— Page 35 —
© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
S
ECTION
6: D
IESEL
-B
URNER
O
VERVIEW
Operational Flow-Chart
Operation sequence once the Aq-
ua-Hot’s
Diesel
switch is turned
ON
NOTE:
The
Diesel
switch’s indicator
light will illuminate anytime the
Diesel Burner switch is in the ON
position
The
Motor (#2),
which turns the
Combustion Air Blower (#5)
and drives the
Fuel Pump (#14
),
will begin to operate.
NOTE:
If the Aqua-Hot’s coolant temper-
ature is approximately 200°F (+/-
5°F) or higher, the Motor (#2)
will not operate. Only when the
coolant temperature has dropped
below 175(+/-5)°F, and the VDC
Control Thermostat is calling for
heat, will the Motor (#2) begin to
operate.
After approximately 10-25 se-
conds, the
Fuel Solenoid Valve
(#6)
opens and fuel is sprayed
into the
Combustion Chamber
(#11)
through the
Fuel Nozzle
(#9)
After approximately 10-25 se-
conds, the
Fuel Solenoid Valve
(#6)
opens and fuel is sprayed
into the
Combustion Chamber
(#11)
through the
Fuel Nozzle
(#9)
Once the ignited air-fuel mixture
(FLAME) is observed by the
Flame Sensor (#13)
the
Ignition
Coil (#3)
will automatically
switch
OFF
. The combustion
process now continues to operate
unassisted.
The combustion process will con-
tinue to operate in this manner
until one of the following occurs:
A.) The
VDC Control
Thermostat,
which senses cool-
ant temperature, reaches the pre-
set temperature of approximately
200 (+/-5)° F.
B.) the Aqua-Hot Diesel Burner
Switch is turned OFF.
NOTE:
If process “B” occurs, the
Diesel
Burner switch’s Indicator
Light
, on the Switch Panel will
go OFF.
Once the heater switches
OFF
,
thermostatically or manually, the
Fuel Solenoid Valve (#6)
closes,
which interrupts the supply of die-
sel fuel to the
Fuel Nozzle (#9)
The
Motor (#2)
will continue to run
for approximately three (3) addi-
tional minutes. This process is re-
ferred to as the
Purge-Cycle
, which
cools the heater’s internal compo-
nents and purges the
Combustion
Chamber (#11)
of any residual
exhaust gases.
NOTE:
When the Aqua-Hot’s
Diesel Burn-
er
is switched OFF by the
VDCControl Thermostat
, the fol-
lowing process will take place:
1. The
Motor (#2)
will shut off
once the three (3) minute
Purge-Cycle
has expired.
-THEN-
2. The Aqua-Hot’s
Diesel Burner
will automatically turn back
ON
once the coolant reaches the preset
temperature of approximately 200
(+/-5) °F
Summary:
The Aqua-Hot’s
Diesel-Burner
is
operational anytime the operator
moves the
Diesel Burner Switch
to
the
ON
position. The
Diesel-
Burner
will then automatically
maintain the coolant temperature in
the Aqua-Hot
Boiler Tank
without
additional involvement from the
operator.
Summary of Contents for AHE-100-02S
Page 1: ...SERVICE MANUAL 2011 Aqua Hot Heating Systems Inc AHE 100 02S ...
Page 2: ... Page 2 2011 Aqua Hot AHE 100 02S Hydronic Heating System Service Manual Rev B ...
Page 104: ... Page 104 2011 Aqua Hot AHE 100 02S Hydronic Heating System Service Manual Rev B ...
Page 105: ... Page 105 2011 Aqua Hot AHE 100 02S Hydronic Heating System Service Manual Rev B ...
