Fuel Pressure Adjustment; Rupture Disk - Landa MHP4-3000 Operator's Manual

Step 4
After circulating solution flush entire system
with fresh water. Reinstall wand assembly to
spray gun.
Removal of Soot and Heating Coil
In the heating process, fuel residue in the form of soot
deposits may develop between the heating coil pipe
and block air flow which will affect burner combustion.
When soot has been detected on visual observation,
the soot on the coil must be washed off after following
the coil removal steps (See Coil Removal on page
17).

Rupture Disk

If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst, allow-
ing high pressure to be discharged through hose
to ground. When the disk ruptures it will need to be
replaced.
fuel
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel filter and drain tank every
100 hours of operation. Use No. 1 or No. 2 Heating
oil (ASTM D306) only. NeVeR use gasoline in your
burner tank. Gasoline is more combustible than fuel
oil and could result in a serious explosion. NeVeR
use crankcase or waste oil in your burner. Fuel unit
malfunction could result from contamination.
fuel Control System
These machines utilize a fuel solenoid valve located
on the fuel pump to control the flow of fuel to the
combustion chamber. This solenoid valve, which is
normally closed, is activated by a flow switch when
water is flowing through it. When an operator releases
the trigger on the spray gun, the flow of water through
the flow switch stops, turning off the current to the fuel
solenoid. The solenoid then closes, shutting off the
supply of fuel to the combustion chamber. Controlling
the flow of fuel in this way allows for an instantaneous
burn or no burn situation, thereby eliminating high
and low water temperatures, and combustion smoke
normally associated with machines incorporating a
spray gun.
CAUTION: Periodic inspection is recommended
to insure that the fuel solenoid valve functions
properly. This can be done by operating the ma-
chine and checking to see that when the trigger
on the spray gun is in the off position, the burner
is not firing.
16
PReVeNTaTIVe MaINTeNaNCe
LANDA MHP • 8.913-925.0 • Rev. 8/13

fuel Pressure adjustment

To adjust fuel pressure, turn the adjusting screw
clockwise to increase, counterclockwise to decrease.
Do not exceed 200 PSI.
NOTe: When changing fuel pump, a bypass plug must
be installed in return port or fuel pump will not prime.
5/32"
1/4"
electrode Setting
burner Nozzle
Keep the tip free of surface deposits by wiping it with
a clean, solvent-saturated cloth, being careful not to
plug or enlarge the nozzle. For maximum efficiency,
replace the nozzle each season.
beckett burner air adjustment
The oil burner on this machine is preset for operation
at altitudes below 1000 feet. If operated at higher
altitudes, it may be necessary to adjust the air band
setting. Adjust air band for a #1 or #2 smoke spot on
the Bacharach scale. A one-time initial correction for
your location will pay off in economy, performance,
and extended service life. If a smoky or eye-burning
exhaust is being emitted from the stack, two things
should be checked. First, check the fuel to be certain
that kerosene or No. 1 home heating fuel is being
used. Next, check the air adjustment on the burner.
fuel Pump
air
adjustment
Screw
electrode
Nozzle
5/32"
air band