Bryant Gas Air 393U - Manual

Installation Instructions
393U
Series D
GAS FIRED FORCED AIR FURi^ACE
The Bryant Model 393 forced air, gas-fired furnace
may be installed as an
1.
2 .
Upflow Furnace
Counter-Flow Furnace
(except sizes 175 and 200)
Basement Furnace
This instruction contains complete procedures for
installing the unit as an Upflow Furnace.
INSPECTION
I
39393D2
Rev. 3/17/65
When the furnace is used as a counter-flow, a
counter-flow box and instructions are provided.
When it is used as a basement model, a drop duct
and instructions are provided. The Series C and D
Counter-Flow Boxes are interchangeable.
Before beginning installation, read these instruc­
tions carefully.
When making a Counter-Flow or Basement installa­
tion, also read the separate instructions furnished
with the additional equipment required.
install the furnace in accordance with the require­
ments of the local utility or authority having juris­
diction.
The installer is referred to the American Standard
“Installation of Gas Appliances and Gas Piping,”
ASA Z21.30-1964, as a sound and practical guide
to be followed when making the installation.
Check the power supply available to be sure it
agrees with the information on the wiring diagram
and the blower motor in the furnace.
Check the gas specification on the A.G.A. rating
plate to be sure that the type of gas for which the
unit is equipped is the same as the gas supply
available.
/1 \ f r
" i K J V f l
Model 393 Furnace
FILTERS
When the furnace air distribution system is used for
cooling, it is recommended in certain instances that
the throw-away filters be discarded and the perma­
nent type, multi-velocity filters be substituted. The
following table gives the air flows above which
these high velocity filters should be used.
Size Air Flow - cfm
80 800
100 1000
125 1240
150 1490
175 1800
200 1800
Leave these instructions on or near the furnace. Permanent filters are not required on Size 50.