User's Manual

ADCP-75-158 • Issue 1 • July 2003 • Section 5: Maintenance

Page 5-14

5 MAINTENANCE PROCEDURES

This section specifies the system maintenance requirements and provides the procedures for the

required maintenance tasks. Refer to these procedures as needed when specified in the

Scheduled Maintenance table.

5.1 Scheduled Maintenance

Table 5-10 lists the items that require regular maintenance and the recommended maintenance

interval. Refer to the section specified in the table for the required maintenance or test

procedure.

5.2 Remote Unit Outdoor Cabinet Filter Cleaning Procedure

The RU outdoor cabinet filter cleans the RU intake air before it enters the cabinet. The filter

should be cleaned approximately once per year and more often in extremely dirty environments.

If the cabinet temperature gradually rises over a long period of time and there are no fan

failures, it is possible that the filter is dirty and requires cleaning. Use the following procedure

to clean the outdoor cabinet filter:

1. Open the RU outdoor cabinet door.

2. Loosen the two set screws that secure the filter to the bottom of the outdoor cabinet as

shown in Figure 5-1.

3. Pull the filter out and away from the bottom of the cabinet. Be careful not to damage the

foam strip that provides the air seal.

4. Gently tap the filter against your hand to dislodge any dirt or dust. If necessary, use

compressed air or a vacuum cleaner to remove dirt.

5. Carefully inspect the filter for holes or tears and replace it if damaged.

6. Orient the filter so the foam sealing strip is facing downward and then re-install the filter

in the filter mounting slot (see Figure 5-1) at the bottom of the cabinet.

7. Re-tighten the two set screws to secure the filter to cabinet

8. Close the RU outdoor cabinet door.

Table 5-10. Scheduled Maintenance

INTERVAL ITEM REQUIREMENT

12 months RU outdoor cabinet

filter*

Remove and clean the RU outdoor cabinet filters. Refer to

Section 5.2 for the required procedure.

60 months HU Fans

STM Fan

LPA Fan

Remove and replace the cooling fans in the HU, STM, and

LPA. Refer to specified section for the required procedures:

HU see Section 5.3, Section 5.4, and LPA see Section 5.5.

*Though it is not recommended that the RU be installed in a salt-air environment, if done so, clean the

cabinet filter on a monthly basis instead of on a 12 month basis. In addition, the RU should be

inspected for corrosion due to salt, particularly near the fans and around the connectors. The MTBF of

the RU may be impacted if the RU is exposed to salt-air.