• Minimize frictional losses by increasing the suction piping size
by one diameter.
• Use a minimal number of bends on suction piping, keeping
any bends a minimum of ten pipe diameters from the pump.
• Install a shut off valve on the suction line and a flow control
valve in the discharge line. Place the valves a minimum of ten
• pipe diameters from the pump.
• Ensure that the piping is leak free.
• Position the pump as close to the liquid source as possible.
• Maintain a flooded suction at all times or prime the pump and
maintain prime at all times.
CAUTION: Do not run the pump dry. This pump should
never be started without liquid in the casing.
The fluid being transferred by the pump lubricates the pump
components. Even short periods of running the pump dry
could damage the pump. It is recommended that run dry
protection be used.
Optional electronic power monitors are available to help pro-
tect against run dry.
PUMPING LIQUIDS THAT MAY SOLIDIFY OR CRYSTALLIZE
Add a flush system to the pump’s piping to prevent accumulation
of material inside the pump. Install water inlet and outlet valves
as shown in Figure 1. Refer to the “Operation” section of these
instructions for the flush procedure.
Figure 1
ELECTRICAL CONNECTIONS
1. Perform the motor wiring according to NEC requirements and
local electrical codes.
2. Wire the motor for clockwise rotation when facing the fan end
of the motor.
3. To verify correct motor rotation
a. Install the pump into your system.
b. Fully open the suction and the discharge valves.
c. Allow fluid to flow into the pump. Do not allow the pump to
run dry, as this will cause damage to the seal components.
ASSEMBLY
PUMPS WITH MOTORS
1. No assembly required. Unpack the pump and motor and exam-
ine for any signs of shipping damage. If damage is detected,
save the packaging and notify the carrier immediately.
2. Proceed to the “Installation” section of these instructions.
PUMPS WITHOUT MOTORS
Note: Do not remove shipping plug located in suction port of
the pump until the pump is completely assembled onto the
motor.
1. Unpack the pump and examine for any signs of shipping dam-
age. If damage is detected, save the packaging and notify the
carrier immediately.
Special Note: AC6HJS 90 frame only -
a. Using the hardware provided (items 9, 10, & 11), bolt
the motor adapter (item 8) to the motor.
b. Attach the mounting plate (item 14) to the motor
adapter using the hardware provided (items 12 & 13).
c. Proceed to page 2 of the Installation and Maintenance
Manual and follow steps 1 through 9 under “Reassembly.”
2. Insert key into motor keyway. Visually determine key location
in pump end. Align keyway slots on motor shaft and pump
impeller sleeve. Slide pump assembly over the motor shaft
until the pump motor adapter (item 8) is completely seated
over the motor rabbet. The drain slot should always be on
the bottom. Install 4 bolts with flat washers and lock washers
(items 9,10,11) into the motor face. Securely tighten bolts.
3. Lubricate o-ring of self-sealing bolt (item 6) with suitable,
compatible lubricant. Insert self-sealing bolt through shipping
plug and into the eye of the impeller using a 9/16” deep well
socket. Insert a screwdriver into the motor fan to prevent
motor shaft from rotating. Tighten the bolt to 12-ft lbs.
4. Remove the shipping plug from the suction port.
5. Rotate the motor fan by hand and check for impeller rubbing.
If the impeller rubs, verify that the self-sealing bolt is properly
installed.
6. Proceed to the “Installation” section of these instructions.
INSTALLATION
MOUNTING
Motor or base plate must be securely fastened.
PIPING TO AND FROM THE PUMP:
• Always support the piping near the pump to minimize
stress and strain on the pump’s casing.
AC6 & AC8 HORIZONTAL SERIES
Sealed Metallic Centrifugal Pumps
Installation and Maintenance Instructions
(12 pages)
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