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Advanced Applications Controller
Section 1
Specifications ...........................................................................................................................3
Accessories ..............................................................................................................................5
Safety considerations .............................................................................................................6
Section 2
Mounting .................................................................................................................................7
Connecting inputs ..................................................................................................................7
Connecting outputs ................................................................................................................8
Connecting to a NetSensor ....................................................................................................9
Connecting to an MS/TP network .......................................................................................9
Connecting power ................................................................................................................11
Programming ........................................................................................................................12
Section 3
Operation ...............................................................................................................................13
Controls and Indicators .......................................................................................................13
Restoring factory settings ....................................................................................................16
Revision E
Installation and Operation Guide
BAC-7401 and BAC-7401C
for Heat Pump Applications
905-019-57E
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Summary of Contents for KMC Controls BAC-7401
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Page 1: Table Of Contents
Installation and Operation Guide BAC-7401 and BAC-7401C Advanced Applications Controller for Heat Pump Applications Section 1 About the BAC-7401 Specifications ...........................3 Accessories ..........................5 Safety considerations ......................6 Section 2 Installing the controller Mounting ..........................7 Connecting inputs ........................7 Connecting outputs ........................8 Connecting to a NetSensor ....................9 Connecting to an MS/TP network ..................9... - Page 2 The material in this manual is for information purposes only. The contents and the product it describes are subject to change without notice. KMC Controls, Inc. makes no representations or warranties with respect to this manual. In no event shall KMC Controls, Inc.
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Page 3: About The Bac-7401 Specifications
BAC-7401 controller. It also introduces safety information. Review this material before installing or operating the controller. The BAC-7401 is a native BACnet, fully programmable controller designed to control heat pump units. Use this versatile controller in stand-alone environments or networked to other BACnet devices. As part of a complete facilities management system, the BAC-7401 controller provides precise monitoring and control of connected points. - Page 4 Programs and program parameters are stored in nonvolatile memory. Auto restart on power failure Application programs KMC Controls supplies the BAC-7401 with programming sequences for heat pump units: Roof top operation based on occupancy, night ◆ setback, proportional hot and chilled water valve control.
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Page 5: Accessories
BAC-7401 Heat Pump Controller About the BAC-7401 Accessories Environmental limits Operating 32 to 120° F (0 to 49° C) Shipping –40 to 140° F (–40 to 60° C) Humidity 0–95% relative humidity (non-condensing) Installation Supply voltage 24 volts AC (–15%, +20%), 50-60 Hz, 25 VA, Class 2... -
Page 6: Safety Considerations
Safety considerations Safety considerations KMC Controls assumes the responsibility for providing you a safe product and safety guidelines during its use. Safety means protection to all individuals who install, operate, and service the equipment as well as protection of the equipment itself. -
Page 7: Installing The Controller
Connecting inputs The BAC-7401 controller has four universal inputs. Each input can be configured to receive either analog or digital signals. By using the optional pull-up resistors, either passive or active devices may be connected to the inputs. -
Page 8: Connecting Outputs
If the pulse is an active voltage (up to a maximum of +5 volts DC ), then place the input pull-up jumper in the Off position. Connecting outputs The BAC-7401 outputs are single-stage triacs designed to directly switch 24-volt ac circuits. Triac 1 and 2 output and... -
Page 9: Connecting To A Netsensor
NetSensor The Network RJ–12 connector provides a connection port to a NetSensor model KMD-1161 or KMD-1181. Link the controller to a NetSensor with a KMC Controls approved cable up to 75 feet long. See the installation guide supplied with the NetSensor for complete NetSensor installation instructions. - Page 10 Illustration 2-4 MS/TP network wiring Note The BAC-7401 EIA–485 terminals are labeled -A, +B and S. The S terminal is provided as a connecting point for the shield. The terminal is not connected to the ground of the controller. When connecting to controllers from other manufacturers, verify the shield connection is not connected to ground.
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Page 11: Connecting Power
The controllers require an external, 24 volt, AC power source. Use the following guidelines when choosing and wiring transformers. Use a KMC Controls Class–2 transformer of the appropriate size to supply ◆ power to the controllers. KMC Controls recommends powering only one controller from each transformer. -
Page 12: Programming
Programming Programming Network configuration For more information on installing, configuring, and programming HVAC system controllers, see the following documents available on the KMC Controls web site: ◆ BACstage User’s Guide to Installation and Getting Started (902-019-62) ◆ BAC-5000 Reference Guide (902019-63) ◆... -
Page 13: Operating The Controller
BAC-7401 Heat Pump Controller SECTION 3 Operating the controller This section provides a brief overview of the BAC-7401 and the BAC-7401C Direct Digital Controllers. Review this material before you attempt to install the controller. Operation Once configured, programmed and powered up, the controller requires very little user intervention. - Page 14 Operating the controller KMC Controls Controls and Indicators Ready LED The green Ready LED indicates the state of the controller. This includes automatic addressing functions that are fully described in the guide MS/TP Addressing For BACnet Controllers. Power up During controller initialization, the Ready LED is continuously illuminated for 5 to 20 seconds.
- Page 15 BAC-7401 Heat Pump Controller Operating the controller Controls and Indicators Nomad patterns There are three Com LED patterns that indicate that the controller is an automatic addressing nomad controller that is receiving valid MS/TP traffic. Table 3-2 Automatic addressing nomad patterns...
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Page 16: Restoring Factory Settings
Operating the controller KMC Controls Restoring factory settings estoring factory settings If the controller appears to be operating incorrectly, or is not responding to commands, you may need to reset or restart the controller. To perform a reset or restart, remove the cover to expose the red restart push-button and then use one of the following procedures. - Page 17 BAC-7401 Heat Pump Controller Operating the controller Restoring factory settings Caution Returning object values to their relinquished defaults during a cold start may abruptly turn connected equipment on or off. To prevent equipment damage, turn connected equipment off or temporarily remove the output terminal blocks from the controller before performing a warm start.
- Page 18 Operating the controller KMC Controls Restoring factory settings Revision E...
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