XtremeMac XGC-1e - Manual (Page 8)

F
Uzzy
l
ogic
™ co2 c
ontrol
(c
ontinUed
)
c
hanGinG
c
onTrol
m
odes
(c
onTinued
)
Changing to ON / OFF control mode
1) Press and hold the (SEL) pushbutton for three seconds. (P will be displayed)
2) Press the (SEL) button momentarily. (The current proportional band setting will be displayed = 5.0)
3) Using the (Down) pushbutton, change the display to read (0.0)
4) Momentarily press the (SEL) button to accept the change.
5) Allow the unit to re-start by not touching any of the buttons for approximately 30 seconds.
Changing to “Fuzzy Logic” control mode
1) Press and hold the (SEL) pushbutton for three seconds. (P will be displayed)
2) Press the (SEL) button momentarily. (The current proportional band setting will be displayed = 0.0)
3) Using the (Down) pushbutton, change the display to read (5.0)
4) Momentarily press the (SEL) button to accept the change.
5) Allow the unit to re-start by not touching any of the buttons for approximately 30 seconds.
* Note: There are several other “hidden” internal parameters that are normally locked-out from the user. These setting are critical in
order for the unit to function properly. DO NOT change any of these settings! If you mistakenly access these “weird” numbers reset the
unit. To reset the unit, unplug the main power cord for 20 seconds and re-connect.
c
alibraTion
The XGC-1e is factory calibrated. The sensor onboard the XGC-1e is capable of remaining in calibration for a minimum of three years.
Extreme shock during shipping and other factors may affect the calibration. To check the calibration, follow the procedure below.
Supplying the unit with outside air can quickly verify the calibration. The reading outdoors should be around 250-550PPM. If the XGC-1e
calibration is incorrect, the unit can be returned to the manufacturer. Please note:
• The XGC-1e CO
2
sensor has built-in temperature compensation that automatically corrects the reading depending on the ambient
temperature. However, extreme temperatures of below 20°F or above 120°F may affect the reading.
• Checking calibration in urban areas usually results in higher ambient CO
2
readings due to car exhaust and human activity.
To check calibration:
1) Bring the unit outside so that it will receive fresh air. Do not locate the unit in direct sunlight.
2) Plug the power supply and power cord into 120vac.
3) Move away from the controller to allow the reading to stabilize for approximately 20 minutes.
4) Check the CO
2
level.
*Important: Do not breathe while checking the calibration the unit. As you exhale, large concentrations of CO
2
are expelled from your
lungs. This higher level of CO
2
will affect the calibration of the unit. Try to hold your breath!
5) If the level is between 250 and 550 the unit is performing fine. If it is outside that range, allow the unit to stabilize longer.
6) If the calibration is still off, the unit can be returned to the factory for re-certification.