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Sequence of Operation
download, the Service Tool will send the Symbio 800 a
Front Panel Stop command. A Service Tool screen is
displayed giving the user an opportunity to allow or cancel
the operation. This executes a Front Panel Stop command
as if it had been done from the Front Panel including
storing through a power cycle. After this occurs the only
way the unit can be set back to Front Panel Auto is through
the Front Panel 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.
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.
External Stop
Symbio 800 accepts a dry contact closure input suitable for
customer connection to request Stop or Auto modes from
an external device. The External Auto/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.
88
•
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
compressors and condenser fans, and all other
components not directly controlled via VOM events, are
disabled during the ventilation operation. If more than one
ventilation sequence is activated, Mode A has highest
priority, Mode E has lowest.
This function gives the customer the ability to override
normal unit operation via a supervisory controller. Typically,
these requests originate from a fire control panel. Flexibility
is provided by allowing the customer to re-define each of
the five responses at the front panel, along with allowing
each individual response to be 'Locked' to insure expected
operation is not changed. See Programming Guide for
more information.
This feature is optional. When configured VOM has priority
over Emergency Override, System Mode Off, and normal
unit operation. The following overrides will prevent or
terminate VOM operation.
•
Local Stop
•
External Stop
•
Emergency Stop
•
Manual Control
When any VOM Mode (A, B, C, D, E) input is activated or
closed, the VOM mode of operation will begin in less than
10 seconds, and a VOM Relay binary output will energize/
close. Heating capacity, cooling capacity, and Rapid
Restart will be disabled/terminated.
Refer to the table below summarizing the unit operation in
response to VOM binary inputs Modes. VOM inputs are
fully configurable; therefore,
factory default settings.
If one or more of the 5 VOM inputs are closed, the unit will
enter the VOM mode with the highest priority (A highest, E
lowest). Should the unit be in an active VOM mode and a
VOM input of higher priority is closed, the unit will
immediately transition to the higher priority mode. Should
the unit be in an active VOM mode and a VOM input of
lower priority is closed, the unit will not change to this lower
priority mode until the current (higher priority)VOM mode
binary input is opened.
Table 40, p. 89
provides the
RT-SVX063G-EN
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