Diagnostics Reset Command; Setpoint Calculations - Trane BCI-I Integration Manual

BCI-I Configuration

Diagnostics Reset Command

The IntelliPak control system monitors the operation of the HVAC equipment. If an abnormal
condition is detected, a diagnostic message is displayed on the human interface of the equipment
control panel. In addition, the set of internal diagnostics is mapped to the set of BACnet binary input
objects, as listed in
active when the diagnostic is detected. The object has been configured to send a BACnet event
message to external BACnet devices as defined by the protocol.
The BAS has the ability to reset internal diagnostics by controlling the state of the Diagnostic Reset
Command object (BO 14). The procedure for resetting diagnostics is as follows:

Setpoint Calculations

The equipment has the ability to perform two basic control functions:
•
•
When the unit is configured for discharge air control, it controls the temperature of the air leaving
the unit to the discharge air temperature setpoint.
When the unit is configured for space air temperature control, it controls the air temperature of the
space that contains the space air temperature sensor. This value may be provided by wiring the
sensor to the unit or via a sensor value provided by the BAS.
The drawing below describes how the various temperature setpoints are calculated for space
temperature control. When the unit is in an occupied mode the active space temperature setpoint
is calculated based on the space temperature setpoint and the two setpoint offset values. In
unoccupied mode, the unoccupied heating and cooling setpoints are used as the active setpoint.
10
The BAS will change the state of the Filter Timer Reset Command object (BO 13) to the active
state. Upon the change to active state, the BCI-I will set the present value of the Filter Runtime
Hours object to zero and then set the Reset Command object back to the inactive state.
Table 9, p.
The BAS will change the state of the Diagnostic Reset to the active state. Upon the change to
active state, the IntelliPak control system will reset all internal diagnostics and set the state of
all of the diagnostic objects to inactive. Upon completion of this action, the BCI-I will set the
present value of the Diagnostic Reset Command object back to the inactive state.
Space air temperature control
Discharge air temperature control
31. The corresponding BI object will change state from inactive to
ACC-SVP01B-EN • BCI-I Integration Guide