Carrier 30GN040-420 operating instructions Operational and Mode Display Codes

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Table 10 Ð Operational and Mode Display Codes

The operating modes are displayed by name or code num- ber, to indicate the operating status of the unit at a given time. The modes are:

CODE

DESCRIPTION

 

 

Unit is off. LOCAL/ENABLE-STOP-CCN switch is in

 

LOCAL OFF

OFF position, or LOCAL/ENABLE-STOP-CCN switch

may be in LOCAL position with external ON/OFF

 

 

switch in OFF position.

 

 

CCN OFF

Unit is off due to CCN network command. LOCAL/

 

ENABLE-STOP-CCN switch is in CCN position.

 

CLOCK OFF

Unit is off due to internal clock schedule. LOCAL/

 

 

ENABLE-STOP-CCN switch is in LOCAL position.

LOCAL ON

Unit is on. LOCAL/ENABLE-STOP-CCN switch is in

 

LOCAL position. If external ON/OFF switch is used,

 

it will be in ON position.

CCN ON

Unit is on due to CCN command. LOCAL/ENABLE-

 

STOP-CCN switch is in CCN position.

 

CLOCK ON

Unit is on due to internal clock schedule or occu-

 

pied override function. LOCAL/ENABLE-STOP-

 

CCN switch is in LOCAL/ENABLE position.

 

Dual set point is in effect. In this mode, unit contin-

 

MODE 7

ues to run in unoccupied condition, but leaving ¯uid

set point is automatically increased to a higher level

 

 

(CSP2 set point is in SET function).

 

 

 

Temperature reset is in effect. In this mode, unit is

 

 

using temperature reset to adjust leaving ¯uid set

MODE 8

point upward, and unit is currently controlling to the

modi®ed set point. The set point can be modi®ed based

 

 

on return ¯uid, outdoor-air temperature, or space tem-

 

perature.

 

Demand limit is in effect. This indicates that ca-

 

MODE 9

pacity of unit is being limited by demand limit control

option. Because of this limitation, unit may not

 

be able to produce the desired leaving ¯uid

 

temperature.

MODE 10

Flotronic™ System Manager (FSM) is controlling the

 

chiller.

 

MODE 11

Not applicable.

 

 

Ramp load (pulldown) limiting is in effect. In this mode,

 

 

the rate at which leaving ¯uid temperature is dropped

MODE 12

is limited to a predetermined value to prevent com-

pressor overloading. See CRAMP set point in the

 

SET function in Table 9. The pulldown limit can be

 

modi®ed, if desired, to any rate from .2 F to 2 F

 

(.1° to 1° C)/minute.

 

Timed override is in effect. This is a 1 to 4 hour tem-

 

MODE 13

porary override of the programmed schedule, forc-

ing unit to occupied mode. Override can be imple-

 

mented with unit under LOCAL/ENABLE or CCN

 

control. Override expires after each use.

 

Low cooler suction protection is in effect. In this mode,

 

 

circuit capacity is not allowed to increase if cooler

 

saturated suction temperature is 20° F (11° C) for

MODE 14

¯uid or 30° F (16° C) for brine or more below leaving

¯uid temperature, and saturated suction tempera-

 

 

ture is less than 32 F (0° C). If these conditions per-

 

sist beyond 10 minutes, circuit is shut down and fault

 

code 44 or 45 is displayed.

MODE 15

Water System Manager is controlling the chiller.

 

MODE 16

Slow change override is in effect.

 

MODE 17

X minute off-to-on delay is in effect.

 

MODE 18

Low suction superheat protection is in effect.

 

CCN Ð Carrier Comfort Network

(Set Point) Ð This subfunction displays leaving

¯uid temperature and leaving chilled ¯uid set point. If unit is programmed for dual set point, the chilled ¯uid set point currently in effect (either occupied or unoccupied) is displayed. If reset is in effect, the unit operates to the modi- ®ed chilled ¯uid set point. This means the leaving ¯uid tem- perature may not equal the chilled ¯uid set point. The modi®ed chilled ¯uid set point can also be displayed in the Status function. To enter the set point subfunction,

press and press to display the set point fol-

lowed by the modi®ed leaving chilled ¯uid set point and ac- tual control temperature.

(Temperature) Ð The temperature subfunction dis- plays the readings at temperature sensing thermistors.

To read a temperature, enter , then scroll to de-

sired temperature using the

key. See Table 9 for the

order of readouts. This subfunction also displays the satu- rated refrigerant temperatures corresponding to the suction and discharge pressures measured by the compressor transducers.

(Pressure) Ð This subfunction displays suction,

discharge, and net oil pressure at lead compressor of each circuit of unit.

(Analog Inputs) Ð This subfunction displays

analog inputs, if any. Press , then press . The

transducer supply voltage, 4-20 mA reset signal can be dis- played. This is useful for problem diagnosis prior to using the test function.

(Discrete Inputs) Ð This subfunction displays sta-

tus (open/closed) of discrete input switch where applicable. Status of dual set point switch and demand limit switches 1 and 2 can be displayed. This is useful for problem diagnosis prior to using the test function.

(Outputs) Ð This function displays on/off sta-

tus of alarm relay, all fan relays, and chilled water pump relay. It also displays on/off status of compressor unloaders (if used). The position of each EXV (in percent open) can be displayed.

TEST FUNCTION Ð The test function operates the diag- nostic program. To initiate test function, the LOCAL/ ENABLE-STOP-CCN switch must be in STOP position.

To reach a particular test, press its subfunction number,

then scroll to desired test by pressing . Press to

start a test. Press or or to terminate or exit a

test. Pressing the key after a test has started advances

system to next test, whether current test is operating or has timed out. Once in the next step, you may start

test by pressing or advance past it by pressing .

While the unit is in test, you may leave test function and access another display or function by pressing appropriate keys. However, a component that is operating when an- other function is accessed remains operating. You must

re-enter test function and press to shut down the com-

ponent. Components with a timed operating limit time out normally even if another function is accessed.

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Contents Controls, Operation, Troubleshooting Unit Model Nominal Section a Section B Unit Sizes and Modular CombinationsTons Unit 30GN 30GN Control Panel 040-110 Unit Shown LOCAL/ENABLE LOCAL/ENABLE-STOP-CCN Switch Positions and OperationKeypad and Display Module Also Called Hsio StopThermistor and Transducer Locations Compressor Protection Control Module CpcsThermistors Pressure TransducersLoading Sequence a Loading Sequence B Unit Control Ð Capacity Control StepsSteps Ð Capacity Control Steps, 040-070 Ð Capacity Control Steps, 040-070 A1²,B1² Displacement Compressors Approx 080, 230B 60 HzA1²**, B1² A1²**,B1²090, 245B 60 Hz Compressors Displacement090, 245B 50 Hz 270B 60 Hz 100, 255B270B 50 Hz Unit Control Loading Sequence a Loading Sequence B315B 60 Hz 110, 290B315B 50 Hz A1*,A2,B1 A1,A2,B1 A1²²,A2,B1,B2 A1*,A2,B1,B2 130 60 Hz 150, 230A, 245A 130 50 HzA1,kB1 330A/B 60 Hz 170, 270A330A/B,360B 50 Hz 330A/B, 360B 50 Hz 390B 60 Hz Approx 190, 290A, 360A/BA1,B1 A1**,B1420A/B 60 Hz 210, 315A, 390A420A/B 50 Hz Pumpout Head Pressure ControlFAN Arrangement FAN Numbers FAN Contactor Controlled by Condenser Fan SequenceFunctions and Subfunctions Keypad and Display Module UsageFunction USE Keys Operative USE KeysKeypad Directory Accessing Functions and SubfunctionsKeypad Directory Status TemperatureSubfunction Keypad Entry Display Comment Stage SET PointAnalog Subfunction Keypad Entry Display Comment PressureInputs OutputsSubfunction Keypad Entry Display Comment Outputs Subfunction Keypad Entry Display CommentSubfunction Keypad Entry Display Comment Compressors Unloaders CPA1Keypad Directory Test Keypad Directory Schedule Configuration Keypad Directory ServiceService Subfunction Keypad Entry Display Comment FactorySubfunction Keypad Entry Display Comment RUN Time ALARM/ALERTStarts HISTORY²²Subfunction Keypad Entry Display Comment SET Points Reset SET PointsDemand SET Points Date and TimeExample 2 Ð Reading Current Operating Modes Example 1 Ð Reading Alarm CodesKeypad Display Comments Entry Response Operational and Mode Display Codes Reset Set Points Example 3 Ð Using Test FunctionReset Amounts Example 5A Ð External ResetExample 4 Ð Reading and Changing Chilled Fluid Set Point Measurement Method Input Data DescriptionKeypad Display Comments Entry Response Example 5C Ð Using Return Fluid Temperature ResetSwitch PowerComm Ð Communications Bus PWRPassword Service FunctionsSUB Keypad Display Comment LoggedonExample 8 Ð Setting Time of Day Day of Week To Disable Demand Limit4-20 mA Demand Limiting Factory Conguration Keystrokes Adjustable Field CongurationsKeypad Display Comment Entry Example 9 Ð Using the Schedule FunctionProgramming Period Keypad Display Comment Entry Programming PeriodEnter Display Example 10 Ð Holiday Schedule FunctionStop position. Unit cannot start if these contacts are Typical Stoppage Faults and Reset TypesLOCAL/ENABLE-STOP-CCN Alarm and Alert CodesFSM CpcsWSM DGT COM, CommDsio HPSComm CGF Subfunction. Groups Electronic Expansion Valve EXV EXV Cable Connections to EXV Driver Module, Dsio EXV Thermistor Replacement T1, T2, T7, T8 Temperature Voltage Resistance Drop Ohms Temperature Voltage Resistance Drop Thermistor and Pressure Transducer Locations Thermistor Locations Circuits a and B, Lead Compressor Only Lead Compressor Transducer and Thermistor Locations Control Modules Module Address Selector Switch LocationsAccessory Unloader Installation 4 In/4 Out Module SIO InstallationStandard and Accessory Unloaders TroubleshootingPage ²Or HGBPR-B Or HGBPR-AHgbpr Ð COMOutdoor-Air Temperature Externally PoweredCWP Ð Chilled Water Fluid Pump TB Ð Terminal BlockInterlocks Remote AlarmPage Copyright 1995 Carrier Corporation

30GN040-420 specifications

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