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7
L120 LOW LIMIT SWITCH
This limit switch is mounted on the exhaust blower housing and has 2 main functions:
Should the fire happen to go out, for any reason, this limit switch will shut the stove off when the exhaust
temperature drops below 120° F.
Upon starting the appliance, the AcuTron control board has a 15 minute “Lighting Mode”, if the stove
exhaust does not reach 120° F in that 15 minutes the stove will shut off. As soon as the stove
exhaust does reach 120° F, the limit switch opens and the AcuTron enters a 5 minute “Safety Delay”
mode.
F125 FAN LIMIT SWITCH
Your pellet appliance has a convection fan control limit switch. The room air fan's (F125) temperature limit
snap switch automatically operates the fan on high when your stove is producing heat faster than the fan is
carrying it into the room. This may occur when the heat control lever is set at [3 or 4] and the
FAN SPEED
is
set to a very low or off setting. After the fan runs at this automatic high setting a few minutes, it may cycle back
to its lower setting and may continue to cycle between [HIGH] and your selected setting. The circulation (room
air) fan cycling from high to low is a normal condition as well as a safety feature of your appliance.
To compensate for the fan cycling, adjust the FAN SPEED to a higher setting.
L250 HIGH LIMIT SWITCH
Your pellet appliance has a high temperature limit switch installed. If the temperature at the back of the firebox
reaches approximately 250° F., the switch will shut off the electricity going to the Vacuum Switch and to the
Auger Motor. The auger will automatically stop, and the appliance will shut down when the exhaust
temperature cools (120° F). If this happens call your dealer or Hearth & Home Technologies Customer Service
(1-877-427-3316).
IT IS IMPORTANT TO FIND THE REASON WHY THE UNIT OVERHEATED
.
VACUUM SWITCH
This safety device (mounted on the back panel pillar) detects vacuum in the exhaust system, firebox, and air
intake. If the exhaust blower fails, the vent pipe becomes plugged, the viewing door is open, or if you are out
of pellets, this switch will sense that there is a lack of vacuum and will stop the auger from continuing to feed
pellets.
HOPPER LID SWITCH
This device is mounted inside the
hopper and is connected to the
auger feed system.
If the hopper lid is
OPEN
the switch
WILL STOP THE AUGER FEED
SYSTEM
. This is to prevent fingers,
clothing or other objects from
coming in contact with the auger.
If the lid is left open, the green au-
ger cycle light will being to flash
rapidly and the stove will go into
shutdown.
If the power does go out, the
pellet appliance will stop run-
ning. When the power comes
back on, the stove will remember
the function it was performing
and return to that function.
Left Hand Side View / Exhaust Fan Side
AcuTron Wiring Harness
Air Intake
Vacuum Switch
Low Limit L120
High Limit L250
Fan Limit F140
Combustion Fan
Exhaust
Automatic Safety Features
Fan Limit F125
