37
OPERATION:
(Con’t)
SETTING OPERATING TEMPERATURE AND HI-LIMIT SETPOINT: (Con’t)
•
After this time has elapsed, rotate the HI-LIMIT thermostat
counterclockwise while watching the red lamp. When the lamp is lit, you
have adjusted the
HI-LIMIT
set point to be equal to the operating set point.
NOTE:
DO NOT LEAVE HI-LIMIT AT THIS SETTING
•
Now rotate the
HI-LIMIT
thermostat clockwise 30 degrees of rotation past
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 HI-LIMIT temperature set point and
allows PID control to function normally.
NOTE:
UNDER NORMAL OPERATING CONDITIONS, THE
HI-LIMIT LED
SHOULD
NEVER
COME ON. IF IT DOES, READJUST SLIGHTLY CLOCKWISE.
CONDENSATION ON INNER GLASS DOOR:
•
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. Heat will be applied by setting the door heat percentage.
Each % 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, you will be 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 and whether or not you choose to add water
(humidity) into the chamber. In general, the setting should be to 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 and/or your
humidity requirements. The setting you choose is, of course, stored in non-
volatile RAM memory in case of power outages.
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