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Table 27 — Main Base Board (MBB) Connections
DISPLAY NAME SENSOR LOCATION I/O TYPE POINT NAME
CONNECTION
PIN NUMBER
Inputs
Input power from TRAN2 Control Box 24 VAC J2, 1 and 8
COFS Drain Pan 24 VAC COFS J4, 1-4
FIRE SHUTDOWN Supply/Return/Space Switch input FIREDOWN J5, 1-4
IGC FAN REQUEST Gas section Switch input IGC_IFO J6, 1-2
RARH LEVEL Return/Space 0-20 mA RARH J7, 1, 5-6
OARH LEVEL Economizer 0-20 mA OARH J7, 2, 6-7
ECON ACT POSITION Economizer 2-10vdc DAMPPOS J7, 3, 8
FAN SUPPLY TEMP Indoor fan housing 10k thermistor FST J8, 1, 4
RETURN AIR TEMP Return 10k thermistor RAT J8, 2, 5
OUTDOOR AIR TEMP Outdoor coil 10k thermistor OAT J8, 3, 6
CIR.A SUC. PRESS Circuit A Suction pipe 0-5 VDC pressure transducer SSP_A J9, 1-2, 5
CIR.A DIS. PRESS Circuit A Discharge pipe 0-5 VDC pressure transducer SDP_A J9, 4-3, 6
IAQ LEVEL Return/Space 0-20 mA IAQ TB5, 4-6
SLIDER OFFSET VAL Space 10k thermistor SPTO TB5, 2-3
SPACE TEMPERATURE Space 10k thermistor SPACE_T TB5, 1-2
CIR.A HPS Circuit A Discharge pipe Switch Input CIRA_HPS QC, 1-2J18, 1, 3
Configurable Field-installed Switch Input QC, 3-4J18, 2,4
REMOTE OCC SWITCH Field-installed Switch Input REMOCC TB3, 1-2
REMOTE SHUTDOWN Field-installed Switch Input REMSHUT TB3, 3-4
FILTER STATUS SW Indoor fan section Switch Input FILTSTAT TB3, 5-6
TSTAT G INPUT Space Switch Input G TB1, G
TSTAT Y1 INPUT Space Switch Input Y1 TB1, Y1
TSTAT Y2 INPUT Space Switch Input Y2 TB1, Y2
TSTAT Y3 INPUT Space Switch Input Y3 TB1, Y3
TSTAT W1 INPUT Space Switch Input W1 TB1, W1
TSTAT W2 INPUT Space Switch Input W2 TB1, W2
Outputs
Optional power out Not used 24 VAC J1, 1-2
ECON CMD POSITION 0-20 mA DAMPCMD J7, 4, 8
ODF SPEED OUT 1 PWM1 ODF1SPD J10, 1-4
ODF SPEED OUT 2 PWM2 ODF2SPD J11, 1-4
ODF SPEED OUT 3 PWM3 ODF3SPD J12, 1-4
ALARM RELAY Relay ALMOUT TB2, 3-4
Not used Not used Relay J3A, 1, 3
Not used Not used Relay J3A, 2, 4
Not used Not used Relay J3B, 1, 3
Not used Not used Relay J3B, 2, 4
PE1 RELAY Relay PE1 J3C, 1-4
CCH RELAY Relay CCHR1 J3D, 1, 4
COMPRESSOR A2 Relay COMP_A2 J3D, 2, 5
COMPRESSOR A1 Relay COMP_A1 J3D, 3, 6
HEAT 2 RELAY Relay HEAT_2 J3E, 1, 3
HEAT 1 RELAY Relay HEAT_1 J3E, 2, 4
Communication
Building Automated System (BAS) Building Communication TB4, 1-5
Ethernet Not used Communication J13, J14
IDF SPEED OUTPUT Indoor fan section Communication FANSPEED J15, 1-4
Expansion LEN Bus Not used Communication J16, 1-4
Local Equipment Network (LEN) Communication J17
RNET Sensors Building Communication J20, 1-4
Display Copper Cable Communication J23
RNET Service Access Communication J24, 1-5
Display Connections
Display Copper Cable Communication J1
Local Equipment Network (LEN) Communication J2
USB-A Communication J3
USB-B Not used Communication J4
Keypad Ribbon Cable Communication J6
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