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7
Section 2 - Systems & Controls
Room Thermostat:
The room thermostat automatically controls the on/off operation of the heater according
to the setting of the desired room temperature. The thermostat works in conjunction with
the oil primary safety control.
Oil Primary Safety Control/Flame Sensor:
The oil primary control is mounted on top of the burner’s electrical box. When the thermo-
stat calls for heat the oil primary control starts the burner by switching on the air solenoid
valve, ignition transformer, combustion air blower, and the fuel pump. The oil primary control
works
with
the
flame
sensor (sometimes
referred
to
as a
cad
cell). The
flame sensor is
mounted inside the burner cover, and faces the flame. The flame sensor monitors
the light
level inside the combustion chamber to ensure a flame is present. If there is a loss
of flame
the primary control will go into its recycle mode. After a period of time, the primary control
will attempt to restart the burner. When this happens, if a flame is established, the
burner
will
continue
to
function.
If
on
start-up
no
flame
is
established
in
30
seconds
the primary
control will lock out, requiring the reset button to be pressed manually.
CAUTION:
Do
not
press
the
reset
button
more
than
twice.
If
the
burner
fails
to
function
properly, refer to
Section 13 - Trouble Shooting
.
Fan/Limit Control
The
fan/limit
control
monitors
the
temperature
of
the
air
inside
the
cabinet. When
the
air
reaches a set point (usually 120º F) it will switch on the heater fan. When the temperature in
the cabinet drops below set point (usually 90º F) the fan/limit control will turn the fan off. If
the temperature exceeds a fixed set point, (usually 200º F), it switches the burner (Oil Primary
Control) off until the temperature drops to a safe level. The burner will then restart.
CAUTION:
If the heater shuts down due to “High Limit” temperature conditions, the cause
must be determined and corrected before further use (over firing the unit is normally what
causes this condition).
The fan/limit control also features an external switch to turn the axial fan on manually, by-
passing its automatic function. The Fan/Limit Control is located on the top of the cabinet,
towards the front of the unit.
Barometric Draft Control
The Barometric Draft Control automatically maintains a pre-set chimney draft. It is located in
the chimney connector or flue.
Air Filter/Regulator
The Air Filter/Regulator performs two functions: It removes condensation and dirt from the
air
while
controlling
the amount
of
air
pressure
reaching
the
nozzle
and
air
operated
fuel
valve. The Air/Filter Regulator is mounted on the cabinet near the burner.
