C. blower control center, Xi. startup and adjustment, B. automatic gas control valve – Bryant 376B User Manual

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room temperature. Any hole in the plaster or panel through
which the wires pass from the thermostat should be ade
quately sealed with suitable material to prevent drafts from
affecting the thermostat.

C. Blower Control Center

Each furnace features a blower control center. This will aid
the installer and serviceperson when installing and servic

ing the unit. A low-voltage terminal board is marked for

easy connection of field wiring. See Figure 14.

XI. STARTUP AND ADJUSTMENT

In addition to the following information, refer to “Proce

dures for Induced-Combustion Gas-Fired Furnaces” pack

aged with the unit.

NOTE:

The furnace blower door must be in place to complete

the 115-volt circuit to the furnace.

A. Adjustment of Blower Speed

To change motor speed taps, remove the motor tap lead. See
Table VI. and relocate it on the desired terminal on the

plug-in terminal block/speed selector located on the blower.

TABLE VI—SPEED SELECTOR

Speed

Tap No.

Common

Med-Hi

Med-Low

Low

The gas service pressure must not exceed 14 in. wc (8.1
ounces) for natural gas.

NOTE;

The gas valve regulator has been factory-set at 3.5

in. wc for natural gas. Refer to “Procedure for Induced-

Combustion Gas-Fired Furnaces” for readjusting when
checking input.

yii

- Ì-

Figure 14—Blower Control Center

B. Automatic Gas Control Valve

These units are equipped with an 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 temper

ature and observing that the main burners light on “call for

heat” (there will be a time delay) and go off when the pointer
is moving below room temperature setting.

NOTE:

For ease of adjusting the pilot flame, disconnect and

tape one power lead at the main gas valve. Disconnect ter
minal No. 1. This will pervent main burner ignition and

allow time to adjust the pilot. Reconnect the power lead
after adjustment.

XII. CARE AND MAINTENANCE

- FIELD LOW-VOLTAGE WIRING

Figure 15—Heating and Cooling Application Wiring Diagram

7S46

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