CCS Smart Equipment Control Board for Single Packaged Unit (SPU) Controller Installation Instructions
6
Operation
The controllers are supplied in a pre-configured format.
You do not need to configure the controller. Refer to the
Commercial Comfort System (CCS) Operation
Overview Technical Bulletin (LIT-12011617)
or the
Smart Equipment Controls (SEC) Quick Start Guide
(LIT-12011938)
for information on operating modes and
functionality.
Troubleshooting
Use the following information to troubleshoot the
System Manger and Zone Coordinator.
Power Status LED
The display backlight and green Power LED remain lit
as long as power is applied to the C and 24V terminals.
The red Fault LED lights, goes off briefly, and then
flashes throughout the startup sequence.
The green SA Bus LED lights briefly.
During the startup sequence, the joystick, the Enter
button, and the Cancel button are
not
functional.
The LCD shows a countdown on the top line.
After approximately 15 seconds, the green SA Bus
LED does one of the following:
•
Lights to indicate the UCB has not established
communication and is awaiting communication
from SA Bus devices
•
Flashes to indicate the UCB established
communication with SA Bus devices
After the startup sequence finishes, the display shows
XxXx
on both lines if no alarm is active. The red Fault
LED stops flashing and turns off. The joystick, Enter,
and Cancel buttons are operational.
Communication Bus Problems
Several factors may influence the behavior of the
communication bus. In addition, certain problems can
affect the bus in multiple ways and have multiple
symptoms, which makes the exact diagnosis difficult.
For example, duplicate addresses on the bus can
degrade performance, make the device go offline, or
stop communication completely.
Incomplete Address
With the SEC controller for VAV, COBP must have the
address switch set to 4 on the zone communication
bus. Other settings prevent the SPU from
communicating on the System Communication bus.
Duplicate Addresses
Two or more devices on a communication bus cannot
have the same address. For example, two SPUs on the
System communication bus cannot both have the
address 4. If two devices on the same bus have the
same address, performance can degrade or serious
communication problems may occur. These problems
include the devices not coming online or all
communication stopping completely.
Check for duplicate addresses in the following ways
depending on the severity of the situation:
•
If the bus performance is degraded, check the
address switch settings at the devices with
unreliable communications.
•
If a specific device is not communicating, remove
the device with communication problems and
check if the device address remains online at the
System Manager or Zone Coordinator.
•
If the bus communication problems are severe,
and no communication is present (or if you cannot
determine where communication is unreliable),
partition (disconnect and isolate a portion of the
bus for testing purposes) and test the bus portion
connected to the System Manager and Zone
Coordinator controllers.
Figure 7: Startup Countdown
