BAC-7401 Heat Pump Controller
Revision E
7
SECTION 2
Installing the controller
This section provides a brief overview of the BAC-7401 and the
BAC-7401C BACnet heat pump controllers. Review this material
before you begin installing the controller.
Mounting
Mount the controller inside of a metal enclosure. KMC Controls recommends using
a UL-approved Enclosed Energy Management Equipment Panel such as a KMC
model HCO–1034, HCO–1035 or HCO–1036. Insert #6 hardware through the four
mounting holes on the top and bottom of the controller to securely fasten it to a flat
surface. See
for mounting hole locations and dimensions. To
maintain RF emission specifications, use either shielded connecting cables or enclose
all cables in conduit.
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.
Note
KMC supplied Control Basic programs assign input 1 (I1) to the space
temperature sensor input. If the KMC programs are not in use or are modified,
input 1 is available for other use. Inputs 2, 3 and 4 are not assigned by KMC
programs and are available as needed.
Pull–up resistors
For passive input signals, such as thermistors or switch contacts, use a pull-up
resistor. For KMC thermistors and most other applications set the switch to the
On
position. See Illustration 2-1 for the pull-up switch location.
Illustration 2-1 Pull-up resistors and input terminals
T4 R
TN T3
T2 R
TN T1
1
BAC-7401 cover removed.
Off On
