Carrier 040-420 specifications Example 1 Reading Alarm Codes, Operationat and Mode Display Codes

Page 37

STATUS FUNCTION - This function shows the rotating display, current status of alarm (diagnostic) codes, capacity stages, operating modes, chilled water set point, all meas- ured system temperatures and pressures, superheat values, pressure switch positions, analog inputs, and switch inputs .

These subfunctions are defined on pages 37 and 38.

i

m(R oFita t i n g D i s p l a y )

(AlarmFis) - Alarms are messages that one or more faults have been detected. Each fault is assigned a code num- ber which is reported with the alarm. See Table 10 for code definitions. The codes indicate failures that cause the unit to shut down, terminate an option (such as reset) or result in the use of a default value as set point.

Up to 5 alarm codes can be stored at once. To view them

in sequence, press mm to enter the alarm displays and then press q to move to the individual alarm dis-

plays. Press q after a code has been displayed. The mean- ing of the code scrolls across the screen. See Example 1

Example 1 - Reading Alarm Codes

K E Y P A D

DISPLAY

COMMENTS

 

ENTRY

RESPONSE

 

 

 

 

 

 

 

‘MvoEo;2;;5

Keypad has not been used for

 

 

at least 10 minutes. Alternating

 

0 STAGES

summary display appears on

 

2 ALARMS

screen

 

p-jq

2 ALARMS

2 alarms detected

 

cl

ALARM 9

First alarm code

 

+

 

EXPH

COOLER LEAVING

 

 

FLUID THERMISTOR

Explanation of alarm

code

0

FAILURE

 

 

4

ALARM 42

Second alarm code Cooler

Ll

 

freeze protection

 

EXPN

COOLER FREEZE

Explanation of alarm

code

0

PROTECTION

 

 

When a diagnostic (alarm) code is stored in the display and the machine automatically resets, the code is deleted. Codes for safeties which do not automatically reset are not deleted until the problem is corrected and the machine is switched to STOP, then back to LOCAL/ENABLE or CCN.

mbi (Modes) - The operating mode codes are dis- played to indicate the operating status of the unit at a given time. See Table 10.

Table 10 - Operationat 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

1

DESCRlPTlON

 

 

 

 

 

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

LOCAL OFF

in 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.

 

 

 

 

 

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

LOCAL ON

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

 

 

it will be in ON bosition.

CCN ON

Unit is on due to CCN command LOCAUENABLE-

STOP-CCN switch is in CCN position.

 

 

 

 

 

 

 

Unit is on due to internal clock schedule or occu-

CLOCK ON

pied override function. LOCALIENABLE-STOP-

 

 

CCN switch is in LOCAL position.

 

 

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

M O D E

7

ues to run in unoccupied condition, but leaving wa-

ter 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 water set

MODE 8

point upward, and unit is currently controlling to the

modified set point. The set point can be modified

 

 

 

 

based on return water, outdoor-air temperature or

 

 

space temperature

 

 

Demand limit is in effect. This indicates that ca-

 

 

pacity of unit is being limited by demand limit con-

MODE 9

trol option Because of this limitation, unit may

 

 

not be able to produce the desired leaving water

 

 

temperature

 

 

 

Load limit is in effect. This indicates that capacity of

 

 

a system of units is being limited by a CCN load-

MODE 10

shed command Due to this limitation, unit may

 

 

not be able to produce the desired leaving water

 

 

temperature.

 

MODE

II

Not aoalicable.I I

 

 

 

 

 

 

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

 

 

the r&e at which leaving water temperature is dropped

 

 

is limited to a predetermined value to prevent com-

MODE

12

pressor overloading, See CRAMP set point in the

 

 

SET function in Table 9 The pulldown limit can be

 

 

modified, if desired, to any rate from 2 F to 2 F

 

 

( lo to lo Q/minute

 

 

 

 

 

Timed override is in effect This is a 1 to 4 hour

 

 

temporary override of the programmed schedule,

MODE

13

forcing unit to occupied mode Override can be im-

 

 

plemented with unit under LOCAL 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

 

’water or 30” F

(16” C) for brine or more below l e a v -

 

ing fluid temperature, and saturated suction tem-

14perature is less than 32 F (0’ C). If these conditions persist beyond 10 minutes, circuit is shut down and fault code 44 or 45 is displayed.

CCN - CarrierComfort Network

To enter the MODES subfunction, depress MFI and use the q key to determine if more than one mode ap- plies. See Example 2 to read current mode with expansion.

37

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Contents Contrc Unit Model Unit Sizes and Modular CombinationsSource PSI Keypaddisplay Ground Fault InterrupterRELAY, B FieldCompressor Protection Control Module Cpcs LOCAL/ENABLE-STOP-CCN Switch Positions and OperationThermistor and Transducer Locations ThermistorsControl Steps CapacityLoading Sequence a Loading Sequence B Unit Control Steps060A\~**Hz Capacity Control Steps, 040-070 cantLoading Sequence a Loading Sequence B Unit Oy&ya Capacity Control Steps, 040-070 cantFBI 08Aqy,y AitiA4l&pi’ BP’ StepsLoading Loading Sequence B Unit Control Wtf2Z$’ Altt BittAltt Loading Sequence a Loading Equence B Unit’tt Amrox$-t&Z3 Loading Sequence a Quence B Unit Control Displacement Compressors UWrW Arwox A2.p $#l 110 50 HzAlt,Blv Loading Equence a Displacement Compressors MvroxEquence B 130, 24OA Awrox Drt,t130,24OA 130, 240ALoading Equence a Unit Attll’T3g A2.pLoading Sequence a Sequence B Unit $$V Control Size Steps LOAD11Loadin Sequence B Unit 8514w Displacement Compressors UVvW PWproxB2,B3 Al% Al’,BILoading Sequence B Unit Capacity Control Steps, 225, 250,280 30GT Displacement Compressors AwoxLoac \IG Sequence a Loading Sequence B Unit Loac Capacity Control Steps, 225, 250,280 cant30GT 250 Capacity Control Steps, 225, 250, 280 cant1G Sequence a Loading Sequence B Unit ControlFAN Arrangement FAN Numbers Contactor Controlled Condenser Fan SequenceFAN Arrangement FAN Numbers Condenser Fan Sequence cant~jACToR 30GT250 60 HzKeypad and Display Module Usage Keypad and Display Module Also Called HsioFunctions and Subfunctions Accessing Functions and SubfunctionsFunctions Operation Keypad Display Description Entry ResponseKeypad Directory Subfunction Keypadentry Display Comment Keypad Directory cant Status cantPressure AnalogSubfunction Keypad Entry Display Comment Outputs Subfunction Outputs DisplayOutputs HgbraSubfunction Keypad Entry Display Comment Override Keypad Directory cant Test cantClock Select QzqKeypad Directory Schedule cant Keypad Directory cant Service cord Keypad Directory cant Operationat and Mode Display Codes Example 1 Reading Alarm CodesExample 2 Reading Current Operating Modes Local on Cool Alarms Modes Local on M O D EKeypad Display Example 4 Reading and Changing Chilled Water Set Point Example 3 Using Test FunctionKeypad Display Comments Entry Response Keypad Display Comments Example 5 Using Return Water Temperature ResetCRST2 CrstiReset Reference Temperature Outdoor AIR 1OR Space Temp Example 6 Changing Reset TypeEKE FLD CFG Ertyp Lstyp Demand Keypad Display Entry ResponsePpiq Demand Limiting Example 8 Setting Time of Day Day of WeekMAX Demand Kimax = Adjustable Field Configurations Factory Configuration KeystrokesDisplay Example 9 Using the Schedule FunctionExample 10 Holiday Schedule Function Example 9 Using the Schedule Function cantComplete Unit Stoppage Complete unit stop Typical Stoppage Faults and Reset TypesAction Taken Probable Cause N T R O L Alarm CodesPage Page R ’ S ’ SlTnanz CGF SwitchCompressor Contactor Relay SNBFig. IOD 24-V Safety Circuit Wiring 225, 250, and 280 Units Electronil c Expansion Valve EXV Page Thermistor and Pressure Transducer Locations Suction Refrigerant Temperature Sensor T7, T8 040-210Associated Modular Units Pressure Transducer 2i.b Voltage Resistance Drop Voltage DropLine Transducer Each Compressor Equalizer OIL Pressure Suction Pressure Sight GlassPSIO, SIO Address Selector Control ModulesProcessor Module Psio Sensor Bus Wiring CommunicationsComm Troubleshooting 1NO. of Accessory Standard and Accessory UnloadersCircuit Circuit B Or2 30GN190-210 3OGT225,250,280 080-110 SO/SO Hz and 130 60 Hz Accessory Unloader Control WiringTLN HgbprLmyTEF4 Contactor Switch Circuit Breaker TransformerModule STAGE2J7-15 ModuleThermistor ElJ7-16Remote Dual Set Point Control InstallationPage Page Copyright 1994 Carrier Corporation

040-420 specifications

The Carrier 040-420 is a highly regarded commercial HVAC unit specifically designed for efficient heating and cooling in medium- to large-sized buildings. Known for its reliability and advanced technology, this system is ideal for a variety of applications ranging from offices to industrial spaces.

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