Sierra Products MODEL EF 5000, MODEL EFI 4000, MODEL EF 3801 Removal And Replacement Of Components

REMOVAL AND REPLACEMENT OF COMPONENTS

WARNING: RISK OF ELECTRIC SHOCK! REMOVE ALL POWER CORDS FROM UNIT BEFORE ATTEMPTING ANY

SERVICE.

1.Circuit Board: The circuit board is located on the lower right hand side of the heater or insert (facing from the front fig.1 - pg. 21).

Rem oval from Heater: Rem ove the two #8 phillips screws securing the panel to the pedestal side. Open the panel by lifting up and out. Lay panel flat and rem ove two #8 phillips screws securing the control board stand-offs to the panel. Gently rem ove board from 44 pin connector by firm ly holding panel and pulling board toward you. Rem ove #8 nuts attaching stands to the board and rem ove stands (these nuts are located on the lower right and left corners of the board). Reverse the process to install new control board.

Rem oval from Insert: Rem ove the two #8 phillips screws securing the control cover from the hopper side.

Rem ove the two #8 phillips screws attaching the control board the stand-offs (these screws are located at the lower right and left corners of the board). Gently rem ove board from 44 pin connector by pulling down on the board. Reverse the process to install a new control board.

2.Fan Motor: The fan motor is located directly under the com bustion fan housing. Access is provided through the rear inspection covers on both the heater and insert. Rem ove the #8 screws attaching the covers. Rem ove the wire harness leads to the motor noting there position both red and black. Next rem ove the plastic convection fan blade by carefully pushing against the fan hub. Rem ove the four #10 nuts holding the fan motor base plate to the housing. Carefully pry the base plate breaking the factory silicon seal. Rem ove motor from unit. Using a long allen wrench loosen the allen set screws holding the com bustion fan blades on the motor shaft. Rem ove the two #10 nuts holding the motor mount tho the fan plate. Rem ove the two #8 phillips screws holding the motor mount to the motor. Reverse the process to replace fan m otor assem bly.

NOTE: WHEN INSTALLING THE COMBUSTION FAN BLADES ON THE MOTOR SHAFT, USE LOCK TIGHT (RED) ON THE ALLEN SET SCREWS. THE PROPER POSITION OF THE BLADES IS THE OUTER BLADE POSITIONED AT THE END OF THE SHAFT AND THE SECOND BLADE TIGHT TO THE BACK OF THE FIRST. WHEN ASSEMBLING THE FAN MOTOR PLATE BACK INTO THE UNIT, USE HIGH TEM PERATURE SILICONE SEAL ON CLEANED MATING SURFACES.

Fan m otor brushes m aybe replaced by carefully rem oving the plastic screw caps on each side of the motor and replacing with factory replacements.

3.Control Switch: The control switch is located on the right side of both the heater and insert. In both units rem ove the two #8 phillips screws holding the cover. Using a small blade standard screw driver carefully loosen the set screw on the control knob. Next rem ove the 9/16 nut attached to the switch shaft. Rem ove the switch and unplug the harness connector. Reverse procedure to install new

switch.

4.Transformer and Rectifier: The transform er and rectifier are located inside the cabinet on both the heater and insert. Rem ove the inspection cover on the rear and locate the transform er. Rem ove the two #6 phillips screws and nuts. Rem ove the wires noting the positions. Rem ove the transform er. The rectifier maybe rem oved by unplugging the wires from the harness and transform er (note the position of the red and black harness wires). Remove the #6 phillips screw and nut. Remove the rectifier. Reverse the procedure to install new parts.

5061 Brooks St. Montclair, CA 91763

909-399-3355 Fax 1-909-399-3357

www.sierraproductsinc.com

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