Carrier 48AJ Operating And Service Manual page 109

Fig. 23 — Economizer Control Board (ECB1) and VAV Control Board (ECB2)
Table 107 — Economizer Control Board (ECB1) Inputs and Outputs
POINT
POINT DESCRIPTION
NAME
INPUTS
RMTIN Remote occupancy
ECONENBL,
Economizer enable
ECOORIDE
RARH Return air relative humidity
OARH Outdoor air relative humidity
OUTPUTS
Economizer actuator
ECONOCMD
(analog control)
ECONOCMD Economizer actuator
(digital control)
PE_A Power Exhaust stage A
PE_B Power Exhaust stage B
PE_C Power Exhaust stage C
ECON_PWR Economizer Power
I/O POINT PLUG AND PIN
NAME REFERENCE
DI1 J4, 1-2
DI2 J4, 3-4
AN1 J5, 1-3
AN2 J5, 4-6
AO1 J9, 1-2
PP/MP J7, 1-3
RLY1 J8, 1-3
RLY 2 J8, 4-6
RLY 3 J8, 7-9
RLY 6 J8, 16-18
109
SIGNAL PIN(S)
2
4
1=24VDC, 2=0-20mA in, 3=GND
4=24VDC, 5=0-20mA in, 6=GND
1=0-20mA, 2=GND
1=PP/MP Data, 2=24VAC, 3=GND
1 = 2 = RLY1A, 3 = RLY1B
4 =5 = RLY2A, 6 = RLY2B
7 = 8 = RLY3A, 9 = RLY3B
16 = 17 = RLY6A, 18 = RLY6B
A48-7706
PORT STATE
24VAC = 1, 0VAC = 0
24VAC = 1, 0VAC = 0
0-20mA
0-20mA
0-20mA OUT
Belimo PP/MP Protocol
1 = Closes RLY1A/RLY1B
1 = Closes RLY2A/RLY2B
1 = Closes RLY3A/RLY3B
1 = Closes RLY6A/RLY6B