Carrier 48AK Specifications

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

10Table 7 — Fan Performance — 48AJ,AK050 UnitsTable 8 — Fan Performance — 48AJ,AK060 UnitsLEGEND AND NOTES FOR TABLES 3-26.LEGENDBhp — Brake Horsepowe

100Table 94 — Economizer Control Board (ECB1) Inputs and OutputsPOINTNAMEPOINT DESCRIPTIONI/O POINTNAMEPLUG AND PINREFERENCESIGNAL PIN(S) PORT STATEIN

101Table 95 — Valve Control Board (ECB2) Inputs and OutputsPOINTNAMEPOINT DESCRIPTIONI/O POINTNAMEPLUG AND PINREFERENCESIGNAL PIN(S) PORT STATEINPUTSD

102Table 96 — Staged Gas Control Board (SCB) Inputs and OutputsPOINTNAMEPOINT DESCRIPTIONI/O POINTNAMEPLUG AND PINREFERENCESIGNAL PIN(S) PORT STATEINP

103Table 97 — Controls Expansion Board (CEM) InputsSCROLLING MARQUEE — This device is the keypad in-terface used to access the control information, re

104POWER EXHAUST — The units can be equipped with anoptional power exhaust system. The power exhaust fans areforward-curved fans with direct-drive mot

105FIELD CONNECTION TERMINAL STRIPS — Field con-nection terminal strips are located in the main control box. SeeFig. 28 and Table 100.Accessory Contro

106Table 100 — Field Connection Terminal StripsTERMINALBOARDTERMINALNO.DESCRIPTION TYPETB-1 - POWER CONNECTION OR DISCONNECT (in Main Control Box)TB11

107ECONOMIZER HUMIDITY CHANGEOVER SEN-SORS — The ComfortLink™ controls support 5 differentchangeover schemes for the economizer. These are:• Outdoor a

108CCN WEBORNETWORKOPTIONSREMOTECCN SITETELINKNON CARRIERHVACEQUIPMENTBRIDGE(RECOM-MENDED)CIDROOFTOPUNITCOMFORTID AIRTERMINALCIDCIDAIR DISTRIBUTION-DI

109SERVICEService Access —All unit components can be reachedthrough clearly labelled hinged access doors. These doors arenot equipped with tiebacks, s

11Table 9 — Fan Performance — 50AJ,AK020,025 UnitsLegend and Notes on page 10.Table 10 — Fan Performance — 50AJ,AK027,030 UnitsLegend and Notes on pag

110Totaline® environmentally sound coil cleaner is non-flam-mable, hypoallergenic, nonbacterial, and a USDA acceptedbiodegradable agent that will not

111Evaporator Fan Coupling Assembly — If the cou-pling has been removed for other blower assembly componentrepair or replacement, it is critical that

11213. Reinstall drive belts. (Refer to Belt Tension Adjustmentsection below.)14. Visually inspect the assembly. If the shafts are overly mis-aligned,

113Thermostatic Expansion Valve (TXV) — Each circuithas a TXV. The TXV is nonadjustable and is factory set to main-tain 10 to 13° F superheat leaving

114APPENDIX A — LOCAL DISPLAY TABLESMODE — RUN STATUSITEM EXPANSION RANGE UNITS CCN POINT WRITE STATUS PAGE NO.VIEWAUTO VIEW OF RUN STATUS→HVACascii s

115APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — RUN STATUS (cont)MODE — SERVICE TESTMODE — TEMPERATURESITEM EXPANSION RANGE UNITS CCN POINT WRITE ST

116APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — PRESSURESMODE — SET POINTSMODE — INPUTS*The display text changes depending on the remote switch conf

117APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — INPUTS (cont)*The display text changes depending on the remote switch configuration (Configuration→U

118APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — CONFIGURATION (cont)ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT PAGE NO.COOLCOOLING CONFIGURATION→Z

119APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — CONFIGURATION (cont)ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT PAGE NO.BPBUILDING PRESS. CONFIG→BP

12Table 11 — Fan Performance — 50AJ,AK035 UnitsLegend and Notes on page 13.Table 12 — Fan Performance — 50AJ,AK020,025 UnitsLegend and Notes on page 1

120APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — CONFIGURATION (cont)MODE — TIME CLOCKITEM EXPANSION RANGE UNITS CCN POINT DEFAULT PAGE NO.ALLMALERT

121APPENDIX A — LOCAL DISPLAY TABLES (cont)MODE — TIME CLOCK (cont)MODE — OPERATING MODESMODE — ALARMSAPPENDIX B — CCN TABLESAll A series units with C

122APPENDIX B — CCN TABLES (cont)STATUS DISPLAY TABLES (cont)TABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSCOOL_BCompressor B1 Relay CMPB1Comp

123APPENDIX B — CCN TABLES (cont)STATUS DISPLAY TABLES (cont)TABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSHEATINGHVAC Mode…………..: ascii text

124APPENDIX B — CCN TABLES (cont)STATUS DISPLAY TABLES (cont)SET POINT TABLECONFIG TABLESTABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSUINPUTS

125APPENDIX B — CCN TABLES (cont)CONFIG TABLES (cont)TABLE NAME RANGE UNITS POINT NAME DEFAULTBRODEFSCCN Time/Date Broadcast Off/On CCNBC OffCCN OAT B

126APPENDIX B — CCN TABLES (cont)SERVICE-CONFIG TABLESTABLE NAME RANGE UNITS POINT NAME DEFAULTALLMSPT lo alert limit/occ –10-245 dF SPLO 60SPT hi ale

127APPENDIX B — CCN TABLES (cont)SERVICE-CONFIG TABLES (cont)TABLE NAME RANGE UNITS POINT NAME DEFAULTECONEconomizer Installed ? Yes/No ECON_ENA YesEc

128APPENDIX B — CCN TABLES (cont)SERVICE-CONFIG TABLES (cont)TABLE NAME RANGE UNITS POINT NAME DEFAULTTRIMAir Temp Lvg SF Trim –10 - 10 ^FSAT_TRIM 0RA

129APPENDIX B — CCN TABLES (cont)MAINTENANCE DISPLAY TABLESTABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSALARMS01Active Alarm ascii ALARM_01--

13Table 13 — Fan Performance — 50AJ,AK050 UnitsTable 14 — Fan Performance — 50AJ,AK060 UnitsLEGEND AND NOTES FOR TABLES 3-26.LEGENDBhp — Brake Horsepo

130APPENDIX B — CCN TABLES (cont)MAINTENANCE DISPLAY TABLES (cont)TABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSECON_MINEcono Damper Command P

131APPENDIX B — CCN TABLES (cont)MAINTENANCE DISPLAY TABLES (cont)TABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSENTHALPYOutdoor Air Enthalpy O

132APPENDIX B — CCN TABLES (cont)MAINTENANCE DISPLAY TABLES (cont)TABLE DISPLAY NAME RANGE UNITS POINT NAME WRITE STATUSPRESBLDGBuilding Pressure &quo

133APPENDIX B — CCN TABLES (cont)MAINTENANCE DISPLAY TABLES (cont)TIME SCHEDULE CONFIG TABLEAllowable Entries: Day not selected = 0 Day selected = 1TA

134APPENDIX C — VFD INFORMATIONOn variable air volume units with optional VFD, the supplyfan speed is controlled by a 3-phase VFD. The VFD is locatedi

135Table B — VFD ConfigurationsVFD Operation — The VFD keypad is shown in Fig. B.The function of SOFT KEYS 1 and 2 change depending onwhat is displaye

136START UP WITH ASSISTANT — Initial start-up has beenperformed at the factory. To start up the VFD with the Start-UpAssistant or reset the VFD with t

137START-UP ASSISTANT MODE — To use the Start-UpAssistant, perform the following procedure:1. Select MENU (SOFT KEY 2). The Main menu will bedisplayed

138CLOCK SET MODE — The clock set mode is used forsetting the date and time for the internal clock of the VFD. Inorder to use the timer functions of t

139Table C — Fault CodesFAULTCODEFAULT NAMEIN PANELDESCRIPTION AND RECOMMENDED CORRECTIVE ACTION1 OVERCURRENTOutput current is excessive. Check for ex

14Table 15 — Fan Performance — 48AW,AY020,025 UnitsLegend and Notes on page 16.Table 16 — Fan Performance — 48AW,AY027,030 UnitsLegend and Notes on pa

140To reset a fault indicated by a flashing red LED, turn off thepower for 5 minutes. To reset a fault indicated by a red LED(not flashing), press RES

141If diagnostics troubleshooting has determined that thedrive is defective during the warranty period, contactABB Automation Inc., at 1-800-435-7365,

1426. Install the fan in reverse order, noting the following: thefan airflow is up (refer to arrow on fan); the fan wireharness is toward the front; t

143Else If: A compressor is diagnosed as being “Stuck On”{HVAC mode: ("Comp. Stuck On ")Else The control is free to select the normal heatin

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

CL-2--------------------------------------------------------------------------------------------------------------------------------------------------

CL-3ITEM EXPANSION RANGE DEFAULT ENTRYBPBUILDING PRESS. CONFIG→BP.CFBuilding Press. Config 0-2 0→BP.MTPower Exhaust Motors 1-2 1→BP.SBuilding Pressure

CL-4--------------------------------------------------------------------------------------------------------------------------------------------------

CL-5UNIT START-UP CHECKLISTMODEL NO.: _________________________________ SERIAL NO.: ______________________________________SOFTWARE VERSION ___________

15Table 17 — Fan Performance — 48AW,AY035 Units)Legend and Notes on page 16.Table 18 — Fan Performance — 48AW,AY040 UnitsLegend and Notes on page 16.A

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

16Table 19 — Fan Performance — 48AW,AY050 UnitsTable 20 — Fan Performance — 48AW,AY060 UnitsLEGEND AND NOTES FOR TABLES 3-26.LEGENDBhp — Brake Horsepo

17Table 21 — Fan Performance — 50AW,AY020,025 UnitsLegend and Notes on page 16.Table 22 — Fan Performance — 50AW,AY027,030 UnitsLegend and Notes on pa

18Table 23 — Fan Performance — 50AW,AY035 UnitsLegend and Notes on page 19.Table 24 — Fan Performance — 50AW,AY040 UnitsLegend and Notes on page 19.AI

19Table 25 — Fan Performance — 50AW,AY050 UnitsTable 26 — Fan Performance — 50AW,AY060 UnitsLEGEND AND NOTES FOR TABLES 3-26.LEGENDBhp — Brake Horsepo

2CONTENTS (cont)PageIndoor Air Quality Control ...56•OPERATION• SETTING UP THE SYSTEM• PRE-OCCUPANCY PURGETemperature Compensated

20Table 27 — Motor LimitationsLEGENDNOTES:1. Extensive motor and electrical testing on the Carrier units has ensured thatthe full horsepower range of

21CONTROLS QUICK STARTThe following section will provide a quick user guide to set-ting up and configuring the A series units with ComfortLink™control

22Multi-Stage Constant Volume Units withMechanical Thermostat —To configure the unit, per-form the following:1. The unit is shipped with the unit cont

233. Use the UP or DOWN keys to highlight CLOCK VISI-BILITY and press SEL (SOFT KEY 2). This parameteris used to display or hide the clock on the scre

24Table 29 — Service TestIndependent Outputs — The Independent sub-menuitems can be turned on and off regardless of the other categorystates. For exam

25VFD Control — On VFD equipped supply fans, supplyduct static pressure control may be left under unit control or beexternally controlled. To control

26IQ.A.C=2(IAQ Analog Input Used to Override) — UnderConfiguration→IAQ→AQ.SP, set IQ.O.P (IAQ EconomizerOverride Position). The IQ.O.P configuration i

273. Factory shut down (internal factory control level —SHUTDOWN).(“Factory Shut Down”)4. Unit Stop (software application level variable that acts asa

28System Mode =OFF?Inputs -> FIRE ->FSD in alarm?HVAC Mode = OFF(Fire Shutdown)HVAC Mode = OFF(Disabled)Unit not in factorytest AND fire-smokeco

29Unit Configuration Submenu — The UNIT sub-menu under the Configuration mode of the local displaycontains general unit configuration items. This sect

3Table 1 — A Series Product LineLEGENDThe A series units provide ventilation, cooling, and heating(when equipped) in variable air volume (VAV), variab

30Table 31 — Unit ConfigurationDischarge Pressure Transducers (DP.XR) — This configurationconfigures the unit for use with discharge pressure transduc

31There are either three or four compressors divided amongtwo refrigeration circuits in the unit. Circuit A always containstwo compressors (A1,A2). Ci

32Table 33 — SetpointsTable 34 — Supply Air Reset ConfigurationTable 35 — Cooling ConfigurationCapacity Threshold Adjust (Z.GN) — This configuration i

33Reverse Rotation Verified? (REV.R) — If this configurationis set to NO, then after a power up, in the normal run mode, thecontrol will check the suc

34Supply Air Set Point Control and the Staging of Compressors— Once the control has determined that a cooling mode is ineffect, the cooling control po

35C.TYP=3and4(Thermostat Cool Mode Selection) —When a thermostat type is selected, the decision making pro-cess involved in determining the mode is st

36EDT Low Override — There is an override if EDT drops toolow based on an alert limit that will lock out cooling. If thesupply air/evaporator discharg

37Table 41 — Staging Sequence Without Hot Gas Bypass —48/50AK,AY030-060 and Multi-Stage 48/50AJ,AW030-060Table 42 — Staging Sequence With Hot Gas Bypa

38Table 44 — Run Status Cool DisplayNext Stage EDT Increase (SUB.R) — This variable repre-sents (if subtracting a stage of cooling) how much the tempe

39The main elements to be calculated and used in the calcula-tion of SumZ are:1) the rise per percent capacity (R.PCT)2) the amount of expected rise f

4Accessory Navigator™ Display — The accessoryhand-held Navigator display can be used with the 48/50Aunits. See Fig. 2. The Navigator display operates

40Table 45 — Demand Limit ConfigurationTwo-Switch Demand Limiting (DM.L.S =1) — This type ofdemand limiting utilizes two discrete inputs:Demand Limit

41Head Pressure Control Operation— The following logic de-scribes the head pressure control routine when any compressorhas been commanded on.When the

42Heating Control Type (HT.CF) — The heating control typesavailable are selected/configured with this variable.0=NoHeat1 = Electric Heat2=2StageGasHea

43Table 48 — Heat/Cool Set Point OffsetsDemand Level Low Heat on Offset (L.H.ON) —Thisistheheating set point offset below the heating set point at whi

44HT.CF=3(Staged Gas Heating Control) — As an option,the units with gas heat can be equipped with staged gasheat controls that will provide from 5 to

45Staged Gas Heat Staging— Different unit sizes will controlheat stages differently based on the amount of heating capacityincluded. These staging pat

46Table 53 — Staged Gas Heat Control Steps (Configuration→Heat→SG.CT→HT.ST= 2)Table 54 — Staged Gas Heat Control Steps (Configuration→Heat→SG.CT→HT.ST

47Table 56 — IGC LED IndicatorsNOTES:1. There is a 3 second pause between error code displays.2. If more than one error code exists, all applicable er

48Table 57 — Static Pressure Control Configuration*Some defaults are model number dependent.Static Pressure Configuration (SP.CF) — This variable isus

49Static Pressure Reset Sensor (SP.RS) — If the outdoor airquality sensor is not configured (Configuration→IAQ→AQ.CF→OQ.A.C=0), then it is possible to

5CCN Tables and Display — In addition to the unit-mounted Scrolling Marquee display, the user can also accessthe same information through the CCN tabl

50Fan Status MonitoringGENERAL — The A Series ComfortLink™ controls offer thecapability to detect a failed supply fan through either a ductstatic pres

51Table 61 — Economizer Configuration TableEconomizer Trim for Sum Z? (E.TRM) — Sum Z is theadaptive cooling control algorithm used for multiple stage

52Outdoor Dewpoint Limit Check— If an outdoor relativehumidity sensor is installed, the control is able to calculate theoutdoor air dewpoint temperatu

53ECONOMIZER DIAGNOSTIC HELP — Because there areso many conditions which might disable the economizer frombeing able to provide free cooling, the cont

54Table 62 — Economizer Run Status TableBuilding Pressure Control — This control sequenceprovides control of the building pressure through the modulat

55Table 63 — Building Pressure Configuration*Some configurations are machine dependent.Table 64 — Power Exhaust Staging (BP.CF=1)Table 65 — Power Exha

56Smoke Control Modes — There are four smoke con-trol modes that can be used to control smoke within areas ser-viced by the unit: Pressurization mode,

57The logic that is used to control the dampers in response toIAQ conditions is shown in Fig. 10. The ComfortLink controlwill begin to open the damper

58Table 66 — Indoor Air Quality ConfigurationIAQ Analog Fan Config (Configuration→IAQ→AQ.CF→IQ.A.F) — This configuration is used to configure the cont

59Diff. Air Quality Hi Limit (Configuration→IAQ→ AQ.SP→DAQ.H) — This is the differential CO2levelatwhichIAQcontrol of the dampers will be at maximum a

6Table 2 — Scrolling Marquee Menu Display StructureRUNSTATUSSERVICETESTTEMPERATURES PRESSURES SETPOINTS INPUTS OUTPUTS CONFIGURATIONTIMECLOCKOPERATING

60Table 67 — CCN ConfigurationCCN Bus Number (CCNB) — This configuration is the CCNbus the rooftop is assigned.CCN Baud Rate (BAUD) — This configurati

61Table 68 — CONFIGURATION — ALLM SubmenuEDT Low Alert Limit/Occ (SA.L.O) — If the space tempera-ture is below the configurable occupied evaporator di

62Table 69 — CONFIGURATION — TRIM SubmenuOutdoor Air Temperature Sensor Trim (OAT.T) —This vari-able is used to adjust the outdoor air temperature sen

63Table 70 — Switch Logic ConfigurationTable 71 — CONFIGURATION — DISP SubmenuRemote Control Switch Input — The remote switchinput is located on the E

64Table 73 — Remote Switch Logic ConfigurationSpace Temperature Offset — Space Temperature Off-set corresponds to a slider on a T56 sensor that allows

65Table 74—TIMECLOCKMenuHOLIDAYINPERIOD(PER.X→DAYS→HOL)—Thisvari-able is used to include or remove a Holiday from the schedule.Each period is assigned

66TROUBLESHOOTINGThe Scrolling Marquee display shows the actual operatingconditions of the unit while it is running. If there are alarms orthere have

67Table 75 — Cooling Service AnalysisLEGENDPROBLEM SOLUTIONCOMPRESSOR DOES NOT RUNActive AlarmCheck active alarms using local display.Contactor Open1.

68Table 75 — Cooling Service Analysis (cont)LEGENDPROBLEM SOLUTIONCOMPRESSOR RUNNING BUT COOLING INSUFFICIENTSuction Pressure Low1. Refrigerant charge

69Table 76—GasHeatingServiceAnalysisTable 77 — Electric Heat Service AnalysisPROBLEM CAUSE REMEDYBurners Will Not Ignite. Active alarm. Check active a

7START-UPUnit Preparation —Check that unit has been installed inaccordance with the installation instructions and applicablecodes.Unit Setup — Make su

70Fig. 12 — IGC Service Analysis LogicLEGENDNOTE: Thermostat Fan Switch in the“AUTO” position.IDM — Induced-Draft MotorIGC — Integrated Gas Unit Contr

71Table 78 — 5K Thermistor Temperature vs. Resistance (SCT Sensors) (English)TEMP(F)VOLTAGEDROP(V)RESISTANCE(Ohms)–25 3.699 98,010–24 3.689 94,707–23

72Table 79 — 5K Thermistor Temperature vs. Resistance (SCT Sensors) (SI)TEMP(C)VOLTAGEDROP(V)RESISTANCE(Ohms)–32 3.705 100,260–31 3.687 94,165–30 3.66

73Table 80 — 10K Thermistor vs. Resistance (T55, T56, OAT, RAT, EDT, LAT Sensors) (English)TEMP(F)VOLTAGEDROP (V)RESISTANCE(Ohms)–25 4.758 196,453–24

74Table 81 — 10K Thermistor vs. Resistance (T55, T56, OAT, RAT, EDT, LAT Sensors) (SI)Table 82 — Suction Pressure Transducer Pressure (PSIG) vs. Volta

75Forcing Inputs and Outputs — Many variables maybe forced both from the CCN and directly at the local display.This can be useful during diagnostic te

76Cap Threshold Adding (Z.PLU) — This parameter is used inthe calculation of SMZ and is calculated as follows:Z.PLU = Configuration→COOL→Z.GN * (10 +

77Table 85 — Cooling Information Display TableTable 86 — Mode Trip Helper Display TableTable 87 — CCN/Linkage Display TableTable 88 — Compressor Run H

78Table 90 — Time Guard Display TableTable 91 — Software Version Numbers Display TableAlarms and Alerts — There are a variety of differentalerts and a

79Table 92 — Alert and Alarm CodesLEGENDALARM ORALERTNUMBERDESCRIPTION ACTION TAKEN BY CONTROLRESETMETHODPROBABLE CAUSEA051A051 Circuit A, Compressor

8Table 3 — Fan Performance — 48AJ,AK020,025 UnitsLegend and Notes on page 10.Table 4 — Fan Performance — 48AJ,AK027,030 UnitsLegend and Notes on page

80Table 92 — Alert and Alarm Codes (cont)LEGENDDIAGNOSTIC ALARM CODES AND POSSIBLECAUSESAlert Codes 51, 52, 55 and 56 (Compressor Safety)—Alertcodes 5

81• Internal compressor temperature sensor trip. The largeManeurop compressors (blue) used on the 040 B1, B2, 050,and 060 units have an internal tempe

82sensor is located in the economizer hood and is used for controlof the economizer. The sensor is a loop powered 4 to 20 mAsensor. This alert resets

83Alert code 178 (4-20 mA Static Pressure Reset Failure)—If this transducer fails (if the signal reads less than 2 mA or isabove 22 mA), and the unit

84Alarm Code 404 (Fire Shutdown)— This alarm occurs whenthe fire shutdown input is active (either open or closed depend-ing upon its configuration). I

85Alert Code 423 (Y and W Simultaneously)— This alert oc-curs in Thermostat Mode when Y1 or Y2 is energized simulta-neously with W1 or W2. Verify ther

86Fig. 13 — Typical Main Control Box Wiring Schematic

87TONEXTPAGEFig. 14 — Auxiliary Control Box Wiring Schematic

88LEN PORT FORUSE WITHNAVIGATORFig. 14 — Auxiliary Control Box Wiring Schematic (cont)

89Fig. 15 — Typical 2 Stage Gas Heat Wiring Schematic (Size 060 Unit Shown)

9Table 5 — Fan Performance — 48AJ,AK035 UnitsLegend and Notes on page 10.Table 6 — Fan Performance — 48AJ,AK040 UnitsLegend and Notes on page 10.AIRFL

90TONEXTPAGEFig. 16 — Typical Staged Gas Heat Wiring Schematic (Size 060 Unit Shown)

91FROMPREVIOUSPAGEFig. 16 — Typical Staged Gas Heat Wiring Schematic (Size 060 Unit Shown) (cont)

92Fig. 17 — Typical Electric Heat Control Schematic — 50AJ,AK,AW,AY (Size 060 Shown)

93TONEXTPAGEFig. 18 — Typical Power Schematic (Size 060 Unit Shown)

94FROMPREVIOUSPAGEFig. 18 — Typical Power Schematic (Size 060 Unit Shown) (cont)

95Fig. 19 — Controls Option Wiring Schematic

96Fig. 20 — Small Chassis Component Location (Size 020-035 Units)

97Fig. 21 — Large Chassis Component Locations (Size 040-060 Units)

98LEGEND AND NOTES FOR FIG. 13-21LEGENDNOTES:1. Factory wiring is in accordance with the National ElectricalCodes. Any field modifications or addition

99Table 93 — Main Control Board (MBB) Inputs and OutputsPOINTNAMEPOINT DESCRIPTIONI/O POINTNAMEPLUG AND PINREFERENCESIGNAL PIN(S) PORT STATEINPUTSGASF