Graco 25T817, Instruction Manual

Page: 11 / 32

Operation
3A8570B 11
Operation
NOTE: When the system is not in use, always turn the
power switch (K), ( Component Identification , page 7)
located on the back of the motor, off. Failure to do so
can result in a spill if a hose ruptures or a leak occurs in
the system plumbing. If a leak occurs, the pressure in
the system will drop, signaling the pump to turn on.
See F
IG
. 4, page 7 for reference numbers in this section.
The on-demand dispensing pump turns on or off
depending upon the pump outlet pressure. When the
dispensing valve is open, the system pressure
decreases and the pump will begin pumping fluid.
When the dispensing valve is closed, the system
pressure increases and the pump will stop pumping
fluid.
1. Turn the power switch (K), located on the back of
the motor, ON.
2. Place the outlet of the dispensing valve into the fill
container.
3. Open the dispensing valve to the full open position,
until the desired amount of fluid is dispensed.
4. Close the dispensing valve to stop dispensing.
Pressure Switch
The pressure switch (C) ( Component Identification ,
page 7) is factory set to 470 psi (3.24 MPa, 32.4 bar).
Once the pressure in the system reaches 470 psi (3.24
MPa,32.4 bar), the pressure switch (C) opens and stops
the motor (F
IG
. 7).
Thermal Induced Pressure
Relief
The pump is equipped with a standard outlet check
valve (E) ( Component Identification , page 7). If a
check valve with thermal relief is required, purchase PN
133097 and replace the standard check valve (F
IG
. 7).
NOTICE
Do not operate the pump continuously more than 30
minutes in one (1) hour. Failure to follow these
instructions can result in damage to the pump.
F
IG
. 7