Number of Zones Controlled by CCP III Changeover Bypass and Delivered VAV

 

Issue:

Number of Zones Controlled by CCP III Changeover Bypass and Delivered VAV

Resolution:

For Changeover Bypass System VAV-SVU01A-EN page 9: 

The VariTrac comfort control system brings individual temperature control to each comfort zone in a building while using the same single-zone airconditioning unit. VariTrac varies the flow of supply air to each zone, providing the heating and cooling capacity required. The VariTrac changeover-bypass VAV system includes the following components:

VariTrac central control panel (CCP)

Communicating sensorbypass control assembly

Main supply duct bypass damper(s)

VariTrac zone dampers with unit control module (UCM) and zone temperature sensor

The CCP provides coordination, monitoring, and diagnostics for the VariTrac zone-control system. It is responsible for communicating with the zone dampers to determine space heating and cooling requirements, and selecting the mode and number of stages for the heating and cooling unit to meet those needs. The VariTrac CCP is designed to provide coordinated control of up to 24 VAV zones and one air-handling unit. The CCP can be controlled and monitored from an upper level system such as a Tracker Version 10. VariTrac can also function as a stand-alone device with its occupied/ unoccupied function initiated by the time clock built into the CCP operator display, or by a binary input from an external time clock or other contact closure.

For Delivered VAV System, VAV-SVU01A-EN page 35:

 

Delivered VAV describes a small-tonnage VAV system made up of three Trane product families:

Voyager Commercial 27 to 50-ton VAV packaged rooftop unit

Up to 32 VariTrane VAV boxes with DDC controls

VariTrac central control panel with operator display

Delivered VAV only applies to this combination of Trane products. The heart of the delivered VAV system is the VariTrac CCP, which must include the operator display. The CCP acts as the communications hub of the system. It is responsible for coordinating the actions of both the VAV rooftop unit and the VAV boxes to meet zone comfort requirements. The Voyager rooftop unit must be a VAV model with factory-installed inlet guide vanes or variable-frequency drive, microprocessor controls, and Trane communications interface. Delivered VAV supports up to 32 VariTrane, pressure-independent VAV boxes with the DDC controls. They can be single-duct boxes or fan-powered boxes, and can have factory-installed local heat, if desired.

 

Other Question/Problem/Cause Statements:

• Maximum number of zones controlled

Facts:

• VARITRAC III CENTRAL CONTROL PANEL (CCP)
• VariTrac III Central Control Panel (CCP)

Original wave: wave6326