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TranSystems Corporation - LGM Construction

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501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11<br />

or by cycling power to the unit.<br />

C. The BAS system shall provide alarm messages for the following VAV diagnostics. The VAV shall<br />

initiate a failsafe operational sequence based on the diagnostic condition.<br />

4.5 TROUBLESHOOTING<br />

Diagnostic Manual Reset required<br />

Discharge Air Temperature Failure Yes<br />

Low Air Flow Yes<br />

Primary Air Temperature Failure No<br />

Space Temperature Failure Yes<br />

Local Setpoint Failure No<br />

Flow Sensor Failure No<br />

A. Manual Output Test - The VAV shall be able to manually exercise all outputs for troubleshooting.<br />

This shall be done directly from the controller board with no need of additional tools.<br />

B. Unit Identification - The VAV shall have the capability of flashing an LED upon receiving a<br />

command from a service tool or BAS. The VAV shall also be able to send the unit address to a<br />

service tool or BAS for unit identification from the controller board or space sensor with no need of<br />

additional tools.<br />

4.6 COMMUNICATIONS<br />

A. Data Sharing - All VAVs shall be able to communicate in a peer-to-peer environment over a<br />

twisted pair of communications wire.<br />

B. Master/Slave - Master/Slave shall be used for operating multiple units from a single space sensor.<br />

The Master unit shall share space temperature, setpoint, heat/cool mode, occupancy, fan<br />

operation, and capacity control algorithm data over a twisted pair of communication wire to ensure<br />

seamless cooperation between the units.<br />

END OF SECTION 15900<br />

DIRECT DIGITAL CONTROL SYSTEM 15900-27

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