Dankoff Solar SunCentric Series Manuel d'installation et d'entretien - Page 7

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Before pressing the seal parts into place, use your finger to wipe a small amount of oil or

grease onto the cast iron, rubber and shaft surfaces. This will make installation and service

much easier. DO NOT get any lubricant onto the mating white and black faces of the seal.

Always replace BOTH parts of the seal (the black part and the black & white part).

Motor Brushes: Typical brush life peak hours = working voltage X 800 / 3rd digit of model

number. EXAMPLE: PV-Direct curve #60 is Model 7526 working at 30V. Typical brush life =

30 X 800 / 2 = 12,000 peak hours. This represents about 5-8 years of service. Your result

may differ. New Brushes measure 1.25 inches (31 cm) in length. You can measure wear

after a period of time, to predict the brush life. Worn brushes will not effect performance, until

they are worn to about 1/2 inch (1 cm.). At that point, to motor will stop as contact is broken.

Replacement brushes may be obtained from your dealer or the factory.

Motor Bearings: Ball bearings in the motor are lubricated for life and do not require

maintenance. If water enters the motor accidently, it will damage the bearings. Replacement

bearings can be obtained from a local electric motor repair shop or an automotive parts

store, or from your Dankoff dealer. Purchase two bearings #6203Z.

Rubber Slinger on Shaft: A red rubber disk is mounted on the motor shaft. Its purpose is

to throw water away from the motor's front bearing if there is leakage of water due to a worn

shaft seal. Be sure that this rubber slinger rotates with the motor shaft. If it is cracked or if it

does not turn with the shaft, either replace it, or glue it to the shaft coupler using silicone

sealant or other appropriate adhesive.

Coping With Dirty Water Conditions

Water containing sand or clay will naturally cause wear. Minimize the intake of abrasives by

using the appropriate intake screen. Avoid placing the intake near the bottom of the water

source. Watch for water leaking around the shaft between the motor and the pump. When

leakage is observed or anticipated, replace the seals. See Maintenance, above.

When the impeller wears, there will be a decrease of pump performance. Wear can be seen

by inspecting the impeller. After one or more impellers have been replaced, it may also be

necessary to replace the volute case. Inspect the inside of the volute case where the intake

of the impeller runs. Look for signs of wear.

Hot Water Applications

This applies to pumps that are used to circulate fluid hotter than 140°F (60°C). Applications

include solar water heating, hydronic floor heating, etc., not swimming pools or spas. For

these applications, the SunCentric must have the "High Temperature Option". This is

indicated on the pump label by the letters "HT" after the model number. HT pumps have a

brass impeller which can be seen by looking into the intake port. They also have a high

temperature shaft seal. High temperature pumps should always have a flooded intake.

There should not be negative pressure (suction) at the intake, or hot water may vaporize

causing cavitation, noise, and reduced performance.