Trane AM4A0A18S11SA Series, Installation, Operation And Maintenance Manual

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CLCH-SVX07C-EN 49
Component Installation Requirements
Component Installation Requirements
The components in the air handler may have installation requirements that could affect the unit’s
performance.
Diffuser Sections
Diffuser sections are usually placed between a fan and a downstream coil or filter. Because
placement is critical to unit performance, verify the correct placement of the diffuser section before
assembling the unit (see
Figure 39 ).
Filter Sections
Bag and cartridge filter sections can be used as a pre-filter section, a final filter section, or both. This
use is determined by the filter’s placement in relation to the fan.
• A final filter is placed after the fan.
• A pre-filter is placed before the fan.
Note: Cartridge and bag filters provided by Trane are fitted with a 7/8-inch header that fits in the
filter track. If using filters supplied by another manufacturer, filters should be purchased
with a 7/8-inch header. In some cases it may be necessary to gasket other manufacturers’
filters to ensure a good air seal.
Filters should be installed when the unit is set. This will protect internal components, such as the
heating and cooling coils.
Final Filter Section
A final filter section should not be bolted directly to the face of a fan section. One or more
intermediate sections must be placed between the fan discharge and the filter section.
Pre-Filter Section
A pre-filter section has no special installation requirements unless placed directly upstream of a
plenum fan. In these configurations, ensure a blank section is placed between the fan inlet and the
filter section.
Trane recommends the use of disposable pre-filters with high-efficiency filters. Disposable pre-
filters slide into the mounting tracks just ahead of the bag/cartridge filters.
Figure 39. Diffuser placement sizes 3 to 120
Airflow