TEC2664Z-3 BACnet® MS/TP Rooftop Controller for Stand-Alone and Networked Zoning Systems
Installation Instructions
20
Sequence of Auto Status Display Scrolling
The TEC2664Z-3 Rooftop Controller features a
two-line, eight-character status display. A low-level,
backlight is always active and can only be seen in the
dark. When the rooftop controller is left unattended, an
auto scroll status display indicates the actual status of
the system.
Each item is scrolled one-by-one with the backlight in
the low-level mode. Pressing any key causes the
low-level backlight to brighten to high-level mode.
When left unattended for 30 seconds after changes are
made, the display resumes auto status display
scrolling.
To brighten the low-level backlight to high-level mode,
simply press any key on the face of the rooftop
controller. The high-level backlight returns to low-level
mode when the rooftop controller is left unattended for
45 seconds.
If alarms are detected, they are automatically displayed
at the end of the status display scroll. During an alarm
message display, the backlight lights up at the same
time as the alarm message and shuts off during the
remainder of the status display scroll. Two alarm
messages can appear at any given time.
The priority of alarms is as follows:
•
Comm Lost:
This alarm indicates that
communication is lost between the rooftop
controller and the zone devices on the MS/TP Bus;
however, the rooftop controller can remain online
with the supervisory controller.
•
SetClock:
This alarm indicates that the clock
needs to be reset due to a power failure of more
than 6 hours.
•
DAS Alrm:
This alarm indicates a high or low
alarm at the discharge air sensor. If no discharge
air sensor is connected (-40.0°F/-40.0°C reading),
the associated functions (such as lockouts and
alarms) are disabled. If the discharge air sensor is
shorted (122.0°F/50.0°C reading), the associated
functions (such as lockouts and alarms) are
enabled.
•
Service:
This alarm indicates there is a service
alarm, as per the configurable Digital Input DI1.
•
Filter:
This alarm indicates that the filters are dirty
and need to be replaced, as per the configurable
Digital Input DI1.
See Table 3 for the sequence of auto status display
scrolling.
Table 3: Sequence of Auto Status Display Scrolling
Clock Status
System Mode
Schedule Status
Outdoor
Temperature
1
Alarms
(If Detected)
Monday
12:00 A.M.
Sys Mode
Off
Occupied
Outdoor
xx.x °C or °F
Service
2
Sys Mode
Auto
Unoccupied
DAS Alm
3
Override
SetClock
4
Filter
5
Comm Lost
6
1.
The outdoor temperature displays only if an outside air temperature sensor is installed. If an outside air temperature sensor
is not installed, an ambiguous outdoor temperature displays on the zone controller indicating that no outside air
temperature sensor is installed. If no outside air temperature sensor is installed, the auto status display scrolling skips past
the outdoor temperature.
2.
This alarm is valid only if the
DI1
parameter is configured and used as a service alarm.
3.
This alarm is valid only if the
Dis HL
or
Dis LL
parameter is enabled.
4.
This alarm is valid only if the power off clock time retention has expired.
5.
This alarm is valid only if the
DI1
parameter is configured and used as a filter alarm.
6.
This alarm is valid only if communication is lost to the zones (not necessarily a BACnet communication failure).
