Bryant Gas Fired Forced Air 394 - Manual

Installation Instructions
GAS FIRED FORCED AIR FURNACE
394
Series F
Sizes 50 thru 220
bruant
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 Standard “Installation
of Gas Appliances and Gas Piping,” ASA Z21.30.
Model 394 Gas Furnaces are shipped from the factory
completely assembled and wired ready for indoor
upflow heating installation. They are manufactured
with two types of blowers: belt and direct drive. The
three smaller sizes (Series F), 50, 80, and 100, are
direct drive only. All sizes incorporate a low-voltage
terminal strip for convenience of field wiring.
The optional equipment available includes: Counter-
fiow Box, Side and Rear Drop Ducts; Side Filter
Racks, Cooling Coil Housing, Combustible Floor
Base Packages, for Counterfiow Applications, Cooling
Relay Kit for field conversion.
Note: Do not use Cooling Relay Kit with 3/4-HP
Blower Motor sex Drive Models.
CAUTION:
1. Counterflow furnace must be installed on an ap­
proved non-combustible base.
2. Be sure temperature rise does not exceed that
specified on the unit rating plate.
3. Be sure to check all controls for proper operation
upon completion of installation.
I. CLEARANCE REQUIREMENTS
The upflow furnace is certified for use on combustible
floors.
The furnace is certified by the American Gas Asso­
ciation, Inc., for installation in a closet or alcove
provided the following clearances from combustible
construction 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.
Cancels ^39№31
II. CONTROLS
Bryant Automatic Gas Control Valve
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 of approximately
15 to 30 seconds.
Automatic Pilot
To check the pilot operation, follow the instructions
below:
1. Set the room thermostat on call for heat. (There
is a delay before burners light.)
2. After the burners light, shut off the pilot gas valve.
3. After the pilot is out, the monometal element cools
and returns to the open position. This breaks the
circuit to the gas valve and the burners will extinguish.
Pilots with Thermocouple 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 diaphragm gas control valve
is powered externally from the transformer, and
operates independently of the inline shut-off valve.
When there is a pilot flame, the current generated by
the thermocouple holds the 100% inline shut-off valve
in the open position and the gas control valve controls
the flow of gas. Should the pilot go out, no current will