Daewoo BH090, Manual

Page: 102 / 261

100
PREHEATER (OPTION)
Preheater operation
1. In the case that the ambient tem-
perature is below 0°C, push the
preheat switch (
ں
) about 20 sec-
onds for preheating the fuel noz-
zle, then push the operate
switch (
ڻ
).
(Preheat(
ں
) indicating lamp comes
on when the preheating of fuel
nozzle is finished)
The time of indicating lamp com-
ing on is different by ambient tem-
perature.
(The preheat temperature is about
30°C.)
2. By push the operate switch (
ڻ
),
the indicating lamps “operate (
ڻ
)”
and “pump (
ڼ
)” come on. Also
“drive motor” and “Water pump
motor” start operating. By the drive
motor operating, the blowing fan
and fuel pump work together.
3. Within 15
Ŕ
30 seconds after oper-
ating of “drive motor” and “water
pump motor”, the solenoid valve is
opened and fuel injection starts. At
the same time electric discharge
starts between the electrodes by
high current. Then the injected fuel
is ignited and combustion starts.
(The indicating lamp “combustion
(
ڽ
)” comes on).
4. After ignition, flame defector check
the condition of combustion and
stops the electric discharge
between electrodes.
5. When the temperature of coolant
reaches to 75°C, after normal
combustion, the solenoid valve
stops fuel injection by the thermo
sensor and the “combustion (
ڽ
)”
indicating lamp goes out.
After stop of combustion, the drive
motor operates 150
Ŕ
180 seconds
more, and stops but the water
pump motor continues operating.
(The indicating lamps “operate (
ڻ
)”,
“pump (
ڼ
)” keep lighting on).
6. At the condition of paragraph 5,
when the coolant temperature
drops below 65°C), the sequence
from paragraph 2
Ŕ
4 repeats auto-
matically and the heating of
coolant is maintained.
STOP
PREHEATER
1 2 3 4 5
1. Stop switch 2. Preheat switch
3. Operate switch 4. Pump switch
5. Combustion switch