Carrier Air Conditioner Operation manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903 Catalog No. 563-025 Printed in U.S.A. Form 30GTN-3T Pg 1 3-00 Replaces: 30GTN-2T
Book 2
Ta b 5 c
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 service mechanics should in-
stall, 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 han-
dling all electrical components. CONTENTS Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3
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 Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Control Module Communication. . . . . . . . . . . . . . . . . . 4
Carrier Comfort Network Interface . . . . . . . . . . . . . . . 4
OPERATING DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-47
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 Ground Current Protection Board
(CGF) and Control Relay (CR) . . . . . . . . . . . . . . . . . 15
Electronic Expansion Valve (EXV) . . . . . . . . . . . . . . . 16
Energy Management Module . . . . . . . . . . . . . . . . . . . . 16
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• ADDING ADDITIONAL UNLOADERS
• MINUTES LEFT FOR START
• MINUTES OFF TIME
• LOADING SEQUENCE
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation and ser-
vice. 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 com-
ponents, or to bypass or otherwise depart from recom-
mended 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 solu-
tions in cooler 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 accor-
dance 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 concen-
trations of vapor is harmful and may cause heart irregulari-
ties, unconsciousness or death. Misuse can be fatal. Vapor
is heavier than air and reduces the amount of oxygen avail-
able 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 refrig-
erant 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.
30GTN,GTR040-420
30GUN,GUR040-420
Air-Cooled Reciprocating Liquid Chillers
with ComfortLink™ Controls
50/60 Hz

2
CONTENTS (cont)
Page
• LEAD/LAG DETERMINATION
• CAPACITY SEQUENCE DETERMINATION
• CAPACITY CONTROL OVERRIDES
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
Cooling Set Point (4 to 20 mA). . . . . . . . . . . . . . . . . . . 45
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
• DEMAND LIMIT (2-Stage Switch Controlled)
• EXTERNALLY POWERED DEMAND LIMIT
(4 to 20 mA Controlled)
• DEMAND LIMIT (CCN Loadshed Controlled)
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 47-52
Compressor Protection Control System
(CPCS) Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Compressor Ground Current (CGF) Board
(30GTN,R and 30GUN,R130-210, 230A-315A,
and 330A/B-420A/B) . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
EXV Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
• 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53-65
Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 53
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• COMPRESSOR REMOVAL
• OIL CHARGE
Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
•COOLERREMOVAL
• REPLACING COOLER
• SERVICING THE COOLER
Condenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Condenser Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Refrigerant Feed Components. . . . . . . . . . . . . . . . . . . 58
• ELECTRONIC EXPANSION VALVE (EXV)
• MOISTURE-LIQUID INDICATOR
• FILTER DRIER
• LIQUID LINE SOLENOID VALVE
• LIQUID LINE SERVICE VALVE
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
•LOCATION
• REPLACING THERMISTOR T2
• REPLACING THERMISTORS T1,T5,T6,T7, AND T8
• THERMISTORS T3 AND T4
• THERMISTOR/TEMPERATURE SENSOR CHECK
Page
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
• COMPRESSOR PROTECTION
• LOW OIL PRESSURE PROTECTION
• CRANKCASE HEATERS
• COOLER PROTECTION
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• HIGH-SIDE PROTECTION
• LOW-SIDE PROTECTION
• PRESSURE RELIEF VALVES
Other Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
START-UP AND OPERATION. . . . . . . . . . . . . . . . . . 66,67
Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
• TEMPERATURES
• VOLTAGE
• MINIMUM FLUID LOOP VOLUME
• FLOW RATE REQUIREMENTS
Operation Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Refrigerant Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
FIELD WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67-70
APPENDIX A — CCN TABLES . . . . . . . . . . . . . . . . 71-79
APPENDIX B — FLUID PRESSURE DROP
CURVES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80-87
START-UP CHECKLIST . . . . . . . . . . . . . . . . .CL-1 to CL-8
GENERAL
The model 30GTN,R chillers are air-cooled chillers utiliz-
ing refrigerant R-22. The model 30GUN,R chillers are air-
cooled chillers utilizing refrigerant R-134a.
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 mod-
ules. See Tables 1A and 1B for a listing of unit sizes and modu-
lar 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, Oper-
ation, and Troubleshooting information for the 30GTN,R040-
420 and 30GUN,R040-420 liquid chillers with ComfortLink
controls.
The 30GTN,R and 30GUN,R040-420 chillers are equipped
with electronic expansion valves (EXVs) or, on size 040-110
FIOP (factory-installed option) units, conventional thermostat-
ic 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.

3
Table 1A — Unit Sizes and Modular Combinations
(30GTN,R)
*60 Hz units/50 Hz units.
Table 1B — Unit Sizes and Modular Combinations
(30GUN,R)
*60 Hz units/50 Hz units.
MAJOR SYSTEM COMPONENTS
General — The 30GTN,R and 30GUN,R air-cooled recip-
rocating 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 com-
munication bus or LEN (Local Equipment Network). The
CCN (Carrier Comfort Network) bus is also supported. Con-
nections to both LEN and CCN buses are made at TB3. See
Fig. 5.
Expansion Valve (EXV) Board — The electronic ex-
pansion 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 main-
tain the correct compressor superheat.
Compressor Expansion Board (CXB) — The
CXB is included as standard on sizes 150-210 (60 Hz) and 130
(50 Hz) and associated modular units. The compressor expan-
sion board (CXB) receives the feedback inputs from compres-
sors A3, B3 and A4. See Table 3. The CXB board communi-
cates the status to the MBB and controls the outputs for these
compressors. An additional CXB is required for unit sizes 040-
110, 130 (60 Hz), 230B-315B with additional unloaders.
Scrolling Marquee 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) dis-
play. 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
field-installed 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/Remote Contact Switch — The
Enable/Off/Remote Contact switch is a 3-position switch used
to control the chiller. When switched to the Enable position the
chiller is under its own control. Move the switch to the Off po-
sition 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 appli-
cation capable of handling a 24 vac load. In the Enable and Re-
mote Contact (dry contacts closed) positions, the chiller is al-
lowed 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 off immediately. 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.
Board Addresses — The Main Base Board (MBB) has
a 3-position Instance jumper that must be set to ‘1.’ All other
boards have 4-position DIP switches. All switches are set to
‘On’ for all boards.
UNIT
30GTN,R
NOMINAL
TONS
SECTION A
UNIT 30GTN,R
SECTION B
UNIT 30GTN,R
040 40 — —
045 45 — —
050 50 — —
060 60 — —
070 70 — —
080 80 — —
090 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
UNIT
30GUN,R
NOMINAL
TONS
SECTION A
UNIT 30GUN,R
SECTION B
UNIT 30GUN,R
040 26 — —
045 28 — —
050 34 — —
060 42 — —
070 48 — —
080 55 — —
090 59 — —
100 66 — —
110 72 — —
130 84 — —
150 99 — —
170 110 — —
190 122 — —
210 134 — —
230 154 150 080
245 158 150 090
255 165 150 100
270 176 170 100
290 193 190 110
315 206 210 110
330 219 170 170
360 243 190 190/170*
390 256 210 190
420 268 210 210

4
Control Module Communication
RED LED — Proper operation of the control boards can be
visually checked by looking at the red status LEDs (light-
emitting diodes). When operating correctly, the red status
LEDs should be blinking in unison at a rate of once every
2 seconds. If the red LEDs are not blinking in unison, verify
that correct power is being supplied to all modules. Be sure that
the Main Base Board (MBB) is supplied with the current soft-
ware. If necessary, reload current software. If the problem still
persists, replace the MBB. A red LED that is lit continuously or
blinking at a rate of once per second or faster indicates that the
board should be replaced.
GREEN LED — The MBB has one green LED. The Local
Equipment Network (LEN) LED should always be blinking
whenever power is on. All other boards have a LEN LED
which should be blinking whenever power is on. Check LEN
connections for potential communication errors at the board J3
and/or J4 connectors. Communication between modules is ac-
complished by a 3-wire sensor bus. These 3 wires run in paral-
lel from module to module. The J4 connector on the MBB pro-
vides 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. The communication bus wiring is a shielded,
3-conductor cable with drain wire and is supplied and installed
in the field. The system elements are connected to the commu-
nication bus in a daisy chain arrangement. The positive pin of
each system element communication connector must be wired
to the positive pins of the system elements on either side of it.
This is also required for the negative and signal ground pins of
each system element. Wiring connections for CCN should be
made at TB3. Consult the CCN Contractor’s Manual for fur-
ther information.
NOTE: Conductors and drain wire must be 20 AWG (Amer-
ican Wire Gage) minimum stranded, tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon, or polyethylene. An aluminum/polyester 100% foil
shield and an outer jacket of PVC, PVC/nylon, chrome vinyl,
or Teflon with a minimum operating temperature range of
–20 C to 60 C is required. Wire manufactured by Alpha (2413
or 5463), American (A22503), Belden (8772), or Columbia
(02525) meets the above mentioned requirements.
It is important when connecting to a CCN communication
bus that a color coding scheme be used for the entire network
to simplify the installation. It is recommended that red be used
for the signal positive, black for the signal negative, and white
for the signal ground. Use a similar scheme for cables contain-
ing 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 commu-
nication bus cable exits from one building and enters another,
the shields must be connected to grounds at the lightning sup-
pressor 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 appropri-
ate 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).
Table 2 — Thermistor Designations
LEGEND
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.
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
Te m p e r a t u r e , C k t A
T4 J8-15,16 (MBB) Saturated Condensing
Te m p e r a t u r e , C k t 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 or Dual Chiller LWT
Sensors (Accessory)
T10 J8-5,6 (MBB) Remote Space Temperature
Sensor (Accessory)
EXV — Electronic Expansion Valve
MBB — Main Base Board

5
Table 3 — Status Switches
LEGEND *The OPS can also be added as an accessory.
†The CPCS can be added as an accessory.
Table 4 — Output Relay
LEGEND
OFM — Outdoor-Fan Motor
*And associated modular units.
†Field-installed accessory unloader.
LEGEND FOR FIG. 1-4
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
CPCS — Compressor Protection Control System
CR — Control Relay
CXB — Compressor Expansion Board
MBB — Main Base Board
OPS — Oil Pressure Switch, Circuit A or B
RELAY
NO. DESCRIPTION
K1(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*)
K2 (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*)
K3 (MBB) Energize Unloader A1 (040-170*)
No Action (190-210*)
K4 (MBB) Energize Unloader B1 (040-070†, 080-170*)
No Action (190,210*)
K5 (MBB) No Action (040-060, 50 Hz; 040-070, 60 Hz)
Energize Compressor A2 (070, 50 Hz; 080-210*)
K6 (MBB) No Action (040-080*)
Energize Compressor B2 (090-210*)
K7 (MBB) Alarm
K8 (MBB) Cooler Pump
K9 (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
K10 (MBB)
Energize Second 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
K11 (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
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
CWFS — Chilled Water Flow Switch
CWPI — Chilled Water Pump Interlock
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
LEN — Local Equipment Network
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

6
Fig. 1 — Typical Control Box (080-110 and Associated Modular Units Shown)

7
CCN
LEN
DATA
COMMUNICATION
PORT
Fig. 2 — 24 V Control Schematic, Unit Sizes 040-070

8
Fig. 3 — 24 V Control Schematic, Unit Sizes 080-110, 230B-315B
CCN
LEN
DATA
COMMUNICATION
PORT
/
Fig. 3 — 24 V Control Schematic, Unit Sizes 080-110, 230B-315B

9
CCN
LEN
DATA
COMMUNICATION
PORT
Fig. 4 — 24 V Control Schematic, Unit Sizes 130-210, 230A-315A, 330A/B-420A/B

10
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)
INSTANCE JUMPER
EMERGENCY ON/OFF
SWITCH
ENABLE/OFF/REMOTE
CONTACT SWITCH
GFI-CONVENIENCE
OUTLET ACCESSORY
ON 208/230V 460 AND
575V ONLY
RESET BUTTON
(SIZES 130-210 AND
ASSOCIATED MODULES ONLY)
Fig. 5 — Main Base Board
Fig. 6 — Enable/Off/Remote Contact Switch, Emergency On/Off Switch,
and Reset Button Locations

11
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. 7-10 for
thermistor locations. Thermistors T1-T9 are 5 kΩat 77 F
(25 C). Thermistors T1, T2, T3-T6 and T7-T9 have different
temperature versus resistance and voltage drop performance.
Thermistor T10 is 10 kΩat 77 F (25 C) and has a different tem-
perature vs resistance and voltage drop performance. See Ther-
mistors section on page 59 for temperature-resistance-voltage
drop characteristics.
T1 — COOLER LEAVING FLUID SENSOR — This ther-
mistor is located in the leaving fluid nozzle. The thermistor
probe is inserted into a friction-fit well.
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 SEN-
SORS — These thermistors are located next to the refrigerant
inlet in the cooler head, and are inserted into a friction-fit 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 TEMPERA-
TURE SENSORS — These thermistors are located in the lead
compressor in each circuit in a suction passage after the refrig-
erant has passed over the motor and is about to enter the cylin-
ders. 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.
MIN. 6”OF 22 AWG WIRES
WITH ENDS STRIPPED BACK
.25”±1/8”
1/2”PVC SHIELD
1/2 NPT MALE
THREADED ADAPTER
3/16”DIA.
THERMOWELL (S.S.)
REF.
.83 D
(21.1)
REF.
1.81
(46.0)
REF.
5.75
(146.1
LEGEND
*And associated modular units.
AWG — American Wire Gage
EXV — Electronic Wire Gage
Fig. 7 — Cooler Thermistor Locations and Accessory Outdoor-Air Temperature Sensor Detail
040-110*
130-210*

12
*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
040-070
080-110 AND ASSOCIATED MODULAR UNITS* 130-210 AND ASSOCIATED MODULAR UNITS*

13
Fig. 9 — Compressor Thermistor Locations (T7 and T8)
LEGEND
EXV — Electronic Expansion Valve
Fig. 10 — Typical Thermistor Location (30GTN,R and 30GUN,R 210, 315A, 390A, 420A/B Shown)

14
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 ter-
minals in the unit main control box. The space temperature
sensor includes a terminal block (SEN) and a RJ11 female con-
nector. The RJ11 connector is used to tap into the Carrier Com-
fort Network (CCN) at the sensor.
To connect the space temperature sensor (Fig. 11):
1. Using a 20 AWG (American Wire Gage) twisted pair
conductor cable rated for the application, connect 1
wire of the twisted pair to one SEN terminal and con-
nect 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):
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.
IMPORTANT: The cable selected for the RJ11 connec-
tor wiring MUST be identical to the CCN communica-
tion 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 —
SPT (T10) PART NO. HH51BX006
SENSOR
SEN SEN TB5
5
6
T-55 SPACE
SENSOR
CCN+
CCN GND
CCN-
TO CCN
TERMINALS
ON TB3
AT UNIT
1
2
3
4
5
6
Fig. 11 — Typical Space Temperature
Sensor Wiring
Fig. 12 — CCN Communications Bus Wiring
to Optional Space Sensor RJ11 Connector

15
Thermostatic Expansion Valves (TXV) — Model
30GTN,R and 30GUN,R 040-110 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
valvetopumpdownthesystem.
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
metering the proper amount of refrigerant into the cooler. All
TXVs are adjustable, but should not be adjusted unless abso-
lutely 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
[CPCS — Standard on Sizes 080-110 and
Optional on Sizes 040-070]) or Control Relay
(CR) — 30GTN,R and 30GUN,R 040-110 — 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 pro-
vide 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 oper-
ating properly through the signal contacts, it will lock the com-
pressor 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.
A high-pressure switch is wired in series between the MBB
and the CR or CPCS. On compressor A1 and B1 a loss-of-
charge 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-of-charge 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,R and 30GUN,R 130-210, and associated modular
units (see Table 1) contain one compressor ground current pro-
tection board (CGF) (see Fig. 14) 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 oth-
er compressors in that circuit.
A high-pressure switch is wired in series between the MBB
and the CR. On compressor A1 and B1 a loss-of-charge switch
is also wired in series 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 com-
pressor, the CR relay is deenergized, stopping the compressor
and signaling the processor at 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-of-charge switch, all compressors
in that circuit are also shut down.
Fig. 13 —Compressor Protection Control
System Module —Sizes 040-110
Fig. 14 —Compressor Ground Fault Module
—Sizes 130-210

16
Electronic Expansion Valve (EXV) (See
Fig. 15) —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 bot-
tom of orifice assembly to complete a seal in the valve on shut-
down. 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 as-
sembly. 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 in-
crements controlled directly by the processor. As stepper motor
rotates, the motion is translated into linear 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 po-
sition 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 ther-
mistors 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) on 30GTN,R units and 16 F (8.9 C) on 30GUN,R
units, resulting in a superheat entering compressor cylinders of
approximately 29 F (16.1 C) for 30GTN,R units and 23 F
(12.8 C) for 30GUN,R units.
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. 16) —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 handling a 5 vdc, 1 to
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 mA load)
See Demand Limit and Temperature Reset sections on
pages 46 and 43 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 ca-
pacity stages. The chilled fluid temperature set point can be au-
tomatically 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 which circuit will start first, A or B. At the first call
for cooling, the lead compressor crankcase heater will be deen-
ergized, 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 to be installed on the B1 com-
pressor 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 re-
main at minimum position for 10 seconds before it is allowed
to modulate.
After the purge period, the EXV will begin to meter the re-
frigerant, 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 com-
pressor starts.
The EXVs will open gradually to provide a controlled start-
up to prevent liquid flood-back to the compressor. During start-
up, 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.
STEPPER
MOTOR (12 VDC)
ORIFICE ASSEMBLY
(INSIDE PISTON SLEEVE)
PISTON SLEEVE
LEAD SCREW
Fig. 15 —Electronic Expansion Valve (EXV)

17
The capacity control algorithm runs every 30 seconds. The
algorithm attempts to maintain the leaving chilled water tem-
perature at the control point. Each time it runs, the control reads
the entering and leaving fluid temperatures. The control deter-
mines the rate at which conditions are changing and calculates
2 variables based on these conditions. Next, a capacity ratio is
calculated using the 2 variables to determine whether or not to
make any changes to the current stages of capacity. This ratio
value ranges from –100 to + 100%. If the next stage of capacity
is a compressor, the control starts (stops) a compressor when
the ratio reaches +100% (–100%). If the next stage of capacity
is an unloader, the control deenergizes (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 af-
ter 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) ADDRESS
DIP SWITCH
Fig. 16 —Energy Management Module

18
Table 5A —Part Load Data Percent Displacement, Standard Units
*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.
UNIT
30GTN,R
30GUN,R
CONTROL
STEPS
LOADING SEQUENCE A LOADING SEQUENCE B
% Displacement
(Approx) Compressors % Displacement (Approx) Compressors
040 (60 Hz)
125A1*——
250A1——
375A1*,B1——
4 100 A1,B1 ——
040 (50 Hz)
045 (60 Hz)
124A1*——
247A1——
376A1*,B1——
4 100 A1,B1 ——
045 (50 Hz)
050 (60 Hz)
131A1*——
244A1——
387A1*,B1——
4 100 A1,B1 ——
050 (50 Hz)
060 (60 Hz)
128A1*——
242A1——
387A1*,B1——
4 100 A1,B1 ——
060 (50 Hz)
070 (60 Hz)
133A1*——
250A1——
383A1*,B1——
4 100 A1,B1 ——
070 (50 Hz)
119A1*——
227A1——
365A1*,B1——
473A1,B1——
5 92 A1*,A2,B1 ——
6 100 A1,A2,B1 ——
080, 230B (60 Hz)
1 22 A1* 30 B1*
234A144B1
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*
225A138B1
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*
227A127B1
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)
114A114B1*
221A121B1
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*
223A123A1
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

19
Table 5A —Part Load Data Percent Displacement, Standard Units (cont)
*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.
UNIT
30GTN,R
30GUN,R
CONTROL
STEPS
LOADING SEQUENCE A LOADING SEQUENCE B
% Displacement
(Approx) Compressors % Displacement (Approx) Compressors
100, 255B
270B (50 Hz)
1 13 A1* 13 B1*
220A120B1
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*
221A121B1
3 29 A1*,B1* 29 A1*,B1*
4 36 A1*,B1 36 A1,B1*
5 43 A1,B 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*
225A125B1
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 14 A1* 14 B1*
221A121B1
3 28 A1*,B1* 28 A1*,B1*
4 35 A1*,B1 35 A1,B1*
5 42 A1,B1 42 B1,B1
6 58 A1*,A2,B1* 58 A1*,B1*,B2
7 64 A1*,A2,B1 64 A1,B1*,B2
8 71 A1,A2,B1 71 A1,G1,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
130 (50 Hz)
1 10 A1* 16 B1*
214A125B1
3 26 A1*,B1* 26 A1*,B1*
4 35 A1*,B1 31 A1,B1*
5 39 A1,B1 39 A1,B1
6 44 A1*,A2,B1* 51 A1*,B1*,B2
7 53 A1*,A2,B1 56 A1,B1*,B2
8 57 A1,A2,B1 64 A1,B1,B2
9 69 A1*,A2,B1*,B2 69 A1*,A2,B1*,B2
10 78 A1*,A2,B1,B2 75 A1,A2,B1*,B2
11 82 A1,A2,B1,B2 82 A1,A2,B1,B2
12 87 A1*,A2,A3,B1*,B2 87 A1*,A2,A3,B1*,B2
13 96 A1*,A2,A3,B1,B2 91 A1,A2,A3,B1*,B2
14 100 A1,A2,A3,B1,B2 100 A1,A2,A3,B1,B2
150, 230A, 245A,
255A (60 Hz)
1 11 A1* 18 B1*
215A127B1
3 29 A1*,B1* 29 A1*,B1*
4 38 A1*,B1 33 A1,B1*
5 42 A1,B1 42 A1,B1
6 44 A1*,A2,B1* 55 A1*,B1*,B2
7 53 A1*,A2,B1 60 A1,B1*,B2
8 58 A1,A2,B1 69 A1,B1,B2
9 71 A1*,A2,B1*,B2 71 A1*,A2,B1*,B2
10 80 A1*,A2,B1,B2 75 A1,A2,B1*,B2
11 85 A1,A2,B1,B2 85 A1,A2,B1,B2
12 86 A1*,A2,A3,B1*,B2 86 A1*,A2,A3,1*,B2
13 95 A1*,A2,A3,B1,B2 91 A1,A2,A3,B1*,B2
14 100 A1,A2,A3,B1,B2 100 A1,A2,A3,B1,B2

20
Table 5A —Part Load Data Percent Displacement, Standard Units (cont)
*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.
UNITT
30GTN,R
30GUN,R
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