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Service Reference Manual INSTALLATION
6-13
SRM-HW/HWC 8/99
inside the unit. Make sure that all sides of the duct are flanged over to
permit removal of the cooling chassis if required. Use a flexible connec-
tion to attach the remainder of the return duct. The return duct should be
sealed to the unit casing and terminate outside the space containing the
furnace.
Air Filter
All indoor return air must be filtered. A permanent-type filter is furnished
with the unit, located directly behind the access panel. Removing the
panel permits access to the filter.
If an installation is made in which it is more desirable to mount the filter
exterior to the unit, in the return duct work or elsewhere, the permanent
filter can be used or replaced with a disposable filter. If a disposable filter
is used, refer to Table 6-4 when sizing the disposable filter.
TABLE 6-4 Minimum Required Surface Area for Disposable
Filters
Adjustments - Heating Section
Temperature Rise
At the time of installation, the temperature rise must be adjusted to be
within the range specified on the unit rating plate.
Pressure Regulator
The gas input must not exceed the figures shown on the rating plate. The
unit is equipped for rated inputs with manifold pressures of: 3.5" W.C. for
natural gas and 10.0" W.C. for propane.
The manifold pressure can be measured by removing the pipe plug in the
automatic gas valve. Connect a water manometer and measure the
pressure.
Only small variations in gas input may be made by adjusting the regulator.
In no case should the final manifold pressure vary more than 0.3"
W.C. for natural gas or 0.7" W.C. for propane.
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