Manual 2100-720E
Page
5 of 42
with the Standards of the National Fire Protection
Association for the Installation of Air Conditioning and
Ventilating Systems of Other Than Residence Type,
NFPA No. 90A, and Residence Type Warm Air Heating
and Air Conditioning Systems, NFPA No. 90B. Where
local regulations are at a variance with instructions,
installer should adhere to local codes.
Duct Work
All duct work, supply and return, must be properly
sized for the design airflow requirement of the
equipment. Air Conditioning Contractors of America
(ACCA) is an excellent guide to proper sizing. All duct
work or portions thereof not in the conditioned space
should be properly insulated in order to both conserve
energy and prevent condensation or moisture damage.
Refer to Maximum ESP of Operation Electric Heat table
on page 39.
Design the duct work according to methods given by
the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should
be insulated with a minimum of 1" of insulation. Use
insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect the
duct work to the equipment in order to keep the noise
transmission to a minimum.
All model series require a 1/4" clearance to
combustible material for the first 3' of duct attached
to the outlet air frame is required. See instructions
on page 10 and Figures 14 − 18 (pages 13 – 16) for
further details.
Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture entering the
wall cavity.
Some installations may not require a return air duct. A
metallic return air grille is required with installations
not requiring a return air duct. The spacing between
louvers on the grille shall not be larger than 5/8".
Any grille that meets with 5/8" louver criteria may be
used. It is recommended that Bard Return Air Grille
Kits RG5 or RFG5 be installed when no return duct
is used. Contact distributor or factory for ordering
information. If using a return air filter grille, filters must
be of sufficient size to allow a maximum velocity of
400 fpm.
NOTE:
If no return air duct is used, applicable
installation codes may limit this cabinet to
installation only in a single story structure.
Filters
The filters can be serviced from the outside by
removing the front control panel cover (see Figure 1).
Two (2) 20" x 20" x 1" throwaway filters come standard
with each unit. Additional 1" and 2" filter options are
available as optional accessories. To be notified when
filters need changed, a dirty filter switch option is
available. See page 39 for the dirty filter switch kit.
2. Slide second filter to the left around the wires and
pull the filter out (see Figure 3 on page 6).
FIGURE 1
Front Control Panel Cover
Front
Control Panel
Cover
Filter Removal/Installation
1. Remove left filter first by pulling on filter removal
slide (see Figure 2).
FIGURE 2
Removing Left Filter
Filter Removal
Slide
