Emerson 540VDC manual Optional Air Filters, Torque Requirements, Detecting Trouble

Maintenance

7.6Optional Air Filters

The optional air filters must be inspected and serviced on a regular schedule. The period between inspections will depend upon environmental conditions. Under normal conditions, the air filters will require cleaning or replacement approximately every 12 months.

!CAUTION

Be certain recyclable filter elements are dry before reinstalling them in the Liebert FS.

Abnormal or dusty conditions will require more-frequent cleaning and replacement of air filters (sometimes as often as every two months). Inspect installations in new buildings more often, then extend the inspection period as experience dictates.

7.7Torque Requirements

All electrical connections must be tight. Table 12 provides the torque values for the connections in the Liebert FS. Use these values unless the equipment is labeled otherwise.

Table 12 Torque specifications (unless otherwise labeled)

Nut And Bolt Combinations

	Grade 2			Electrical Connections
	Standard			With Belleville Washers
Bolt Shaft Size
	Lb-in		N-m	Lb-in	N-m
1/4	53		6.0	46	5.2
5/16	107		12	60	6.8
3/8	192		22	95	11
1/2	428		48	256	29
Circuit Breakers with Compression Lugs (For Power Wiring)
Current Rating	Lb-in		N-m
250A	250		28
Circuit Breakers with Compression Lugs (For Control Wiring)
AWG Wire Size or Range	Lb-in		N-m
#22 - #14	3.5 to 5.3	0.4 to 0.6

7.8Detecting Trouble

It is important that the operator check the instrument readings if abnormal equipment performance is suspected. Any metered value that differs appreciably from normal could mean an impending mal- function and should be investigated.

Items to check include:

•Alarm messages indicate malfunction or impending malfunction. A daily check of the operator control panel will help to provide an early detection of problems. Refer to Table 16 to interpret alarm messages.

•Tracing a problem to a particular section is facilitated by alarm messages and the metered parameter indications. These are stored in the Status Reports and can be displayed at the opera- tor control panel or at an optional terminal. A Liebert Services engineer will be familiar with test points inside the unit.

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