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Unit Start-up
Sequence of Operation
NOTICE
Compressor Failure!
Failure to follow instruction below could result in
compressor failure.
Unit must be powered and crankcase heaters
energized at least 8 hours BEFORE compressors are
started.
Stop/Off/Auto
There are a number of reasons the Symbio 800 controller
will have the IntelliPak unit stopped or off. The user
interface home screen displays unit mode of Stopped or
Auto. Stopped is indicated when an override is preventing
operation such as: Local Stop, Emergency Stop, or
Equipment Stop input is active. Auto is indicated when in
automatic control but is currently off in modes such as:
Unoccupied, Ventilation Override, Emergency Override or
the like.
When Heat Cool Mode Status is Off, unit operation will be
prevented; whereas, all other modes allow operation.
Occupancy
There are many sources and types of occupancy. These
have an effect on the operation of the IntelliPak unit. All
sources are arbitrated (prioritized) into a final occupancy
status.
Sources of Occupancy
•
Occupancy Request is a communicated value from a
Building Automation System (BAS) schedule.
•
Occupancy Input is a local input from the space served
by the equipment. These are typically optional local
time clocks or occupancy sensors. This is a physical
input to the Symbio controller and is field installed.
•
Bypass Timer starts because of a user requested
occupancy override (also known as Occupied Bypass).
The occupant requests temporary occupied comfort
heating or cooling during unoccupied scheduled time
periods. An example of this would be the Timed
Override (TOV) button on the zone sensor. See
Override," p.
67for more information.
Occupancy Status Definitions
Occupied Operation: The IntelliPak unit is running in a
Normal mode providing temperature and ventilation control
to the normal occupied setpoints and comfort demands of
the occupants.
Unoccupied Operation: The IntelliPak unit is typically shut
down and is not providing temperature control to the
normal occupied setpoints. No ventilation is required or
provided. Temperature control is determined by energy
conservation and building protection thresholds.
RT-SVX072D-EN
Occupied Bypass Operation: The IntelliPak unit is
temporarily in an Occupied state for some period of time
and will automatically return to unoccupied operation when
the bypass timer expires. The Occupied Bypass Timer is a
user-adjustable field. However setting the timer to 0
minutes effectively disables Timed Override at the
equipment controller.
Occupied Standby Operation: Standby does not apply to
a discharge air controller. These units treat Standby as
Occupied. Space temperature control units in an Occupied-
Standby state are controlling to occupied standby
temperature setpoints. Normal operation will resume when
Occupancy Status goes to an Occupied state.
Timed Override
Timed Override (TOV) is a function that allows a user,
located in the conditioned space, to temporarily override
the IntelliPak operation from unoccupied mode to occupied
mode (referred to as Occupied-Bypass). To accomplish
this, Trane wired or wireless zone sensor devices are
equipped with "On" and "Cancel" push buttons. Some
sensors refer to the buttons as "Occupied" and
"Unoccupied". Timed override operation applies, in some
way, to all unit types.
On Wired sensors, the timed override request (ON) and
timed override cancel (CANCEL) buttons momentary
modify the zone temperature thermistor resistance to a
value outside the normal zone temperature operating
range. The Symbio 800 controller detects this change;
however, this momentary button press does not disrupt the
space temperature value being used. The press duration is
0.5 to 8 seconds.
Wireless sensors process the timed override request/
cancel signal at the sensor and communicate the
appropriate timed override status (mode).
Service Pin Message Request
A secondary feature of wired zone sensors is Service Pin
Message Request, not associated with TOV. An On/
Occupied push button press for 8 to 30 seconds can initiate
Neuron ID and Program ID message broadcast on a LON
network. This function is used to install and troubleshoot
LON networks. This feature benefits installation of a LON
"Timed
device by initiating the service pin message from a zone
sensor rather than at the equipment.
Performance Data
Supply Fan Performance
Note: Direct Drive plenum fan applications require
minimum external static values ranging from 0.3 to
0.7 in H
O.
2
67
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