North Star M157594J, User Manual

Page: 11 / 20

Maintenance Instructions
11
Coil Descaling
In hard water areas, scale build-up within the heating coil
will occur.
Scale deposits will decrease the water
temperature rise and may eventually clog the heating
coil.
1. Mix coil cleaner in a 5 gallon bucket and elevate the
bucket so it is higher than the unloader.
2. Attach the high-pressure hose to the high-pressure
water outlet on the machine. Do not hook up the
spray gun.
3. Place the other end of the high-pressure hose in the 5
gallon bucket.
4. Attach a short length of hose to the garden hose inlet
on the pump.
5. Prime the pump by filling the hose with water, then
place the end of the hose in the bucket.
6. Run the pressure washer in cold mode for 1 to 3
hours re-circulating the cleaning solution.
Warning: Do not run the burner.
7. Dispose of the cleaning solution where it is not
harmful to animals or the environment.
8. Flush with fresh water and clean the inlet strainer
when finished.
Coil Desooting
Poor grades of fuel oil or inadequate combustion air will
cause heavy soot build-up on the outside surface of the
heating coil. These deposits will insulate the coil. This
will
restrict the airflow through the coil, further
aggravating the soot build-up.
Most coils will never require desooting.
However, to
desoot a coil...
1.
Wear protective clothing, goggles, and gloves.
2. Disconnect high-pressure hose on inlet side of coil
and thermostat on outlet side of coil.
3. Remove the lid and insulation lid from the heating
chamber and hoist the coil out. Be careful, the coil
weighs 125 lbs.
4. Clean the coil.
5.
Reassemble the coil to the machine. Make sure the
white insulation remains in place.
6. Reattach high-pressure hose and thermostat, and
make sure all fittings are tight before using the
machine.