Saturn 125 - Page 86

Operator's Manual: Models Saturn™ 140 & Saturn™ 230
10-2
Main power ON
sending power to
both high limit
switches.
Burner cable
plugged in. Green indicator light ON.
L-150 Temp. Switch activates 250 watt block
heater element and heats the pre-heater block
INITIAL START-UP
Preheater thermostat cycles 250 watt block
heater element and maintains the block
temperature.
NORMAL BURNER OPERATION
When block temperature reaches 120 °F , the
F120 proving switch closes and sends power
to the oil primary control.
F120 proving switch remains closed and oil
primary control has power.
Oil primary control checks for
2000+ ohms from cad cell
indicating dark in the combustion
chamber (NO FLAME)
BURNER PRE-IGNITION SEQUENCE
Oil primary control relay closes.
Burner ignition sequence begins.
BURNER IGNITION SEQUENCE
14,000 volt igniter starts,
providing spark at
electrode gap.
Air solenoid
opens.
INITIAL START-UP
Air regulator adjusted to
proper psi of air pressure.
Air sensing switch closes
as it receives more than
10 psi of air pressure.
Pump circuit starts
oil pump.
Pump circuit opens
oil solenoid.
Air sensing switch
receives power from
centrifugal switch.
INITIAL START-UP
Combustion air band adjusted
for proper combustion air.
Centrifugal switch closes and
sends power to air sensing switch.
Burner motor starts and
reaches full rpm.
Burner ignites.
Oil primary control
receives <500 ohm signal
from cad cell indicating
proper ignition. Burner continues to run until the wall thermostat is satisfied.
FURNACE HEATING SEQUENCE
Fan switch on combustion
chamber senses temperature
rise as the burner fires.
Fan switch senses ON
temperature (180 °F) and
Fan switch closes.
Fan switch sends power
to Fan motor and fan starts.
Wall thermostat is
satisfied and T
circuit opens.
Primary control relay
opens and the burner shuts off.
Fan continues to run
to drive latent heat from the heat exchanger.
Fan switch senses OFF
temperature (160 °F) and
Fan switch opens.
Fan stops running.
FURNACE COOL DOWN SEQUENCE
Warm air delivered to heated area.
Wall thermostat calls for heat and
closes 24V thermostat.
FLOW CHART
SATURN 140/230
115 V / 60 Hz
I89111
Pump circuit starts
hour meter.
Flame is established
and igniter shuts off.