Trane IntelliPak RA 20, Installation, Operation And Maintenance Manual

Page: 89 / 140

RT-SVX063E-EN 89
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.
IIm mp po orrtta an ntt:: 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 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,
Table 39,
p. 90 provides the 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.
When all VOM inputs are open, within 15 seconds,
VOM terminates. All unit components will be reset OFF
or CLOSED, and after Unit Power Up Delay is honored
the unit will start normal operation.
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