Data Aire dap4 touch, Инструкция по установке, эксплуатации и обслуживанию

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108 • dap4 User Manual
Note: Please do not enable any options that are not installed in the unit.
e) CO
2
high and Low level alarm limit settings
To access the CO
2
high and low level alarm set points, press Menu button and enter
service password (default is 0000). After entering the password advance to Menu-K
“Alarms and Limits” then move to the CO
2
Alarms screen. Here you can enable and adjust
the CO
2
alarm level thresholds as desired.
CO
2
Alarms
Low CO
2
Alarm: Yes
Set point: 100ppm (100-5000)
High CO
2
Alarm: Yes
Set point: 2000ppm (500-10000)
4) CO
2
control logic
CO
2
level control logic (when CO
2
control enabled).
i) The CO
2
level (in parts per million) appears on the main display along with other
system current conditions such as return air temperature and humidity.
ii) If the CO
2
level drops below the CO
2
set point, the output to the CO
2
valve is
energized and a “CO
2
valve on” message will appear on the main status screen.
The CO
2
valve is modulated on/off to control its duty cycle by the PWM rate (0-100% in
10s intervals). If the Valve PWM is set to 100%, the CO2 solenoid valve will turn on and
not modulate. The valve will be modulated for at least the “Min Valve On” time even if the
CO
2
level has risen. Once the CO
2
level rises above the CO
2
level set point plus CO
2
dead band the CO
2
valve will remain off.
An example of how CO
2
is controlled: let’s assure that the CO
2
set point is 1000ppm, CO
2
dead band is 25ppm, Min Valve on is 10 seconds and the Valve PWM is 20%. When the
CO
2
level falls below 1000ppm, the CO
2
solenoid will cycle on for 2 seconds then off for 8
seconds until the CO
2
level rises above 1025ppm.
iii) If the High CO
2
level alarm is enabled (Yes) and the CO
2
level rises above the
high CO
2
alarm set point, a “High CO
2
level” message is displayed and audio alarm will
sound (if not programmed for Silence). This alarm is a warning only and will not prevent
any of the unit functions from operating. The alarm will remain until the alarm condition is
corrected. The alarm output contacts will close if this alarm is selected “Yes” in the alarm
output function list in menu K.
iv) If the Low CO
2
level alarm is enabled (Yes) and the CO
2
level drops below the
low CO
2
alarm set point, a “Low CO
2
level” message is displayed and audio alarm will
sound (if not programmed for Silence). The alarm is a warning only and will not prevent
any of the unit functions from operating. The alarm will remain until the alarm condition is
corrected. The alarm output contacts will close if this alarm is selected “Yes” in the alarm
output function list in menu K.
v) CO
2
control during Day/Night schedule: If night CO
2
control is set to No (default
setting), CO
2
control will be off at night or when light sensor senses no light and back to
normal control mode during day schedule or light is on.