Replacing The Outer Door Heater - Thermo Scientific 3403 Manual

Section 6
Maintenance and Repairs
Replacing the Outer
Door Heater
6-6 Midi 40 CO2 Incubator
1. Turn the power switch to "Off " and unplug the unit.
2. Remove the two Phillips screws that secure the door upper hinge cover.
Caution The outer door heater is still connected. Do not allow the door to
drop or be pulled away from the cabinet more than 4" (15cm).
3. Remove the two #2 Phillips upper hinge mounting screws and lift the
door off of the lower hinge. Carefully lay the door on top of the
incubator, gasket-side up.
4. Without tearing the gasket, carefully remove the ten (10) #2 Phillips
screws that secure the gasket and inner liner to the outer door.
5. Lift the inner liner and cut the heater wires next to the foil tape.
Caution The inner panel can be easily warped if the adhesive-backed heater
is pulled off too quickly or with too much "up" motion.
6. Carefully peel the heater off of the inner panel, using care not to
distort the panel. Discard the old heater.
7. Peel the backing off of the heater. Carefully align the heater with the
inner panel and apply.
Note To ensure maximum surface area contact for maximum heat transfer,
rub the exposed surface of the heater to ensure all air bubbles have been
removed.
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Caution The heater panel has 2 heaters built in. On 115V units, these two
heaters should be wired in Parallel.
8. Cut the wires of the new heater as short as possible, but still long
enough to connect with wire nuts.
9. Connect the new heater with wire nuts and install the new inner liner
and door in the reverse order.
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