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 scale remover in a 5 gallon bucket and elevate the bucket so it is higher than the pump.

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.

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Clean Inlet Strainer

When Finished

6.Run the pressure washer in cold mode for 1 to 3 hours recirculating 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.Remove the fittings from the inlet and outlet of the coil.

3.Remove the lid from the heating chamber and hoist the coil out. Be careful, the coil is very heavy.

Important: Be careful not to damage the threads on the coil inlet and outlet. If the threads get damaged, it will be hard to reconnect and seal the fittings on the coil inlet and outlet.

Lid

Insulation Cap

Heating Coil

Heating Chamber

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Short High

 

Pressure Hose

4.Clean the coil.

5.Reassemble the coil to the machine. Make sure the white insulation remains in place.

6.Make sure all fittings are tight before using the machine. Use thread sealant on all threads.

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North Star M157305G specifications Coil Descaling, Coil Desooting