308441ZAH 5
Installation
General Information
•The typical installation shown in FIG. 1 is only a guide
for selecting and installing system components.
Contact your Graco distributor for assistance in
planning a system to suit your needs.
•Always use Genuine Graco Parts and Accessories.
Refer to Product Data Sheet 305646.
•Reference numbers and letters in parentheses refer
to the callouts in the figures and the parts lists on
pages 25-26.
•Lift the pump by grasping the outlet manifold (1)
securely. See FIG. 3 on page 9.
Tightening Screws Before First Use
Before using the pump for the first time, check and
retorque all external fasteners. See Torque
Instructions, page 29. After the first day of operation,
retorque the fasteners. Although pump use varies, a
general guideline is to retorque fasteners every two
months.
Tips to Reduce Cavitation
Cavitation in a diaphragm pump is the formation and
collapse of bubbles in the pumped liquid. Frequent or
excessive cavitation can cause serious damage,
including pitting and early wear of fluid chambers, balls,
and seats. It may result in reduced efficiency of the
pump. Cavitation damage and reduced efficiency both
result in increased operating costs.
Cavitation depends on the vapor pressure of the pumped
liquid, the system suction pressure, and the velocity
pressure. It can be reduced by changing any of these
factors.
1. Reduce vapor pressure: Decrease the temperature
of the pumped liquid.
2. Increase suction pressure:
a. Lower the installed position of the pump relative
to the liquid level in the supply.
b. Reduce the friction length of the suction piping.
Remember that fittings add friction length to the
piping. Reduce the number of fittings to reduce
the friction length.
c. Increase the size of the suction piping.
NOTE: Be sure the inlet fluid pressure does not
exceed 25 % of the outlet working pressure.
3. Reduce liquid velocity: Slow the cyclic rate of the
pump.
Pumped liquid viscosity is also very important but nor-
mally is controlled by factors that are process dependent
and cannot be changed to reduce cavitation. Viscous liq-
uids are more difficult to pump and more prone to cavita-
tion.
Graco recommends taking all the above factors into
account in system design. To maintain pump efficiency,
supply only enough air pressure to the pump to achieve
the required flow.
Graco distributors can supply site specific suggestions to
improve pump performance and reduce operating costs.
Grounding
To reduce the risk of static sparking, ground the pump
and all other equipment used or located in the pumping
area. Check your local electrical code for detailed
grounding instructions for your area and type of
equipment. Ground all of this equipment:
WARNING
Hazardous fluid or toxic fumes can cause
serious injury or death if splashed in the
eyes or on the skin, inhaled, or swallowed.
1. Read TOXIC FLUID HAZARD on page 4.
2. Use fluids and solvents which are compatible with
the equipment wetted parts. Refer to the
Technical Data section of all equipment
manuals. Read the fluid and solvent
manufacturer’s warnings.
WARNING
FIRE AND EXPLOSION HAZARD
This pump must be grounded. Before
operating the pump, ground the system as
explained below. Also, read the section
FIRE AND EXPLOSION HAZARD, on
page 4.
