19
Operation Instructions
IV.) Adjusting the Unloader Valve
The unloader valve determines the operating pressure of the pump. You can
adjust the pressure by turning the black knob. However, the unloader is factory
pre-set to the maximum system pressure.
V.) Safety Relief Backup
The safety relief or “pop-off” val ve is a backup safety feature located at the
bottom of the unloader valve. In the unlikely event the unloader malfunctions, the
safety relief valve is designed to be the weak link in the system and will open
before the pressure reaches a dangerous level.
VI.) Thermal Protector
The thermal protector or “pump saver” valve protects your pump from overheated
water. When the spray gun trigger is released, the pump
DOES NOT
stop
pumping. Water is recirculated through the unloader valve and by-pass hose.
The recirculating water heats up quickly. The thermal protector senses the
temperature of the water and discharges it at 140°F preventing pump damage.
NEVER
alter the unloader valve from the
manufacturer’s design. Excess pressures could cause
serious injury and/or pump damage. An y alteration
other than turning the black knob will void your
warranty.
If the safety relief valve ever discharges water, turn
the engine off and do not use the machine. See a
dealer or call Customer Service at 1-800-270-0810
.
