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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
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5. Remove the heater element, leaving the mica insulator in place.
6. Insert the new element into position, making sure the insulating mica is between the element
and the heater plate.
7. Replace the element cover, using the four screws that were previously removed.
8. Replace the element reflector, making sure the washers that separate the reflector from the
cover are placed back into position. Screw into place.
9. Place the heater plate assembly back into position, ensuring the springs underneath the
heater plate are in place. Attach to the humidifier case using the three long screws that
were previously removed.
10. Connect the heater plate element, thermistor and thermal cutout harnesses to the power
PCB.
11. Close the case (section 7.2.8).
Replacing the Thermal Cutout
1. Open the case (section 7.2.1).
2. Disconnect the heater plate element, thermistor and thermal cutout harnesses from the
power PCB.
3. Remove the three screws holding the heater plate - see Figure 7.7.
4. Un-solder the two black wires attached to the thermal cutout.
5. Unscrew fasteners used to secure the thermal cutout, and remove.
6. Place new thermal cutout in position and fasten using screws provided.
7. Depress the thermal cutout's red button to ensure it is reset.
8. Solder the black wires that were previously disconnected to the contacts on the new thermal
cutout.
9. Place heater plate back into position, ensuring the springs underneath the heater plate are
in place. Attach to the humidifier's case using the three long screws that were previously
removed.
10. Connect the heater plate element, thermistor and thermal cutout harnesses to the power
PCB.
11. Close the case (section 7.2.8).