Sierra Products EasyFire B 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
minim um 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.

Figure 1

Figure 2

Figure 3

Brush holder with access

W e have found that a sm all quantity of motors have not im m ediately
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 minim ize further dam age to the unit. The fan motor condition is
easily corrected by dressing the brushes and reinstalling them.

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
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
blade (Figure 3)

Figure 4

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 m oto r 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 [phone]

www.sierraproductsinc.net

P/N Fan Motor Brush Service 08 10/08

Removing the brush caps: Using a small flat blade screw driver

remove one brush cap at a time. Care should be taken as the brush
holder has a spring that forces to the brush onto the arm ature. This

spring may cause
the cap to pop out
unless held firm ly

(Figure 5).

Removing and
dressing the
brush: Remove the

brush from the
holder by lifting up
and sliding the brush and spring clear (Figure 5). Once the brush is
clear hold the brush base and carefully take a couple of swipes across
the brush face with fine sand paper (Figure 6).

Figure 5

Figure 6

Figure 7

Carefully reinstall upper rear panel (Figure 8).

NOTE: WHEN SANDING THE FACE OF THE BRUSH DO NOT
REMOVE ANY MATERIAL. WE ARE ONLY SCUFFING THE
SURFACE TO ALLOW FOR BETTER BRUSH CONTACT.

Reinstalling the brush: Insert the brush back into the holder. Hold the
terminal tab into the holder. Carefully insert the cap and turn with a
small flat bladed screw driver. Use care not to cross thread the cap.
Once the cap is threaded lightly tighten against terminal tab (Figure 7).

Repeat service on lower brush.

Assembly:

Reconnect motor
wires to red and
black terminals.
Check fan blade for
bent blades by
spinning by hand. If
blades are not
aligned carefully
bend back into
place.

Figure 8

After completing the installation of the rear panel and tightening all the
phillips screws. Plug the heater back into AC power and test run by
running fan motor on “Fan” setting for 2 m inutes and then running on “Clean” for 30 seconds. Open hopper lid and run unit
through a beginning start up by pressing “Low” and allowing fan to ignitor and fan to start up. If all appears to activate
reinstall unit.

Additional information is available on line@ www.sierraproductsinc.net/pages/customer_service

Technical Customer Service - 909-399-3355x14

5061 Brooks St. Ste B Montclair, CA 91763

800-527-4790 Fax [phone]

www.sierraproductsinc.net

P/N Fan Motor Brush Service 08 10/08