Technical Support Document 032 - 1/97

REPLACING THE STARLITE 55 FAN CONTROL THERMOSTAT

The Starlite 55 Colorhead uses a single fan to cool it's three lamps. Since this fan is controlled by a thermostat, it will turn on and off during operation. Having the fan run only some of the time, rather than constantly, reduces the amount of dirt that collects inside the enclosure.

Occasionally, the contacts inside the fan thermostat will become dirty and will begin to cause electrical noise when the fan tries to turn on. This electrical noise can cause numerous problems with the normal operation of the Starlite colorhead, and any other electrical appliances nearby, like an AM radio. In fact, a good way to check the thermostat's condition is to place an AM radio near the Starlite. The radio will issue a short burst of static whenever the fan turns on or off, if the thermostat is bad. A good thermostat will cause only a small click from the radio.

REPLACEMENT OF THIS THERMOSTAT IS AS FOLLOWS

1. Open the door of the Starlite colorhead and remove the filtration transport assembly.
2. Remove the cover that houses the three lamps.
   

3. On the filter transport junction board, locate the two wires that go to the fan thermostat. The positions of these wires are labeled "FAN THERM" on the circuit board. See the picture below.
   

Use a small (1/8-inch) flat-blade screwdriver to loosen the two appropriate screws, and pull the wires from the green terminal strip.

4. Locate the thermostat mounted near the lamps. It is mounted in a small plate alongside the lamp-overheat thermostat. Be sure you have the correct thermostat, and pull it out of the mount.
5. Route the wires from the new thermostat through the hole in the thermostat mount plate and then through the larger grommet with all the other wires in it. You may want to remove the thermostat mounting plate to do this.
6. Once the wires are routed through the mounting plate and the main grommet, slide the new thermostat into final position in the mounting plate. It should be positioned as shown in the picture above, right.
7. Insert the new thermostat's wires into the terminal strip, and tighten the screws. Check these connections to be sure that the wires are firmly attached to the strip.
8. Re-install the lamp cover on the filter transport and replace the transport into the Starlite enclosure.
9. Turn the head on and verify that it works properly.