Sierra Products EasyFire MODEL EFI 4000 - Manual (Page 28)

5061 Brooks St. Montclair, CA 91763
909-399-3355 Fax 1-909-399-3357
www.sierraproductsinc.com
28
REMOVAL AND REPLACEMENT OF COMPONENTS
W ARNING: RISK OF ELECTRIC SHOCK! REM OVE ALL POW ER CORDS FROM UNIT BEFORE ATTEM PTING 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 M otor: The fan m otor 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 m otor 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 m otor base plate to the housing. Carefully
pry the base plate breaking the factory silicon seal. Rem ove m otor from unit. Using a long allen wrench loosen the allen
set screws holding the com bustion fan blades on the m otor shaft. Rem ove the two #10 nuts holding the m otor m ount tho
the fan plate. Rem ove the two #8 phillips screws holding the m otor m ount to the m otor. Reverse the process to replace fan
m otor assem bly.
NOTE: W HEN INSTALLING THE COM BUSTION FAN BLADES ON THE M OTO R SHAFT, USE LOCK TIGHT (RED)
ON THE ALLEN SET SCREW S. 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. W HEN ASSEM BLING
THE FAN M OTOR PLATE BACK INTO THE UNIT, USE HIGH TEM PERATURE SILICONE SEAL ON CLEANED
M ATING SURFACES.
Fan m otor brushes m aybe replaced by carefully rem oving the plastic screw caps on each side of the m otor and replacing
with factory replacem ents.
3. Control Sw itch: 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 sm all 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. Transform er 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 m aybe rem oved by unplugging the wires
from the harness and transform er (note the position of the red and black harness wires). Rem ove the #6 phillips screw
and nut. Rem ove the rectifier. Reverse the procedure to install new parts.