Sierra Products Electric Heater B Model User Manual

B Model Fan Motor Brush  
Service Instruction  
OVERVIEW  
The EasyFire heater is equipped with a long life DC fan motor (Figure  
1). This motor utilizes a special brush material that may require  
additional break in time to properly wear in or seat the brushes. When  
the motor is new the brush has a contoured end that allows for  
minimum contact initially to facilitate the break in. As this wears the full  
width of the brush begins to contact the armature allowing for proper  
operation.  
We have found that a small quantity of motors have not immediately  
seated the brushes causing a motor fault light (Red Flashing LED) on  
the control panel. The motor fault condition requires the unit to be  
powered down (unplugged) to clear. This condition may also be the  
result of a feed jamb. The control system is designed to address both  
inoperative fan and feed motor in the same manner to protect the user  
and minimize further damage to the unit. The fan motor condition is  
easily corrected by dressing the brushes and reinstalling them.  
Brush holder with access  
Figure 1  
Testing for a fan motor brush problem is accomplished by two  
methods. After recycling the heater by unplugging and reestablishing  
power. Press the “Fan” switch only. If the fan runs push the Clean  
button and allow the motor speed to increase to full speed. If the “Red  
Safety Light” does not light then the fan motor is generally considered  
in proper operation. If pressing the Off button then pressing a run  
button such as Low provides a short period then a flashing “Red Safety  
Light” the feed may be jambed. This can be cleared by removing pellets  
from hopper and removing access cover. If the safety light operates on  
“fan or clean” then accomplish the following service.  
Tools Required: #2 Phillips screw driver, medium flat blade, small flat  
Figure 2  
blade, #200 or fine sand paper strip (Figure 2).  
Accessing the  
motor for brush  
service: The fan  
motor is accessed  
from the rear of the  
heater by removing  
the phillips screws  
on the upper and  
lower rear access  
panels. Once the  
panels are free tilt  
the upper panel to  
the rear allowing the  
fan shroud to clear  
the convection fan  
Figure 3  
Figure 4  
blade (Figure 3)  
Removing the wire harness connections : Using care not to bend the fan blade, carefully use a flat blade screw driver  
to help pry off the red and black motor wire terminals (Figure 4). Note the brush holders have a corresponding red and  
black base to confirm wire connections.  
5061 Brooks St. Ste B Montclair, CA 91763  
800-527-4790 Fax 1-909-399-3357  
P/N Fan Motor Brush Service 08 10/08  
 

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