North Star M157594I - Manual (Page 33)

Operation
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3. You can apply chemicals with either warm or cold water. Check
chemical label. If warm water is specified, start burner according to
instructions provided below.
4. Apply chemicals by squeezing the spray gun trigger. The chemical
injector will draw the chemical into the water stream.
5. The chemical concentration of the spray can be changed by turning the
chemical adjustment knob located on the chemical injector.
6. Apply chemicals evenly to the cleaning surface. Never use more
chemical than is necessary to clean the surface.
7. Allow the chemicals time to react with the dirt before rinsing.
8. Prepare to rinse by changing to a high-pressure nozzle. Changing the
nozzle from the low-pressure black nozzle to a high-pressure nozzle
will stop the flow of chemicals into the water stream.
Refer to instructions for selecting and changing the nozzle in Step1,
"Connect Hoses, Water Supply, and Nozzle".
9. Rinse with high-pressure spray, either hot or cold, as instructed below.
Turn on burner
(If hot spray or
steam is desired) If HOT spray or steam is desired, turn on the burner:
1. First make sure vicinity is free of flammable vapors, dust, gases, or
other potentially combustible materials. Operate only where open
flame or torch is permitted.
2. Make sure there is fuel in the burner fuel tank.
CAUTION: Do not run the machine in hot mode without fuel in the
burner's fuel tank, or damage can occur.
3. Make sure the engine throttle is all the way open. If it is not, the engine
will not supply adequate voltage to the burner, resulting in smoke
coming from the heat exchanger during operation.
Turn the heat switch ON and adjust the thermostat to the desired
temperature.
WARNING:

NEVER attempt to immediately run or re-light the burner if it
doesn't ignite the first time. Unburned oil or gas may have
accumulated, causing potential explosion or fire hazard.

Do not attempt to set temperature limit above the preset limit.

Never touch hot burner surfaces and stay clear of burner exhaust.
All are very hot and will burn you.

Do not inhale burner exhaust. It contains dangerous carbon
monoxide that can kill you.
4. The burner will fire when the trigger is squeezed – follow instructions
for spraying.
Note:
If burner exhaust is white, adjust burner for peak performance. See