Pressure Relief Valve - Landa SLT Operator's Manual

Removal of Soot and Heating Coil
In the heating process, fuel residue in the form of
soot deposits may develop on 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 page 16).

Pressure Relief Valve

Each machine is equipped with a relief valve to relieve
pressure in the system when higher than normal op-
erating pressures are encountered or if the unloader
valve should fail. Unusually high pressures come from
an object plugging the spray nozzle. If operating pres-
sure is found to be normal and the relief valve continues
to leak, repair or replace valve. CAUTION: This valve
must be opened each year to check operation.
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. The ruptured disk needs to be inspected once
or twice a year for any obstructions.
Fuel
Use clean fuel oil/diesel 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 fuel 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
This machine utilizes a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. The solenoid, which is normally closed,
is activated by a flow switch when water flows through
it. When the operator releases the trigger on the spray
gun, the flow of water through the flow switch stops,
turning off the electrical 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 gives an instantaneous burn-or-no-
burn situation, thereby eliminating high and low water
temperatures, and combustion smoke normally asso-
ciated with machines incorporating a spray gun.
CAUTION: Periodic inspection, to insure that the
fuel solenoid valve functions properly, is recom-
mended. This can be done by operating the ma-
chine and checking to see that the burner is not
firing when the spray gun is in the off position.
MAINTENANCE & SERVICE
Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
Fuel Pressure Adjustment
To control water temperature, adjust fuel pressure
by turning the regulating pressure 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.
ELECTRODE SETTING: WAYNE
Gap
3/16"
Top View
Periodically check wiring connections. If necessary to adjust
electrodes use diagram.
ELECTRODE SETTING: BECKETT
5/32" Gap
7/16"
1/16"
Electrodes
1/8"
1/8"
3/8"
2-7/8"
1/2"
Nozzle
Adapter
Side View
Electrode
Nozzle
15