7
Operation of the Carel pCO2 Microprocessor
The pCO2 microprocessor has a keyboard and display to allow the operator to view the status of various functions, set
parameters with authorization to up to three levels of security, and to troubleshoot problems that may occur.
Alarm (bell icon) - is used to view and alarm. An alarm is indicated when the button is illuminated in red.
Esc - is used to return to the Main Menu or go back one screen.
Up and Down arrows are used to scroll the display up or down, to toggle values, or to increase or decrease
Enter ( ) is used to move the cursor when changing setpoints or to accept a value entered.
Prg button is not used and is inactive.
Pressing the UP and Down arrows simultaneously will display the Main Screen that will display the HCU model and the
software version with version date.
*** MAIN MENU ***
STATUS
CURRENT ALARMS
DATE / TIME
USER SETTINGS
RUN TIMES These are the 10 fields that appear on the Main Menu
SERVICE SETTINGS
FACTORY SETTINGS
SENSOR CALIBRATION
DIG-IN CALIBRATION
MANUAL CONTROL
*** END ***
STATUS
The STATUS field has 7 screens that show the current status of all
digital outputs, analog inputs, and analog outputs.
CURRENT STATUS
Supply Fan: ON/OFF
Outside RH: XXX.X %
Outside Temp: XXX.X º F
OUTSIDE AIR STATUS This shows outside air enthalpy, a measure of total
heat content of the air.
Enthalpy: XX.X btu/lb
COMPRESSOR - STATUS
CompA: ON/OFF CompB: ON/OFF
Suct Press: XXX psi
Disc Press: XXXpsi
CONDENSER FAN STATUS This shows the % of full RPM of the reactivation and/or condenser
fan. REACTIVATION STATUS screen shows Current Setpoint for
discharge pressure, which is set for 220 psi for cool-only mode of
operation or 260 psi for DH mode. The React Fan Out
Wheel: ON/OFF
Current Setpoint: 340psi/444psi
React: 0 - 100.0% Cond: 0 - 100%
CURRENT STATUS
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