Aqua-Hot™ Hydronic Heating System Shop Manual REV-A 03/02
3.2
Operational Flow-Chart
Section 3: Diesel-Burner Information
Section 3: Diesel-Burner Information
Section 3: Diesel-Burner Information
Section 3: Diesel-Burner Information
Section 3: Diesel-Burner Information
Diesel-
Burner
Operational
Flow-Chart
Page 6
~ Reference Figure 5 for all numbers indicated inside parenthesis. (i.e #8).
NOTE:
If the Aqua-Hot's Coolant
reservoir temperature is
approximately 175 degrees
Fahrenheit, or higher, the
"MOTOR" (#2) will not operate.
Only when the temperature has
dropped below 175 degrees
Fahrenheit will the "VDC
CONTROL THERMOSTAT"
(see Figure 4) allow the
"MOTOR" (#2) to operate.
Operation sequence once the
Aqua-Hot's Diesel-Burner
Control Switch is turned ON.
The Control Switch's indicator
light will illuminate.
The "MOTOR" (#2) (which
turns the "COMBUSTION AIR
FAN" (#5) and drives the
"FUEL PUMP" (#14)) will
begin to run.
After approximately 10 - 25
seconds the "FUEL
SOLENOID VALVE" (#6)
opens and fuel is sprayed
into the "COMBUSTION
CHAMBER" (#10) through
the "FUEL NOZZLE" (#9).
Once the Heater switches
OFF, thermostatically or
manually, the "FUEL
SOLENOID VALVE" (#6)
closes, which interrupts the
supply of diesel fuel to the
"FUEL NOZZLE" (#9).
SUMMARY:
The Aqua-Hot's Diesel-Burner is
operational anytime the operator
activates the Diesel-Burner
Control Switch to the ON
position. The Diesel-Burner will
then automatically maintain the
temperature of the coolant
without any additional
involvement from the operator.
The combustion process will
continue to operate in this
manner until:
A.) The "VDC CONTROL
THERMOSTAT", (see Figure 4)
(which senses Coolant Temp.),
reaches the preset temperature
of approximately 190 degrees
Fahrenheit.
B.) The Aqua-Hot's Diesel-
Burner Control Switch is turned
OFF.
NOTE:
When the Aqua-Hot Diesel-
Burner is switched OFF by the
"VDC CONTROL
THERMOSTAT" (see Figure 4):
A.) The "MOTOR" (#2) will
shut-off once the three (3)
minute "Purge-Cycle" has
expired.
B.) The Aqua-Hot's Diesel-
Burner will automatically turn
back ON once the coolant
temp. reaches the preset
temperature of approximately
175 degrees Fahrenheit.
Once the ignited Air / Fuel
mixture (FLAME) is observed
by the "FLAME DETECTION
PHOTOCELL" (#13), the
"IGNITION COIL" (#3) will
automatically switch OFF. The
combustion process now
continues to operate
unassisted.
Simultaneously the
"IGNITION COIL" (#3)
produces a High Voltage
Spark across the "IGNITION
ELECTRODES" (#8) which
ignites the incoming Air / Fuel
The "MOTOR" (#2) will
continue to run for
approximately three (3)
additional minutes. This is
called the "Purge-Cycle",
which cools down the Heater's
internal components and
purges the "COMBUSTION
CHAMBER" (#10) of any
residual exhaust gases.
