OEC DAB BD-750, Installation, Operation & Service Manual

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pg. 8
7.3 Before Installation
Before installing the Blue Diver pump, make sure the impeller(s) turn freely.
• Remove the black plug (item 18) from the base of the pump (item 20), as shown in
Fig. 7.3A
• Use a flat blade screw driver to turn the impeller shaft counter clockwise (looking at
the bottom of the pump). Rotate at least one full turn. Reference Fig. 7.3B.
• Insert the black plug (item 18) back into the center hole in the base of the pump (item
20).
Fig. 7.3A Fig. 7.3B
• Make sure that the tank is free from sand, dirt, and other debris, and that its
dimensions are sufficient to fit the pump.
• The pump must be supported by metallic pipe only. Plastic or nonmetallic pipe should
not be used without a support cable. Flexible pipe installations also require the use of
stainless steel cables for pump support.
WARNING
• Do not lift or support the pump by the electric cable.
• The pump should not touch the tank bottom. It should be suspended at least 3 inches
from the tank bottom. Minimum liquid level should be no less than 6 inches above the
bottom of the pump.
• Fasten the electric cable to the delivery pipe to prevent it from getting damaged.
• To allow for thermal expansion of the discharge pipe, do not pull the power cable
tight.
• Cable extension junctions should only be made with a safe and waterproof system.
• The ground cable connection must be physically separated from the power cable
junction.
• The pump should be installed with an electric panel guaranteeing the following
functions: overload protection, short circuit protection, dry run protection.
WARNING
• The pump cannot be run dry
• Before connecting the power, check resistance on the ground.
• Single-phase motors are provided with built-in thermal overload protection with
automatic reset, and may be connected directly to the mains.
• Ensure that the metal pipes do not exert undue strain on the pump ports, thus
preventing deformations or breakages.