57 • Mini dap4 User Manual
d) Enable CO
2
control and CO
2
at night control
The default settings are that CO
2
control is Yes and Night CO
2
control is No. To access
these CO
2
control functions, Press Menu button then enter the Factory level
password (default is 0002). Advance to Menu-J “Factory settings” and move to the
Options Installed screen. Here you can enable the CO
2
options as desired.
Options Installed
Electronic Valve: None
Power Meter: No
CO
2
Control: Yes (No)
Night CO
2
Cntrl: No (Yes)
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 CO2 Alarm: Yes
Set point: 100ppm (100-5000)
High CO2 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 CO
2
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.
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