Table of Contents
Advertisement
Unit Startup
•
Outdoor Air Flow Compensation Enable = Disable
Morning Warm Up, Pre-Cool, Night Purge, Unoccupied,
and Off modes of operation will override damper minimum
position to 0%.
Overrides
The controller normally provides heating, cooling and
ventilation for building comfort. The below control functions
can intervene or override normal operation. These
functions allow control over the IntelliPak unit as well as a
means for the Service Technician to accomplish their tasks.
The order of priorities are listed. For example, an External
Stop will prevent the unit from performing Ventilation
Override.
1. Local Stop
2. Emergency Stop
3. Equipment Stop
4. Manual Control
5. Ventilation Override
6. Emergency Override
7. Operating Mode Off
8. Normal operating modes
If local stop, emergency stop, or equipment stop request a
Stop, the unit will shut down and not resume operation until
all inputs allow automatic operation.
Local Stop
Local Stop is performed by the user interface Stop button
on the user interface display. The controller will perform a
Normal Shutdown process unless, the user additionally
selects Immediate Shutdown at the user interface when
prompted.
Normal Shutdown Process
In a normal shutdown situation, compressors, fans, and
other systems of the unit are allowed to go through an
orderly shutdown sequence. For example, compressors
continue to run for any remaining Minimum Run time.
If a Service Tool requires the unit to be in user interface
Stop for an operation, e.g. binding, configuration, or
software download, the Service Tool will send the Symbio
800 a user interface Stop command. A Service Tool screen
is displayed giving the user an opportunity to allow or
cancel the operation. This executes a user interface Stop
command as if it had been done from the user interface
including storing through a power cycle. After this occurs
the only way the unit can be set back to user interface Auto
is through the user interface directly.
Immediate Shutdown Process
If an immediate shutdown is selected, compressors, fans,
and all other devices are immediately stopped. A normal
shutdown already in progress will be expedited. The use of
this feature is discouraged since the normal shutdown
cycle is provided for the normal shutdown sequence.
88
Emergency Stop
Symbio 800 accepts a dry contact closure input suitable for
customer connection to request Stop or Auto modes from
an external device. The Emergency Stop input is normally
closed which represents an Auto request.
Contact opening will perform an Immediate Stop and
generate a latching diagnostic. To return to Auto operation,
the input must be closed and a manual reset must be
performed.
Equipment Stop
Symbio 800 accepts a dry contact closure input suitable for
customer connection to request Stop or Auto modes from
an external device. The Equipment Stop binary input is
normally closed which represents an Auto request.
Contact opening will perform an Immediate Stop. The unit
will automatically return to Auto operation when the input is
closed.
Manual Control
Manual control is intended for servicing the machine. It
provides manual control of all of all valves, dampers,
actuators, fans, compressors and heating functions. This
can be done while fans, compressors and heating systems
are operating. Single or multiple, controls may be
overridden. Remaining controls set to Auto will enforce the
limits to protect the machine from damage. Diagnostics
remain active to protect the machine from damage. See
Programming Guide (RT-SVP011*-EN) for further
information.
Important: Manual Control is for experienced service
personnel.
Manual Control can be set from the Manual Control
Settings page on the user interface. Manual control varies
in design but all have an automatic mode which is the
default mode for most unit operation.
Once a manual override is set to manual, it will remain in
manual until one of the following occur:
•
Manual override is set back to automatic control by
setting the individual overrides to Auto.
•
Power is cycled.
•
A Manual Overrides Timer expires and ALL manual
overrides are cleared.
•
The operator presses a Clear All Manual Overrides
from the operator display or Tracer TU.
Ventilation Override
Ventilation Override Modes (VOM) give the building
controller the ability to override normal unit operation and
provide special ventilation operation. VOM is initiated only
at the provided five binary inputs (Mode A, Mode B, Mode
C, Mode D, Mode E). When any of the normally open
contacts are closed, VOM initiates specified functions such
as space pressurization, exhaust, purge, purge with supply
air pressure control, and unit off when any one of the
corresponding binary inputs are activated. The
RT-SVX073A-EN
Advertisement
Table of Contents
