39
Table 20 — 50BVJ,W Standard I/O Table
LEGEND
* Inputs and outputs are optional. Sensors not provided. 50BV units do
not contain a return fan; return fan control is available for return fan
separate from 50BV unit.
† Read-only points. No effect on Sequence of Operation.
NOTE: Transformer’s common terminals are tied together.
INPUT /OUTPUT TYPE
TYPICAL
DEVICE TYPE OF I/O
CONNECTION
PIN
NUMBERS
I/O TYPE
CONFIG
I/O FLEX 6126 Controller
Inputs
Occupancy Override * Dry Contact
(N.O) UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-12 - 19 & 20 DI
Duct Static Pressure Sensor 0 -5 VDC UI (0-10 V, RTD Therm/Dry, 0-20 mA) UI-11 -17 & 18 AI
Compressor Status (compressor 4) IEM 2 UI (0-10 V, RTD Therm/Dry, 0-20 mA) UI-10 - 16 & 17 DI
Compressor Status (Compressors 1-3) IEM 1 UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-09 - 14 & 15 DI
Return Air Sensors 10K Type II UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-08 - 13 & 14 AI
Entering Water Temperature (required for
Economizer) 10K Type II UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-07 - 11 & 12 AI
Supply Air Temperature Sensor 10K Type II UI (0-10 V, RTD Therm/Dry, 0-20 mA) UI-06 - 10 & 11 AI
Relative Humidity Sensor*† 0-5 VDC UI (0-10 V, RTD Therm/Dry, 0-20 mA) UI-05 - 8 & 9 AI
CO
2
Sensor (Required for demand control ventilation)* 0-5 VDC UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-04 - 7 & 8 AI
Leaving Water Temperature Sensor (standard) 10K Type II UI (0-10 V, RTD Therm/Dry,
0-20 mA) UI-03 - 5 & 6 AI
UPM II - Compressors 2 & 4 UI Pulse Counting (0-20 mA) UI-02 - 2 & 4 DI - pulse
UPM II - Compressors 1 & 3 UI Pulse Counting (0-20 mA) UI-01 - 2 & 3 DI - pulse
Outputs
Open AO (0-10 V) AO-6 - 11 & 12 AO
Open AO (0-10 V) AO-5 - 9 & 10 AO
Return Fan Speed (VFD Drive Terminal Strip)* ABB ACH550-UH AO (0-10 V) AO-4 - 7 & 8 AO
Open AO (0-10 V) AO-3 - 5 & 6 AO
Modulating Hot Gas Re-heat Valves AO (4-20mA/0-10 V) AO-2 - 3 & 4 AO
Fan Speed - (VFD Drive Terminal Strip AI-1) ABB ACH550-UH AO (4-20mA/0-10 V) AO-1 - 1 & 2 AO
Compressor Stage 4 Command (Y4) BO (Relay 5A at 250Vac) BO-6 - 16-18 BO
Compressor Stage 3 Command (Y3) BO (Relay 5A at 250Vac) BO-5 - 13-15 BO
Compressor Stage 2 Command (Y2) BO (Relay 5A at 250Vac) BO-4 - 10-12 BO
Compressor Stage 1 Command (Y1) BO (Relay 5A at 250Vac) BO-3 - 7-9 BO
Open BO (Relay 5A at 250Vac) BO-2 - 4-6 BO
Supply Fan Enable signal (VFD Drive Terminal Strip) ABB ACH550-UH BO (Relay 5A at 250Vac) BO-1 - 1-3 BO
Xnet Remote Expansion
I/O Flex EX8160
expander
I/O Expansion Board Xnet Comm-Port
AI — Analog Input
AO — Analog Output
BI — Digital Input
BO — Digital Output
UI — Universal Input
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