SAFETY COMPONENTS
UNLOADER VALVE
The Unloader Valve allows all of the water delivered by the pump to return to the pump suction side. If the trigger
gun is closed or "OFF", the Unloader Valve goes into the "bypass mode" and the pump runs without pressure.
However, the pump may be SEVERELY DAMAGED, due to excessive overheating, if left running in the "bypass
mode" or "Gun-Off" situation for more than
6 minutes.
SAFETY RELIEF VALVE
The Relief Valve prevents the machine from being subjected to abnormally high pressures. If this situation occurs,
the valve will blow off relieving the pressure in the coil. This valve may also operate if the unloader is adjusted too
high.
PRESSURE SWITCH
The Pressure Switch ensures that there is pressure, and therefore there is water flow at the head of the pump.
This control does not operate at less than 300 psi. Therefore if the pump is on "bypass mode", the burner will not
operate.
THERMOSTAT
The built-in thermostat allows temperature adjustment up to 212°F.
HIGH TEMPERATURE LIMIT SWITCH
The High Temperature Limit Switch is a thermostat which is set at 230 F. This switch is not adjustable and will
only operate when other controls fail to keep the water temperature within the normal operating range. This switch
cuts the power to the fuel solenoid.
THINGS TO CHECK REGULARLY
1. Check for SYSTEM LEAKS. Leaks in the pressure side of the system can cause premature wear (or even
failure) of the pump. The WARNING signal for this kind of leak is "frequent" cycling of the Unloader.
("FREQUENT" means more than once every 2 minutes in the "Gun-Off" position.) Check the gun and swivel
joints for leaks.
2. Check the OIL LEVEL at least once a week. Add ONLY the type and grade of oil specified for this pump.
(See "Specifications and Features" sheet.)
3. CHANGE OIL as recommended.
4. After you use chemical additives, thoroughly FLUSH the system with clean water.
5. Inspect the POWER CORD regularly. Also check the POWER OUTLET SOCKET. For safety, replace worn or
damaged parts immediately.
6. Never run the washer without water. TURN WATER ON FIRST.
7. PROTECT FROM FREEZING! When transporting your washer in temperatures below 0°C (32° F)
WINTERIZE the pump, hoses and gun.
5
DEF SERIES
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