AirTest TR9230 User Manual

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TR9230 VAV Zone Control For Temperature And CO

Setup

The sensor shall have the following preset but adjustable parameters that can be

adjusted through use of on-board keypad and display or via a PC interface. These

settings can also be preconfigured for the user by AirTest™ or a AirTest™ distributor.

Space temperature set point for occupied mode is established. (factory setting is

74ºF)

Setback set point is set for unoccupied or setback mode (factory setting of 78ºF)

User adjustable temperature band is set (factory set at +-2ºF)

Select lowest allowable temperature (factory set at 3ºF below setpoint). This will

establish the point at which space ventilation will be limited to prevent over cooling of

the space.

Target cfm per person ventilation rate is set (factory set at 15 cfm/person) This will

establish the upper limit of the proportional control band for ventilation.

Select range 100% (0-10 V) or 50% (0-5V) range for the combined CO

ventilation output. (Factory setting is 0-5 V)

Operation

1. The controller shall measure both space CO

provide a modulation control signal to the VAV box actuator or fan based on the

maximum value calculated for either temperature control using a PI control

algorithm or CO

predetermined target cfm/person to the space (e.g. 15 cfm/person).

Temperatures for normal occupied mode shall be ___ºF . And zone ventilation

shall be controlled to ___ cfm/person.

2. If the demand for ventilation causes the temperature to drop below set point, the

controller shall provide a binary closed contact signal intended to activate a

heating coil in the VAV box to prevent over cooling of the space and to maintain

set point.

3. The controller shall also be designed to override the demand for ventilation if the

space temperature drops ___ ºF below the temperature setpoint.

4. Manual push buttons on the wall mount controller shall allow users to control the

deviation of the temperature setpoint adjustment to a limit of +/- ___ degrees

from the set point programmed into the controller. This adjusted setpoint will be

maintained until the system reverts to a setback mode. Upon returning from

setback the sensor shall control temperature based on the original programmed

setpoint until the buttons are adjusted again.

5. If indoor CO

occupancy in the space (within 50 ppm of baseline concentrations). The system

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Sequence Of Operation

using a proportional control algorithm designed to provide a

concentrations drop to a level where it is clear there is no

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888 855-8880

and temperature, The controller will

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and