Carrier 040-420 Example 3 Using Test Function, Keypad Display Comments Entry Response

Page 39

 

Example 3 - Using Test Function

 

 

 

KEYPAD

DISPLAY

COMMENTS

ENTRY

I RESPONSE

 

C O M P Factory/field test of compressors subfunction of test function

CPA 1 OFF Circuit A, Compressor 1A test

CPA 1 ON Pressing ENTR starts the test:

when the compressor should be running the display shows CPA1 on

CPA 1 OFF If the test is allowed to time out (10 sec- onds) the display will show CPA1 off

cl+ CPA 2 OFF Pressing the down arrow key advances the system to Circuit A, compressor 2 test

 

NOTE: Once a compressor has been run using the EST

function, it

 

is not allowed to run again for 30 seconds.

E l

 

 

 

 

 

 

 

 

 

HISTORY FUNCTION - Keystrokes mb] and sub-

 

 

 

 

 

 

 

sequent [ keystrokes display total unit run time and total

 

run time for each circuit.

 

 

 

 

 

 

.

Keystrokes

 

m m

and subsequent m

keystrokes

dis-

 

play total unit

starts

and the total starts for each circuit.

 

Keystrokes

Fi b[ and

subsequent

q

keystrokes

dis-

play the last 5 alarms along with a description of each alarm.

SET POINT FUNCTION - Set points are entered through the keypad. Set points can be changed within the upper and lower limits, which are fixed. The ranges are listed below.

Chilled Water Set Point

Water:

38 to 70 F (3.3 to 21 C)

Brine:

15 to 70 F (-9.4 to 21 C)

Pulldown Set Point

0.2 to 2.0 F (0.11 to 1.1 C)/min.

Reset Set Points

Maximum Reset Range:

0” to 20” F (0” to 11” C)

Maximum Reset Reference Range: Return Fluid Reset 0” to 20” F

(0” to 11” C)

External Temperature Reset 20 to 125 F (-6.6 to 51.6 C)

External Signal Reset 4 to 20 mA

Minimum Reset Reference Range: Return Fluid Reset 0” to 20” F

(0” to 11” C)

External Temperature Reset 20 to 125 F (-6.6 to 51.6 C)

External Signal Reset 4 to 20 mA

Demand Limit Set Points

Switch Input:

Step 1 - 0 to 100% Capacity Reduction Step 2 - 0 to 100% Capacity Reduction

External Signal:

Maximum Demand Limit 4 to 20 mA Minimum Demand Limit 4 to 20 mA

Set points are grouped in subfunctions as follows:

Displaysm Fl chiller water and cooling ramp set points.

a. The first value shown is the occupied chilled water set point.

b. The next value displayed depends on how the sched- ule function has been programmed. (See pages 45- 47.) If dual set point has been selected, the next set

point after m has been pressed is the unoccupied chilled water set point. If single set point or inactive schedule has been selected in the schedule function,

then when q

is pressed, the display shows the

modified chilled water set point.

q

 

c. The final value

displayed when the

is pressed

is the cooling ramp loading rate. This is the maxi- mum rate at which the leaving chilled water is al- lowed to drop, and can be field set from 0.2 to 2.0 F (. 11” to 1.1” C)/minute. This value is not displayed unless the function is enabled (see Adjustable Field Configurations on page 45).

Reading and Channinrr Set Points - Example 4 shows how to read and change the chilled water set point. Other set points can be changed by following the same procedure. Refer to Table 9 for the sequence of display of set points in each subfunction.

Example 4 - Reading and Changing

Chilled Water Set Point

 

KEYPAD

DISPLAY

 

 

COMMENTS

 

 

 

 

ENTRY

RESPONSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SET POINT

System set points

 

 

 

 

 

CSPl

44.0

Present occupied chilled water

 

 

 

 

 

set point is 44 0 F

 

 

 

 

 

CSPI

420

 

 

 

 

 

 

 

 

 

 

 

~~~~~~~h~!$w~cupied

 

 

 

 

 

 

chilled water set point is 42 0 F

 

 

 

CSP2

44.0

Present

unoccupied chilled

water

 

 

 

set point is 44.0 F

 

 

 

 

 

 

 

 

 

 

 

 

CSP2

50.0

Press the FiD iris F[p l

a

y

 

 

 

 

 

 

 

 

 

 

shows new

 

chilled

 

 

 

 

 

unoccupied

 

 

 

 

 

water set point is 50.0 F

 

 

 

 

 

RESET

Displays the maximum reset and

 

 

 

 

 

minimum reset set points The

 

 

 

 

 

minimum

 

and maximum

reference

 

 

 

 

 

reset set points can also be

 

 

 

 

 

 

displayed.

 

 

 

 

 

 

 

These set points are not

 

 

 

 

 

 

 

accessible when reset type has

 

 

 

 

 

been configured for NONE in

 

 

 

 

 

the service function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature Reset Based on Return Water TemDerature - The control system is capable of providing leaving water temperature reset based on return water temperature. Be- cause the temperature difference between leaving water tem- perature and return water temperature is a measure of the building load, return water temperature reset is essentially an average building load reset method.

Under normal operation, the chiller maintairis a constant leaving water temperature approximately equal to chilled water set point. As building load drops from 100% down to O%, entering cooler water temperature drops in proportion to load. Thus, temperature drop across the cooler drops from a typical 10 F (5.5 C) at full load to a theoretical 0” F (0” C) at no load. See Fig. 4.

At partial load, leaving chilled water temperature may be lower than required. If this is allowed to increase (reset), the efficiency of the chiller increases. Amount of reset can be defined as a function of cooler temperature drop, as shown in Fig. 4. This is a simple linear function that requires 4 pieces of input data for the set function:

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Contents Contrc Unit Model Unit Sizes and Modular CombinationsField Keypaddisplay Ground Fault InterrupterSource PSI RELAY, BThermistors LOCAL/ENABLE-STOP-CCN Switch Positions and OperationCompressor Protection Control Module Cpcs Thermistor and Transducer LocationsSteps CapacityControl Steps Loading Sequence a Loading Sequence B Unit ControlCapacity Control Steps, 040-070 cant 060A\~**HzLoading Sequence a Loading Sequence B Unit Capacity Control Steps, 040-070 cant Oy&yaFBI Aiti 08Aqy,yA4l&pi’ BP’ StepsLoading Loading Sequence B Unit Control Loading Sequence a Loading Equence B Unit Altt BittWtf2Z$’ AlttAmrox ’tt$-t&Z3 Displacement Compressors UWrW Arwox A2.p $#l 110 50 Hz Loading Sequence a Quence B Unit ControlAlt,Blv Displacement Compressors Mvrox Loading Equence aEquence B 130, 240A Awrox Drt,t130, 24OA 130,24OALoading Equence a Unit Attll’A2.p T3gLoading Sequence a Sequence B Unit $$V Control Size Steps LOAD11Loadin Sequence B Unit Al% Al’,BI Displacement Compressors UVvW PWprox8514w B2,B3Loading Sequence B Unit 30GT Displacement Compressors Awox Capacity Control Steps, 225, 250,280Loac \IG Sequence a Loading Sequence B Unit Capacity Control Steps, 225, 250,280 cant Loac30GT Loading Sequence B Unit Control Capacity Control Steps, 225, 250, 280 cant250 1G Sequence aFAN Arrangement FAN Numbers Contactor Controlled Condenser Fan Sequence30GT250 60 Hz Condenser Fan Sequence cantFAN Arrangement FAN Numbers ~jACToRKeypad and Display Module Usage Keypad and Display Module Also Called HsioOperation Keypad Display Description Entry Response Accessing Functions and SubfunctionsFunctions and Subfunctions FunctionsKeypad Directory Analog Keypad Directory cant Status cantSubfunction Keypadentry Display Comment PressureHgbra Subfunction Outputs DisplaySubfunction Keypad Entry Display Comment Outputs OutputsQzq Keypad Directory cant Test cantSubfunction Keypad Entry Display Comment Override Clock SelectKeypad Directory Schedule cant Keypad Directory cant Service cord Keypad Directory cant Operationat and Mode Display Codes Example 1 Reading Alarm CodesLocal on Cool Alarms Modes Local on M O D E Example 2 Reading Current Operating ModesKeypad Display Example 3 Using Test Function Example 4 Reading and Changing Chilled Water Set PointKeypad Display Comments Entry Response Crsti Example 5 Using Return Water Temperature ResetKeypad Display Comments CRST2Reset Reference Temperature Outdoor AIR 1OR Space Temp Example 6 Changing Reset TypeEKE Keypad Display Entry Response FLD CFG Ertyp Lstyp DemandPpiq Example 8 Setting Time of Day Day of Week Demand LimitingMAX 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 SNB SwitchCGF Compressor Contactor RelayFig. IOD 24-V Safety Circuit Wiring 225, 250, and 280 Units Electronil c Expansion Valve EXV Page Thermistor and Pressure Transducer Locations Refrigerant Temperature Sensor T7, T8 040-210 SuctionAssociated 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 Standard and Accessory Unloaders 1NO. of AccessoryCircuit Circuit B Or2 30GN190-210 3OGT225,250,280 080-110 SO/SO Hz and 130 60 Hz Accessory Unloader Control WiringTLN HgbprSTAGE2 Contactor Switch Circuit Breaker TransformerLmyTEF4 ModuleElJ7-16 ModuleJ7-15 ThermistorRemote 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.

One of the main features of the Carrier 040-420 is its energy efficiency. The unit utilizes advanced compressors and a high-efficiency heat exchanger, which work together to minimize energy consumption while maximizing performance. This is crucial in today’s energy-conscious environment, as businesses strive to reduce operational costs and their carbon footprint. The unit also boasts a high SEER (Seasonal Energy Efficiency Ratio) rating, making it an attractive option for those looking to lower their utility bills.

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The robust design of the Carrier 040-420 ensures longevity and durability, even in harsh environmental conditions. Its weatherproof casing protects the internal components, enhancing the unit's performance and reliability over time. Maintenance is simplified with accessible design features, allowing technicians to conduct service checks and repairs without extensive downtime.

Overall, the Carrier 040-420 stands out as a modern HVAC solution that combines energy efficiency, advanced technologies, and user-friendly features. Its commitment to performance and sustainability makes it an ideal choice for businesses looking to enhance comfort while being mindful of their energy consumption. With its blend of innovation and reliability, the Carrier 040-420 continues to be a preferred option in the commercial HVAC market.
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