McQuay IM 743 Installation And Maintenance

26 IM710
Table 13: Binary Outputs for Main Control Board (MCB)
Binary Output Output Description Lit LED Indication Jumper Position
BO1 Discharge Air Fan, On/Off Fan On 1-SRC V
BO2 Outdoor Damper, Open/Closed Open 1-SRC V
BO3 Fan Operation Output Signal Fan Op 1-SRC V
BO4 Alarm Output Signal Normal 1-SRC V
BO5 Close Economizer Closing 1-SRC V
BO6 Open Economizer Opening 1-SRC V
BO7 Close Bypass Valve Closing 1-SRC V
BO8 Open Bypass Valve Opening 1-SRC V
BO9
a
Close Heating Valve Closing 1-SRC V
Electric Heat Stage #1 Heat On 1-SRC V
BO10
b
Open Heating Valve Opening 1-SRC V
Electric Heat Stage #2 Heat On 1-SRC V
BO11 Cool Enable Enabled 1-SRC V
BO12 VAV Box Output Signal Cooling Mode 1-SRC V
BO13
Decrease Discharge Fan Vane Position Decreasing 1-SRC V
Decrease Discharge Fan VFD Speed Decreasing 1-SRC V
BO14
Increase Discharge Fan Vane Position Increasing 1-SRC V
Increase Discharge Fan VFD Speed Increasing 1-SRC V
BO15 Spare - -
BO16 Spare - -
a. If the unit is equipped with modulating heat, output BO9 closes the heating valve. If the unit is equipped with electric heat output BO9 stages on Heating Stage #1.
b. If the unit is equipped with modulating heat, output BO10 opens the heating valve. If the unit is equipped with electric heat output BO10 stages on Heating Stage #2.

McQuay IM 743 Specifications

General

Brand	McQuay
Model	IM 743
Category	Controller
Language	English