MANUALP/4000_SERVICE_0712 July2012
19
5 CHANGE the Temperature Set Point back to your normal setting, ie.
37°C
6LEAVE the enclosure (preferably without opening the doors) until the
CO
2
display stops flashing. This indicates that normal CO
2
control has
returned.
MAN-CAL
1 Flush the enclosure of CO
2
by opening the doors for at least 30 seconds.
2 Press and Hold the CO
2
button until the CO
2
display momentarily blanks.
3 Press both the TEMP and CO
2
buttons together until the display shows
[Cal].
4 Release all buttons and wait. The display will show [---] and beep. The
CO
2
display will automatically reset itself to [0.3%] when the current
temperature next reaches the Temperature Set Point.
NOTE AUTO-CAL and MAN-CAL will assume that there is no CO
2
in the
enclosure when the calibration sequence begins.
CO
2
SPAN CALIBRATION
As there is no facility to adjust the span of the CO
2
display, it is necessary to
check the CO
2
concentration by independent means and if necessary REPEAT
the AUTO-CAL procedure until satisfactory calibration is achieved.
CONTHERM recommends a FYRITE is used to check the CO
2
concentration.
Any other means that is satisfactory to the customer may be substituted.
1 Let the enclosure stabilise at its operating conditions for at least 6 hours.
2 Monitor the CO
2
level via the CO
2
SAMPLE PORT with the independent
CO
2
monitor ensuring that the CO
2
injection solenoid does not operate
during the sampling time. Note the reading of the independent monitor.
3 If the MONITOR value is within ± 0.5% of the DISPLAYED CO2 reading
no further action is necessary.
4 Repeat the AUTO-CAL calibration procedure until a satisfactory result is
achieved.
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