Bosch Control Air 6120 Installation & Operation Manual
Commercial water to air ddc applications
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Summary of Contents for Bosch Control Air 6120
- Page 1 Installation & Operation Manual For Commercial Water to Air DDC Applications Control Air 6120...
- Page 2 Installation & Operation Manual Bosch Control Air 6120 - BTC 469503105 A (10.2025)
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Page 3: Table Of Contents
12.2 To Mount the BACview®6 Device 12.3 To Wire the BACview®6 Device Introduction Electrical Schematics - Water to Air Control Air 6120 and Control Air 6120 Point Expander Components Overview 13.1 Control Air 6120 Point Expander Control Air 6120 Features Troubleshooting 14.1 Communication LED's... -
Page 4: Key To Symbols And Safety Instructions
The info symbol indicates important information where there is no risk to people or which are known to the State of California to cause cancer and birth defects or property. other reproductive harm. For more information go to www.P65Warnings.ca.gov. Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 5: Introduction
I/O connections. The Control Air 6120 can be connected to the Control Air 6120 Point Expander to increase the number of inputs and outputs, allowing your system to grow as the size of the job increases. -
Page 6: Components Overview
RNET port Rotary Switches Dipswitch Baud/Network Protocol Full Half Duplex Jumper 10. EIA-485/EIA-232 Jumper 11. Port 2a 12. Port 1 ARC156 Only 13. Universal Input Select Mode Jumpers 14. Universal Input Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 7: Control Air 6120 Features
The Rnet port is a four-connector block reserved mainly for wiring the ZS combo sensors to the Control Air 6120. It consists of 2 points for power (12VDC and Gnd) and 2 points for communication (Rnet + and Rnet -). This port is also used for data when connecting a Control Air M to the controller (Rnet+ and Rnet- only). -
Page 8: Specifications
1 MB non-volatile battery-backed RAM, 4 MB Flash memory, 16bit memory bus Real-time clock Battery-backed real-time clock keeps track of time in event of power failure Table 1 * Depends on available memory Bosch Control Air 6120 - BTC 469503105 A (10.2025) - Page 9 Standard Device Profile as defined in ANSI/ASHRAE Standard BACnet support • 135-2012 (BACnet) Annex L, Protocol Revision 9 Listed by UL916 (Canadian Std C22.2 No. 205-M1983, CE, FCC Part 15 - Subpart B - Class A Table 2 Bosch Control Air 6120 - BTC 469503105 A (10.2025)
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Page 10: Dimensions
10-5/8 in. (27 cm) 3 in. (7.6 cm) 1-9/16 in. (4 cm) 10-3/16 in. (25.9 cm) 1-1/2 in. (3.8 cm) 13/64 in. (.5 cm) Table 4 Control Air 6120 Point Expander Dimensions 10 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 11: Mounting And Wiring
The Control Air 6120 supports one Control Air 6120 Point Expander to increase input/output capacity. Figure 5 The Control Air 6120 Point Expander may be mounted directly onto the Control Air NOTICE 6120 using the screws provided with the Control Air 6120 Point Expander and the captive fasteners that are installed into the Control Air 6120. -
Page 12: To Wire For Power
NOTICE 19.2KBPS Improper operation! 38.4KBPS The Control Air 6120 has an operating range of 21.6 Vac to 26.4 Vac. If voltage 76.8KBPS measured at the Control Air 6120's input terminals is outside this range, the Table 5 Control Air 6120 may not work properly. -
Page 13: Wiring Inputs And Outputs
ON to OFF to ON time (full cycle) is 100 msec Table 8 * The Control Air 6120 can perform pulse counting for dry contact or voltage inputs if you assign the input to a Pulse to Analog Input microblock. -
Page 14: To Wire Inputs
Installation & Operation Manual To Wire Inputs Turn off the Control Air 6120's power. Connect the input wiring to the screw terminals on the Control Air 6120. Figure 7 NOTES: - Connect the shield wire to the GND terminal with the ground wire. -
Page 15: Output Wiring Specifications
• Maximum current (Amps) the controlled device requires to operate Binary Outputs The Control Air 6120 has 6 binary outputs. You can connect each output to a maximum of 250 Vac. Analog Outputs The I/O Flex 6126 has 6 analog outputs that support voltage or current devices. -
Page 16: To Wire Outputs
6120 and to the controlled device. Figure 9 Set the AO Mode Select jumper to the type of device you are wiring the output to. Turn ON the Control Air 6120's power. 16 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 17: Local Access
USB Link Kit Figure 10 If using a USB isolator, plug the isolator into your computer's USB port, and then plug the USB Link Kit cable into the isolator. Bosch Control Air 6120 - BTC 469503105 A (10.2025) | 17... -
Page 18: Wiring Zone Sensors To The Control Air 6120
Overall dimensions Width: 2-7/8 in. (7.3 cm) Sensor with CO Height: 4-13/16 in. (12.22 cm) Depth: 1-1/4 in. (3.18 cm) Listed by FCC Part 15-Subpart B-Class A, CE Table 10 18 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) - Page 19 Strip about .25 inch (.6 cm) of the inner insulation from each wire. If wiring 1 cable to the Control Air 6120, cut the shield wire off at the outer jacket, then wrap the cable with tape at the outer jacket to cover the end of the shield wire.
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Page 20: Water To Air Systems
If the air temperature and humidity are within a user-configurable This option employs the use of a self-resetting Differential Pressure Switch (DPS) range, the damper solenoid will be energized to open by the Control Air 6120, the to prove water flow across a unit's water-to-refrigerant heat exchanger. If configured compressor will be indexed off, and the fan is used to cool the space. - Page 21 (EWT sensor), and a 3-way diverting valve. When there is a call for cooling, the EWT sensor connected to the Control Air 6120 will monitor the entering water temperature to the unit and determine if the compressor should be used for cooling or if the water temperature is low enough to cool the entering air with the economizer coil.
- Page 22 UPM board are wired to the controller at this input from A2L UPM Alarm Output (4STG units factory to transmit error pulse codes to the Control Air 6120. Faults include: UI-02 - 2 & 4 Pulse...
- Page 23 “auto” mode (fan is energized only during a call for heating or cooling). Continuous mode is the factory default. Table 14 Bosch Control Air 6120 - BTC 469503105 A (10.2025) | 23...
- Page 24 Heat Gas ReHeat (HGRH) BO (Dry contact) This input energizes or de-energizes the CW valve open or close BO-1 - 1 & 2 Condenser water valve BO (Dry contact) Table 16 24 | Bosch Control Air 6120 - BTC 469503105 A (10.2025)
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Page 25: Water To Air Operation
Humidity Control ( hot gas re-heat optional) • BRN2: Brownout 2 Alarm • Auxiliary/Emergency Electric heat output control (optional) • A2L: A2L Refrigerant Alarm • A2L: A2L 2 Refrigerant Alarm • COMM: Communication Alarm Bosch Control Air 6120 - BTC 469503105 A (10.2025) | 25... -
Page 26: Sequence Of Operation
Electric heat is field-installed; Binary Outputs 5, 6, 7, and 8 (BO-5, BO-6, enabled, the unit will run until the occupied set-point has been satisfied. BO-7, BO-8) on the Control Air 6120 Point Expander are available for this option. It BAS:... -
Page 27: Temperature Sensor Selection
When the ZS-Sensor is selected as the primary zone sensor, a zone temperature installed and it is connected via the Rnet port of the Control Air 6120. A maximum range alarm is asserted when the measured space temperature is above or below... -
Page 28: Fan Mode
Under most circumstances during a smoke event the fan will be commanded off. The fan control signal is provided on BO-1 of the Control Air 6120. Fan operation However, there are conditions where fan operation may be required to prevent is interlocked with heating and cooling operations. -
Page 29: Heating & Cooling Operation
The unit may be setup to receive a smoke event via a contact closure. The smoke detector status input is located on the Control Air 6120 Point Expander. The response to a smoke event must be determined by safety regulations and jurisdiction of the local governing body. - Page 30 Any of the following alarms will immediately shut all compressors stages down: • Leaving water high • Leaving water low • Fan alarms • Status Switch • High Static • Smoke • A2L Alarm 30 | Bosch Control Air 6120 - BTC 469503105 A (10.2025)
- Page 31 The DAT sensor is typically factory installed at the inlet of the blower housing and Leaving Water Sensor Failure: connected to IN-6 of the Control Air 6120. For parallel coil applications it is best to If leaving water sensor is outside of normal operating limits.
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Page 32: Virtual Bacview® Application
Figure 16 11.1 To Download the Virtual BACview® Application To put the application on your laptop: Go to the website https://www.bosch-homecomfort.com/us/en/ residential/technical-documentation/software/ Scroll down to Virtual BACview Software. Select Download. 32 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 33: Bacview®6 Device
Hang the BACview®6 device on the 4 mounting screws. Control Module If mounting above the Control Air 6120 or on a wall, pull the cable out to the side BACview mounted above of the BACview®6 device without bending or pinching the cable beneath the control module BACview®6 device. -
Page 34: To Wire The Bacview®6 Device
Strip about .25 inch (.6 cm) of the inner insulation from each wire. Insert the wires into both of the screw terminal connectors. Rnet port of controller Rnet+ Rnet– +12V Figure 20 34 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) - Page 35 Figure 21 Insert the screw terminal connector into the BACview®6 device with the screw heads facing out. Insert the screw terminal connector into the Control Air 6120's power terminals. Bosch Control Air 6120 - BTC 469503105 A (10.2025) | 35...
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Page 36: Electrical Schematics - Water To Air
Electrical Schematics - Water to Air This schematic is a generic representation and should not be used for wiring purposes. Please refer to Unit Wiring Schematics for more detailed representations. Figure 22 36 | Bosch Control Air 6120 - BTC 469503105 A (10.2025) -
Page 37: Control Air 6120 Point Expander
13.1 Control Air 6120 Point Expander This schematic is a generic representation and should not be used for wiring purposes. Please refer to Unit Wiring Schematics for more detailed representations. Figure 23 Bosch Control Air 6120 - BTC 469503105 A (10.2025) | 37... -
Page 38: Troubleshooting
Installation & Operation Manual Troubleshooting If you have problems mounting, wiring, or addressing the Control Air 6120, contact Bosch Technical Support 1-800-283-3787. 14.1 Communication LED's The LED’s indicate if the controller is speaking to the devices on the network. The LED’s should reflect communication traffic based on the baud rate set. -
Page 39: Recovering From A Power Outage
Field Assistant. We strongly recommend you archive whenever you change factory settings, such as schedules, devices instances, network addresses, Power must be ON to the Control Air 6120 when replacing the battery, or your etc. date, time, and trend data will be lost. - Page 40 United States and Canada Bosch Thermotechnology Corp. 65 Grove St. Watertown, MA 02472 Tel: 800-283-3787 www.bosch-homecomfort.us BTC 469503105 A / 10.2025 Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.
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