Bryant 394U - Electrical Connections and Thermostat Placement; Furnace Start-Up and Pilot Flame Adjustment

ELECTRICAL CONNECTIONS
Al electrical connections are to be made in accord-
ance with the local codes governing such wiring.
Α permanent, live, separately fused electric power
supply, complete with manual Switch, should be
provided for the furnace.
The room thermostat should be located where it will
be in the natural circulating path of room air. Avoid
locations where the thermostat would be exposed to
cold air infiltration, drafts from windows, doors, or
Other openings leading to the outside; or exposure
to air currents from warm or cold air registers; or to
exposure where the natural circulation of the air is
cut off such as behind doors, above or below man-
tels, shelves, etc. (5 Ἡ .
The thermostat should not be exposed to heat from
nearby radiators, fireplaces, radios, televisions,
lamps, or rays from the sun. Nor should the thermo-
stat be mounted on.a wall containing pipes or warm
air ducts, or a flue or vent which could affect its
Operation and prevent it from properly controlling
the room temperature. Any hole in the plaster or
panel through which the wires pass from the thermo-
stat should be adequately sealed with suitable
material to prevent drafts from affecting the thermo-
stat. The heat anticipator of the. thermostat should |
be set αἱ .8 amps.
INSTALLING THE UNIT
Sizes 50, 80, 100 & 125 for natural gas are com-
pletely assembled at the factory, with the exception
of the pilot gas filter, which is shipped loose. see
Figure 6.
The order to be followed in setting the unit in place
and making all the necessary connections (gas,
electric, venting, duct work, etc.) is left to the
discretion of the installer. .
lowed. When making the gas piping installation as
For furnaces with D2 or D5 controls the pilot feed
tube is connected to the pilot relay, or the in line
100% shut-off valve.
START-UP AND ADJUSTMENT
‘Check to be sure that all connections have been:
properly made, then proceed as fellows: |
Light the pilot using the procedure outlined on the
Lighting Instruction Plate attached to the furnace.
However, when lighting the pilot for the first time,
perform the following additional steps:
l. If the supply line was not purged prior to con- ..
necting the furnace, it will be full of air. Since it
would take a long time to vent this air through the
small pilot port, it is recommended that the pilot
supply line be disconnected at the pilot shut-off
valve and the supply line be allowed to purge until
the odor of gas is detected. Never purge gas lines
into the combustion chamber. Immediately upon
detection of gas odor, re-connect the pilot supply
tube. Allow 5 minutes to elapse and light the pilot
in accordance with the instructions on the front of
the furnace.
2. The pilot flame should be soft blue in color.
a. For natural gas controls (D4) this flame should
be of sufficient length to provide good impingement
on the mono-metal element of the Bryant pilot.
Flame should extend upward between the carry-over
ports of the two adjacent burners.
b. For propane gas controls (D2), the flame
should surround the tip of the thermocouple element
of the pilot and extend downward to include 3/8 inch
to 1/2 inch of the thermocouple. The flame must
never come in contact with any other part of the
thermocouple or its lead wire. The flame lies under
the carry-over ports of the burners and merges with
the carry-over flames. D5 controls have the same
pilot and should have the same flame as D2 controls.
3. If the pilot flame does not have the appearance
described above, it may be adjusted by means of the
manual pilot shut-off valve.
a. If the valve is equipped with an adjustable
| screw, turn the handle to the full-open position and
remove the screw cap on the valve handle, thus
exposing the adjustable screw. Turn adjusting screw
until flame has the desired ως Replace
Screw cap.
b. If the valve is not equipped with the adjusting
screw, adjustment of the flame is effected by alter-
ingthe position of the valve handle.
39 41) (WM.