Phase 3 0-200 % SUM3HEAT

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation.

.

.

.

DESCRIPTION STATUS UNITS POINT

%

P

KW

1
3

3

3

EXAMPLE7—ISM

To access this display from the CVC default screen:

1. Press MENU

2. Press STATUS

3. Scroll down to highlight ISM STAT .

4. Press SELECT

ISM Fault Status 0-223 ISMFLT
Single Cycle Dropout 0-1 NORMAL/ALARM CYCLE

Phase Loss 0-1 NORMAL/ALARM PH

Overvoltage 0-1 NORMAL/ALARM OV VOLT

Undervoltage 0-1 NORMAL/ALARM UN VOLT

Current Imbalance 0-1 NORMAL/ALARM AMP
Voltage Imbalance 0-1 NORMAL/ALARM VOLT UNB
Overload Trip 0-1 NORMAL/ALARM OVERLOAD
Locked Rotor Trip 0-1 NORMAL/ALARM LRATRIP
Starter LRA Trip 0-1 NORMAL/ALARM SLRATRIP
Ground Fault 0-1 NORMAL/ALARM GRND

Phase Reversal 0-1 NORMAL/ALARM PH REV
Frequency Out of Range 0-1 NORMAL/ALARM FREQFLT
ISM Power on Reset 0-1 NORMAL/ALARM ISM
Phase 1 Fault 0-1 NORMAL/ALARM PHASE 1

Phase 2 Fault 0-1 NORMAL/ALARM PHASE 2

Phase 3 Fault 0-1 NORMAL/ALARM PHASE

ICR Start Complete 0-1 FALSE/TRUE START OK

1M Start/Run Fault 0-1 NORMAL/ALARM 1M FLT
2M Start/Run Fault 0-1 NORMAL/ALARM 2M
Pressure Trip Contact 0-1 NORMAL/ALARM PRS TRIP

Starter Fault 0-1 NORMAL/ALARM STRT

Motor Amps Not Sensed 0-1 NORMAL/ALARM NO AMPS
Starter Acceleration Fault 0-1 NORMAL/ALARM ACCELFLT
High Motor Amps 0-1 NORMAL/ALARM HIGHAMPS
1CR Stop Complete 0-1 FALSET/TRUE STOP

1M/2M Stop Fault 0-1 NORMAL/ALARM 1M2MSTOP

Motor Amps When Stopped 0-1 NORMAL/ALARM AMPSTOP

Hardware Failure 0-1 NORMAL/ALARM HARDWARE

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation.

.

.

.

DESCRIPTION STATUS UNITS POINT

STAT SCREEN

LOSS

UNB

FLT

POR

FLT

FLT

OK

1

3

25

Table 2 — CVC Display Data (cont)

EXAMPLE 8 — SETPOINT DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SETPOINT

3. Press SELECT

Base Demand Limit

Control Point 40-100 % DLM 100

LCW Set Point 10-120 DEG F lcw
ECW Set Point 15-120 DEG F ecw sp 60.0
Ice Build Set Point 15-60 DEG F ice
Tower Fan High Set Point 55-105 DEG F TFH SP 75

NOTE: All variables are available for CCN read operation; forcing shall not be supported on set point screens.

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight CONTROL ALGORITHM STATUS .

4. Press SELECT

5. Scroll down to highlight CAPACITY

.

(Base Demand Limit will be highlighted).

.

DESCRIPTION STATUS UNITS POINT DEFAULT

sp 50.0

sp 40.0

EXAMPLE 9 — CAPACITY DISPLAY SCREEN

.

.

.

.

DESCRIPTION STATUS UNITS POINT

Entering Chilled Water −40-245 DEG F ECW
Leaving Chilled Water −40-245 DEG F LCW
Capacity Control

Control Point 10-120 DEG F ctrlpt
Control Point Error −99-99 DEG F cperr
ECW Delta T −99-99 DEG F ecwdt
ECW Reset −99-99 DEG F ecwres
LCW Reset −99-99 DEG F lcwres
Total Error + Resets −99-99 DEG F error

Guide Vane Delta −2-2 % gvd
Target Guide Vane Pos 0-100 % GV
Actual Guide Vane Pos 0-100 % GV POS
Target VFD Speed 0-100 % VFD
Actual VFD Speed 0-100 % VFD ACT
VFD Gain 0.1-1.5 VFD CTRL
Demand Inhibit Active 0-1 NO/YES DEM
Amps/kW Ramp 0-100 % DMDLIM

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation; forcing shall not be supported on maintenance
screen.

TRG

OUT

INH

26

Table 2 — CVC Display Data (cont)

EXAMPLE 10 — OVERRIDE DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight CONTROL ALGORITHM STATUS .

4. Press SELECT

5. Scroll down to highlight OVERRIDE

Comp Motor Winding Temp −40-245 DEG F MTRW
Comp Motor Temp Override 150-200 DEG F MT
Condenser Pressure 0-420 PSI CRP
Cond Press Override 90-180 PSI CP OVER
Evaporator Refrig Temp −40-245 DEG F ERT
Evap Ref Override Temp 2-45 DEG F ERT
Comp Discharge Temp −40-245 DEG F CMPD
Comp Discharge Alert 125-200 DEG F CD
Comp Thrust Brg Temp −40-245 DEG F MTRB
Comp Thrust Brg Alert 165-185 DEG F TB ALERT
Actual Superheat −20-99 ^ F SUPRHEAT
Superheat Required 6-99 ^ F SUPR
Condenser Refrig Temp −40-245 DEG F CRT

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation; forcing shall not be supported on maintenance
screens.

.

.

.

.

DESCRIPTION STATUS UNITS POINT

OVER

OVER

ALEERT

REQ

EXAMPLE 11 — LL

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight CONTROL ALGORITHM STATUS .

4. Press SELECT

5. Scroll down to highlight LL

Lead Lag Control

LEAD/LAG: NOTE 1 leadlag
Configuration Current Mode NOTE 2 llmode
Load Balance Option 0/1 DSABLE/ENABLE loadbal

LAG START TIME 2-60 MIN lagstart
LAG STOP TIME 2-60 MIN lagstop
PRESTART FAULT Time 2-30 MIN preflt

Pulldown: Delta T/Min x.xx ^ DEG pull
LEAD CHILLER in Control 0/1 NO/YES leadctrl

LAG CHILLER: Mode NOTE 3 lagmode

STANDBY CHILLER: Mode NOTE 3 stdmode

Spare Temperature 1 −40-245 DEG F SPARE T1
Spare Temperature 2 −40-245 DEG F SPARE

NOTES:

1. DISABLE, LEAD, LAG, STANDBY, INVALID

2. DISABLE, LEAD, LAG, STANDBY, RECOVERY, CONFIG

3. Reset, Off, Local, CCN

4. Timeout, Ready, Recycle, Prestart, Startup Ramping, Running, Demand, Override, Shutdown, Trippout, Pumpdown, Lockout

5. Stop, Start, Retain

6. All variables with CAPITALLETTER point names are available for CCN read operation; forcing shall not be supported on maintenance screens.

.

.

.

MAINT. .

DESCRIPTION STATUS UNITS POINT

Satisfied? 0/1 NO/YES pull

Run Status NOTE 4 lagstat
Start/Stop NOTE 5 lag
Recovery Start Request 0/1 NO/YES lag

Run Status NOTE 4 stdstat
Start/Stop NOTE 5 Std
Recovery Start Request 0/1 NO/YES std rec

MAINT DISPLAY SCREEN

dt
sat

s s
rec

s s

T2

27

Table 2 — CVC Display Data (cont)

EXAMPLE 12 — ISM HIST DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight CONTROL ALGORITHM STATUS .

4. Press SELECT

5. Scroll down to highlight ISM

ISM FAULT HISTORY
Values At Last Fault:
Line Current Phase 1 0-99999 AMPS AMPS
Line Current Phase 2 0-99999 AMPS AMPS
Line Current Phase 3 0-99999 AMPS AMPS H3
Line Voltage Phase 1 0-99999 VOLTS VOLTS H1
Line Voltage Phase 2 0-99999 VOLTS VOLTS
Line Voltage Phase 3 0-99999 VOLTS VOLTS H3
Ground Fault Phase 1 0-999 AMPS GRFT H31
Ground Fault Phase 2 0-999 AMPS GRFT
Ground Fault Phase 3 0-999 AMPS GRFT H12
I2T Sum Heat-Phase 1 0-200 % SUM1HT H
I2T Sum Heat-Phase 2 0-200 % SUM2HT
I2T Sum Heat-Phase 3 0-200 % SUM3HT H
Phase 1 Faulted? 0/1 NO/YES PHASE H1
Phase 2 Faulted? 0/1 NO/YES PHASE
Phase 3 Faulted? 0/1 NO/YES PHASE H3
Line Frequency 0-99 Hz FREQ
ISM Fault Status 0-9999 ISMFLT H

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation; forcing shall not be supported on maintenance
screens.

.

.

.

HIST .

DESCRIPTION STATUS UNITS POINT

H1
H2

H2

H23

H2

H

H

EXAMPLE 13 — WSMDEFME DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight CONTROL ALGORITHM STATUS

4. Press SELECT

5. Scroll down to highlight WSMDEFME

WSM Active? 0/1 NO/YES WSMSTAT
Chilled Water Temp 0.0-99.9 DEG F CHWTEMP

Equipment Status 0/1 OFF/ON CHLRST
Commanded State XXXXXXXX TEXT CHLRENA

CHW setpt Reset Value 0.0-25.0 DEG F CHWRVAL
Current CHW Set Point 0.0-99.9 DEG F CHWSTPT

NOTE: All variables with CAPITAL LETTER point names are available for CCN read operation; forcing shall not be supported on maintenance
screens.

.

.

.

.

.

DESCRIPTION STATUS UNITS POINT

28

Table 2 — CVC Display Data (cont)

EXAMPLE 14 — NET OPT DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight EQUIPMENT CONFIGURATION .

4. Press SELECT

5. Scroll down to highlight NET

Loadshed Function

Group Number 0-99 LDSGRPN 0
Demand Limit Decrease 0-60 % LDSDLTA 20
Maximum Loadshed Time 0-120 MIN MAXSHED 60

CCN Occupancy Config:

Schedule Number 3-99 OCC
Broadcast Option 0-1 DSABLE/ENABLE OCCBRST DSABLE

Alarm Configuration

Re-alarm Time 0-1440 MIN RETIME 30
Alarm Routing 0-1 ROUTING 10000000

NOTE: No variables are available for CCN read or write operation.

.

.

.

OPT .

DESCRIPTION STATUS UNITS POINT DEFAULT

NUM 3

EXAMPLE 15 — ISM

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight ISM (STARTER) CONFIG DATA

4. Press SELECT

5. Scroll down to highlight ISM

Starter Type 0-2 starter 1
(0 = Full, 1 = Red, 2 = SS/VFD)
Motor Rated Line Voltage 200-13200 VOLTS v
Volt Transformer Ratio:1 1-33 vt
Overvoltage Threshold 105-115 % overvolt 115
Undervoltage Threshold 85-95 % undvolt 85
Over/Under Volt Time 1-10 SEC uvuntime 5
Voltage % Imbalance 1-10 % v
Voltage Imbalance Time 1-10 SEC v
Motor Rated Load Amps 10-5000 AMPS a fs 200
Motor Locked Rotor Trip 100-60000 AMPS motor lr 1000
Locked Rotor Start Delay 1-10 cycles lrdelay 5
Starter LRA Rating 100-60000 AMPS start
Motor Current CT Ratio:1 3-1000 ct turns 100
Current % Imbalance 5-40 % c
Current Imbalance Time 1-10 SEC c time 5
3 Grnd Fault CT’s? (1 = No) 0-1 NO/YES gf phase YES
Ground Fault CT Ratio:1 150 gf
Ground Fault Current 1-25 AMPS gf amps 15
Ground Fault Start Delay 1-20 cycles gf
Ground Fault Persistence 1-10 cycles gf pers 5
Single Cycle Dropout 0/1 DSABLE/ENABLE cycdrop DSABLE
Frequency = 60 Hz? (No = 50) 0/1 NO/YES freq YES
Line Frequency Faulting 0/1 DSABLE/ENABLE freq

NOTE: No variables are available for CCN read or write operation.

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CONF .

DESCRIPTION STATUS UNITS POINT DEFAULT

CONF DISPLAY SCREEN

fs 460

rat 1

unbal 10
time 5

lr 2000

unbal 15

ctr 150
delay 10

en DSABLE

29

Table 2 — CVC Display Data (cont)

EXAMPLE 16 — OPTIONS DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight EQUIPMENT SERVICE .

4. Press SELECT

5. Scroll down to highlight OPTIONS

Auto Restart Option 0/1 DSABLE/ENABLE ASTART DSABLE
Remote Contacts Option 0/1 DSABLE/ENABLE MODES DSABLE
Soft Stop Amps Threshold 40-100 % STRTSTOP 100

Surge/Hot Gas Bypass

Surge Limit/HGBP Option 0/1 srg
Select: Surge = 0, HGBP = 1
Min. Load Point (T1/P1)
Surge/HGBP Delta T1 0.5-20 ^ F hgb
Surge/HGBP Delta P1 30-170 PSI hgb
Full Load Point (T2/P2)
Surge/HGBP Delta T2 0.5-20 ^ F hgb dt2 10
Surge/HGBP Delta P2 50-170 PSI hgb
Surge/HGBP Deadband 0.5-3 ^ F hgb db 1

Surge Protection

Surge Delta % Amps 5-20 % surge
Surge Time Period 7-10 MIN surge

Ice Build Control

Ice Build Option 0/1 DSABLE/ENABLE ibopt DSABLE
Ice Build Termination 0-2 ibterm 0
0 = Temp, 1 = Contacts, 2 = Both
Ice Build Recycle 0/1 DSABLE/ENABLE ibrecyc DSABLE

Refrigerant Leak Option 0/1 DSABLE/ENABLE LEAK
Refrigerant Leak Alarm mA 4-20 mA LEAK MA 20

NOTE: No variables are available for CCN read or write operation.

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DESCRIPTION STATUS UNITS POINT DEFAULT

hgbp 0

dt1 1.5
dp1 50

dp2 85

a10
t8

EN DSABLE

EXAMPLE 17 — SETUP1 DISPLAY SCREEN

To access this display from the CVC default screen:

1. Press MENU

2. Press SERVICE

3. Scroll down to highlight EQUIPMENT SERVICE .

4. Press SELECT

5. Scroll down to highlight SETUP1

Comp Motor Temp Override 150-200 DEG F MT
Cond Press Override 90-165 PSI CP OVER 125
Comp Discharge Alert 125-200 DEG F C
Comp Thrust Brg Alert 165-185 DEG F TB ALERT 175

Chilled Medium 0/1 WATER/BRINE MEDIUM WATER
Chilled Water Deadband .5-2.0 ^F CS
Evap Refrig Trippoint 0.0-40.0 DEG F ERT
Refrig Override Delta T 2.0-5.0 ^F REF OVER 3
Condenser Freeze Point −20 - 35 DEG F CDFREEZE 34

Evap Flow Delta P Cutout 0.5 - 50.0 PSI EVAP
Cond Flow Delta P Cutout 0.5 - 50.0 PSI COND CUT 5.0
Water Flow Verify Time 0.5-5 MIN WFLOW
Oil Press Verify Time 15-300 SEC OILPR T40
Recycle Control

Recycle Restart Delta T 2.0-10.0 DEG F RCYCR
Recycle Shutdown Delta 0.5-4.0 DEG F RCYCS DT 1

SPARE ALERT/ALARM ENABLE
Disable=0, Lo=1/3,Hi=2/4

Spare Temp #1 Enable 0.4 sp1
Spare Temp #1 Limit −40-245 DEG F sp1 lim 245
Spare Temp #2 Enable 0-4 sp2
Spare Temp #2 Limit -40-245 DEG F sp2 lim 245

NOTE: No variables are available for CCN read operation; forcing shall not be supported on service screens.

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DESCRIPTION STATUS UNITS POINT DEFAULT

OVER 200

ALERT 200

DB 1.0

TRIP 33

CUT 5.0

T5

DT 5

en 0
en 0

30