NorthStar M157310K.1, Installation, Operation And Maintenance Manual

Page: 14 / 26

14
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 air flow
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.
Clean Inlet
Strainer when
finished