Bryant 333JAV - User Manual

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TABLE OF CONTENTS

SAFETY CONSIDERATIONS.....................................................1

INTRODUCTION..........................................................................1

CODES AND STANDARDS........................................................3

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........3

LOCATION....................................................................................4

General ......................................................................................4

Location Relative to Cooling Equipment ................................4

Hazardous Locations.................................................................4

AIR FOR COMBUSTION AND VENTILATION ......................4

Unconfined Space.....................................................................5

Confined Space.........................................................................5

Air Ducts...................................................................................6

General Requirements .........................................................6

Ductwork Acoustical Treatment .........................................6

Supply Air Connections ......................................................6

Return Air Connections.......................................................6

Filter Arrangement ..............................................................7

INSTALLATION...........................................................................7

Upflow Furnace Installation.....................................................7

Horizontal Furnace Attic Installation.......................................9

Construct a Working Platform............................................9

Install Furnace .....................................................................9

Horizontal Furnace/Crawlspace

Installation.................................................................................9

Leveling Legs (If Required For Upflow) ................................9

Gas Piping.................................................................................9

Electrical Connections ............................................................10

115-v Wiring......................................................................10

24-v Wiring........................................................................10

Accessories ........................................................................11

Venting...............................................................................11

START-UP, ADJUSTMENT, AND SAFETY CHECK ............11

General ....................................................................................11

Sequence of Operation............................................................13

Set-up Procedures ...................................................................17

Start-up Procedures.................................................................17

Adjustments.............................................................................19

Check Safety Controls............................................................25

Checklist..................................................................................25

SAFETY CONSIDERATIONS

Installation and servicing of heating equipment can be hazardous

due to gas and electrical components. Only trained and qualified

personnel should install, repair, or service heating equipment.

Untrained personnel can perform basic maintenance functions

such as cleaning and replacing air filters. All other operations must

be performed by trained service personnel. When working on

heating equipment, observe precautions in the literature, on tags,

and on labels attached to or shipped with the unit and other safety

precautions that may apply.

Follow all safety codes. In the United States, follow all safety

codes including the National Fuel Gas Code (NFGC) NFPA

54-1999/ANSI Z223.1-1999 and the Installation Standards, Warm

Air Heating and Air Conditioning Systems (NFPA 90B)

ANSI/NFPA 90B. In Canada, refer to the current edition of the

CAN/CGA-B149.1- and .2-M00 National Standard of Canada,

Natural Gas and Propane Installation Codes (NSCNGPIC). Wear

safety glasses and work gloves. Have a fire extinguisher available

during start-up and adjustment procedures and service calls.

Recognize safety information. This is the safety-alert symbol

When you see this symbol on the furnace and in instructions or

manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION,

and NOTE. These words are used with the safety-alert symbol.

DANGER identifies the most serious hazards which will result in

severe personal injury or death. WARNING signifies hazards

which could result in personal injury or death. CAUTION is used

to identify unsafe practices which would result in minor personal

injury or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability,

or operation.

These instructions cover minimum requirements and conform to

existing national standards and safety codes. In some instances,

these instructions exceed certain local codes and ordinances,

especially those that may not have kept up with changing residen-

tial construction practices. We require these instructions as a

minimum for a safe installation.

INTRODUCTION

The models 333BAV and 333JAV Series D furnaces are available

in sizes 60,000 through 117,000 Btuh input capacities. These

furnaces use variable-speed motors manufactured by General

Electric (GE) and known as ICM2+ motors. They are integrated

control motors, which include a pre-programmed micro-processor-

based control to precisely control the selected airflow rates. The

motor will be referred to as ICM2+ in the rest of this document.

The design of the upflow/horizontal gas-fired furnace is C.S.A.

(A.G.A. and C.G.A.) design-certified for use with natural and

propane gases and for installation on combustible wood flooring,

REGISTERED QUALITY SYSTEM

EFFICIENCY

RATING

CERTIFIED

installation, start-up,

and operating instructions

UPFLOW/ HORIZONTAL

TWO-STAGE, VARIABLE SPEED

GAS FURNACE

Cancels: II 333B-60-5 II 333B-60-6

9-01

333BAV

333JAV

Series D

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Main Page

Other manuals for Bryant 333JAV

Service And Maintenance Procedures12 pages

Questions and Answers

M
Maria DanielsAug 5, 2025
What to do if Bryant 333JAV control displays rapid flashing on the status LED?
- B
  butlerhaileyAug 6, 2025
  If your Bryant Furnace's control is showing a rapid flashing status LED and stopping heat operation, the issue might be incorrect polarity. To resolve this, check the field wiring information in Figures 7 and 8, and the furnace wiring information in Figure 9.

The Bryant 333BAV and 333JAV Series D furnaces are upflow/horizontal two-stage, variable-speed gas furnaces designed for indoor installation in residential settings such as alcoves, attics, basements, closets, crawlspaces, or utility rooms. These furnaces are not certified for installation in mobile homes, recreation vehicles, or outdoors.

Function Description:

These furnaces provide heating for residential spaces. They utilize variable-speed ICM2+ motors manufactured by General Electric (GE), which incorporate a pre-programmed microprocessor-based control to precisely manage selected airflow rates. The two-stage heating capability allows for more efficient operation by matching the heat output to the actual demand, while the variable-speed blower enhances comfort and efficiency. The furnace control unit (CPU) manages the entire heating cycle, including inducer motor operation, igniter warm-up, gas valve activation, flame proving, and blower operation, with built-in delays for optimal performance and safety.

Important Technical Specifications:

Input Capacities: Available in sizes ranging from 60,000 to 117,000 Btuh.
Motor Type: Variable-speed ICM2+ motors (integrated control motors).
Gas Type: Design-certified for use with natural and propane gases.
Electrical Requirements: 115-v power supply, 60 Hz, single phase. Refer to Table 5 for specific unit size electrical data, including maximum unit amps, minimum wire gage, maximum wire length, and maximum fuse or circuit breaker amps.
Return-Air Temperature Limits: Minimum continuous return-air temperature of 60°F (15.5°C) or intermittent operation down to 55°F (12.8°C). Maximum return-air temperature of 85°F (29.4°C).
Gas Service Pressure: Must not exceed 0.5 psig (14-in. wc) and no less than 0.16 psig (4.5-in. wc).
Clearances to Combustibles: Refer to Fig. 3 for detailed clearances. Generally, 1-inch clearance to top/plenum, back, and bottom, 0-inch to sides, 7-inch to front, and 18-inch front clearance for alcoves. Vent clearances are 6 inches for single wall vents and 1 inch for Type B-1 vents.
Airflow: The ICM2+ motor speeds are infinitely variable from 300 to 1400 rpm and dynamically controlled to precisely control airflow rate (CFM). Ramp-up and ramp-down times are controlled to reduce noise perception.
Filter Information: Refer to Table 3 for filter sizes based on furnace casing width, for both side and bottom return applications. Factory-supplied washable filters are shipped in the blower compartment.
High-Altitude Operation: Requires a high-altitude conversion kit for installations above 5,500 ft (1,675 m). Gas input derating is required for altitudes above 2000 ft in the U.S.A. (4% per 1000 ft) and 2000 to 4500 ft in Canada (10%). Refer to Table 11 for orifice size and manifold pressure adjustments based on altitude, average gas heat value, and specific gravity.

Usage Features:

Installation Flexibility: Can be installed in upflow or horizontal configurations (left-hand or right-hand side down for horizontal).
Adaptive Heating Mode: For single-stage thermostats, the furnace control CPU uses an adaptive sequence to select low- or high-gas heat operation based on the stored history of previous heating cycles, optimizing comfort and efficiency.
Two-Stage Thermostat Compatibility: Allows a 2-stage thermostat to directly control low- and high-gas heating modes.
Cooling and Heat Pump Modes: Supports single-speed and two-speed cooling outdoor units and single-speed and two-speed heat pumps, with specific airflow adjustments for efficiency (HP-EFFY) or comfort (HP-CMFT).
Continuous-Fan Operation: Provides selectable continuous-fan airflow rates (LO, MED, HI) at 50%, 65%, or 100% of single-speed cooling airflow.
Dehumidification Feature: Can be enhanced with a field-supplied humidistat to reduce cooling airflow by 20% (down to 280 CFM per ton limit) for better dehumidification.
Diagnostic LED: A status code label on the blower compartment door explains how to use the LED status indicator on the furnace control for troubleshooting.
Component Test System: A built-in component test system helps diagnose system problems by sequentially operating the inducer motor, igniter, and blower motor.

Maintenance Features:

Filter Access: Filters can be installed in an external Filter/Media cabinet or the furnace blower compartment. Factory-supplied washable filters are included. Regular filter maintenance is crucial for proper airflow and unit operation.
Gas Input Rate Adjustment: Manifold pressure for both high- and low-stage heat can be adjusted using screws on the gas control regulators to ensure correct input rate based on local gas supply characteristics and altitude.
Air Temperature Rise Adjustment: The air temperature rise can be adjusted by moving jumper wires on the airflow selector control (RED jumper wire for high and low heat) to match the specified range on the unit rating plate.
Safety Control Checks: Includes procedures to check the primary limit control, draft safeguard switch, and flow-sensing pressure switches to ensure safe operation.
Electrical Connections: Features a 3-amp fuse on the main control for the 24-v circuit, which should only be replaced with a 3-amp fuse if it blows.
ESD Precautions: Specific instructions are provided to prevent electrostatic discharge damage to electronic components during installation and servicing.
Regular Servicing: Emphasizes that installation and servicing should only be performed by trained and qualified personnel due to the presence of gas and electrical components. Untrained personnel are limited to basic maintenance like cleaning and replacing air filters.