OPERATION
The refrigeration system, heater, and air circulating fan are used in conjunction with the
temperature control circuit to achieve sensitive temperature control. The temperature
sensor located in the air stream senses any temperature deviation from the control point,
and heat is provided to maintain desired temperature. The circulating fan provides even air
distribution throughout the chamber and assures temperature uniformity.
Regardless of the temperature maintained, the refrigeration system operates continuously.
This constant operation minimizes component failures which are more frequently
associated with a cycling type operation. Note that a factory set Low-Limit Thermostat will
shut off the compressor when temperatures reach around 1
C so samples will not freeze.
5.1
Plug incubator into electrical service corresponding to data plate rating located on
the side of the unit. Turn the power switch to the ON position and turn each
Overtemperature Thermostat to its maximum position, clockwise using a coin or
flat edged tool.
5.2
Place a certified reference thermometer (not supplied) in the center of the
chamber. Be certain the thermometer is not touching any shelving or chamber
walls. Taping the thermometer to a petri dish raises it off the shelf and keeps the
scale in view. Placing a reference thermometer in the chamber at this stage of
operation will allow for calibrating the control without the loss of processing time.
5.3
Loading Procedure:
Adequate spacing should be allowed between items
whenever possible. Proper spacing will allow maximum air circulation, which is
necessary for temperature uniformity.
5.4
Frost Buildup:
Excessive frost buildup on the evaporator coil located on the lower
rear wall can affect temperature uniformity. Liquid containers should never be
placed in the chamber without covers. The evaporation of moisture within the
chamber will only add frost and hasten the need for defrosting. Defrosting
instructions are available in section 6.0, Maintenance.
Section
5
