Sentinel CHHC-1 Instruction Manual - page 5
CO2 control modes
There are 2 CO2 “modes” of operation. One mode is used when
controlling CO2 generators, the other mode is used with
compressed CO2 that comes in high pressure tanks. Selecting the
appropriate mode before using the CHHC-1 is important for proper
operation. The CO2 outlet is only activated during the “daytime”.
CO2 Generators:
The default mode of operation is
gEnErAt
for CO2 generators. In
generator mode, the unit CO2 will be turned ON whenever the
CO2 level is below the desired setpoint. The CO2 Deadband is also
used in this mode. The deadband prevents the CO2 from turning
ON / OFF too quickly and is factory set at 50PPM. If the setpoint
is 1250 PPM, the CO2 outlet will be turned ON until it reaches
1300 PPM (1250 setpoint + 50 deadband = 1300 PPM) Once it
reaches 1300, the CO2 is turned OFF. Once the CO2 level drops
back to the setpoint of 1250 PPM, the CO2 is turned ON again and
the process repeats until the unit senses it is night time.
Compressed CO2 tanks:
The optional mode of CO2 operation is Fuzzy Logic mode
LogIcoN.
It is used ONLY when using compressed CO2. This is
because the logicon mode will be turning the CO2 device connected
to the CHHC-1 ON and OFF at short intervals to attempt to keep
the CO2 level inside the growing area as close as possible to the
setpoint. When the CO2 level is close to the setpoint, the CO2
outlet will be turning ON and OFF every few seconds, this is nor-
mal. When the CO2 level is either well below or well above the set-
point, the output will remain steadier either ON or OFF.
Pressing and holding the Enter / Reset button for 5 seconds will allow
you to select generator mode
gEnErAt
for CO2 generators or Fuzzy
Logic mode
LogIcoN
when using compressed CO2. Use the Up or
Down buttons to change the display to the desired mode. Press Enter to
accept the change.
NOTE:
The rapid cycling of the CO2 outlet would cause problems
if a CO2 generator was connected to the CHHC-1 in
LogIcoN
mode. Only use
gEnErAt
mode when using CO2 generators.
There are 15 buttons on the CHHC-1 . Below is a brief descrip-
tion, the next sections explain all of the functions in detail.
• Set CO2 PPM:
Press this button to display and change the
current CO2 Part-Per-Million setting
Factory setpoint 1250 PPM.
• Interlock CO2—Temp:
Press this button to select whether the
temperature and CO2 functions will be interlocked.
Factory setpoint Split.
• CO2 Dead-band:
Press this button to display and change
the current CO2 Dead-band.
Factory setpoint 50 PPM.
• CO2 Calibrate:
Press this button to re-calibrate the CO2
sensor. * Refer to the Calibration section.
Factory setpoint 380 PPM.
• Set Day Temp:
Press this button to set the Day Cooling and Heating
setpoint.
Factory setpoint Cooling 80’F / Heating 55’F.
• Set Night Temp:
Press this button to set the Night Cooling and Heating
setpoint.
Factory setpoint Cooling 70’F / Heating 55’F.
• Temp Dead-band:
Press this button to set the Cooling & Heating
temperature Dead-band setting.
Factory setpoint 3’F heat & cool.
•
Set Humid:
Press this button to set the Day and Night humidity
setpoints.
Factory setpoint 50 % rH.
• Interlock Humid—Temp:
Press this button to select whether the humidity
& temperature functions will be interlocked.
Factory setpoint Split.
• Humid Dead-band:
Press this button to set the Humidity
Dead-band setting.
Factory setpoint 3%.
• Humid Mode:
Press this button to select either humidification (rH Incr) or
dehumidification (rH decr) modes.
Factory setpoint rH decr
• Min / Max Recall:
Pressing this button repeatedly will recall the stored
measurements for Temp / Humid & CO2. Pressing and holding the
Enter / Reset button while the recorded value is displayed will reset the
Min / Max values.
• UP:
Press this button to display to increase the setting.
• Down:
Press this button to display to increase the setting.
• Enter/Reset:
Press this button accept and enter the new setpoint and also
to reset the Min / Max recorder values. (* Pressing and holding the Enter
/ Reset button also activates & deactivates the Fuzzy-Logic CO2 mode.)