Operation – Using the Pump (continued)
22
4. Adjust
pressure as
needed
-Rotate the pressure adjustment knob until the sprayer is running at the
desired pressure.
1. Turn knob clockwise to increase pressure
2. Turn knob counter clockwise to decrease pressure
Note: If the pressure adjustment knob is completely tightened, the
pressure setting will be higher than the pressure switch on the pump.
This allows the pump to operate as a demand pump and turn on only
when spraying. See details below about pressure switch functionality.
The pressure switch reacts to outlet pressure, and interrupts power at the
preset shut-off pressure indicated on the pump label. When outlet pressure
drops below a predetermined limit the switch will close and the pump
operates until the shut-off pressure is achieved. The shut-off pressure is set to
factory calibrated standards.
Note: If the plumbing is restrictive or the flow rate is very low, the
pump may re-pressurize the outlet faster than the fluid is being
released, causing rapid cycling (*ON/OFF within 2 seconds). If the
pump is subjected to rapid cycling during normal operation, or for
infrequent periods, damage may occur. Applications which exhibit
rapid cycling should have restrictions in the outlet minimized.
Alternatively, a pressure accumulator may be used to reduce the
cycling rate.
5. Fluid bypass
In order to maintain a set pressure, the regulator discharges excess fluid
through the bypass port. The bypass port should be connected to the fluid
source via a 1/2” flexible hose (not provided). The 1/2” flexible hose should
be as short as possible with no bends or other restrictions.
6. Leaving
unattended
If the pump must be left unattended at any time
:
a)
Disconnect power to the pump.
b)
Relieve system pressure.
Bypass
line
Pressure
adjustment
knob