Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 5: DIESEL-BURNER
Operational
Sequence
5.3
Operational Sequence
The following sequence illustrates how the Aqua-Hot’s
Diesel-Burner
operates once it is
activated. Also, if Diesel-Burner malfunctions are experienced, use the following
sequence of operating events as a diagnostic tool to determine the point in the
Diesel-Burner’s operation that the malfunction occurs. Use the
“KEY”
provided to
understand each symbol shown.
The
Fuel Pump
builds up pressure
against the
Fuel Solenoid Valve
. After
approximately 10-25 seconds, the
Fuel
Solenoid Valve
opens, and fuel is released into the
Fuel Nozzle
, then sprayed into the
Combustion Chamber.
Fuel Pump
Fuel Solenoid Valve
Fuel Nozzle
Combustion
Chamber
The particular component begins to operate.
The component is currently operating.
Diesel-Burner Operation
1
2
Diesel Fuel
(Supply and Return)
Motor
Combustion
Air Blower
Combustion
Air
NOTE:
The
Motor
and
Combustion
Air Blower
will begin to operate
only if the
VDC / VAC Control
Thermostat
is closed and calling
for heat; reference Figure 3.
Combustion Air
Diesel Fuel Spray
Exhaust Gases
When the
Diesel
switch is turned
ON
, the
Motor
and
Combustion Air Blower
begin to operate. This
process is referred to as the
prime-cycle
.
KEY
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