Page 24
13. Check-Test
Start (cont'd)
Installation Instructions for Optional Screened Air Hood for
Outdoor Units (Options AS2, AS6, AS7) and Filter Sections
for Indoor Units (Options AW3, AW6)
CAUTION: It is
recommended that the
inlet to the outside air
hood NOT be facing into
prevailing wind.
ADDENDUM SECTION
recommended that the tempered makeup air entering the building be
tested at its point of discharge from the heating unit. The table below
shows limits for various substances including carbon monoxide.
Certified, portable detector tubes may be used; follow the manufacturer's
instructions.
Limits Based on Eight-Hour Exposure and a Five-Day Week (Guide Only)
Substance
Percent
PPM
Acetaldehyde
.001
1 0
Carbon Dioxide
.250
2500
Carbon Monoxide
.001
1 0
Formaldehyde
.000025
0.25
Nitrogen Dioxide
.0001
1
Sulphur Dioxide
.00005
0.5
Note: At 100°F rise the CO
2
concentration will be about 2500 ppm.
After Startup (cont'd)
DANGER: The gas burner in this direct gas-fired system is designed and equipped to provide
safe and economically controlled complete combustion. However, if the installation does not
permit the burner to receive the proper supply of combustion air, complete combustion may
not occur. The result is incomplete combustion which produces carbon monoxide, a poisonous
gas that can cause death.
Always comply with the combustion air requirements in the installation codes and operating
instructions. The amount of air over the burner must be within the specified range. The burner
profile plates are set at the factory to match CFM requirements. Do not adjust the burner
profile plates without contacting a factory representative. FAILURE TO PROVIDE PROPER
COMBUSTION AIR CAN RESULT IN A HEALTH HAZARD WHICH CAN CAUSE PROPERTY
DAMAGE, SERIOUS INJURY, AND/OR DEATH. Direct-fired installations should provide for
air changes as required by the applicable installation codes.
All of these air inlet accessories are designed to be attached directly to the
system cabinet. To prevent damage, it is recommended that the system be set
in its permanent location before installing the air hood or filter cabinet option.
All are shipped separately; installation requirements depend on the size (see
below).
See Paragraph 6 for the dimensions of these optional accessories.
Provide a minimum of 14" (356mm) clearance from the bottom of the air hood
to the mounting surface.
TABLE Identifying Options by ITEM and Application
ITEM
Options
Description
For Sizes
Installation Requirements
1
AS2, AS6,
AS7
Outdoor Screened Air Hood
with and without filters
1-20, 1-40, 1-50,
1-65, 2-80, 2-120
Factory Assembled; Field Installed -
Follow instructions on page 25.
2
AS2, AS6,
AS7
Outdoor Screened Air Hood
with and without filters
3-180, 3-260
Field Assembled and Installed -
Follow instructions pages 25 to 28.
3
AW3,
AW6
Indoor Filter Cabinet with
Filters
All
Factory Assembled; Field Installed -
Follow instructions on page 25.
