Owner`s manual

Hydro-Hot Hydronic Heating System Shop Manual 07/03
R
Page 9
Operation sequence once the
Hydro-Hot’s Diesel switch is
turned ON
.
NOTE:
The Diesel switch’s Indicator
Light will illuminate (reference
Figure 4), while the Hydro-Hot
Heating Status and Diesel-
Burner Status lights illuminate
on the Electronic Controller
,
reference Figure 5.
The Motor (#2), which turns
the Combustion
Air Blower
(#5) and drives the Fuel Pump
(#14), will begin to operate.
NOTE:
If the Hydro-Hot’s coolant
temperature is approximately
190 (+/- 5 deg.) degrees
fahrenheit, or highe
r, the Motor
(#2) will not operate. Only
when the coolant temperature
has dropped below 160 (+/- 5
deg.) degrees fahrenheit, and
the VDC /
VAC Control
Thermostat (see Figure 3) is
calling for heat, will the Motor
(#2) begin to operate.
After approximately 10 - 25
seconds, the Fuel Solenoid
(#6) opens and fuel is
sprayed into the
Combustion Chamber (#
11)
through the Fuel Nozzle (#9).
SUMMARY:
The Hydro-Hot’s Diesel-Burner
is operational anytime the
operator activates the Diesel
switch (reference Figure 4) to
the
ON position.
The Diesel-
Burner will then automatically
maintain the coolant
temperature in the Hydro-Hot’s
Boiler
Tank without additional
involvement from the operator.
The combustion process will
continue to operate in this
manner until one of the following
take’s place:
A.)
The VDC / VAC Control
Thermostat (see Figure 3),
which senses coolant
temperature, reaches the preset
temperature of approximately
190 (+/-5 deg.) degrees
fahrenheit.
NOTE:
If process "A" occurs, the Low
Temp Cutoff Status, Hydro-Hot
Heating Status, and Diesel-
Burner Status lights on the
Electronic Controller will go
OFF, reference Figure 5.
B.)
The Hydro-Hot’s Diesel
switch is turned OFF.
NOTE:
If process "B" occurs, the Diesel
switch’s Indicator Light, on the
Switch Panel (reference Figure
4), will go OFF along with the
Hydro-Hot Heating Status
,
Diesel-Burner Status, and Stir
Pump lights on the Electronic
Controller, reference Figure 5.
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.
Simultaneously the Ignition
Coil (#3) produces a high
voltage spark across the
Ignition Electrodes (#8)
,
which ignites the incoming
air-fuel mixture.
The Motor (#2) will continue
to run for approximately three
(3) additional minutes.
This
process is refered to as the
purge-cycle, which cools
down the heater’s internal
components and purges the
Combustion Chamber (#
11)
of any residual exhaust
gases.
NOTE:
When the Hydro-Hot’s Diesel-
Burner is switched OFF, by the
VDC / VAC Control Thermostat
(see Figure 3), the following
process will take place:
1.)
The Motor (#2) will shut-off
once the three (3) minute purge-
cycle has expired.
-THEN-
2.)
The Hydro-Hot’s Diesel-
Burner will automatically turn
back ON once the coolant
temperature reaches the preset
temperature of approximately
160 (+/- 5 deg.) degrees
fahrenheit.
Once the heater switches OFF,
thermostatically or manuall
y,
the Fuel Solenoid (#6) closes,
which interrupts the supply of
diesel fuel to the Fuel Nozzle
(#9)
.
5.2 Operational Flow-Chart
Section 5: Diesel-Burner
Operational
Flow-
Chart
~ Reference Figure 6 for all numbers indicated inside parenthesis. (e.g. #8).