Carrier WEATHERMAKER 48J Started Manual

Also see for 48AJ: Installation, Start-Up and Service Instructions Installation instructions Operation and service guide Operating and service guide

Table 119 -- Controls Expansion Board (CEM) InputsPOINT I/O POINT PLUG AND PINPOINT DESCRIPTION SIGNAL PIN(S) PORT STATENAME NAME REFERENCEINPUTSSFS Supply Fan Status switch DI 1 37, 1-2 2 0 = 24vac, 1= 0vacDMD SWl Demand Limit - SWl DI 2 J7, 3-4 4 0 = 24vac, 1= 0vacDMD SW2/ Demand Limit - SW2/DHD]SClN Dehumidification Switch Input DI 3 J7, 5-6 6 0 = 24vac, 1= 0vacPRES Pressurization DI 4 J7, 7-8 8 0 = 24vac, 1= 0vacEVAC Evacuation DI 5 J7, 9-10 10 0 = 24vac, 1= 0vacPURG Purge DI 6 J7, 11-12 12 0 = 24vac, 1= 0vacIAQIN Indoor Air Quality Switch DI 7 J7, 13-14 14 0 = 24vac, 1= 0vacAN7 J6, 1-3 2 (1 = loop power) (O-20mA input)DMDLMTMA 4-20mA Demand Limit AN8 J6, 4-6 5 (4 = loop power) (O-20mA input)EDTRESMA 4-20mA Evaporator Discharge SP Reset AN9 J6, 7-9 8 (7 = loop power) (O-20mA input)OAQ Outside Air CO2 Sensor AN10 J6, 10-12 11 (10 = loop power) (O-20mA input)SPRESET SP Reset milliamps AN10 J6, 10-12 11 (10 = loop power) (O-20mA input)CEM 10K1/ CEMAN1 lOktemp J5,1-2/CEM 4201 CEM AN1 4-20 ma J5,1-2 AN1 J5, 1-2 1 (thermistor, ohms)CEM 10K2/ CEM AN2 1Ok temp J5,3-4/CEM 4202 CEM AN2 4-20 ma J5,3-4 AN2 J5, 3-4 3 (thermistor, ohms)CEM 10K3/ CEM AN3 1Ok temp J5,5-6/ AN3 J5, 5-6 5 (thermistor, ohms)CEM 4203 CEM AN3 4-20 ma J5,5-6CEM 10K4/ CEM AN4 1Ok temp J5,7-8/ AN4 J5, 7-8 7 (thermistor, ohms)CEM 4204 CEM AN4 4-20 ma J5,7-8AN5 J5, 9-10 9 (thermistor, ohms)AN6 J5, 11-12 11 (thermistor, ohms)SCROLLING MARQUEE- This device is the keypad in-terface used to access the control information, read sensorvalues, and test the unit. The scrolling marquee display is a4-key, 4-character, 16-segment LED display as well as anAlarm Stares LED. See Fig. 30. The display is easy to operateusing 4 buttons and a group of 11 LEDs that indicate thefollowing menu structures:• Run Status• Service Test• Temperatures• Pressures• Set points• Inputs• Outputs• Configuration• Timeclock• Operating Modes• AlarmsThrough the scrolling marquee the user can access all theinputs and outputs to check on their values and status. Becausethe unit is equipped with suction pressure transducers anddischarge saturation temperature sensors it can also displaypressures typically obtained from gages. The control includes afull alarm history, which can be accessed from the display. Inaddition, through the scrolling marquee the user can access abuilt-in test routine that can be used at start-up colmnission andto diagnose operational problems with the unit. The scrollingmarquee is located in the main control box and is standard onall units.O Run StatusO Configurationqime Clock@AEarm Status@Operath_gModes@/Uarms]Fig. 30- Scrolling MarqueeSUPPLY FAN -- The size 020 to 050 units are equipped withtwo 15 x ll-in, forward-curved fans. The size 051 and 060units have three 15 x 11-in. fans. They are on a colranon shaftand are driven by single belt drive 3-phase motor. The fan iscontrolled directly by the (_n_folTLink TM controls.VARIABLE FREQUENCY DRIVE (VFD) -- On variablevolume units, the supply fan speed is controlled by a 3-phaseVFD. The VFD is located in the fan section behind a remov-able panel as shown in Fig. 24 and 25. The VFD speed iscontrolled directly by the (_,fortLink controls through a 4 to20 mA signal based on a supply duct pressure sensor. Theinverter has a display, which can be used for service diagnos-tics, but setup of the supply duct pressure set point and controlloop factors is done through the scrolling marquee display. TheVFD is powered during normal operation to prevent condensa-tion from forming on the boards during the off mode and isstopped by driving the speed to 0 (by sending a 2 mA signal tothe VFD).The A Series units use ABB ACH550 VFDs. The interfacewiring for the VFDs is shown in Fig. 31. Terminal designationsare shown in Table 121.Table 120 -- IGC Board Inputs and Outputs] CONNECTORPOINT NAME POINT DESCRIPTION PIN NO.INPUTSRT 24 Volt Power Supply R1 ,CW Heat Demand 2G Fan 3LS Limit Switch 7,8RS Rollout Switch 5,6SS Hall Effect Sensor 1,2,3CS Centrifugal Switch (Not Used) 9,10FS Flame Sense FSOUTPUTSCM Induced Draft Motor CMIFO Indoor Fan IFOR 24 Volt Power Output (Not Used) RSPARK SparkerLED D sp ay LED122