SPX Cooling Technologies 07-1126 user manual Operation, Prior to Start-Up, Post Start-Up

	Operation
	Prior to Start-Up
	1––Make sure all the pillow blocks are fixed to the hub boss—if any
	movement of the blocks is detected, do not operate the fan and
	check the torque of bolts 15.
	2––Rotate fan to check tip clearance is in accordance with the speci-
	fied value (tip clearance ratio x/D, where x = the distance from the
	blade tip to the fan ring and D = the rotor diameter). The gap between
	blade tip and fan ring must be measured along blade axis.
	3––Check gear box oil level or belt tension to be as indicated by
	the manufacturer.
	4––Remove all tools from the area.
	5––Connect motor to power supply.
	6––Start fan for a few seconds, and then switch it off. While the fan
	is still turning, check that the direction of the blade rotation is cor-
	rect (see Rotation and Flow Direction).
	Post Start-Up
	1––Check power absorption: if excessive, reduce the blade pitch
	angle until the desired power is achieved (set the new pitch on all
	the fans of a same structure); if lower than predicted, increase the
	blade pitch angle until the desired power is achieved (set the new
	pitch angle on all the fans of a same structure).
	Power absorption varies in inverse proportion to the air tem-
Note
	perature.
	2––Check the vibrations level in the position shown in Figure 5.
	Do not exceed the most restrictive amplitude values between the
	limits imposed by the normative of the structure where the fan is
	installed and the limits imposed by the VDI 2056 normative. In this
	case, shut down the unit and trace the cause of such excessive
	vibration by referring to section Possible Causes of Vibration in the
	following section.

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