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RT-SVX063E-EN
Table 37.
External relief fan control points
(continued)
Object Name
(a)
Description
Object States or
values
Exhaust Fan Speed
Setpoint Active
Active setpoint
input to relief fan
speed control
0 to 100%
Exhaust Fan Speed
Status
Indicates the
requested speed to
the relief fan, 0%
when fan is off.
0 to 100%
(a)
Reference Integration Guide ACC-SVP02B (or later)
Table 38.
Exhaust fan speed setpoint summary
Exhaust Fan
Speed Setpoint
Enable
Exhaust Fan
Speed Setpoint
Exhaust fan
operation
Disable
NA
Fan under local
control
Enable
0%
Commands the fan
off
Enable
1% to min speed%
Fan operates at
drive minimum
setting
(a)
Enable
>min speed% to
100%
Fan ramps between
motors min-rpm
and the Relief Fan
Maximum Speed
Setpoint (rpm),
adjustable at the
unit’s front panel
display, service
settings screen.
(a)
The drive minimum RPM setting is 10 percent of nameplate rated
speed. The min speed% is equal to: 100 x (drive minimum RPM /
Relief Fan Maximum Speed Setpoint).
External Outdoor Air Damper Control
To control the outdoor damper directly, via TGP2 or an
external control, a setpoint can be written to
Economizer Minimum Position Setpoint BAS. The
controller will limit the damper movement. The
commanded position reports at Outdoor Air Damper
Position.
To have complete damper control, the following
functions should be disabled or removed from
configuration via Tracer TU or front panel display.
However, the controller must be configured with an
Economizer damper.
•
Economizer Airside Enable Default = Disabled
•
Demand Control Ventilation Enable = Disabled
•
Traq Enable = Disabled
•
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. External Stop
4. Manual Control
5. Ventilation Override
6. Emergency Override
7. Operating Mode Off
8. Normal operating modes
If local stop, emergency stop, or external 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 Front Panel Stop button
on the front panel display. The controller will perform a
Normal Shutdown process unless, the user additionally
selects Immediate Shutdown at the front panel when
prompted.
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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 Front Panel
Stop for an operation, e.g. binding, configuration, or
software 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.
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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.
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