Carrier 50GTN, 60GTN, 70GTN, 80GTN, 90GTN Service And Troubleshooting Manual

Controls, Start-Up, Operation,

Service, and Troubleshooting

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can
be hazardous due to system pressures, electrical compo­nents, and equipment location (roof, elevated structures, etc.).
Only trained, qualified installers and servicemechanicsshould
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.

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

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.

To prevent potential damage to heat exchanger tubes al­ways run fluid through heat exchangers when adding or
removing refrigerant charge. Use appropriate brine so­lutions in cooler and condenser fluid loops to prevent
the freezing of heat exchangers when the equipment is
exposed to temperatures below 32 F (0° C).

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, Refrigeration 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.

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.

CONTENTS

Page

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

GENERAL ...................................2

INTRODUCTION ..............................2

MAJOR SYSTEM COMPONENTS ............3-10

General ......................................3

Main Base Board (MBB) ......................3

Expansion Valve (EXV) Board .................3

Compressor Expansion Board (CXB) ..........3

Scrolling Marquee Display ....................3

Energy Management Module (EMM) ...........3

Enable/Off/Remote Contact Switch ............3

Emergency On/Off Switch ....................3

Reset Button ................................3

Board Address ...............................3

Control Module Communication ..............3

Carrier Comfort Network Interface ............3

OPERATING DATA .........................11-46

Sensors ....................................11

• T1 — COOLER LEAVING FLUID SENSOR

• T2 — COOLER ENTERING FLUID SENSOR

• T3,T4 — SATURATED CONDENSING
TEMPERATURE SENSORS

• T5,T6 — COOLER SUCTION TEMPERATURE
SENSORS

• T7,T8 — COMPRESSOR SUCTION GAS
TEMPERATURE SENSORS

• T9 — OUTDOOR-AIR TEMPERATURE SENSOR

• T10 — REMOTE SPACE TEMPERATURE SENSOR

Thermostatic Expansion Valves (TXV) ........15

Compressor Protection Control System

(CPCS) or Control Relay (CR) ..............15

Compressor Current Protection Board

(CGF) and Control Relay (CR) ..............15

Electronic Expansion Valve (EXV) ............16

Energy Management Module .................16

Capacity Control ............................16

• MINUTES LEFT FOR START

• MINUTES OFF TIME

• LOADING SEQUENCE

• LEAD/LAG DETERMINATION

• CAPACITY SEQUENCE DETERMINATION

• CAPACITY CONTROL OVERRIDES

30GTN,GTR040-420

Air-Cooled Reciprocating Liquid Chillers

with

ComfortLink™

Controls

50/60 Hz

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

Book 2
Tab 5c

PC 903 Catalog No. 533-099 Printed in U.S.A. Form 30GTN-1T Pg 1 5-99 Replaces: New

CONTENTS (cont)

Page

Head Pressure Control ......................27

• COMFORTLINK™ UNITS (With EXV)

• UNITS WITH TXV

Pumpout ...................................27

• EXV UNITS

• TXV UNITS

Marquee Display Usage .....................29

Service Test ................................29

Configuring and Operating Dual Chiller

Control ...................................29

Temperature Reset ..........................43

Demand Limit ...............................45

• DEMAND LIMIT (2-Stage Switch Controlled)

• EXTERNALLY POWERED DEMAND LIMIT

(4 to 20 mA Controlled)

• DEMAND LIMIT (CCN Loadshed Controlled)

TROUBLESHOOTING ......................46-51

Compressor Protection Control System

(CPCS) Board .............................46

Compressor Ground Current (CGC) Board

(30GTN,R130-210, 230A-315A, and

330A/B-420A/B) ...........................46

EXV Troubleshooting ........................46

• STEP 1 − CHECK PROCESSOR EXV OUTPUTS

• STEP 2 — CHECK EXV WIRING

• STEP 3 — CHECK RESISTANCE OF EXV MOTOR

WINDINGS

• STEP 4 — CHECK THERMISTORS THAT

CONTROL EXV

• STEP 5 — CHECK OPERATION OF THE EXV

Alarms and Alerts ...........................47

SERVICE ..................................52-64

Electronic Components .....................52

Compressors ...............................52

• COMPRESSOR REMOVAL

• OIL CHARGE

Cooler ......................................52

• COOLER REMOVAL

• REPLACING COOLER

• SERVICING THE COOLER

Condenser Coils ............................55

Condenser Fans ............................55

Refrigerant Feed Components ...............56

• ELECTRONIC EXPANSION VALVE (EXV)

• MOISTURE-LIQUID INDICATOR

• FILTER DRIER

• LIQUID LINE SOLENOID VALVE

• LIQUID LINE SERVICE VALVE

Thermistors ................................57

• LOCATION

• REPLACING THERMISTOR T2

• REPLACING THERMISTORS T1,T5,T6,T7, AND T8

• THERMISTORS T3 AND T4

• THERMISTOR/TEMPERATURE SENSOR CHECK

Safety Devices ..............................63

• COMPRESSOR PROTECTION

• LOW OIL PRESSURE PROTECTION

• CRANKCASE HEATERS

• COOLER PROTECTION

Relief Devices ..............................64

• HIGH-SIDE PROTECTION

• LOW-SIDE PROTECTION

• PRESSURE RELIEF VALVES

Other Safeties ..............................64

PRE-START-UP .............................64

System Check ..............................64

START-UP AND OPERATION ...............65,66

Actual Start-Up .............................65

Page

Operating Limitations .......................65

• TEMPERATURES

• VOLTAGE

• MINIMUM FLUID LOOP VOLUME

• FLOW RATE REQUIREMENTS

Operation Sequence ........................66

APPENDIX A — CCN TABLES ..............67-74

START-UP CHECKLIST ..............CL-1 to CL-8

GENERAL

Unit sizes 230-420 are modular units which are shipped
as separate sections (modules A and B). Installation instruc­tions specific to these units are shipped inside the individual
modules. See Table 1 for a listing of unit sizes and modular
combinations. For modules 230B-315B, follow all general
instructions as noted for unit sizes 080-110. For all remain­ing modules, follow instructions for unit sizes 130-210.

INTRODUCTION

This publication contains Start-Up, Service, Controls, Op­eration, andT roubleshootinginformation for the 30GTN,R040­420 liquid chillers with ComfortLink controls.

The 30GTN,R chillers are equipped with electronic ex­pansion valves (EXVs) or, on size 040-110 FIOP (factory­installed option) units, conventional thermostatic expansion
valves (TXVs). The size 040-110 FIOP chillers are also
equipped with liquid line solenoid valves (LLSV).

NOTE: TXVs are not available on modular units.

Differences in operations and controls between standard
and 040-110 FIOP units are noted in appropriate sections in
this publication. Refer to the Installation Instructions and the
Wiring Diagrams for the appropriate unit for further details.

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 and Modular Combinations

UNIT MODEL

30GTN,R

NOMINAL

TONS

SECTION A

UNIT 30GTN,R

SECTION B

UNIT 30GTN,R

40 40 — —
45 45 — —
50 50 — —
60 60 — —
70 70 — —
80 80 — —
90 90 — —

100 100 — —

110 110 — —
130 125 — —
150 145 — —
170 160 — —
190 180 — —
210 200 — —
230 220 150 080
245 230 150 090
255 240 150 100
270 260 170 100
290 280 190 110
315 300 210 110
330 325 170 170
360 350 190 190/170*
390 380 210 190
420 400 210 210

*60 Hz units/50 Hz units.

2

MAJOR SYSTEM COMPONENTS

General —

The 30GTN,R air-cooled reciprocating chill­ers contain the 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. 1 for typical control
box drawing. See Fig. 2-4 for control schematics.

Main Base Board (MBB) — See Fig. 5. 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 ther­mistors T1-T6, T9, and T10. See Table 2. The MBB also
receives the feedback inputs from compressors A1, A2, B1
and B2, and other status switches. See Table 3. The MBB
also controls several outputs. Relay outputs controlled by the
MBB are shown in Table 4. 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 TB3. See Fig. 5.

Expansion Valve (EXV) Board — The electronic

expansion valve (EXV) board receives inputs from ther­mistors T7 and T8. See Table 2. The EXV board commu­nicates with the MBB and directly controls the expansion
valves to maintain the correct compressor superheat.

CompressorExpansionBoard(CXB) — The com-

pressor expansion board (CXB) receives the feedback in­puts from compressorsA3,B3andA4. See Table3.The CXB
board communicates the status to the MBB and controls the
outputs for these compressors. The CXB board can also be
used as an accessory to control up to two field-installed ac­cessory unloaders on 080-110, 130 (60 Hz), and 230B-315B
sizes.

ScrollingMarquee Display — This device is the key-

pad interface used for accessing chiller information, reading
sensor values, and testing the chiller.The marquee display is
a 4-key, 4-character,16-segment LED (light-emitting diode)
display. Eleven mode LEDs are located on the display as
well as an Alarm Status LED. See Marquee Display Usage
section on page 29 for further details.

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 temperature reset, cooling set point reset 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.

Enable/Off/RemoteContactSwitch — 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 rated for
dry circuit application capable of handlinga5vdc,1to
20 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. 6.

Emergency On/Off Switch — The Emergency On/

Off switch should only be used when it is required to shut
the chiller offimmediately. Power to the MBB, EMM, CXB,
and marquee display is interrupted when this switch is off
and all outputs from these modules will be turned off. The
EXV board is powered separately, but expansion valves will
be closed as a result of the loss of communication with the
MBB. There is no pumpout cycle when this switch is used.
See Fig. 6.

Reset Button — A reset button is located on the fuse/

circuit breaker panel for unit sizes 130-210 and associated
modules. The reset button must be pressed to reset either
Circuit Ground Fault board in the event of a trip.

BoardAddresses— The Main Base Board (MBB) has

a 3-position Instance jumper that must be set to ‘1.’Allother
boards have 4-position DIP switches. All switches are set to
‘On’ for all boards.

Control Module Communication

RED LED — Proper operation of the control boards can be
visually checked by looking at the red status LEDs (light­emitting diodes).Whenoperatingcorrectly, the redstatusLEDs
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 board 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

30GTN,R chiller units can be connected to the CCN if de­sired.Thecommunicationbuswiringis a shielded, 3-conductor
cable with drain wire and is supplied and installed in the
field. 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 atTB3.Consultthe CCN Contractor’sManual
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 byAlpha (2413 or 5463),American(A22503),Belden
(8772), or Columbia (02525) meets the above mentioned
requirements.

3

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 TB3 of the plug,

the white wire to COM terminal, and the black wire to
the (−) terminal.

4. The RJ14 CCN connector on TB3 can also be used, but

is only intended for temporary connection (for example,
a laptop computer running Service Tool).

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 2 — Thermistor Designations

THERMISTOR

NO.

PIN

CONNECTION

POINT

THERMISTOR INPUT

T1 J8-13,14 (MBB) Cooler Leaving Fluid
T2 J8-11,12 (MBB) Cooler Entering Fluid

T3 J8-21,22 (MBB)

Saturated Condensing
Temperature, Ckt A

T4 J8-15,16 (MBB)

Saturated Condensing
Temperature, Ckt B

T5 J8-24,25 (MBB)

Cooler Suction Temperature,
Ckt A (EXV Only)

T6 J8-18,19 (MBB)

Cooler Suction Temperature,
Ckt B (EXV Only)

T7 J5-11,12 (EXV)

Compressor Suction Gas
Temperature, Ckt A (EXV Only)

T8 J5-9,10 (EXV)

Compressor Suction Gas
Temperature, Ckt B (EXV Only)

T9 J8-7,8 (MBB)

Outdoor-Air Temperature Sensor
(Accessory)

T10 J8-5,6 (MBB)

Remote Space Temperature
Sensor (Accessory)

LEGEND

EXV — Electronic Expansion Valve
MBB — Main Base Board

Table 3 — Status Switches

STATUS SWITCH

PIN

CONNECTION

POINT

040-060 (50 Hz)
040-070 (60 Hz)

070

(50 Hz)

080, 230B

090-110,

245B-315B

130

(60 Hz)

130 (50 Hz)

150, 230A-255A

170,190,

270A,290A,330A/B,

360A/B, 390B

210, 315A,

390A, 420A/B

Oil Pressure, Ckt B J7-1, 2 (MBB) Not Used* OPSB OPSB OPSB OPSB OPSB OPSB
Oil Pressure, Ckt A J7-3, 4 (MBB) Not Used* OPSA OPSA OPSA OPSA OPSA OPSA

Remote On/Off TB5-13, 14 Field-Installed Relay Closure

Compressor Fault

Signal, B3

J5-8, 12 (CXB) Not Used Not Used Not Used Not Used Not Used CR-B3 CR-B3

Compressor Fault

Signal, B2

J9-2, 12 (MBB) Not Used Not Used CPCS-B2 CR-B2 CR-B2 CR-B2 CR-B2

Compressor Fault

Signal, B1

J9-8, 12 (MBB) CR/CPCS-B1† CPCS-B1 CPCS-B1 CR-B1 CR-B1 CR-B1 CR-B1

Compressor Fault

Signal, A4

J5-5, 12 (CXB) Not Used Not Used Not Used Not Used Not Used Not Used CR-A4

Compressor Fault

Signal, A3

J5-11, 12 (CXB) Not Used Not Used Not Used Not Used CR-A3 CR-A3 CR-A3

Compressor Fault

Signal, A2

J9-5, 12 (MBB) Not Used CPCS-A2 CPCS-A2 CR-A2 CR-A2 CR-A2 CR-A2

Compressor Fault

Signal, A1

J9-11, 12 (MBB) CR/CPCS-A1† CPCS-A1 CPCS-A1 CR-A1 CR-A1 CR-A1 CR-A1

LEGEND

CPCS — Compressor Protection Control System
CR — Control Relay
CXB — Compressor Expansion Board
MBB — Main Base Board
OPS — Oil Pressure Switch, Circuit A or B

*The OPS can also be added as an accessory.

†The CPCS can be added as an accessory.

4

Table 4 — Output Relay

RELAY NO. DESCRIPTION

K0 (MBB)

Energize Compressor A1 and OFM1 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt A (if used)

(040-110*)

Energize Compressor A1, OFM5, and OFM7 (130-210*)

K1 (MBB)

Energize Compressor B1 and OFM2 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt B (if used)

(040-110*)

Energize Compressor B1, OFM6, and OFM8 (130-210*)

K2 (MBB)

Energize Unloader A1 (040-170*)
No Action (190-210*)

K3 (MBB)

Energize Unloader B1 (040-070†, 080-170*)
No Action (190,210*)

K4 (MBB)

No Action (040-060, 50 Hz; 040-070, 60 Hz)
Energize Compressor A2 (070, 50 Hz; 080-210*)

K5 (MBB)

No Action (040-080*)
Energize Compressor B2 (090-210*)

K6 (MBB) Alarm
K7 (MBB) Cooler Pump

K8 (MBB)

Energize First Stage of Condenser Fans:

040-050 — OFM3
060-110* — OFM3, OFM4
130 (60 Hz) — OFM1,OFM2

Energize First Stage of Ckt A Condenser Fans:

130 (50 Hz), 150,170* — OFM1
190,210* — OFM1,OFM11

K9 (MBB)

Energize First Stage of Condenser Fans:

040-050 — OFM4
060-090* — OFM5, OFM6
100,110* — OFM5,OFM6,OFM7,OFM8
130 (60 Hz) — OFM3,OFM4,OFM9,OFM10

Energize First Stage of Ckt B Condenser Fans:

130 (50 Hz), 150,170* — OFM2
190,210* — OFM2,OFM12

K10 (MBB) Hot Gas Bypass

K1 (CXB)

No Action (040-110*; 130, 60 Hz)
Energize Compressor A3 (130, 50 Hz; 150-210*)

K2 (CXB)

No Action (040-150*)
Energize Compressor B3 (170-210*)

K3 (CXB)

Energize Compressor A4 (210*)
Energize Accessory Unloader A2 (080-110*)

K4 (CXB) Energize Accessory Unloader B2 (080-110*)
K5 (CXB)

Energize Second Stage of Ckt A Condenser Fans:

130 (50 Hz), 150-210* — OFM3,OFM9

K6 (CXB)

Energize Second Stage of Ckt B Condenser Fans:

130 (50 Hz), 150-210* — OFM4,OFM10

LEGEND

OFM — Outdoor-Fan Motor

*And associated modular units.

†Field-installed accessory unloader.

LEGEND FOR FIG. 1-4

C—Compressor Contactor
CB — Circuit Breaker
CCN — Carrier Comfort Network
CGF — Compressor Ground Fault
CHT — Cooler Heater Thermostat
CKT — Circuit
CLHR — Cooler Heater Relay
CPCS — Compressor Protection and Control System
CWF — Chilled Water Flow Switch
CWP — Chilled Water Pump
CR — Control Relay
CXB — Compressor Expansion Board
EQUIP GND — Equipment Ground
FB — Fuse Block
FC — Fan Contactor
FCB — Fan Circuit Breaker
FIOP — Factory-Installed Option Package
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FCB — Fan Circuit Breaker
HPS — High-Pressure Switch
LCS — Loss-of-Charge Switch
MBB — Main Base Board
NEC — National Electrical Code
OAT — Outdoor-Air Temperature
OPS — Oil Pressure Switch
PL — Plug
PW — Part Wind
SN — Sensor (Toroid)
SPT — Space Temperature
TRAN — Transformer
SW — Switch
TB — Terminal Block
TDR — Time Delay Relay
TXV — Thermostatic Expansion Valve
UL — Unloader
XL — Across-the-Line

5

Fig.1—Typical Control Box (080-110 and Associated Modular Units Shown)

6

Fig.2—24VControl Schematic, Unit Sizes 040-070

7

Fig.3—24VControl Schematic, Unit Sizes 080-110, 230B-315B

8

Fig.4—24VControl Schematic, Unit Sizes 130-210, 230A-315A, 330A/B-420A/B

9

CEPL130346-01

STATUS

LEN

J1

J2

J4

J3

J5

J6

J7

J8

J9

J10

CCN

RED LED - STATUS GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

YELLOW LED ­CCN (CARRIER COMFORT NETWORK)

Fig. 5 — Main Base Board

EMERGENCY ON/OFF
SWITCH

ENABLE/OFF/REMOTE
CONTACT SWITCH

RESET BUTTON
(30GTN,R130-210 AND
ASSOCIATED MODULES ONLY)

GFI-CONVENIENCE
OUTLET ACCESSORY
ON 208/230V 460 AND
575V ONLY

Fig. 6 — Enable/Off/Remote Contact Switch, Emergency On/Off Switch,

and Reset Button Locations

10

OPERATING DATA

Sensors —

The electronic control uses 4 to 10 ther­mistors to sense temperatures for controlling chiller opera­tion. See Table 2. These sensors are outlined below. See
Fig.7-10forthermistor locations. Thermistors T1-T9 are
5kVat 25 C (77 F) and are identical in temperature versus
resistance and voltage drop performance. Thermistor T10 is
a10kVat 25 C (77 F) and has a different temperature vs
resistance and voltage drop performance. See Thermistors
section on page 55 for temperature-resistance-voltage drop
characteristics.

T1 — COOLER LEAVING FLUID SENSOR — This ther­mistor is located in the leaving fluid nozzle. The thermistor
probe is inserted into a friction-fit well. The sensor well is
located directly in the refrigerant path.

T2 — COOLER ENTERING FLUID SENSOR — This ther­mistor is located in the cooler shell in the first baffle space
in close proximity to the cooler tube bundle.

T3, T4 — SATURATED CONDENSING TEMPERATURE
SENSORS — These 2 thermistors are clamped to the out­side of a return bend of the condenser coils.

T5, T6 — COOLER SUCTION TEMPERATURE SEN­SORS — These thermistors are located next to the refrig­erant inlet in the cooler head, and are inserted into a friction­fit well. The sensor well is located directly in the refrigerant
path. These thermistors are not used on units with TXVs.

T7, T8 — COMPRESSOR SUCTION GAS TEMPERA­TURE SENSORS — These thermistors are located in the
lead compressor in each circuit in a suction passage after the
refrigerant has passed over the motor and is about to enter
the cylinders. These thermistors are inserted into friction-fit
wells. The sensor wells are located directly in the refrigerant
path. These thermistors are not used on units with TXVs.

T9 — OUTDOOR-AIR TEMPERATURE SENSOR — Sen­sor T9 is an accessory sensor that is remotely mounted and
used for outdoor-air temperature reset.

LEGEND
EXV — Electronic Expansion Valve
*And associated modular units.

Fig. 7 — Cooler Thermistor Locations

040-110*

130-210*

11

040-070

080-110AND ASSOCIATED MODULAR UNITS 130-210 AND ASSOCIATED MODULAR UNITS*

*When thermistor is viewed from perspective where the compressor is on the left and the cooler is on the right.

Fig. 8 — Thermistor T3 and T4 Locations

12

LEGEND

EXV — Electronic Expansion Valve

Fig. 9 — Compressor Thermistor Locations (T7 and T8)

Fig. 10 — Typical Thermistor Location (30GTN,R210, 315A, 390A, 420A/B Shown)

13

T10 — REMOTE SPACE TEMPERATURE SENSOR —
Sensor T10 (part no. HH51BX006) 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 wall-mounted 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). The push button override button is not sup­ported by the ComfortLink™ Controls.

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.TheRJ11 connector is used to tap into the Carrier
Comfort Network (CCN) at the sensor.

To connect the space temperature sensor (Fig. 11):

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 5 and 6

on TB5 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. 12):

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 below for acceptable wiring.

MANUFACTURER

PART NO.

Regular Wiring Plenum Wiring

Alpha 1895 —

American A21451 A48301

Belden 8205 884421

Columbia D6451 —

Manhattan M13402 M64430

Quabik 6130 —

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.)

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.

SPT (T10) PART NO. HH51BX006

SENSOR

SEN

SEN

TB5

5

6

Fig. 11 — Typical Space Temperature

Sensor Wiring

T-55 SPACE
SENSOR

CCN+

CCN GND

CCN-

TO CCN
COMM 1
BUS (PLUG)
AT UNIT

1

2

3

4

5

6

Fig. 12 — CCN Communications Bus Wiring

to Optional Space Sensor RJ11 Connector

14

Thermostatic Expansion Valves (TXV) —

Model 30GTN,R040-110 units are available from the fac­tory with conventional TXVs with liquid line solenoids. The
liquid line solenoid valves are not intended to be a mechani­cal shut-off.When service is required, use the liquid line serv­ice valve to pump down the system.

NOTE: This option is not available for modular units.

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 refrigerantintothecooler.
All TXVs are adjustable, but should not be adjusted unless
absolutely necessary. When TXV is used, thermistors T5,
T6, T7, and T8 are not required.

The TXV is designed to limit the cooler saturated suction
temperature to 55 F (12.8 C). This makes it possible for unit
to start at high cooler fluid temperatures without overload­ing the compressor.

Compressor Protection Control System (CPCS)
or Control Relay (CR) —

Each compressor has its own
CPCS module or CR. See Fig. 13 for CPCS module. The
CPCS or CR is used to control and protect the compressors
and crankcase heaters. The CPCS and CR provide the fol­lowing functions:

• compressor contactor control/crankcase heater

• crankcase heater control

• compressor ground current protection (CPCS only)

• status communication to processor board

• high-pressure protection

One large relay is located on the CPCS board. This relay
controls the crankcase heater and compressor contactor, and
also provides a set of signal contacts that the microprocessor
monitors to determine the operating status of the compres­sor. If the processor board determines that the compressor is
not operating properly through the signal contacts, it will lock
the compressor off by deenergizing the proper 24-v control
relay on the relay board. The CPCS board contains logic that
can detect if the current-to-ground of any compressor wind­ing exceeds 2.5 amps. If this condition occurs, the CPCS
shuts down the compressor.

Ahigh-pressureswitchiswiredinseriesbetweentheMBB
and the CR or CPCS. On compressor A1 and B1 a loss-of­charge switch is also wired in series with the high-pressure
switch. If the high-pressure switch opens during operation
of a compressor, the compressor will be stopped, the failure

will be detected through the signal contacts, and the com­pressor will be locked off. If the lead compressor in either
circuit is shut down by the high-pressure switch, loss-of­charge switch, ground current protector, or oil safety switch,
all compressors in that circuit are shut down.

NOTE: The CR operates the same as the CPCS, except the
ground current circuit protection is not provided.

Compressor Ground Current Protection Board
(CGF) and Control Relay (CR) —

The 30GTN,R130­210, and associated modular units (see Table 1) contain one
compressor ground current protection board (CGF) for each
refrigeration circuit. The CGF contains logic that can detect
if the current-to-ground of any compressor winding exceeds

2.5 amps. If this occurs, the lead compressor in that circuit
is shut down along with other compressors in that circuit.

Ahigh-pressureswitchiswiredinseriesbetweentheMBB
and the CR or CPCS. On compressor A1 and B1 a loss-of­charge switch is also included with the high-pressure switch.
The lead compressor in each circuit also has the CGF con­tacts described above. If any of these switches open during
operation of a compressor, the CR relay is deenergized, stop­ping the compressorandsignalingtheprocessorat the MBB-J9
inputs to lock out the compressor. If the lead compressor in
either circuit is shut down by high-pressure switch, com­pressor ground fault, oil pressure switch, or the loss-of­charge switch, all compressors in that circuit are also shut
down.

Fig. 13 — Compressor Protection Control

System Module

15

Electronic Expansion Valve(EXV) (See Fig. 14)
— Standard units are equipped with a bottom seal EXV .This

device eliminates the use of the liquid line solenoid pump­down at unit shutdown.An O-ring has been added to bottom
of orifice assembly to complete a seal in the valve on shut­down. This is not a mechanical shut-off. When service is re­quired, use the liquid line service valve to pump down the
system.

High pressure refrigerant enters bottom of valve where it
passes through a group of machined slots in side of orifice
assembly.As refrigerant passes through the orifice, it drops
in pressure. To control flow of refrigerant, the sleeve slides
up and down along orifice assembly, modulating the size of
orifice. The sleeve is moved by a linear stepper motor that
moves in increments controlled directly by the processor.As
stepper motor rotates,themotionistranslatedintolinear move­ment of lead screw. There are 1500 discrete steps with this
combination. The valve orifice begins to be exposed at
320 steps. Since there is not a tight seal with the orifice and
the sleeve, the minimum position for operation is 120 steps.

Two thermistors are used to determine suction superheat.
One thermistor is located in the cooler and the other is lo­cated in the cylinder end of the compressor after refrigerant
has passed over the motor. The difference between the
2 thermistors is the suction superheat. These machines are
set up to provide approximately 5 to 7 F (2.8 to 3.9 C) super­heat leaving the cooler. Motor cooling accounts for approxi­mately 22 F (12.2 C), resulting in a superheat entering com­pressor cylindersofapproximately30F (16.7 C). This increases
performance of cooler by reducing the amount of superheat
needed.

Because the valves are controlled by the EXV module, it
is possible to track the position of the valve. Valve position
can be used to control head pressure and system refrigerant
charge.

During initial start-up, the EXV module will drive each
valve fully closed. After initialization period, valve position
is controlled by the EXV module and the MBB.

The EXV is used to limit the maximum cooler saturated
suction temperature to 55 F (12.8 C). This makes it possible
for the chiller to start at high cooler fluid temperatures with­out overloading the compressor.

Energy Management Module (Fig. 15) — This

factory-installed option 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 field-supplied

4 to 20 mA generator)

• Discrete inputs for 2-step demand limit (requires field-

supplied dry contacts capable of handlinga5vdc,1to
20 mA load)

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

mA generator)

• Discrete input for Ice Done switch (requires field-supplied

dry contacts capable of handling a 5 vdc, 1 to 20 mAload)

See Demand Limit and Temperature Reset sections on
pages 43 and 45 for further details.

Capacity Control — The control system cycles com-

pressors, unloaders, and hot gas bypass solenoids 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 temperature

reset or space and outdoor-air temperature reset features. It
can also be reset from an external 4 to 20 mA signal (re­quires Energy Management Module FIOP/accessory).

With the automatic lead-lag feature in the unit, the control
determines randomly which circuit will start first, A or B. At
the first call for cooling, the lead compressor crankcase heater
will be deenergized, a condenser fan will start, and the com­pressor will start unloaded.

NOTE: The automatic lead-lag feature is only operative when
an even number of unloaders is present. The 040-070 units
require an accessory unloader for the lead-lag feature to be
in effect.

If the circuit has been off for 15 minutes, and the unit is
a TXV unit, liquid line solenoid will remain closed during
start-up of each circuit for 15 seconds while the cooler and
suction lines are purged of any liquid refrigerant. For units
with EXVs, the lead compressor will be signaled to start.
The EXV will remain at minimum position for 10 seconds
before it is allowed to modulate.

After the purge period, the EXV will begin to meter the
refrigerant, or the liquid line solenoid will open allowing the
TXV to meter the refrigerant to the cooler. If the off-time is
less than 15 minutes, the EXV will be opened as soon as the
compressor starts.

The EXVswillopengradually to provide a controlledstart-up
to prevent liquid flood-back to the compressor. During start­up, the oil pressure switch is bypassed for 2 minutes to al­low for the transient changes during start-up. As additional
stages of compression are required, the processor control will
add them. See Tables 5A and 5B.

If a circuit is to be stopped, the control will first start to
close the EXV or close the liquid line solenoid valve.

For units with TXVs, the lag compressor(s) will be shut down
and the lead compressor will continue to operate for 10 sec­onds to purge the cooler of any refrigerant.

For units with EXVs, the lag compressor(s) will be shut down
and the lead compressor will continue to run. After the lag
compressor(s) has shut down, the EXV is signaled to close.
The lead compressor will remain on for 10 seconds after the
EXV is closed.

During both algorithms (TXV and EXV), all diagnostic
conditions will be honored. If a safety trip or alarm condi­tion is detected before pumpdown is complete, the circuit
will be shut down.

Fig. 14 — Electronic Expansion Valve (EXV)

16

The capacity routine runs every 30 seconds. The routine
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 2variablestodeterminewhether or not to make any changes
to the current stages of capacity.Thisratiovalueranges 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 the next stage of capacity is an
unloader,thecontroldeener gizes(energizes) an unloader when
the ratio reaches + 60% (−60%). Unloaders are allowed to
cycle faster than compressors, to minimize the number of
starts and stops on each compressor. A delay of 90 seconds
occurs after each capacity step change.

CEBD430351-0396-01C

TEST 1

CEPL130351-01

PWR

TEST 2

J1

J2

J4 J3

J5

J6

J7

LEN

STATUS

RED LED - STATUS

GREEN LED ­LEN (LOCAL EQUIPMENT NETWORK)

Fig. 15 — Energy Management Module

17

Table 5A — Part Load Data Percent Displacement, Standard Units

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B
%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

040 (60 Hz)

1 25 A1* — —
250A1 — —
3 75 A1*, B1 — —
4 100 A1,B1 — —

040 (50 Hz)
045 (60 Hz)

1 24 A1* — —
247A1 — —
3 76 A1*,B1 — —
4 100 A1,B1 — —

045 (50 Hz)
050 (60 Hz)

1 31 A1* — —
244A1 — —
3 87 A1*,B1 — —
4 100 A1,B1 — —

050 (50 Hz)
060 (60 Hz)

1 28 A1* — —
242A1 — —
3 87 A1*,B1 — —
4 100 A1,B1 — —

060 (50 Hz)
070 (60 Hz)

1 33 A1* — —
250A1 — —
3 83 A1*,B1 — —
4 100 A1,B1 — —

070 (50 Hz)

1 19 A1* — —
227A1 — —
3 65 A1*,B1 — —
4 73 A1,B1 — —
5 92 A1*,A2,B1 — —
6 100 A1,A2,B1 — —

080, 230B (60 Hz)

1 22 A1* 30 B1*
234A1 44B1
3 52 A1*,B1* 52 A1*,B1*
4 67 A1*,B1 63 A1,B1*
5 78 A1,B1 78 A1,B1
6 89 A1*,A2,B1 85 A1,A2,B1*
7 100 A1,A2,B1 100 A1,A2,B1

080, 230B (50 Hz)

1 17 A1* 25 B1*
225A1 38B1
3 42 A1*,B1* 42 A1*,B1*
4 54 A1*,B1 50 A1, B1*
5 62 A1,B1 62 A1,B1
6 79 A1*,A2,B1* 79 A1*,A2,B1*
7 92 A1*,A2,B1 88 A1,A2,B1*
8 100 A1,A2,B1 100 A1,A2,B1

090, 245B (60 Hz)

1 18 A1* 18 B1*
227A1 27B1
3 35 A1*,B1* 35 A1*,B1*
4 44 A1*,B1 44 A1,B1
5 53 A1,B1 53 A1,B1
6 56 A1*,A2,B1* 62 A1*,B1*,B2
7 65 A1*,A2,B1 71 A1,B1*,B2
8 74 A1,A2,B1 80 A1,B1,B2

9 82 A1*,A2,B1*,B2 82 A1*,A2,B1*,B2
10 91 A1*,A2,B1,B2 91 A1,A2,B1*,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

090, 245B (50 Hz)

1 14 A1* 14 B1*

221A1 21B1

3 29 A1*,B1* 29 A1*,B1*

4 36 A1*,B1 36 A1,B1*

5 43 A1,B1 43 A1,B1

6 61 A1*,A2,B1* 53 A1*,B1*,B2

7 68 A1*,A2,B1 60 A1,B1*,B2

8 75 A1,A2,B1 67 A1,B1,B2

9 86 A1*,A2,B1*,B2 86 A1*,A2,B1*,B2
10 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

100, 255B,

270B (60 Hz)

1 16 A1* 16 A1*

223A1 23A1

3 31 A1*,B1* 31 A1*,B1*

4 39 A1*,B1 39 A1*,B1

5 46 A1,B1 46 A1,B1

6 58 A1*,A2,B1* 58 A1*,A2,B1*

7 66 A1*,A2,B1 66 A1*,A2,B1

8 73 A1,A2,B1 73 A1,A2,B1

9 85 A1*,A2,B1*,B2 85 A1*,A2,B1*,B2
10 92 A1*,A2,B1,B2 92 A1*,A2,B1,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

18

Table 5A — Part Load Data Percent Displacement, Standard Units (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

100, 255B,

270B (50 Hz)

1 13 A1* 13 B1*
220A1 20B1
3 26 A1*,B1* 26 A1*,B1*
4 33 A1,B1 33 A1,B1
5 40 A1,B1 40 A1,B1
6 57 A1*,A2,B1* 57 A1*,B1*,B2
7 63 A1*,A2,B1 63 A1,B1*,B2
8 70 A1,A2,B1 70 A1,B1,B2

9 87 A1*,A2,B1*,B2 87 A1*,A2,B1*,B2
10 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

110, 290B,

315B (60 Hz)

1 14 A1* 14 B1*

221A1 21B1

3 29 A1*,B1* 29 A1*,B1*

4 36 A1*,B1 36 A1,B1*

5 43 A1,B1 43 A1,B1

6 61 A1*,A2,B1* 53 A1*,B1*,B2

7 68 A1*,A2,B1 60 A1,B1*,B2

8 75 A1,A2,B1 67 A1,B1,B2

9 86 A1*,A2,B1*,B2 86 A1*,A2,B1*,B2
10 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

110, 290B,

315B (50 Hz)

1 17 A1* 17 B1*

225A1 25B1

3 33 A1*,B1* 33 A1*,B1*

4 42 A1*,B1 42 A1,B1*

5 50 A1,B1 50 A1,B1

6 58 A1*,A2,B1* 58 A1*,B1*,B2

7 67 A1*,A2,B1 67 A1,B1*,B2

8 75 A1,A2,B1 75 A1,B1,B2

9 83 A1*,A2,B1*,B2 83 A1*,A2,B1*,B2
10 92 A1*,A2,B1,B2 92 A1,A2,B1*,B2
11 100 A1,A2,B1,B2 100 A1,A2,B1,B2

130 (60 Hz)

1

2

3

4

5

6

7

8

9
10
11

14
21
28
35
42
58
64
71
87
93

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

14
21
28
35
42
58
64
71
87
93

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

130 (50 Hz)

1

2

3

4

5

6

7

8

9
10
11
12
13
14

10
14
26
35
39
44
53
57
69
78
82
87
96

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

16
25
26
31
39
51
56
64
69
74
82
87
91

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

150, 230A, 245A,

255A (60 Hz)

1

2

3

4

5

6

7

8

9
10
11
12
13
14

11
15
29
38
42
44
53
58
71
80
85
86
95

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

18
27
29
33
42
55
60
69
71
75
85
86
91

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

19

Table 5A — Part Load Data Percent Displacement, Standard Units (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

150, 230A, 245A,

255A (50 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14

13
20
26
33
40
46
53
60
66
73
80
86
93

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

13
20
26
33
40
46
53
60
66
73
80
86
93

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

170, 270A,

330A/B (60 Hz)

1

2

3

4

5

6

7

8

9
10
11
12
13
14
15
16
17

11
17
23
28
33
39
45
50
56
61
67
73
78
83
89
95

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

11
17
23
28
33
39
45
50
56
61
67
73
78
83
89
95

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

170, 270A,

330A/B,360B (50 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17

9
14
19
23
28
33
37
42
52
57
61
72
76
81
91
96

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

9
14
19
23
28
38
43
47
52
57
61
72
76
81
91
96

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

190, 290A, 360A/B,

390B (60 Hz)

1
2
3
4
5
6

13
25
41
56
78

100

A1

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1,A2,A3,B1,B2

A1,A2,A3,B1,B2,B3

13
25
41
56
78

100

B1

A1,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

190, 290A, 360A,

390B (50 Hz)

1
2
3
4
5
6

17
33
50
67
83

100

A1

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1,A2,A3,B1,B2

A1,A2,A3,B1,B2,B3

17
33
50
67
83

100

B1

A1,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

210, 315A, 390A,

420A/B (60 Hz)

1
2
3
4
5
6
7

11
25
36
56
67
86

100

A1

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1,A2,A3,B1,B2

A1,A2,A3,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

14
25
44
56
75
86

100

B1

A1,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

210, 315A, 390A,

420A/B (50 Hz)

1
2
3
4
5
6
7

9
26
35
51
67
84

100

A1

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1,A2,A3,B1,B2

A1,A2,A3,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

16
26
42
51
67
84

100

B1

A1,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

20

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B
%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

040 (60 Hz)

1 25 A1* 25 B1*
250A1 50B1
3 75 A1*,B1 75 A1,B1*
4 100 A1,B1 100 A1,B1

040 (50 Hz)
045 (60 Hz)

1 24 A1* 37 B1*
247A1 53B1
3 61 A1*,B1* 61 A1*,B1*
4 76 A1*,B1 84 A1,B1*
5 100 A1,B1 100 A1,B1

045 (50 Hz)
050 (60 Hz)

1 31 A1* 38 B1*
244A1 56B1
3 69 A1*,B1* 69 A1*,B1*
4 87 A1*,B1 82 A1,B1*
5 100 A1,B1 100 A1,B1

050 (50 Hz)
060 (60 Hz)

1 28 A1* 38 B1*
242A1 58B1
3 67 A1*,B1* 67 A1*,B1*
4 87 A1*,B1 80 A1,B1*
5 100 A1,B1 100 A1,B1

060 (50 Hz)
070 (60 Hz)

1 33 A1* 33 B1*
250A1 50B1
3 67 A1*,B1* 66 A1*,B1*
4 83 A1*,B1 83 A1,B1*
5 100 A1,B1 100 A1,B1

070 (50 Hz)

1 19 A1* 31 B1*
227A1 47B1
3 49 A1*,B1* 49 A1*,B1*
4 65 A1*,B1 57 A1,B1*
5 73 A1,B1 73 A1,B1
6 76 A1*,A2,B1* 76 A1*,A2,B1*
7 92 A1*,A2,B1 84 A1,A2,B1*
8 100 A1,A2,B1 100 A1,A2,B1

080, 230B (60 Hz)

1 11 A1† 15 B1†
2 22 A1* 30 B1*
334A1 44B1
4 41 A1†,B1* 48 A1,B1†
5 55 A1†,B1 63 A1,B1*
6 67 A1*,B1 78 A1,B1
7 78 A1,B1 85 A1,A2,B1*
8 89 A1*,A2,B1 100 A1,A2,B1
9 100 A1,A2,B1 — —

080, 230B (50 Hz)

1 8 A1† 13 B1†
2 17 A1* 25 B1*
325A1 38B1
4 33 A1†,B1* 50 A1,B1*
5 46 A1†,B1 62 A1,B1
6 54 A1*,B1 67 A1*,A2,B1†
7 62 A1,B1 75 A1,A2,B1†
8 71 A1†,A2,B1* 88 A1,A2,B1*

9 84 A1†,A2,B1 100 A1,A2,B1
10 92 A1*,A2,B1 — —
11 100 A1,A2,B1 — —

090, 245B (60 Hz)

1 9 A1† 9 B1†

2 18 A1* 18 B1*

327A1 27B1

4 35 A1†,B1 35 A1,B1†

5 44 A1*,B1 44 A1,B1*

6 53 A1,B1 53 A1,B1

7 56 A1†,A2,B1 62 A1,B1†,B2

8 65 A1*,A2,B1 71 A1,B1*,B2

9 74 A1,A2,B1 80 A1,B1,B2
10 82 A1†,A2,B1,B2 82 A1,A2,B1†,B2
11 91 A1*,A2,B1,B2 91 A1,A2,B1*,B2
12 100 A1,A2,B1,B2 100 A1,A2,B1,B2

*Unloaded compressor.
†Two unloaders, both unloaded.

NOTE: These capacity control steps may vary due to lag compressor sequencing.

21

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

090, 245B (50 Hz)

1 7 A1† 7 B1†
2 14 A1* 14 B1*
321A1 21B1
4 29 A1†,B1 29 A1,B1†
5 36 A1*,B1 36 A1,B1*
6 43 A1,B1 43 A1,B1
7 49 A1†,A2,B1† 46 A1*,B1†,B2
8 54 A1†,A2,B1* 53 A1,B1†,B2

9 61 A1†,A2,B1 60 A1,B1*,B2
10 68 A1*,A2,B1 67 A1,B1,B2
11 75 A1,A2,B1 72 A1†,A2,B1†,B2
12 79 A1†,A2,B1*,B2 79 A1*,A2,B1†,B2
13 86 A1†,A2,B1,B2 86 A1,A2,B1†,B2
14 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
15 100 A1,A2,B1,B2 100 A1,A2,B1,B2

100, 255B,

270B (60 Hz)

1 8 A1† 8 B1†

2 16 A1* 16 B1*

323A1 23B1

4 31 A1†,B1 31 A1,B1†

5 39 A1*,B1 39 A1,B1*

6 46 A1,B1 46 A1,B1

7 50 A1†,A2,B1* 50 A1*,B1†,B2

8 58 A1†,A2,B1 58 A1,B1†,B2

9 66 A1*,A2,B1 66 A1,B1*,B2
10 73 A1,A2,B1 73 A1,B1,B2
11 77 A1†,A2,B1*,B2 77 A1*,A2,B1†,B2
12 85 A1†,A2,B1,B2 85 A1,A2,B1†,B2
13 92 A1*,A2,B1,B2 92 A1,A2,B1*,B2
14 100 A1,A2,B1,B2 100 A1,A2,B1,B2

100, 255B,

270B (50 Hz)

1 7 A1† 7 B1†

2 13 A1* 13 B1*

320A1 20B1

4 26 A1†,B1 26 A1,B1†

5 33 A1*,B1 33 A1,B1*

6 40 A1,B1 40 A1,B1

7 43 A1†,A2,B1† 43 A1†,B1†,B2

8 50 A1†,A2,B1* 50 A1*,B1†,B2

9 57 A1†,A2,B1 57 A1,B1†,B2
10 63 A1*,A2,B1 63 A1,B1*,B2
11 70 A1,A2,B1 70 A1,B1,B2
12 74 A1†,A2,B1†,B2 74 A1†,A2,B1†,B2
13 80 A1†,A2,B1*,B2 80 A1*,A2,B1†,B2
14 89 A1†,A2,B1,B2 87 A1,A2,B1†,B2
15 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
16 100 A1,A2,B1,B2 100 A1,A2,B1,B2

110, 290B,

315B (60 Hz)

1 7 A1† 7 B1†

2 14 A1* 14 B1*

321A1 21B1

4 29 A1†,B1 29 A1,B1†

5 36 A1*,B1 36 A1,B1*

6 43 A1,B1 43 A1,B1

7 47 A1†,A2,B1† 46 A1*,B1†,B2

8 54 A1†,A2,B1* 53 A1,B1†,B2

9 61 A1†,A2,B1 60 A1,B1*,B2
10 68 A1*,A2,B1 67 A1,B1,B2
11 75 A1,A2,B1 72 A1†,A2,B1†,B2
12 79 A1†,A2,B1*,B2 79 A1*,A2,B1†,B2
13 86 A1†,A2,B1,B2 86 A1,A2,B1†,B2
14 93 A1*,A2,B1,B2 93 A1,A2,B1*,B2
15 100 A1,A2,B1,B2 100 A1,A2,B1,B2

110, 290B,

315B (50 Hz)

1 8 A1† 8 B1†

2 17 A1* 17 B1*

325A1 25B1

4 33 A1†,B1 33 A1,B1†

5 42 A1*,B1 42 A1,B1*

6 50 A1,B1 50 A1,B1

7 58 A1†,A2,B1 58 A1,B1†,B2

8 67 A1*,A2,B1 67 A1,B1*,B2

9 75 A1,A2,B1 75 A1,B1,B2
10 83 A1†,A2,B1,B2 83 A1,A2,B1†,B2
11 92 A1*,A2,B1,B2 92 A1,A2,B1*,B2
12 100 A1,A2,B1,B2 100 A1,A2,B1,B2

*Unloaded compressor.

†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

22

Table 5B — Part Load Data Percent Displacement, with Accessory Unloaders (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

130 (60 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17

8
14
21
22
28
35
42
44
51
58
64
71
73
80
87
93

100

A1†

A1*

A1

A1†,B1*

A1†,B1
A1*,B1

A1,B1

A1†,A2,B1†

A1†,A2,B1*

A1†,A2,B1

A1,A2,B1

A1,A2,B1
A1†,A2,B1†,B2
A1†,A2,B1*,B2

A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

8
14
21
22
28
35
42
44
51
58
64
71
73
80
87
93

100

B1†

B1*

B1

A1*,B1†

A1,B1†

A1,B1*

A1,B1
A1†,B1†,B2
A1*,B1†,B2

A1,B1†,B2

A1,B1*,B2

A1,B1,B2

A1†,A2,B1†,B2

A1*,A2,B1†,B2

A1,A2,B1†,B2

A1,A2,B1*,B2

A1,A2,B1,B2

130 (50 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

6
10
14
22
31
35
39
40
49
53
57
65
74
78
82
83
91
96

100

A1†

A1*

A1

A1†,B1*

A1†,B1
A1*,B1

A1,B1

A1†,A2,B1*

A1†,A2,B1

A1*,A2,B1

A1,A2,B1

A1†,A2,B1*,B2

A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

A1†,A2,A3,B1*,B2

A1†,A2,A3,B1,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

8
16
25
31
39
43
47
56
64
65
74
82
83
91

100

—
—
—
—

B1†

B1*

B1

A1,B1*

A1,B1

A1*,B1†,B2

A1,B1†,B2

A1,B1*,B2

A1,B1,B2

A1,A2,B1†,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1,A2,A3,B1†,B2

A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

—
—
—
—

150, 230A, 245A,

255A (60 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17

6
11
15
24
33
38
42
49
53
58
66
75
80
85
91
95

100

A1†

A1*

A1

A1†,B1*

A1†,B1
A1*,B1

A1,B1

A1†,A2,B1

A1*,A2,B1

A1,A2,B1

A1†,A2,B1*,B2

A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

A1†,A2,A3,B1,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

9
18
27
33
42
46
51
60
69
75
86
91

100

—
—
—
—

B1†

B1*

B1

A1,B1*

A1,B1

A1*,B1†,B2

A1,B1†,B2

A1,B1*,B2

A1,B1,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

—
—
—
—

150, 230A, 245A,

255A (50 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

6
13
20
26
33
40
46
53
60
66
73
80
86
93

100

A1†

A1

*A1
A1†,B1
A1*,B1

A1,B1
A1†,A2,B1
A1*,A2,B1

A1,A2,B1
A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

A1†,A2,A3,B1,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

6
13
20
26
33
40
46
53
60
66
73
80
86
93

100

B1†
B1*

B1
A1,B1†
A1,B1*

A1,B1

A1,B1†,B2

A1,B1*,B2

A1,B1,B2
A1,A2,B1†,B2
A1,A2,B1*,B2

A1,A2,B1,B2
A1,A2,A3,B1†,B2
A1,A2,A3,B1*,B2

A1,A2,A3,B1,B2

*Unloaded compressor.

†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

23

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

170, 270A,

330A/B (60 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

6
11
17
17
23
28
33
34
39
45
50
51
56
61
67
67
73
78
83
84
89
95

100

A1†
A1*

A1

A1†,B1*

A1†,B1
A1*,B1

A1,B1

A1†,A2,B1*

A1†,A2,B1
A1*,A2,B1

A1,A2,B1

A1†,A2,B1*,B2

A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

A1†,A2,A3,B1*,B2

A1†,A2,A3,B1,B2
A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1†,A2,A3,B1*,B2,B3

A1†,A2,A3,B1,B2,B3
A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

6
11
17
17
23
28
33
34
39
45
50
51
56
61
67
67
73
78
83
84
89
95

100

B1†

B1*

B1

A1*,B1†

A1,B1†

A1,B1*

A1,B1

A1*,B1†,B2

A1,B1†,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1†,B2

A1,A2,B1†,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1†,B2,B3

A1,A2,B1†,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1†,B2,B3

A1,A2,A3,B1†,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

170, 270A,

330A/B, 360B (50 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

5

9
14
14
19
23
28
28
33
37
42
43
48
52
57
61
63
67
72
76
81
82
87
91
96

100

A1†
A1*

A1

A1†,B1*

A1†,B1

A1*,B1

A1,B1

A1†,A2,B1*

A1†,A2,B1
A1*,A2,B1

A1,A2,B1

A1†,A2,B1†,B2

A1†,A2,B1*,B2

A1†,A2,B1,B2
A1*,A2,B1,B2

A1,A2,B1,B2

A1†,A2,A3,B1†,B2

A1†,A2,A3,B1*,B2

A1†,A2,A3,B1,B2
A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1†,A2,A3,B1†,B2,B3

A1†,A2,A3,B1*,B2,B3

A1†,A2,A3,B1,B2,B3
A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

5

9
14
14
19
23
28
29
34
38
43
47
48
52
57
61
63
67
72
76
81
82
87
91
96

100

B1†

B1*

B1

A1*,B1†

A1,B1†

A1,B1*

A1,B1
A1†,B1†,B2
A1*,B1†,B2

A1,B1†,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1†,B2

A1,A2,B1†,B2

A1,A2,B1*,B2

A1,A2,B1,B2
A1†,A2,B1†,B2,B3
A1*,A2,B1†,B2,B3

A1,A2,B1†,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3
A1†,A2,A3,B1†,B2,B3
A1*,A2,A3,B1†,B2,B3

A1,A2,A3,B1†,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B3,B3

190, 290A, 360A/B,

390B (60 Hz)

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17

9
13
18
21
25
33
37
41
49
53
56
71
74
78
93
96

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

9
13
18
21
25
33
37
41
49
53
56
71
74
78
93
96

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

*Unloaded compressor.

†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

24

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)

UNIT

30GTN,GTR

CONTROL

STEPS

LOADING SEQUENCE A LOADING SEQUENCE B

%

Displacement

(Approx)

Compressors

%

Displacement

(Approx)

Compressors

190, 290A, 360A,

390B (50 Hz)

1
2
3
4
5
6
7
8
9

10

11
12
13
14
15
16
17

11
17
22
28
33
39
44
50
55
61
67
72
78
83
89
94

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

11
17
22
28
33
39
44
50
55
61
67
72
78
83
89
94

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

210, 315A, 390A,

420A/B (60 Hz)

1
2
3
4
5
6
7
8
9

10

11
12
13
14
15
16
17
18
19
20

8
11
17
22
25
28
33
36
48
52
56
59
63
67
78
83
86
92
97

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

A1*,A2,A3,A4,B1*,B2,B3

A1*,A2,A3,A4,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

9
14
17
21
25
37
40
44
48
51
56
67
71
75
78
82
86
92
96

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

A1*,A2,A3,A4,B1*,B2,B3

A1,A2,A3,A4,B1*,B2,B3

A1,A2,A3,A4,B1,B2,B3

210, 315A, 390A,

420A/B (50 Hz)

1
2
3
4
5
6
7
8
9

10

11
12
13
14
15
16
17
18
19
20

7

9
17
23
26
27
32
35
43
48
51
59
65
67
75
81
84
92
97

100

A1*

A1

A1*,B1*

A1*,B1

A1,B1

A1*,A2,B1*

A1*,A2,B1

A1,A2,B1

A1*,A2,B1*,B2

A1*,A2,B1,B2

A1,A2,B1,B2

A1*,A2,A3,B1*,B2

A1*,A2,A3,B1,B2

A1,A2,A3,B1,B2

A1*,A2,A3,B1*,B2,B3

A1*,A2,A3,B1,B2,B3

A1,A2,A3,B1,B2,B3

A1*,A2,A3,A4,B1*,B2,B3

A1*,A2,A3,A4,B1,B2,B3

A1,A2,A3,A4,B1,B2,B3

11
16
17
20
26
34
36
42
43
46
51
59
62
67
75
78
84
92
94

100

B1*

B1

A1*,B1*

A1,B1*

A1,B1

A1*,B1*,B2

A1,B1*,B2

A1,B1,B2

A1*,A2,B1*,B2

A1,A2,B1*,B2

A1,A2,B1,B2

A1*,A2,B1*,B2,B3

A1,A2,B1*,B2,B3

A1,A2,B1,B2,B3

A1*,A2,A3,B1*,B2,B3

A1,A2,A3,B1*,B2,B3

A1,A2,A3,B1,B2,B3

A1*,A2,A3,A4,B1*,B2,B3

A1,A2,A3,A4,B1*,B2,B3

A1,A2,A3,A4,B1,B2,B3

*Unloaded compressor.

†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

25

MINUTES LEFT FOR START — This value is displayed
only in the network display tables (i.e., Service Tool,
Comfortworkst) and 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 (DELY, Configuration Mode under
OPT2) — 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. It is also used to delay
compressor restarts after the unit has shut offitsloweststage
of capacity. 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.

LOADING SEQUENCE — The 30GTN,R compressor ef­ficiency is greatest at partial load. Therefore, the following
sequence list applies to capacity control.

1. The next compressor will be started with unloaders en­ergized on both lead compressors.

2. All valid capacity combinations using unloaders will be
used as long as the total capacity is increasing.

LEAD/LAG DETERMINATION (LLCS, Configuration Mode
under OPT2) — This is a configurable choice and is factory
set to be automatic (for sizes 080-420) or Circuit A leading
(for 040-070sizes).For040-070sizes, the value can be changed
to Automatic or Circuit B only if an accessory unloader is
added to compressor B1. For 080-420 sizes, the value can be
changed 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 SEQUENCE DETERMINATION (LOAD, Con­figuration Mode under OPT2) —Thisisconfigurableasequal
circuit loading or staged circuit loading with the default set
at equal. The control determines the order in which the steps
of capacity for each circuit are changed. This control
choice does NOT have any impact on machines with only
2 compressors.

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

Deadband Multiplier — Theuserconfigurable Deadband Mul­tiplier (Z.GN, Configuration Mode under SLCT) has a de­fault 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 16 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.

First Stage Override — 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.

Ramp Loading (CRMP, Configuration Mode under SLCT)
— Limits the rate of change of leaving fluid temperature. If
the unit is in a Cooling mode and configured for Ramp Load­ing, the controlmakes2comparisonsbefore 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 — When the
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.

Low Cooler Suction Temperature — To avoid freezing the
cooler, the control will compare the circuit Cooler Suction
temperature (T5/T6) with a predetermined freeze point. For
water circuits, the freeze point is 34 F (1.1 C). For brine
circuits, the freeze point is 8° F (4.4° C) below the cooling
set point (lower of 2 cooling set points for dual configura­tion). If the cooler suction temperature is below the freeze
point, the unit capacity may not be allowed to increase. If
the Cooler Suction temperature falls 24 to 29° F (13.3 to

16.1° C) below the freeze point minus 2.0 F (1.1 C) for
5 minutes, Mode 7 (Circuit A) or Mode 8 (Circuit B) is ini­tiated and no additional lag compressor stages will be added.
If the Cooler Suction temperature falls 30° F (16.7° C) or
more below the freeze point minus 2.0 F (1.1 C) for 10 min­utes, the circuit will shut down.

Cooler Freeze Protection — The control will try to prevent
shutting the chiller down on a Cooler Freeze Protection alarm
by removing stages of capacity. The control uses the same
freeze point logic as described in the Low Cooler Suction
Temperature section above. If the cooler leaving fluid tem­perature is less than the freeze point plus 2.0 F (1.1 C), the
control will immediately remove one stage of capacity. This
can be repeated once every 30 seconds.

MOP (Maximum Operating Pressure) Override — The
control monitors saturated condensing and suction tempera­ture for each circuit. Based on a maximum operating set point
(saturated suction temperature), the control may lower the
EXV position when system pressures approach the set
parameters.

26

Head Pressure Control

COMFORTLINK™UNITS (With EXV) — The Main Base
Board (MBB) controls the condenser fans to maintain the
lowest condensing temperature possible, and thus the high­est unit efficiency. The fans are controlled by the saturated
condensing temperature set from the factory. The fans can
also be controlled by a combination of the saturated con­densing temperature, EXV position and compressor super­heat. Fan control is a configurable decision and is determined
by the Head Pressure Control Method (HPCM) setting in the
Configuration Mode under the OPT1 sub-mode. For EXV
control (HPCM = 2), when the position of the EXV is fully
open, T3 and T4 are less than 78 F (25.6 C), and superheat
is greater than 40 F (22.2 C), fan stages will be removed.
When the valve is less than 40% open, or T3 and T4 are
greater than 113 F (45 C), fan stages will be added. At each
change of the fan stage, the system will wait one minute to
allow the head pressure to stabilize unless either T3 or T4 is
greater than 125 F (51.6 C), in which case all MBB-controlled
fans will start immediately. This method allows the unit to
run at very low condensing temperatures at part load.

During the first 10 minutes after circuit start-up, MBB­controlled fans are not turned on until T3 and T4 are greater
than the head pressure set point plus 10 F (5.6 C). If T3 and
T4 are greater than 95 F (35 C) just prior to circuit start-up,
all MBB-controlled fan stages are turned on to prevent ex­cessive discharge pressure during pull-down. Fan sequences
are shown in Fig. 17.

UNITS WITH TXV — The logic to cycle MBB-controlled
fans is based on saturated condensing temperature only, as
sensed by thermistors T3 and T4 (see Fig. 8 and 10). When
either T3 or T4 exceeds the head pressure set point, the MBB
will turn on an additional stage of fans. For the first 10 min­utes of each circuit operation, the head pressure set point is
raised by 10° F (5.6° C). It will turn off a fan stage when T3
and T4 are both below the head pressure set point by 35° F
(19.4° C). At each change of a fan stage the control will wait
for one minute for head pressure to stabilize unless T3 and

T4 is greater than 125 F (51.6 C), in which case all MBB­controlled fans start immediately. If T3 and T4 are greater
than 95 F (35.0 C) just prior to circuit start-up, all MBB­controlled fan stages are turned on to prevent excessive dis­charge pressure during pull-down. Fan sequences are shown
in Fig. 17.

Motormastert Option — For low-ambient operation, the lead
fan(s) in each circuit can be equipped with the Motor­master III head pressure controller option or accessory. Wind
baffles and brackets must be field-fabricated for all units us­ing accessory Motormaster III controls to ensure proper cool­ing cycle operation at low-ambient temperatures. The fans
controlled are those that are energized with the lead com­pressor in each circuit. All sizes use one controller per cir­cuit. Refer to Fig. 17 for condenser fan staging information.

Pumpout

EXV UNITS — When the lead compressor in each circuit
is started or stopped, that circuit goes through a pumpout
cycle to purge the cooler and refrigerant suction lines of
refrigerant. If a circuit is starting within 15 minutes of the
last shutdown, the pumpout cycle will be skipped.

The pumpout cycle starts immediately upon starting the
lead compressor and keeps the EXV at minimum position
for 10 seconds. The EXV is then opened an additional per­centage and compressor superheatcontrolbegins.At this point,
the EXV opens gradually to provide a controlled start-up to
prevent liquid flood-back to the compressor.

At shutdown, the pumpout cycle continuously closes the
EXV until all lag compressors are off and the EXV is at 0%.
The lead compressor continues to run for an additional
10 seconds and is then shut off.

TXV UNITS — Pumpout is based on timed pumpout. On a
command for start-up, the lead compressor starts. After
15 seconds, the liquid line solenoid opens. At shutdown, the
liquid line solenoid closes when the lead compressor has
stopped.

47
46
45
44

43
42
41

0 200 400 600 800 1000

TIME (SECONDS)

2 STARTS

3 STARTS

DEADBAND EXAMPLE

LWT (F)

MODIFIED
DEADBAND

STANDARD
DEADBAND

8

7

6

5

LWT (C)

LEGEND

LWT — Leaving Water

Temperature

Fig. 16 — Deadband Multiplier

27

FAN ARRANGEMENT

FAN

NO.

FAN RELAY NORMAL CONTROL

30GTN,R040-050

1 — Compressor No. A1
2 — Compressor No. B1
3 A1 First Stage of Condenser Fans
4 B1 Second Stage of Condenser Fans

30GTN,R060-090, 230B, 245B

1 — Compressor No. A1

2 — Compressor No. B1
3, 4 A1 First Stage of Condenser Fans
5, 6 B1 Second Stage of Condenser Fans

30GTN,R100,110, 255B-315B

1 — Compressor No. A1

2 — Compressor No. B1
3, 4 A1 First Stage of Condenser Fans

5, 6, 7, 8 B1 Second Stage of Condenser Fans

30GTN,R130 (60 Hz)

POWER

5, 7 — Compressor No. A1
6, 8 — Compressor No. B1
1, 2 A1 First Stage of Condenser Fans

3, 4, 9, 10 B1 Second Stage of Condenser Fans

30GTN,R130 (50 Hz), 150-210,
230A-315A, 330A/B-420A/B†

POWER

5, 7 — Compressor No. A1
6, 8 — Compressor No. B1

1, 11 A1 First Stage of Condenser Fans, Circuit A

3, 9 A2 Second Stage of Condenser Fans, Circuit A

2, 12 B1 First Stage of Condenser Fans, Circuit B
4, 10 B2 Second Stage of Condenser Fans, Circuit B

*Control box.

†Fan numbers 11 and 12 do not apply to 30GT130-170 and associated modular units (see Table 1).

Fig. 17 — Condenser Fan Sequence

28

Marquee Display Usage (See Fig. 18 and
Tables 6-24) —

The Marquee display module provides

the user interface to the ComfortLink™ control system. The
display has up and down arrow keys, an ESCAPE

key,and

an ENTER

key. These keys are used to navigate through
the differentlevelsofthedisplaystructure.SeeTable 6. Press
the ESCAPE

key until the display is blank to move through

the top 11 mode levels indicated by LEDs on the left side of
the display.

Pressing the ESCAPE

and ENTER keys simulta-

neously will scroll a clear language text description across
the display indicating the full meaning of each display ac-

ronym. Pressing the ESCAPE

and ENTER keys when the

display is blank (Mode LED level) will return the Marquee
display to its default menu of rotating display items. In ad­dition, the password will be disabled requiring that it be en­tered again before changes can be made to passwordprotected
items.

Clear language descriptions in English, Spanish, French,
or Portuguese can be displayed when properly configuring
the LANG variable in the Configuration Mode, under DISP
submode. See Table 15.

NOTE: When the LANG variable is changed to 1, 2, or 3,
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 display will flash show­ing the operator, the item, followed by the item value and
then followed by the item units (if any). Press the

ENTER

key to stop the display at the item value. Items in

the Configuration and Service Testmodes are password pro­tected. The display will flash PASS and WORD when re-

quired. Use the ENTER

and arrow keys to enter the 4 dig-

its ofthepassword.The default password is 1111. The password
can only be changed through CCN devices such as
ComfortWorks and Service Tool.

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

Press ENTER

to stop the display at the item value. Press

the ENTER key again so that the item value flashes. Use
the arrow keys to change the value or state of an item and
press the ENTER

key to accept it. Press the ESCAPE key

and the item, value, or units display will resume. Repeat the
process as required for other items.

See Tables 6-24 for further details.

Service Test (See Table 8) — Both main power and

control circuit power must be on.

The Service Test function should be used to verify proper
operation of compressors, unloaders, hot gas bypass (if in­stalled), cooler pump and remote alarm relays, EXVs and
condenser fans. To use the Service Test mode, the Enable/
Off/RemoteContactswitchmustbeinthe OFF position. Use
the display keys and Table 8 to enter the mode and display

TEST. Press ENTER

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 ENTER

. Press

ESCAPE and the button to enter the OUTS or COMP

sub-mode.

Test the condenser fan, cooler pump, and alarm relays by
changing the item values from OFF to ON. These discrete
outputs are turned off if there is no keypad activity for
10 minutes. Use arrow keys to select desired percentage when
testing expansion valves. When testing compressors, the lead
compressor must be started first. All compressor outputs can
be turned on, but the control will limit the rate by staging
one compressor per minute. Compressor unloaders and hot
gas bypass relays/solenoids (if installed) can be tested with
compressors on or off. The relays under the COMP sub­mode will stay on for 10 minutes if there is no keypad ac­tivity. Compressors will stay on until they are turned off by
the operator. The Service Test mode will remain enabled for
as long as there is one or more compressors running. All
safeties are monitored during this test and will turn a com­pressor,circuitorthemachineoff if required. Any other mode
or sub-mode can be accessed, viewed, or changed during the
TEST mode. The MODE item (Run/status mode under sub­mode VIEW) will display ‘‘0’’ as long as the Service mode
is enabled. The TESTsub-mode value must be changed back
to OFF before the chiller can be switched to Enable or Re­mote contact for normal operation.

Configuring and Operating Dual Chiller Con­trol (See Table17) —

The dual chiller routine is avail­able for the control of two units supplying chilled fluid on a
common loop. This control is designed for a parallel fluid
flow arrangement only. One chiller must be configured as
the Master, the other chiller as the Slave. The Master chiller
Leaving Fluid Temperature thermistor (T1) must be in­stalled in the common leaving chilled water line after the
piping has joined from both chillers. See Fig. 19 for ther­mistor location.

To configure the two chillers for operation, follow the ex­ample shown in Table 17. The Master chiller will be con­figured with a slave at address 6. Also in this example, the
Master will be configured to use Lead/Lag Balance to even
out the chiller runtimes weekly.The Lag Start Delay feature
will be set to 10 minutes. The Master and Slave chillers can­not have the same CCN address (CCNA, Configuration mode
under OPT2). Both chillers must have the control method
variable (CTRL, Configuration mode under OPT2) set to ‘3.’
In addition, the chillers must both be connected together on
the same CCN bus. Connections can be made to the CCN
screw terminals on TB3 in both chillers. The Master chiller
will determine which chiller will be Lead and which will be
Lag. The Master controls the Slave by forcing the Slave’s
CHIL_S_S (CCN) variable, control point (CTPT) and de­mand limit.

The Master chiller is now configured for dual chiller op­eration. To configure the Slave chiller, only the LLEN and
MSSL variables need to be set. Enable the Lead/Lag chiller
enable variable (LLEN) as shown Table 17. Similarly, set
the Master/Slave Select variable (MSSL) to SLVE.Thevari­ables LLBL, LLBD, an LLDY are not used by the Slave
chiller.

Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms

Alarm Status

ENTER

MODE

ESCAPE

Fig. 18 — Scrollling Marquee Display

29

Table 6 — Marquee Display Menu Structure)

RUN

STATUS

SERVICE

TEST

TEMPERATURES PRESSURES

SET

POINTS

INPUTS OUTPUTS CONFIGURATION

TIME

CLOCK

OPERATING

MODES

ALARMS

Auto
Display
(VIEW)

Manual

Mode

On/Off

(TEST)

Unit

Temperatures

(UNIT)

Ckt A

Pressures

(PRC.A)

Cooling
(COOL)

Unit

Discrete

(GEN.I)

Unit

Discrete

(GEN.O)

Display

(DISP)

Unit Time

(TIME)

Modes

(MODE)

Current
(CRNT)

Machine

Hours/Starts

(RUN)

Ckt A/B
Outputs
(OUTS)

Ckt A

Temperatures

(CIR.A)

Ckt B

Pressures

(PRC.B)

Head

Pressure

(HEAD)

Ckt A/B

(CRCT)

Ckt A

(CIR.A)

Machine

(UNIT)

Unit Date

(DATE)

Reset

Alarms

(RCRN)

Compressor

Run Hours

(HOUR)

Compressor

Tests

(COMP)

Ckt B

Temperatures

(CIR.B)

Unit

Analog

(4-20)

Ckt B

(CIR.B)

Options 1

(OPT1)

Schedule

(SCHD)

Alarm
History
(HIST)

Compressor

Starts

(STRT)

Options 2

(OPT2)

Reset
History
(RHIS)

Temperature

Reset

(RSET)

Set Point

Select

(SLCT)

LEGEND

Ckt — Circuit

MASTER
CHILLER

SLAVE

CHILLER

LEAVING
FLUID

INSTALL MASTER CHILLER
LEAVING FLUID
THERMISTOR (T1) HERE

RETURN
FLUID

Fig. 19 — Dual Chiller Thermistor Location

30

Table 7 — Run Status Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY ITEM EXPANSION COMMENT

VIEW

ENTER

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

MODE X CONTROL MODE 0 = SERVICE TEST

1 = OFF — LOCAL
2 = OFF — CCN
3 = OFF — TIME
4 = OFF — EMRGCY
5 = ON — LOCAL
6=ON—CCN
7 = ON — TIME

OCC YES/NO OCCUPIED

CAP XXX % PERCENT TOTAL CAPACITY

STGE XX REQUESTED STAGE

ALRM XX CURRENT ALARMS & ALERTS

TIME XX.XX TIME OF DAY 00.0 — 23.59

MNTH XX MONTH OF YEAR 1=JAN,2=FEB, etc.

DATE XX DAY OF MONTH 01 — 31
YEAR XXXX YEAR OF CENTURY

RUN

ENTER

HRS.U XXXX MACHINE OPERATING HOURS
STR.U XXXX MACHINE STARTS

HOUR

ENTER

HRS.A XXXX CIRCUIT A RUN HOURS
HRS.B XXXX CIRCUIT B RUN HOURS
HR.A1 XXXX COMPRESSOR A1 RUN HOURS
HR.A2 XXXX COMPRESSOR A2 RUN HOURS
HR.A3 XXXX COMPRESSOR A3 RUN HOURS
HR.A4 XXXX COMPRESSOR A4 RUN HOURS
HR.B1 XXXX COMPRESSOR B1 RUN HOURS
HR.B2 XXXX COMPRESSOR B2 RUN HOURS
HR.B3 XXXX COMPRESSOR B3 RUN HOURS
HR.B4 XXXX COMPRESSOR B4 RUN HOURS

STRT

ENTER

ST.A1 XXXX COMPRESSOR A1 STARTS
ST.A2 XXXX COMPRESSOR A2 STARTS
ST.A3 XXXX COMPRESSOR A3 STARTS
ST.A4 XXXX COMPRESSOR A4 STARTS
ST.B1 XXXX COMPRESSOR B1 STARTS
ST.B2 XXXX COMPRESSOR B2 STARTS
ST.B3 XXXX COMPRESSOR B3 STARTS
ST.B4 XXXX COMPRESSOR B4 STARTS

31

Table 8 — Service Test Mode and Sub-Mode Directory

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY ITEM EXPANSION COMMENT

TEST

ENTER

ON/OFF SERVICE TEST MODE Use to Enable/Disable Manual Mode

OUTS

ENTER

FR.A1 ON/OFF FAN A1 RELAY Fan 3 (040-050)

Fans 3,4 (060-110, 230B-315B)
Fans 1,2 (130 [60 Hz])
Fan 1 (130 [50 Hz], 150, 170, 230A- 270A,

330A/B, 360B [50 Hz])

Fans 1,11 (190-210, 290A, 315A,

360A, 360B [60 Hz], 390A/B-420A/B)

FR.A2 ON/OFF FAN A2 RELAY Fans 3,9 (130 [50 Hz], 150-210,

230A-315A, 330A/B-420A/B)

EXV.A 0-100% EXV % OPEN

FR.B1 ON/OFF FAN B1 RELAY Fan 4 (040-050)

Fans 5,6 (060-090, 230B-245B)
Fans 5,6,7,8 (100,110, 255B-315B)
Fans 3,4,9,10 (130 [60 Hz])
Fan 2 (130 [50 Hz], 150, 170, 230A- 270A,

330A/B, 360B [50 Hz])

Fans 2,12 (190-210,290A,315A,

360A, 360B [60 Hz] ,390A/B-420A/B)

FR.B2 ON/OFF FAN B2 RELAY Fans 4,10 (130 [50 Hz], 150-210, 230A-315A,

330A/B-420A/B)

EXV.B 0-100% EXV % OPEN
CLR.P ON/OFF COOLER PUMP RELAY
RMT.A ON/OFF REMOTE ALARM RELAY

COMP

ENTER

CC.A1 ON/OFF COMPRESSOR A1 RELAY
CC.A2 ON/OFF COMPRESSOR A2 RELAY
CC.A3 ON/OFF COMPRESSOR A3 RELAY
CC.A4 ON/OFF COMPRESSOR A4 RELAY

UL.A1 ON/OFF UNLOADER A1 RELAY

UL.A2 ON/OFF UNLOADER A2 RELAY
HGBP ON/OFF HOT GAS BYPASS RELAY
CC.B1 ON/OFF COMPRESSOR B1 RELAY
CC.B2 ON/OFF COMPRESSOR B2 RELAY
CC.B3 ON/OFF COMPRESSOR B3 RELAY
CC.B4 ON/OFF COMPRESSOR B4 RELAY

UL.B1 ON/OFF UNLOADER B1 RELAY

UL.B2 ON/OFF UNLOADER B2 RELAY

LEGEND

EXV — Electronic Expansion Valve

32

Table9—Temperature Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

UNIT

ENTER

CEWT XXX.X °F COOLER ENTERING FLUID
CLWT XXX.X °F COOLER LEAVING FLUID

OAT XXX.X °F OUTSIDE AIR TEMPERATURE
SPT XXX.X °F SPACE TEMPERATURE

CIR.A

ENTER

SCT.A XXX.X °F SATURATED CONDENSING TMP
SST.A XXX.X °F SATURATED SUCTION TEMP
SGT.A XXX.X °F COMPRESSOR SUCTION TEMP
SUP.A XXX.X °F SUCTION SUPERHEAT TEMP

CIR.B

ENTER

SCT.B XXX.X °F SATURATED CONDENSING TMP
SST.B XXX.X °F SATURATED SUCTION TEMP
SGT.B XXX.X °F COMPRESSOR SUCTION TEMP
SUP.B XXX.X °F SUCTION SUPERHEAT TEMP

Table 10 — Pressure Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

PRC.A

ENTER

DP.A

XXX.X

PSIG

DISCHARGE PRESSURE

SP.A

XXX.X

PSIG

SUCTION PRESSURE

PRC.B

ENTER

DP.B

XXX.X

PSIG

DISCHARGE PRESSURE

SP.B

XXX.X

PSIG

SUCTION PRESSURE

Table 11 — Set Point Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

COOL

ENTER

CSP.1 XXX.X °F COOLING SETPOINT 1 Default: 44 F
CSP.2 XXX.X °F COOLING SETPOINT 2 Default: 44 F

HEAD

ENTER

HD.P.A XXX °F HEAD PRESSURE SETPOINT A Default: 113 F

HD.P.B XXX °F HEAD PRESSURE SETPOINT B Default: 113 F

Table 12 — Reading and Changing Chilled Fluid Set Point

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

COOL

ENTER

CSP.1 44.0 °F COOLING SETPOINT 1 Default: 44° F

ENTER

44.0 °F Scrolling stops

ENTER

44.0 °F Value flashes
Select 46.0

ENTER

46.0 °F Change accepted

ESCAPE

CSP.1 46.0 °F COOLING SETPOINT 1 Item/Value/Units scrolls again

33

Table 13 — Inputs Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

GEN.I

ENTER

STST STRT/STOP START/STOP SWITCH Enable/Off/Remote Contact Switch Input

FLOW ON/OFF COOLER 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

ENTER

FKA1 ON/OFF COMPRESSORA1 FEEDBACK
FKA2 ON/OFF COMPRESSORA2 FEEDBACK
FKA3 ON/OFF COMPRESSORA3 FEEDBACK
FKA4 ON/OFF COMPRESSORA4 FEEDBACK
OIL.A OPEN/CLSE OIL PRESSURE SWITCH A
FKB1 ON/OFF COMPRESSOR B1 FEEDBACK
FKB2 ON/OFF COMPRESSOR B2 FEEDBACK
FKB3 ON/OFF COMPRESSOR B3 FEEDBACK
FKB4 ON/OFF COMPRESSOR B4 FEEDBACK
OIL.B OPEN/CLSE OIL PRESSURE SWITCH B

4-20

ENTER

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

34

Table 14 — Outputs Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

GEN.O

ENTER

C.PMP ON/OFF COOLER PUMP RELAY
H.GAS ON/OFF HOT GAS BYPASS RELAY

CIR.A

ENTER

FR.A1 ON/OFF FANA1 RELAY

FR.A2 ON/OFF FANA2 RELAY
CC.A1 ON/OFF COMPRESSOR A1 RELAY
CC.A2 ON/OFF COMPRESSOR A2 RELAY
CC.A3 ON/OFF COMPRESSOR A3 RELAY
CC.A4 ON/OFF COMPRESSOR A4 RELAY

UL.A1 ON/OFF UNLOADER A1 RELAY

UL.A2 ON/OFF UNLOADER A2 RELAY

EXV.A XXX.X % EXV % OPEN

CIR.B

ENTER

FR.B1 ON/OFF FAN B1 RELAY

FR.B2 ON/OFF FAN B2 RELAY
CC.B1 ON/OFF COMPRESSOR B1 RELAY
CC.B2 ON/OFF COMPRESSOR B2 RELAY
CC.B3 ON/OFF COMPRESSOR B3 RELAY
CC.B4 ON/OFF COMPRESSOR B4 RELAY

UL.B1 ON/OFF UNLOADER B1 RELAY

UL.B2 ON/OFF UNLOADER B2 RELAY

EXV.B XXX.X % EXV % OPEN

LEGEND

EXV — Electronic Expansion Valve

Table 15 — Configuration Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

DISP

ENTER

TEST ON/OFF TEST DISPLAY LEDS

METR ON/OFF METRIC DISPLAY Off = English

On = Metric

LANG X LANGUAGE SELECTION Default: 0

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

LEGEND

CCN — Carrier Comfort Network
EMM — Energy Management Module
EXV — Electronic Expansion Valve
LCW — Leaving Chilled Water

35

Table 15 — Configuration Mode and Sub-Mode Directory (cont)

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

UNIT

ENTER

TYPE X UNIT TYPE Default: 1

1 = Air Cooled
TONS XXX UNIT SIZE
CAP.A XXX CIRCUIT A % CAPACITY Unit Size 60 Hz 50 Hz

040 50 43
045 43 46
050 46 43
060 43 50
070 50 57
080* 56 62
090* 50 54
100* 50 50
110* 54 50
130* 50 52
150* 50 60
170* 50 48
190* 50 50
210* 50 52

*And associated modular units.
CMP.A X NUMBER CIRC A COMPRESSOR
CYL.A X COMPRESSOR A1 CYLINDERS 4 = 040, 045 (60 Hz)

6 = 045 (50 Hz), 050-420

CMP.B X NUMBER CIRC B COMPRESSOR
CYL.B X COMPRESSOR B1 CYLINDERS 4 = 040 (60 Hz)

6 = 040 (50 Hz), 045-420

EXV YES/NO EXV MODULE INSTALLED

SH.SP D F EXV SUPERHEAT SETPOINT 29
SH.OF D F EXV SUPERHEAT OFFSET Default: 0

Range: −30 to 30 F
REFG X REFRIGERANT 1 = R-22

FAN.S X FAN STAGING SELECT 1 = 2 Stage Independent (190-210, 290A,

315A, 360B [60 Hz], 390A/B-420A/B)

2 = 3 Stage Independent (130 [50 Hz], 150, 170,

230A-270A, 330A/B, 360B [50 Hz])

3 = 2 Stage Common (040-090,

230B,245B)

4 = 3 Stage Common (100-110,

130 [60 Hz], 255B-315B)

OPT1

ENTER

FLUD X COOLER FLUID Default: 1

1 = Water

2 = Medium Temperature Brine

3 = Low Temperature Brine

(Not Supported)
HGB.S YES/NO HOT GAS BYPASS SELECT
HPCM X HEAD PRESS. CONT. METHOD Default: 2

1 = EXV Control
2 = Set Point Control
3 = Set Point Circuit A, EXV Circuit B
4 = EXV Circuit A, Set Point Circuit B

HPCT X HEAD PRESS. CONTROL TYPE Default: 1

1 = No Control
2 = Air Cooled

PRTS YES/NO PRESSURE TRANSDUCERS CURRENTLY NOT SUPPORTED
PMP.I ON/OFF COOLER PUMP INTERLOCK Default: On

CPC ON/OFF COOLER PUMP CONTROL Default: Off
CA.UN X NO. CIRCUIT A UNLOADERS
CB.UN X NO. CIRCUIT B UNLOADERS

EMM YES/NO EMM MODULE INSTALLED

LEGEND

CCN — Carrier Comfort Network
EMM — Energy Management Module
EXV — Electronic Expansion Valve
LCW — Leaving Chilled Water

36

Table 15 — Configuration Mode and Sub-Mode Directory (cont)

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

OPT2

ENTER

CTRL X CONTROL METHOD Default: 0

0 = Switch
1 = 7 Day Schedule
2 = Occupancy
3 = CCN Control

CCNA XXX CCN ADDRESS Default: 1

Range: 1 to 239

CCNB XXX CCN BUS NUMBER

Default: 0
Range: 0 to 239

BAUD X CCN BAUD RATE Default: 3

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

LOAD X LOADING SEQUENCE SELECT Default: 1

1 = Equal
2 = Staged

LLCS X LEAD/LAG CIRCUIT SELECT Default: 1 (size 080-420) 2 (size 040-070)

1 = Automatic
2 = Circuit A Leads
3 = Circuit B Leads

LCWT XX.X DF HIGH LCW ALERT LIMIT Default: 60

Range: 2 to 60 F

DELY XX MIN MINUTES OFF TIME Default: 0 Minutes

Range: 0 to 15 Minutes

RSET

ENTER

CRST X COOLING RESET TYPE 0 = No Reset

1=4to20mAInput
2 = Outdoor Air Temperature
3 = Return Fluid
4 = Space Temperature

CRT1 XXX.X °F NO COOL RESET TEMP Default: 125 F

Range: 0 to 125 F

CRT2 XXX.X °F FULL COOL RESET TEMP Default: 0° F

Range: 0 to 125 F

DGRC XX.X DF DEGREES COOL RESET Default: 0° F

Range: −30 to 30 F

DMDC X DEMAND LIMIT SELECT Default: 0

0 = None
1 = Switch
2=4to20mAInput
3 = CCN Loadshed

DM20 XXX % DEMAND LIMIT AT 20 MA Default: 100%

Range: 0 to 100%

SHNM XXX LOADSHED GROUP NUMBER Default: 0

Range: 0 to 99

SHDL XXX % LOADSHED DEMAND DELTA Default: 0%

Range: 0 to 60%

SHTM XXX MIN MAXIMUM LOADSHED TIME Default: 60 minutes

Range: 0 to 120 minutes

DLS1 XXX % DEMAND LIMIT SWITCH 1 Default: 80%

Range: 0 to 100%

DLS2 XXX % DEMAND LIMIT SWITCH 2 Default: 50%

Range: 0 to 100%

LLEN ENBL/DSBL LEAD/LAG CHILLER ENABLE Default: Disable
MSSL SLVE/MAST MASTER/SLAVE SELECT Default: Master

SLVA XXX SLAVE ADDRESS Default: 0

Range: 0 to 239

LLBL ENBL/DSBL LEAD/LAG BALANCE SELECT Default: Disable

LLBD XXX HRS LEAD/LAG BALANCE DELTA Default: 168 hours

Range: 40 to 400 Hours

LLDY XX MIN LAG START DELAY

Default: 5 minutes
Range: 0 to 30 minutes

SLCT

ENTER

CLSP X COOLING SETPOINT SELECT Default: 0

0 = Single
1 = Dual Switch
2 = Dual Clock
3=4to20mAInput

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

CRMP X.X COOLING RAMP LOADING Default: 1.0

Range: 0.2 to 2.0

Z.GN X.X DEADBAND MULTIPLIER Default: 1.0

Range: 1.0 to 4.0

37

Table 16 — Example of Temperature Reset (Outdoor Air) Configuration

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

RSET

ENTER

CRST 0 COOLING RESET TYPE 0 = No reset

1=4to20mAinput
2 = Outdoor Air Temp
3 = Return Fluid
4 = Space Temperature

ENTER

0 Scrolling stops

ENTER

0 Value flashes
2 Select 2

ENTER

2 Change accepted

ESCAPE

CRST 2 Item/Value/Units scrolls again

CRT1 125 Range: 0 to 125 F

ENTER

125 Scrolling stops

ENTER

125 Value flashes

75 Select 75

ENTER

75 Change accepted

ESCAPE

CRT1 75 Item/Value/Units scrolls again
CRT2 0 Range: 0 to 125 F

ENTER

0 Scrolling stops

ENTER

0 Value flashes

50 Select 50

ENTER

50 Change accepted

ESCAPE

CRT2 50 Item/Value/Units scrolls again

DGRC 0 Range: −30 to 30 F

ENTER

0 Scrolling stops

ENTER

0 Value flashes

10 Select 10

ENTER

10 Change accepted

ESCAPE

DGRC 10 Item/Value/Units scrolls again

NOTE: The example below shows how to configure the chiller for temperature reset by an accessory
outdoor-air temperature sensor. The chiller will be configured for a full reset of 10 degrees at 50 F and
no reset at 75 F.

38

Table 17 — Example of Configuring Dual Chiller Control

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

RSET

ENTER

CRST 0

LLDY 5 LAG START DELAY

ENTER

5 Scrolling stops

ENTER

5 Value flashes

10 Select 10

ENTER

10 Change accepted

ESCAPE

LLDY 10
LLBD 168 LEAD/LAG BALANCE DELTA No change needed. Default set for weekly changeover
LLBL DSBL LEAD/LAG BALANCE SELECT

ENTER

DSBL Scrolling stops

ENTER

DSBL Value flashes
ENBL Select Enable

ENTER

ENBL Change accepted

ESCAPE

LLBL ENBL
SLVA 0 SLAVE ADDRESS

ENTER

0 Scrolling stops

ENTER

0 Value flashes
6 Select 6

ENTER

6 Change accepted

ESCAPE

SLVA 6

MSSL MAST MASTER/SLAVE SELECT No change needed. Default set for Master

LLEN DSBL LEAD/LAG CHILLER ENABLE

ENTER

DSBL Scrolling stops

ENTER

DSBL Value flashes

MAST Select Master

ENTER

LLEN MAST Change accepted

ESCAPE

LLEN MAST LEAD/LAG CHILLER ENABLE Item/Value/Units scrolls again

39

Table 18 — Example of Compressor Lead/Lag Configuration

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

OPT2

ENTER

CTRL 0 CONTROL METHOD
CCNA 1
CCNB 0
BAUD 3
LOAD 1

LLCS 1 LEAD/LAG CIRCUIT SELECT DEFAULT: 2 (040-070); 1 (080-420)

ENTER

1 Scrolling stops

ENTER

1 Value flashes
3 Select 3

NOTE: Options 1 and/or 3 not valid for sizes 040-070 with­out Circuit B accessory unloader installed

ENTER

3 Change accepted

ESCAPE

LLCS 3 LEAD/LAG CIRCUIT SELECT Item/Value/Units scrolls again

Table 19 — Time Clock Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

TIME

ENTER

HH.MM XX.XX HOUR AND MINUTE Military (00.00-23.59)

DATE

ENTER

MNTH XX MONTH 1=Jan, 2=Feb, etc.

DOM XX DATE OF MONTH Range 1-31

DAY X DAY OF WEEK 1=Mon, 2=Tue, etc.

YEAR XXXX YEAR OF CENTURY

SCHD

ENTER

MON.O XX.XX MONDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

MON.U XX.XX MONDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

TUE.O XX.XX TUESDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

TUE.U XX.XX TUESDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

WED.O XX.XX WEDNESDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

WED.U XX.XX WEDNESDAY UNOCC TIME Range: 00.00 to 23.59

Default: 00.00

THU.O XX.XX THURSDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

THU.U XX.XX THURSDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

FRI.O XX.XX FRIDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

FRI.U XX.XX FRIDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

SAT.O XX.XX SATURDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

SAT.U XX.XX SATURDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

SUN.O XX.XX SUNDAY OCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

SUN.U XX.XX SUNDAY UNOCCUPIED TIME Range: 00.00 to 23.59

Default: 00.00

40

Table 20 — Setting an Occupied Time Schedule

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

SCHD

ENTER

MON.O 00.00 MONDAY OCCUPIED TIME TIME IN MILITARY FORMAT (HH.MM)

ENTER

00.00 Scrolling stops

ENTER

00.00 Hours flash

07.00 Select 7 AM

ENTER

07.00 Change accepted, minutes flash

07.30 Select 30

ENTER

07.30 Change accepted

ESCAPE

MON.O 07.30 MONDAY OCCUPIED TIME Item/Value/Units scrolls again

Table 21 — Operating Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM DISPLAY ITEM EXPANSION COMMENT

MODE

ENTER

MD01 ON/OFF FSM CONTROLLING CHILLER
MD02 ON/OFF WSM CONTROLLING CHILLER
MD03 ON/OFF MASTER/SLAVE CONTROL
MD04 ON/OFF LOW SOURCE PROTECTION
MD05 ON/OFF RAMP LOAD LIMITED
MD06 ON/OFF TIMED OVERRIDE IN EFFECT
MD07 ON/OFF LOW COOLER SUCTION TEMP A
MD08 ON/OFF LOW COOLER SUCTION TEMP B
MD09 ON/OFF SLOW CHANGE OVERRIDE
MD10 ON/OFF MINIMUM OFF TIME ACTIVE

MD11 ON/OFF LOW SUCTION SUPERHEATA
MD12 ON/OFF LOW SUCTION SUPERHEAT B
MD13 ON/OFF DUAL SETPOINT
MD14 ON/OFF TEMPERATURE RESET
MD15 ON/OFF DEMAND LIMIT IN EFFECT
MD16 ON/OFF COOLER FREEZE PROTECTION
MD17 ON/OFF LO TMP COOL/HI TMP HEAT
MD18 ON/OFF HI TMP COOL/LO TMP HEAT

LEGEND

FSM — Flotronic™ System Manager
WSM — Water System Manager

41

Table 22 — Operating Modes

MODE NO. ITEM EXPANSION DESCRIPTION

01 FSM CONTROLLING CHILLER Flotronic™ System Manager (FSM) is controlling the chiller
02 WSM CONTROLLING CHILLER Water System Manager (WSM) is controlling the chiller
03 MASTER/SLAVE CONTROL Lead/Lag Chiller control is enabled.
04 LOW SOURCE PROTECTION Not currently supported.
05 RAMP LOAD LIMITED Ramp load (pulldown) limiting in effect. In this mode, the rate

at which leaving fluid temperature is dropped is limited to a
predetermined value to prevent compressor overloading. See
CRMP set point in the Set Point Select (SLCT) section of the
Configuration mode. The pulldown limit can be modified, if de­sired, to any rate from 0.2° F to 2° F (0.1 to 1 C)/minute.

06 TIMED OVERRIDE IN EFFECT Timed override is in effect. This isa1to4hour temporary

override of the programmed schedule, forcing unit to Occupied
mode. Override can be implemented with unit under Local (En­able) or CCN control. Override expires after each use.

07 LOW COOLER SUCTION TEMP A Circuit A capacity may be limited due to operation of this mode.

Control will attempt to correct this situation for up to 10 minutes
before shutting the circuit down. The control may decrease ca­pacity when attempting to correct this problem. See Alarms and
Alerts section for more information.

08 LOW COOLER SUCTION TEMP B Circuit B capacity may be limited due to operation of this

mode. Control will attempt to correct this situation for up to
10 minutes before shutting the circuit down. The control may
decrease capacity when attempting to correct this problem.
See Alarms and Alerts section for more information.

09 SLOW CHANGE OVERRIDE Slow change override is in effect. The leaving fluid temperature

is close to and moving towards the control point.

10 MINIMUM OFF TIME ACTIVE Chiller is being held off by Minutes Off Time (DELY) found un-

der Options 2 (OPT2) section of Configuration mode.

11 LOW SUCTION SUPERHEAT A Circuit A capacity may be limited due to operation of this mode.

Control will attempt to correct this situation for up to 5 minutes
before shutting the circuit down. See Alarms and Alerts section
for more information.

12 LOW SUCTION SUPERHEAT B Circuit B capacity may be limited due to operation of this

mode. Control will attempt to correct this situation for up to
5 minutes before shutting the circuit down. See Alarms and
Alerts section for more information.

13 DUAL SETPOINT Dual set point mode is in effect. Chiller controls to CSP.1 dur-

ing occupied periods and CSP.2 during unoccupied periods.
Both CSP.1 and CSP.2 are located under COOL in the Set
Point mode.

14 TEMPERATURE RESET Temperature reset is in effect. In this mode, chiller is using

temperature reset to adjust leaving 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.

15 DEMAND LIMIT IN EFFECT Demand limit is in effect. This indicates that the capacity of the

chiller is being limited by 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 ora4to20mAsignal.

16 COOLER FREEZE PROTECTION Cooler fluid temperatures are approaching the Freeze point

(see Alarms and Alerts section for definition). The chiller will be
shut down when either fluid temperature falls below the Freeze
point.

17 LO TMP COOL/HI TMP HEAT Chiller is in Cooling mode and the rate of change of the leaving

fluid is negative and 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.

18 HI TMP COOL/LO TMP HEAT Chiller is in Cooling mode and the rate of change of the leaving

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

42

Table 23 — Alarms Mode and Sub-Mode Directory

SUB-MODE KEYPAD ENTRY ITEM ITEM EXPANSION COMMENT

CRNT

ENTER

AXXX or TXXX CURRENTLY ACTIVE ALARMS

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

RCRN

ENTER

YES/NO RESETALL CURRENT ALARMS

HIST

ENTER

AXXX or TXXX ALARM HISTORY

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

RHIS

ENTER

YES/NO RESET ALARM HISTORY

Table 24 — Example of Reading and Clearing Alarms

SUB-MODE KEYPAD ENTRY ITEM ITEM EXPANSION COMMENT

CRNT

ENTER

AXXX or TXXX CURRENTLY ACTIVE ALARMS

ACTIVE ALARMS (AXXX) OR
ALERTS (TXXX) DISPLAYED.

CRNT

ESCAPE

RCRN

NO Use to clear active alarms/alerts

ENTER

NO NO Flashes

YES Select YES

ENTER

NO Alarms/alerts clear, YES changes to NO

Temperature Reset — The control system is capable

of handling leaving-fluid temperature reset based on return
cooler fluid temperature. Because the change in temperature
through the cooler is a measure of the building load, the re­turn temperature reset is in effect an average building load
reset method. The control system is also capable of tempera­ture reset based on outdoor-airtemperature(OAT), space tem­perature (SPT), or from an externally powered 4 to 20 mA
signal. Accessory sensors must be used for OAT and SPT
reset (HH79NZ014 for OAT and HH51BX006 for SPT). The
Energy Management Module (EMM) must be used for tem­perature reset usinga4to20mAsignal.

To use the return reset, four variables must be configured.
In the Configuration mode under the sub-mode RSET, items
CRST, CRT1, CRT2, and DGRC must be set properly. See
Table 25 on page 42 for correct configuration. See Fig. 2-4
for wiring details.

Under normal operation, the chiller will maintain a con­stant leaving fluid temperature approximately equal to the
chilled fluid set point. As the cooler load varies, the entering
cooler fluid will change in proportion to the load as shown
in Fig. 20. Usually the chiller size and leaving-fluid tem­perature set point are selected based on a full-load condi­tion.Atpartload, the fluid temperature set point may be colder
than required. If the leaving fluid temperature was allowed
to increase at part load, the efficiency of the machine would
increase.

Return temperature reset allows for the leaving tempera­ture set point to be reset upward as a function of the return
fluid temperature or, in effect, the building load.

LEGEND

EWT — Entering Water (Fluid) Temperature
LWT — Leaving Water (Fluid) Temperature

Fig. 20 — Standard Chilled Fluid Temperature

Control — No Reset

43

Table 25 — Configuring Temperature Reset

MODE

GREEN LED)

KEYPAD

ENTRY

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY

ITEM

EXPANSION

COMMENT

CONFIGURATION

ENTER

DISP

ENTER

TEST ON/OFF TEST DISPLAY LEDs

UNIT

ENTER

TYPE X UNIT TYPE

OPT1

ENTER

FLUD X COOLER FLUID

OPT2

ENTER

CTRL X CONTROL METHOD

RSET

ENTER

CRST X COOLING RESET TYPE 0 = No Reset

1 = 4 to 20 mA Input (EMM required)

(Connect to EMM J6-2,5)

2 = Outdoor-Air Temperature

(Connect to TB5-7,8)
3 = Return Fluid (Connect to TB5-5,6)
4 = Space Temperature

CRT1 XXX.X F NO COOL RESET TEMP

Default: 125 F (51.7 C)
Range: 0 to125 F
Set to 4.0 for CRST= 1

CRT2 XXX.X F FULL COOL RESET TEMP

Default: 0° F (−17.8 C)
Range: 0 to 125 F
Set to 20.0 for CRST=1

DGRC XX.X °F DEGREES COOL RESET

Default: 0° F (0° C)
Range: −30 to 30° F (−16.7 to 16.7 C)

The following are examples of outdoor air and space tem­perature resets:

LEGEND

LWT — Leaving Water (Fluid) Temperature

LEGEND

LWT — Leaving Water (Fluid) Temperature

44

Demand Limit — Demand Limit is a feature that allows

the unit capacity to be limited during periods of peak energy
usage. There are 3 types of demand limiting that can be con­figured. The first typeisthrough2-stageswitchcontrol,which
will reduce the maximum capacity to 2 user-configurable per­centages. The second typeisby4to20mAsignal input which
will reduce the maximum capacity linearly between 100%
ata4mAinput signal (no reduction) down to the user­configurable level at a 20 mA input signal. The third type
uses the CNN Loadshed module and has the ability to limit
the current operating capacity to maximum and further re­duce the capacity if required.

NOTE: The 2-stage switch control and 4 to 20 mA input
signal types of demand limiting require the Energy Manage­ment Module (EMM).

To use Demand Limit, select the type of demand limiting
to use. Then configure the Demand Limit set points based on
the type selected.

DEMAND LIMIT (2-Stage Switch Controlled) — To con­figure Demand Limit for 2-stage switch control set the De­mand Limit Select (DMDC) to 1. Then configure the 2 De­mand Limit Switch points (DLS1 and DLS2) to the desired
capacity limit. See Table 26. Capacity steps are controlled
by 2 relay switch inputs field wired to TB6 as shown in
Fig. 2-4.

For Demand Limit by 2-stage switch control, closing the
first stage demand limit contact will put the unit on the first
demand limit level. The unit will not exceed the percentage
of capacity entered as Demand Limit Switch 1 set point. Clos­ing contacts on the second demand limit switch prevents the
unit from exceeding the capacity entered as Demand Limit
Switch 2 set point. The demand limit stage that is set to the

lowest demand takes priority if both demand limit inputs are
closed. If the demand limit percentage does not match unit
staging, the unit will limit capacity to the closest capacity
stage.

To disable demand limit configure the DMDC to 0. See

Table 25.
EXTERNALLY POWERED DEMAND LIMIT (4 to 20 mA

Controlled) — To configure Demand Limit for 4 to 20 mA
control set the Demand Limit Select (DMDC) to 2. Then
configure the Demand Limit at 20 mA (DM20) to the maxi­mum loadshed value desired. The control will reduce allow­able capacity to this level for the 20 mA signal. See Table26
and Fig. 21.

DEMAND LIMIT (CCN Loadshed Controlled) — To con­figure Demand Limit for CCN Loadshed control set the De­mand Limit Select (DMDC) to 3. Then configure the Load­shed Group Number (SHNM), Loadshed Demand Delta
(SHDL), and Maximum Loadshed Time (SHTM). See
Table 26.

The Loadshed Group number is established by the CCN
system designer. The PIC (product integrated control) will
respond to a Redline command from the Loadshed control.
When the Redline command is received, the current stage of
capacity is set to the maximum stages available. Should the
loadshed control send a Loadshed command, the PIC will
reduce the current stages by the value entered for Loadshed
Demand delta. The Maximum Loadshed Time is the defines
the maximum length of time that a loadshed condition is al­lowed to exist. The control will disable the Redline/Loadshed
command if no Cancel command has been received within
the configured maximum loadshed time limit.

Table 26 — Configuring Demand Limit

MODE

KEYPAD

ENTRY

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY ITEM EXPANSION COMMENT

CONFIGURATION

ENTER

DISP

ENTER

TEST ON/OFF Test Display LEDs

UNIT

ENTER

TYPE X Unit Type

OPT1

ENTER

FLUD X Cooler Fluid

OPT2

ENTER

CTRL X Control Method

RSET

ENTER

CRST X Cooling Reset Type

CRT1 XXX.X °F

No Cool Reset

Temperature

CRT2 XXX.X °F

Full Cool Reset

Temperature

DGRC XX.X DF Degrees Cool Reset

DMDC X Demand Limit Select

Default: 0
0 = None
1 = Switch
2=4to20mAInput
3 = CCN Loadshed

DM20 XXX %

Demand Limit at

20 mA

Default: 100%
Range: 0 to 100

SHNM XXX

Loadshed Group

Number

Default: 0
Range: 0 to 99

SHDL XXX%

Loadshed Demand

Delta

Default: 0%
Range: 0 to 60%

SHTM XXX MIN

Maximum Loadshed

Time

Default: 60 min.
Range: 0 to 120 min.

DLS1 XXX %

Demand Limit

Switch 1

Default: 80%
Range: 0 to 100%

DLS2 XXX%

Demand Limit

Switch 2

Default: 50%
Range: 0 to 100

45

TROUBLESHOOTING

Compressor Protection Control System (CPCS)
Board —

The compressor protection board controls the

compressor and compressor crankcase heater.

The ground current protection is provided by the com-

pressor board.

The large relay located on the board is used to provide a

feedback signal to the Main Base Board.

The operation of the compressor board can be checked
using the Service Testprocedure.When the Service Test step
is turned on, the compressor board is energized. All safeties
are continuouslymonitored.Thecrankcase heater will be turned
offandthecompressorcontactorwillbe turned on.The feed­back contacts will close and the Main Base Board (MBB)
will read the feedback status.

If the board does not perform properly, use standard wir­ing troubleshooting procedures to check the wiring for open
circuits. Refer to Alarms and Alerts section on page 45 for
alarm or alert codes for possible causes for failure.

If a compressorshort-to-groundexists,thecompressor board
may detect the short before the circuit breaker trips. If this
is suspected, check the compressor for short-to-ground fail­ures with an ohmmeter. The ground current is sensed with a
current toroid (coil) around all 3 or 6 wires between the main
terminal block and the compressor circuit breaker(s).

Compressor Ground Current (CGC) Board
(30GTN,R130-210, 230A-315A, and 330A/B­420A/B) —

One board is used for each circuit of these
units. Each board receives input from up to 4 toroids wired
in series, one toroid per compressor. With 24 v supplied at
terminals A and B, a current imbalance (compressor ground
current) sensed by any toroid causes the NC (normally closed)
contacts to open, shutting down the lead compressor in the
affectedcircuit.All other compressors in that circuit shutdown
as a result. The NC contacts remain open until the circuit is
reset by momentarily deenergizing the board using the push­button switch.

If the NC contacts open, it is necessary to remove toroids
from the T1-T2 circuit to determine which toroid is causing
the trip. The chiller circuit can then be put back on line after
the circuit breaker of the faulty compressor is opened. The
compressor problem can then bediagnosedbynormaltrouble­shooting procedures.

EXV Troubleshooting— If it appears that the EXV is

not properly controlling operating suction pressure or super­heat, there are a number of checks that can be made using

the quick test and initialization features built into the
ComfortLink™ control.

Follow the procedure below to diagnose and correct EXV

problems.
STEP1—CHECKPROCESSOR EXV OUTPUTS — Check

EXV output signals at the J6 and J7 terminals of the EXV
board.

Turnunit power off. Connect the positive lead of the meter
to terminal 3 on connector J6 on the EXV board. Set meter
for approximately 20 vdc. Turn unit power on. Enter and
enable the Service Test mode. Locate the appropriate valve
under ‘OUTS.’ Select the desired percentage and press En­ter to move the valve. The valve will overdrive in both di­rections when either 0% or 100% are entered. During this
time, connect the negative test lead to terminals 1, 2, 4, and
5 in succession. The voltage should fluctuate at each pin. If
it remains constant at a voltage or at 0 v, replace the EXV
board. If the outputs are correct, then check the EXV.

T otestCircuitB outputs, follow the same procedure above,
except connect the positive lead of the meter to terminal 3
on connector J7 on the EXV board and the negative lead to
terminals 1, 2, 4, and 5 in succession.

STEP2—CHECKEXVWIRING — Check wiring to EXVs
from J6 and J7 terminal strips on EXV board.

1. Check color coding and wire connections. Make sure that

wires are connected to correct terminals at J6 and J7 ter­minal strips and EXV plug connections. Check for cor­rect wiring at driver board input and output terminals. See
Fig. 2-4.

2. Check for continuity and tight connection at all pin

terminals.

3. Check plug connections at J6 and J7 terminal strips and

at EXVs. Be sure EXV connections are not crossed.

STEP3—CHECK RESISTANCEOFEXVMOTOR WIND­INGS — Remove plug at J6 and/or J7 terminal strip and
check resistance between common lead (red wire, terminal
D) and remaining leads A, B, C, and E. Resistance should be
25 ohms ± 2 ohms.

STEP4—CHECK THERMISTORS THAT CONTROLEXV
— Check thermistors that control processor output voltage
pulses to the EXVs. Circuit A thermistor is T7, and circuit
B thermistor is T8. Refer to Fig. 9 and 10 for location.

1. Use service test to determine if thermistors are shorted or

open.

2. Refer to Thermistors section on page 57 for details on

checking thermistor calibration.

50% CAPACITY AT 20 mA

75% CAPACITY AT 12 mA

100% CAPACITY AT 4 mA

0

2

4

6

8

10

12

14

16 18

20

DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT (VOLTS DC)

100

80

60

40

20

0

MAX. ALLOWABLE LOAD (%)

Fig. 21—4to20mADemand Limiting

46

3. Make sure that thermistor leads are connected to the proper
pin terminals at the J5 terminal strip on EXV board and
that thermistor probes are located in proper position in
the refrigerant circuit.

When these checks have been completed, the actual op­eration of the EXV can be checked by using the procedures
outlined in Step 5 — Check Operation of the EXV section
below.

STEP 5 — CHECK OPERATION OF THE EXV — Use the
following procedure tochecktheactualoperationofthe EXVs.
The ENABLE/OFF/REMOTE contact switch must be in the
OFF position.

1. Close the liquid line service valve for the circuit to be

checked and run through the appropriate service test to
pump down the low side of the system. Run lead com­pressor for at least 30 seconds to ensure all refrigerant
has been pumped from the low side and that the EXV has
been driven fully open (1500 steps).

NOTE: Do not use the Emergency ON-OFF switch to re­cycle the control during this step.

2. Turnoff the compressor circuit breaker(s) and the control

circuit power and then turntheEmergencyON/OFFswitch
to the OFF position. Close compressor service valves and
remove any remaining refrigerant from the low side of
the system.

3. Remove screws holding top cover of EXV. Carefully re-

move topcover,using caution to avoid damage totheO-ring
seal and motor leads. If EXV plug was disconnected dur­ing this process, reconnect it after the cover is removed.

4. Note position of lead screw (see Fig. 14). If valve has

responded properly to processor signals in Step 5.1 above,
the valve should be fully open and the lead screw should
protrude approximately

1

⁄4in. to3⁄4in. above the top of

the motor.

5. Recycle the control by turning the control circuit power

on and switching the Emergency ON-OFF switch to the
ON position. This puts the control in initialization mode.
During the first 60 seconds of the initialization mode, each
valve is driven to the fully closed position (1500 steps)
by the processor. With the cover lifted off the EXV valve
body, observe the operation of the valve motor and lead
screw.The motor shouldturninthe counterclockwise (CCW)
direction and the lead screw should move down into the
motor hub until the valve isfullyclosed.Leadscrewmove­ment should be smooth and uniform from the fully open
to the fully closed position.

6. When test has been completed, carefully reassemble

expansion valve. Be careful not to damage motor or
O-ring when reassembling valve. Open compressor serv­ice valves and close compressor circuit breakers. Open

liquid lineservicevalve.Turn the ENABLE/OFF/REMOTE
contact switch and allow unit to operate. Verify proper
operation of unit.

This process of opening and closing the EXV (EXV.A/
EXV.B under OUTS) can be repeated by using these Service
Test steps and recycling the control as described in the pre­ceding steps. If the valve does not operate as described when
properly connected to the processor and receiving the cor­rect signals, it should be replaced.

If operating problems persist after reassembly, they may
be due to out-of-calibration thermistor(s) or intermittent con­nections between the EXVboardterminalsandtheEXVplug.
Recheck all wiring connections and voltage signals.

Other possible causes of improper refrigerant flow con­trol could be restrictions in the liquid line. Check for plugged
filter drier(s), restricted metering slots in the EXV, or par­tially closed liquid line service valves. Formation of ice or
frost on the lower body of the EXV is one symptom of re­stricted metering slots. Clean or replace the valve if neces­sary.Wrap a wet cloth around the valve if it is to be replaced
to prevent the heat from damaging the internal components
of the valve.

NOTE: Frosting of the valve is normal during service test
and at initial start-up. The frost should dissipate after 5 to
10 minutes operation of a system that is operating properly.

NOTE: The EXV orifice is a screw-in type and may be re­moved for inspection and cleaning. Once the top cover has
been removed, the EXV motor may be taken out by remov­ing the 2 cap screws securing motor to valve body. Pull mo­tor, lead screw, and the slide assembly up off the orifice as­sembly. See Fig. 14. A slot has been cut in top of orifice
assembly to facilitate removal using a large screwdriver.Turn
orifice assembly counterclockwise to remove.

When cleaning or reinstalling orifice assembly, be careful
not to damage orifice assembly seals. The bottom seal acts
as a liquid shut-off, replacing a liquid line solenoid valve.

Reassembly of valve is made easier by screwing the slide
and lead screw assembly out of the motor. Align hole in top
of slide with the guide pin in orifice assembly and gently
push slide and lead screw onto orifice assembly about half­way. Screw motor onto lead screw and secure EXV motor
with cap screws. Be careful not to twist or pull on wires from
EXV motor to valve cover pin connections. Check EXV op­eration in quick step steps.

Alarms and Alerts — These are warnings of abnormal

or fault conditions, and may cause either one circuit or the
whole unit to shut down. They are assigned code numbers as
described in Table 27.

47

Table 27 — Alarm and Alert Codes

ALARM/

ALERT

CODE

ALARM

OR

ALERT

DESCRIPTION

WHY WAS THIS

ALARM

GENERATED?

ACTION TAKEN

BY CONTROL

RESET

METHOD

PROBABLE

CAUSE

51 Alert Circuit A, Compressor 1

Failure

Compressor feedback
signal does not match
relay state

Circuit A shut down. Manual High-pressure or loss-of-

charge switch open, faulty
control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

52 Alert Circuit A, Compressor 2

Failure

Compressor feedback
signal does not match
relay state

Circuit A shut down.
Circuit restarted in 1
minute. Compressor
A2 not used until alarm
is reset.

Manual High-pressure switch open,

faulty control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

53 Alert Circuit A, Compressor 3

Failure

Compressor feedback
signal does not match
relay state

Circuit A shut down.
Circuit restarted in 1
minute. Compressor
A3 not used until alarm
is reset.

Manual High-pressure switch open,

faulty control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

54 Alert Circuit A, Compressor 4

Failure

Compressor feedback
signal does not match
relay state

Circuit A shut down.
Circuit restarted in 1
minute. Compressor
A4 not used until alarm
is reset.

Manual High-pressure switch open,

faulty control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

55 Alert Circuit B, Compressor 1

Failure

Compressor feedback
signal does not match
relay state

Circuit B shut down. Manual High-pressure or loss-of-

charge switch open, faulty
control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

56 Alert Circuit B, Compressor 2

Failure

Compressor feedback
signal does not match
relay state

Circuit B shut down.
Circuit restarted in 1
minute. Compressor
B2 not used until alarm
is reset.

Manual High-pressure switch open,

faulty control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

57 Alert Circuit B, Compressor 3

Failure

Compressor feedback
signal does not match
relay state

Circuit B shut down.
Circuit restarted in 1
minute. Compressor
B3 not used until alarm
is reset.

Manual High-pressure switch open,

faulty control relay or CPCS
board, loss of condenser
air, liquid valve closed, op­eration beyond capability.

60 Alarm Cooler Leaving Fluid

Thermistor Failure (T1)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Chiller shutdown after
pumpdown complete.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

61 Alarm Cooler Entering Fluid

Thermistor Failure (T2)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Chiller shutdown after
pumpdown complete.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

64 Alert Circuit A Saturated Con-

densing Thermistor Fail­ure (T3)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit A shutdown
after pumpdown com­plete. (EXV only)

Automatic Thermistor failure, damaged

cable/wire or wiring error.

65 Alert Circuit B Saturated Con-

densing Thermistor Fail­ure (T4)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit B shutdown
after pumpdown
complete.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

66 Alert Circuit A Saturated Suc-

tion Thermistor Failure
(T5)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit A shutdown
after pumpdown com­plete. (EXV only)

Automatic Thermistor failure, damaged

cable/wire or wiring error.

67 Alert Circuit B Saturated Suc-

tion Thermistor Failure
(T6)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit B shutdown
after pumpdown
complete.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

68 Alert Compressor A1 Suction

Gas Thermistor Failure
(T7)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit A shutdown
after pumpdown com­plete. (EXV only).

Automatic Thermistor failure, damaged

cable/wire or wiring error.

69 Alert Compressor B1 Suction

Gas Thermistor Failure
(T8)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Circuit B shutdown
after pumpdown com­plete. (EXV only).

Automatic Thermistor failure, damaged

cable/wire or wiring error.

73 Alert Outside Air Thermistor

Failure (T9)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Temperature reset dis­abled. Chiller runs un­der normal control/set
points.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

74 Alert Space Temperature

Thermistor Failure (T10)

Thermistor outside
range of −40 to 245 F
(−40 to 118 C)

Temperature reset dis­abled. Chiller runs un­der normal control/set
points.

Automatic Thermistor failure, damaged

cable/wire or wiring error.

77 Alert Circuit A Saturated

Suction Temperature
exceeds Cooler Leaving
Fluid Temperature

Saturated suction is
greater than leaving
fluid temperature for
more than 5 minutes

Circuit A shutdown
after pumpdown
complete.

Automatic Faulty expansion valve or

EXV board, faulty cooler
suction thermistor (T5) or
leaving fluid thermistor (T1).

78 Alert Circuit B Saturated

Suction Temperature
exceeds Cooler Leaving
Fluid Temperature

Saturated suction is
greater than leaving
fluid temperature for
more than 5 minutes

Circuit B shutdown
after pumpdown
complete

Automatic Faulty expansion valve or

EXV board, faulty cooler
suction thermistor (T6) or
leaving fluid thermistor (T1).

48

Table 27 — Alarm and Alert Codes (cont)

ALARM/

ALERT

CODE

ALARM

OR

ALERT

DESCRIPTION

WHY WAS THIS

ALARM

GENERAED?

ACTION TAKEN

BY CONTROL

RESET

METHOD

PROBABLE

CAUSE

112 Alert Circuit A High Suction

Superheat

If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem­perature is less than MOP
for 5 minutes

Circuit A shutdown
after pumpdown
complete.

Manual Faulty expansion valve

or EXV board, low re­frigerant charge,
plugged filter drier,
faulty suction gas ther­mistor (T7) or cooler
thermistor (T5).

113 Alert Circuit B High Suction

Superheat

If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem­perature is less than MOP
for 5 minutes

Circuit B shutdown
after pumpdown
complete.

Manual Faulty expansion valve

or EXV board, low re­frigerant charge,
plugged filter drier,
faulty suction gas ther­mistor (T8) or cooler
thermistor (T6).

114 Alert Circuit A Low Suction

Superheat

If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes

Circuit A shutdown
after pumpdown
complete.

Automatic restart
after first daily
occurrence. Manual
restart thereafter.

Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T7) or cooler ther­mistor (T5).

115 Alert Circuit B Low Suction

Superheat

If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes

Circuit B shutdown
after pumpdown
complete.

Automatic restart
after first daily
occurrence. Manual
restart thereafter.

Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T8) or cooler ther­mistor (T6).

116 Alert Circuit A Low Cooler

Suction Temperature

1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*

2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes

1. Mode 7 initiated.
No additional
capacity in­creases. Alert
not tripped.

2. Circuit shutdown
without going
through pump­down.

1. Automatic reset
if corrected.

2. Manual

Faulty expansion valve
or EXV board, low re­frigerant charge,
plugged filter drier,
faulty suction gas ther­mistor (T7) or cooler
thermistor (T5), low
cooler fluid flow.

117 Alert Circuit B Low Cooler

Suction Temperature

1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*

2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes

1. Mode 8 initiated.
No additional
capacity in­creases. Alert
not tripped.

2. Circuit shutdown
without going
through pump­down.

1. Automatic reset
if corrected.

2. Manual

Faulty expansion valve
or EXV board, low re­frigerant charge,
plugged filter drier,
faulty suction gas ther­mistor (T8) or cooler
thermistor (T6), low
cooler fluid flow.

118 Alert Circuit A Low Oil

Pressure

Oil pressure switch open
after 1 minute of continu­ous operation

Circuit shutdown
without going
through pumpdown.

Manual Oil pump failure, low

oil level, switch failure
or compressor circuit
breaker tripped.

119 Alert Circuit B Low Oil

Pressure

Oil pressure switch open
after 1 minute of continu­ous operation

Circuit shutdown
without going
through pumpdown.

Manual Oil pump failure, low

oil level, switch failure
or compressor circuit
breaker tripped.

LEGEND

CCN — Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB — Compressor Expansion Board
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FSM — Flotronic™ System Manager
MBB — Main Base Board
MOP — Maximum Operating Pressure
WSM — Water System Manager

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 −8° F (4.4 C) for single set point and lower of CSP.1/CSP.2

−8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:

1 Zero compressors in a circuit
2 Four compressors in a circuit with two unloaders

3

Four compressors in a circuit with one unloader and hot gas
bypass

4 Two unloaders and hot gas bypass in a circuit.
5 More than one compressor quantity difference between circuits
6 Fluid type of low temperature brine

7

Air cooled head pressure control with common fan staging and
different head pressure control methods for each circuit.

49

Table 27 — Alarm and Alert Codes (cont)

ALARM/
ALEERT

CODE

ALARM

OR

ALERT

DESCRIPTION

WHY WAS THIS

ALARm

GENERATED?

ACTION TAKEN

BY CONTROL

RESET

METHOD

PROBABLE

CAUSE

150 Alarm Emergency Stop CCN emergency stop

command received

Chiller shutdown with­out going through
pumpdown.

Automatic once CCN
command for EMSTOP
returns to
normal

CCN Network
command.

151 Alarm Illegal Configuration One or more of the

illegal configurations
shown in the Note be­low exists.

Chiller is not allowed to
start.

Manual once configu­ration errors are
corrected

Configuration error.
See Note on
page 49.

152 Alarm Unit Down Due to

Failure

Both circuits are down
due to alarms/alerts.

Chiller is unable to run. Automatic once

alarms/alerts are
cleared that prevent
the chiller from
starting.

Alarm notifies user
that chiller is
100% down.

153 Alarm Real Time Clock Hard-

ware Failure

Internal clock on MBB
fails

Occupancy schedule
will not be used. Chiller
defaults to Local On
mode.

Automatic when cor­rect clock control
restarts.

Main Base Board
failure.

154 Alarm Serial EEPROM Hard-

ware Failure

Hardware failure with
MBB

Chiller is unable to run. Manual Main Base Board

failure.

155 Alert Serial EEPROM Stor-

age Failure

Configuration/storage
failure with MBB

No Action Manual Potential failure of

MBB. Download cur­rent operating soft­ware. Replace MBB
if error occurs
again.

156 Alarm Critical Serial

EEPROM Storage
Failure

Configuration/storage
failure with MBB

Chiller is not allowed to
run.

Manual Main Base Board

failure.

157 Alarm A/D Hardware Failure Hardware failure with

peripheral device

Chiller is not allowed to
run.

Manual Main Base Board

failure.

170 Alert Loss of Communica-

tion with CXB

MBB loses communi­cation with CXB

Compressors A3, A4
and B3 and unloaders
A2/B2 unable to
operate.

Automatic Wiring error, faulty

wiring or failed CXB
module.

172 Alarm Loss of Communica-

tion with EXV

MBB loses communi­cation with EXV

Chiller shutdown with­out going through
pumpdown.

Automatic Wiring error, faulty

wiring or failed EXV
module.

173 Alert Loss of Communica-

tion with EMM

MBB loses communi­cation with EMM

4 to 20 mA tempera­ture reset disabled.
Demand Limit set to
100%. 4 to 20 mA set
point disabled.

Automatic Wiring error, faulty

wiring or failed
Energy Manage­ment Module (EMM).

174 Alert 4 to 20 mA Cooling Set

Point Input Failure

If configured with EMM
and input less than
2 mA or greater than
22 mA

Set point function dis­abled. Chiller controls
to CSP1.

Automatic Faulty signal generator,

wiring error, or faulty
EMM.

176 Alert 4 to 20 mA Tempera-

ture Reset Input Fail­ure

If configured with EMM
and input less than
2 mA or greater than
22 mA

Reset function dis­abled. Chiller returns
to normal set point
control.

Automatic Faulty signal generator,

wiring error, or faulty
EMM.

177 Alert 4 to 20 mA Demand

Limit Input Failure

If configured with EMM
and input less than
2 mA or greater than
22 mA

Demand limit function
disabled. Chiller re­turns to 100% demand
limit control.

Automatic Faulty signal generator,

wiring error, or faulty
EMM.

200 Alarm Cooler Pump Interlock

Failure to Close at
Start-Up

If configured for cooler
pump control and
cooler pump interlock
not closed within
1 minute after pump is
started

Cooler pump shut off.
Chiller shutdown with­out going through
pumpdown.

Manual Failure of cooler pump

or controls.

201 Alarm Cooler Pump Interlock

Opened During Normal
Operation

If configured for cooler
pump control and inter­lock opens while cooler
pump relay is on

Cooler pump shut off.
Chiller shutdown with­out going through
pumpdown.

Manual Failure of cooler pump

or controls.

202 Alarm Cooler Pump Interlock

Closed When Pump is
Off

If configured for cooler
pump control and inter­lock closes while
cooler pump relay
is off

Chiller is not allowed to
start.

Manual Failure of cooler pump

relay or interlock,
welded contacts.

50

Table 27 — Alarm and Alert Codes (cont)

ALARM/
ALEERT

CODE

ALARM OR

ALERT

DESCRIPTION

WHY WAS THIS

ALARm

GENERATED?

ACTION TAKEN

BY CONTROL

RESET

METHOD

PROBABLE

CAUSE

203 Alert Loss of Communica-

tion with Slave Chiller

Master MBB loses
communication with
Slave MBB

Dual chiller control dis­abled. Chiller runs as a
stand-alone machine.

Automatic Wiring error, faulty wir-

ing, failed Slave MBB
module, power loss at
Slave chiller, wrong
slave address.

204 Alert Loss of Communica-

tion with Master Chiller

Slave MBB loses com­munication with Master
MBB

Dual chiller control dis­abled. Chiller runs as a
stand-alone machine

Automatic Wiring error, faulty wir-

ing, failed Master MBB
module, power loss at
Master chiller.

206 Alert High Leaving Chilled

Water Temperature

LWT read is greater
than LCW Alert Limit,
Total capacity is 100%
and LWT is greater
than LWT reading one
minute ago

Alert only. No action
taken.

Automatic Building load greater

than unit capacity, low
water/brine flow or
compressor fault.
Check for other
alarms/alerts.

207 Alarm Cooler Freeze Protec-

tion

Cooler EWT or LWT is
less than freeze*

Chiller shutdown with­out going through
pumpdown. Cooler
pump continues to run
(if control enabled).

Automatic for first
occurrence of day.
Manual reset
thereafter.

Faulty thermistor (T1/
T2), low water flow.

208 Alarm Low Cooler Fluid Flow Cooler EWT is less

than LWT by 3° F
(1.7° C) for 1 minute
after a circuit is started

Chiller shutdown with­out going through
pumpdown. Cooler
pump shut off (if con­trol enabled).

Manual Faulty cooler pump,

low water flow, plugged
fluid strainer.

950 Alert Loss of Communica-

tion with WSM

No communications
have been received by
MBB within 5 minutes
of last transmission

WSM forces removed.
Chiller runs under own
control.

Automatic Failed module, wiring

error, failed trans­former, loose connec­tion plug, wrong
address.

951 Alert Loss of Communica-

tion with FSM

No communications
have been received by
MBB within 5 minutes
of last transmission

FSM forces removed.
Chiller runs under own
control.

Automatic Failed module, wiring

error, failed trans­former, loose connec­tion plug, wrong
address.

LEGEND

CCN — Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB — Compressor Expansion Board
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FSM — Flotronic™ System Manager
MBB — Main Base Board
MOP — Maximum Operating Pressure
WSM — Water System Manager

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 −8° F (4.4 C) for single set point and lower of CSP.1/CSP.2

−8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:

1 Zero compressors in a circuit
2 Four compressors in a circuit with two unloaders

3

Four compressors in a circuit with one unloader and hot gas
bypass

4 Two unloaders and hot gas bypass in a circuit.
5 More than one compressor quantity difference between circuits
6 Fluid type of low temperature brine

7

Air cooled head pressure control with common fan staging and
different head pressure control methods for each circuit.

51

SERVICE

ELECTRIC SHOCK HAZARD.
Turn off all power to unit before servicing.

The ENABLE/OFF/REMOTE CONTACT
switch on control panel does not shut off con­trol power; use field disconnect.

Electronic Components

CONTROLCOMPONENTS— Unit uses an advanced elec­tronic control system that normally does not require service.
For details on controls refer to Operating Data section.

30GTN,R040-110,AND 230B-315B UNIT CONTROLBOX
— When facing compressors, main control box is at left end
of unit. All incoming power enters through main box. Con­trol box contains power components and electronic controls.

Outer panels are hinged and latched for easy opening. Re­move screws to remove inner panels. Outer panels can
be held open for service and inspection by using door re­tainer on each panel. To use door retainers: remove bottom
pin from door retainer assembly, swing retainer out horizon­tally,andengagepin in one of the retainer ears and the hinge
assembly.

30GTN,R130-210, 230A-315A,AND330A/B-420A/B UNIT
CONTROLAND MAIN POWER BOXES—The main power
box is on the cooler side of the unit, and the control box is
on the compressor side. Outer panels are hinged and latched
for easy opening. Remove screws to remove inner panels.

Compressors — If lead compressor on either refriger-

ant circuit becomes inoperativeforanyreason,circuitis locked
offandcannotbe operated due to features built into the elec­tronic control system. Do not attempt to bypass controls to

force compressors to run.

COMPRESSOR REMOVAL — Access to the pump end
of the compressor is from the compressor side of the unit.
Access to the motor end of the compressor is from the inside
of the unit. All compressors can be removed from the com­pressor side of the unit.

IMPORTANT:All compressor mounting hardware and
support brackets removed during servicing must be re­installed prior to start-up.

Following the installation of the new compressor:
Tighten discharge valves to —

Compressor(s)

20 to 25 ft-lb (27 to 34 N-m) 06E250

80 to 90 ft-lb (109 to 122 N-m) 06E265,275,299
Tighten suction valves to —

80 to 90 ft-lb (109 to 122 N-m) 06E250

90 to 120 ft-lb (122 to 163 N-m) 06E265,275,299
Tighten the following fittings to —

120 in.-lb (13.5 N-m) High-Pressure Switch
OIL CHARGE (Refer to Table 28) — All units are factory

charged with oil. Acceptable oil level for each compressor is
from

1

⁄8to3⁄8of sight glass.

When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.

Approved oils are as follows:
Petroleum Specialties, Inc. — Cryol 150 (factory oil charge)
Texaco, Inc. — Capella WF-32
Witco Chemical Co. — Suniso 3GS

Table 28 — Oil Charge

COMPRESSOR

OIL REQUIRED

Pts L

06E250 14 6.6
06E265 19 9.0
06E275 19 9.0
06E299 19 9.0

Do not reuse drained oil or any oil that has been exposed

to atmosphere.

Cooler — The cooler is easily accessible from the cooler

side of the unit. The refrigerant feed components are acces­sible from the control box end of the unit.

COOLER REMOVAL — Cooler can be removed from the
cooler side of the unit as follows:

Open and tag all electrical disconnects before any work
begins. Note that cooler is heavy and both fluid-side and
refrigerant-side may be under pressure.

1. To ensure the refrigerant is in the condenser, follow this
procedure:

a. Open the circuit breakers and close the discharge valves

for the lag compressors in both circuits.

Do not close the discharge valve ofanoperatingcom­pressor. Severe damage to the compressor can
result.

b. Afterthelag compressor dischargeservicevalves have

been closed, close the liquid line service valve for one
circuit. Allow the lead compressor to pump down that
circuit until it reaches approximately 10 to 15 psig
(68.8 to 103.2 kPa).

c. Assoon as the system reaches that pressure, shut down

the lead compressor by opening the compressor cir­cuit breaker, then quickly close the discharge service
valve for that compressor.

d. Repeat the procedure for the other circuit.

2. Close the shutoff valves, if installed, in the cooler fluid
lines. Remove the cooler fluid piping.

3. Cooler may be under pressure. Open the air vent at the
top of the cooler, and open the drain on the bottom of the
cooler (near the leaving fluid outlet) to drain the cooler.
Both the drain and the air vent are located on the leaving
fluid end of cooler. See Fig. 22. Remove the cooler
waterside strainer.

4. Disconnect the conduit and cooler heater wires, if equipped.
Remove all thermistors from the cooler, being sure to la­bel all thermistors as they are removed. Thermistor T1 is
a well-type thermistor, and thermistor T2 is immersed
directly in the fluid. See Fig. 22.

5. Remove the insulation on the refrigerant connection end
of the cooler.

6. Unbolt the suction flanges from the cooler head. Save the
bolts.

7. Remove the liquid lines by breaking the silver-soldered
joints at the cooler liquid line nozzles.

8. On 30GTN,GTR080-110 and 230B-315B units, remove
the vertical support(s) under the condenser coil in front
of the cooler.Providetemporarysupportasneeded. Save
all screws for reinstallation later.

9. Remove the screws in the cooler feet. Slide the cooler
slightly to the left to clear the refrigerant tubing. Save all
screws.

52

Removing the cooler can be accomplished inoneof2ways,
depending on the jobsite. Either continue sliding the cooler
toward the end of the unit opposite the tubing and carefully
remove, or pivot the cooler and remove it from the cooler
side of the unit.

REPLACING COOLER — To replace the cooler:

1. Insertnewcoolercarefullyintoplace. Reattach the screws

into the cooler feet (using saved screws).
On 30GTN,GTR080-110 and 230B-315B units, reattach
the 2 vertical supports under the condenser coil in front
of the cooler using screws saved.

2. Replace the liquid lines and solder at the cooler liquid

line nozzles.

3. Reboltthesuction flanges onto the cooler head using bolts

saved during removal. Use new gaskets for the suction
line flanges. Use compressor oil to aid in gasket sealing
and tighten the suction flange bolts to 70 to 90 ft-lb
(94 to 122 N-m).

NOTE: The suction flange has a 4-bolt pattern. See
Carrier specified parts for replacement part number, if
necessary.

4. Using adhesive, reinstall the cooler insulation on the re-

frigerant connection end of the cooler.

5. Reinstall the thermistors. Refer to Thermistors section on

page 57, and install as follows:
a. Apply pipe sealant to the

1

⁄4-in. NPT threads on the
replacement coupling for the fluid side, and install it
in place of the original.

Do not use the packing nut to tighten the coupling.
Damage to the ferrules will result.

b. Reinstall thermistor T1 well, and insert thermistor T1

into well.

c. Install thermistor T2 (entering fluid temperature) so that

it is not touching an internal refrigerant tube, but so
that it is close enough to sense a freeze condition. The
recommended distance is

1

⁄8in. (3.2 mm)fromthecooler
tube.T ightenthepacking nut finger tight, and thentighten
11⁄4turns more using a back-up wrench.

6. Install the cooler heater and conduit (if equipped), con­necting the wires as shown in the unit wiring schematic
located on the unit.

7. Close the air vent at the top of the cooler, and close the
drain on the bottom of the cooler near the leaving fluid
outlet. Both the drain and the air vent are located on the
leaving fluid end of the cooler. See Fig. 22.

8. Reconnect the cooler fluid piping and strainer, and open
the shutoff valves (if installed). Purge the fluid of all air
before starting unit.

9. Openthe dischargeservicevalves,close the circuit break­ers, and open the liquid line service valves for the
compressors.

SERVICING THE COOLER — When cooler heads and par­tition plates are removed, tube sheets are exposed showing
ends of tubes.

Certain tubes in the 10HB coolers cannot be removed.
Eight tubes in the bundle are secured inside the cooler
to the baffles and cannot be removed. These tubes are
marked by a dimple on the tube sheet. See Fig. 23. If

any of these tubes have developed a leak, plug the tube(s)
as described under Tube Plugging section on page 54.

Fig. 22 — Cooler Thermistor Locations

53

Tube Plugging — A leaky tube can be plugged until retub­ing can be done. The number of tubes plugged determines
how soon cooler must be retubed. Tubes plugged in the fol­lowing locations will affect the performance of the unit: Any
tube in the area, particularly the tube that thermistor T2 is
adjacent to, will affectunitreliabilityandperformance.Ther­mistor T2 is used in the freeze protection algorithm for the
controller.Ifseveraltubes require plugging, check with your
local Carrier representative to find out how number and lo­cation can affect unit capacity.

Figure 24 shows an Elliott tube plug and a cross-sectional

view of a plug in place.

Use extreme care when installing plugs to prevent dam­age to the tube sheet section between the holes.

Retubing (See Table 29) — When retubing is to be done,
obtain service of qualified personnel experienced in boiler
maintenance and repair.Moststandardprocedurescanbefol­lowed when retubing the 10HB coolers. An 8% crush is rec­ommended when rolling replacement tubes into the tube
sheet. An 8% crush can be achieved by setting the torque on
the gun at 48 to 50 in.-lb (5.4 to 5.6 N-m).

The following Elliott Co. tube rolling tools are required:

B3400 Expander Assembly
B3401 Cage
B3405 Mandrel
B3408 Rolls

Place one drop of Loctite No. 675 or equivalent on top of
tube prior to rolling. This material is intended to ‘‘wick’’ into
the area of the tube that is not rolled into the tube sheet, and
prevent fluid from accumulating between the tube and the
tube sheet.

Table 29 — Plugs

COMPONENTS FOR

PART NUMBER

PLUGGING

For Tubes

Brass Pin 853103-500*
Brass Ring 853002-570*

ForHoleswithoutTubes

Brass Pin 853103-1*
Brass Ring 853002-631*

Loctite No. 675†

Locquic ‘‘N’’†

*Order directly from: Elliott Tube Company,

Dayton, Ohio

†Can be obtained locally.

Tube information follows:

in. mm

• Tube sheet hole diameter ............0.631 16.03

• TubeOD.........................0.625 15.87

• Tube ID after rolling ...............0.581 14.76

(includes expansion due to to
to clearance) 0.588 14.94

NOTE: Tubes next to gasket webs must be flush with tube
sheet (both ends).

SIZES 040-050 SIZES 060,070

SIZES 080,090* SIZES 100,110*

SIZES 130,150* SIZES 170,190*

SIZE 210*

*And associated modular units (see Table 1).

Fig. 23 — Typical Tube Sheets, Cover Off (Non-Removable Tubes)

Fig. 24 — Eliott Tube Plug

54

Tightening Cooler Head Bolts
Gasket Preparation — When reassembling cooler heads, al-

ways use new gaskets. Gaskets are neoprene-based and are
brushed with a light film of compressor oil. Do not soak gas-
ket or gasket deterioration will result. Use new gaskets within
30 minutes to prevent deterioration. Reassemble cooler nozzle
end or plain end cover of the cooler with the gaskets. Torque
all cooler bolts to the following specification and sequence:

5

⁄8-in. Diameter Perimeter Bolts ......150to170ft-lb

(201 to 228 N-m)

1

⁄2-in. Diameter Flange Bolts ..........70to90ft-lb

(94 to 121 N-m)

1. Install all bolts finger tight.

2. Bolt tightening sequence is outlined in Fig. 25. Follow
the numbering or lettering sequence so that pressure is
evenly applied to gasket.

3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before pro­ceeding to next one-third step.

4. No less than one hour later, retighten all bolts to required
torque values.

5. After refrigerant is restored to system, check for refrig­erant leaks with soap solution or Halide device.

6. Replace cooler insulation.

Condenser Coils

COIL CLEANING — Clean coils with a vacuum cleaner,
fresh water,compressedair, or a bristle brush (not wire). Units

installed in corrosive environments should have coil clean­ing as part of a planned maintenance schedule. In this type
of application, all accumulations of dirt should be cleaned
off the coil.

Do not use high-pressure water or air to clean coils —
fin damage may result.

Condenser Fans — Each fan is supported by a formed

wire mount bolted to fan deck and covered with a wire guard.
The exposed end of fan motor shaft is protected from weather
by grease. If fan motor must be removed for service or
replacement, be sure to regrease fan shaft and reinstall fan
guard. For proper performance, fan should be positioned as
in Fig. 26A and 26B (standard and low-noise applications).
Tighten setscrews to 15 6 1 ft-lb (20 6 1.3 N-m).

If the unit is equipped with the high-static fan option, the
fan must be set from the top of the fan deck to the plastic
ring or center of the fan to a distance of 2.13 in. 6 0.12 in.
(54 6 3 mm). This is differentfromstandardfans,sincethere
is no area available to measure from the top of the orifice
ring to the fan hub itself. See Fig. 27.

IMPORTANT: Check for proper fan rotation (clock­wise viewed from above). If necessary, switch any 2
power leads to reverse fan rotation.

SIZES 080,090* WITH 18-BOLT HEADS

SIZES 080,090* WITH 14-BOLT HEADS

SIZES 100,110* WITH 22-BOLT HEADS

SIZES 100,110* WITH 16-BOLT HEADS

SIZES 130,150*

SIZES 170,190*

SIZE 210*

*And associated modular units.

Fig. 25 — Cooler Head Bolt Tightening Sequence (Typical Tube Sheet)

55

Refrigerant Feed Components — Each circuit has

all necessary refrigerant controls.
ELECTRONIC EXPANSION VALVE(EXV) —Acutaway

view of valve is shown in Fig. 28.

High-pressure liquid refrigerant enters valve through bot­tom. A series of calibrated slots have been machined in side
of orifice assembly .As refrigerant passes through orifice, pres­sure drops and refrigerant changes to a 2-phase condition
(liquid and vapor). To control refrigerant flow for different
operating conditions, a sleeve moves up and down over ori­fice and modulates orifice size. Asleeveis moved by a linear
stepper motor.Steppermotormovesinincrementsandiscon­trolled directly by EXV module. As stepper motor rotates,
motion is transferred into linear movement by lead screw.
Through stepper motor and lead screw, 1500 discrete steps
of motion are obtained. The large number of steps and long
stroke results in very accurate control of refrigerant flow.The
minimum position for operation is 120 steps.

The EXV module controls the valve. The lead compressor
in each circuit has a thermistor located in the suction mani­fold after the compressor motor and a thermistor located in
a well where the refrigerant enters the cooler. The ther­mistors measure the temperature of the superheated gas en­tering the compressor cylinders and the temperature of the
refrigerant entering the cooler. The difference between the
temperature of the superheated gas and the cooler suction
temperature is the superheat. The EXV module controls the
position of the electronic expansion valve stepper motor to
maintain 29 F (16 C) superheat.

The superheat leaving cooler is approximately 3° to 5° F
(2° to 3° C), or less.

Because EXV status is communicated to the Main Base
Board (MBB) and is controlled by the EXV modules (see
Fig. 27), it is possible to track the valve position. By this
means, head pressure is controlledandunitisprotectedagainst
loss of charge and a faulty valve. During initial start-up, EXV
is fully closed. After initialization period, valve position is
tracked by the EXV module by constantly monitoring amount
of valve movement.

The EXV is also used to limit cooler saturated suction tem­perature to 50 F (10 C). This makes it possible for the chiller
to start at higher cooler fluid temperatures without overload­ing the compressor. This is commonly referred to as MOP
(maximum operating pressure).

If it appears that EXV is not properly controlling circuit
operation to maintain correct superheat, there are a number
of checks that can be made using test functions and initial­ization features built intothemicroprocessorcontrol.SeeServ­ice Test section on page 29 to test EXVs.

DIMENSION

FAN TYPE

Standard Low Noise (Optional)

A 0.509 (13 mm) 1.509 (38 mm)
B 0.889 (22 mm) 1.139 (29 mm)

NOTE: Fan rotation is clockwise as viewed from top of unit.

Fig. 26A — Condenser Fan Adjustment —

Standard 50 and 60 Hz Units and

60 Hz Low Noise Fan Option Units

PLASTIC FAN
PROPELLER

CLEARANCE
OF 0.25 INCHES
(6.4 MM)

FAN DECK
SURFACE

FAN ORIFICE

Fig. 26B — Condenser Fan Adjustment —

50 Hz Low Noise Fan Option Units

NOTE: Dimensionsare in millimeters.Dimensionsin [ ] areininches.

Fig. 27 — Condenser Fan Adjustment,

Units with High-Static Fan Option

Fig. 28 — Electronic Expansion Valve (EXV)

56

NOTE: The EXV orifice is a screw-in type that can be re­moved for inspection and cleaning. Once the top cover has
been removed, the EXV motor may be taken out by remov­ing the 2 cap screws securing motor to valve body. Pull mo­tor, lead screw, and the piston sleeve up off the orifice as­sembly. See Fig. 28. A slot has been cut in top of orifice
assembly to facilitate removal using a large screwdriver.Turn
orifice assembly counterclockwise to remove.

When cleaning or reinstalling orifice assembly, be careful
not to damage orifice assembly seals. The bottom seal acts
as a liquid shut-off, replacing a liquid line solenoid valve.

Reassembly of valve is made easier by screwing the pis­ton sleeve and lead screw assembly out of the motor. Align
hole in top of piston sleeve with the guide pin in orifice as­sembly and gently push piston sleeve and lead screw onto
orifice assembly about half way.Screw motor onto lead screw
and secure EXV motor with cap screws. Be careful not to
twist or pull on wires from EXV motor to valve cover pin
connections. Check EXV operation using test functions de­scribed in the Service Test section on page 29.

MOISTURE-LIQUID INDICATOR — Clear flow of liquid
refrigerant indicates sufficient charge in system. Bubbles in
the sight glass indicate undercharged system or presence of
noncondensables. Moisture in system measured in parts per
million (ppm), changes color of indicator:

Green — moisture is below 45 ppm;

Yellow-green (chartreuse) — 45 to 130 ppm (caution);

Yellow (wet) — above 130 ppm.

Change filter drier at first sign of moisture in system.

IMPORTANT: Unit must be in operation at least
12 hours before moisture indicator can give an accu­rate reading. Withunit running, indicating element must
be in contact with liquid refrigerant to give true
reading.

FILTER DRIER — Whenever moisture-liquid indicator shows
presence of moisture, replace filter drier(s). There is one fil­ter drier on each circuit. Refer to Carrier Standard Service
Techniques Manual, Chapter 1, Refrigerants, for details on
servicing filter driers.

LIQUID LINE SOLENOID VALVE — All TXV units have
a liquid line solenoid valve to prevent liquid refrigerant mi­gration to low side of system during the off cycle.

LIQUID LINE SERVICE VALVE — This valve is located
immediately ahead of filter drier, and has a

1

⁄4-in. Schrader
connection for field charging. In combination with compres­sor discharge service valve, each circuit can be pumped down
into the high side for servicing.

Thermistors — Electronic control uses 4 to 10 ther-

mistors to sense temperatures used to control the operation
of chiller.

Thermistors T1-T9 are identical in their temperature vs
resistance and voltage drop performance. Thermistor T10 is
a10kVinput channel and has a different set of temperature
vs resistance and voltage drop performance. Resistances at
various temperatures are listed in Tables 30A-31B.

LOCATION — General locations of thermistor sensors are
shown in Fig. 7-10. See Table 2 for pin connection points.

Sensor T2 is installed directly in the fluid circuit. Re­lieve all pressure or drain fluid before removing.

REPLACING THERMISTOR T2

1. Remove and discard original sensor and coupling. Do not

disassemble new coupling. Install assembly as received.
See Fig. 30.

2. Apply pipe sealant to

1

⁄4-in. NPT threads on replacement
coupling, and install in place of original. Do not use the
packing nut to tighten coupling. Damage to ferrules will
result.

3. Thermistor T2 (entering fluid temperature) should not be
touching an internal refrigerant tube, but should be
close enough to sense a freeze condition. Recommended
distance is

1

⁄8in. (3.2 mm) from cooler tube. Tightenpack­ing nut finger tight to position ferrules, then tighten
11⁄4turns more using a back-up wrench. Ferrules are now
attached to the sensor, which can be withdrawn from cou­pling for service.

3

3

1

2

4

5

1
2
3

4

5

1
2
3

4

5

1

2

4
5

BRN
WHT
RED

BLK

GRN

A
E
D

B
C

PL-EXVB

EXV-B

BRN
WHT
RED

BLK

GRN

J7

J6

PL-EXVA

C

B

D

A
E

EXV-A

ELECTRONIC EXPANSION VALVES (EXVs)

Fig. 29 — Printed Circuit Board Connector

FLUID-SIDE TEMPERATURE SENSOR (T1) AND

REFRIGERANT TEMPERATURE SENSOR (T5, T6, T7, T8)

FLUID-SIDE TEMPERATURE SENSOR (T2)

NOTE: Dimensions in ( ) are in millimeters.

Fig. 30 — Thermistors (Temperature Sensors)

57

REPLACING THERMISTORS T1, T5, T6, T7, AND T8 —
Add a small amount of thermal conductive grease to ther­mistor well. Thermistors are friction-fit thermistors, which
must be slipped into receivers located in the cooler leaving
fluid nozzle for T1, in the cooler head for T5 and T6 (EXV
units only), and in the compressor pump end for T7 and T8
(EXV units only).

THERMISTORS T3 AND T4 — These thermistors are lo­cated on header end of condenser coil. They are clamped on
a return bend.

THERMISTOR/TEMPERATURE SENSOR CHECK — A
high quality digital volt-ohmmeter is required to perform this
check.

1. Connect the digital voltmeter across the appropriate
thermistor terminals at the J8 terminal strip on the Main
Base Board for thermistors T1-T6, T9, T10; or the J5 ter­minal strip on the EXV Board for thermistors T7 and T8
(see Fig. 31). Using the voltage reading obtained, read
the sensor temperature from Tables 30A-31B. To check
thermistor accuracy, measure temperature at probe loca­tion with an accurate thermocouple-type temperature mea­suring instrument. Insulate thermocouple to avoid ambi­ent temperatures from influencing reading. Temperature
measured by thermocouple and temperature determined
from thermistor voltage reading should be close, ± 5° F
(3° C) if care was taken in applying thermocouple and
taking readings.

2. If a more accurate check is required, unit must be shut
down and thermistor removed and checked at a known
temperature (freezing point or boiling point of water) us­ing either voltage drop measured across thermistor at
the J8 or J5 terminals, by determining the resistance with
chiller shut down and thermistor disconnected from J8 or
J5. Compare the values determined with the value read
by the control in the Temperatures mode using the Mar­quee display.

1
2

3

4

1
2

3
4

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

BLU
BLU
PNK
PNK

TB5
TB5
TB5
TB5

5

6
7
8

T10

T9

REMOTE SPACE TEMP
(ACCESSORY)

5
6

7
8

9

10

1

2
3
4

1
2
3
4

5

6
1

2

3
4

5

6

2

1

4

6

3

5

T5

T3

T4

T6

T2

T1

COOLER ENTERING
FLUID TEMP

OUTDOOR-AIR TEMP
(ACCESSORY)

COOLER LEAVING
FLUID TEMP

SATURATED
CONDENSING TEMP­CIRCUIT B

SATURATED
SUCTION TEMP­CIRCUIT B*

SATURATED
CONDENSING TEMP­CIRCUIT A

SATURA TED
SUCTION TEMP­CIRCUIT A*

MAIN BASE BOARD

J8

T1-T6, T9, T10 THERMISTORS

J5

EXV BOARD

12

11

10 9

8

7

6

5

4

32

1

12

11 10 9

T8

8

T7

7

CKTA* CKTB*

COMPRESSOR RETURN GAS TEMP

T7, T8 THERMISTORS

*Not used on FIOP (Factory-Installed Option) unit with TXV (Ther-

mostatic Expansion Valve).

Fig. 31 — Thermistor Connections to J5 and J8

Processor Boards

58

Table 30A — 5K Thermistor Temperatures (°F) vs Resistance/Voltage Drop

(For Thermistors T1-T9)

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

−25 4.538 98,010

−24 4.523 94,707

−23 4.508 91,522

−22 4.493 88,449

−21 4.476 85,486

−20 4.460 82,627

−19 4.444 79,871

−18 4.427 77,212

−17 4.409 74,648

−16 4.391 72,175

−15 4.373 69,790

−14 4.354 67,490

−13 4.335 65,272

−12 4.316 63,133

−11 4.296 61,070

−10 4.276 59,081

−9 4.255 57,162

−8 4.234 55,311

−7 4.213 53,526

−6 4.191 51,804

−5 4.169 50,143

−4 4.146 48,541

−3 4.123 46,996

−2 4.100 45,505

−1 4.076 44,066
0 4.052 42,679
1 4.027 41,339
2 4.002 40,047
3 3.976 38,800
4 3.951 37,596
5 3.924 36,435
6 3.898 35,313
7 3.871 34,231
8 3.844 33,185
9 3.816 32,176

10 3.788 31,202
11 3.760 30,260
12 3.731 29,351
13 3.702 28,473
14 3.673 27,624
15 3.643 26,804
16 3.613 26,011
17 3.583 25,245
18 3.552 24,505
19 3.522 23,789
20 3.490 23,096
21 3.459 22,427
22 3.428 21,779
23 3.396 21,153
24 3.364 20,547
25 3.331 19,960
26 3.299 19,393
27 3.266 18,843
28 3.234 18,311
29 3.201 17,796
30 3.168 17,297
31 3.134 16,814
32 3.101 16,346
33 3.068 15,892
34 3.034 15,453
35 3.000 15,027
36 2.966 14,614
37 2.933 14,214
38 2.899 13,826
39 2.865 13,449
40 2.831 13,084
41 2.797 12,730
42 2.764 12,387
43 2.730 12,053
44 2.696 11,730
45 2.662 11,416
46 2.628 11,112
47 2.594 10,816
48 2.561 10,529
49 2.527 10,250
50 2.494 9,979
51 2.461 9,717
52 2.427 9,461
53 2.395 9,213
54 2.362 8,973
55 2.329 8,739
56 2.296 8,511
57 2.264 8,291
58 2.232 8,076

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

59 2.200 7,868
60 2.168 7,665
61 2.137 7,468
62 2.105 7,277
63 2.074 7,091
64 2.043 6,911
65 2.013 6,735
66 1.982 6,564
67 1.952 6,399
68 1.923 6,238
69 1.893 6,081
70 1.864 5,929
71 1.835 5,781
72 1.806 5,637
73 1.778 5,497
74 1.749 5,361
75 1.722 5,229
76 1.694 5,101
77 1.667 4,976
78 1.640 4,855
79 1.613 4,737
80 1.587 4,622
81 1.561 4,511
82 1.535 4,403
83 1.510 4,298
84 1.485 4,196
85 1.460 4,096
86 1.436 4,000
87 1.412 3,906
88 1.388 3,814
89 1.365 3,726
90 1.342 3,640
91 1.319 3,556
92 1.296 3,474
93 1.274 3,395
94 1.253 3,318
95 1.231 3,243
96 1.210 3,170
97 1.189 3,099
98 1.169 3,031

99 1.148 2,964
100 1.128 2,898
101 1.109 2,835
102 1.089 2,773
103 1.070 2,713
104 1.051 2,655
105 1.033 2,597
106 1.015 2,542
107 0.997 2,488
108 0.980 2,436
109 0.963 2,385
110 0.946 2,335
111 0.929 2,286
112 0.913 2,239
113 0.896 2,192
114 0.881 2,147
115 0.865 2,103
116 0.850 2,060
117 0.835 2,018
118 0.820 1,977
119 0.805 1,937
120 0.791 1,898
121 0.777 1,860
122 0.763 1,822
123 0.750 1,786
124 0.736 1,750
125 0.723 1,715
126 0.710 1,680
127 0.698 1,647
128 0.685 1,614
129 0.673 1,582
130 0.661 1,550
131 0.650 1,519
132 0.638 1,489
133 0.627 1,459
134 0.616 1,430
135 0.605 1,401
136 0.594 1,373
137 0.584 1,345
138 0.573 1,318
139 0.563 1,291
140 0.553 1,265
141 0.543 1,240
142 0.534 1,214

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

143 0.525 1,190
144 0.515 1,165
145 0.506 1,141
146 0.497 1,118
147 0.489 1,095
148 0.480 1,072
149 0.471 1,050
150 0.463 1,029
151 0.455 1,007
152 0.447 986
153 0.440 965
154 0.432 945
155 0.424 925
156 0.417 906
157 0.410 887
158 0.403 868
159 0.396 850
160 0.389 832
161 0.382 815
162 0.376 798
163 0.369 782
164 0.363 765
165 0.357 750
166 0.351 734
167 0.345 719
168 0.339 705
169 0.333 690
170 0.327 677
171 0.322 663
172 0.316 650
173 0.311 638
174 0.306 626
175 0.301 614
176 0.295 602
177 0.291 591
178 0.286 581
179 0.281 570
180 0.276 561
181 0.272 551
182 0.267 542
183 0.263 533
184 0.258 524
185 0.254 516
186 0.250 508
187 0.246 501
188 0.242 494
189 0.238 487
190 0.234 480
191 0.230 473
192 0.226 467
193 0.223 461
194 0.219 456
195 0.216 450
196 0.212 445
197 0.209 439
198 0.205 434
199 0.202 429
200 0.199 424
201 0.196 419
202 0.192 415
203 0.189 410
204 0.186 405
205 0.183 401
206 0.181 396
207 0.178 391
208 0.175 386
209 0.172 382
210 0.169 377
211 0.167 372
212 0.164 367
213 0.162 361
214 0.159 356
215 0.157 350
216 0.154 344
217 0.152 338
218 0.150 332
219 0.147 325
220 0.145 318
221 0.143 311
222 0.141 304
223 0.138 297
224 0.136 289
225 0.134 282

59

Table 30B — 5K Thermistor Temperatures (°C) vs Resistance/Voltage Drop

(For Thermistors T1-T9)

TEMP

(C)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

−32 4.547 100 260

−31 4.520 94 165

−30 4.493 88 480

−29 4.464 83 170

−28 4.433 78 125

−27 4.402 73 580

−26 4.369 69 250

−25 4.335 65 205

−24 4.300 61 420

−23 4.264 57 875

−22 4.226 54 555

−21 4.187 51 450

−20 4.146 48 536

−19 4.104 45 807

−18 4.061 43 247

−17 4.017 40 845

−16 3.971 38 592

−15 3.924 38 476

−14 3.876 34 489

−13 3.827 32 621

−12 3.777 30 866

−11 3.725 29 216

−10 3.673 27 633

−9 3.619 26 202

−8 3.564 24 827

−7 3.509 23 532

−6 3.453 22 313

−5 3.396 21 163

−4 3.338 20 079

−3 3.279 19 058

−2 3.221 18 094

−1 3.161 17 184
0 3.101 16 325
1 3.041 15 515
2 2.980 14 749
3 2.919 14 026
4 2.858 13 342
5 2.797 12 696
6 2.737 12 085
7 2.675 11 506
8 2.615 10 959
9 2.554 10 441

10 2.494 9 949
11 2.434 9 485
12 2.375 9 044
13 2.316 8 627
14 2.258 8 231
15 2.200 7 855

TEMP

(C)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

16 2.143 7 499
17 2.087 7 161
18 2.031 6 840
19 1.976 6 536
20 1.923 6 246
21 1.870 5 971
22 1.817 5 710
23 1.766 5 461
24 1.716 5 225
25 1.667 5 000
26 1.619 4 786
27 1.571 4 583
28 1.525 4 389
29 1.480 4 204
30 1.436 4 028
31 1.393 3 861
32 1.351 3 701
33 1.310 3 549
34 1.270 3 404
35 1.231 3 266
36 1.193 3 134
37 1.156 3 008
38 1.120 2 888
39 1.085 2 773
40 1.051 2 663
41 1.019 2 559
42 0.987 2 459
43 0.956 2 363
44 0.926 2 272
45 0.896 2 184
46 0.868 2 101
47 0.841 2 021
48 0.814 1 944
49 0.788 1 871
50 0.763 1 801
51 0.739 1 734
52 0.716 1 670
53 0.693 1 609
54 0.671 1 550
55 0.650 1 493
56 0.629 1 439
57 0.609 1 387
58 0.590 1 337
59 0.571 1 290
60 0.553 1 244
61 0.536 1 200
62 0.519 1 158
63 0.502 1 118

TEMP

(C)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

64 0.487 1 079
65 0.471 1 041
66 0.457 1 006
67 0.443 971
68 0.429 938
69 0.415 906
70 0.403 876
71 0.390 836
72 0.378 805
73 0.367 775
74 0.355 747
75 0.345 719
76 0.334 693
77 0.324 669
78 0.314 645
79 0.305 623
80 0.295 602
81 0.287 583
82 0.278 564
83 0.270 547
84 0.262 531
85 0.254 516
86 0.247 502
87 0.239 489
88 0.232 477
89 0.226 466
90 0.219 456
91 0.213 446
92 0.207 436
93 0.201 427
94 0.195 419
95 0.189 410
96 0.184 402
97 0.179 393
98 0.174 385

99 0.169 376
100 0.164 367
101 0.160 357
102 0.155 346
103 0.151 335
104 0.147 324
105 0.143 312
106 0.139 299
107 0.135 285

60

Table 31A — 10K Thermistor Temperatures (°F) vs Resistance/Voltage Drop

(For Thermistor T10)

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

−25 4.758 196,453

−24 4.750 189,692

−23 4.741 183,300

−22 4.733 177,000

−21 4.724 171,079

−20 4.715 165,238

−19 4.705 159,717

−18 4.696 154,344

−17 4.686 149,194

−16 4.676 144,250

−15 4.665 139,443

−14 4.655 134,891

−13 4.644 130,402

−12 4.633 126,183

−11 4.621 122,018

−10 4.609 118,076

−9 4.597 114,236

−8 4.585 110,549

−7 4.572 107,006

−6 4.560 103,558

−5 4.546 100,287

−4 4.533 97,060

−3 4.519 94,020

−2 4.505 91,019

−1 4.490 88,171
0 4.476 85,396
1 4.461 82,729
2 4.445 80,162
3 4.429 77,662
4 4.413 75,286
5 4.397 72,940
6 4.380 70,727
7 4.363 68,542
8 4.346 66,465
9 4.328 64,439

10 4.310 62,491

11 4.292 60,612
12 4.273 58,781
13 4.254 57,039
14 4.235 55,319
15 4.215 53,693
16 4.195 52,086
17 4.174 50,557
18 4.153 49,065
19 4.132 47,627
20 4.111 46,240
21 4.089 44,888
22 4.067 43,598
23 4.044 42,324
24 4.021 41,118
25 3.998 39,926
26 3.975 38,790
27 3.951 37,681
28 3.927 36,610
29 3.903 35,577
30 3.878 34,569
31 3.853 33,606
32 3.828 32,654
33 3.802 31,752
34 3.776 30,860
35 3.750 30,009
36 3.723 29,177
37 3.697 28,373
38 3.670 27,597
39 3.654 26,838
40 3.615 26,113
41 3.587 25,396
42 3.559 24,715
43 3.531 24,042
44 3.503 23,399
45 3.474 22,770
46 3.445 22,161
47 3.416 21,573
48 3.387 20,998
49 3.357 20,447
50 3.328 19,903
51 3.298 19,386
52 3.268 18,874
53 3.238 18,384
54 3.208 17,904
55 3.178 17,441
56 3.147 16,991
57 3.117 16,552
58 3.086 16,131
59 3.056 15,714
60 3.025 15,317

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

61 2.994 14,925
62 2.963 14,549
63 2.932 14,180
64 2.901 13,824
65 2.870 13,478
66 2.839 13,139
67 2.808 12,814
68 2.777 12,493
69 2.746 12,187
70 2.715 11,884
71 2.684 11,593
72 2.653 11,308
73 2.622 11,031
74 2.592 10,764
75 2.561 10,501
76 2.530 10,249
77 2.500 10,000
78 2.470 9,762
79 2.439 9,526
80 2.409 9,300
81 2.379 9,078
82 2.349 8,862
83 2.319 8,653
84 2.290 8,448
85 2.260 8,251
86 2.231 8,056
87 2.202 7,869
88 2.173 7,685
89 2.144 7,507
90 2.115 7,333
91 2.087 7,165
92 2.059 6,999
93 2.030 6,838
94 2.003 6,683
95 1.975 6,530
96 1.948 6,383
97 1.921 6,238
98 1.894 6,098

99 1.867 5,961
100 1.841 5,827
101 1.815 5,698
102 1.789 5,571
103 1.763 5,449
104 1.738 5,327
105 1.713 5,210
106 1.688 5,095
107 1.663 4,984
108 1.639 4,876
109 1.615 4,769
110 1.591 4,666
111 1.567 4,564
112 1.544 4,467
113 1.521 4,370
114 1.498 4,277
115 1.475 4,185
116 1.453 4,096
117 1.431 4,008
118 1.409 3,923
119 1.387 3,840
120 1.366 3,759
121 1.345 3,681
122 1.324 3,603
123 1.304 3,529
124 1.284 3,455
125 1.264 3,383
126 1.244 3,313
127 1.225 3,244
128 1.206 3,178
129 1.187 3,112
130 1.168 3,049
131 1.150 2,986
132 1.132 2,926
133 1.114 2,866
134 1.096 2,809
135 1.079 2,752
136 1.062 2,697
137 1.045 2,643
138 1.028 2,590
139 1.012 2,539
140 0.996 2,488
141 0.980 2,439
142 0.965 2,391
143 0.949 2,343
144 0.934 2,297
145 0.919 2,253
146 0.905 2,209

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

147 0.890 2,166
148 0.876 2,124
149 0.862 2,083
150 0.848 2,043
151 0.835 2,003
152 0.821 1,966
153 0.808 1,928
154 0.795 1,891
155 0.782 1,855
156 0.770 1,820
157 0.758 1,786
158 0.745 1,752
159 0.733 1,719
160 0.722 1,687
161 0.710 1,656
162 0.699 1,625
163 0.687 1,594
164 0.676 1,565
165 0.666 1,536
166 0.655 1,508
167 0.645 1,480
168 0.634 1,453
169 0.624 1,426
170 0.614 1,400
171 0.604 1,375
172 0.595 1,350
173 0.585 1,326
174 0.576 1,302
175 0.567 1,278
176 0.558 1,255
177 0.549 1,233
178 0.540 1,211
179 0.532 1,190
180 0.523 1,169
181 0.515 1,148
182 0.507 1,128
183 0.499 1,108
184 0.491 1,089
185 0.483 1,070
186 0.476 1,052
187 0.468 1,033
188 0.461 1,016
189 0.454 998
190 0.447 981
191 0.440 964
192 0.433 947
193 0.426 931
194 0.419 915
195 0.413 900
196 0.407 885
197 0.400 870
198 0.394 855
199 0.388 841
200 0.382 827
201 0.376 814
202 0.370 800
203 0.365 787
204 0.359 774
205 0.354 762
206 0.349 749
207 0.343 737
208 0.338 725
209 0.333 714
210 0.328 702
211 0.323 691
212 0.318 680
213 0.314 670
214 0.309 659
215 0.305 649
216 0.300 639
217 0.296 629
218 0.292 620
219 0.288 610
220 0.284 601
221 0.279 592
222 0.275 583
223 0.272 574
224 0.268 566
225 0.264 557

61

Table 31B — 10K Thermistor Temperatures (°C) vs Resistance/Voltage Drop

(For Thermistor T10)

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

−32 4.762 200,510

−31 4.748 188,340

−30 4.733 177,000

−29 4.716 166,342

−28 4.700 156,404

−27 4.682 147,134

−26 4.663 138,482

−25 4.644 130,402

−24 4.624 122,807

−23 4.602 115,710

−22 4.580 109,075

−21 4.557 102,868

−20 4.533 97,060

−19 4.508 91,588

−18 4.482 86,463

−17 4.455 81,662

−16 4.426 77,162

−15 4.397 72,940

−14 4.367 68,957

−13 4.335 65,219

−12 4.303 61,711

−11 4.269 58,415

−10 4.235 55,319

−9 4.199 52,392

−8 4.162 49,640

−7 4.124 47,052

−6 4.085 44,617

−5 4.044 42,324

−4 4.003 40,153

−3 3.961 38,109

−2 3.917 36,182

−1 3.873 34,367
0 3.828 32,654
1 3.781 31,030
2 3.734 29,498
3 3.686 28,052
4 3.637 26,686
5 3.587 25,396
6 3.537 24,171
7 3.485 23,013
8 3.433 21,918
9 3.381 20,883

10 3.328 19,903
11 3.274 18,972
12 3.220 18,090
13 3.165 17,255
14 3.111 16,464

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

15 3.056 15,714
16 3.000 15,000
17 2.944 14,323
18 2.889 13,681
19 2.833 13,071
20 2.777 12,493
21 2.721 11,942
22 2.666 11,418
23 2.610 10,921
24 2.555 10,449
25 2.500 10,000
26 2.445 9,571
27 2.391 9,164
28 2.337 8,776
29 2.284 8,407
30 2.231 8,056
31 2.178 7,720
32 2.127 7,401
33 2.075 7,096
34 2.025 6,806
35 1.975 6,530
36 1.926 6,266
37 1.878 6,014
38 1.830 5,774
39 1.784 5,546
40 1.738 5,327
41 1.692 5,117
42 1.648 4,918
43 1.605 4,727
44 1.562 4,544
45 1.521 4,370
46 1.480 4,203
47 1.439 4,042
48 1.400 3,889
49 1.362 3,743
50 1.324 3,603
51 1.288 3,469
52 1.252 3,340
53 1.217 3,217
54 1.183 3,099
55 1.150 2,986
56 1.117 2,878
57 1.086 2,774
58 1.055 2,675
59 1.025 2,579
60 0.996 2,488
61 0.968 2,400

TEMP

(F)

VOLTAGE

DROP

(V)

RESISTANCE

(Ohms)

62 0.940 2,315
63 0.913 2,235
64 0.887 2,157
65 0.862 2,083
66 0.837 2,011
67 0.813 1,943
68 0.790 1,876
69 0.767 1,813
70 0.745 1,752
71 0.724 1,693
72 0.703 1,637
73 0.683 1,582
74 0.663 1,530
75 0.645 1,480
76 0.626 1,431
77 0.608 1,385
78 0.591 1,340
79 0.574 1,297
80 0.558 1,255
81 0.542 1,215
82 0.527 1,177
83 0.512 1,140
84 0.497 1,104
85 0.483 1,070
86 0.470 1,037
87 0.457 1,005
88 0.444 974
89 0.431 944
90 0.419 915
91 0.408 889
92 0.396 861
93 0.386 836
94 0.375 811
95 0.365 787
96 0.355 764
97 0.345 742
98 0.336 721

99 0.327 700
100 0.318 680
101 0.310 661
102 0.302 643
103 0.294 626
104 0.287 609
105 0.279 592
106 0.272 576
107 0.265 561

62

Safety Devices — Chillers contain many safety de-

vices and protection logic built into electronic control. Fol­lowing is a brief summary of major safeties.

COMPRESSOR PROTECTION
Circuit Breaker — One manual-reset, calibrated-trip mag-

netic circuit breaker for eachcompressorprotectsagainstover ­current. Do not bypass or increase size of a breaker to cor­rect problems. Determine cause for trouble and correct before
resetting breaker. Circuit breaker must-trip amps (MTA) are
listed on individual circuit breakers, and on unit label
diagrams.

30GTN,R070 (50 Hz), 080-110 and 230B-315B Compres­sor Protection Board (CPCS) — The CPCS is used to con­trol and protect compressors and crankcase heaters. Board
provides following features:

• compressor contactor control

• crankcase heater control

• ground current protection

• status communication to processor board

• high-pressure protection

One large relay is located on CPCS board that controls
crankcase heater and compressor contactor. In addition, this
relay provides a set of contacts that the microprocessor moni­tors to determine operating status of compressor. If the MBB
determines that compressor is not operating properly through
signal contacts, control locks compressor off.

The CPCS contains logic that can detect if current-to­ground of any winding exceeds 2.5 amps; if so, compressor
shuts down.

A high-pressure switch with a trip pressure of
426 ± 7 psig (2936 ± 48 kPa) is mounted on each compres­sor; switch setting is shown in Table 32. Switch is wired in
series with the CPCS. If switch opens, CPCS relay opens,
processor detects it through signal contacts, and compressor
locks off.A loss-of-charge switch is also wired in series with
the high-pressure switch and CPCS.

If any of these switches opens during operation, the com­pressor stops and the failure is detected by the MBB when
signal contacts open. If lead compressor in either circuit is
shut down by high-pressure switch, ground current protec­tor, loss of charge switch, or oil pressure switch, all com­pressors in the circuit are locked off.

30GTN,R130-210, 230A-315A AND 330A/B-420A/B — A
control relay in conjunction with a ground fault module re­places the function of the CPCS (above). To reset, press the
push-button switch near the Marquee display).

Table 32 — Pressure Switch Settings,

psig (kPa)

SWITCH CUTOUT CUT-IN

High Pressure

426±7

(2936 ± 48)

320±20

(2205 ± 138)

Loss-of-Charge 7 (48.2) 22 (151.6)

LOW OIL PRESSURE PROTECTION — Lead compressor
in each circuit is equipped with a switch to detect low oil
pressure. Switch is connected directly to processor board.
Switch is set to open at approximately 5 psig (35 kPa) and
to close at 9 psig (62 kPa) maximum. If switch opens when
compressor is running, CR or processor board stops all com­pressors in circuit. During start-up, switch is bypassed for
2 minutes.

CRANKCASE HEATERS — Each compressor has a
180-w crankcase heater to prevent absorption of liquid re­frigerant by oil in crankcase when compressor is not run­ning. Heater power source is auxiliary control power, inde­pendent ofmainunitpower. This assures compressorprotection
even when main unit power disconnect switch is off.

IMPORTANT: Never open any switch or disconnect
that deenergizes crankcase heaters unless unit is being
serviced or is to be shut down for a prolonged period.
After a prolonged shutdown or service, energize crank­case heaters for 24 hours before starting unit.

COOLER PROTECTION
Freeze Protection — Cooler can be wrapped withheatercables

as shown in Fig. 32, which are wired through an ambient
temperature switch set at 36 F (2 C). Entire cooler is cov­ered with closed-cell insulation applied over heater cables.
Heaters plus insulation protect cooler against low ambient
temperature freeze-up to 0° F (−18 C).

IMPORTANT:If unit is installed in an area where am­bient temperatures fall below 32 F (0° C), it is rec­ommended that inhibited ethylene glycol or other suit­able corrosion-inhibitive antifreeze solution be used in
chilled-liquid circuit.

Low Fluid Temperature — Main Base Board is programmed
to shut chiller down if leaving fluid temperature drops below
34 F (1.1 C) for water or more than 8° F (4.4° C) below
set point for brine units. The unit will shut down without a
pumpout. When fluid temperaturerisesto6°F(3.3°C)above
leaving fluid set point, safety resets and chiller restarts. Re­set is automatic as long as this is the first occurrence.

Loss of Fluid Flow Protection — Main Base Board contains
internal logic that protects cooler against loss of cooler flow.
Entering and leaving fluid temperature sensors in cooler de­tect a no-flow condition. Leaving sensor is located in
leaving fluid nozzle and entering sensor is located in first
cooler baffle space in close proximity to cooler tubes, as shown
in Fig. 20. When there is no cooler flow and the compressors
start, leaving fluid temperature does not change. However,
entering fluid temperature drops rapidly as refrigerant enters
cooler through EXV. Entering sensor detects this tempera­ture drop and when entering temperature is 3° F (1.6° C)
below leaving temperature, unit stops and is locked off.

Loss-of-Charge — A pressure switch connected to high side
of each refrigerant circuit protects against total loss-of­charge. Switch settings are listed in Table 32. If switch is
open, unit cannot start; if it opens during operation, unit locks
out and cannot restart until switch is closed. Low charge is
also monitored by the processor when an EXV is used. The
loss-of-charge switch is wired in series with the high­pressure switch on each circuit’s lead compressor.

LEGEND

T—Thermistor

Fig. 32 — Cooler Heater Cables

63

Relief Devices — Fusible plugs are located in each cir-

cuit to protect against damage from excessive pressures.
HIGH-SIDE PROTECTION — One device is located be-

tween condenser and filter drier; a second is on filter drier.
These are both designed to relieve pressure on a temperature
rise to approximately 210 F (99 C).

LOW-SIDE PROTECTION — A device is located on suc­tion line and is designed to relieve pressure on a temperature
rise to approximately 170 F (77 C).

PRESSURE RELIEF VALVES (208/230, 460, 575 v;
60 Hz Units Only) — Valves are installed in each circuit
(one per circuit). The valves are designed to relieve at
450 psig (3103 kPa). These valves should not be capped. If
a valve relieves, it should be replaced. If valve is not re­placed, it mayrelieveatalowerpressure, or leak due to trapped
dirt from the system which may prevent resealing.

The pressure relief valves are equipped with a

3

⁄8-in. SAE
flare for field connection. Some local building codes require
that relieved gases be removed. This connection will allow
conformance to this requirement.

Other Safeties — There are several other safeties that

are provided by microprocessor control. For details refer to
Alarms and Alerts section on page 47.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or
Start-Up, complete Start-Up Checklist for
ComfortLink™ Chiller Systems at end of this publi­cation (page CL-1).TheChecklist assures proper start-up
of a unit, and provides a record of unit condition, ap­plication requirements, system information, and op­eration at initial start-up.

Do not attempt to start the chiller until following checks

have been completed.

System Check

1. Checkall auxiliary components, such as the chilled fluid
circulating pump, air-handlingequipment,orotherequip­ment to which the chiller supplies liquid. Consult manu­facturer’s instructions. If the unit has field-installed ac­cessories, be sure all are properly installed and wired
correctly. Refer to unit wiring diagrams.

2. Backseat (open) compressor suction and discharge shut­offvalves.Closevalves one turn to allow refrigerant pres­sure to reach the test gages.

3. Open liquid line service valves.

4. Fill the chiller fluid circuit with clean water (with
recommended inhibitor added) or other noncorrosive
fluid to be cooled. Bleed all air out of high points of
system. An air vent is included with the cooler. If out­door temperatures are expected to be below 32 F

(0° C), sufficient inhibited ethylene glycol or other suit­able corrosion-inhibited antifreeze should be added to
the chiller water circuit to prevent possible freeze-up.

5. Check tightness of all electrical connections.

6. Oil should be visible in the compressor sight glass. See
Fig. 31.Anacceptableoillevelinthecompressorisfrom

1

⁄8to3⁄8of sight glass. Adjust the oil level as required.
No oil should be removed unless the crankcase heater
has been energized for at least 24 hours. See Oil Charge
section on page 52 for Carrier-approved oils.

7. Electrical power source must agree with unit
nameplate.

8. Crankcase heaters must be firmly locked into compres-

sors, and must be on for 24 hours prior to start-up.

9. Fan motors are 3 phase. Check rotation of fans during
the service test. Fan rotation is clockwise as viewed from
top of unit. If fan is not turning clockwise, reverse 2 of
the power wires. For low noise fan option on 50 Hz chill­ers, fans rotate counterclockwise as viewed from top of
unit. If fan is not turning counterclockwise, reverse 2 of
the power wires.

10. Check compressor suspension. Mounting rails must be
floating freely on the springs.

11. Perform service test to verify proper settings.

*Lead compressor only.

Fig. 33 — Compressor Connections

(Lead Compressor Shown)

64

START-UP AND OPERATION

NOTE: Refer to Start-Up Checklist on pages CL-1 to CL-8.

Actual Start-Up — Actual start-up should be done

only under supervision of a qualified refrigeration
mechanic.

1. Besureallservicevalvesare open. Units are shipped from
factory with suction, discharge, and liquid line serv­ice valves closed.

2. Using the Marquee display,setleaving-fluid set point (CSP.1
is Set Point mode under sub-mode COOL). No cooling
range adjustment is necessary.

3. Ifoptionalcontrolfunctions or accessories are being used,
the unit must be properly configured. Refer to Operating
Data section for details.

4. Start chilled fluid pump.

5. T urnENABLE/OFF/REMOTECONTACT switch to EN­ABLE position.

6. Allow unit to operate and confirm that everything is func­tioning properly. Check to see that leaving fluid tempera­ture agrees with leaving set point (CSP.1 or CSP.2), or if
reset is used, with the control point (CTPT) in the Run
Status mode under the sub-mode VIEW.

Operating Limitations

TEMPERATURES (See Table 33) — If unit is to be used in
an area with high solar radiation, mounted position should
be such that control box is not exposed to direct solar
radiation. Exposure to direct solar radiation could affect the
temperature switch controlling cooler heaters.

Table 33 — Temperature Limits for Standard Units

TEMPERATURE F C

Maximum Ambient Temperature 125 52
Minimum Ambient Temperature 0 −18
Maximum Cooler EWT* 95 35
Maximum Cooler LWT 70 21
Minimum Cooler LWT† 38 3.3

LEGEND

EWT — Entering Fluid (Water) Temperature
LWT — Leaving Fluid (Water) Temperature

*For sustained operation, EWT should not exceed 85 F (29.4 C).

†Unit requires modification below this temperature.

Low-Ambient Operation — If operating temperatures be­low 0° F (−18 C) are expected, refer to separate installation
instructions for low-ambient operation using accessoryMotor­mastert III control. Contact your Carrier representative for
details.

NOTE: Wind baffles and brackets must be field-fabricated
for all units using accessory Motormaster III controls to en­sure proper cooling cycle operation at low-ambient tempera­tures. See Installation Instructions shipped with the Motor­master III accessory for more details.

Brine duty application (below 38 F [3.3 C] LCWT)
for chiller normally requires factory modification.
Contact your Carrier representative for applicable LCWT
range for standard water-cooled chiller in a specific
application.

VOLTAGE
Main Power Supply — Minimum and maximum acceptable

supply voltages are listed in the Installation Instructions.

Unbalanced 3-Phase Supply Voltage — Never operate a mo­tor where a phase imbalance between phases is greater than
2%. To determine percent voltage imbalance:

max voltage deviation

from avg voltage

% Voltage Imbalance = 100 x

average voltage

The maximum voltage deviation is the largest difference
between a voltage measurement across 2 legs and the aver­age across all 3 legs.

Example: Supply voltage is 240-3-60.

AB = 243 v
BC = 236 v
AC = 238 v

1. Determine average voltage:

243 + 236 + 238

Average voltage =

3

717

=

3

= 239 v

2. Determine maximum deviation from average voltage:

(AB) 243 − 239=4v
(BC) 239 − 236 = 3 v
(AC) 239 − 238=1v

Maximum deviation is 4 v.

3. Determine percent voltage imbalance:

4

% Voltage Imbalance = 100 x

239

= 1.7%

This voltage imbalance is satisfactory as it is below the
maximum allowable of 2%.

IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local electric utility com­pany immediately.Donot operate unit until imbalance
condition is corrected.

Control Circuit Power — Electronic control includes logic
to detect low controlcircuitvoltage.Acceptable voltage ranges
are shown in the Installation Instructions.

MINIMUM FLUID LOOP VOLUME — To obtain proper
temperature control, loop fluid volume must be at least
3 gallons per ton (3.25 L per kW) of chiller nominal capac­ity for air conditioning and at least 6 gallons per ton (6.5 L
per kW) for process applications or systems that must op­erate at low ambient temperatures (below 32 F [0° C]).
Refer to application information in Product Data literature
for details.

FLOW RATE REQUIREMENTS — Standard chillers should
be applied with nominal flow rates approximating those listed
in Table 34. Higher or lower flow rates are permissible to
obtain lower or higher temperature rises. Minimum flow rates
must be exceeded to assure turbulent flow and proper heat
transfer in the cooler.

Operation below minimum flow rate could subject tubes
to frost pinching in tube sheet, resulting in failure of
cooler.

65

Consult application data section in the Product Data lit­erature and job design requirements to determine flow rate
requirements for a particular installation.

Table 34 — Nominal and Minimum Cooler

Fluid Flow Rates

30GTN,R

UNIT

SIZE

NOMINAL FLOW

RATE*

MINIMUM FLOW

RATE (See Notes)

Gpm L/s Gpm L/s

040 86 5.43 36.8 2.32
045 101 6.37 37.7 2.38
050 123 7.76 37.7 2.38
060 151 9.53 47.5 3.00

070 173 10.91 47.5 3.00
080,230B 192 12.11 66.7 4.20
090,245B 216 13.62 59.5 3.75

100,255B,270B 240 15.14 84.1 5.30
110,290B,315B 264 16.65 84.1 5.30

130 300 18.9 110 6.9

150,230A-255A 348 21.9 110 6.9

170,270A,330A/B,

360B (50 Hz)

384 24.2 120 7.5

190,290A,360A/B (60 Hz),

360A (50 Hz),390B

432 27.2 120 7.5

210,315A,390A,420A/B 480 30.2 148 9.3

LEGEND

ARI — Air Conditioning and Refrigeration Institute
Gpm — Gallons per minute (U.S.)
L/s — Liters per second
N—Liters per kW
V—Gallons per ton

*Nominalflowrates requiredatARIconditionsare 44F(6.7 C)leaving-

fluid temperature, 54 F (12.2 C) entering-fluid temperature, 95 F
(35 C) ambient. Fouling factor is .00001 ft

2

• hr • F/Btu (.000018 m

2

• K/W).

NOTES:

1. Minimum flow based on 1.0 fps (0.30 m/s) velocity in cooler with­out special cooler baffling.

2. Minimum Loop Volumes:
Gallons=VxARICap. in tons
Liters = N x ARI Cap. in kW

APPLICATION V N

Normal Air Conditioning 3 3.25
Process Type Cooling 6 to 10 6.5 to 10.8
Low Ambient Unit Operation 6 to 10 6.5 to 10.8

Operation Sequence — During unit off cycle, crank-

case heaters are energized. If ambient temperature is below
36 F (2 C), cooler heaters (if equipped) are energized.

The unit is started by putting the ENABLE/OFF/REMOTE
CONTACT switch in ENABLE or REMOTE position. When
the unit receives a call for cooling (either from the internal

control or CCN network command or remote contact clo­sure), the unit stages up in capacity to maintain the cooler
fluid set point. The first compressor starts 1

1

⁄2to 3 minutes

after the call for cooling.

The lead circuit can be specifically designated or ran­domly selected by the controls, depending on how the unit
is field configured (for 040-070 sizes, Circuit A leads unless
an accessory unloader is installed on Circuit B). A field con­figuration is also available to determine if the unit should
stage up both circuits equally or load one circuit completely
before bringing on the other.

When the lead circuit compressor starts, the unit starts with
a pumpout routine. On units with the electronic expansion
valve (EXV), compressor starts and continues to run with
the EXV at minimum position for 10 seconds to purge the
refrigerant lines andcoolerofrefrigerant.The EXV then moves
to 23% and the compressor superheat control routine takes
over,modulatingthe valve to feed refrigerant into the cooler.

On units with thermostatic expansion valve (TXV)
(30GTN,R040,045 units with brine option), head pressure
control is based on set point control. When the lead com­pressor starts, the liquid line solenoid valve (LLSV) is kept
closed for 15 seconds by a time delay relay. The micro­processor stages fans to maintain the set point temperature
specified by the controller. There is no pumpout sequence
during shutdown of TXV controlled chillers.

On all other units (EXV units), the head pressure is con­trolled by fan cycling. The desired head pressure set point is
entered, and is controlled by EXV position or saturated con­densing temperature measurement (T3 and T4). For proper
operation, maintain set point of 113 F (45 C) as shipped from
factory.The default head pressure control method is set point
control. The head pressure control can also be set to EXV
control or a combination of the 2 methods between circuits.

For all units, if temperature reset is being used, the unit
controls to a higher leaving-fluid temperature as the build­ing load reduces. If demand limit is used, the unit may tem­porarily be unable to maintain the desired leaving-fluid tem­perature because of imposed power limitations.

On EXV units, when the occupied period ends, or when
the building load drops low enough, the lag compressors shut
down.Theleadcompressorscontinueto run as the EXV closes,
and until the conditions of pumpout are satisfied. If a fault
condition is signaled requiring immediate shutdown,
pumpout is omitted.

Loading sequence for compressors is shown in Tables 5A
and 5B.

66

APPENDIX A — CCN TABLES

UNIT (Configuration Settings)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 Unit Type 1 = Air Cooled

2 = Water Cooled
3 = Split System
4 = Heat Machine
5 = Air Cooled Heat Reclaim

1 UNIT TYP

2 Unit Size 15 to 300 20 TONS SIZE
3 Circuit A1% Capacity 0 to 100 50 % CAP A
4 Number Circ A Compressor 1 to 4 1 NUMCA
5 Compressor A1 Cylinders 4 or 6 6 NUM CYLA
6 Number Circ B Compressor 1 to 4 1 NUMCB
7 Compressor B1 Cylinders 4 or 6 6 NUM CYLB
8 EXV Module Installed No/Yes Yes EXV BRD
9 EXV Superheat Setpoint 10 to 40 29.0 ^F SH SP

10 EXV MOP 40 to 80 50.0 °F MOP SP

11 EXV Superheat Offset − 20 to 20 0.0 ^F SH OFFST
12 EXV Circ. A Min Position 0 to 100 8.0 % EXVAMINP
13 EXV Circ. B Min Position 0 to 100 8.0 % EXVBMINP
14 Refrigerant 1 = R22

2 = R134A

1 REFRIG T

15 Low Pressure Setpoint 3 to 60 10.0 PSI LOW PRES
16 Fan Staging Select 1 = 2 Stage indpt.

2 = 3 Stage indpt.
3 = 2 Stage common
4 = 3 Stage common

1 FAN TYPE

OPTIONS1 (Options Configuration)

DESCRIPTION STATUS DEFAULT POINT

1 Cooler Fluid 1 = Water

2 = Med. Brine
3 = Low Brine

1 FLUIDTYP

2 Hot Gas Bypass Select No/Yes No HGBV FLG
3 Head Press. Cont. Method 1 = EXV controlled

2 = Setpoint controlled
3 = Setpoint-A, EXV-B
4 = EXV-A, Setpoint-B

2 HEAD MET

4 Head Press. Control Type 0 = None

1 = Air Cooled
2 = Water Cooled

0 HEAD TYP

5 Pressure Transducers No/Yes No PRESS TY
6 Cooler Pump Interlock Off/On On LOCK FLG
7 Cooler Pump Control Off/On Off CPC
8 No. Circuit A Unloaders 0-2 1 NUNLA
9 No. Circuit B Unloaders 0-2 1 NUNLB

10 EMM Module Installed No/Yes No EMM BRD

67

CONFIGURATION SCREEN (TYPE 10)

OPTIONS2 (Options Configuration)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 Control Method 0 = Switch

1 = 7 day sched.
2 = Occupancy
3 = CCN

0 CONTROL

2 Loading Sequence Select 1 = Equal loading

2 = Staged loading

1 SEQ TYPE

3 Lead/Lag Sequence Select 1 = Automatic

2 = Circuit A leads
3 = Circuit B leads

1 LEAD TYP

4 Cooling Setpoint Select 0 = Single

1 = Dual, remote switch controlled
2 = Dual, clock controlled
3 = 4-20 ma input

0 CLSP TYP

5 Ramp Load Select ON/OFF OFF RAMP EBL
6 High LCW Alert Limit 2 to 60 60.0 ^F LCW LMT
7 Minutes off time 0 to 15 0 min DELAY
8 Deadband Multiplier 1.0 to 4.0 1.0 Z GAIN

DISPLAY (STDU SETUP)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 STDU Password nnnn 1111 PASSWORD
2 Password Enable enable/disable enable PASS EBL
3 Metric Display Off/On Off DISPUNIT
4 Language 0 = ENGLISH

1 = FRANCAIS
2 = ESPANOL
3 = PORTUGUES

0 LANGUAGE

CONFIG (TIMED OVERRIDE SETUP)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 Schedule Number 0-99 0 SCHEDNUM
2 Override Time Limit 0-4 0 hours OTL
3 Timed Override Hours 0-4 0 hours OTL EXT

ALARMDEF (Alarm Definition Table)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 Alarm Routing Control

ALRM_CNT

00000000 00000000

2 Equipment Priority

EQP_TYPE

0to7 4

3 Comm Failure Retry Time 1 to 240 10 min RETRY_TM
4 Re-alarm Time 1 to 255 30 min RE-ALARM
5 Alarm System Name XXXXXXXX 30_PIC ALRM_NAM

68

RESETCON (Temperature Reset and Demand Limit)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 COOLING RESET
2 Cooling Reset Type 0 = No Reset

1 = 4-20 ma input
2 = External temp-OAT
3 = Return fluid
4 = External temp-SPT

0 CRST TYP

3 No Cool Reset Temp 0 to 125 0.0 °F CT NO
4 Full Cool Reset Temp 0 to 125 125.0 °F CT FULL
5 Degrees Cool Reset −30 to 30 0.0 ^F CT DEG
6 DEMAND LIMIT
7 Demand Limit Select 0 = None

1 = External switch input
2 = 4-20 ma input
3 = Loadshed

0 DMD CTRL

8 Demand Limit at 20mA 0 to 100 100 % DMT20MA
9 Loadshed Group Number 0 to 99 0 SHED NUM

10 Loadshed Demand Delta 0 to 60 0 % SHED DEL

11 Maximum Loadshed Time 0 to 120 60 min SHED TIM
12 Demand Limit Switch 1 0 to 100 80 % DLSWSP1
13 Demand Limit Switch 2 0 to 100 50 % DLSWSP2
14 LEAD/LAG
15 Lead/Lag Enable Enable/Disable Disable LL ENA
16 Master/Slave Select Slave/Master Master MS SEL
17 Slave Address 0 to 239 0 SLV ADDR
18 Lead/Lag Balance Select Enable/Disable Disable LL BAL
19 Lead/Lag Balance Delta 40 to 400 168 hours LL BAL D
20 Lag Start Delay 0 to 30 5 mins LL DELAY

BRODEFS (Broadcast POC Definition Table)

DESCRIPTION STATUS DEFAULT UNITS POINT

1 CCN Time/Date Broadcast Yes/No No CCNBC
2 CCN OAT Broadcast Yes/No No OATBC
3 Global Schedule Broadcst Yes/No No GSBC
4 CCN Broadcast Acker Yes/No No CCNBCACK
5 Daylight Savings Start
6 Month 1 to 12 1 STARTM
7 Week 1to5 1 STARTW
8 Day 1to7 0 STARTD

9 Minutes to add 0 to 99 0 min MINADD
10 Daylight Savings Stop
11 Month 1 to 12 1 STOPM
12 Week 1 to 5 1 STOPW
13 Day 1 to 7 0 STOPD
14 Minutes to subtract 0 to 99 0 min MINSUB

69

GENUNIT (General Unit Parameters)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 Control Mode 0 = Service Test

1 = OFF - local control
2 = OFF-CCN control
3 = OFF-timeclock
4 = Emergency stop
5 = ON-local control
6 = ON-CCN control
7 = ON-timeclock

MODE N

2 Occupied Yes/No OCC N
3 CCN Chiller Start/Stop CHIL S S

Y

4 Alarm State Normal ALM N
5 Active Demand Limit 0-100 % DEM LIM

Y

6 Percent Total Capacity 0-100 % CAP T

N

7 Requested Stage nn STAGE N
8 Load/Unload Factor snnn.n SMZ N
9 Active Setpoint snnn.n °F SP N

10 Control Point snnn.n °F CTRL PNT

Y

11 Entering Fluid Temp snnn.n °F EWT N
12 Leaving Fluid Temp snnn.n °F LWT N
13 Emergency Stop Enable/Emstop EMSTOP Y
14 Minutes Left for Start nn min MIN LEFT

N

CIRCA AN (Circuit A Analog values)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 Circuit AAnalog Values
2 Percent Total Capacity 0-100 % CAPA T

N

3 Percent Available Cap 0-100 % CAPA A

N

4 Discharge Pressure nnn.n PSI DP A

N

5 Suction Pressure nnn.n PSI SP A

N

6 Saturated Condensing Tmp snnn.n °F TMP SCTA

N

7 Saturated Suction Temp snnn.n °F TMP SSTA

N

8 Compressor Suction Temp snnn.n °F CTA TMP

N

9 Suction Superheat Temp snnn.n ^F SH A

N

10 EXV % Open 0-100.0 % EXV A

N

CIRCA DO (Circuit A Discrete Parameters)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 Circuit A Discretes
2 Fan A1 Relay ON/OFF FAN A1

N

3 Fan A2 Relay ON/OFF FAN A2

N

4 Oil Pressure Switch OPEN/CLOSE OILSW A

N

5 Compressor A1 Relay ON/OFF K A1 RLY

N

6 Compressor A2 Relay ON/OFF K A2 RLY

N

7 Compressor A3 Relay ON/OFF K A3 RLY

N

8 Compressor A4 Relay ON/OFF K A4 RLY

N

9 Unloader A1 Relay ON/OFF UNL A1

N

10 Unloader A2 Relay ON/OFF UNL A2

N

11 Hot Gas Bypass Relay ON/OFF HGAS N

70

CIRCB AN (Circuit B Analog Parameters)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 Circuit B Analog Values
2 Percent Total Capacity 0-100 % CAPB T

N

3 Percent Available Cap 0-100 % CAPB A

N

4 Discharge Pressure nnn.n PSI DP B

N

5 Suction Pressure nnn.n PSI SP B

N

6 Saturated Condensing Tmp snnn.n °F TMP SCTB

N

7 Saturated Suction Temp snnn.n °F TMP SSTB

N

8 Compressor Suction Temp snnn.n °F CTB TMP

N

9 Suction Superheat Temp snnn.n ^F SH B

N

10 EXV % Open 0-100.0 % EXV B

N

CIRCB DO (Circuit B Discrete Parameters)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 Circuit B Discretes
2 Fan B1 Relay ON/OFF FAN B1

N

3 Fan B2 Relay ON/OFF FAN B2

N

4 Oil Pressure Switch OPEN/CLOSE OILSW B

N

5 Compressor B1 Relay ON/OFF K B1 RLY

N

6 Compressor B2 Relay ON/OFF K B2 RLY

N

7 Compressor B3 Relay ON/OFF K B3 RLY

N

8 Compressor B4 Relay ON/OFF K B4 RLY

N

9 Unloader B1 Relay ON/OFF UNL B1

N

10 Unloader B2 Relay ON/OFF UNL B2

N

11 Hot Gas Bypass Relay ON/OFF HGAS N

OPTIONS (Unit Parameters)

DESCRIPTION STATUS UNITS POINT FORCEABLE

1 UNIT Analog Values
2 Cooler Entering Fluid snnn.n °F COOL EWT

N

3 Cooler Leaving Fluid snnn.n °F COOL LWT

N

4 Temperature Reset
5 4-20 MA Reset Signal nn.n ma RST MA

N

6 Outside Air Temperature snnn.n °F OAT Y
7 Space Temperature snn.n °F SPT Y
8 Demand Limit
9 4-20 MA Demand Signal nn.n ma LMT MA

N

10 Demand Limit Switch 1 ON/OFF DMD SW1

N

11 Demand Limit Switch 2 ON/OFF DMD SW2

N

12 CCN Loadshed Signal Normal/Redline/Shed DL STAT

N

13 Pumps
14 Cooler Pump Relay ON/OFF COOL PMP

N

15 Miscellaneous
16 Dual Setpoint Switch ON/OFF DUAL IN

N

17 Cooler Flow Switch ON/OFF COOLFLOW N
18 Ice Done ON/OFF ICE N

71

STRTHOUR

DESCRIPTION STATUS UNITS POINT

1 Machine Operating Hours nnnnn hours HR MACH
2 Machine Starts nnnnn CY MACH
3
4 Circuit A Run Hours nnnnn hours HR CIRA
5 Compressor A1 Hours nnnnn hours HR A1
6 Compressor A2 Hours nnnnn hours HR A2
7 Compressor A3 Hours nnnnn hours HR A3
8 Compressor A4 Hours nnnnn hours HR A4

9 Circuit B Run Hours nnnnn hours HR CIRB
10 Compressor B1 Hours nnnnn hours HR B1
11 Compressor B2 Hours nnnnn hours HR B2
12 Compressor B3 Hours nnnnn hours HR B3
13 Compressor B4 Hours nnnnn hours HR B4
14
15 Circuit A Starts nnnnn CY CIRA
16 Compressor A1 Starts nnnnn CY A1
17 Compressor A2 Starts nnnnn CY A2
18 Compressor A3 Starts nnnnn CY A3
19 Compressor A4 Starts nnnnn CY A4
20 Circuit B Starts nnnnn CY CIRB
21 Compressor B1 Starts nnnnn CY B1
22 Compressor B2 Starts nnnnn CY B2
23 Compressor B3 Starts nnnnn CY B3
24 Compressor B4 Starts nnnnn CY B4

ALARMS

DESCRIPTION STATUS UNITS POINT

1 Active Alarm #1 Axxx ALARM01C
2 Active Alarm #2 Axxx ALARM02C
3 Active Alarm #3 Axxx ALARM03C
4 Active Alarm #4 Axxx ALARM04C
5 Active Alarm #5 Axxx ALARM05C
6 Active Alarm #6 Axxx ALARM06C
7 Active Alarm #7 Axxx ALARM07C
8 Active Alarm #8 Axxx ALARM08C

9 Active Alarm #9 Axxx ALARM09C
10 Active Alarm #10 Axxx ALARM10C
11 Active Alarm #11 Axxx ALARM11C
12 Active Alarm #12 Axxx ALARM12C
13 Active Alarm #13 Axxx ALARM13C
14 Active Alarm #14 Axxx ALARM14C
15 Active Alarm #15 Axxx ALARM15C
16 Active Alarm #16 Axxx ALARM16C
17 Active Alarm #17 Axxx ALARM17C
18 Active Alarm #18 Axxx ALARM18C
19 Active Alarm #19 Axxx ALARM19C
20 Active Alarm #20 Axxx ALARM20C
21 Active Alarm #21 Axxx ALARM21C
22 Active Alarm #22 Axxx ALARM22C
23 Active Alarm #23 Axxx ALARM23C
24 Active Alarm #24 Axxx ALARM24C
25 Active Alarm #25 Axxx ALARM25C

NOTE: Alerts will displayed as Txxx

72

CURRMODS

DESCRIPTION STATUS UNITS POINT

1 FSM controlling chiller ON/OFF MODE 1
2 WSM controlling chiller ON/OFF MODE 2
3 Master/Slave control ON/OFF MODE 3
4 Low source protection ON/OFF MODE 4
5 Ramp Load Limited ON/OFF MODE 5
6 Timed Override in effect ON/OFF MODE 6
7 Low Cooler Suction TempA ON/OFF MODE 7
8 Low Cooler Suction TempB ON/OFF MODE 8
9 Slow Change Override ON/OFF MODE 9

10 Minimum OFF Time ON/OFF MODE 10

11 Low Suction Superheat A ON/OFF MODE 11
12 Low Suction Superheat B ON/OFF MODE 12
13 Dual Setpoint ON/OFF MODE 13
14 Temperature Reset ON/OFF MODE 14
15 Demand Limit in effect ON/OFF MODE 15
16 Cooler Freeze Prevention ON/OFF MODE 16
17 Lo Tmp Cool/Hi Tmp Heat ON/OFF MODE 17
18 Hi Tmp Cool/Lo Tmp Heat ON/OFF MODE 18

SETPOINT

DESCRIPTION STATUS UNITS POINT DEFAULTS

1 COOLING
2 Cool Setpoint 1 −20 to 70 °F CSP1 44
3 Cool Setpoint 2 −20 to 70 °F CSP2 44
4 RAMP LOADING
5 Cooling Ramp Loading 0.2 to 2.0 °F/min CRAMP 1.0
6 HEAD PRESSURE
7 Head Press. Stpt A 80 to 140 °F HSP A

113

8 Head Press. Stpt B 80 to 140 °F HSP B

113

LID DEFAULT SCREEN DEFINITION

TABLE TYPE 19 HEX

DESCRIPTION STATUS UNITS POINT DISPLAY

1 (SYSTEM PRIMARY MESSAGE)
2 (SYSTEM SECONDARY MESSAGE)
3 Machine Operating Hours nnnnn hours HR MACH

HR MACH

4 Entering Chilled Water snnn.n °F EWT EWT
5 Leaving Chilled Water snnn.n °F LWT LWT
6 Control Point snnn.n °F CTRL PNT

CTRL PNT

7 Percent Total Capacity 0-100 % CAP T CAP T
8 Active Demand Limit 0-100 % DEM_LIM DEM_LIM
9 Operating Setpoint snnn.n °F SP SP

10 Circuit A Total Cap 0-100 % CAPA T

CAPA T

11 Circuit B Total Cap 0-100 % CAPB T CAPB T
12 Machine Starts nnnnn CY MACH CY MACH

73

CSM/FSM EQUIPMENT TABLE (Type 621H, Block 2)

LINE DESCRIPTION POINT

1 Chiller Status

0 = Chiller is off
1 = Valid run state in CCN mode
2 = Recycle active
3 = Chiller is in Local Mode
4 = Power Fail Restart in Progress
5 = Shutdown due to fault
6 = Communication Failure

CHILSTAT

2 unused
3 Percent Total Capacity Running CAP T
4 Service Runtime HR MACH
5 unused
6 unused
7 unused
8 Power Fail Auto Restart ASTART
9 Percent Available Capacity On CAP A

WSM EQUIPMENT PART COOL SOURCE MAINTENANCE TABLE

SUPERVISOR MAINTENANCE TABLE

DESCRIPTION STATUS POINT

WSM Active? Yes WSMSTAT
Chilled water temp 46.5 °F CHWTEMP
Equipment status On CHLRST
Commanded state Enable/Disable/None CHLRENA
CHW setpoint reset value 2.0 ^F CHWRVAL
Current CHW setpoint 44.0 °F CHWSTPT

OCCUPANCY MAINTENANCE TABLE

OCCUPANCY SUPERVISORY

DESCRIPTION STATUS POINT

Current Mode (1=Occup.) 0,1 MODE
Current Occup. Period # 0-8 PER-NO
Timed-Override in Effect Yes/No OVERLAST
Time-Override Duration 0-4 hours OVR HRS
Current Occupied Time 0:00 STRTTIME
Current Unoccupied Time 0:00 ENDTIME
Next Occupied Day NXTOCDAY
Next Occupied Time 0:00 NXTOCTIM
Next Unoccupied Day NXTUNDAY
Next Unoccupied Time 0:00 NXTUNTIM
Previous Unoccupied Day PRVUNDAY
Previous Unoccupied Time 0:00 PRVUNTIM

74

Copyright 1999 Carrier Corporation

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

Book 2
Tab 5c

PC 903 Catalog No. 533-099 Printed in U.S.A. Form 30GTN-1T Pg 76 5-99 Replaces: New

START-UP CHECKLIST FOR COMFORTLINK™ CHILLER SYSTEMS

(Remove and use for job file)

A. Preliminary Information

JOB NAME
LOCATION
INSTALLING CONTRACTOR
DISTRIBUTOR
START-UP PERFORMED BY

EQUIPMENT: Chiller: MODEL # SERIAL #

COMPRESSORS:

CIRCUIT A CIRCUIT B

1) M#

1) M#
S# S#
MTR# MTR#

2) M# 2) M#
S# S#
MTR# MTR#

3) M# 3) M#
S# S#
MTR# MTR#

4) M#
S#
MTR#

COOLER:

MODEL #

MANUFACTURED BY
SERIAL # DATE
TYPE OF EXPANSION VALVES (check one): EXV TXV

AIR-HANDLING EQUIPMENT:

MANUFACTURER
MODEL # SERIAL #
ADDITIONAL AIR-HANDLING UNITS AND ACCESSORIES

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

----------------------------------------------------------------------------------------

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

Book 2
Tab 5c

PC 903 Catalog No. 533-099 Printed in U.S.A. Form 30GTN-1T Pg CL-1 5-99 Replaces: New

B. Preliminary Equipment Check (YES or NO)

IS THERE ANY SHIPPING DAMAGE?

IF SO, WHERE

WILL THIS DAMAGE PREVENT UNIT START-UP?
HAVE COMPRESSOR BASE RAIL ISOLATORS ALL BEEN PROPERLYADJUSTED?
CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT?
HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? (refer to Installation Instructions)
ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? (refer to Installation Instructions)
HAS THE GROUND WIRE BEEN CONNECTED?
ARE ALL TERMINALS TIGHT?

CHECK AIR SYSTEMS (YES or NO)
ARE ALLAIR HANDLERS OPERATING?

(refer to air-handling equipment Installation and Start-Up Instructions)

ARE ALL CHILLED FLUID VALVES OPEN?
IS THE FLUID PIPING CONNECTED PROPERLY?
HAS ALL AIR BEEN VENTED FROM THE COOLER LOOP?
IS THE CHILLED WATER (FLUID) PUMP (CWP) OPERATING?
IS THE CWP ROTATION CORRECT?
CWP MOTOR AMPERAGE: Rated Actual

C. Unit Start-Up (insert check mark as each item is completed)

CHECK THAT THE CHILLER HAS BEEN PROPERLYINTERLOCKEDWITHTHEAUXILIARY CONTACTSOFTHECHILLED
FLUID PUMP STARTER.

ASSURE THAT THE UNIT IS SUPPLIED WITH CORRECT CONTROL VOLTAGE POWER.

(115 V FOR 208/230, 460, AND 575 V UNITS; 230 V FOR 380 AND 380/415 UNITS)
ASSURE CRANKCASE HEATERS HAVE BEEN ENERGIZED FOR A MINIMUM OF 24 HOURS PRIOR TO START-UP.
ASSURE COMPRESSOR OIL LEVEL IS CORRECT.
ASSURE BOTH LIQUID LINE SERVICE VALVES ARE BACKSEATED.
ASSURE ALL COMPRESSOR DISCHARGE SERVICE VALVES ARE BACKSEATED.
ASSURE ALL COMPRESSOR SUCTION SERVICE VALVES ARE BACKSEATED.
LOOSEN COMPRESSOR SHIPPING HOLDDOWN BOLTS.
LEAK CHECK THOROUGHLY: CHECK ALL COMPRESSORS, CONDENSER MANIFOLDS AND HEADERS, EXVs, TXVs,

SOLENOID VALVES, FILTER DRIERS, FUSIBLE PLUGS, THERMISTORS, AND COOLER HEADS, WITH GE H-10-B
ELECTRONIC LEAK DETECTOR.

LOCATE, REPAIR, AND REPORT ANY R-22 LEAKS.

CL-2

C. Unit Start-Up (cont)

CHECK VOLTAGE IMBALANCE: AB AC BC

AB + AC + BC (divided by 3) = AVERAGE VOLTAGE = V
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =

(MAX. DEVIATION)

VOLTAGE IMBALANCE = x 100 = % VOLTAGE IMBALANCE

AVERAGE VOLTAGE

IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START CHILLER!
CALL LOCAL POWER COMPANY FOR ASSISTANCE.

ASSURE THAT INCOMING POWER VOLTAGE TO CHILLER MODULES IS WITHIN RATED UNIT VOLTAGE
RANGE.

SYSTEM FLUID VOLUME IN LOOP: TYPE SYSTEM:

AIR CONDITIONING — MINIMUM 3 GALPERNOMINAL TON(3.25L PERkW) = GAL (L)
PROCESS COOLING — MINIMUM6GALPER NOMINALTON (6.50 LPERkW) =

GAL (L)

CHECK PRESSURE DROP ACROSS COOLER.

FLUID ENTERING COOLER:

PSIG (kPa)

FLUID LEAVING COOLER:

PSIG (kPa)
(PSIG DIFFERENCE) x 2.31 = FT OF FLUID PRESSURE DROP =
PLOT COOLER PRESSURE DROP ON PERFORMANCE DATA CHART (LOCATED IN PRODUCT DATA

LITERATURE) TO DETERMINE TOTAL GPM (L/s).
TOTAL GPM (L/s) =

UNIT’S RATED MIN GPM (L/s) =

GPM (L/s) PER TON = UNIT’S RATED MIN PRESSURE DROP =

(Refer to product data literature.)
JOB’S SPECIFIED GPM (L/s) (if available):
NOTE: IF UNIT HAS LOW FLUID FLOW, FIND SOURCE OF PROBLEM: CHECK FLUID PIPING, IN-LINE FLUID

STRAINER, SHUT-OFF VALVES, CWP ROTATION, ETC.

COOLER LOOP PROTECTION IF REQUIRED:

GALLONS (LITERS) OF BRINE ADDED:
PIPING INCLUDES ELECTRIC TAPE HEATERS (Y/N):

VISUALLY CHECK MAIN BASE BOARD AND EXV BOARD FOR THE FOLLOWING:

INSPECT ALL THERMISTORS AND EXV CABLES FOR POSSIBLE CROSSED WIRES.
CHECK TO BE SURE ALL WELL-TYPE THERMISTORS ARE FULLY INSERTED INTO THEIR RESPECTIVE

WELLS.
ARE ALL CABLES AND PIN CONNECTORS TIGHT? (Y/N)

ARE EXV, EMM, AND CXB BOARDS (IF INSTALLED) AND DISPLAY CONNECTIONS TIGHT?

CL-3

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----------------------------------------------------------------------------------------

C. Unit Start-Up (cont)

TO START THE CHILLER: (insert check mark as each item is completed)

TURN THE EMERGENCY ON/OFF SWITCH (SW2) TO ON POSITION.
LEAVE THE ENABLE/OFF/REMOTE CONTACT SWITCH (SW1) IN THE OFF POSITION.

NOTE: USE ESCAPE KEY TO GO UP ONE LEVEL IN THE STRUCTURE.
USE ARROW/ESCAPE KEYS TO ILLUMINATE CONFIGURATION LED. PRESS ENTER KEY AND ‘DISP’ WILL BE

DISPLAYED. PRESS DOWN ARROW KEY TO DISPLAY ‘UNIT’. PRESS ENTER KEY. RECORD CONFIGURATION
INFORMATION BELOW:

UNIT (Configuration Settings)

DESCRIPTION STATUS DEFAULT UNITS VALUE

Unit Type 1 = Air Cooled

2 = Water Cooled
3 = Split System
4 = Heat Machine
5 = Air Cooled Heat Reclaim

1

Unit Size 15 to 300 20 TONS
Circuit A1% Capacity 0 to 100 50 %
Number Circ A Compressor 1to4 1
Compressor A1 Cylinders 4or6 6
Number Circ B Compressor 1to4 1
Compressor B1 Cylinders 4or6 6
EXV Module Installed No/Yes Yes
EXV Superheat Setpoint 10 to 40 29.0 ^F
EXV Superheat Offset −20to20 0.0 ^F
EXV Circ. A Min Position 0 to 100 8.0 %
EXV Circ. B Min Position 0 to 100 8.0 %
Refrigerant 1 = R22

2 = R134A

1

Fan Staging Select 1 = 2 Stage indpt.

2 = 3 Stage indpt.
3 = 2 Stage common
4 = 3 Stage common

1

PRESS ESCAPE KEY TO DISPLAY ‘UNIT’. PRESS DOWN ARROW KEY TO DISPLAY ‘OPT1’.
PRESS ENTER KEY. RECORD CONFIGURATION INFORMATION BELOW:

OPTIONS1 (Options Configuration)

DESCRIPTION STATUS DEFAULT VALUE

Cooler Fluid 1 = Water

2 = Med. Brine
3 = Low Brine

1

Hot Gas Bypass Select No/Yes No
Head Press. Cont. Method 1 = EXV controlled

2 = Setpoint controlled
3 = Setpoint-A, EXV-B
4 = EXV-A, Setpoint-B

2

Head Press. Control Type 0 = None

1 = Air Cooled
2 = Water Cooled

0

Pressure Transducers No/Yes No
Cooler Pump Interlock Off/On On
Cooler Pump Control Off/On Off
No. Circuit A Unloaders 0-2 1
No. Circuit B Unloaders 0-2 1
EMM Module Installed No/Yes No

CL-4

C. Unit Start-Up (cont)

PRESS ESCAPE KEY TO DISPLAY ‘OPT1’. PRESS DOWN ARROW KEY TO DISPLAY ‘OPT2’. PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW.

OPTIONS2 (Options Configuration)

DESCRIPTION STATUS DEFAULT UNITS VALUE

Control Method 0 = Switch

1 = 7 day sched.
2 = Occupancy
3 = CCN

0

CCN Address 1 to 239 1
CCN Bus Number 0 to 239 0
CCN Baud Rate 1 = 2400

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

3

Loading Sequence Select 1 = Equal loading

2 = Staged loading

1

Lead/Lag Sequence Select 1 = Automatic

2 = Circuit A leads
3 = Circuit B leads

1

High LCW Alert Limit 2 to 60 60.0 ^F
Minutes off time 0to15 0 min

PRESS ESCAPE KEY TO DISPLAY ‘OPT2’. PRESS DOWN ARROW KEY TO DISPLAY ‘RSET’. PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW:

RESETCON (Temperature Reset and Demand Limit)

DESCRIPTION STATUS DEFAULT UNITS VALUE

COOLING RESET

Cooling Reset Type 0 = No Reset

1 = 4-20 ma input
2 = External temp-OAT
3 = Return fluid
4 = External temp-SPT

0

No Cool Reset Temp 0 to 125 0.0 °F
Full Cool Reset Temp 0 to 125 125.0 °F
Degrees Cool Reset −30 to 30 0.0 ^F

DEMAND LIMIT

Demand Limit Select 0 = None

1 = External switch input
2 = 4-20 ma input
3 = Loadshed

0

Demand Limit at 20mA 0 to 100 100 %
Loadshed Group Number 0to99 0
Loadshed Demand Delta 0to60 0 %
Maximum Loadshed Time 0 to 120 60 min
Demand Limit Switch 1 0 to 100 80 %
Demand Limit Switch 2 0 to 100 50 %

LEAD/LAG

Lead/Lag Enable Enable/Disable Disable
Master/Slave Select Slave/Master Master
Slave Address 0 to 239 0
Lead/Lag Balance Select Enable/Disable Disable
Lead/Lag Balance Delta 40 to 400 168 hours
Lag Start Delay 0 to 30 5 mins

CL-5

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----------------------------------------------------------------------------------------

C. Unit Start-Up (cont)

PRESS ESCAPE KEY TO DISPLAY ‘RSET’. PRESS DOWN ARROW KEY TO DISPLAY ‘SLCT’. PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW:

SLCT (Cooling Setpoint Select)

DESCRIPTION STATUS DEFAULT UNITS VALUE

Cooling Setpoint Select 0 = Single

1 = Dual Switch
2 = Dual Clock
3=4to20mAInput

0

Ramp Load Select Enable/Disable Enable
Cooling Ramp Loading 0.2 to 2.0 1.0
Deadband Multiplier 1.0 to 4.0 1.0

PRESS ESCAPE KEY SEVERAL TIMES TO GET TO THE MODE LEVEL (BLANK DISPLAY). USE THE ARROW KEYS
TO SCROLL TO THE SET POINT LED. PRESS ENTER TO DISPLAY SETPOINTS. RECORD CONFIGURATION
INFORMATION BELOW:

SETPOINT

DESCRIPTION STATUS UNITS DEFAULTS VALUE

COOLING

Cool Setpoint 1 −20 to 70 °F 44
Cool Setpoint 2 −20 to 70 °F 44

RAMP LOADING

Cooling Ramp Loading 0.2 to 2.0 °F/min 1.0

HEAD PRESSURE

Head Press. Stpt A 80 to 140 °F 113
Head Press. Stpt B 80 to 140 °F 113

USE ARROW/ESCAPE KEYS TO ILLUMINATE TEMPERATURES LED. PRESS ENTER TO DISPLAY ‘UNIT’. PRESS
ENTER AND USE THE ARROW KEYS TO RECORD TEMPERATURES FOR T1 AND T2 BELOW. RECORD T9 AND T10
IF INSTALLED. PRESS ESCAPE TO DISPLAY ‘UNIT’ AGAIN AND PRESS THE DOWN ARROW KEY TO DISPLAY
‘CIR.A’. PRESS ENTER AND USE THE ARROW KEYS TO RECORD TEMPERATURES FOR T3, T5 AND T7 BELOW.
PRESS ESCAPE TO DISPLAY ‘CIR.A’AGAIN AND PRESS THE DOWN ARROW KEY TO DISPLAY ‘CIR.B’. PRESS
ENTER AND USE THE DOWN ARROW KEYS TO RECORD TEMPERATURES FOR T4, T6 AND T8 BELOW. USING A
DC VOLTMETER, MEASURE AND RECORD THE VOLTAGE FOR EACH THERMISTOR AT THE LOCATION SHOWN.

TEMPERATURE VDC BOARD LOCATION

T1 (CLWT)

MBB, J8 PINS 13,14
T2 (CEWT) MBB, J8 PINS 11,12
T3 (SCT.A)

MBB, J8 PINS 21,22
T4 (SCT.B) MBB, J8 PINS 15,16
T5 (SST.A) MBB, J8 PINS 24,25 (EXV UNITS ONLY)
T6 (SST.B)

MBB, J8 PINS 18,19 (EXV UNITS ONLY)
T7 (SGT.A) EXV, J5 PINS 11,12 (EXV UNITS ONLY)
T8 (SGT.B) EXV, J5 PINS 9,10 (EXV UNITS ONLY)
T9 (OAT)

MBB, J8 PINS 7,8
T10 (SPT) MBB, J8 PINS 5,6

CL-6

C. Unit Start-Up (cont)

USE ESCAPE/ARROW KEYS TO ILLUMINATE CONFIGURATION LED. PRESS ENTER TO DISPLAY ‘DISP’. PRESS
ENTER AGAIN TO DISPLAY ‘TEST’ FOLLOWED BY ‘OFF’. PRESS ENTER TO STOP DISPLAY AT ‘OFF’ AND ENTER
AGAIN SO ‘OFF’ DISPLAY FLASHES. ‘PASS’ AND ‘WORD’ WILL FLASH IF PASSWORD NEEDS TO BE ENTERED.
PRESS ENTER TO DISPLAY PASSWORD FIELD AND USE THE ENTER KEY FOR EACH OF THE FOUR PASSWORD
DIGITS. USE ARROW KEYS IF PASSWORD IS OTHER THAN STANDARD. AT FLASHING ‘OFF’ DISPLAY, PRESS THE
UP ARROW KEY TO DISPLAY ‘ON’ AND PRESS ENTER. ALL LED SEGMENTS AND MODE LEDS WILL LIGHT UP.
PRESS ESCAPE TO STOP THE TEST. PRESS ESCAPE TO RETURN TO THE ‘DISP’ DISPLAY. PRESS THE ESCAPE
KEY AGAIN AND USE THE ARROW KEYS TO ILLUMINATE THE SERVICE TEST LED. PRESS ENTER TO DISPLAY
‘TEST’. PRESS ENTER TO STOP DISPLAY AT ‘OFF’ AND ENTER AGAIN SO ‘OFF’ FLASHES. PRESS THE UP ARROW
KEY AND ENTER TO ENABLE THE MANUAL MODE. PRESS ESCAPE AND DISPLAY NOW SAYS ‘TEST’ ‘ON’.

PRESSTHEDOWNARROW TODISPLAY ‘OUTS’. PRESSTHEENTERKEYTO DISPLAY‘FR.A1’. PRESS THE ENTER KEY
TO STOP DISPLAY AT ‘OFF’ AND ENTER AGAIN SO ‘OFF’ FLASHES. PRESS THE UP ARROW KEY AND ENTER TO
TURN THE OUTPUT ON. PRESS ENTER SO THE ‘ON’ DISPLAY FLASHES, PRESS THE DOWN ARROW KEY AND THEN
ENTER TO TURN THE OUTPUT OFF. OUTPUTS WILL ALSO BE TURNED OFF OR SENT TO 0% WHEN ANOTHER
OUTPUT IS TURNED ON. USE THE ARROW KEYS TO SELECT THE DESIRED PERCENTAGE FOLLOWED BY THE
ENTER KEY WHEN TESTING EXPANSIONVALVES. CHECK OFF THE FOLLOWING THATAPPLYAFTER BEING TESTED:

FR.A1

(CHECK ROTATION) FR.A2 (CHECK ROTATION)

EXV.A

FR.B1 (CHECK ROTATION)

FR.B2

(CHECK ROTATION) EXV.B

CLR.P (TB5-10,12) RMT.A TB5-11,12)

USE ESCAPE KEY TO RETURN TO ‘OUTS’ DISPLAY. PRESS DOWN ARROW TO DISPLAY ‘COMP’. PRESS ENTER
KEY TO DISPLAY ‘CC.A1’. NOTE THAT UNLOADERS AND HOT GAS BYPASS SOLENOIDS CAN BE TESTED
WITHOUT TURNING THE COMPRESSOR(S) ON. MAKE SURE ALL SERVICE VALVES ARE OPEN AND COOLER
PUMP HAS BEEN TURNED ON BEFORE STARTING COMPRESSORS. CHECK OFF EACH ITEM AFTER
SUCCESSFUL TEST: LEAD COMPRESSORS (A1/B1) WILL BE TURNED ON BEFORE ANY LAG COMPRESSORS CAN
BE STARTED. THE CONTROL WILL ONLY START ONE COMPRESSOR PER MINUTE. WHEN AT THE DESIRED ITEM,
PRESS THE ENTER KEY TWICE TO MAKE THE ‘OFF’ FLASH. PRESS THE UP ARROW KEY AND ENTER TO TURN
THE OUTPUT ON.

CC.A1

CC.A2
CC.A3 CC.A4
UL.A1 UL.A2
HGBP (IF INSTALLED)
CC.B1

CC.B2
CC.B3 CC.B4 N/A
UL.B1 UL.B2

TXV UNITS ONLY: CHECK AND ADJUST SUPERHEAT.

CL-7

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----------------------------------------------------------------------------------------

Copyright 1999 Carrier Corporation

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

Book 2
Tab 5c

PC 903 Catalog No. 533-099 Printed in U.S.A. Form 30GTN-1T Pg CL-8 5-99 Replaces: New