AirTest TR9230 User manual

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1520 Cliveden Ave, Delta BC V3M 6J8 —2815 Ben Lomond Drive, Santa Barbara, CA 93105
P: 604 517-3888 —888 855-8880 —F 604 517-3900
www.airtesttechnologies.com —[email protected]
TR9230 VAV Zone Control For Temperature And CO2
Sequence Of Operation
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.
ïSpace temperature set point for occupied mode is established. (factory setting is
74ºF)
ïSetback set point is set for unoccupied or setback mode (factory setting of 78ºF)
ïUser adjustable temperature band is set (factory set at +-2ºF)
ïSelect 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.
ïTarget cfm per person ventilation rate is set (factory set at15 cfm/person) This will
establish the upper limit of the proportional control band for ventilation.
ïSelect range 100% (0-10 V) or 50% (0-5V) range for the combined CO2and
ventilation output. (Factory setting is 0-5 V)
Operation
1. The controller shall measure both space CO2and temperature, The controller will
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 CO2using a proportional control algorithm designed to provide a
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 CO2concentrations drop to a level where it is clear there is no
occupancy in the space (within 50 ppm of baseline concentrations). The system

2of 2
1520 Cliveden Ave, Delta BC V3M 6J8 —2815 Ben Lomond Drive, Santa Barbara, CA 93105
P: 604 517-3888 —888 855-8880 —F 604 517-3900
www.airtesttechnologies.com —[email protected]
shall begin to control to temperature of ___ºF intended for setback or unoccupied
mode.
6. When in setback mode the controller will revert to control temperatures at the
occupied mod set point if any of the of the following conditions exist: 1) if either
of the temperature adjustment buttons on the wall mount sensor/controller are
pressed the sensor will operate in occupied mode for 2 hours (setback reset), or
2) if CO2levels rise to levels greater than 50 ppm above outside levels or 3) the
controller shall also be able to receive a closed contact signal to allow control of
setback based on an external timer. A closed contact signal will indicate the
system should be in occupied mode.
Control Of Outside Air At the Central System
1. When outside conditions are such that outside air can be used for free
cooling, CO2based control of the air intake will be overridden by the call for
economizer based cooling.
2. The central outdoor intake will be designed to provide a minimum level of
ventilation during all occupied hours. This minimum setting on the air intake
should be ____% of the design ventilation rate for all zones served.
3. Each zone sensor/controller shall provide a CO2output that can be reported
back to a central system or used as a control signal for the outside air intake.
Regulation of outside air to the space shall be based on the single highest
CO2level received from all of the zones served.
4. The controller shall also be capable of providing a linear 0-10V analog
temperature signal for reporting or monitoring purposes by a central system.