6 REGULAR AND PREVENTIVE MAINTENANCE
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply
disconnect switches, verify with a voltmeter that power is Off and wear appropriate,
OSHA-approved personal protective equipment (PPE) per NFPA 70E before working with the
unit. Failure to comply can cause serious injury or death. Before proceeding maintenance or
service, read all instructions. The unit controller does not isolate power from the unit, even in
the “Unit Off” mode. Some internal components require and receive power even during the
“Unit Off” mode of the controller. An electric-insulation switch on the unit allows safe
installation and service in the unit.
Regular, periodic maintenance is critical to the live and reliability of the VRC. Refer to the following
procedures for the steps to follow when completing the Preventive Maintenance Checklist on page37.
Print the Preventive Maintenance Checklist on page37, and mark each item as the maintenance is
completed.
6.1 Cleaning and Replacing the Filters
Use this procedure when the regular maintenance inspection or the "replace filter" alarm indicate that it is
time to service the filter.
To replace the evaporator filter:
1. Remove the brackets holding the filter by removing the 4 M4x10 screws, see Figure 6.1 on the
next page. Set the screws aside for re-installation.
2. Remove the filter and discard.
3. Install the replacement filter, then secure the brackets with the screws removed in Step 1.
6 Regular and Preventive Maintenance
29
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