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17. Power Supply
The power supply is located at the bottom left side of the
appliance. It converts 120 volt AC current to 15 volt DC current
to power the appliance.
18. Overheat Sensor (Snap Disc)
The overheat sensor is mounted on the back of the drop tube
in the center of the appliance and has a reset button. To
access it remove the right side panel. If the fire tries to burn
back into the feed system or push exhaust up the feed tube,
this sensor will shut the appliance down, however the wall
control will continue to display messages. This sensor must
be manually reset. Disconnect power before resetting.
19. Thermocouple - Firepot
The thermocouple is located on top of the firepot inside
the thermocouple cover (ceramic protection tube). The
thermocouple sends a millivolt signal to the control board
telling the control board there is a fire in the firepot.
20. Thermocouple on Drop Tube
The thermocouple is located on the bottom of the drop tube
on the right side and is attached with a wing nut. It turns
the convection blower on and off, varies the speed of the
convection blower and will shut down the appliance if internal
heat exceeds set temperature.
13
12
11
Fuse 15A 120V,
under the cover
14
Figure 39.1
#
Description
1
Combustion Blower
2
Auto-Clean System
3
Feed/Auger Motors
4
Hopper/Door Switches
5
Auger/Auto Clean/Vacuum
Switches
6
Low Fuel
September 1, 2008
n/a
10
9
6
8
7
Fuse 15A 120V,
under the cover
15
16
17
#
7
Thermostat Wall Control
8
Combustion Blower (feedback)
9
Firepot Thermocouple
10
Drop Tube Thermocouple
n/a
Not Used
11
Convection Blower (feedback)
n/a
Not Used
21. Vacuum Switch
The vacuum switch is located on the right side of the
appliance under the feed motor behind the right side panel
and connects to the drop tube with a hose. This switch turns
the feed system on when vacuum is present in the firebox.
The vacuum switch is a safety device designed to shut off
the feed motor if the exhaust or the heat exchanger system
is dirty or plugged or if the firebox door is open.
22. Wall Control
The appliance is designed to run on a custom designed 3.3
volt DC thermostat wall control. It will not operate on any
other wall control. Refer to the instructions supplied with
the thermostat wall control.
23. Wiring Connections for Control Board
See Figure 39.1
24. Wiring Connection for Power Supply
See Figure 39.2.
Fuse 15A 250V
(need to remove
5
4
3
2
1
120V AC in
Figure 39.2
Description
7036-135E
Mt. Vernon Pellet Insert (AE)
cover)
120V AC out to
15V DC out to
Control Board
Control Board
#
Description
11
Convection Blower (feedback)
12
Igniter
13
AC Power In for Igniter
14
Convection Blower Power
15
Overheat Sensor (Snap Disc)
16
DC Power In from Power Supply
17
12 Volt Battery Back-up
Page 39
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