Bird Technologies 8890-320 Series - Manual (Page 29)

17
Replacing the Load Resistor
1. Remove the vent plug.
2. Install the shipping plug.
3. Stand the unit on its back with the connector end up.
Note: In this position there is no danger of the coolant pouring out through
the socket plug hole.
4. Unscrew and remove the clamping band.
5. Lift the load resistor assembly out of the tank.
6. Allow any coolant to drip back into the tank.
7. Check the O-Ring.
Note: It should be free of twists and positioned evenly around the flange of the
resistor housing.
Note: If the O-ring shows signs of deterioration (e.g. is no longer pliable or has
surface cracks) replace it.
8. Replace the entire load resistor assembly.
Note: It cannot be further disassembled.
9. Put the clamping band in place and tighten it.
10. Remove the shipping plug.
11. Install the vent plug.
Replacing the Fan
1. Remove the four 8-32 pan head screws from the front and back of the base frame.
2. Pull the fan guard straight off the bottom.
3. Carefully unsolder the color coded connecting wires.
Note: Note the connections for resoldering.
4. Remove the four fan mounting screws.
5. Remove the defective fan.
Note: Be careful not to lose the lipped retaining washers.
6. Insert the replacement fan with the fan blade assembly facing down, towards the fan
guard grill.
7. Insert the mounting screws and retaining washers into the mounting holes.
8. Turn the washers so that the lipped portion fits over the rim of the fan frame.
9. Tighten the screws.
Note: If the fan replaced is the one closest to the power socket, reattach the
green ground wire to the closest mounting screw.
10. Solder the connecting wires to the solder lugs on the motor unit according to the
color coding.
11. Replace the fan guard and screws.
Note: Before reattaching the blower assembly to the load, check the fans for
free and unimpeded movement of the blades.
12. Connect the unit to AC power.
13. Set the switch to MANUAL.
14. Ensure that the fans work properly.
15. Set the switch back to AUTOMATIC.
WARNING
Disconnect the unit from all power sources before servicing. The unit may be
energized from multiple sources. The potential for electric shock exists.