Bryant GAS-FIRED INDUCED-COMBUSTION FURNACES 383KAV Installation, Start-Up, And Operating Instructions Manual Download

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IX.

VENTING

Refer to the national or local installation code such as NFGC in the
United States, or the NSCNGPIC in Canada for proper vent sizing
and installation requirements. Use the enclosed Installation In-
structions (Single-Stage Vent Tables for Category I Fan-Assisted
Furnaces) for a quick, easy reference.
After fully assembling the vent connector to the furnace flue collar,
securely fasten the vent connector to the collar with two field-
supplied, corrosion-resistant, sheet metal screws located 180° apart
and midway up the collar.
The horizontal portion of the venting system shall maintain a
minimum of 1/4-in. upward slope per linear ft and it shall be
rigidly supported every 5 ft or less with hangers or straps to ensure
that there will be no movement after installation.

START-UP, ADJUSTMENT, AND SAFETY CHECK

General

NOTE:

Proper polarity must be maintained for 115-v wiring. If

polarity is incorrect, control status indicator light will flash rapidly
and furnace will not operate.

The furnace must have a 115-v power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. Thermostat wire connections at R, W, C, and Y must be
made at the furnace 24-v terminal block on the control. The gas
service pressure must not exceed 0.5 psig (14-in. wc), but must be
no less than 0.16 psig (4.5-in. wc).

CAUTION:

This furnace is equipped with a manual

reset limit switch or fuse link in the gas control area. The
switch or fuse link opens and shuts off power to the gas
valve if a flame rollout or overheating condition occurs in
the gas control area. DO NOT bypass the switch. Correct
inadequate combustion air supply problem and reset the
switch or replace the fuse link.

Before operating the furnace, check each manual reset switch for
continuity. If necessary, press the button to reset the switch.
The blower compartment door must be in place to complete the
115-v circuit to the furnace.

Sequence of Operation

CAUTION:

Furnace control must be grounded for

proper operation, or control will lockout. Control is
grounded through green wire routed to gas valve and
burner bracket screw.

Using the schematic diagram shown in Fig. 11, follow the
sequence of operation through the different modes. Read and
follow the wiring diagram very carefully.

NOTE:

If there is a power interruption and any thermostat call,

the control initiates a 90-sec blower only on period before starting
another cycle.

1. Heating mode

When wall thermostat "calls for heat," R-W circuit closes.
The furnace control performs a self-check, verifies pressure
switch contacts are open, and starts inducer motor.

Fig. 10—Furnace Control

A99255

HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX)

LED OPERATION &
DIAGNOSTIC LIGHT

HARNESS CONNECTOR

24-V TRANSFORMER SEC-2

SPARE-1

SPARE-2

EAC-1

EAC-ELECTRONIC AIR CLEANER
TERMINALS (115-VAC 1.0 AMP MAX)

EAC-2

115-VAC (L2) NEUTRAL
CONNECTION