United Technologies Carrier Weathermaker 48A2, Controls, Start-Up, Operation, Service, And Troubleshooting

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Table 102 — Economizer Control Board (ECB1) Inputs and Outputs
Table 103 — RXB Control Board (ECB2) Inputs and Outputs
NOTE: RXB is required for Digital Scroll or Humidi-MiZer.
POINT
NAME
POINT DESCRIPTION
I/O POINT
NAME
PLUG AND PIN
REFERENCE
SIGNAL PIN(S) PORT STATE
INPUTS
RMTIN Remote occupancy DI1 J4, 1-2 2 24VAC = 1, 0VAC = 0
ECONENBL,
ECOORIDE
Economizer enable DI2 J4, 3-4 4 24VAC = 1, 0VAC = 0
RARH Return air relative humidity AN1 J5, 1-3 1=24VDC, 2=0-20mA in, 3=GND 0-20mA
OARH Outdoor air relative humidity AN2 J5, 4-6 4=24VDC, 5=0-20mA in, 6=GND 0-20mA
OUTPUTS
ECB1_AO1 ECB1, analog output 1 AO1 J9, 1-2 1=0-20mA, 2=GND 0-20mA OUT
ECONOCMD
Economizer actuator
(digital control)
PP/MP J7, 1-3 1=PP/MP Data, 2=24VAC, 3=GND Belimo PP/MP Protocol
PE_A Power Exhaust stage A RLY1 J8, 1-3 1 = 2 = RLY1A, 3 = RLY1B 1 = Closes RLY1A/RLY1B
PE_B Power Exhaust stage B RLY 2 J8, 4-6 4 =5 = RLY2A, 6 = RLY2B 1 = Closes RLY2A/RLY2B
PE_C Power Exhaust stage C RLY 3 J8, 7-9 7 = 8 = RLY3A, 9 = RLY3B 1 = Closes RLY3A/RLY3B
ECON_PWR Economizer Power RLY 6 J8, 16-18 16 = 17 = RLY6A, 18 = RLY6B 1 = Closes RLY6A/RLY6B
POINT
NAME
POINT DESCRIPTION
I/O POINT
NAME
PLUG AND PIN
REFERENCE
SIGNAL PIN(S) PORT STATE
INPUTS
DI1 J4, 1-2 2=Vin, 1=24VAC 24VAC = 1, 0VAC = 0
DI2 J4, 3-4 4=Vin, 3=24vac 24VAC = 1, 0VAC = 0
DI3 J4, 5-6 6=Vin, 5=24vac
DI4 J4, 7-8 8=Vin, 7=24vac
DI5 J4, 9-10 10=Vin, 9=24vac
DI6 J4, 11-12 12=Vin, 11=24vac
BP Building static pressure AN1 J5, 1-3 1=24VDC, 2=0-20mA in, 3=GND 0-20mA
SP Supply Duct static pressure AN2 J5, 4-6 4=24VDC, 5=0-20mA in, 6=GND 0-20mA
CCT Air Temp Lvg Evap Coil AN3 J6, 1-2 1=Vin, 2=GND (thermistor, ohms)
DSDT DS Discharge Temperature AN4 J6, 3-4 3=Vin, 4=GND (thermistor, ohms)
AN5 J6, 5-6 5=Vin, 6=GND (thermistor, ohms)
AN6 J6, 7-8 7=Vin, 8=GND (thermistor, ohms)
OUTPUTS
SFAN_VFD Supply Fan Inverter speed AO1 J9, 1-2 1=0-20mA, 2=GND 0-20mA OUT
CMPDSCAP Digital Scroll Solenoid PP/MP J7, 1-3 1=PP/MP Data, 2=24VAC, 3=GND Belimo PP/MP Protocol
RLY1 J8, 1-3 1 = 2 = RLY1A, 3 = RLY1B 1 = Closes RLY1A / RLY1B
RLY2 J8, 4-6 4 = 5 = RLY2A, 6 = RLY2B 1 = Closes RLY2A / RLY2B
HUM3WVAL Humidimizer 3 Way Valve RLY3 J8, 7-9 7 = 8 = RLY3A, 9 = RLY3B 1 = Closes RLY3A / RLY3B
RLY4 J8, 10-12 10 = 11 = RLY4A, 12 = RLY4B 1 = Closes RLY4A / RLY4B
RLY5 J8, 13-15 13 = 14 = RLY5A, 15 = RLY5B 1 = Closes RLY5A / RLY5B
MLV Minimum load valve RLY6 J8, 16-18 16 = 17 = RLY6A, 18 = RLY6B 1 = Closes RLY6A / RLY6B