4
441 01 2121 01
Figure 2 − Clearances to Combustibles
INTRODUCTION
F8MVL & G8MVL 4−way multipoise Category I fan−assisted
furnace is CSA (formerly A.G.A. and C.G.A.) design−certified.
A Category I fan−assisted furnace is an appliance equipped
with an integral mechanical means to either draw or force
products of combustion through the combustion chamber
and/or heat exchanger. The furnace is factory−shipped for
use with natural gas. This furnace is not approved for
installation in mobile homes, recreational vehicles, or
outdoors.
Figure 3 − Return Air Temperature
A06745
80F/27C
60F/16C
This furnace is designed for minimum continuous return−air
temperature of 60F (15C) db or intermittent operation down
to 55F (13C)db such as when used with a night setback
thermostat. Return−air temperature must not exceed 80F
(27C) db. Failure to follow these return−air temperature limits
may affect reliability of heat exchangers, motors, and
controls. (See Figure 3)
For accessory installation details, refer to the applicable
instruction literature.
NOTE: Remove all shipping brackets and materials before
operating the furnace.
CODES AND STANDARDS
Follow all national and local codes and standards in
addition to these instructions. The installation must comply
with regulations of the serving gas supplier, local building,
heating, plumbing, and other codes. In absence of local
codes, the installation must comply with the national codes
listed below and all authorities having jurisdiction.
In the United States, follow all codes and standards for the
following:
Safety
NFPA 54/ANSI Z223.1−2009 and the Installation Standards,
Warm Air Heating and Air Conditioning Systems ANSI/NFPA
90B .
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