6
7. Piping
Use rubber sleeves or flexible joints on the inlet and/or outlet to avoid unnecessary force from the
piping to the Fan and to isolate the vibration from the Fan. If direct connection to piping is inevitable,
do not give the force to the Fan by dimensional tolerances, weight of piping, thermal expansion of
piping,etc.
8. Connection to Powerand Test run
(1) Turn thefan byhandto verify freerotationwithout rubbing ornoise.
(2) Check the belt tension and the pulley alignment referring to “12. Instruction for belt tension
Adjustingand/or beltReplacing”.
(3) Check the nameplates of Fan and motor and confirm if they agree with the specification for
power supply,then connect to powerlineunderinstruction byelectrical engineer as per electric
technical standards andwiring regulation.
(4) Jog the Fan and confirm the rotational direction is the same as the mark. If the rotational
direction is opposite, change the wiring connection. The direction can be reversed by
exchanging 2 wires of 3 wires. If the Fan runs continuously with reverse rotational direction, it
cannotperform as specifiedandmaylead toserious accident.
(5) Run the Fan and measure the electric current (average of each of 3 phases) of the motor. If it
exceeds the rated current, use at below the rated current by adjusting the air volume with
damper and so on. After running for a while,if there is no abnormal vibration or noise, test run
can be concluded. If any abnormality were found during test run, corrective action should be
takenby referring to “11. Troubleshooting”.
9. Precautions for Operation
Beforeoperating the Fan,understand thefollowingthoroughly.
(1) Continuoususeatsmallairvolumewillleadto fan durability problem.
(2) The Fan is designed to handle clean air. It cannot handle for air containing particulates and
dust, corrosive gases nor inflammable gases. Temperatures of air which standard model can
handleareinthe rangeof -15 to 50deg.C.
(3) Because the belt has initial elongation, the belt tension may decrease. The belt tension should
be checked and adjusted before operating theFan. The initial elongation practically stopsafter
a few days beginning to use the Fan.During thattime, the belt tension shouldbechecked and
adjusted everyday.
Itisnoproblemthatpowderofthebeltcomesoutuntil thebelt fitinwith thepulley.
Pay attentiontofollowingprecautionincaseofthatheatresistantmodeloperate.
(4) Donotwrap the cooling fancoverina heatinsulationmaterial.
Otherwise the life of the motor bearing may be shortened because the heat insulator material
prevents heatloss.
(5) After starting the Fan, temperature ofthe gas should be raised slowly. Otherwise the Fan may
be strainedbyheatexpansion.
(6) Whenstopping theFan,keeprunningituntil the temperatureoftheFan becomesnearly room
