46
2. Remove the access panels from the back corner of
the furnace and set aside.
3. If a one-pound propane cylinder is threaded onto the
regulator on the gas valve, remove it. Otherwise turn
off the gas supply at the appliance service valve.
4. Open the hopper lid and empty the hopper. One
option for emptying the hopper is to use a wet-dry
shop vacuum to remove the unused wood pellets.
Wood pellets at the bottom of the hopper may have
been saturated with water causing them to expand
and fill the opening. If it is necessary to use a tool
to break up the expanded wood pellets, use extreme
caution not to damage any components of the
furnace.
Remove Transfer Auger
1. Disconnect the wires from the transfer auger motor.
2. Remove the bolts securing the transfer auger motor
mount plate to transfer auger housing; then remove
the transfer auger assembly.
NOTE: Do not pull straight out or force the
transfer auger assembly while removing. Turn
the assembly counterclockwise.
3. Remove the screws securing the inspection window
to the side of the hopper; then remove the inspection
window.
4. Remove the 1/2" silicone tubing from the thermal
valve, leaving it attached to the discharge tube. Blow
air through the tubing to clean.
Remove Aerator, Burner Auger and Burner
Auger Motor
1. Inside the firebox, turn the aerator 1/4 turn
counterclockwise and pull straight forward to
remove.
2. Disconnect the burner auger motor wiring connector.
3. Remove the bolt and washer securing the burner
auger to the burner motor. Set the bolt and washer
aside for assembly.
4. Remove the four bolts securing the motor mount
plate to the transition box; then remove the burner
auger motor and motor mount plate.
NOTE: On M255 P models, the motor mount
plate is installed behind the gas valve mounting
bracket.
5. Remove the key from the keyway slot on the auger
shaft and set aside for assembly.
6. Using a wooden block, tap the burner auger into the
firebox. Do not hit the bushing.
7. Remove the burner auger from inside the firebox.
Clean the Affected Areas
1. Inspect the bottom of the hopper and remove any
wet fuel from the opening at the bottom.
2. Using a wet-dry shop vacuum, clean the transfer
auger tube and the drop tube of any unused fuel or
wet fuel; then clean the transition box that houses
the burner assembly.
NOTE: Make sure that no fuel gets pushed
back toward the combustion fan area or the
combustion fan could be damaged.
3. Make sure the flightings on the augers are clean and
dry.
Replace Snap Disc
1. Disconnect the two wires from the snap disc located
on top of the transition box.
2. Remove the two screws securing the snap disc to the
transition box; then remove the snap disc.
3. Place a new snap disc into place and secure with
screws; then connect the two wires.
Install Burner Auger, Burner Auger Motor
and Aerator
1. Apply grease to the portion of the burner auger shaft
that will be seated in the bushing; then, from inside
the firebox, install the burner auger into the burner
assembly making sure it is properly aligned and
seated in the bushing.
2. Install the motor mount plate with burner motor
behind the gas valve mounting bracket on the
transition box. Tighten the screws hand-tight only.
3. Align the keyway slot on the auger shaft with the
keyway slot in the burner motor; then tap the key
into the slot. Secure the burner auger with the bolt
and washer removed earlier. Tighten securely.
4. Using a flashlight inside the firebox, check that the
auger flightings are centered in the burner tube. If
necessary, loosen the motor mount plate bolts and
move the motor mount plate to center the auger
flightings in the burner tube. Tighten the motor
mount plate bolts securely.
Install Transfer Auger
1. Install the transfer auger assembly in the transfer
auger housing (see Fig. 64). Make sure the end of
the transfer auger tube fits over the brass guide in the
transfer auger housing. Verify by visually checking
from the top of the hopper (see Fig. 65). Secure with
the bolts.
Section 9 - Routine Maintenance
