Adjustment Procedure - DeWalt DXH135HD Guide D'utilisation

ADJUSTING PUMP PRESSURE
Due to varying fuel viscosities and normal component wear the pump pressure
on this heater may need to be adjusted. The heater should only be operated at
the manufacturer's recommended burner setting.
Pressure Adjustment Screw
(located at the rear of the heater)

ADJUSTMENT PROCEDURE:

1. Fill fuel tank.
2. Start heater.
3. Locate the fuel pressure adjustment screw. The pressure adjustment screw
is located at the rear of the heater, in the air filter housing cover (slotted
adjustment screw approx.10 o'clock position).
4. The plug directly under the adjustment screw can be used to install a
pressure gauge. It is not a second adjustment screw.
5. Using a flat bladed screw driver, turn the pump pressure adjustment screw
clockwise to increase pump pressure and/or counter-clockwise to decrease
pump pressure. Base pump pressures can be found in the specifications
chart on page 3 of the "Operating Instructions and Owners' Manual".
6. For best results, the nose cone in the combustion chamber should be cherry red
with no dark spots and the flame should not extend beyond the nose cone.
IMPROPER PRESSURE ADJUSTMENT
Problem: Heater does not have a strong consistent flame.
Heater smokes and spits raw fuel.
Nose cone does not get cherry red.
Adjustment: Pump pressure is too low.
Turn adjustment screw clockwise to increase pump pressure.
Problem: Flame extends beyond the end of the heater.
Adjustment: Pump pressure is too high.
Turn adjustment screw counter clockwise to decrease pump pressure.
Daily Maintenance Schedule
1. GENERAL. Make general visual inspection of heater for loose or damaged
parts. Check nuts and bolts to insure against looseness caused by vibration or
rough handling. Damaged parts should be repaired or replaced before using
heater again. Check heater operation to be sure it is operating normally (See
"Servicing" section for description of normal operation).
2. FILTERS. Dirty air or fuel filters will cause an imbalance in the air-fuel mixture.
The best indication that this condition exists is an increase in odors or difficulty
getting your heater to ignite. This heater should never be operated without the
filters in place. If required, clean filters as described under "500 Hours" and
"Annual Schedules".
500 Hour Maintenance Schedule
1. AIR INTAKE FILTER. Remove and wash the filter element with a mild detergent,
dry thoroughly and replace. Do not oil the filter element. If your heater is
used where there is considerable dust or dirt, clean as often as necessary
(approximately every 50 hrs.).
2. REMOVE DUST. Clean heater twice a season (more often under dusty
conditions). Remove accumulated dust from the transformer, burner, motor and
fan blades with compressed air. Wipe area clean with a clean dry cloth. Inspect
area to insure all foreign materials are removed, especially around the burner
and combustion area.
3. CAD CELL. Clean the glass portion of the cad cell with a soft dry cloth.
4. NOZZLE. Accumulation of dirt from fuel and carbon from the compressor vanes
will eventually fill up the passages in the nozzle, resulting in reduction of fuel
and air flow. Pressure will gradually increase giving improper fuel-air mixture and
excess odor and smoke. If this occurs, replace the fuel nozzle.
5. FUEL TANK. Clean twice a season (during frequently used periods, clean twice
a month). Drain and flush the fuel tank with clean fuel oil.
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