Manuals / Carrier / Household Appliance / Air Conditioner

Carrier 040-420 specifications Condenser Fan Sequence

Models: 040-420

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Table 5 - Condenser Fan Sequence

Head Pressure Control - The microprocessor con- trols the condenser fans in order to maintain the lowest con- densing temperature possible, thus the highest unit efficiency. Instead of using the conventional head pressure control meth- ods, the fans are controlled by the position of the EXV and suction superheat.

As the condensing temperature drops, the EXV opens to maintain the proper suction superheat. Once the EXV is fully open, if the condensing temperature continues to drop, the suction superheat begins to rise. Once the suction super- heat is greater than 40 F (22.2 C), a fan stage is removed after 2 minutes,

As the condensing temperature rises, the EXV closes to maintain the proper suction superheat. Once the EXV has closed to 39.5% open (300 steps open), a fan stage is added after 2 minutes.

During start-up, all the condenser fans are started when the condensing temperature reaches 95 F (35 C) to prevent excessive discharge pressure during pulldown. See Table 5 for condenser fan sequence of operation.

Table 5 - Condenser Fan Sequence

FAN ARRANGEMENT

FAN NUMBER(S)

FAN

CONTACTOR

CONTROLLED

BY

WI

1

FC-Al

Compressor

Al

30GN040-050

I

2

FC-Bi

Compressor

Bl

3

FC-A2

First Stage

Microprocessor

4

FGB2

Second

Stage

I

MicrODrOceSSOr

30GN060,070

FC-Al

I

Compressor

Al

Compressor

Bi

First Stage

Microprocessor

5 6

FGB2

Second

Stage

Microprocessor

30GN080,090

FC-Al

Compressor

Al

Compressor

Bi

30GNl00,110

(and associated modular units)

1

FC-Al

Compressor

Al

2

FC - 81

Compressor

Bl

3

FC - A2

First Stage

4

F&B2

Microprocessor

5,

7, 6,

8

FC-AS, FGB3

Second

Stage

Compressor

.

-_----

3, 4, 5, 6, 7, a

FC-A2, FC-A3,

Third

Stage

FGB2,

FC-B3

Microprocessor

30GN130 170

(and associated modular units)

5 7

FC-Al

Compressor

Al

WWER

6, 8

FC-Bl

Compressor

Bl

FC-A2, FC-A3

30GN190,210

(and associated modular units)

5, 7

I

FC-Al

Compressor

Al

I

6. 8

I

FC-Bi

Comwessor

Bl

3, 9

FC-A2

Frist

Stage

4, 10

FC-B2

Microprocessor

1 , 3, 9, 11

FC-A2,

FGA3

Second

Stage

2, 4, 10,

12

FGB2,

FC-B3

Microprocessor

*Control

box.

26

Image 26

Carrier 040-420 specifications Condenser Fan Sequence

Contents

ACCESSORY UNLOADER INSTALLATION CONTENTSSAFETY CONSIDERATIONS 040-420Table 1 - Unit Sizes and Modular Combinations GENERALMAJOR SYSTEM COMPONENTS DsroiLv Compressor Protection Control Module CPCS Table 2 - LOCAL/ENABLE-STOP-CCNSwitch Positions and Operation Table 3 - Thermistor and Transducer LocationsControl Steps, OPERATION DATATable 4A - Capacity Table 4A - Capacity Control Steps, 040-070cant 060A\~**HzTable 4A - Capacity Control Steps, 040-070cant “‘“G Hzylf,t oy&ya08Aqy ,y A;.$Aiti A4l&pi’&Page A;;:;H Wtf2Z$’ AlttBitt BittA’tt A;;;#Amrox $-t&Z3“B’p ~,;~~J“A:tkA2’i3BI~ Page hwrox Bitt AlPtlBl’“Att l”l’ B1 ttBitt A2.py&t3g A&t$$V B;$+~l*;;# ~i~~~~ BB’!J‘-J-&W~’ CKEL 86p Hz Page Table 4D - Capacity Control Steps, 225, 250,280 hwroxJG SEQUENCE UNITLOAC 4G SEQUENCEf& Hz Table 5 - Condenser Fan Sequence Table 5 - Condenser Fan Sequence cant Table 6 - Keypad and Display Module Usage Keypad and Display Module Also Called HSIOFig. 3 - Keypad and Display Module Table 8 - Accessing Functions and Subfunctions Table 7 - Functions and SubfunctionsTable 9 - Keypad Directory STATUS Table 9 - Keypad Directory cant STATUS cant SUBFUNCTION 10 OUTPUTS TESTTable 9 - Keypad Directory cant STATUS cant DISPLAYTable 9 - Keypad Directory cant TEST cant SCHEDULESERVICE Table 9 - Keypad Directory SCHEDULE cantat Clt cl Table 9 - Keypad Directory cant SERVICE cordCltt ct lTable 9 - Keypad Directory cant SET POINTTable 10 - Operationat and Mode Display Codes Example 1 -Reading Alarm Codesp-jq Example 2 - Reading Current Operating Modes Chilled Water Set Point Example 3 -Using Test FunctionExample 4 - Reading and Changing f73c= -- / Example 5 -Using Return Water Temperature ResetFig. 4 - Cooling Return Water Reset 8- 16 ? Example 6 - Changing Reset TypeFig. 5 - Cooling External Temperature Reset Table 11 -Service Functions _ ‘-+pFig. 7 - 4-20mA Cooling Temperature Reset Demand Limiting Example 8 - Setting Time of Day and Day of WeekFig. 8 - 4-20mA Table 12 - Factory Configuration Keystrokes Table 13 - Adjustable Field ConfigurationsExample 9 - Using the Schedule Function Example 9 continued next pageExample 10 - Holiday Schedule Function Example 9 - Using the Schedule Function cant‘EYo Fig. 9 - Sample Time ScheduleComplete Unit Stoppage - Complete unit stop TROUBLESHOOTINGTypical Stoppage Faults and Reset Types Table 14 - Alarm Codes Possible causes of failure Code 30 Reset input failure 4 to 20 mA CPCS Fig. IOA - 24-VSafety Circuit Wiringi2G7 ’ Sl32MP TNANZ24VAC IlEO2Plug LEGENDLow Voltage TransformerC G F Fig. 12 - EXV Cable Connections to 1 Electronic Expansion ValveFig. 11 - Electronil c Expansion Valve EXV EXV Driver Module, DSIO EXVCircuit A -Thermistor T7, Suction Pressure Trans ppTT - Suction Pressure Transducer LEGEND D P T - Discharge Pressure TransducerOil Pressure Transducer T - Thermistor NumberFig. 15 - Thermistors Fig. 14 - Thermistor LocationsCircuits A and B, Lead Compressor Only WATER-SIDETEMPERATURE SENSOR Tl, T2, -ALL UNITSFig. 16 - Pressure Transducer TEMP:;fTURE Page Page Fig. 18 - Module Address Selector Switch LocationsControl Modules %o-693 Fig. 19 - Sensor Bus Wiring Communications1 $i 1 !;i fL.w--6%2COMM Fig. 22 - 4 In/4 Out Module SIOTroubleshooting TableInstallation ACCESSORY UNLOADER INSTALLATIONTable 18 - Standard and Accessory Unloaders 13 6 y Fig. 23 - Accessory Unloader Control Wiring 69080-110SO/SO Hz and 130 60 Hz ‘. \3.Wire in the solenoid valves 4368 WIRINGFig. 26B - Demand Limit - Two External Switch k367Fig. 30 - Remote Reset from 4-20mA Signal Fig. 27 - Demand Limit - 4-20mA SignalExternally Powered Fig. 28 - Demand Limit - 4-20mA Signalu2 TB-5 InstallationFig. 35 -Remote Alarm ~,. $$scribed in m H and r;lFl sections on page Page Copyright 1994 Carrier Corporation