DeVillbiss Air Power Company D21684 warranty Chemical Flow Adjustment, Thermal Relief Valve, or or

OPERATING PROCEDURES (cont'd)

Chemical Flow Adjustment

Some pumps are equipped with an adjustable chemi- cal injector as shown here. Turn the chemical adjust- ment knob counterclockwise to increase the amount of chemical used and clockwise to decrease the amount of chemical used. If the knob is turned clockwise until it stops, the chemical injector will close and will not draw any chemicals/soaps.

Chemical Adjustment

DO NOT allow your unit to operate in bypass mode for more than two minutes at any time. Overheating of pump will cause damage to pump.

Thermal Relief Valve

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Thermal Relief Valve:

During normal operation, the water from your cold water supply circulates inside the pressure washer pump allowing the pump to maintain a desired operat- ing temperature. When you stop spraying water through your wand/lance and the engine is still run- ning, this is considered the by-pass mode.

When the unit is in the by-pass mode, the water circulation inside the pump begins to heat up. If the unit is left in the by-pass mode for more than two (2) minutes, the water temperature will rise to a danger- ous level and damage the internal components of the pump.

In an effort to prevent damage, pumps are equipped with a thermal relief valve. This valve will open when the temperature rises too high. This valve will then release a gush of water in an effort to lower the temperature inside the pump. Immediately after this occurs, the valve will close.

Shut Down Procedure:

1.If you have siphoned chemicals, siphon a bucket of clean water through the chemical hose. NOTE: Failure to do so will cause damage to the pump.

2.Turn engine off. See Engine Owner’s Manual.

NOTE: NEVER turn the water off with the engine running.

3.Turn water source off.

4.See Storage section in this manual for proper storage procedures.

Turn off Water

15 — ENG