NV30/NV40 Operations and Maintenance Manual Routine maintenance
Issue 3.3 2014-12-10 Page 3-3
Replacing an air filter
The transmitter contains several cotton air filters, contained in the front door and the upper and
lower rear panels. If an air filter becomes damaged, replace it as follows:
Interval
As required.
Parts and tools
•Replacement air filter
• Phillips screwdriver
Procedure
Take the following steps to replace an NV30/NV40 air filter:
1. Order a new filter or filters, as necessary. You can order a standard sized filter from Nautel
(Nautel Part # HR124) or from the manufacturer (20” x 25” x 2”, American Air Filter
PerfectPleat HC M8 MERV 8, M7 MERV 7, or equivalent) or obtain one from any local
supplier of HVAC supplies.
2. Unpack the new filter and inspect it for damage.
3. Remove the old or damaged filter (see Figure 3.1 on page 3-4) as follows:
• For a front door air filter, open the front door and - for the left-hand AUI door only -
remove the protective metal cover (six M4 screws) just above the fan filter. This allows
access to the fan filter bracket’s securing screws. Remove the filter bracket’s six M4
securing screws (left-hand door with AUI) or eight M4 securing screws (right-hand
door). Remove the air filter from the bracket.
• For rear panel filters, loosen the three quarter-turn fasteners at the right-hand side of the
appropriate filter panel. Remove the angle bracket from the right-hand side of the filter
panel and remove (slide out) the air filter.
4. Insert the new air filter into the bracket. As required, reinstall the filter bracket and protective
metal cover for the left-hand front door filter, or reinstall the angle bracket on the right-hand
side of the rear panel(s).
5. Dispose of the damaged air filter.
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