Bryant 395CAV Series - User Manual

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NOTE: Read the entire instruction manual before starting the

installation.

Index Page

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

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

PROCEDURE........................................................................2-3

Dimensional Drawing...............................................................2

Clearances From Combustible Materials.................................3

INTRODUCTION.....................................................................3

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

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

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

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

AIR FOR COMBUSTION AND VENTILATION..............4-6

Unconfined Space................................................................4

Confined Space ................................................................5-6

AIR DUCTS ..........................................................................6-7

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

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

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

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

FILTER ARRANGEMENT .....................................................6

LEVELING LEGS (IF REQUIRED).......................................7

GAS PIPING .........................................................................7-8

ELECTRICAL CONNECTIONS.............................................8

115-v Wiring........................................................................8

24-v Wiring..........................................................................8

Accessories ..........................................................................8

VENTING..............................................................................8-9

START-UP, ADJUSTMENT, AND SAFETY CHECK....9-20

General.................................................................................9

Sequence Of Operation................................................12-15

Heating Mode ....................................................................12

Cooling Mode...............................................................12-15

Continuous Blower Mode .................................................15

Continuous Blower Speed Selection from the

Thermostat....................................................................15

Heat Pump Mode...............................................................15

Start-Up Procedures...........................................................15

Adjustments..................................................................15-20

Set Gas Input Rate.......................................................15-19

Set Temperature Rise...................................................19-20

Set Thermostat Heat Anticipator ......................................20

Check Safety Controls............................................................20

Checklist..................................................................................20

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazardous due to

gas and electrical components. Only trained and qualified person-

nel 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 CAN/CGA-B149.1- and .2-M95 National

Standard of Canada, Natural Gas and Propane Installation Codes

(NSCNGPIC).

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.

Wear safety glasses and work gloves. Have 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 a hazard

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.

ama

CERTIFIED

REGISTERED QUALITY SYSTEM

installation, start-up,

and operating instructions

UPFLOW GAS-FIRED

INDUCED-COMBUSTION FURNACES

Cancels: New II 395C-40-14

1-00

395CAV

Series G

LIMITED

—1—

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Summary

Safety Considerations

Electrostatic Discharge (ESD) Precautions

Procedures to prevent damage to electronic components from static discharge during installation and servicing.

Location

General Location Requirements

Guidelines for furnace placement, including clearances and level installation.

Location Relative to Cooling Equipment

Proper placement of furnace relative to cooling coils to avoid condensation issues.

Hazardous Locations

Considerations for installing furnaces in potentially hazardous environments.

Air for Combustion and Ventilation

Unconfined Space Air Requirements

Minimum air openings required for combustion and ventilation in unconfined spaces.

Confined Space Air Requirements

Minimum air openings required for combustion and ventilation in confined spaces.

Air Ducts

General Ductwork Requirements

Design and sizing standards for the duct system.

Ductwork Acoustical Treatment

Guidelines for reducing noise transmission through ductwork.

Supply and Return Air Connections

Proper methods for connecting supply and return air ducts to the furnace.

Electrical Connections

115-v and 24-v Wiring

Instructions for connecting 115-volt and 24-volt wiring for furnace operation.

Accessory Electrical Connections

How to connect electrical accessories like humidifiers or air cleaners.

Return Air Connections

Return Air Duct Connection Guidelines

Proper methods for connecting return air ducts, avoiding the back of the furnace.

Start-Up, Adjustment, and Safety Check

General Start-Up Procedures

Initial checks and preparation before operating the furnace.

Sequence of Operation Modes

Detailed description of furnace operation in heating, cooling, and heat pump modes.

Furnace Start-up Procedures

Steps for purging gas lines, component testing, and initial furnace operation.

Adjustments and Settings

Procedures for setting gas input rate, temperature rise, and thermostat anticipator.

Safety Control Checks

Verification of primary limit, blocked vent safeguard, and pressure switches.

Installation Checklist

Final checks and cleanup after installation and start-up.

Summary

Safety Considerations

Electrostatic Discharge (ESD) Precautions

Procedures to prevent damage to electronic components from static discharge during installation and servicing.

Location

General Location Requirements

Guidelines for furnace placement, including clearances and level installation.

Location Relative to Cooling Equipment

Proper placement of furnace relative to cooling coils to avoid condensation issues.

Hazardous Locations

Considerations for installing furnaces in potentially hazardous environments.

Air for Combustion and Ventilation

Unconfined Space Air Requirements

Minimum air openings required for combustion and ventilation in unconfined spaces.

Confined Space Air Requirements

Minimum air openings required for combustion and ventilation in confined spaces.

Air Ducts

General Ductwork Requirements

Design and sizing standards for the duct system.

Ductwork Acoustical Treatment

Guidelines for reducing noise transmission through ductwork.

Supply and Return Air Connections

Proper methods for connecting supply and return air ducts to the furnace.

Electrical Connections

115-v and 24-v Wiring

Instructions for connecting 115-volt and 24-volt wiring for furnace operation.

Accessory Electrical Connections

How to connect electrical accessories like humidifiers or air cleaners.

Return Air Connections

Return Air Duct Connection Guidelines

Proper methods for connecting return air ducts, avoiding the back of the furnace.

Start-Up, Adjustment, and Safety Check

General Start-Up Procedures

Initial checks and preparation before operating the furnace.

Sequence of Operation Modes

Detailed description of furnace operation in heating, cooling, and heat pump modes.

Furnace Start-up Procedures

Steps for purging gas lines, component testing, and initial furnace operation.

Adjustments and Settings

Procedures for setting gas input rate, temperature rise, and thermostat anticipator.

Safety Control Checks

Verification of primary limit, blocked vent safeguard, and pressure switches.

Installation Checklist

Final checks and cleanup after installation and start-up.

This document outlines the installation, start-up, and operating instructions for the Bryant 395CAV Series G Limited Upflow Gas-Fired Induced-Combustion Furnaces. These furnaces are designed for indoor installation in residential buildings, including alcoves, attics, basements, closets, or utility rooms, and are certified for use with natural gas and propane. They are available in input capacities ranging from 44,000 to 154,000 Btuh.

Function Description:

The Bryant 395CAV Series G furnace is a forced-air heating unit that uses induced combustion to efficiently heat residential spaces. It is designed to operate with either natural gas or propane, requiring an accessory conversion kit for propane use. The furnace integrates with a home's ductwork system to distribute heated air. Its control system manages the sequence of operation for heating, cooling, and continuous blower modes, ensuring safe and efficient performance. The unit is equipped with safety features such as a manual reset limit switch or fuse link, a blocked vent safeguard switch, and a pressure switch to prevent overheating, flame rollout, or improper draft.

Important Technical Specifications:

Model: 395CAV Series G Limited Upflow Gas-Fired Induced-Combustion Furnaces.
Input Capacities: 44,000 to 154,000 Btuh.
Fuel Type: Natural gas (factory-shipped), convertible to propane gas with an accessory kit.
Installation: Upflow installations only, approved for combustible flooring in alcoves, attics, basements, closets, or utility rooms.
Vent Type: Approved for Type B-1 Vent, and can be vented in common with other gas-fired appliances.
Clearances to Combustibles: Minimum 1 inch from top/plenum, front, and sides (0 inches for sides if furnace is wider than 14.25 inches), 0 inches from back. Vent clearance is 6 inches for single wall vents and 1 inch for Type B-1 vents.
Electrical Requirements: 115-v, 60 Hz, single phase. Operating voltage range: 104V (minimum) to 127V (maximum). Maximum unit amps range from 5.9A to 14.4A, depending on unit size. Maximum fuse or circuit breaker amps are 15A or 20A, depending on unit size.
24-v Circuit: Contains an automotive-type, 3-amp fuse on the main control board.
Filter Information: Filters are supplied in the blower compartment. Sizes vary by furnace casing width (e.g., 16x25x1 for 14-3/16 inch casing, 24x25x1 for 24-1/2 inch casing). Filters are cleanable and can be field modified.
Gas Piping: Manifold pressure for natural gas is typically 3.2-3.8 inches water column (w.c.) for altitudes up to 2000 ft, and 2.0-3.8 inches w.c. for altitudes above 2000 ft. Gas supply pressure must not exceed 0.5 psig (14 in. w.c.) and be no less than 0.16 psig (4.5 in. w.c.).
Return-Air Temperature: Minimum continuous 60°F db, intermittent operation down to 55°F db. Maximum 85°F db.
Altitude Derate: Approved for a 4 percent derate for each 1000 ft above 2000 ft for U.S.A. installations. Canadian installations from 2000 to 4500 ft must be derated 10 percent.

Usage Features:

Control System: The furnace features an electronic control board that manages the sequence of operation for heating, cooling, and continuous blower modes. It performs self-checks and verifies safety conditions.
Thermostat Compatibility: Designed to work with single-stage and two-speed thermostats, as well as Thermidistats for enhanced humidity control. Wiring diagrams are provided for various configurations, including single-speed and two-speed air conditioners, and single-speed and two-speed heat pumps (dual fuel).
Blower Speed Selection: The blower motor speed for continuous operation can be adjusted from the room thermostat, cycling through FAN, HEAT, and COOL speeds.
Dehumidification (DHUM) Feature: When connected to a Thermidistat, the furnace can adjust blower speed to enhance dehumidification during cooling cycles.
Component Test Feature: The control board includes a component test mode that allows individual components (except the gas valve) to be run for a short period, aiding in system diagnostics.
Auxiliary Junction Box: The 115-v auxiliary junction box can be moved to the left-hand side of the furnace if a left-side power supply is desired.
Accessories: Quick-connect terminals are provided for Electronic Air Cleaner (EAC) (115-v, 1.0-amp max) and Humidifier (HUM) (24-v, 0.5-amp max).

Maintenance Features:

Filter Arrangement: The furnace is shipped with cleanable filters located in the blower compartment. Instructions are provided for side and bottom return applications, including modifications for different casing widths. Regular filter cleaning or replacement is crucial for proper operation.
Safety Control Checks: The manual emphasizes checking the primary limit control, blocked vent safeguard switch, and pressure switch during start-up and periodically. Procedures are detailed for verifying their proper function.
Gas Input Rate Adjustment: Instructions are provided for determining the correct natural gas orifice size and adjusting manifold pressure based on altitude, heating value, and specific gravity to ensure the furnace operates within ±2 percent of the rating plate input.
Temperature Rise Adjustment: The document explains how to measure and adjust the air temperature rise by modifying blower speed to ensure it falls within the specified range on the furnace rating plate.
Thermostat Heat Anticipator Setting: Guidance is given on setting the thermostat heat anticipator to match the amp draw of the electrical components in the R-W circuit, with a note for electronic thermostats to set the cycle rate for 3 cycles per hour.
Troubleshooting: The control board features an LED status indicator light that flashes rapidly if polarity is incorrect, and displays status codes for diagnostic purposes during component testing or fault conditions.
Service Training: Bryant offers packaged and classroom service training programs to enhance knowledge of the equipment, including unit familiarization, installation, maintenance, and operating sequence.