Bryant Gas Fired Forced Air 394 - Manual (Page 4)

TO HEATINQ AND I
COOLING CONNECTIONS
VOF THERMOSTAT
( P/N 34427D030 I
34427D03Ì
TO CONDENSER
CONTACTOR COIL
CONNECTIONS
Figure 2 - Control Box, Cover Removed,
No Internal Wiring Changes
TO HEATINS AND
COOLING CONNECTIONS
^OF THERMOSTAT
' P/N 34427D030
a 344270031
-, ' TO CONDENSER
- I LOW VOLTAGE
■ " ' — A L E A D OR
^ J TERMINAL STRIP
NOTE^
WIRE WITH* IN FIGURE 2 IS
REMOVED AND DISCARDED WHEN
CONDENSER HAS TRANSFORMER.
Figure 3 - Control Box, Cover Removed,
Showing Internal Wiring Changes
Low-Voltage Wiring
Field low-voltage connections are made at the low-
voltage terminal strip. See Figure 6 for heating only.
For Model 394 Furnaces used in conjunction with
electric or gas air conditioning units that do not have
an integral transformer, see Figure 2. If the 394 Fur­
nace is used in conjunction with an electric or gas air
conditioning unit having an integral transformer, see
Figure 3.
Figure 3 shows a field-installed wire running from
one side of the air conditioning transformer, through
the hole marked “F” in the terminal strip to the blower
relay in the control box for the Model 394 Furnace.
The wire marked * in Figure 2 is removed from the
control box and discarded.
Limit Control
This control shuts off the gas and energizes the blower
motor if the furnace becomes overheated.
The recommended method of checking the limit control
is to gradually block oif the return air after the furnace
has been operating for a period of at least five minutes.
As soon as the limit has proven safe, the return air
opening would be unblocked to permit normal air
circulation. By using this method to check the limit
control, it can be established that the limit is function­
ing properly and will “fail-safe” if there is a motor
failure.
Thermostat Location
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 ex­
posure where the natural circulation of the air is cut
off—such as behind doors, above or below mantels,
shelves, etc.
The thermostat should not be exposed to heat from
nearby radiators, fireplaces, radios, televisions, lamps,
or rays from the sun. Nor should the thermostat 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 tempera­
ture. Any hole in the plaster or panel through which
the wires pass from the thermostat should be adequately
sealed with suitable material to prevent drafts from
affecting the thermostat.
The heat anticipator on the thermostat should be set
at 0.8 amps.
III. ELECTRICAL CONNECTIONS
Line-Voltage Wiring
All electrical connections are to be made in accordance
with the local electrical codes. A permanent, live,
separately fused electric power supply, complete with
manual switch, should be provided for the furnace.
Field wiring connections should be made in accordance
with the internal wiring as shown in Figure 6; select
the appropriate combination of diagrams to match the
equipment being used.
>41 39394D41