Bryant 394 Gas - Manual

Installation Ins!
394
Series G
Size 50 thru 220
GAS-FIRED FORCED AIR FURNACE
INTRODUCTION
Before installing the furnace, refer to Bryant Form
No. 39003D1 “Procedure for Gas Appliances”
(packaged with the equipment) for information con­
cerning combustion, venting, piping, and other standard
installation practices. Further reference is made to the
current edition of the American National Standard
“Installation of Gas Appliances and Gas Piping,”
Z21.30.
Model 394 Gas Furnaces are shipped from the factory
completely assembled and wired ready for indoor heat­
ing installation. They are manufactured with two types
of blowers: belt and direct drive. The three smaller
sizes (Series G), 50, 80, and 100. are direct drive only.
All sizes incorporate a low-voltage terminal strip for
convenience of field wiring (except HL and HH
Models).
The optional equipment available includes: Counter­
flow Box; Side and Rear Drop Ducts; Side Filter
Racks; Cooling Coil Housing; Combustible Floor
Base Packages, for Counterflow Applications; Cooling
Relay Kit, for field conversion.
CAUTION:
1 ( iiimli-! i I mv liii[M,.e mus' bv ui'Killvd kii .m :ip
proved non-combustible base.
2 liL siiic icmpci.iMtii. Use ll■>l■^ no! c\».cci{ ili.i
spcs-ilhil on ihc mil! i.iimu pkiic
' lie suic to chci.l' all ci'iiiiols iiii piiipci opt-i.i'ioi
upon cvimplction of installalivm.
4 . Duralast filler on 125 and 137 iipflow fu.maces mus
be used with a skle filter rack or rear drop duct.
I. CLEARANCE REQUIREMENTS
The upflow furnace design is certified for use on com­
bustible floors.
The Model 394 design is certified by the American Gas
Association, Inc., for installation in a closet or alcove
provided the following clearances are maintained.
Sides............................................................ 0" (1")*
Back............................................................ 0" (1")*
Top of Plenum............................................. 3" (0")*
Vent Connector........................................... 6" (6")*
Front............................................................ 6" (6")*
* Figures shown in parentheses are approved clearances
when the furnace is installed as a counterflow furnace.
II. CONTROLS
Bryant Automatic Gas Control Valve
Note: On units equipped with an A-643 Bryant auto­
matic gas control valve, there are three positions for
Cancels 39394D66 39394D73
3/30/72
the manual valve knob (OFF-PILOT-ON). There is a
position stop at the PILOT position. To move the
manual valve knob from the PILOT position to either
ON or OFF position, the manual valve knob must be
depressed.
If not already checked when lighting the main burner,
check the proper operation of this valve by moving
the room thermostat pointer above and below room
temperature and observing that the main burners light
on call for heat and go off when the pointer is moved
below the room temperature setting. All Bryant auto­
matic gas control valves have a delay when opening
or closing.
Automatic Pilot
To check the pilot operation, follow the instructions
below:
Attach a low-voltage test light to electrical leads of gas
valve. With thermostat set above room temperature,
shut off gas supply to burners and pilot, with main
manual shutoff valve. If test light goes out within 45
seconds, pilot is functioning properly. If light does not
go out within 60 seconds, replace pilot.
Pilots with Thermocoupie Elements
The D2 100% shutoff propane and D5 100% shutoff
natural gas controls have pilots equipped with thermo­
couple elements.
The pilot flame should surround the tip of the thermo­
couple. It should also extend downward to include
3/8 to 1/2 inch of the thermocouple tip. The flame
must not come in contact with any other part of the
thermocouple.
D2 Propane
The thermocouple transforms heat energy from the
pilot flame into electrical energy. The current thus
generated is sufficient to operate the 100% inline shut­
off valve. The Bryant automatic gas control valve is
powered externally from the transformer, and operates
independently of the inline shut-off valve. When there