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OPERATION: (Con’t)
SETTING OPERATING TEMPERATURE AND HIGH LIMIT SETPOINT, 314/316
SERIES AUTOMATIC CO2 INCUBATORS: (Con’t)
• After sufficient time has elapsed, rotate the high limit thermostat
counterclockwise while watching the red lamp. When the lamp is lit, you
have adjusted the high limit set point to be equal to the operating set point.
• Now rotate the high limit thermostat clockwise 30º of rotation beyond the
point where the lamp goes out. This distance should be similar to the
distance from the twelve o’clock to the one o’clock positions. This
establishes a buffer of a few degrees between the operating set point and
the high limit temperature setpoint allowing PID control to function
normally.
BE ADVISED UNDER NORMAL OPERATING CONDITIONS, THE High
LIMIT LED SHOULD NEVER COME ON. IF IT DOES, ROTATE THE
HIGH LIMIT THERMOSTAT SLIGHTLY CLOCKWISE—MISOPERATION
OF THE TEMPERATURE AND POSSIBLY CO2 CONTROL MAY OCCUR
IF THE HIGH -LIMIT IS SET TOO CLOSE TO THE SETPOINT.
CONDENSATION ON INNER GLASS DOOR, 314/316 SERIES AUTOMATIC CO2
INCUBATORS:
• After the unit has been operating, you can determine what, if any,
condensation is forming on the inner glass door. To dissipate
condensation, press the SET and DOOR HEAT keys to access this
function.
• Using the Up and Down arrow keys, select a value as a percentage of the
heater output. The door heater is about 50 watts; complete control of how
much effective heat will be applied is obtained by setting the door heat
percentage; each 1% translates into 0.5 watts of door heat.
For example: 10 will produce 10% of the available heating capacity.
As experience is gained through trial and error, users are able to select more
precisely the heating value required to remove any condensation.
As a general starting point, 30% at 37ºC may be selected.
• Correct setting of the door heat control depends on varying factors such
as chamber temperature. In general, the setting should produce the
minimal amount of heat necessary to eliminate glass door condensation
and no more. If unsure of the amount of heat to produce, start at a low
value and increment the setting by 5% every couple of hours until
condensation is eliminated. Once set, the door heat percentage need not
be changed again, unless you change the temperature set point
requirements. The setting chosen is stored in nonvolatile RAM memory in
case of power outages.
OPERATION: (Con’t)
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