Heating Operation - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Vav controller

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Installation manual (12 pages)

Table Of Contents

100

101

102

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110

Table of Contents

Sequence of Operations

Heating Operation

Under space temperature control, during the heating mode (communicated heat/cool

mode is heat), the controller attempts to maintain the space temperature at the active

heating setpoint. Based on the controller occupancy mode, the active space heating

setpoint is either the occupied heating setpoint, the occupied standby heating setpoint,

or the unoccupied heat setpoint. Reference

operation during occupied heating and cooling. All ventilation requirements are in force

during occupied heating and cooling.

The outputs are controlled based on the unit configuration and the required heating

capacity. At 0% required heating capacity, the air valve is at its minimum flow setpoint.

As the required heating capacity increases, the air valve opens above its minimum

position. At 100% required heating capacity, the air valve opens to its maximum position.

All units have a modulating air valve. The modulating air valve is used to control how

much air is flowing through the diffusers and into the space. By modulating the volume

of air flowing, the unit heating capacity is modulated.

Units may also have local or remote reheat. This reheat may be hydronic or electric.

Reheat is used to maintain the space temperature at the heating setpoint. For more

information on reheat, refer to

Table 30.Controller operation during occupied heating and cooling

PAT

(a)

Space Temperature

Cold

< Active Heat Stpt

HSP < ZT < HSP + 2

> Active Cool Stpt

Warm

< Active Heat Stpt

HSP < ZT < HSP + 2

> Active Cool Stpt

"Reheat Control" on page

Primary airflow control active minimum

airflow setpoints

At the highest min position:

• Local heat min airflow

• Min airflow