Liebert 3000 Filters, Remote Shutdown, Zone leak detection kit installation scenarios, Challenge

Component Operation and Maintenance

The zone leak detection kit provides leak detection for a defined zone. This kit is ideal for perimeter sensing or serpentine coverage of small areas. A simple, two-wire connection signals the alarms at a Liebert environmental unit or at a monitoring panel. Run wires to the Liebert unit and connect them to terminals 24 and 51, 55 or 56. The sensor utilizes Liebert's LT500Y leak detection cable. The kit is offered with five different lengths of cable sized specifically for the type of Liebert Environmental unit (see matrix below). Refer to matrix below for the recommended location of leak detection cable.

Table 16 Zone leak detection kit installation scenarios

Scenarios

Upflow Unit

Upflow Unit

Downflow Unit

Downflow Unit

Detection

Detection on sides

Detection

Detection on sides

around

and

around

and

entire unit

in front of unit

entire unit

in front of unit

2-ft clearance

2-ft clearance

in front

in front

6-ft clearance

6-ft clearance

in front

in front

Distance From Unit

Distance:

2 ft

No cable behind

1 ft

No cable behind

In back

On sides

2 ft

2 ft

1 ft

1 ft

In front

2 ft

2 ft

6 ft

6 ft

Unit

Part Number

(footprint-

in.)

Challenge

LT460-Z30

LT460-Z20

LT460-Z30

LT460-Z25

r

(32.5 x

32.5)

Remote Shutdown

A connection point is provided for customer supplied remote shutdown devices. This terminal strip is located at the top of upflow units, and at the base of downflow units. Terminals 37 and 38 on the ter- minal strip are jumpered when no remote shutdown device is installed.

6.2Filters

Filters are usually the most neglected item in an environmental control system. To maintain efficient operation, they should be checked monthly and changed as required. Because replacement intervals vary with environmental condition and filter type, each unit is equipped with a filter clog switch. This warns of restricted airflow through the filter compartment by activating the Change Filter alarm.

Turn power off before replacing filters.

Challenger 3000 filters are 28-1/2" by 29-1/2", either 2" or 4" thick, plus an optional 2" thick pre-filter. The filter is replaced from the front of the unit. On upflow units, the filter is vertical, in front of the lower compartment. Pull the filter out toward you to remove it. On downflow units, the filter is hori- zontal, above the electrical panel. Slide the filter out toward you to remove it.

After replacing the filter(s), test the operation of the filter clog switch. Turn the adjusting screw counter clockwise to trip the switch — this will energize the Change Filter alarm. To adjust the switch proceed as follows: With the fan running, set the switch to energize the light with clean filters. The unit panels must all be in place and closed to accurately find this point. Then turn the adjusting knob one turn clockwise, or to the desired filter change point.

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